<!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/src/widgets/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> <noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"><style type="text/css">#crate-search{background-image:url("../../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">☰</div><a href='../../../widgetry/index.html'><div class='logo-container rust-logo'><img src='../../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../../../wheel.svg"></a></div></form></nav><section id="main" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1"> 1</span> <span id="2"> 2</span> <span id="3"> 3</span> <span id="4"> 4</span> <span id="5"> 5</span> <span id="6"> 6</span> <span id="7"> 7</span> <span id="8"> 8</span> <span id="9"> 9</span> <span id="10">10</span> <span id="11">11</span> <span id="12">12</span> <span id="13">13</span> <span id="14">14</span> <span id="15">15</span> <span id="16">16</span> <span id="17">17</span> <span id="18">18</span> <span id="19">19</span> <span id="20">20</span> <span id="21">21</span> <span id="22">22</span> <span id="23">23</span> <span id="24">24</span> <span id="25">25</span> <span id="26">26</span> <span id="27">27</span> <span id="28">28</span> <span id="29">29</span> <span id="30">30</span> <span id="31">31</span> <span id="32">32</span> <span id="33">33</span> <span id="34">34</span> <span id="35">35</span> <span id="36">36</span> <span id="37">37</span> <span id="38">38</span> <span id="39">39</span> <span id="40">40</span> <span id="41">41</span> <span id="42">42</span> <span id="43">43</span> <span id="44">44</span> <span id="45">45</span> <span id="46">46</span> <span id="47">47</span> <span id="48">48</span> <span id="49">49</span> <span id="50">50</span> <span id="51">51</span> <span id="52">52</span> <span id="53">53</span> <span id="54">54</span> <span id="55">55</span> <span id="56">56</span> <span id="57">57</span> <span id="58">58</span> <span id="59">59</span> <span id="60">60</span> <span id="61">61</span> <span id="62">62</span> <span id="63">63</span> <span id="64">64</span> <span id="65">65</span> <span id="66">66</span> <span id="67">67</span> <span id="68">68</span> <span id="69">69</span> <span id="70">70</span> <span id="71">71</span> <span id="72">72</span> <span id="73">73</span> </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">&</span><span class="self">self</span>) -> <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">&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">&mut</span> <span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&mut</span> <span class="ident">EventCtx</span>, <span class="kw">_</span>: <span class="kw-2">&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">&</span><span class="self">self</span>, <span class="ident">_g</span>: <span class="kw-2">&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"><</span><span class="ident">Widget</span><span class="op">></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"><</span><span class="ident">Widget</span><span class="op">></span>) -> <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"><</span><span class="ident">Nothing</span><span class="op">></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">&</span><span class="self">self</span>) -> <span class="ident">ScreenDims</span> { <span class="comment">// TODO This impl isn'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">&</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">&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">&mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&mut</span> <span class="ident">EventCtx</span>, <span class="ident">output</span>: <span class="kw-2">&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">&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'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">&&</span> <span class="op">!</span><span class="ident">w</span>.<span class="ident">widget</span>.<span class="ident">is</span>::<span class="op"><</span><span class="ident">Container</span><span class="op">></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">&</span><span class="self">self</span>, <span class="ident">g</span>: <span class="kw-2">&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">&</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> </section><section id="search" class="content hidden"></section><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="widgetry" data-search-index-js="../../../search-index.js" data-search-js="../../../search.js"></div> </body></html>