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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cell</span>::<span class="ident">RefCell</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashSet</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">rc</span>::<span class="ident">Rc</span>;

<span class="kw">use</span> <span class="ident">stretch</span>::<span class="ident">geometry</span>::<span class="ident">Size</span>;
<span class="kw">use</span> <span class="ident">stretch</span>::<span class="ident">node</span>::{<span class="ident">Node</span>, <span class="ident">Stretch</span>};
<span class="kw">use</span> <span class="ident">stretch</span>::<span class="ident">number</span>::<span class="ident">Number</span>;
<span class="kw">use</span> <span class="ident">stretch</span>::<span class="ident">style</span>::{<span class="ident">Dimension</span>, <span class="ident">Style</span>};

<span class="kw">use</span> <span class="ident">geom</span>::{<span class="ident">Percent</span>, <span class="ident">Polygon</span>};

<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">widgets</span>::<span class="ident">slider</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">widgets</span>::<span class="ident">spinner</span>::<span class="ident">SpinnerValue</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">widgets</span>::<span class="ident">Container</span>;
<span class="kw">use</span> <span class="kw">crate</span>::{
    <span class="ident">Autocomplete</span>, <span class="ident">Button</span>, <span class="ident">Color</span>, <span class="ident">Dropdown</span>, <span class="ident">EventCtx</span>, <span class="ident">GfxCtx</span>, <span class="ident">HorizontalAlignment</span>, <span class="ident">Menu</span>, <span class="ident">Outcome</span>,
    <span class="ident">PersistentSplit</span>, <span class="ident">ScreenDims</span>, <span class="ident">ScreenPt</span>, <span class="ident">ScreenRectangle</span>, <span class="ident">Slider</span>, <span class="ident">Spinner</span>, <span class="ident">Stash</span>, <span class="ident">TextBox</span>,
    <span class="ident">Toggle</span>, <span class="ident">VerticalAlignment</span>, <span class="ident">Widget</span>, <span class="ident">WidgetImpl</span>, <span class="ident">WidgetOutput</span>,
};

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Panel</span> {
    <span class="ident">top_level</span>: <span class="ident">Widget</span>,
    <span class="comment">// (layout, root_dims)</span>
    <span class="ident">cached_flexbox</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">Stretch</span>, <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Node</span><span class="op">&gt;</span>, <span class="ident">ScreenDims</span>)<span class="op">&gt;</span>,
    <span class="ident">horiz</span>: <span class="ident">HorizontalAlignment</span>,
    <span class="ident">vert</span>: <span class="ident">VerticalAlignment</span>,
    <span class="ident">dims</span>: <span class="ident">Dims</span>,

    <span class="ident">scrollable_x</span>: <span class="ident">bool</span>,
    <span class="ident">scrollable_y</span>: <span class="ident">bool</span>,
    <span class="ident">contents_dims</span>: <span class="ident">ScreenDims</span>,
    <span class="ident">container_dims</span>: <span class="ident">ScreenDims</span>,
    <span class="ident">clip_rect</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">ScreenRectangle</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span> <span class="ident">Panel</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_builder</span>(<span class="ident">top_level</span>: <span class="ident">Widget</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">PanelBuilder</span> {
        <span class="ident">PanelBuilder</span> {
            <span class="ident">top_level</span>,
            <span class="ident">horiz</span>: <span class="ident">HorizontalAlignment</span>::<span class="ident">Center</span>,
            <span class="ident">vert</span>: <span class="ident">VerticalAlignment</span>::<span class="ident">Center</span>,
            <span class="ident">dims</span>: <span class="ident">Dims</span>::<span class="ident">MaxPercent</span>(<span class="ident">Percent</span>::<span class="ident">int</span>(<span class="number">100</span>), <span class="ident">Percent</span>::<span class="ident">int</span>(<span class="number">100</span>)),
        }
    }

    <span class="doccomment">/// Returns an empty panel. `event` and `draw` will have no effect.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">empty</span>(<span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Panel</span> {
        <span class="ident">Panel</span>::<span class="ident">new_builder</span>(<span class="ident">Widget</span>::<span class="ident">col</span>(<span class="macro">vec</span><span class="macro">!</span>[])).<span class="ident">build_custom</span>(<span class="ident">ctx</span>)
    }

    <span class="kw">fn</span> <span class="ident">update_container_dims_for_canvas_dims</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">canvas_dims</span>: <span class="ident">ScreenDims</span>) {
        <span class="kw">let</span> <span class="ident">new_container_dims</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">dims</span> {
            <span class="ident">Dims</span>::<span class="ident">MaxPercent</span>(<span class="ident">w</span>, <span class="ident">h</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">ScreenDims</span>::<span class="ident">new</span>(
                <span class="self">self</span>.<span class="ident">contents_dims</span>.<span class="ident">width</span>.<span class="ident">min</span>(<span class="ident">w</span>.<span class="ident">inner</span>() <span class="op">*</span> <span class="ident">canvas_dims</span>.<span class="ident">width</span>),
                <span class="self">self</span>.<span class="ident">contents_dims</span>
                    .<span class="ident">height</span>
                    .<span class="ident">min</span>(<span class="ident">h</span>.<span class="ident">inner</span>() <span class="op">*</span> <span class="ident">canvas_dims</span>.<span class="ident">height</span>),
            ),
            <span class="ident">Dims</span>::<span class="ident">ExactPercent</span>(<span class="ident">w</span>, <span class="ident">h</span>) <span class="op">=</span><span class="op">&gt;</span> {
                <span class="ident">ScreenDims</span>::<span class="ident">new</span>(<span class="ident">w</span> <span class="op">*</span> <span class="ident">canvas_dims</span>.<span class="ident">width</span>, <span class="ident">h</span> <span class="op">*</span> <span class="ident">canvas_dims</span>.<span class="ident">height</span>)
            }
            <span class="ident">Dims</span>::<span class="ident">ExactSize</span>(<span class="ident">dims</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">dims</span>,
            <span class="ident">Dims</span>::<span class="ident">ExactHeight</span>(<span class="ident">h</span>) <span class="op">=</span><span class="op">&gt;</span> {
                <span class="ident">ScreenDims</span>::<span class="ident">new</span>(<span class="self">self</span>.<span class="ident">contents_dims</span>.<span class="ident">width</span>.<span class="ident">min</span>(<span class="ident">canvas_dims</span>.<span class="ident">width</span>), <span class="ident">h</span>)
            }
        };
        <span class="self">self</span>.<span class="ident">container_dims</span> <span class="op">=</span> <span class="ident">new_container_dims</span>;
    }

    <span class="kw">fn</span> <span class="ident">recompute_scrollbar_layout</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="ident">EventCtx</span>) {
        <span class="kw">let</span> <span class="ident">old_scrollable_x</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">scrollable_x</span>;
        <span class="kw">let</span> <span class="ident">old_scrollable_y</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">scrollable_y</span>;
        <span class="kw">let</span> <span class="ident">old_scroll_offset</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">scroll_offset</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">was_dragging_x</span> <span class="op">=</span> <span class="bool-val">false</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">was_dragging_y</span> <span class="op">=</span> <span class="bool-val">false</span>;

        <span class="self">self</span>.<span class="ident">scrollable_x</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">contents_dims</span>.<span class="ident">width</span> <span class="op">&gt;</span> <span class="self">self</span>.<span class="ident">container_dims</span>.<span class="ident">width</span>;
        <span class="self">self</span>.<span class="ident">scrollable_y</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">contents_dims</span>.<span class="ident">height</span> <span class="op">&gt;</span> <span class="self">self</span>.<span class="ident">container_dims</span>.<span class="ident">height</span>;

        <span class="comment">// Unwrap the main widget from any scrollable containers if necessary.</span>
        <span class="kw">if</span> <span class="ident">old_scrollable_y</span> {
            <span class="kw">let</span> <span class="ident">container</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">widget</span>.<span class="ident">downcast_mut</span>::<span class="op">&lt;</span><span class="ident">Container</span><span class="op">&gt;</span>().<span class="ident">unwrap</span>();
            <span class="ident">was_dragging_y</span> <span class="op">=</span> <span class="ident">container</span>.<span class="ident">members</span>[<span class="number">1</span>]
                .<span class="ident">widget</span>
                .<span class="ident">downcast_ref</span>::<span class="op">&lt;</span><span class="ident">Slider</span><span class="op">&gt;</span>()
                .<span class="ident">unwrap</span>()
                .<span class="ident">dragging</span>;
            <span class="self">self</span>.<span class="ident">top_level</span> <span class="op">=</span> <span class="ident">container</span>.<span class="ident">members</span>.<span class="ident">remove</span>(<span class="number">0</span>);
        }

        <span class="kw">if</span> <span class="ident">old_scrollable_x</span> {
            <span class="kw">let</span> <span class="ident">container</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">widget</span>.<span class="ident">downcast_mut</span>::<span class="op">&lt;</span><span class="ident">Container</span><span class="op">&gt;</span>().<span class="ident">unwrap</span>();
            <span class="ident">was_dragging_x</span> <span class="op">=</span> <span class="ident">container</span>.<span class="ident">members</span>[<span class="number">1</span>]
                .<span class="ident">widget</span>
                .<span class="ident">downcast_ref</span>::<span class="op">&lt;</span><span class="ident">Slider</span><span class="op">&gt;</span>()
                .<span class="ident">unwrap</span>()
                .<span class="ident">dragging</span>;
            <span class="self">self</span>.<span class="ident">top_level</span> <span class="op">=</span> <span class="ident">container</span>.<span class="ident">members</span>.<span class="ident">remove</span>(<span class="number">0</span>);
        }

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">container_dims</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">container_dims</span>;
        <span class="comment">// TODO Handle making room for a horizontal scrollbar on the bottom. The equivalent change</span>
        <span class="comment">// to container_dims.height doesn&#39;t work as expected.</span>
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">scrollable_y</span> {
            <span class="ident">container_dims</span>.<span class="ident">width</span> <span class="op">+</span><span class="op">=</span> <span class="ident">slider</span>::<span class="ident">SCROLLBAR_BG_WIDTH</span>;
        }
        <span class="kw">let</span> <span class="ident">top_left</span> <span class="op">=</span> <span class="ident">ctx</span>
            .<span class="ident">canvas</span>
            .<span class="ident">align_window</span>(<span class="ident">container_dims</span>, <span class="self">self</span>.<span class="ident">horiz</span>, <span class="self">self</span>.<span class="ident">vert</span>);

        <span class="comment">// Wrap the main widget in scrollable containers if necessary.</span>
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">scrollable_x</span> {
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">slider</span> <span class="op">=</span> <span class="ident">Slider</span>::<span class="ident">horizontal</span>(
                <span class="ident">ctx</span>,
                <span class="self">self</span>.<span class="ident">container_dims</span>.<span class="ident">width</span>,
                <span class="self">self</span>.<span class="ident">container_dims</span>.<span class="ident">width</span> <span class="op">*</span> (<span class="self">self</span>.<span class="ident">container_dims</span>.<span class="ident">width</span> <span class="op">/</span> <span class="self">self</span>.<span class="ident">contents_dims</span>.<span class="ident">width</span>),
                <span class="number">0.0</span>,
            )
            .<span class="ident">named</span>(<span class="string">&quot;horiz scrollbar&quot;</span>)
            .<span class="ident">abs</span>(<span class="ident">top_left</span>.<span class="ident">x</span>, <span class="ident">top_left</span>.<span class="ident">y</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">container_dims</span>.<span class="ident">height</span>);
            <span class="comment">// We constantly destroy and recreate the scrollbar slider while dragging it. Preserve</span>
            <span class="comment">// the dragging property, so we can keep dragging it.</span>
            <span class="kw">if</span> <span class="ident">was_dragging_x</span> {
                <span class="ident">slider</span>.<span class="ident">widget</span>.<span class="ident">downcast_mut</span>::<span class="op">&lt;</span><span class="ident">Slider</span><span class="op">&gt;</span>().<span class="ident">unwrap</span>().<span class="ident">dragging</span> <span class="op">=</span> <span class="bool-val">true</span>;
            }

            <span class="kw">let</span> <span class="ident">old_top_level</span> <span class="op">=</span> <span class="ident">std</span>::<span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">top_level</span>, <span class="ident">Widget</span>::<span class="ident">nothing</span>());
            <span class="self">self</span>.<span class="ident">top_level</span> <span class="op">=</span> <span class="ident">Widget</span>::<span class="ident">custom_col</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">old_top_level</span>, <span class="ident">slider</span>]);
        }

        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">scrollable_y</span> {
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">slider</span> <span class="op">=</span> <span class="ident">Slider</span>::<span class="ident">vertical</span>(
                <span class="ident">ctx</span>,
                <span class="self">self</span>.<span class="ident">container_dims</span>.<span class="ident">height</span>,
                <span class="self">self</span>.<span class="ident">container_dims</span>.<span class="ident">height</span>
                    <span class="op">*</span> (<span class="self">self</span>.<span class="ident">container_dims</span>.<span class="ident">height</span> <span class="op">/</span> <span class="self">self</span>.<span class="ident">contents_dims</span>.<span class="ident">height</span>),
                <span class="number">0.0</span>,
            )
            .<span class="ident">named</span>(<span class="string">&quot;vert scrollbar&quot;</span>)
            .<span class="ident">abs</span>(<span class="ident">top_left</span>.<span class="ident">x</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">container_dims</span>.<span class="ident">width</span>, <span class="ident">top_left</span>.<span class="ident">y</span>);
            <span class="kw">if</span> <span class="ident">was_dragging_y</span> {
                <span class="ident">slider</span>.<span class="ident">widget</span>.<span class="ident">downcast_mut</span>::<span class="op">&lt;</span><span class="ident">Slider</span><span class="op">&gt;</span>().<span class="ident">unwrap</span>().<span class="ident">dragging</span> <span class="op">=</span> <span class="bool-val">true</span>;
            }

            <span class="kw">let</span> <span class="ident">old_top_level</span> <span class="op">=</span> <span class="ident">std</span>::<span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">top_level</span>, <span class="ident">Widget</span>::<span class="ident">nothing</span>());
            <span class="self">self</span>.<span class="ident">top_level</span> <span class="op">=</span> <span class="ident">Widget</span>::<span class="ident">custom_row</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">old_top_level</span>, <span class="ident">slider</span>]);
        }

        <span class="self">self</span>.<span class="ident">update_scroll_sliders</span>(<span class="ident">ctx</span>, <span class="ident">old_scroll_offset</span>);

        <span class="self">self</span>.<span class="ident">clip_rect</span> <span class="op">=</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">scrollable_x</span> <span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">scrollable_y</span> {
            <span class="prelude-val">Some</span>(<span class="ident">ScreenRectangle</span>::<span class="ident">top_left</span>(<span class="ident">top_left</span>, <span class="self">self</span>.<span class="ident">container_dims</span>))
        } <span class="kw">else</span> {
            <span class="prelude-val">None</span>
        };
    }

    <span class="comment">// TODO: this method potentially gets called multiple times in a render pass as an</span>
    <span class="comment">// optimization, we could replace all the current call sites with a &quot;dirty&quot; flag, e.g.</span>
    <span class="comment">// `set_needs_layout()` and then call `layout_if_needed()` once at the last possible moment</span>
    <span class="kw">fn</span> <span class="ident">recompute_layout</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="ident">EventCtx</span>, <span class="ident">recompute_bg</span>: <span class="ident">bool</span>) {
        <span class="self">self</span>.<span class="ident">invalidate_flexbox</span>();
        <span class="self">self</span>.<span class="ident">recompute_layout_if_needed</span>(<span class="ident">ctx</span>, <span class="ident">recompute_bg</span>)
    }

    <span class="kw">fn</span> <span class="ident">invalidate_flexbox</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;invalidating flexbox&quot;</span>);
        <span class="self">self</span>.<span class="ident">cached_flexbox</span> <span class="op">=</span> <span class="prelude-val">None</span>;
    }

    <span class="kw">fn</span> <span class="ident">compute_flexbox</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> (<span class="ident">Stretch</span>, <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Node</span><span class="op">&gt;</span>, <span class="ident">ScreenDims</span>) {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">stretch</span> <span class="op">=</span> <span class="ident">Stretch</span>::<span class="ident">new</span>();
        <span class="kw">let</span> <span class="ident">root</span> <span class="op">=</span> <span class="ident">stretch</span>
            .<span class="ident">new_node</span>(
                <span class="ident">Style</span> {
                    ..<span class="ident">Default</span>::<span class="ident">default</span>()
                },
                <span class="ident">Vec</span>::<span class="ident">new</span>(),
            )
            .<span class="ident">unwrap</span>();

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">nodes</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[];
        <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">get_flexbox</span>(<span class="ident">root</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">stretch</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">nodes</span>);
        <span class="ident">nodes</span>.<span class="ident">reverse</span>();

        <span class="comment">// TODO Express more simply. Constraining this seems useless.</span>
        <span class="kw">let</span> <span class="ident">container_size</span> <span class="op">=</span> <span class="ident">Size</span> {
            <span class="ident">width</span>: <span class="ident">Number</span>::<span class="ident">Undefined</span>,
            <span class="ident">height</span>: <span class="ident">Number</span>::<span class="ident">Undefined</span>,
        };
        <span class="ident">stretch</span>.<span class="ident">compute_layout</span>(<span class="ident">root</span>, <span class="ident">container_size</span>).<span class="ident">unwrap</span>();

        <span class="comment">// TODO I&#39;m so confused why these 2 are acting differently. :(</span>
        <span class="kw">let</span> <span class="ident">effective_dims</span> <span class="op">=</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">scrollable_x</span> <span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">scrollable_y</span> {
            <span class="self">self</span>.<span class="ident">container_dims</span>
        } <span class="kw">else</span> {
            <span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">stretch</span>.<span class="ident">layout</span>(<span class="ident">root</span>).<span class="ident">unwrap</span>();
            <span class="ident">ScreenDims</span>::<span class="ident">new</span>(<span class="ident">result</span>.<span class="ident">size</span>.<span class="ident">width</span>.<span class="ident">into</span>(), <span class="ident">result</span>.<span class="ident">size</span>.<span class="ident">height</span>.<span class="ident">into</span>())
        };

        (<span class="ident">stretch</span>, <span class="ident">nodes</span>, <span class="ident">effective_dims</span>)
    }

    <span class="kw">fn</span> <span class="ident">recompute_layout_if_needed</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="ident">EventCtx</span>, <span class="ident">recompute_bg</span>: <span class="ident">bool</span>) {
        <span class="self">self</span>.<span class="ident">recompute_scrollbar_layout</span>(<span class="ident">ctx</span>);
        <span class="kw">let</span> (<span class="ident">stretch</span>, <span class="ident">nodes</span>, <span class="ident">effective_dims</span>) <span class="op">=</span> <span class="self">self</span>
            .<span class="ident">cached_flexbox</span>
            .<span class="ident">take</span>()
            .<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">compute_flexbox</span>());

        {
            <span class="kw">let</span> <span class="ident">top_left</span> <span class="op">=</span> <span class="ident">ctx</span>
                .<span class="ident">canvas</span>
                .<span class="ident">align_window</span>(<span class="ident">effective_dims</span>, <span class="self">self</span>.<span class="ident">horiz</span>, <span class="self">self</span>.<span class="ident">vert</span>);
            <span class="kw">let</span> <span class="ident">offset</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">scroll_offset</span>();
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">nodes</span> <span class="op">=</span> <span class="ident">nodes</span>.<span class="ident">clone</span>();
            <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">apply_flexbox</span>(
                <span class="kw-2">&amp;</span><span class="ident">stretch</span>,
                <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">nodes</span>,
                <span class="ident">top_left</span>.<span class="ident">x</span>,
                <span class="ident">top_left</span>.<span class="ident">y</span>,
                <span class="ident">offset</span>,
                <span class="ident">ctx</span>,
                <span class="ident">recompute_bg</span>,
                <span class="bool-val">false</span>,
            );
            <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">nodes</span>.<span class="ident">is_empty</span>());
        }
        <span class="self">self</span>.<span class="ident">cached_flexbox</span> <span class="op">=</span> <span class="prelude-val">Some</span>((<span class="ident">stretch</span>, <span class="ident">nodes</span>, <span class="ident">effective_dims</span>));
    }

    <span class="kw">fn</span> <span class="ident">scroll_offset</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> (<span class="ident">f64</span>, <span class="ident">f64</span>) {
        <span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">scrollable_x</span> {
            <span class="self">self</span>.<span class="ident">slider</span>(<span class="string">&quot;horiz scrollbar&quot;</span>).<span class="ident">get_percent</span>()
                <span class="op">*</span> (<span class="self">self</span>.<span class="ident">contents_dims</span>.<span class="ident">width</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">container_dims</span>.<span class="ident">width</span>).<span class="ident">max</span>(<span class="number">0.0</span>)
        } <span class="kw">else</span> {
            <span class="number">0.0</span>
        };
        <span class="kw">let</span> <span class="ident">y</span> <span class="op">=</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">scrollable_y</span> {
            <span class="self">self</span>.<span class="ident">slider</span>(<span class="string">&quot;vert scrollbar&quot;</span>).<span class="ident">get_percent</span>()
                <span class="op">*</span> (<span class="self">self</span>.<span class="ident">contents_dims</span>.<span class="ident">height</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">container_dims</span>.<span class="ident">height</span>).<span class="ident">max</span>(<span class="number">0.0</span>)
        } <span class="kw">else</span> {
            <span class="number">0.0</span>
        };
        (<span class="ident">x</span>, <span class="ident">y</span>)
    }

    <span class="kw">fn</span> <span class="ident">update_scroll_sliders</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="ident">EventCtx</span>, <span class="ident">offset</span>: (<span class="ident">f64</span>, <span class="ident">f64</span>)) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">changed</span> <span class="op">=</span> <span class="bool-val">false</span>;
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">scrollable_x</span> {
            <span class="ident">changed</span> <span class="op">=</span> <span class="bool-val">true</span>;
            <span class="kw">let</span> <span class="ident">max</span> <span class="op">=</span> (<span class="self">self</span>.<span class="ident">contents_dims</span>.<span class="ident">width</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">container_dims</span>.<span class="ident">width</span>).<span class="ident">max</span>(<span class="number">0.0</span>);
            <span class="kw">if</span> <span class="ident">max</span> <span class="op">=</span><span class="op">=</span> <span class="number">0.0</span> {
                <span class="self">self</span>.<span class="ident">slider_mut</span>(<span class="string">&quot;horiz scrollbar&quot;</span>).<span class="ident">set_percent</span>(<span class="ident">ctx</span>, <span class="number">0.0</span>);
            } <span class="kw">else</span> {
                <span class="self">self</span>.<span class="ident">slider_mut</span>(<span class="string">&quot;horiz scrollbar&quot;</span>)
                    .<span class="ident">set_percent</span>(<span class="ident">ctx</span>, <span class="ident">offset</span>.<span class="number">0</span>.<span class="ident">clamp</span>(<span class="number">0.0</span>, <span class="ident">max</span>) <span class="op">/</span> <span class="ident">max</span>);
            }
        }
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">scrollable_y</span> {
            <span class="ident">changed</span> <span class="op">=</span> <span class="bool-val">true</span>;
            <span class="kw">let</span> <span class="ident">max</span> <span class="op">=</span> (<span class="self">self</span>.<span class="ident">contents_dims</span>.<span class="ident">height</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">container_dims</span>.<span class="ident">height</span>).<span class="ident">max</span>(<span class="number">0.0</span>);
            <span class="kw">if</span> <span class="ident">max</span> <span class="op">=</span><span class="op">=</span> <span class="number">0.0</span> {
                <span class="self">self</span>.<span class="ident">slider_mut</span>(<span class="string">&quot;vert scrollbar&quot;</span>).<span class="ident">set_percent</span>(<span class="ident">ctx</span>, <span class="number">0.0</span>);
            } <span class="kw">else</span> {
                <span class="self">self</span>.<span class="ident">slider_mut</span>(<span class="string">&quot;vert scrollbar&quot;</span>)
                    .<span class="ident">set_percent</span>(<span class="ident">ctx</span>, <span class="ident">offset</span>.<span class="number">1</span>.<span class="ident">clamp</span>(<span class="number">0.0</span>, <span class="ident">max</span>) <span class="op">/</span> <span class="ident">max</span>);
            }
        }
        <span class="ident">changed</span>
    }

    <span class="kw">fn</span> <span class="ident">set_scroll_offset</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="ident">EventCtx</span>, <span class="ident">offset</span>: (<span class="ident">f64</span>, <span class="ident">f64</span>)) {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">update_scroll_sliders</span>(<span class="ident">ctx</span>, <span class="ident">offset</span>) {
            <span class="self">self</span>.<span class="ident">recompute_layout_if_needed</span>(<span class="ident">ctx</span>, <span class="bool-val">false</span>);
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">event</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Outcome</span> {
        <span class="kw">if</span> (<span class="self">self</span>.<span class="ident">scrollable_x</span> <span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">scrollable_y</span>)
            <span class="op">&amp;&amp;</span> <span class="ident">ctx</span>
                .<span class="ident">canvas</span>
                .<span class="ident">get_cursor_in_screen_space</span>()
                .<span class="ident">map</span>(<span class="op">|</span><span class="ident">pt</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">rect</span>.<span class="ident">contains</span>(<span class="ident">pt</span>))
                .<span class="ident">unwrap_or</span>(<span class="bool-val">false</span>)
        {
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">dx</span>, <span class="ident">dy</span>)) <span class="op">=</span> <span class="ident">ctx</span>.<span class="ident">input</span>.<span class="ident">get_mouse_scroll</span>() {
                <span class="kw">let</span> <span class="ident">x_offset</span> <span class="op">=</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">scrollable_x</span> {
                    <span class="self">self</span>.<span class="ident">scroll_offset</span>().<span class="number">0</span> <span class="op">+</span> <span class="ident">dx</span> <span class="op">*</span> (<span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">settings</span>.<span class="ident">gui_scroll_speed</span> <span class="kw">as</span> <span class="ident">f64</span>)
                } <span class="kw">else</span> {
                    <span class="number">0.0</span>
                };
                <span class="kw">let</span> <span class="ident">y_offset</span> <span class="op">=</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">scrollable_y</span> {
                    <span class="self">self</span>.<span class="ident">scroll_offset</span>().<span class="number">1</span> <span class="op">-</span> <span class="ident">dy</span> <span class="op">*</span> (<span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">settings</span>.<span class="ident">gui_scroll_speed</span> <span class="kw">as</span> <span class="ident">f64</span>)
                } <span class="kw">else</span> {
                    <span class="number">0.0</span>
                };
                <span class="self">self</span>.<span class="ident">set_scroll_offset</span>(<span class="ident">ctx</span>, (<span class="ident">x_offset</span>, <span class="ident">y_offset</span>));
            }
        }

        <span class="kw">if</span> <span class="ident">ctx</span>.<span class="ident">input</span>.<span class="ident">is_window_resized</span>() {
            <span class="self">self</span>.<span class="ident">update_container_dims_for_canvas_dims</span>(<span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">get_window_dims</span>());
            <span class="self">self</span>.<span class="ident">recompute_layout</span>(<span class="ident">ctx</span>, <span class="bool-val">false</span>);
        }

        <span class="kw">let</span> <span class="ident">before</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">scroll_offset</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">output</span> <span class="op">=</span> <span class="ident">WidgetOutput</span>::<span class="ident">new</span>();
        <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">widget</span>.<span class="ident">event</span>(<span class="ident">ctx</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">output</span>);

        <span class="kw">if</span> <span class="ident">output</span>.<span class="ident">redo_layout</span> {
            <span class="self">self</span>.<span class="ident">recompute_layout</span>(<span class="ident">ctx</span>, <span class="bool-val">true</span>);
        } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">scroll_offset</span>() <span class="op">!</span><span class="op">=</span> <span class="ident">before</span> {
            <span class="self">self</span>.<span class="ident">recompute_layout_if_needed</span>(<span class="ident">ctx</span>, <span class="bool-val">true</span>);
        }

        <span class="ident">output</span>.<span class="ident">outcome</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">draw</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">g</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">GfxCtx</span>) {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">rect</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">clip_rect</span> {
            <span class="ident">g</span>.<span class="ident">enable_clipping</span>(<span class="ident">rect</span>.<span class="ident">clone</span>());
            <span class="ident">g</span>.<span class="ident">canvas</span>.<span class="ident">mark_covered_area</span>(<span class="ident">rect</span>.<span class="ident">clone</span>());
        } <span class="kw">else</span> {
            <span class="ident">g</span>.<span class="ident">canvas</span>.<span class="ident">mark_covered_area</span>(<span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">rect</span>.<span class="ident">clone</span>());
        }

        <span class="comment">// Debugging</span>
        <span class="kw">if</span> <span class="bool-val">false</span> {
            <span class="ident">g</span>.<span class="ident">fork_screenspace</span>();
            <span class="ident">g</span>.<span class="ident">draw_polygon</span>(<span class="ident">Color</span>::<span class="ident">RED</span>.<span class="ident">alpha</span>(<span class="number">0.5</span>), <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">rect</span>.<span class="ident">to_polygon</span>());

            <span class="kw">let</span> <span class="ident">top_left</span> <span class="op">=</span> <span class="ident">g</span>
                .<span class="ident">canvas</span>
                .<span class="ident">align_window</span>(<span class="self">self</span>.<span class="ident">container_dims</span>, <span class="self">self</span>.<span class="ident">horiz</span>, <span class="self">self</span>.<span class="ident">vert</span>);
            <span class="ident">g</span>.<span class="ident">draw_polygon</span>(
                <span class="ident">Color</span>::<span class="ident">BLUE</span>.<span class="ident">alpha</span>(<span class="number">0.5</span>),
                <span class="ident">Polygon</span>::<span class="ident">rectangle</span>(<span class="self">self</span>.<span class="ident">container_dims</span>.<span class="ident">width</span>, <span class="self">self</span>.<span class="ident">container_dims</span>.<span class="ident">height</span>)
                    .<span class="ident">translate</span>(<span class="ident">top_left</span>.<span class="ident">x</span>, <span class="ident">top_left</span>.<span class="ident">y</span>),
            );
            <span class="ident">g</span>.<span class="ident">unfork</span>();
        }

        <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">draw</span>(<span class="ident">g</span>);
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">scrollable_x</span> <span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">scrollable_y</span> {
            <span class="ident">g</span>.<span class="ident">disable_clipping</span>();

            <span class="comment">// Draw the scrollbars after clipping is disabled, because they actually live just</span>
            <span class="comment">// outside the rectangle.</span>
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">scrollable_x</span> {
                <span class="self">self</span>.<span class="ident">slider</span>(<span class="string">&quot;horiz scrollbar&quot;</span>).<span class="ident">draw</span>(<span class="ident">g</span>);
            }
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">scrollable_y</span> {
                <span class="self">self</span>.<span class="ident">slider</span>(<span class="string">&quot;vert scrollbar&quot;</span>).<span class="ident">draw</span>(<span class="ident">g</span>);
            }
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_all_click_actions</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">HashSet</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">actions</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
        <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">get_all_click_actions</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">actions</span>);
        <span class="ident">actions</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">restore</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>, <span class="ident">prev</span>: <span class="kw-2">&amp;</span><span class="ident">Panel</span>) {
        <span class="self">self</span>.<span class="ident">set_scroll_offset</span>(<span class="ident">ctx</span>, <span class="ident">prev</span>.<span class="ident">scroll_offset</span>());

        <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">restore</span>(<span class="ident">ctx</span>, <span class="kw-2">&amp;</span><span class="ident">prev</span>);

        <span class="comment">// Since we just moved things around, let all widgets respond to the mouse being somewhere</span>
        <span class="ident">ctx</span>.<span class="ident">no_op_event</span>(<span class="bool-val">true</span>, <span class="op">|</span><span class="ident">ctx</span><span class="op">|</span> <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">event</span>(<span class="ident">ctx</span>), <span class="ident">Outcome</span>::<span class="ident">Nothing</span>));
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">scroll_to_member</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="ident">EventCtx</span>, <span class="ident">name</span>: <span class="ident">String</span>) {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">w</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">find</span>(<span class="kw-2">&amp;</span><span class="ident">name</span>) {
            <span class="kw">let</span> <span class="ident">y1</span> <span class="op">=</span> <span class="ident">w</span>.<span class="ident">rect</span>.<span class="ident">y1</span>;
            <span class="self">self</span>.<span class="ident">set_scroll_offset</span>(<span class="ident">ctx</span>, (<span class="number">0.0</span>, <span class="ident">y1</span>));
        } <span class="kw">else</span> {
            <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Can&#39;t scroll_to_member of unknown {}&quot;</span>, <span class="ident">name</span>);
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">has_widget</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">find</span>(<span class="ident">name</span>).<span class="ident">is_some</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">slider</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">Slider</span> {
        <span class="self">self</span>.<span class="ident">find</span>(<span class="ident">name</span>)
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">slider_mut</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Slider</span> {
        <span class="self">self</span>.<span class="ident">find_mut</span>(<span class="ident">name</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">take_menu_choice</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="lifetime">&#39;static</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">T</span> {
        <span class="self">self</span>.<span class="ident">find_mut</span>::<span class="op">&lt;</span><span class="ident">Menu</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="ident">name</span>).<span class="ident">take_current_choice</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_checked</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">find</span>::<span class="op">&lt;</span><span class="ident">Toggle</span><span class="op">&gt;</span>(<span class="ident">name</span>).<span class="ident">enabled</span>
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">maybe_is_checked</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">bool</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">has_widget</span>(<span class="ident">name</span>) {
            <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">find</span>::<span class="op">&lt;</span><span class="ident">Toggle</span><span class="op">&gt;</span>(<span class="ident">name</span>).<span class="ident">enabled</span>)
        } <span class="kw">else</span> {
            <span class="prelude-val">None</span>
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">text_box</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">String</span> {
        <span class="self">self</span>.<span class="ident">find</span>::<span class="op">&lt;</span><span class="ident">TextBox</span><span class="op">&gt;</span>(<span class="ident">name</span>).<span class="ident">get_line</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">spinner</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="lifetime">&#39;static</span> <span class="op">+</span> <span class="ident">SpinnerValue</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">T</span> {
        <span class="self">self</span>.<span class="ident">find</span>::<span class="op">&lt;</span><span class="ident">Spinner</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="ident">name</span>).<span class="ident">current</span>
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">modify_spinner</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="lifetime">&#39;static</span> <span class="op">+</span> <span class="ident">SpinnerValue</span><span class="op">&gt;</span>(
        <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>,
        <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="ident">EventCtx</span>,
        <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>,
        <span class="ident">delta</span>: <span class="ident">T</span>,
    ) {
        <span class="self">self</span>.<span class="ident">find_mut</span>::<span class="op">&lt;</span><span class="ident">Spinner</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="ident">name</span>).<span class="ident">modify</span>(<span class="ident">ctx</span>, <span class="ident">delta</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">dropdown_value</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="lifetime">&#39;static</span> <span class="op">+</span> <span class="ident">PartialEq</span> <span class="op">+</span> <span class="ident">Clone</span>, <span class="ident">I</span>: <span class="ident">AsRef</span><span class="op">&lt;</span><span class="ident">str</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">name</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">T</span> {
        <span class="self">self</span>.<span class="ident">find</span>::<span class="op">&lt;</span><span class="ident">Dropdown</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="ident">name</span>.<span class="ident">as_ref</span>()).<span class="ident">current_value</span>()
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">maybe_dropdown_value</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="lifetime">&#39;static</span> <span class="op">+</span> <span class="ident">PartialEq</span> <span class="op">+</span> <span class="ident">Clone</span>, <span class="ident">I</span>: <span class="ident">AsRef</span><span class="op">&lt;</span><span class="ident">str</span><span class="op">&gt;</span><span class="op">&gt;</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">name</span>: <span class="ident">I</span>,
    ) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="ident">name</span>.<span class="ident">as_ref</span>();
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">has_widget</span>(<span class="ident">name</span>) {
            <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">find</span>::<span class="op">&lt;</span><span class="ident">Dropdown</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="ident">name</span>).<span class="ident">current_value</span>())
        } <span class="kw">else</span> {
            <span class="prelude-val">None</span>
        }
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">persistent_split_value</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="lifetime">&#39;static</span> <span class="op">+</span> <span class="ident">PartialEq</span> <span class="op">+</span> <span class="ident">Clone</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">T</span> {
        <span class="self">self</span>.<span class="ident">find</span>::<span class="op">&lt;</span><span class="ident">PersistentSplit</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="ident">name</span>).<span class="ident">current_value</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">autocomplete_done</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="lifetime">&#39;static</span> <span class="op">+</span> <span class="ident">Clone</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">find</span>::<span class="op">&lt;</span><span class="ident">Autocomplete</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="ident">name</span>).<span class="ident">final_value</span>()
    }

    <span class="doccomment">/// Grab a stashed value, with the ability to pass it around and modify it.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">stash</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="lifetime">&#39;static</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Rc</span><span class="op">&lt;</span><span class="ident">RefCell</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">find</span>::<span class="op">&lt;</span><span class="ident">Stash</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="ident">name</span>).<span class="ident">get_value</span>()
    }

    <span class="doccomment">/// Grab a stashed value and clone it.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clone_stashed</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="lifetime">&#39;static</span> <span class="op">+</span> <span class="ident">Clone</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">T</span> {
        <span class="self">self</span>.<span class="ident">find</span>::<span class="op">&lt;</span><span class="ident">Stash</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="ident">name</span>).<span class="ident">get_value</span>().<span class="ident">borrow</span>().<span class="ident">clone</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_button_enabled</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">find</span>::<span class="op">&lt;</span><span class="ident">Button</span><span class="op">&gt;</span>(<span class="ident">name</span>).<span class="ident">is_enabled</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">maybe_find</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">Widget</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">find</span>(<span class="ident">name</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">find</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">WidgetImpl</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">T</span> {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">w</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">find</span>(<span class="ident">name</span>) {
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=</span> <span class="ident">w</span>.<span class="ident">widget</span>.<span class="ident">downcast_ref</span>::<span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>() {
                <span class="ident">x</span>
            } <span class="kw">else</span> {
                <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Found widget {}, but wrong type&quot;</span>, <span class="ident">name</span>);
            }
        } <span class="kw">else</span> {
            <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Can&#39;t find widget {}&quot;</span>, <span class="ident">name</span>);
        }
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">find_mut</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">WidgetImpl</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">T</span> {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">w</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">find_mut</span>(<span class="ident">name</span>) {
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=</span> <span class="ident">w</span>.<span class="ident">widget</span>.<span class="ident">downcast_mut</span>::<span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>() {
                <span class="ident">x</span>
            } <span class="kw">else</span> {
                <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Found widget {}, but wrong type&quot;</span>, <span class="ident">name</span>);
            }
        } <span class="kw">else</span> {
            <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Can&#39;t find widget {}&quot;</span>, <span class="ident">name</span>);
        }
    }

    <span class="doccomment">/// Swap the inner content of a `container` widget with `new_inner_content`.</span>
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">swap_inner_content</span>(
        <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>,
        <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="ident">EventCtx</span>,
        <span class="ident">container_name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>,
        <span class="ident">new_inner_content</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Widget</span>,
    ) {
        <span class="kw">let</span> <span class="ident">old_container</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Container</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">find_mut</span>(<span class="ident">container_name</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="ident">old_container</span>.<span class="ident">members</span>.<span class="ident">len</span>(),
            <span class="number">1</span>,
            <span class="string">&quot;method only intended to be used for containers created with `Widget::container`&quot;</span>
        );
        <span class="ident">std</span>::<span class="ident">mem</span>::<span class="ident">swap</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">old_container</span>.<span class="ident">members</span>[<span class="number">0</span>], <span class="ident">new_inner_content</span>);
        <span class="self">self</span>.<span class="ident">recompute_layout</span>(<span class="ident">ctx</span>, <span class="bool-val">true</span>);
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rect_of</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">ScreenRectangle</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">find</span>(<span class="ident">name</span>).<span class="ident">unwrap</span>().<span class="ident">rect</span>
    }
    <span class="comment">// TODO Deprecate</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">center_of</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">ScreenPt</span> {
        <span class="self">self</span>.<span class="ident">rect_of</span>(<span class="ident">name</span>).<span class="ident">center</span>()
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">center_of_panel</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">ScreenPt</span> {
        <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">rect</span>.<span class="ident">center</span>()
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">panel_dims</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">ScreenDims</span> {
        <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">rect</span>.<span class="ident">dims</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">align</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">horiz</span>: <span class="ident">HorizontalAlignment</span>, <span class="ident">vert</span>: <span class="ident">VerticalAlignment</span>) {
        <span class="self">self</span>.<span class="ident">horiz</span> <span class="op">=</span> <span class="ident">horiz</span>;
        <span class="self">self</span>.<span class="ident">vert</span> <span class="op">=</span> <span class="ident">vert</span>;
        <span class="comment">// TODO Recompute layout and fire no_op_event?</span>
    }

    <span class="doccomment">/// All margins/padding/etc from the previous widget are retained. The ID is set on the new</span>
    <span class="doccomment">/// widget; no need to do that yourself.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">replace</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>, <span class="ident">id</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="kw-2">mut</span> <span class="ident">new</span>: <span class="ident">Widget</span>) {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">new_id</span>) <span class="op">=</span> <span class="ident">new</span>.<span class="ident">id</span> {
            <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">id</span>, <span class="ident">new_id</span>);
        }
        <span class="ident">new</span> <span class="op">=</span> <span class="ident">new</span>.<span class="ident">named</span>(<span class="ident">id</span>);
        <span class="kw">let</span> <span class="ident">old</span> <span class="op">=</span> <span class="self">self</span>
            .<span class="ident">top_level</span>
            .<span class="ident">find_mut</span>(<span class="ident">id</span>)
            .<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Panel doesn&#39;t have {}&quot;</span>, <span class="ident">id</span>));
        <span class="ident">new</span>.<span class="ident">layout</span>.<span class="ident">style</span> <span class="op">=</span> <span class="ident">old</span>.<span class="ident">layout</span>.<span class="ident">style</span>;
        <span class="kw-2">*</span><span class="ident">old</span> <span class="op">=</span> <span class="ident">new</span>;
        <span class="self">self</span>.<span class="ident">recompute_layout</span>(<span class="ident">ctx</span>, <span class="bool-val">true</span>);
        <span class="comment">// TODO Since we just moved things around, let all widgets respond to the mouse being</span>
        <span class="comment">// somewhere? Maybe always do this in recompute_layout?</span>
        <span class="comment">//ctx.no_op_event(true, |ctx| assert_eq!(self.event(ctx), Outcome::Nothing));</span>
    }

    <span class="doccomment">/// Removes a widget from the panel. Does not recalculate layout!</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">take</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">id</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Widget</span> {
        <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">take</span>(<span class="ident">id</span>).<span class="ident">unwrap</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clicked_outside</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="comment">// TODO No great way to populate OSD from here with &quot;click to cancel&quot;</span>
        <span class="op">!</span><span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">rect</span>.<span class="ident">contains</span>(<span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">get_cursor</span>()) <span class="op">&amp;&amp;</span> <span class="ident">ctx</span>.<span class="ident">normal_left_click</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">currently_hovering</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">String</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">currently_hovering</span>()
    }
}

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">PanelBuilder</span> {
    <span class="ident">top_level</span>: <span class="ident">Widget</span>,
    <span class="ident">horiz</span>: <span class="ident">HorizontalAlignment</span>,
    <span class="ident">vert</span>: <span class="ident">VerticalAlignment</span>,
    <span class="ident">dims</span>: <span class="ident">Dims</span>,
}

<span class="kw">enum</span> <span class="ident">Dims</span> {
    <span class="ident">MaxPercent</span>(<span class="ident">Percent</span>, <span class="ident">Percent</span>),
    <span class="ident">ExactPercent</span>(<span class="ident">f64</span>, <span class="ident">f64</span>),
    <span class="ident">ExactHeight</span>(<span class="ident">f64</span>),
    <span class="ident">ExactSize</span>(<span class="ident">ScreenDims</span>),
}

<span class="kw">impl</span> <span class="ident">PanelBuilder</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">build</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Panel</span> {
        <span class="self">self</span>.<span class="ident">top_level</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">top_level</span>.<span class="ident">padding</span>(<span class="number">16</span>).<span class="ident">bg</span>(<span class="ident">ctx</span>.<span class="ident">style</span>.<span class="ident">panel_bg</span>);
        <span class="self">self</span>.<span class="ident">build_custom</span>(<span class="ident">ctx</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">build_custom</span>(<span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Panel</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">panel</span> <span class="op">=</span> <span class="ident">Panel</span> {
            <span class="ident">top_level</span>: <span class="self">self</span>.<span class="ident">top_level</span>,

            <span class="ident">horiz</span>: <span class="self">self</span>.<span class="ident">horiz</span>,
            <span class="ident">vert</span>: <span class="self">self</span>.<span class="ident">vert</span>,
            <span class="ident">dims</span>: <span class="self">self</span>.<span class="ident">dims</span>,

            <span class="ident">scrollable_x</span>: <span class="bool-val">false</span>,
            <span class="ident">scrollable_y</span>: <span class="bool-val">false</span>,
            <span class="ident">contents_dims</span>: <span class="ident">ScreenDims</span>::<span class="ident">new</span>(<span class="number">0.0</span>, <span class="number">0.0</span>),
            <span class="ident">container_dims</span>: <span class="ident">ScreenDims</span>::<span class="ident">new</span>(<span class="number">0.0</span>, <span class="number">0.0</span>),
            <span class="ident">clip_rect</span>: <span class="prelude-val">None</span>,
            <span class="ident">cached_flexbox</span>: <span class="prelude-val">None</span>,
        };
        <span class="kw">match</span> <span class="ident">panel</span>.<span class="ident">dims</span> {
            <span class="ident">Dims</span>::<span class="ident">ExactPercent</span>(<span class="ident">w</span>, <span class="ident">h</span>) <span class="op">=</span><span class="op">&gt;</span> {
                <span class="comment">// Don&#39;t set size, because then scrolling breaks -- the actual size has to be based</span>
                <span class="comment">// on the contents.</span>
                <span class="ident">panel</span>.<span class="ident">top_level</span>.<span class="ident">layout</span>.<span class="ident">style</span>.<span class="ident">min_size</span> <span class="op">=</span> <span class="ident">Size</span> {
                    <span class="ident">width</span>: <span class="ident">Dimension</span>::<span class="ident">Points</span>((<span class="ident">w</span> <span class="op">*</span> <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">window_width</span>) <span class="kw">as</span> <span class="ident">f32</span>),
                    <span class="ident">height</span>: <span class="ident">Dimension</span>::<span class="ident">Points</span>((<span class="ident">h</span> <span class="op">*</span> <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">window_height</span>) <span class="kw">as</span> <span class="ident">f32</span>),
                };
            }
            <span class="ident">Dims</span>::<span class="ident">ExactHeight</span>(<span class="ident">h</span>) <span class="op">=</span><span class="op">&gt;</span> {
                <span class="ident">panel</span>.<span class="ident">top_level</span>.<span class="ident">layout</span>.<span class="ident">style</span>.<span class="ident">min_size</span>.<span class="ident">height</span> <span class="op">=</span> <span class="ident">Dimension</span>::<span class="ident">Points</span>(<span class="ident">h</span> <span class="kw">as</span> <span class="ident">f32</span>);
            }
            <span class="ident">Dims</span>::<span class="ident">ExactSize</span>(<span class="ident">dims</span>) <span class="op">=</span><span class="op">&gt;</span> {
                <span class="ident">panel</span>.<span class="ident">top_level</span>.<span class="ident">layout</span>.<span class="ident">style</span>.<span class="ident">min_size</span> <span class="op">=</span> <span class="ident">dims</span>.<span class="ident">into</span>();
            }
            <span class="ident">Dims</span>::<span class="ident">MaxPercent</span>(<span class="kw">_</span>, <span class="kw">_</span>) <span class="op">=</span><span class="op">&gt;</span> {}
        }

        <span class="comment">// There is a dependency cycle in our layout logic. As a consequence:</span>
        <span class="comment">//   1. we have to call `recompute_layout` twice here</span>
        <span class="comment">//   2. panels don&#39;t responsively change `contents_dims`</span>
        <span class="comment">//</span>
        <span class="comment">// - `panel.top_level.rect`, used here to set content_dims, is set by `recompute_layout`.</span>
        <span class="comment">// - the output of `recompute_layout` depends on `container_dims`</span>
        <span class="comment">// - `container_dims`, in the case of `MaxPercent`, depend on `content_dims`</span>
        <span class="comment">//</span>
        <span class="comment">// TODO: to support Panel&#39;s that can resize their `contents_dims`, we&#39;ll need to detangle</span>
        <span class="comment">// this dependency. This might entail decomposing the flexbox calculation to layout first</span>
        <span class="comment">// the inner content, and then potentially a second pass to layout any x/y scrollbars.</span>
        <span class="ident">panel</span>.<span class="ident">recompute_layout</span>(<span class="ident">ctx</span>, <span class="bool-val">false</span>);
        <span class="ident">panel</span>.<span class="ident">contents_dims</span> <span class="op">=</span>
            <span class="ident">ScreenDims</span>::<span class="ident">new</span>(<span class="ident">panel</span>.<span class="ident">top_level</span>.<span class="ident">rect</span>.<span class="ident">width</span>(), <span class="ident">panel</span>.<span class="ident">top_level</span>.<span class="ident">rect</span>.<span class="ident">height</span>());
        <span class="ident">panel</span>.<span class="ident">update_container_dims_for_canvas_dims</span>(<span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">get_window_dims</span>());
        <span class="ident">panel</span>.<span class="ident">recompute_layout</span>(<span class="ident">ctx</span>, <span class="bool-val">false</span>);

        <span class="comment">// Just trigger error if a button is double-defined</span>
        <span class="ident">panel</span>.<span class="ident">get_all_click_actions</span>();
        <span class="comment">// Let all widgets initially respond to the mouse being somewhere</span>
        <span class="ident">ctx</span>.<span class="ident">no_op_event</span>(<span class="bool-val">true</span>, <span class="op">|</span><span class="ident">ctx</span><span class="op">|</span> <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">panel</span>.<span class="ident">event</span>(<span class="ident">ctx</span>), <span class="ident">Outcome</span>::<span class="ident">Nothing</span>));
        <span class="ident">panel</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">aligned</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">horiz</span>: <span class="ident">HorizontalAlignment</span>, <span class="ident">vert</span>: <span class="ident">VerticalAlignment</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">PanelBuilder</span> {
        <span class="self">self</span>.<span class="ident">horiz</span> <span class="op">=</span> <span class="ident">horiz</span>;
        <span class="self">self</span>.<span class="ident">vert</span> <span class="op">=</span> <span class="ident">vert</span>;
        <span class="self">self</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">aligned_pair</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">pair</span>: (<span class="ident">HorizontalAlignment</span>, <span class="ident">VerticalAlignment</span>)) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">PanelBuilder</span> {
        <span class="self">self</span>.<span class="ident">horiz</span> <span class="op">=</span> <span class="ident">pair</span>.<span class="number">0</span>;
        <span class="self">self</span>.<span class="ident">vert</span> <span class="op">=</span> <span class="ident">pair</span>.<span class="number">1</span>;
        <span class="self">self</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">max_size</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">width</span>: <span class="ident">Percent</span>, <span class="ident">height</span>: <span class="ident">Percent</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">PanelBuilder</span> {
        <span class="kw">if</span> <span class="ident">width</span> <span class="op">=</span><span class="op">=</span> <span class="ident">Percent</span>::<span class="ident">int</span>(<span class="number">100</span>) <span class="op">&amp;&amp;</span> <span class="ident">height</span> <span class="op">=</span><span class="op">=</span> <span class="ident">Percent</span>::<span class="ident">int</span>(<span class="number">100</span>) {
            <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;By default, Panels are capped at 100% of the screen. This is redundant.&quot;</span>);
        }
        <span class="self">self</span>.<span class="ident">dims</span> <span class="op">=</span> <span class="ident">Dims</span>::<span class="ident">MaxPercent</span>(<span class="ident">width</span>, <span class="ident">height</span>);
        <span class="self">self</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">exact_size_percent</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">pct_width</span>: <span class="ident">usize</span>, <span class="ident">pct_height</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">PanelBuilder</span> {
        <span class="self">self</span>.<span class="ident">dims</span> <span class="op">=</span> <span class="ident">Dims</span>::<span class="ident">ExactPercent</span>((<span class="ident">pct_width</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">/</span> <span class="number">100.0</span>, (<span class="ident">pct_height</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">/</span> <span class="number">100.0</span>);
        <span class="self">self</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">exact_height</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">height</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">PanelBuilder</span> {
        <span class="self">self</span>.<span class="ident">dims</span> <span class="op">=</span> <span class="ident">Dims</span>::<span class="ident">ExactHeight</span>(<span class="ident">height</span>);
        <span class="self">self</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">exact_size</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">size</span>: <span class="ident">ScreenDims</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">PanelBuilder</span> {
        <span class="self">self</span>.<span class="ident">dims</span> <span class="op">=</span> <span class="ident">Dims</span>::<span class="ident">ExactSize</span>(<span class="ident">size</span>);
        <span class="self">self</span>
    }
}
</pre></div>
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