зеркало из https://github.com/mozilla/gecko-dev.git
91 строка
2.3 KiB
JavaScript
91 строка
2.3 KiB
JavaScript
/* vim: set ts=2 sw=2 sts=2 et tw=80: */
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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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"use strict";
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var EXPORTED_SYMBOLS = ["ZoomChild"];
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ChromeUtils.import("resource://gre/modules/ActorChild.jsm");
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class ZoomChild extends ActorChild {
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constructor(dispatcher) {
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super(dispatcher);
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this._cache = {
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fullZoom: NaN,
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textZoom: NaN,
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};
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}
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get fullZoom() {
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return this._cache.fullZoom;
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}
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get textZoom() {
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return this._cache.textZoom;
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}
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set fullZoom(value) {
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this._cache.fullZoom = value;
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this._markupViewer.fullZoom = value;
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}
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set textZoom(value) {
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this._cache.textZoom = value;
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this._markupViewer.textZoom = value;
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}
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refreshFullZoom() {
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return this._refreshZoomValue("fullZoom");
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}
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refreshTextZoom() {
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return this._refreshZoomValue("textZoom");
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}
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/**
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* Retrieves specified zoom property value from markupViewer and refreshes
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* cache if needed.
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* @param valueName Either 'fullZoom' or 'textZoom'.
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* @returns Returns true if cached value was actually refreshed.
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* @private
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*/
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_refreshZoomValue(valueName) {
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let actualZoomValue = this._markupViewer[valueName];
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// Round to remove any floating-point error.
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actualZoomValue = Number(actualZoomValue.toFixed(2));
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if (actualZoomValue != this._cache[valueName]) {
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this._cache[valueName] = actualZoomValue;
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return true;
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}
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return false;
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}
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get _markupViewer() {
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return this.docShell.contentViewer;
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}
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receiveMessage(message) {
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if (message.name == "FullZoom") {
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this.fullZoom = message.data.value;
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} else if (message.name == "TextZoom") {
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this.textZoom = message.data.value;
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}
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}
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handleEvent(event) {
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if (event.type == "FullZoomChange") {
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if (this.refreshFullZoom()) {
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this.mm.sendAsyncMessage("FullZoomChange", { value: this.fullZoom });
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}
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} else if (event.type == "TextZoomChange") {
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if (this.refreshTextZoom()) {
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this.mm.sendAsyncMessage("TextZoomChange", { value: this.textZoom });
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}
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} else if (event.type == "ZoomChangeUsingMouseWheel") {
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this.mm.sendAsyncMessage("ZoomChangeUsingMouseWheel", {});
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}
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}
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}
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