284 lines
11 KiB
HTML
284 lines
11 KiB
HTML
<!DOCTYPE html>
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<!-- Disable zooming: -->
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
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<!-- TODO: read https://www.html5rocks.com/en/mobile/mobifying/#toc-meta-viewport -->
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<head>
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<title>Egui – An experimental immediate mode GUI written in Rust</title>
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<style>
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html {
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/* Remove touch delay: */
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touch-action: manipulation;
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}
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body {
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background: #101010;
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}
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/* Allow canvas to fill entire web page: */
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html,
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body {
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overflow: hidden;
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margin: 0 !important;
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padding: 0 !important;
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}
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</style>
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</head>
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<body>
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<!-- We later make this cover the entire screen even when resized -->
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<canvas id="canvas" width="1024" height="1024"></canvas>
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<script>
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// The `--no-modules`-generated JS from `wasm-bindgen` attempts to use
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// `WebAssembly.instantiateStreaming` to instantiate the wasm module,
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// but this doesn't work with `file://` urls. This example is frequently
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// viewed by simply opening `index.html` in a browser (with a `file://`
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// url), so it would fail if we were to call this function!
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//
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// Work around this for now by deleting the function to ensure that the
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// `no_modules.js` script doesn't have access to it. You won't need this
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// hack when deploying over HTTP.
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delete WebAssembly.instantiateStreaming;
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</script>
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<!-- this is the JS generated by the `wasm-bindgen` CLI tool -->
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<script src="example_wasm.js"></script>
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<script>
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// we'll defer our execution until the wasm is ready to go
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// here we tell bindgen the path to the wasm file so it can start
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// initialization and return to us a promise when it's done
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wasm_bindgen("./example_wasm_bg.wasm")
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.then(on_wasm_loaded)["catch"](console.error);
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// ----------------------------------------------------------------------------
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var g_wasm_app = null;
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function egui_state() {
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window.g_egui_state = window.g_egui_state || {
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mouse_pos: null,
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mouse_down: false,
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is_touch: false, // we don't know yet
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scroll_delta_x: 0,
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scroll_delta_y: 0,
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events: [],
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};
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return window.g_egui_state;
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};
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// ----------------------------------------------------------------------------
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function pixels_per_point() {
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return window.devicePixelRatio || 1.0;
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}
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function get_egui_input() {
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let state = egui_state();
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var input = {
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mouse_down: state.mouse_down,
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mouse_pos: state.mouse_pos,
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scroll_delta: { x: -state.scroll_delta_x, y: -state.scroll_delta_y }, // TODO: standardize scroll direction
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screen_size: { x: window.innerWidth, y: window.innerHeight },
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pixels_per_point: pixels_per_point(),
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time: window.performance.now() / 1000.0,
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seconds_since_midnight: seconds_since_midnight(),
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events: state.events,
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};
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state.scroll_delta_x = 0;
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state.scroll_delta_y = 0;
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state.events = [];
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return input;
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}
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function seconds_since_midnight() {
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var d = new Date();
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return (d.getHours() * 60.0 + d.getMinutes()) * 60.0 + d.getSeconds() + 1e-3 * d.getMilliseconds();
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}
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function mouse_pos_from_event(canvas, event) {
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var rect = canvas.getBoundingClientRect();
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return {
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x: event.clientX - rect.left,
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y: event.clientY - rect.top
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};
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}
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// If true, paint at full framerate always.
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// If false, only paint on input.
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// TODO: if this is turned off we must turn off animations too (which hasn't been implemented yet).
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const ANIMATION_FRAME = true;
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function paint() {
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wasm_bindgen.resize_to_screen_size("canvas");
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if (g_wasm_app === null) {
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g_wasm_app = wasm_bindgen.new_webgl_gui("canvas");
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}
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let input = get_egui_input();
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wasm_bindgen.run_gui(g_wasm_app, JSON.stringify(input));
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}
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function paint_and_schedule() {
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paint();
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if (ANIMATION_FRAME) {
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window.requestAnimationFrame(paint_and_schedule);
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}
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}
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function on_wasm_loaded() {
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var canvas = document.getElementById("canvas");
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console.assert(canvas);
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install_canvas_events(canvas, paint);
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install_document_events(paint);
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paint_and_schedule();
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}
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function install_document_events(paint) {
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var invalidate = function () {
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if (!ANIMATION_FRAME) {
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paint();
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}
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};
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document.addEventListener("keydown", function (event) {
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var key = translate_key(event.key);
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if (key) {
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egui_state().events.push({ "key": { "key": key, 'pressed': true } });
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} else {
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egui_state().events.push({ "text": event.key });
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}
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invalidate();
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// event.stopPropagation();
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// event.preventDefault();
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});
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// document.addEventListener("keypress", (event)=>{
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// console.log(`keypress: ${event.key} ${JSON.stringify(event)}`);
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// invalidate();
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// event.stopPropagation();
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// event.preventDefault();
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// });
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document.addEventListener("keyup", function (event) {
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// console.log(`keyup: ${event.key} ${JSON.stringify(event)}`);
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var key = translate_key(event.key);
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if (key) {
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egui_state().events.push({ "key": { "key": key, 'pressed': false } });
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}
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invalidate();
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// event.stopPropagation();
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// event.preventDefault();
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});
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if (!ANIMATION_FRAME) {
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window.addEventListener("load", invalidate);
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window.addEventListener("pagehide", invalidate);
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window.addEventListener("pageshow", invalidate);
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window.addEventListener("resize", invalidate);
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}
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}
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function install_canvas_events(canvas, paint) {
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var invalidate = function () {
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if (!ANIMATION_FRAME) {
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paint();
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}
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};
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canvas.addEventListener("mousedown", function (event) {
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if (egui_state().is_touch) { return; }
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egui_state().mouse_pos = mouse_pos_from_event(canvas, event);
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egui_state().mouse_down = true;
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invalidate();
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event.stopPropagation();
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event.preventDefault();
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});
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canvas.addEventListener("mousemove", function (event) {
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if (egui_state().is_touch) { return; }
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egui_state().mouse_pos = mouse_pos_from_event(canvas, event);
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invalidate();
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event.stopPropagation();
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event.preventDefault();
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});
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canvas.addEventListener("mouseup", function (event) {
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if (egui_state().is_touch) { return; }
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egui_state().mouse_pos = mouse_pos_from_event(canvas, event);
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egui_state().mouse_down = false;
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invalidate();
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event.stopPropagation();
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event.preventDefault();
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});
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canvas.addEventListener("mouseleave", function (event) {
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if (egui_state().is_touch) { return; }
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egui_state().mouse_pos = null;
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invalidate();
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event.stopPropagation();
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event.preventDefault();
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});
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canvas.addEventListener("touchstart", function (event) {
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egui_state().is_touch = true;
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egui_state().mouse_pos = { x: event.touches[0].pageX, y: event.touches[0].pageY };
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egui_state().mouse_down = true;
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invalidate();
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event.stopPropagation();
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event.preventDefault();
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});
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canvas.addEventListener("touchmove", function (event) {
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egui_state().is_touch = true;
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egui_state().mouse_pos = { x: event.touches[0].pageX, y: event.touches[0].pageY };
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invalidate();
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event.stopPropagation();
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event.preventDefault();
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});
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canvas.addEventListener("touchend", function (event) {
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egui_state().is_touch = true;
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egui_state().mouse_down = false; // First release mouse to click...
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paint(); // ...do the clicking...
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egui_state().mouse_pos = null; // ...remove hover effect
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invalidate();
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event.stopPropagation();
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event.preventDefault();
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});
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canvas.addEventListener("wheel", function (event) {
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egui_state().scroll_delta_x += event.deltaX;
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egui_state().scroll_delta_y += event.deltaY;
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invalidate();
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event.stopPropagation();
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event.preventDefault();
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});
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}
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function translate_key(key) {
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if (key == "Alt") { return "alt"; }
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if (key == "Backspace") { return "backspace"; }
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if (key == "Control") { return "control"; }
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if (key == "Delete") { return "delete"; }
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if (key == "ArrowDown") { return "down"; }
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if (key == "End") { return "end"; }
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if (key == "Escape") { return "escape"; }
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if (key == "Home") { return "home"; }
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if (key == "Help") { return "insert"; }
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if (key == "ArrowLeft") { return "left"; }
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if (key == "Meta") { return "logo"; }
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if (key == "PageDown") { return "page_down"; }
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if (key == "PageUp") { return "page_up"; }
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if (key == "Enter") { return "return"; }
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if (key == "ArrowRight") { return "right"; }
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if (key == "Shift") { return "shift"; }
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// if (key == " ") { return "space"; }
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if (key == "Tab") { return "tab"; }
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if (key == "ArrowUp") { return "up"; }
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return null;
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}
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</script>
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</body>
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</html>
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