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Small refactor to JavaScript handlers.

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Crated helper class in native/utils.js.
Simplify code in OS/DisplayServer.
This commit is contained in:
Fabio Alessandrelli 2020-08-06 15:43:01 +02:00
parent 7d045b8543
commit 48aa0b5b03
2 changed files with 51 additions and 19 deletions
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29
platform/javascript/display_server_javascript.cpp
View File

@ -918,27 +918,25 @@ DisplayServerJavaScript::DisplayServerJavaScript(const String &p_rendering_drive
/* clang-format off */
EM_ASM_ARGS({
Module.listeners = {};
// Bind native event listeners.
// Module.listeners, and Module.drop_handler are defined in native/utils.js
const canvas = Module['canvas'];
const send_window_event = cwrap('send_window_event', null, ['number']);
const notifications = arguments;
(['mouseover', 'mouseleave', 'focus', 'blur']).forEach(function(event, index) {
Module.listeners[event] = send_window_event.bind(null, notifications[index]);
canvas.addEventListener(event, Module.listeners[event]);
Module.listeners.add(canvas, event, send_window_event.bind(null, notifications[index]), true);
});
// Clipboard
const update_clipboard = cwrap('update_clipboard', null, ['string']);
Module.listeners['paste'] = function(evt) {
Module.listeners.add(window, 'paste', function(evt) {
update_clipboard(evt.clipboardData.getData('text'));
};
window.addEventListener('paste', Module.listeners['paste'], false);
Module.listeners['dragover'] = function(ev) {
}, false);
// Drag an drop
Module.listeners.add(canvas, 'dragover', function(ev) {
// Prevent default behavior (which would try to open the file(s))
ev.preventDefault();
};
Module.listeners['drop'] = Module.drop_handler; // Defined in native/utils.js
canvas.addEventListener('dragover', Module.listeners['dragover'], false);
canvas.addEventListener('drop', Module.listeners['drop'], false);
}, false);
Module.listeners.add(canvas, 'drop', Module.drop_handler, false);
},
WINDOW_EVENT_MOUSE_ENTER,
WINDOW_EVENT_MOUSE_EXIT,
@ -952,14 +950,7 @@ DisplayServerJavaScript::DisplayServerJavaScript(const String &p_rendering_drive
DisplayServerJavaScript::~DisplayServerJavaScript() {
EM_ASM({
Object.entries(Module.listeners).forEach(function(kv) {
if (kv[0] == 'paste') {
window.removeEventListener(kv[0], kv[1], true);
} else {
Module['canvas'].removeEventListener(kv[0], kv[1]);
}
});
Module.listeners = {};
Module.listeners.clear();
});
//emscripten_webgl_commit_frame();
//emscripten_webgl_destroy_context(webgl_ctx);

41
platform/javascript/native/utils.js
View File

@ -202,3 +202,44 @@ Module.drop_handler = (function() {
});
}
})();
function EventHandlers() {
function Handler(target, event, method, capture) {
this.target = target;
this.event = event;
this.method = method;
this.capture = capture;
}
var listeners = [];
function has(target, event, method, capture) {
return listeners.findIndex(function(e) {
return e.target === target && e.event === event && e.method === method && e.capture == capture;
}) !== -1;
}
this.add = function(target, event, method, capture) {
if (has(target, event, method, capture)) {
return;
}
listeners.push(new Handler(target, event, method, capture));
target.addEventListener(event, method, capture);
};
this.remove = function(target, event, method, capture) {
if (!has(target, event, method, capture)) {
return;
}
target.removeEventListener(event, method, capture);
};
this.clear = function() {
listeners.forEach(function(h) {
h.target.removeEventListener(h.event, h.method, h.capture);
});
listeners.length = 0;
};
}
Module.listeners = new EventHandlers();