mirror of
https://github.com/emilk/egui.git
synced 2026-08-30 21:30:03 -04:00
[web] port JS code to Rust
This commit is contained in:
Emil Ernerfeldt
242
docs/index.html
242
docs/index.html
@@ -30,6 +30,9 @@
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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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@@ -52,79 +55,45 @@
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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) {
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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 = {
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egui: get_egui_input(canvas),
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web: {
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location: window.location.toString(),
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location_hash: window.location.hash.toString(), // i.e. #fragment
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},
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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_egui_cursor(output.cursor_icon);
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// console.log(`Translated ${output.cursor_icon} to ${document.body.style.cursor}`);
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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_egui_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_horizontal") { return "ew-resize"; }
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else if (cursor == "resize_ne_sw") { return "nesw-resize"; }
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else if (cursor == "resize_nw_se") { return "nwse-resize"; }
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else if (cursor == "resize_vertical") { return "ns-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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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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var g_mouse_pos = null;
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var g_mouse_down = false;
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var g_is_touch = false; // we don't know yet
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var g_scroll_delta_x = 0;
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var g_scroll_delta_y = 0;
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var g_events = [];
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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 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_egui_input() {
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let state = egui_state();
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function get_egui_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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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: g_events,
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events: state.events,
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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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g_events = [];
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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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@@ -147,9 +116,12 @@
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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);
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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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@@ -161,89 +133,32 @@
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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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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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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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g_events.push({ "key": { "key": key, 'pressed': true } });
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egui_state().events.push({ "key": { "key": key, 'pressed': true } });
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} else {
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g_events.push({ "text": event.key });
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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", function (event) {
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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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@@ -254,7 +169,7 @@
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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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g_events.push({ "key": { "key": key, 'pressed': false } });
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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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@@ -267,8 +182,77 @@
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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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paint_and_schedule();
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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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@@ -294,8 +278,6 @@
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return null;
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}
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</script>
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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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</body>
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</html>
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