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<!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>Emigui – 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: #000000;
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}
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html,
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body {
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overflow: hidden;
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}
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</style>
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</head>
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<body>
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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 paint_gui(canvas, input) {
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if (g_wasm_app === null) {
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g_wasm_app = wasm_bindgen.new_webgl_gui("canvas", pixels_per_point());
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}
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let output = JSON.parse(wasm_bindgen.run_gui(g_wasm_app, JSON.stringify(input)));
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// console.log(`output: ${JSON.stringify(output)}`);
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document.body.style.cursor = from_emigui_cursor(output.cursor_icon);
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if (output.open_url) {
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window.open(output.open_url, "_self");
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}
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}
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function from_emigui_cursor(cursor) {
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if (cursor == "no_drop") { return "no-drop"; }
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else if (cursor == "not_allowed") { return "not-allowed"; }
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else if (cursor == "resize_nw_se") { return "nwse-resize"; }
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else if (cursor == "pointing_hand") { return "pointer"; }
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// TODO: more
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else {
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// default, help, pointer, progress, wait, cell, crosshair, text, alias, copy, move, grab, grabbing,
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return cursor;
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}
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}
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// ----------------------------------------------------------------------------
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var g_mouse_pos = null;
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var g_mouse_down = false;
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var g_is_touch = false;
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var g_scroll_delta_x = 0;
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var g_scroll_delta_y = 0;
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function pixels_per_point() {
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// return 1.0;
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return window.devicePixelRatio || 1.0;
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}
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function auto_resize_canvas(canvas) {
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canvas.style.width = window.innerWidth + "px";
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canvas.style.height = window.innerHeight + "px";
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canvas.width = window.innerWidth * pixels_per_point();
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canvas.height = window.innerHeight * pixels_per_point();
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}
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function get_input(canvas) {
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var input = {
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mouse_down: g_mouse_down,
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mouse_pos: g_mouse_pos,
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scroll_delta: { x: -g_scroll_delta_x, y: -g_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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};
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g_scroll_delta_x = 0;
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g_scroll_delta_y = 0;
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return input;
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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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var canvas = document.getElementById("canvas");
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auto_resize_canvas(canvas);
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paint_gui(canvas, get_input(canvas));
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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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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 (g_is_touch) { return; }
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g_mouse_pos = mouse_pos_from_event(canvas, event);
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g_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 (g_is_touch) { return; }
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g_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 (g_is_touch) { return; }
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g_mouse_pos = mouse_pos_from_event(canvas, event);
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g_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 (g_is_touch) { return; }
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g_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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g_is_touch = true;
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g_mouse_pos = { x: event.touches[0].pageX, y: event.touches[0].pageY };
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g_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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g_is_touch = true;
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g_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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g_is_touch = true;
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g_mouse_down = false; // First release mouse to click...
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paint();
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g_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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g_scroll_delta_x += event.deltaX;
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g_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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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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paint_and_schedule();
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}
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</script>
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<!-- TODO: make this cover the entire screen, with resize and all -->
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<canvas id="canvas" width="1024" height="1024"></canvas>
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</body>
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</html>
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