<!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/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 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id="482">482</span> <span id="483">483</span> <span id="484">484</span> <span id="485">485</span> <span id="486">486</span> <span id="487">487</span> <span id="488">488</span> <span id="489">489</span> <span id="490">490</span> <span id="491">491</span> <span id="492">492</span> <span id="493">493</span> <span id="494">494</span> <span id="495">495</span> <span id="496">496</span> <span id="497">497</span> </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"><</span><span class="ident">A</span>: <span class="ident">SharedAppState</span><span class="op">></span> { <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">app</span>: <span class="ident">App</span><span class="op"><</span><span class="ident">A</span><span class="op">></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"><</span><span class="ident">String</span><span class="op">></span>, } <span class="kw">impl</span><span class="op"><</span><span class="ident">A</span>: <span class="ident">SharedAppState</span><span class="op">></span> <span class="ident">State</span><span class="op"><</span><span class="ident">A</span><span class="op">></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">&</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">&</span><span class="ident">Prerender</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">Vec</span><span class="op"><</span><span class="ident">UpdateType</span><span class="op">></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're handling an update event. If we're hovering on a</span> <span class="comment">// button, we'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't run canvas_movement() yet, so we don'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's impossible / very unlikely we'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">&</span><span class="self">self</span>.<span class="ident">canvas</span>); <span class="comment">// Update some widgetry state that'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'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">"winit event says the window was resized from {}, {} to {:?}. But inner size \ is {:?}, so using that"</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">&</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">&</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">&</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't renew it, then it'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">&</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">"- event() took {}s"</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'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">&&</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'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'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 "off the panel" 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">></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">></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">></span> <span class="ident">pair</span>, <span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">></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">&</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">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">prerender</span>: <span class="kw-2">&</span><span class="ident">Prerender</span>, <span class="ident">screenshot</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">></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">&</span><span class="self">self</span>.<span class="ident">canvas</span>, <span class="kw-2">&</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">&</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">&</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">"----- {} uploads, {} draw calls, {} forks. draw() took {} -----"</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">&</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'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">"wasm32"</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"><</span><span class="ident">String</span><span class="op">></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"><</span><span class="ident">f64</span><span class="op">></span>, <span class="ident">require_minimum_width</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">f64</span><span class="op">></span>, <span class="ident">window_icon</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>, <span class="ident">loading_tips</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Text</span><span class="op">></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"><</span><span class="kw">dyn</span> <span class="ident">Fn</span>(<span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span><span class="op">></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">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></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">"wasm32"</span>)]</span> <span class="ident">root_dom_element_id</span>: <span class="string">"widgetry-canvas"</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">"Couldn't read {}"</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">&</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">"Couldn't read all of {}"</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">></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">></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">"wasm32"</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">></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'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't ideal (since it doesn't respect the user'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">></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">></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'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'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">></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'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"><</span><span class="kw">dyn</span> <span class="ident">Fn</span>(<span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span><span class="op">></span>) <span class="op">-</span><span class="op">></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">></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">></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">></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"><</span> <span class="ident">A</span>: <span class="lifetime">'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">&</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">A</span>, <span class="ident">Vec</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident"><span class="kw">crate</span>::app_state::State</span><span class="op"><</span><span class="ident">A</span><span class="op">></span><span class="op">></span><span class="op">></span>), <span class="op">></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">></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">"setup widgetry"</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">&</span><span class="ident">settings</span>, <span class="kw-2">&</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">"wasm32"</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">&</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"><</span> <span class="ident">min_width</span> <span class="op">&&</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">"Monitor scale factor is {}, screen window is {}, but the application requires \ {}. Overriding the scale factor to 1."</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">"setup app"</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">&</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">&</span><span class="ident">canvas</span>), <span class="ident">canvas</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">canvas</span>, <span class="ident">prerender</span>: <span class="kw-2">&</span><span class="ident">prerender</span>, <span class="ident">style</span>: <span class="kw-2">&</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">"setup app"</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<Instant>`</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">"Event: {:?}"</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">></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">&</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">></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'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">></span> { <span class="ident">state</span>.<span class="ident">draw</span>(<span class="kw-2">&</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">></span> { <span class="comment">// We might'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">></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">></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">></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">></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">&</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">></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">></span> { <span class="comment">// If we just unpaused, then don'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">></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">></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">&</span><span class="kw-2">mut</span> <span class="ident">state</span>, <span class="kw-2">&</span><span class="ident">dir</span>, <span class="kw-2">&</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">"Couldn't screenshot everything: {}"</span>, <span class="ident">err</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> <script src="../../main.js"></script><script src="../../source-script.js"></script><script src="../../source-files.js"></script> </body></html>