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-rw-r--r--toolkit/content/viewZoomOverlay.js141
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diff --git a/toolkit/content/viewZoomOverlay.js b/toolkit/content/viewZoomOverlay.js
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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 global gBrowser variable
+ * or use the methods that accept a browser to be modified.
+ **/
+
+var ZoomManager = {
+ set useFullZoom(aVal) {
+ Services.prefs.setBoolPref("browser.zoom.full", aVal);
+ },
+
+ get zoom() {
+ return this.getZoomForBrowser(gBrowser);
+ },
+
+ useFullZoomForBrowser: function ZoomManager_useFullZoomForBrowser(aBrowser) {
+ return this.useFullZoom || aBrowser.isSyntheticDocument;
+ },
+
+ getFullZoomForBrowser: function ZoomManager_getFullZoomForBrowser(aBrowser) {
+ if (!this.useFullZoomForBrowser(aBrowser)) {
+ return 1.0;
+ }
+ return this.getZoomForBrowser(aBrowser);
+ },
+
+ getZoomForBrowser: function ZoomManager_getZoomForBrowser(aBrowser) {
+ let zoom = this.useFullZoomForBrowser(aBrowser)
+ ? aBrowser.fullZoom
+ : aBrowser.textZoom;
+ // Round to remove any floating-point error.
+ return Number(zoom ? zoom.toFixed(2) : 1);
+ },
+
+ set zoom(aVal) {
+ this.setZoomForBrowser(gBrowser, aVal);
+ },
+
+ setZoomForBrowser: function ZoomManager_setZoomForBrowser(aBrowser, aVal) {
+ if (aVal < this.MIN || aVal > this.MAX) {
+ throw Components.Exception("", Cr.NS_ERROR_INVALID_ARG);
+ }
+
+ if (this.useFullZoomForBrowser(aBrowser)) {
+ aBrowser.textZoom = 1;
+ aBrowser.fullZoom = aVal;
+ } else {
+ aBrowser.textZoom = aVal;
+ aBrowser.fullZoom = 1;
+ }
+ },
+
+ 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];
+ },
+};
+
+XPCOMUtils.defineLazyPreferenceGetter(
+ ZoomManager,
+ "MIN",
+ "zoom.minPercent",
+ 30,
+ null,
+ v => v / 100
+);
+XPCOMUtils.defineLazyPreferenceGetter(
+ ZoomManager,
+ "MAX",
+ "zoom.maxPercent",
+ 500,
+ null,
+ v => v / 100
+);
+
+XPCOMUtils.defineLazyPreferenceGetter(
+ ZoomManager,
+ "zoomValues",
+ "toolkit.zoomManager.zoomValues",
+ ".3,.5,.67,.8,.9,1,1.1,1.2,1.33,1.5,1.7,2,2.4,3,4,5",
+ null,
+ zoomValues => {
+ zoomValues = 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();
+ }
+
+ return zoomValues;
+ }
+);
+
+XPCOMUtils.defineLazyPreferenceGetter(
+ ZoomManager,
+ "useFullZoom",
+ "browser.zoom.full"
+);