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