<!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/tools/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.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><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"> <link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"> <link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><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"><img src="../../../brush.svg" width="18" height="18" alt="Pick another theme!"></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" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button> <a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" height="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><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> </pre><div class="example-wrap"><pre class="rust "> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">screenshot</span>; <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">warper</span>; <span class="doccomment">/// Store a cached key/value pair, only recalculating when the key changes.</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Cached</span><span class="op"><</span><span class="ident">K</span>: <span class="ident">PartialEq</span> <span class="op">+</span> <span class="ident">Clone</span>, <span class="ident">V</span><span class="op">></span> { <span class="ident">contents</span>: <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="ident">K</span>, <span class="ident">V</span>)<span class="op">></span>, } <span class="kw">impl</span><span class="op"><</span><span class="ident">K</span>: <span class="ident">PartialEq</span> <span class="op">+</span> <span class="ident">Clone</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">Cached</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">></span> <span class="ident">Cached</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="ident">Cached</span> { <span class="ident">contents</span>: <span class="prelude-val">None</span> } } <span class="doccomment">/// Get the current key.</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">key</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">K</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">contents</span>.<span class="ident">as_ref</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">k</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">k</span>.<span class="ident">clone</span>()) } <span class="doccomment">/// Get the current value.</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">value</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">V</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">contents</span>.<span class="ident">as_ref</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="kw">_</span>, <span class="ident">v</span>)<span class="op">|</span> <span class="ident">v</span>) } <span class="doccomment">/// Update the value if the key has changed.</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">update</span><span class="op"><</span><span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="ident">K</span>) <span class="op">-</span><span class="op">></span> <span class="ident">V</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">K</span><span class="op">></span>, <span class="kw-2">mut</span> <span class="ident">produce_value</span>: <span class="ident">F</span>) { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">new_key</span>) <span class="op">=</span> <span class="ident">key</span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">key</span>() <span class="op">!</span><span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">new_key</span>.<span class="ident">clone</span>()) { <span class="self">self</span>.<span class="ident">contents</span> <span class="op">=</span> <span class="prelude-val">Some</span>((<span class="ident">new_key</span>.<span class="ident">clone</span>(), <span class="ident">produce_value</span>(<span class="ident">new_key</span>))); } } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">contents</span> <span class="op">=</span> <span class="prelude-val">None</span>; } } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clear</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { <span class="self">self</span>.<span class="ident">contents</span> <span class="op">=</span> <span class="prelude-val">None</span>; } } <span class="kw">impl</span><span class="op"><</span><span class="ident">K</span>: <span class="ident">PartialEq</span> <span class="op">+</span> <span class="ident">Clone</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Cached</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-</span><span class="op">></span> <span class="self">Self</span> { <span class="ident">Cached::new</span>() } } </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> <script src="../../../main.js"></script><script src="../../../source-script.js"></script><script src="../../../source-files.js"></script></body></html>