gecko/mobile/chrome/content/AnimatedZoom.js

129 lines
4.7 KiB
JavaScript

// -*- Mode: js2; tab-width: 2; indent-tabs-mode: nil; js2-basic-offset: 2; js2-skip-preprocessor-directives: t; -*-
/*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Mobile Browser.
*
* The Initial Developer of the Original Code is
* Mozilla Corporation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Benjamin Stover <bstover@mozilla.com>
* Matt Brubeck <mbrubeck@mozilla.com>
* Jaakko Kiviluoto <jaakko.kiviluoto@digia.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
let Cc = Components.classes;
let Ci = Components.interfaces;
let Cu = Components.utils;
/**
* Responsible for zooming in to a given view rectangle
*/
const AnimatedZoom = {
/** Starts an animated zoom to zoomRect. */
animateTo: function(aZoomRect) {
if (!aZoomRect)
return;
this.zoomTo = aZoomRect.clone();
if (this.animationDuration === undefined)
this.animationDuration = Services.prefs.getIntPref("browser.ui.zoom.animationDuration");
Browser.hideSidebars();
Browser.hideTitlebar();
Browser.forceChromeReflow();
this.beginTime = mozAnimationStartTime;
// Check if zooming animations were occuring before.
if (this.zoomRect) {
this.zoomFrom = this.zoomRect;
} else {
this.zoomFrom = this.getStartRect();
this.updateTo(this.zoomFrom);
window.addEventListener("MozBeforePaint", this, false);
mozRequestAnimationFrame();
}
},
/** Get the visible rect, in device pixels relative to the content origin. */
getStartRect: function getStartRect() {
let browser = getBrowser();
let bcr = browser.getBoundingClientRect();
let scroll = browser.getPosition();
return new Rect(scroll.x, scroll.y, bcr.width, bcr.height);
},
/** Update the visible rect, in device pixels relative to the content origin. */
updateTo: function(nextRect) {
let zoomRatio = window.innerWidth / nextRect.width;
let zoomLevel = getBrowser().scale * zoomRatio;
// XXX using the underlying frameLoader APIs is undesirable and is not a
// pattern to propagate. The browser binding should be taking care of this!
// There is some bug that I have not yet discovered that make browser.scrollTo
// not behave correctly and there is no intelligence in browser.scale to keep
// the actual resolution changes small.
getBrowser()._frameLoader.setViewportScale(zoomLevel, zoomLevel);
getBrowser()._frameLoader.scrollViewportTo(nextRect.left * zoomRatio, nextRect.top * zoomRatio);
this.zoomRect = nextRect;
},
/** Stop animation, zoom to point, and clean up. */
finish: function() {
window.removeEventListener("MozBeforePaint", this, false);
Browser.setVisibleRect(this.zoomTo || this.zoomRect);
this.beginTime = null;
this.zoomTo = null;
this.zoomFrom = null;
this.zoomRect = null;
},
handleEvent: function(aEvent) {
try {
let tdiff = aEvent.timeStamp - this.beginTime;
let counter = tdiff / this.animationDuration;
if (counter < 1) {
// update browser to interpolated rectangle
let rect = this.zoomFrom.blend(this.zoomTo, counter);
this.updateTo(rect);
mozRequestAnimationFrame();
} else {
// last cycle already rendered final scaled image, now clean up
this.finish();
}
} catch(e) {
this.finish();
throw e;
}
}
};