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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
/** 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"
);