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Adds EventBus.

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This commit is contained in:
Yury Delendik 2016-04-25 17:57:15 -05:00
parent 55581b162e
commit 7fd3db9977
17 changed files with 510 additions and 151 deletions
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44
web/ui_utils.js
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@ -384,6 +384,49 @@ function getPDFFileNameFromURL(url) {
return suggestedFilename || 'document.pdf';
}
/**
* Simple event bus for an application. Listeners are attached using the
* `on` and `off` methods. To raise an event, the `dispatch` method shall be
* used.
*/
var EventBus = (function EventBusClosure() {
function EventBus() {
this._listeners = Object.create(null);
}
EventBus.prototype = {
on: function EventBus_on(eventName, listener) {
var eventListeners = this._listeners[eventName];
if (!eventListeners) {
eventListeners = [];
this._listeners[eventName] = eventListeners;
}
eventListeners.push(listener);
},
off: function EventBus_on(eventName, listener) {
var eventListeners = this._listeners[eventName];
var i;
if (!eventListeners || ((i = eventListeners.indexOf(listener)) < 0)) {
return;
}
eventListeners.splice(i, 1);
},
dispatch: function EventBus_dispath(eventName) {
var eventListeners = this._listeners[eventName];
if (!eventListeners || eventListeners.length === 0) {
return;
}
// Passing all arguments after the eventName to the listeners.
var args = Array.prototype.slice.call(arguments, 1);
// Making copy of the listeners array in case if it will be modified
// during dispatch.
eventListeners.slice(0).forEach(function (listener) {
listener.apply(null, args);
});
}
};
return EventBus;
})();
var ProgressBar = (function ProgressBarClosure() {
function clamp(v, min, max) {
@ -474,6 +517,7 @@ exports.MAX_AUTO_SCALE = MAX_AUTO_SCALE;
exports.SCROLLBAR_PADDING = SCROLLBAR_PADDING;
exports.VERTICAL_PADDING = VERTICAL_PADDING;
exports.mozL10n = mozL10n;
exports.EventBus = EventBus;
exports.ProgressBar = ProgressBar;
exports.getPDFFileNameFromURL = getPDFFileNameFromURL;
exports.noContextMenuHandler = noContextMenuHandler;