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// -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/** Document Zoom Management Code
*
* To use this, you'll need to have a getBrowser() function or use the methods
* that accept a browser to be modified.
**/
var ZoomManager = {
get _prefBranch() {
delete this._prefBranch;
return this._prefBranch = Components.classes["@mozilla.org/preferences-service;1"]
.getService(Components.interfaces.nsIPrefBranch);
},
get MIN() {
delete this.MIN;
return this.MIN = this._prefBranch.getIntPref("zoom.minPercent") / 100;
},
get MAX() {
delete this.MAX;
return this.MAX = this._prefBranch.getIntPref("zoom.maxPercent") / 100;
},
get useFullZoom() {
return this._prefBranch.getBoolPref("browser.zoom.full");
},
set useFullZoom(aVal) {
this._prefBranch.setBoolPref("browser.zoom.full", aVal);
return aVal;
},
get zoom() {
return this.getZoomForBrowser(getBrowser());
},
getZoomForBrowser: function ZoomManager_getZoomForBrowser(aBrowser) {
let zoom = (this.useFullZoom || aBrowser.isSyntheticDocument)
? aBrowser.fullZoom : aBrowser.textZoom;
// Round to remove any floating-point error.
return Number(zoom.toFixed(2));
},
set zoom(aVal) {
this.setZoomForBrowser(getBrowser(), aVal);
return aVal;
},
setZoomForBrowser: function ZoomManager_setZoomForBrowser(aBrowser, aVal) {
if (aVal < this.MIN || aVal > this.MAX)
throw Components.results.NS_ERROR_INVALID_ARG;
if (this.useFullZoom || aBrowser.isSyntheticDocument) {
aBrowser.textZoom = 1;
aBrowser.fullZoom = aVal;
} else {
aBrowser.textZoom = aVal;
aBrowser.fullZoom = 1;
}
},
get zoomValues() {
var zoomValues = this._prefBranch.getCharPref("toolkit.zoomManager.zoomValues")
.split(",").map(parseFloat);
zoomValues.sort((a, b) => a - b);
while (zoomValues[0] < this.MIN)
zoomValues.shift();
while (zoomValues[zoomValues.length - 1] > this.MAX)
zoomValues.pop();
delete this.zoomValues;
return this.zoomValues = zoomValues;
},
enlarge: function ZoomManager_enlarge() {
var i = this.zoomValues.indexOf(this.snap(this.zoom)) + 1;
if (i < this.zoomValues.length)
this.zoom = this.zoomValues[i];
},
reduce: function ZoomManager_reduce() {
var i = this.zoomValues.indexOf(this.snap(this.zoom)) - 1;
if (i >= 0)
this.zoom = this.zoomValues[i];
},
reset: function ZoomManager_reset() {
this.zoom = 1;
},
toggleZoom: function ZoomManager_toggleZoom() {
var zoomLevel = this.zoom;
this.useFullZoom = !this.useFullZoom;
this.zoom = zoomLevel;
},
snap: function ZoomManager_snap(aVal) {
var values = this.zoomValues;
for (var i = 0; i < values.length; i++) {
if (values[i] >= aVal) {
if (i > 0 && aVal - values[i - 1] < values[i] - aVal)
i--;
return values[i];
}
}
return values[i - 1];
}
};
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