112 lines
2.7 KiB
JavaScript
112 lines
2.7 KiB
JavaScript
/**
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* @private
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* Handle batch read / write of DOMs, currently used in SizeMonitor + PaintMonitor
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*/
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Ext.define('Ext.TaskQueue', {
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requires: 'Ext.AnimationQueue',
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singleton: true,
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pending: false,
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mode: true,
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constructor: function() {
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this.readQueue = [];
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this.writeQueue = [];
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this.run = Ext.Function.bind(this.run, this);
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this.watch = Ext.Function.bind(this.watch, this);
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// iOS has a nasty bug which causes pending requestAnimationFrame to not release
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// the callback when the WebView is switched back and forth from / to being background process
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// We use a watchdog timer to workaround this, and restore the pending state correctly if this happens
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// This timer has to be set as an interval from the very beginning and we have to keep it running for
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// as long as the app lives, setting it later doesn't seem to work
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if (Ext.os.is.iOS) {
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setInterval(this.watch, 500);
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}
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},
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requestRead: function(fn, scope, args) {
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this.request(true);
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this.readQueue.push(arguments);
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},
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requestWrite: function(fn, scope, args) {
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this.request(false);
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this.writeQueue.push(arguments);
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},
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request: function(mode) {
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if (!this.pending) {
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this.pendingTime = Date.now();
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this.pending = true;
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this.mode = mode;
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if (mode) {
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setTimeout(this.run, 1);
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} else {
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requestAnimationFrame(this.run);
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}
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}
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},
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watch: function() {
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if (this.pending && Date.now() - this.pendingTime >= 500) {
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this.run();
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}
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},
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run: function() {
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this.pending = false;
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var readQueue = this.readQueue,
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writeQueue = this.writeQueue,
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request = null,
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queue;
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if (this.mode) {
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queue = readQueue;
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if (writeQueue.length > 0) {
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request = false;
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}
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}
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else {
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queue = writeQueue;
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if (readQueue.length > 0) {
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request = true;
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}
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}
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var tasks = queue.slice(),
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i, ln, task, fn, scope;
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queue.length = 0;
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for (i = 0, ln = tasks.length; i < ln; i++) {
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task = tasks[i];
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fn = task[0];
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scope = task[1];
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if (typeof fn == 'string') {
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fn = scope[fn];
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}
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if (task.length > 2) {
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fn.apply(scope, task[2]);
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}
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else {
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fn.call(scope);
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}
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}
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tasks.length = 0;
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if (request !== null) {
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this.request(request);
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}
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}
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});
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