mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
704 lines
23 KiB
JavaScript
704 lines
23 KiB
JavaScript
/* vim: se cin sw=2 ts=2 et filetype=javascript :
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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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/*
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* This module implements the front end behavior for AeroPeek. Starting in
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* Windows Vista, the taskbar began showing live thumbnail previews of windows
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* when the user hovered over the window icon in the taskbar. Starting with
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* Windows 7, the taskbar allows an application to expose its tabbed interface
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* in the taskbar by showing thumbnail previews rather than the default window
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* preview. Additionally, when a user hovers over a thumbnail (tab or window),
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* they are shown a live preview of the window (or tab + its containing window).
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*
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* In Windows 7, a title, icon, close button and optional toolbar are shown for
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* each preview. This feature does not make use of the toolbar. For window
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* previews, the title is the window title and the icon the window icon. For
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* tab previews, the title is the page title and the page's favicon. In both
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* cases, the close button "does the right thing."
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*
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* The primary objects behind this feature are nsITaskbarTabPreview and
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* nsITaskbarPreviewController. Each preview has a controller. The controller
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* responds to the user's interactions on the taskbar and provides the required
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* data to the preview for determining the size of the tab and thumbnail. The
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* PreviewController class implements this interface. The preview will request
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* the controller to provide a thumbnail or preview when the user interacts with
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* the taskbar. To reduce the overhead of drawing the tab area, the controller
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* implementation caches the tab's contents in a <canvas> element. If no
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* previews or thumbnails have been requested for some time, the controller will
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* discard its cached tab contents.
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*
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* Screen real estate is limited so when there are too many thumbnails to fit
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* on the screen, the taskbar stops displaying thumbnails and instead displays
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* just the title, icon and close button in a similar fashion to previous
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* versions of the taskbar. If there are still too many previews to fit on the
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* screen, the taskbar resorts to a scroll up and scroll down button pair to let
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* the user scroll through the list of tabs. Since this is undoubtedly
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* inconvenient for users with many tabs, the AeroPeek objects turns off all of
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* the tab previews. This tells the taskbar to revert to one preview per window.
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* If the number of tabs falls below this magic threshold, the preview-per-tab
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* behavior returns. There is no reliable way to determine when the scroll
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* buttons appear on the taskbar, so a magic pref-controlled number determines
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* when this threshold has been crossed.
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*/
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this.EXPORTED_SYMBOLS = ["AeroPeek"];
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const Cc = Components.classes;
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const Ci = Components.interfaces;
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const Cu = Components.utils;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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Cu.import("resource://gre/modules/NetUtil.jsm");
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Cu.import("resource://gre/modules/PrivateBrowsingUtils.jsm");
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// Pref to enable/disable preview-per-tab
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const TOGGLE_PREF_NAME = "browser.taskbar.previews.enable";
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// Pref to determine the magic auto-disable threshold
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const DISABLE_THRESHOLD_PREF_NAME = "browser.taskbar.previews.max";
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// Pref to control the time in seconds that tab contents live in the cache
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const CACHE_EXPIRATION_TIME_PREF_NAME = "browser.taskbar.previews.cachetime";
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const WINTASKBAR_CONTRACTID = "@mozilla.org/windows-taskbar;1";
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////////////////////////////////////////////////////////////////////////////////
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//// Various utility properties
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XPCOMUtils.defineLazyServiceGetter(this, "ioSvc",
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"@mozilla.org/network/io-service;1",
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"nsIIOService");
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XPCOMUtils.defineLazyServiceGetter(this, "imgTools",
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"@mozilla.org/image/tools;1",
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"imgITools");
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XPCOMUtils.defineLazyServiceGetter(this, "faviconSvc",
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"@mozilla.org/browser/favicon-service;1",
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"nsIFaviconService");
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// nsIURI -> imgIContainer
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function _imageFromURI(uri, privateMode, callback) {
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let channel = ioSvc.newChannelFromURI(uri);
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try {
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channel.QueryInterface(Ci.nsIPrivateBrowsingChannel);
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channel.setPrivate(privateMode);
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} catch (e) {
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// Ignore channels which do not support nsIPrivateBrowsingChannel
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}
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NetUtil.asyncFetch(channel, function(inputStream, resultCode) {
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if (!Components.isSuccessCode(resultCode))
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return;
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try {
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let out_img = { value: null };
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imgTools.decodeImageData(inputStream, channel.contentType, out_img);
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callback(out_img.value);
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} catch (e) {
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// We failed, so use the default favicon (only if this wasn't the default
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// favicon).
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let defaultURI = faviconSvc.defaultFavicon;
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if (!defaultURI.equals(uri))
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_imageFromURI(defaultURI, callback);
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}
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});
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}
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// string? -> imgIContainer
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function getFaviconAsImage(iconurl, privateMode, callback) {
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if (iconurl)
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_imageFromURI(NetUtil.newURI(iconurl), privateMode, callback);
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else
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_imageFromURI(faviconSvc.defaultFavicon, privateMode, callback);
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}
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// Snaps the given rectangle to be pixel-aligned at the given scale
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function snapRectAtScale(r, scale) {
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let x = Math.floor(r.x * scale);
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let y = Math.floor(r.y * scale);
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let width = Math.ceil((r.x + r.width) * scale) - x;
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let height = Math.ceil((r.y + r.height) * scale) - y;
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r.x = x / scale;
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r.y = y / scale;
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r.width = width / scale;
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r.height = height / scale;
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}
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////////////////////////////////////////////////////////////////////////////////
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//// PreviewController
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/*
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* This class manages the behavior of the preview.
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*
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* To give greater performance when drawing, the dirty areas of the content
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* window are tracked and drawn on demand into a canvas of the same size.
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* This provides a great increase in responsiveness when drawing a preview
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* for unchanged (or even only slightly changed) tabs.
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*
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* @param win
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* The TabWindow (see below) that owns the preview that this controls
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* @param tab
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* The <tab> that this preview is associated with
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*/
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function PreviewController(win, tab) {
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this.win = win;
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this.tab = tab;
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this.linkedBrowser = tab.linkedBrowser;
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this.linkedBrowser.addEventListener("MozAfterPaint", this, false);
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this.tab.addEventListener("TabAttrModified", this, false);
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// Cannot perform the lookup during construction. See TabWindow.newTab
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XPCOMUtils.defineLazyGetter(this, "preview", function () this.win.previewFromTab(this.tab));
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XPCOMUtils.defineLazyGetter(this, "canvasPreview", function () {
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let canvas = this.win.win.document.createElementNS("http://www.w3.org/1999/xhtml", "canvas");
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canvas.mozOpaque = true;
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return canvas;
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});
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XPCOMUtils.defineLazyGetter(this, "dirtyRegion",
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function () {
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let dirtyRegion = Cc["@mozilla.org/gfx/region;1"]
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.createInstance(Ci.nsIScriptableRegion);
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dirtyRegion.init();
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return dirtyRegion;
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});
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XPCOMUtils.defineLazyGetter(this, "winutils",
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function () {
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let win = tab.linkedBrowser.contentWindow;
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return win.QueryInterface(Ci.nsIInterfaceRequestor)
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.getInterface(Ci.nsIDOMWindowUtils);
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});
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}
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PreviewController.prototype = {
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QueryInterface: XPCOMUtils.generateQI([Ci.nsITaskbarPreviewController,
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Ci.nsIDOMEventListener]),
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destroy: function () {
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this.tab.removeEventListener("TabAttrModified", this, false);
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this.linkedBrowser.removeEventListener("MozAfterPaint", this, false);
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// Break cycles, otherwise we end up leaking the window with everything
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// attached to it.
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delete this.win;
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delete this.preview;
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delete this.dirtyRegion;
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},
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get wrappedJSObject() {
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return this;
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},
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get dirtyRects() {
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let rectstream = this.dirtyRegion.getRects();
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if (!rectstream)
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return [];
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let rects = [];
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for (let i = 0; i < rectstream.length; i+= 4) {
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let r = {x: rectstream[i],
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y: rectstream[i+1],
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width: rectstream[i+2],
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height: rectstream[i+3]};
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rects.push(r);
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}
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return rects;
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},
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// Resizes the canvasPreview to 0x0, essentially freeing its memory.
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// updateCanvasPreview() will detect the size mismatch as a resize event
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// the next time it is called.
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resetCanvasPreview: function () {
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this.canvasPreview.width = 0;
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this.canvasPreview.height = 0;
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},
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get zoom() {
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// We use this property instead of the fullZoom property because this
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// accurately reflects the actual zoom factor used when drawing.
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return this.winutils.screenPixelsPerCSSPixel;
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},
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// Updates the controller's canvas with the parts of the <browser> that need
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// to be redrawn.
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updateCanvasPreview: function () {
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let win = this.linkedBrowser.contentWindow;
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let bx = this.linkedBrowser.boxObject;
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// Check for resize
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if (bx.width != this.canvasPreview.width ||
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bx.height != this.canvasPreview.height) {
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// Invalidate the entire area and repaint
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this.onTabPaint({left:0, top:0, right:win.innerWidth, bottom:win.innerHeight});
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this.canvasPreview.width = bx.width;
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this.canvasPreview.height = bx.height;
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}
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// Draw dirty regions
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let ctx = this.canvasPreview.getContext("2d");
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let scale = this.zoom;
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let flags = this.canvasPreviewFlags;
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// The dirty region may include parts that are offscreen so we clip to the
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// canvas area.
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this.dirtyRegion.intersectRect(0, 0, win.innerWidth, win.innerHeight);
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this.dirtyRects.forEach(function (r) {
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// We need to snap the rectangle to be pixel aligned in the destination
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// coordinate space. Otherwise natively themed widgets might not draw.
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snapRectAtScale(r, scale);
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let x = r.x;
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let y = r.y;
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let width = r.width;
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let height = r.height;
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ctx.save();
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ctx.scale(scale, scale);
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ctx.translate(x, y);
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ctx.drawWindow(win, x, y, width, height, "white", flags);
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ctx.restore();
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});
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this.dirtyRegion.setToRect(0,0,0,0);
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// If we're updating the canvas, then we're in the middle of a peek so
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// don't discard the cache of previews.
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AeroPeek.resetCacheTimer();
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},
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onTabPaint: function (rect) {
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let x = Math.floor(rect.left),
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y = Math.floor(rect.top),
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width = Math.ceil(rect.right) - x,
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height = Math.ceil(rect.bottom) - y;
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this.dirtyRegion.unionRect(x, y, width, height);
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},
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updateTitleAndTooltip: function () {
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let title = this.win.tabbrowser.getWindowTitleForBrowser(this.linkedBrowser);
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this.preview.title = title;
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this.preview.tooltip = title;
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},
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//////////////////////////////////////////////////////////////////////////////
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//// nsITaskbarPreviewController
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get width() {
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return this.win.width;
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},
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get height() {
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return this.win.height;
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},
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get thumbnailAspectRatio() {
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let boxObject = this.tab.linkedBrowser.boxObject;
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// Avoid returning 0
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let tabWidth = boxObject.width || 1;
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// Avoid divide by 0
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let tabHeight = boxObject.height || 1;
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return tabWidth / tabHeight;
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},
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drawPreview: function (ctx) {
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let self = this;
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this.win.tabbrowser.previewTab(this.tab, function () self.previewTabCallback(ctx));
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// We must avoid having the frame drawn around the window. See bug 520807
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return false;
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},
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previewTabCallback: function (ctx) {
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let width = this.win.width;
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let height = this.win.height;
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// Draw our toplevel window
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ctx.drawWindow(this.win.win, 0, 0, width, height, "transparent");
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// Compositor, where art thou?
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// Draw the tab content on top of the toplevel window
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this.updateCanvasPreview();
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let boxObject = this.linkedBrowser.boxObject;
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ctx.translate(boxObject.x, boxObject.y);
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ctx.drawImage(this.canvasPreview, 0, 0);
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},
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drawThumbnail: function (ctx, width, height) {
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this.updateCanvasPreview();
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let scale = width/this.linkedBrowser.boxObject.width;
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ctx.scale(scale, scale);
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ctx.drawImage(this.canvasPreview, 0, 0);
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// Don't draw a frame around the thumbnail
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return false;
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},
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onClose: function () {
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this.win.tabbrowser.removeTab(this.tab);
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},
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onActivate: function () {
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this.win.tabbrowser.selectedTab = this.tab;
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// Accept activation - this will restore the browser window
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// if it's minimized
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return true;
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},
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//// nsIDOMEventListener
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handleEvent: function (evt) {
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switch (evt.type) {
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case "MozAfterPaint":
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if (evt.originalTarget === this.linkedBrowser.contentWindow) {
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let clientRects = evt.clientRects;
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let length = clientRects.length;
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for (let i = 0; i < length; i++) {
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let r = clientRects.item(i);
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this.onTabPaint(r);
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}
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}
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let preview = this.preview;
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if (preview.visible)
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preview.invalidate();
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break;
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case "TabAttrModified":
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this.updateTitleAndTooltip();
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break;
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}
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}
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};
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XPCOMUtils.defineLazyGetter(PreviewController.prototype, "canvasPreviewFlags",
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function () { let canvasInterface = Ci.nsIDOMCanvasRenderingContext2D;
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return canvasInterface.DRAWWINDOW_DRAW_VIEW
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| canvasInterface.DRAWWINDOW_DRAW_CARET
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| canvasInterface.DRAWWINDOW_ASYNC_DECODE_IMAGES
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| canvasInterface.DRAWWINDOW_DO_NOT_FLUSH;
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});
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////////////////////////////////////////////////////////////////////////////////
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//// TabWindow
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/*
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* This class monitors a browser window for changes to its tabs
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*
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* @param win
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* The nsIDOMWindow browser window
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*/
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function TabWindow(win) {
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this.win = win;
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this.tabbrowser = win.gBrowser;
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this.previews = [];
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for (let i = 0; i < this.tabEvents.length; i++)
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this.tabbrowser.tabContainer.addEventListener(this.tabEvents[i], this, false);
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this.tabbrowser.addTabsProgressListener(this);
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for (let i = 0; i < this.winEvents.length; i++)
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this.win.addEventListener(this.winEvents[i], this, false);
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AeroPeek.windows.push(this);
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let tabs = this.tabbrowser.tabs;
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for (let i = 0; i < tabs.length; i++)
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this.newTab(tabs[i]);
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this.updateTabOrdering();
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AeroPeek.checkPreviewCount();
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}
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TabWindow.prototype = {
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_enabled: false,
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tabEvents: ["TabOpen", "TabClose", "TabSelect", "TabMove"],
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winEvents: ["tabviewshown", "tabviewhidden"],
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destroy: function () {
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this._destroying = true;
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let tabs = this.tabbrowser.tabs;
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this.tabbrowser.removeTabsProgressListener(this);
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for (let i = 0; i < this.tabEvents.length; i++)
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this.tabbrowser.tabContainer.removeEventListener(this.tabEvents[i], this, false);
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for (let i = 0; i < this.winEvents.length; i++)
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this.win.removeEventListener(this.winEvents[i], this, false);
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for (let i = 0; i < tabs.length; i++)
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this.removeTab(tabs[i]);
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let idx = AeroPeek.windows.indexOf(this.win.gTaskbarTabGroup);
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AeroPeek.windows.splice(idx, 1);
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AeroPeek.checkPreviewCount();
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},
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get width () {
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return this.win.innerWidth;
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},
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get height () {
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return this.win.innerHeight;
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},
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// Invoked when the given tab is added to this window
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newTab: function (tab) {
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let controller = new PreviewController(this, tab);
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let docShell = this.win
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.QueryInterface(Ci.nsIInterfaceRequestor)
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.getInterface(Ci.nsIWebNavigation)
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.QueryInterface(Ci.nsIDocShell);
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let preview = AeroPeek.taskbar.createTaskbarTabPreview(docShell, controller);
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preview.visible = AeroPeek.enabled;
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preview.active = this.tabbrowser.selectedTab == tab;
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// Grab the default favicon
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getFaviconAsImage(null, PrivateBrowsingUtils.isWindowPrivate(this.win), function (img) {
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// It is possible that we've already gotten the real favicon, so make sure
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// we have not set one before setting this default one.
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if (!preview.icon)
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preview.icon = img;
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});
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// It's OK to add the preview now while the favicon still loads.
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this.previews.splice(tab._tPos, 0, preview);
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AeroPeek.addPreview(preview);
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// updateTitleAndTooltip relies on having controller.preview which is lazily resolved.
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// Now that we've updated this.previews, it will resolve successfully.
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controller.updateTitleAndTooltip();
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},
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// Invoked when the given tab is closed
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removeTab: function (tab) {
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let preview = this.previewFromTab(tab);
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preview.active = false;
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preview.visible = false;
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preview.move(null);
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preview.controller.wrappedJSObject.destroy();
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// We don't want to splice from the array if the tabs aren't being removed
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// from the tab bar as well (as is the case when the window closes).
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if (!this._destroying)
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this.previews.splice(tab._tPos, 1);
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AeroPeek.removePreview(preview);
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},
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get enabled () {
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return this._enabled;
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},
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set enabled (enable) {
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this._enabled = enable;
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// Because making a tab visible requires that the tab it is next to be
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// visible, it is far simpler to unset the 'next' tab and recreate them all
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// at once.
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this.previews.forEach(function (preview) {
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preview.move(null);
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preview.visible = enable;
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});
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this.updateTabOrdering();
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},
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previewFromTab: function (tab) {
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return this.previews[tab._tPos];
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},
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updateTabOrdering: function () {
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// Since the internal taskbar array has not yet been updated we must force
|
|
// on it the sorting order of our local array. To do so we must walk
|
|
// the local array backwards, otherwise we would send move requests in the
|
|
// wrong order. See bug 522610 for details.
|
|
for (let i = this.previews.length - 1; i >= 0; i--) {
|
|
let p = this.previews[i];
|
|
let next = i == this.previews.length - 1 ? null : this.previews[i+1];
|
|
p.move(next);
|
|
}
|
|
},
|
|
|
|
//// nsIDOMEventListener
|
|
handleEvent: function (evt) {
|
|
let tab = evt.originalTarget;
|
|
switch (evt.type) {
|
|
case "TabOpen":
|
|
this.newTab(tab);
|
|
this.updateTabOrdering();
|
|
break;
|
|
case "TabClose":
|
|
this.removeTab(tab);
|
|
this.updateTabOrdering();
|
|
break;
|
|
case "TabSelect":
|
|
this.previewFromTab(tab).active = true;
|
|
break;
|
|
case "TabMove":
|
|
let oldPos = evt.detail;
|
|
let newPos = tab._tPos;
|
|
let preview = this.previews[oldPos];
|
|
this.previews.splice(oldPos, 1);
|
|
this.previews.splice(newPos, 0, preview);
|
|
this.updateTabOrdering();
|
|
break;
|
|
case "tabviewshown":
|
|
this.enabled = false;
|
|
break;
|
|
case "tabviewhidden":
|
|
if (!AeroPeek._prefenabled)
|
|
return;
|
|
this.enabled = true;
|
|
break;
|
|
}
|
|
},
|
|
|
|
//// Browser progress listener
|
|
onLinkIconAvailable: function (aBrowser, aIconURL) {
|
|
let self = this;
|
|
getFaviconAsImage(aIconURL, PrivateBrowsingUtils.isWindowPrivate(this.win), function (img) {
|
|
let index = self.tabbrowser.browsers.indexOf(aBrowser);
|
|
// Only add it if we've found the index. The tab could have closed!
|
|
if (index != -1)
|
|
self.previews[index].icon = img;
|
|
});
|
|
}
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
//// AeroPeek
|
|
|
|
/*
|
|
* This object acts as global storage and external interface for this feature.
|
|
* It maintains the values of the prefs.
|
|
*/
|
|
this.AeroPeek = {
|
|
available: false,
|
|
// Does the pref say we're enabled?
|
|
_prefenabled: true,
|
|
|
|
_enabled: true,
|
|
|
|
// nsITaskbarTabPreview array
|
|
previews: [],
|
|
|
|
// TabWindow array
|
|
windows: [],
|
|
|
|
// nsIWinTaskbar service
|
|
taskbar: null,
|
|
|
|
// Maximum number of previews
|
|
maxpreviews: 20,
|
|
|
|
// Length of time in seconds that previews are cached
|
|
cacheLifespan: 20,
|
|
|
|
initialize: function () {
|
|
if (!(WINTASKBAR_CONTRACTID in Cc))
|
|
return;
|
|
this.taskbar = Cc[WINTASKBAR_CONTRACTID].getService(Ci.nsIWinTaskbar);
|
|
this.available = this.taskbar.available;
|
|
if (!this.available)
|
|
return;
|
|
|
|
this.prefs.addObserver(TOGGLE_PREF_NAME, this, false);
|
|
this.prefs.addObserver(DISABLE_THRESHOLD_PREF_NAME, this, false);
|
|
this.prefs.addObserver(CACHE_EXPIRATION_TIME_PREF_NAME, this, false);
|
|
|
|
this.cacheLifespan = this.prefs.getIntPref(CACHE_EXPIRATION_TIME_PREF_NAME);
|
|
|
|
this.maxpreviews = this.prefs.getIntPref(DISABLE_THRESHOLD_PREF_NAME);
|
|
|
|
this.enabled = this._prefenabled = this.prefs.getBoolPref(TOGGLE_PREF_NAME);
|
|
},
|
|
|
|
destroy: function destroy() {
|
|
this._enabled = false;
|
|
|
|
this.prefs.removeObserver(TOGGLE_PREF_NAME, this);
|
|
this.prefs.removeObserver(DISABLE_THRESHOLD_PREF_NAME, this);
|
|
this.prefs.removeObserver(CACHE_EXPIRATION_TIME_PREF_NAME, this);
|
|
|
|
if (this.cacheTimer)
|
|
this.cacheTimer.cancel();
|
|
},
|
|
|
|
get enabled() {
|
|
return this._enabled;
|
|
},
|
|
|
|
set enabled(enable) {
|
|
if (this._enabled == enable)
|
|
return;
|
|
|
|
this._enabled = enable;
|
|
|
|
this.windows.forEach(function (win) {
|
|
win.enabled = enable;
|
|
});
|
|
},
|
|
|
|
addPreview: function (preview) {
|
|
this.previews.push(preview);
|
|
this.checkPreviewCount();
|
|
},
|
|
|
|
removePreview: function (preview) {
|
|
let idx = this.previews.indexOf(preview);
|
|
this.previews.splice(idx, 1);
|
|
this.checkPreviewCount();
|
|
},
|
|
|
|
checkPreviewCount: function () {
|
|
if (this.previews.length > this.maxpreviews)
|
|
this.enabled = false;
|
|
else
|
|
this.enabled = this._prefenabled;
|
|
},
|
|
|
|
onOpenWindow: function (win) {
|
|
// This occurs when the taskbar service is not available (xp, vista)
|
|
if (!this.available)
|
|
return;
|
|
|
|
win.gTaskbarTabGroup = new TabWindow(win);
|
|
},
|
|
|
|
onCloseWindow: function (win) {
|
|
// This occurs when the taskbar service is not available (xp, vista)
|
|
if (!this.available)
|
|
return;
|
|
|
|
win.gTaskbarTabGroup.destroy();
|
|
delete win.gTaskbarTabGroup;
|
|
|
|
if (this.windows.length == 0)
|
|
this.destroy();
|
|
},
|
|
|
|
resetCacheTimer: function () {
|
|
this.cacheTimer.cancel();
|
|
this.cacheTimer.init(this, 1000*this.cacheLifespan, Ci.nsITimer.TYPE_ONE_SHOT);
|
|
},
|
|
|
|
//// nsIObserver
|
|
observe: function (aSubject, aTopic, aData) {
|
|
switch (aTopic) {
|
|
case "nsPref:changed":
|
|
if (aData == CACHE_EXPIRATION_TIME_PREF_NAME)
|
|
break;
|
|
|
|
if (aData == TOGGLE_PREF_NAME)
|
|
this._prefenabled = this.prefs.getBoolPref(TOGGLE_PREF_NAME);
|
|
else if (aData == DISABLE_THRESHOLD_PREF_NAME)
|
|
this.maxpreviews = this.prefs.getIntPref(DISABLE_THRESHOLD_PREF_NAME);
|
|
// Might need to enable/disable ourselves
|
|
this.checkPreviewCount();
|
|
break;
|
|
case "timer-callback":
|
|
this.previews.forEach(function (preview) {
|
|
let controller = preview.controller.wrappedJSObject;
|
|
controller.resetCanvasPreview();
|
|
});
|
|
break;
|
|
}
|
|
}
|
|
};
|
|
|
|
XPCOMUtils.defineLazyGetter(AeroPeek, "cacheTimer", function ()
|
|
Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer)
|
|
);
|
|
|
|
XPCOMUtils.defineLazyServiceGetter(AeroPeek, "prefs",
|
|
"@mozilla.org/preferences-service;1",
|
|
"nsIPrefBranch");
|
|
|
|
AeroPeek.initialize();
|