<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `widgetry&#x2F;src&#x2F;widgets&#x2F;containers.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>containers.rs - source</title><link rel="stylesheet" type="text/css" href="../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../light.css"  id="themeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../../ayu.css" disabled ><script id="default-settings" ></script><script src="../../../storage.js"></script><script src="../../../crates.js"></script><script defer src="../../../main.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script>
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</pre><pre class="rust"><code><span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">EventCtx</span>, <span class="ident">GfxCtx</span>, <span class="ident">Outcome</span>, <span class="ident">ScreenDims</span>, <span class="ident">ScreenPt</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">Nothing</span> {}

<span class="kw">impl</span> <span class="ident">WidgetImpl</span> <span class="kw">for</span> <span class="ident">Nothing</span> {
    <span class="kw">fn</span> <span class="ident">get_dims</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">ScreenDims</span> {
        <span class="macro">unreachable!</span>()
    }

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

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

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Container</span> {
    <span class="comment">// false means column</span>
    <span class="kw">pub</span> <span class="ident">is_row</span>: <span class="ident">bool</span>,
    <span class="kw">pub</span> <span class="ident">members</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Widget</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span> <span class="ident">Container</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">is_row</span>: <span class="ident">bool</span>, <span class="kw-2">mut</span> <span class="ident">members</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Widget</span><span class="op">&gt;</span>) -&gt; <span class="ident">Container</span> {
        <span class="ident">members</span>.<span class="ident">retain</span>(<span class="op">|</span><span class="ident">w</span><span class="op">|</span> <span class="op">!</span><span class="ident">w</span>.<span class="ident">widget</span>.<span class="ident">is</span>::<span class="op">&lt;</span><span class="ident">Nothing</span><span class="op">&gt;</span>());
        <span class="ident">Container</span> { <span class="ident">is_row</span>, <span class="ident">members</span> }
    }
}

<span class="kw">impl</span> <span class="ident">WidgetImpl</span> <span class="kw">for</span> <span class="ident">Container</span> {
    <span class="kw">fn</span> <span class="ident">get_dims</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">ScreenDims</span> {
        <span class="comment">// TODO This impl isn&#39;t correct, but it works for the one use case of</span>
        <span class="comment">// get_width_for_forcing.</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">width</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">0.0</span>;
        <span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">members</span> {
            <span class="ident">width</span> <span class="op">=</span> <span class="ident">width</span>.<span class="ident">max</span>(<span class="ident">x</span>.<span class="ident">get_width_for_forcing</span>());
        }
        <span class="ident">ScreenDims::new</span>(<span class="ident">width</span>, <span class="number">0.0</span>)
    }
    <span class="kw">fn</span> <span class="ident">set_pos</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">_top_left</span>: <span class="ident">ScreenPt</span>) {
        <span class="macro">unreachable!</span>()
    }

    <span class="kw">fn</span> <span class="ident">event</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>, <span class="ident">output</span>: <span class="kw-2">&amp;mut</span> <span class="ident">WidgetOutput</span>) {
        <span class="kw">for</span> <span class="ident">w</span> <span class="kw">in</span> <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">members</span> {
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">id</span>) <span class="op">=</span> <span class="ident">ctx</span>.<span class="ident">focus_owned_by</span>.<span class="ident">as_ref</span>() {
                <span class="comment">// Container is the only place that needs to actually enforce focus. If a Panel</span>
                <span class="comment">// consists of only one top-level widget, then there&#39;s nothing else to conflict</span>
                <span class="comment">// with focus. And in the common case, we have a tree of Containers, with</span>
                <span class="comment">// non-Container leaves.</span>
                <span class="kw">if</span> <span class="ident">w</span>.<span class="ident">id</span>.<span class="ident">as_ref</span>() <span class="op">!</span><span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">id</span>) <span class="op">&amp;&amp;</span> <span class="op">!</span><span class="ident">w</span>.<span class="ident">widget</span>.<span class="ident">is</span>::<span class="op">&lt;</span><span class="ident">Container</span><span class="op">&gt;</span>() {
                    <span class="kw">continue</span>;
                }
            }
            <span class="ident">w</span>.<span class="ident">widget</span>.<span class="ident">event</span>(<span class="ident">ctx</span>, <span class="ident">output</span>);
            <span class="comment">// If the widget produced an outcome, short-circuit.</span>
            <span class="kw">if</span> <span class="op">!</span><span class="macro">matches!</span>(<span class="ident">output</span>.<span class="ident">outcome</span>, <span class="ident">Outcome::Nothing</span>) {
                <span class="kw">return</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;mut</span> <span class="ident">GfxCtx</span>) {
        <span class="kw">for</span> <span class="ident">w</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">members</span> {
            <span class="ident">w</span>.<span class="ident">draw</span>(<span class="ident">g</span>);
        }
    }
}
</code></pre></div>
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