<!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;runner.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>runner.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="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">&#9776;</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" disabled 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>
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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">std::cell::Cell</span>;
<span class="kw">use</span> <span class="ident">std::panic</span>;

<span class="kw">use</span> <span class="ident">image</span>::{<span class="ident">GenericImageView</span>, <span class="ident">Pixel</span>};
<span class="kw">use</span> <span class="ident">instant::Instant</span>;
<span class="kw">use</span> <span class="ident">winit::window::Icon</span>;

<span class="kw">use</span> <span class="ident">abstutil</span>::{<span class="ident">elapsed_seconds</span>, <span class="ident">Timer</span>};
<span class="kw">use</span> <span class="ident">geom::Duration</span>;

<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::app_state::App</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::assets::Assets</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::tools::screenshot::screenshot_everything</span>;
<span class="kw">use</span> <span class="kw">crate</span>::{
    <span class="ident">Canvas</span>, <span class="ident">CanvasSettings</span>, <span class="ident">Event</span>, <span class="ident">EventCtx</span>, <span class="ident">GfxCtx</span>, <span class="ident">Prerender</span>, <span class="ident">SharedAppState</span>, <span class="ident">Style</span>, <span class="ident">Text</span>,
    <span class="ident">UpdateType</span>, <span class="ident">UserInput</span>,
};

<span class="kw">const</span> <span class="ident">UPDATE_FREQUENCY</span>: <span class="ident">std::time::Duration</span> <span class="op">=</span> <span class="ident">std::time::Duration::from_millis</span>(<span class="number">1000</span> <span class="op">/</span> <span class="number">30</span>);
<span class="comment">// Manually enable and then check STDOUT</span>
<span class="kw">const</span> <span class="ident">DEBUG_PERFORMANCE</span>: <span class="ident">bool</span> <span class="op">=</span> <span class="bool-val">false</span>;

<span class="comment">// TODO Rename this GUI or something</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">A</span>: <span class="ident">SharedAppState</span><span class="op">&gt;</span> {
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">app</span>: <span class="ident">App</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span>,
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">canvas</span>: <span class="ident">Canvas</span>,
    <span class="ident">style</span>: <span class="ident">Style</span>,

    <span class="ident">focus_owned_by</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">A</span>: <span class="ident">SharedAppState</span><span class="op">&gt;</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span> {
    <span class="comment">// The bool indicates if the input was actually used.</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-2">mut</span> <span class="ident">ev</span>: <span class="ident">Event</span>, <span class="ident">prerender</span>: <span class="kw-2">&amp;</span><span class="ident">Prerender</span>) <span class="op">-</span><span class="op">&gt;</span> (<span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">UpdateType</span><span class="op">&gt;</span>, <span class="ident">bool</span>) {
        <span class="kw">if</span> <span class="kw">let</span> <span class="ident">Event::MouseWheelScroll</span>(<span class="ident">dx</span>, <span class="ident">dy</span>) <span class="op">=</span> <span class="ident">ev</span> {
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">settings</span>.<span class="ident">invert_scroll</span> {
                <span class="ident">ev</span> <span class="op">=</span> <span class="ident">Event::MouseWheelScroll</span>(<span class="op">-</span><span class="ident">dx</span>, <span class="op">-</span><span class="ident">dy</span>);
            }
        }

        <span class="comment">// Always reset the cursor, unless we&#39;re handling an update event. If we&#39;re hovering on a</span>
        <span class="comment">// button, we&#39;ll discover that by plumbing through the event.</span>
        <span class="kw">if</span> <span class="kw">let</span> <span class="ident">Event::Update</span>(<span class="kw">_</span>) <span class="op">=</span> <span class="ident">ev</span> {
        } <span class="kw">else</span> {
            <span class="ident">prerender</span>
                .<span class="ident">inner</span>
                .<span class="ident">set_cursor_icon</span>(<span class="kw">if</span> <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">drag_canvas_from</span>.<span class="ident">is_some</span>() {
                    <span class="comment">// We haven&#39;t run canvas_movement() yet, so we don&#39;t know if the button has been</span>
                    <span class="comment">// released. Bit of a hack to check this here, but better behavior.</span>
                    <span class="kw">if</span> <span class="macro">matches!</span>(<span class="ident">ev</span>, <span class="ident">Event::LeftMouseButtonUp</span> { .. }) {
                        <span class="ident">winit::window::CursorIcon::Default</span>
                    } <span class="kw">else</span> {
                        <span class="ident">winit::window::CursorIcon::Grabbing</span>
                    }
                } <span class="kw">else</span> {
                    <span class="ident">winit::window::CursorIcon::Default</span>
                });
        }

        <span class="comment">// It&#39;s impossible / very unlikely we&#39;ll grab the cursor in map space before the very first</span>
        <span class="comment">// start_drawing call.</span>
        <span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> <span class="ident">UserInput::new</span>(<span class="ident">ev</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">canvas</span>);

        <span class="comment">// Update some widgetry state that&#39;s stashed in Canvas for sad reasons.</span>
        {
            <span class="kw">if</span> <span class="kw">let</span> <span class="ident">Event::WindowResized</span>(<span class="ident">new_size</span>) <span class="op">=</span> <span class="ident">input</span>.<span class="ident">event</span> {
                <span class="comment">// On platforms like Linux, new_size jumps around when the window is first created.</span>
                <span class="comment">// As a result, if an app has loading screens at startup and doesn&#39;t process all of</span>
                <span class="comment">// these events, new_size may be stuck at an incorrect value during the loading.</span>
                <span class="comment">//</span>
                <span class="comment">// Instead, just use inner_size; it appears correct on all platforms tested.</span>
                <span class="kw">let</span> <span class="ident">inner_size</span> <span class="op">=</span> <span class="ident">prerender</span>.<span class="ident">window_size</span>();
                <span class="macro">trace!</span>(
                    <span class="string">&quot;winit event says the window was resized from {}, {} to {:?}. But inner size \
                     is {:?}, so using that&quot;</span>,
                    <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">window_width</span>,
                    <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">window_height</span>,
                    <span class="ident">new_size</span>,
                    <span class="ident">inner_size</span>
                );
                <span class="ident">prerender</span>.<span class="ident">window_resized</span>(<span class="ident">inner_size</span>);
                <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">window_width</span> <span class="op">=</span> <span class="ident">inner_size</span>.<span class="ident">width</span>;
                <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">window_height</span> <span class="op">=</span> <span class="ident">inner_size</span>.<span class="ident">height</span>;
            }

            <span class="kw">if</span> <span class="kw">let</span> <span class="ident">Event::KeyPress</span>(<span class="ident">key</span>) <span class="op">=</span> <span class="ident">input</span>.<span class="ident">event</span> {
                <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">keys_held</span>.<span class="ident">insert</span>(<span class="ident">key</span>);
            } <span class="kw">else</span> <span class="kw">if</span> <span class="kw">let</span> <span class="ident">Event::KeyRelease</span>(<span class="ident">key</span>) <span class="op">=</span> <span class="ident">input</span>.<span class="ident">event</span> {
                <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">keys_held</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">key</span>);
            }

            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">pt</span>) <span class="op">=</span> <span class="ident">input</span>.<span class="ident">get_moved_mouse</span>() {
                <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">cursor</span> <span class="op">=</span> <span class="ident">pt</span>;
            }

            <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">event</span> <span class="op">=</span><span class="op">=</span> <span class="ident">Event::WindowGainedCursor</span> {
                <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">window_has_cursor</span> <span class="op">=</span> <span class="bool-val">true</span>;
            }
            <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">window_lost_cursor</span>() {
                <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">window_has_cursor</span> <span class="op">=</span> <span class="bool-val">false</span>;
            }
        }

        <span class="kw">match</span> <span class="ident">panic::catch_unwind</span>(<span class="ident">panic::AssertUnwindSafe</span>(<span class="op">|</span><span class="op">|</span> {
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ctx</span> <span class="op">=</span> <span class="ident">EventCtx</span> {
                <span class="ident">fake_mouseover</span>: <span class="bool-val">false</span>,
                <span class="ident">input</span>,
                <span class="ident">canvas</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">canvas</span>,
                <span class="ident">prerender</span>,
                <span class="ident">style</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">style</span>,
                <span class="ident">updates_requested</span>: <span class="macro">vec!</span>[],
                <span class="ident">canvas_movement_called</span>: <span class="bool-val">false</span>,

                <span class="ident">focus_owned_by</span>: <span class="self">self</span>.<span class="ident">focus_owned_by</span>.<span class="ident">take</span>(),
                <span class="comment">// If the widget owning focus doesn&#39;t renew it, then it&#39;ll expire by the end of</span>
                <span class="comment">// this event.</span>
                <span class="ident">next_focus_owned_by</span>: <span class="prelude-val">None</span>,
            };
            <span class="kw">let</span> <span class="ident">started</span> <span class="op">=</span> <span class="ident">Instant::now</span>();
            <span class="self">self</span>.<span class="ident">app</span>.<span class="ident">event</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">ctx</span>);
            <span class="self">self</span>.<span class="ident">focus_owned_by</span> <span class="op">=</span> <span class="ident">ctx</span>.<span class="ident">next_focus_owned_by</span>.<span class="ident">take</span>();
            <span class="kw">if</span> <span class="ident">DEBUG_PERFORMANCE</span> {
                <span class="macro">println!</span>(<span class="string">&quot;- event() took {}s&quot;</span>, <span class="ident">elapsed_seconds</span>(<span class="ident">started</span>));
            }

            <span class="comment">// If the user is dragging the canvas, but then another UI state interrupts things</span>
            <span class="comment">// (like a panel popping up that blocks the canvas) and canvas_movement() isn&#39;t called</span>
            <span class="comment">// for this event, then cancel the drag.</span>
            <span class="kw">if</span> <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">drag_canvas_from</span>.<span class="ident">is_some</span>() <span class="op">&amp;&amp;</span> <span class="op">!</span><span class="ident">ctx</span>.<span class="ident">canvas_movement_called</span> {
                <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">drag_canvas_from</span> <span class="op">=</span> <span class="prelude-val">None</span>;
                <span class="comment">// TODO When the user releases the mouse button, it&#39;ll count as</span>
                <span class="comment">// normal_left_click(). An example why this is a bug:</span>
                <span class="comment">//</span>
                <span class="comment">// 1) Start dragging the map in A/B Street&#39;s sandbox mode</span>
                <span class="comment">// 2) Press escape, bringing up a menu</span>
                <span class="comment">// 3) Release the mouse while hovering off of the panel</span>
                <span class="comment">// This counts as clicking &quot;off the panel&quot; and closes it immediately.</span>
            }

            <span class="comment">// TODO We should always do has_been_consumed, but various hacks prevent this from being</span>
            <span class="comment">// true. For now, just avoid the specific annoying redraw case when a KeyRelease event</span>
            <span class="comment">// is unused.</span>
            <span class="kw">let</span> <span class="ident">input_used</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">ev</span> {
                <span class="ident">Event::KeyRelease</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">ctx</span>.<span class="ident">input</span>.<span class="ident">has_been_consumed</span>(),
                <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> <span class="bool-val">true</span>,
            };
            (<span class="ident">ctx</span>.<span class="ident">updates_requested</span>, <span class="ident">input_used</span>)
        })) {
            <span class="prelude-val">Ok</span>(<span class="ident">pair</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">pair</span>,
            <span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">&gt;</span> {
                <span class="self">self</span>.<span class="ident">app</span>.<span class="ident">shared_app_state</span>.<span class="ident">dump_before_abort</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">canvas</span>);
                <span class="ident">panic::resume_unwind</span>(<span class="ident">err</span>);
            }
        }
    }

    <span class="doccomment">/// Returns naming hint. Logically consumes the number of uploads.</span>
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">draw</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">prerender</span>: <span class="kw-2">&amp;</span><span class="ident">Prerender</span>, <span class="ident">screenshot</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</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">g</span> <span class="op">=</span> <span class="ident">GfxCtx::new</span>(<span class="ident">prerender</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">canvas</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">style</span>, <span class="ident">screenshot</span>);

        <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">start_drawing</span>();

        <span class="kw">let</span> <span class="ident">started</span> <span class="op">=</span> <span class="ident">Instant::now</span>();
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span> <span class="ident">panic::catch_unwind</span>(<span class="ident">panic::AssertUnwindSafe</span>(<span class="op">|</span><span class="op">|</span> {
            <span class="self">self</span>.<span class="ident">app</span>.<span class="ident">draw</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">g</span>);
        })) {
            <span class="self">self</span>.<span class="ident">app</span>.<span class="ident">shared_app_state</span>.<span class="ident">dump_before_abort</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">canvas</span>);
            <span class="ident">panic::resume_unwind</span>(<span class="ident">err</span>);
        }
        <span class="kw">let</span> <span class="ident">naming_hint</span> <span class="op">=</span> <span class="ident">g</span>.<span class="ident">naming_hint</span>.<span class="ident">take</span>();

        <span class="kw">if</span> <span class="ident">DEBUG_PERFORMANCE</span> {
            <span class="macro">println!</span>(
                <span class="string">&quot;----- {} uploads, {} draw calls, {} forks. draw() took {} -----&quot;</span>,
                <span class="ident">g</span>.<span class="ident">get_num_uploads</span>(),
                <span class="ident">g</span>.<span class="ident">num_draw_calls</span>,
                <span class="ident">g</span>.<span class="ident">num_forks</span>,
                <span class="ident">elapsed_seconds</span>(<span class="ident">started</span>)
            );
        }

        <span class="ident">prerender</span>.<span class="ident">inner</span>.<span class="ident">draw_finished</span>(<span class="ident">g</span>.<span class="ident">inner</span>);
        <span class="ident">naming_hint</span>
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">free_memory</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="self">self</span>.<span class="ident">app</span>.<span class="ident">shared_app_state</span>.<span class="ident">free_memory</span>();
    }
}

<span class="doccomment">/// Customize how widgetry works. Most of these settings can&#39;t be changed after starting.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Settings</span> {
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">window_title</span>: <span class="ident">String</span>,
    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>)]</span>
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">root_dom_element_id</span>: <span class="ident">String</span>,
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">assets_base_url</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">assets_are_gzipped</span>: <span class="ident">bool</span>,
    <span class="ident">dump_raw_events</span>: <span class="ident">bool</span>,
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">scale_factor</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>,
    <span class="ident">require_minimum_width</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>,
    <span class="ident">window_icon</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
    <span class="ident">loading_tips</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Text</span><span class="op">&gt;</span>,
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">read_svg</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">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span><span class="op">&gt;</span>,
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">canvas_settings</span>: <span class="ident">CanvasSettings</span>,
}

<span class="kw">impl</span> <span class="ident">Settings</span> {
    <span class="doccomment">/// Specify the title of the window to open.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">window_title</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Settings</span> {
        <span class="ident">Settings</span> {
            <span class="ident">window_title</span>: <span class="ident">window_title</span>.<span class="ident">to_string</span>(),
            <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>)]</span>
            <span class="ident">root_dom_element_id</span>: <span class="string">&quot;widgetry-canvas&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">assets_base_url</span>: <span class="prelude-val">None</span>,
            <span class="ident">assets_are_gzipped</span>: <span class="bool-val">false</span>,
            <span class="ident">dump_raw_events</span>: <span class="bool-val">false</span>,
            <span class="ident">scale_factor</span>: <span class="prelude-val">None</span>,
            <span class="ident">require_minimum_width</span>: <span class="prelude-val">None</span>,
            <span class="ident">window_icon</span>: <span class="prelude-val">None</span>,
            <span class="ident">loading_tips</span>: <span class="prelude-val">None</span>,
            <span class="ident">read_svg</span>: <span class="ident">Box::new</span>(<span class="op">|</span><span class="ident">path</span><span class="op">|</span> {
                <span class="kw">use</span> <span class="ident">std::io::Read</span>;

                <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">file</span> <span class="op">=</span>
                    <span class="ident">std::fs::File::open</span>(<span class="ident">path</span>).<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="macro">panic!</span>(<span class="string">&quot;Couldn&#39;t read {}&quot;</span>, <span class="ident">path</span>));
                <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buffer</span> <span class="op">=</span> <span class="ident">Vec::new</span>();
                <span class="ident">file</span>.<span class="ident">read_to_end</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">buffer</span>)
                    .<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="macro">panic!</span>(<span class="string">&quot;Couldn&#39;t read all of {}&quot;</span>, <span class="ident">path</span>));
                <span class="ident">buffer</span>
            }),
            <span class="ident">canvas_settings</span>: <span class="ident">CanvasSettings::new</span>(),
        }
    }

    <span class="doccomment">/// Log every raw winit event to the DEBUG level.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">dump_raw_events</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
        <span class="macro">assert!</span>(<span class="op">!</span><span class="self">self</span>.<span class="ident">dump_raw_events</span>);
        <span class="self">self</span>.<span class="ident">dump_raw_events</span> <span class="op">=</span> <span class="bool-val">true</span>;
        <span class="self">self</span>
    }

    <span class="doccomment">/// Override the initial HiDPI scale factor from whatever winit initially detects.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">scale_factor</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">scale_factor</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
        <span class="self">self</span>.<span class="ident">scale_factor</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">scale_factor</span>);
        <span class="self">self</span>
    }

    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>)]</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">root_dom_element_id</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">element_id</span>: <span class="ident">String</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
        <span class="self">self</span>.<span class="ident">root_dom_element_id</span> <span class="op">=</span> <span class="ident">element_id</span>;
        <span class="self">self</span>
    }

    <span class="doccomment">/// If the screen width using the monitor&#39;s detected scale factor is below this value (in units</span>
    <span class="doccomment">/// of logical pixels, not physical), then force the scale factor to be 1. If `scale_factor()`</span>
    <span class="doccomment">/// has been called, always use that override. This is helpful for users with HiDPI displays at</span>
    <span class="doccomment">/// low resolutions, for applications designed for screens with some minimum width. Scaling</span>
    <span class="doccomment">/// down UI elements isn&#39;t ideal (since it doesn&#39;t respect the user&#39;s device settings), but</span>
    <span class="doccomment">/// having panels overlap is worse.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">require_minimum_width</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">width</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
        <span class="self">self</span>.<span class="ident">require_minimum_width</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">width</span>);
        <span class="self">self</span>
    }

    <span class="doccomment">/// Sets the window icon. This should be a 32x32 image.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">window_icon</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">path</span>: <span class="ident">String</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
        <span class="self">self</span>.<span class="ident">window_icon</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">path</span>);
        <span class="self">self</span>
    }

    <span class="doccomment">/// Sets the text that&#39;ll appear during long `ctx.loading_screen` calls. You can use this as a</span>
    <span class="doccomment">/// way to entertain your users while they&#39;re waiting.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">loading_tips</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">txt</span>: <span class="ident">Text</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
        <span class="self">self</span>.<span class="ident">loading_tips</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">txt</span>);
        <span class="self">self</span>
    }

    <span class="doccomment">/// When calling `Widget::draw_svg`, `ButtonBuilder::image_path`, and similar, use this function</span>
    <span class="doccomment">/// to transform the filename given to the raw bytes of that SVG file. By default, this just</span>
    <span class="doccomment">/// reads the file normally. You may want to override this to more conveniently locate the</span>
    <span class="doccomment">/// file (transforming a short filename to a full path) or to handle reading files in WASM</span>
    <span class="doccomment">/// (where regular filesystem IO doesn&#39;t work).</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">read_svg</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">function</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">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
        <span class="self">self</span>.<span class="ident">read_svg</span> <span class="op">=</span> <span class="ident">function</span>;
        <span class="self">self</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">assets_base_url</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">String</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
        <span class="self">self</span>.<span class="ident">assets_base_url</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">value</span>);
        <span class="self">self</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">assets_are_gzipped</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
        <span class="self">self</span>.<span class="ident">assets_are_gzipped</span> <span class="op">=</span> <span class="ident">value</span>;
        <span class="self">self</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">canvas_settings</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">settings</span>: <span class="ident">CanvasSettings</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
        <span class="self">self</span>.<span class="ident">canvas_settings</span> <span class="op">=</span> <span class="ident">settings</span>;
        <span class="self">self</span>
    }
}

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">run</span><span class="op">&lt;</span>
    <span class="ident">A</span>: <span class="lifetime">&#39;static</span> <span class="op">+</span> <span class="ident">SharedAppState</span>,
    <span class="ident">F</span>: <span class="ident">FnOnce</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">A</span>, <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident"><span class="kw">crate</span>::app_state::State</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span>),
<span class="op">&gt;</span>(
    <span class="ident">settings</span>: <span class="ident">Settings</span>,
    <span class="ident">make_app</span>: <span class="ident">F</span>,
) <span class="op">-</span><span class="op">&gt;</span> <span class="op">!</span> {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">timer</span> <span class="op">=</span> <span class="ident">Timer::new</span>(<span class="string">&quot;setup widgetry&quot;</span>);
    <span class="kw">let</span> (<span class="ident">prerender_innards</span>, <span class="ident">event_loop</span>) <span class="op">=</span> <span class="ident"><span class="kw">crate</span>::backend::setup</span>(<span class="kw-2">&amp;</span><span class="ident">settings</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">timer</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">path</span>) <span class="op">=</span> <span class="ident">settings</span>.<span class="ident">window_icon</span> {
        <span class="kw">if</span> <span class="op">!</span><span class="macro">cfg!</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>) {
            <span class="kw">let</span> <span class="ident">image</span> <span class="op">=</span> <span class="ident">image::open</span>(<span class="ident">path</span>).<span class="ident">unwrap</span>();
            <span class="kw">let</span> (<span class="ident">width</span>, <span class="ident">height</span>) <span class="op">=</span> <span class="ident">image</span>.<span class="ident">dimensions</span>();
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rgba</span> <span class="op">=</span> <span class="ident">Vec::with_capacity</span>((<span class="ident">width</span> <span class="op">*</span> <span class="ident">height</span>) <span class="kw">as</span> <span class="ident">usize</span> <span class="op">*</span> <span class="number">4</span>);
            <span class="kw">for</span> (<span class="kw">_</span>, <span class="kw">_</span>, <span class="ident">pixel</span>) <span class="kw">in</span> <span class="ident">image</span>.<span class="ident">pixels</span>() {
                <span class="ident">rgba</span>.<span class="ident">extend_from_slice</span>(<span class="kw-2">&amp;</span><span class="ident">pixel</span>.<span class="ident">to_rgba</span>().<span class="number">0</span>);
            }
            <span class="kw">let</span> <span class="ident">icon</span> <span class="op">=</span> <span class="ident">Icon::from_rgba</span>(<span class="ident">rgba</span>, <span class="ident">width</span>, <span class="ident">height</span>).<span class="ident">unwrap</span>();
            <span class="ident">prerender_innards</span>.<span class="ident">set_window_icon</span>(<span class="ident">icon</span>);
        }
    }

    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">style</span> <span class="op">=</span> <span class="ident">Style::light_bg</span>();
    <span class="ident">style</span>.<span class="ident">loading_tips</span> <span class="op">=</span> <span class="ident">settings</span>.<span class="ident">loading_tips</span>.<span class="ident">unwrap_or_else</span>(<span class="ident">Text::new</span>);

    <span class="kw">let</span> <span class="ident">monitor_scale_factor</span> <span class="op">=</span> <span class="ident">prerender_innards</span>.<span class="ident">monitor_scale_factor</span>();
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">prerender</span> <span class="op">=</span> <span class="ident">Prerender</span> {
        <span class="ident">assets</span>: <span class="ident">Assets::new</span>(
            <span class="ident">style</span>.<span class="ident">clone</span>(),
            <span class="ident">settings</span>.<span class="ident">assets_base_url</span>,
            <span class="ident">settings</span>.<span class="ident">assets_are_gzipped</span>,
            <span class="ident">settings</span>.<span class="ident">read_svg</span>,
        ),
        <span class="ident">num_uploads</span>: <span class="ident">Cell::new</span>(<span class="number">0</span>),
        <span class="ident">inner</span>: <span class="ident">prerender_innards</span>,
        <span class="ident">scale_factor</span>: <span class="ident">settings</span>.<span class="ident">scale_factor</span>.<span class="ident">unwrap_or</span>(<span class="ident">monitor_scale_factor</span>),
    };
    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">min_width</span>) <span class="op">=</span> <span class="ident">settings</span>.<span class="ident">require_minimum_width</span> {
        <span class="kw">let</span> <span class="ident">initial_size</span> <span class="op">=</span> <span class="ident">prerender</span>.<span class="ident">window_size</span>();
        <span class="kw">if</span> <span class="ident">initial_size</span>.<span class="ident">width</span> <span class="op">&lt;</span> <span class="ident">min_width</span> <span class="op">&amp;&amp;</span> <span class="ident">settings</span>.<span class="ident">scale_factor</span>.<span class="ident">is_none</span>() {
            <span class="macro">warn!</span>(
                <span class="string">&quot;Monitor scale factor is {}, screen window is {}, but the application requires \
                 {}. Overriding the scale factor to 1.&quot;</span>,
                <span class="ident">monitor_scale_factor</span>, <span class="ident">initial_size</span>.<span class="ident">width</span>, <span class="ident">min_width</span>
            );
            <span class="ident">prerender</span>.<span class="ident">scale_factor</span> <span class="op">=</span> <span class="number">1.0</span>;
        }
    }

    <span class="kw">let</span> <span class="ident">initial_size</span> <span class="op">=</span> <span class="ident">prerender</span>.<span class="ident">window_size</span>();
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">canvas</span> <span class="op">=</span> <span class="ident">Canvas::new</span>(<span class="ident">initial_size</span>, <span class="ident">settings</span>.<span class="ident">canvas_settings</span>);
    <span class="ident">prerender</span>.<span class="ident">window_resized</span>(<span class="ident">initial_size</span>);

    <span class="ident">timer</span>.<span class="ident">start</span>(<span class="string">&quot;setup app&quot;</span>);
    <span class="kw">let</span> (<span class="ident">shared_app_state</span>, <span class="ident">states</span>) <span class="op">=</span> <span class="ident">make_app</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span> {
        <span class="ident">fake_mouseover</span>: <span class="bool-val">true</span>,
        <span class="ident">input</span>: <span class="ident">UserInput::new</span>(<span class="ident">Event::NoOp</span>, <span class="kw-2">&amp;</span><span class="ident">canvas</span>),
        <span class="ident">canvas</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">canvas</span>,
        <span class="ident">prerender</span>: <span class="kw-2">&amp;</span><span class="ident">prerender</span>,
        <span class="ident">style</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">style</span>,
        <span class="ident">updates_requested</span>: <span class="macro">vec!</span>[],
        <span class="ident">canvas_movement_called</span>: <span class="bool-val">false</span>,
        <span class="ident">focus_owned_by</span>: <span class="prelude-val">None</span>,
        <span class="ident">next_focus_owned_by</span>: <span class="prelude-val">None</span>,
    });
    <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="string">&quot;setup app&quot;</span>);
    <span class="kw">let</span> <span class="ident">app</span> <span class="op">=</span> <span class="ident">App</span> {
        <span class="ident">states</span>,
        <span class="ident">shared_app_state</span>,
    };
    <span class="ident">timer</span>.<span class="ident">done</span>();

    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">state</span> <span class="op">=</span> <span class="ident">State</span> {
        <span class="ident">app</span>,
        <span class="ident">canvas</span>,
        <span class="ident">style</span>,
        <span class="ident">focus_owned_by</span>: <span class="prelude-val">None</span>,
    };

    <span class="kw">let</span> <span class="ident">dump_raw_events</span> <span class="op">=</span> <span class="ident">settings</span>.<span class="ident">dump_raw_events</span>;

    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">running</span> <span class="op">=</span> <span class="bool-val">true</span>;
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">last_update</span> <span class="op">=</span> <span class="ident">Instant::now</span>();
    <span class="comment">// The user will not manage to click immediately after the window opens, so this initial value is simpler than an `Option&lt;Instant&gt;`</span>
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">previous_left_click_at</span> <span class="op">=</span> <span class="ident">Instant::now</span>();
    <span class="ident">event_loop</span>.<span class="ident">run</span>(<span class="kw">move</span> <span class="op">|</span><span class="ident">event</span>, <span class="kw">_</span>, <span class="ident">control_flow</span><span class="op">|</span> {
        <span class="kw">if</span> <span class="ident">dump_raw_events</span> {
            <span class="macro">debug!</span>(<span class="string">&quot;Event: {:?}&quot;</span>, <span class="ident">event</span>);
        }
        <span class="kw">let</span> <span class="ident">ev</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">event</span> {
            <span class="ident">winit::event::Event::WindowEvent</span> {
                <span class="ident">event</span>: <span class="ident">winit::event::WindowEvent::CloseRequested</span>,
                ..
            } <span class="op">=</span><span class="op">&gt;</span> {
                <span class="comment">// ControlFlow::Exit cleanly shuts things down, meaning on larger maps, lots of</span>
                <span class="comment">// GPU stuff is dropped. Better to just abort violently and let the OS clean</span>
                <span class="comment">// up.</span>
                <span class="ident">state</span>.<span class="ident">app</span>.<span class="ident">shared_app_state</span>.<span class="ident">before_quit</span>(<span class="kw-2">&amp;</span><span class="ident">state</span>.<span class="ident">canvas</span>);
                <span class="ident">std::process::exit</span>(<span class="number">0</span>);
            }
            <span class="ident">winit::event::Event::WindowEvent</span> { <span class="ident">event</span>, .. } <span class="op">=</span><span class="op">&gt;</span> {
                <span class="kw">let</span> <span class="ident">scale_factor</span> <span class="op">=</span> <span class="ident">prerender</span>.<span class="ident">get_scale_factor</span>();
                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">ev</span>) <span class="op">=</span>
                    <span class="ident">Event::from_winit_event</span>(<span class="ident">event</span>, <span class="ident">scale_factor</span>, <span class="ident">previous_left_click_at</span>)
                {
                    <span class="ident">ev</span>
                } <span class="kw">else</span> {
                    <span class="comment">// Don&#39;t touch control_flow if we got an irrelevant event</span>
                    <span class="kw">return</span>;
                }
            }
            <span class="ident">winit::event::Event::RedrawRequested</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">&gt;</span> {
                <span class="ident">state</span>.<span class="ident">draw</span>(<span class="kw-2">&amp;</span><span class="ident">prerender</span>, <span class="bool-val">false</span>);
                <span class="ident">prerender</span>.<span class="ident">num_uploads</span>.<span class="ident">set</span>(<span class="number">0</span>);
                <span class="kw">return</span>;
            }
            <span class="ident">winit::event::Event::MainEventsCleared</span> <span class="op">=</span><span class="op">&gt;</span> {
                <span class="comment">// We might&#39;ve switched to InputOnly after the WaitUntil was requested.</span>
                <span class="kw">if</span> <span class="ident">running</span> {
                    <span class="ident">Event::Update</span>(<span class="ident">Duration::realtime_elapsed</span>(<span class="ident">last_update</span>))
                } <span class="kw">else</span> {
                    <span class="kw">return</span>;
                }
            }
            <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> {
                <span class="kw">return</span>;
            }
        };

        <span class="comment">// We want a max of UPDATE_FREQUENCY between updates, so measure the update time before</span>
        <span class="comment">// doing the work (which takes time).</span>
        <span class="kw">match</span> <span class="ident">ev</span> {
            <span class="ident">Event::Update</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">&gt;</span> {
                <span class="ident">last_update</span> <span class="op">=</span> <span class="ident">Instant::now</span>();
                <span class="kw-2">*</span><span class="ident">control_flow</span> <span class="op">=</span>
                    <span class="ident">winit::event_loop::ControlFlow::WaitUntil</span>(<span class="ident">Instant::now</span>() <span class="op">+</span> <span class="ident">UPDATE_FREQUENCY</span>);
            }
            <span class="ident">Event::LeftMouseButtonUp</span> {
                <span class="ident">is_double_click</span>: <span class="bool-val">false</span>,
            } <span class="op">=</span><span class="op">&gt;</span> {
                <span class="ident">previous_left_click_at</span> <span class="op">=</span> <span class="ident">Instant::now</span>();
            }
            <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> {}
        }

        <span class="kw">let</span> (<span class="kw-2">mut</span> <span class="ident">updates</span>, <span class="ident">input_used</span>) <span class="op">=</span> <span class="ident">state</span>.<span class="ident">event</span>(<span class="ident">ev</span>, <span class="kw-2">&amp;</span><span class="ident">prerender</span>);

        <span class="kw">if</span> <span class="ident">input_used</span> {
            <span class="ident">prerender</span>.<span class="ident">request_redraw</span>();
        }

        <span class="kw">if</span> <span class="ident">updates</span>.<span class="ident">is_empty</span>() {
            <span class="ident">updates</span>.<span class="ident">push</span>(<span class="ident">UpdateType::InputOnly</span>);
        }
        <span class="kw">for</span> <span class="ident">update</span> <span class="kw">in</span> <span class="ident">updates</span> {
            <span class="kw">match</span> <span class="ident">update</span> {
                <span class="ident">UpdateType::InputOnly</span> <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="ident">running</span> <span class="op">=</span> <span class="bool-val">false</span>;
                    <span class="kw-2">*</span><span class="ident">control_flow</span> <span class="op">=</span> <span class="ident">winit::event_loop::ControlFlow::Wait</span>;
                }
                <span class="ident">UpdateType::Game</span> <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="comment">// If we just unpaused, then don&#39;t act as if lots of time has passed.</span>
                    <span class="kw">if</span> <span class="op">!</span><span class="ident">running</span> {
                        <span class="ident">last_update</span> <span class="op">=</span> <span class="ident">Instant::now</span>();
                        <span class="kw-2">*</span><span class="ident">control_flow</span> <span class="op">=</span> <span class="ident">winit::event_loop::ControlFlow::WaitUntil</span>(
                            <span class="ident">Instant::now</span>() <span class="op">+</span> <span class="ident">UPDATE_FREQUENCY</span>,
                        );
                    }

                    <span class="ident">running</span> <span class="op">=</span> <span class="bool-val">true</span>;
                }
                <span class="ident">UpdateType::Pan</span> <span class="op">=</span><span class="op">&gt;</span> {}
                <span class="ident">UpdateType::ScreenCaptureEverything</span> {
                    <span class="ident">dir</span>,
                    <span class="ident">zoom</span>,
                    <span class="ident">dims</span>,
                    <span class="ident">leaflet_naming</span>,
                } <span class="op">=</span><span class="op">&gt;</span> {
                    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span> <span class="ident">screenshot_everything</span>(
                        <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">state</span>,
                        <span class="kw-2">&amp;</span><span class="ident">dir</span>,
                        <span class="kw-2">&amp;</span><span class="ident">prerender</span>,
                        <span class="ident">zoom</span>,
                        <span class="ident">dims</span>,
                        <span class="ident">leaflet_naming</span>,
                    ) {
                        <span class="macro">error!</span>(<span class="string">&quot;Couldn&#39;t screenshot everything: {}&quot;</span>, <span class="ident">err</span>);
                    }
                }
            }
        }
    });
}
</code></pre></div>
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