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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">geom</span>::<span class="ident">Polygon</span>;

<span class="kw">use</span> <span class="kw">crate</span>::{
    <span class="ident">Drawable</span>, <span class="ident">EventCtx</span>, <span class="ident">GeomBatch</span>, <span class="ident">GfxCtx</span>, <span class="ident">ScreenDims</span>, <span class="ident">ScreenPt</span>, <span class="ident">ScreenRectangle</span>, <span class="ident">Text</span>, <span class="ident">Widget</span>,
    <span class="ident">WidgetImpl</span>, <span class="ident">WidgetOutput</span>,
};

<span class="comment">// Just draw something, no interaction.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">JustDraw</span> {
    <span class="kw">pub</span> <span class="ident">draw</span>: <span class="ident">Drawable</span>,

    <span class="kw">pub</span> <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>,
    <span class="kw">pub</span> <span class="ident">dims</span>: <span class="ident">ScreenDims</span>,
}

<span class="kw">impl</span> <span class="ident">JustDraw</span> {
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">wrap</span>(<span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="ident">EventCtx</span>, <span class="ident">batch</span>: <span class="ident">GeomBatch</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Widget</span> {
        <span class="ident">Widget</span>::<span class="ident">new</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">JustDraw</span> {
            <span class="ident">dims</span>: <span class="ident">batch</span>.<span class="ident">get_dims</span>(),
            <span class="ident">draw</span>: <span class="ident">ctx</span>.<span class="ident">upload</span>(<span class="ident">batch</span>),
            <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>::<span class="ident">new</span>(<span class="number">0.0</span>, <span class="number">0.0</span>),
        }))
    }
}

<span class="kw">impl</span> <span class="ident">WidgetImpl</span> <span class="kw">for</span> <span class="ident">JustDraw</span> {
    <span class="kw">fn</span> <span class="ident">get_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">dims</span>
    }

    <span class="kw">fn</span> <span class="ident">set_pos</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>) {
        <span class="self">self</span>.<span class="ident">top_left</span> <span class="op">=</span> <span class="ident">top_left</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="kw">_</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>, <span class="kw">_</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">WidgetOutput</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="ident">g</span>.<span class="ident">redraw_at</span>(<span class="self">self</span>.<span class="ident">top_left</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">draw</span>);
    }
}

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">DrawWithTooltips</span> {
    <span class="ident">draw</span>: <span class="ident">Drawable</span>,
    <span class="ident">tooltips</span>: <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">Polygon</span>, <span class="ident">Text</span>)<span class="op">&gt;</span>,
    <span class="ident">hover</span>: <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Fn</span>(<span class="kw-2">&amp;</span><span class="ident">Polygon</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">GeomBatch</span><span class="op">&gt;</span>,

    <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>,
    <span class="ident">dims</span>: <span class="ident">ScreenDims</span>,
}

<span class="kw">impl</span> <span class="ident">DrawWithTooltips</span> {
    <span class="doccomment">/// `batch`: the `GeomBatch` to draw</span>
    <span class="doccomment">/// `tooltips`: (hitbox, text) tuples where each `text` is shown when the user hovers over</span>
    <span class="doccomment">///             the respective `hitbox`</span>
    <span class="doccomment">/// `hover`: returns a GeomBatch to render upon hovering. Return an `GeomBox::new()` if</span>
    <span class="doccomment">///          you want hovering to be a no-op</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(
        <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="ident">EventCtx</span>,
        <span class="ident">batch</span>: <span class="ident">GeomBatch</span>,
        <span class="ident">tooltips</span>: <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">Polygon</span>, <span class="ident">Text</span>)<span class="op">&gt;</span>,
        <span class="ident">hover</span>: <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Fn</span>(<span class="kw-2">&amp;</span><span class="ident">Polygon</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">GeomBatch</span><span class="op">&gt;</span>,
    ) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Widget</span> {
        <span class="ident">Widget</span>::<span class="ident">new</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">DrawWithTooltips</span> {
            <span class="ident">dims</span>: <span class="ident">batch</span>.<span class="ident">get_dims</span>(),
            <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>::<span class="ident">new</span>(<span class="number">0.0</span>, <span class="number">0.0</span>),
            <span class="ident">hover</span>,
            <span class="ident">draw</span>: <span class="ident">ctx</span>.<span class="ident">upload</span>(<span class="ident">batch</span>),
            <span class="ident">tooltips</span>,
        }))
    }
}

<span class="kw">impl</span> <span class="ident">WidgetImpl</span> <span class="kw">for</span> <span class="ident">DrawWithTooltips</span> {
    <span class="kw">fn</span> <span class="ident">get_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">dims</span>
    }

    <span class="kw">fn</span> <span class="ident">set_pos</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>) {
        <span class="self">self</span>.<span class="ident">top_left</span> <span class="op">=</span> <span class="ident">top_left</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="kw">_</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>, <span class="kw">_</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">WidgetOutput</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="ident">g</span>.<span class="ident">redraw_at</span>(<span class="self">self</span>.<span class="ident">top_left</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">draw</span>);

        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">cursor</span>) <span class="op">=</span> <span class="ident">g</span>.<span class="ident">canvas</span>.<span class="ident">get_cursor_in_screen_space</span>() {
            <span class="kw">if</span> <span class="op">!</span><span class="ident">ScreenRectangle</span>::<span class="ident">top_left</span>(<span class="self">self</span>.<span class="ident">top_left</span>, <span class="self">self</span>.<span class="ident">dims</span>).<span class="ident">contains</span>(<span class="ident">cursor</span>) {
                <span class="kw">return</span>;
            }
            <span class="kw">let</span> <span class="ident">translated</span> <span class="op">=</span>
                <span class="ident">ScreenPt</span>::<span class="ident">new</span>(<span class="ident">cursor</span>.<span class="ident">x</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">top_left</span>.<span class="ident">x</span>, <span class="ident">cursor</span>.<span class="ident">y</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">top_left</span>.<span class="ident">y</span>).<span class="ident">to_pt</span>();
            <span class="comment">// TODO Assume regions are non-overlapping</span>
            <span class="kw">for</span> (<span class="ident">region</span>, <span class="ident">txt</span>) <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">tooltips</span> {
                <span class="kw">if</span> <span class="ident">region</span>.<span class="ident">contains_pt</span>(<span class="ident">translated</span>) {
                    <span class="kw">let</span> <span class="ident">extra</span> <span class="op">=</span> <span class="ident">g</span>.<span class="ident">upload</span>((<span class="self">self</span>.<span class="ident">hover</span>)(<span class="ident">region</span>));
                    <span class="ident">g</span>.<span class="ident">redraw_at</span>(<span class="self">self</span>.<span class="ident">top_left</span>, <span class="kw-2">&amp;</span><span class="ident">extra</span>);
                    <span class="ident">g</span>.<span class="ident">draw_mouse_tooltip</span>(<span class="ident">txt</span>.<span class="ident">clone</span>());
                    <span class="kw">return</span>;
                }
            }
        }
    }
}

<span class="comment">// TODO Name is bad. Lay out JustDraw stuff with flexbox, just to consume it and produce one big</span>
<span class="comment">// GeomBatch.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">DeferDraw</span> {
    <span class="kw">pub</span> <span class="ident">batch</span>: <span class="ident">GeomBatch</span>,

    <span class="kw">pub</span> <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>,
    <span class="ident">dims</span>: <span class="ident">ScreenDims</span>,
}

<span class="kw">impl</span> <span class="ident">DeferDraw</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">batch</span>: <span class="ident">GeomBatch</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Widget</span> {
        <span class="ident">Widget</span>::<span class="ident">new</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">DeferDraw</span> {
            <span class="ident">dims</span>: <span class="ident">batch</span>.<span class="ident">get_dims</span>(),
            <span class="ident">batch</span>,
            <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>::<span class="ident">new</span>(<span class="number">0.0</span>, <span class="number">0.0</span>),
        }))
    }
}

<span class="kw">impl</span> <span class="ident">WidgetImpl</span> <span class="kw">for</span> <span class="ident">DeferDraw</span> {
    <span class="kw">fn</span> <span class="ident">get_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">dims</span>
    }

    <span class="kw">fn</span> <span class="ident">set_pos</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>) {
        <span class="self">self</span>.<span class="ident">top_left</span> <span class="op">=</span> <span class="ident">top_left</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="kw">_</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>, <span class="kw">_</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">WidgetOutput</span>) {
        <span class="macro">unreachable</span><span class="macro">!</span>()
    }

    <span class="kw">fn</span> <span class="ident">draw</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">GfxCtx</span>) {
        <span class="macro">unreachable</span><span class="macro">!</span>()
    }
}
</pre></div>
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