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-/* vim: se cin sw=2 ts=2 et filetype=javascript :
- * 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/. */
-/*
- * This module implements the front end behavior for AeroPeek. Starting in
- * Windows Vista, the taskbar began showing live thumbnail previews of windows
- * when the user hovered over the window icon in the taskbar. Starting with
- * Windows 7, the taskbar allows an application to expose its tabbed interface
- * in the taskbar by showing thumbnail previews rather than the default window
- * preview. Additionally, when a user hovers over a thumbnail (tab or window),
- * they are shown a live preview of the window (or tab + its containing window).
- *
- * In Windows 7, a title, icon, close button and optional toolbar are shown for
- * each preview. This feature does not make use of the toolbar. For window
- * previews, the title is the window title and the icon the window icon. For
- * tab previews, the title is the page title and the page's favicon. In both
- * cases, the close button "does the right thing."
- *
- * The primary objects behind this feature are nsITaskbarTabPreview and
- * nsITaskbarPreviewController. Each preview has a controller. The controller
- * responds to the user's interactions on the taskbar and provides the required
- * data to the preview for determining the size of the tab and thumbnail. The
- * PreviewController class implements this interface. The preview will request
- * the controller to provide a thumbnail or preview when the user interacts with
- * the taskbar. To reduce the overhead of drawing the tab area, the controller
- * implementation caches the tab's contents in a <canvas> element. If no
- * previews or thumbnails have been requested for some time, the controller will
- * discard its cached tab contents.
- *
- * Screen real estate is limited so when there are too many thumbnails to fit
- * on the screen, the taskbar stops displaying thumbnails and instead displays
- * just the title, icon and close button in a similar fashion to previous
- * versions of the taskbar. If there are still too many previews to fit on the
- * screen, the taskbar resorts to a scroll up and scroll down button pair to let
- * the user scroll through the list of tabs. Since this is undoubtedly
- * inconvenient for users with many tabs, the AeroPeek objects turns off all of
- * the tab previews. This tells the taskbar to revert to one preview per window.
- * If the number of tabs falls below this magic threshold, the preview-per-tab
- * behavior returns. There is no reliable way to determine when the scroll
- * buttons appear on the taskbar, so a magic pref-controlled number determines
- * when this threshold has been crossed.
- */
-this.EXPORTED_SYMBOLS = ["AeroPeek"];
-
-const Cc = Components.classes;
-const Ci = Components.interfaces;
-const Cu = Components.utils;
-
-Cu.import("resource://gre/modules/NetUtil.jsm");
-Cu.import("resource://gre/modules/PlacesUtils.jsm");
-Cu.import("resource://gre/modules/PrivateBrowsingUtils.jsm");
-Cu.import("resource://gre/modules/Services.jsm");
-Cu.import("resource://gre/modules/XPCOMUtils.jsm");
-
-// Pref to enable/disable preview-per-tab
-const TOGGLE_PREF_NAME = "browser.taskbar.previews.enable";
-// Pref to determine the magic auto-disable threshold
-const DISABLE_THRESHOLD_PREF_NAME = "browser.taskbar.previews.max";
-// Pref to control the time in seconds that tab contents live in the cache
-const CACHE_EXPIRATION_TIME_PREF_NAME = "browser.taskbar.previews.cachetime";
-
-const WINTASKBAR_CONTRACTID = "@mozilla.org/windows-taskbar;1";
-
-// Various utility properties
-XPCOMUtils.defineLazyServiceGetter(this, "imgTools",
- "@mozilla.org/image/tools;1",
- "imgITools");
-XPCOMUtils.defineLazyModuleGetter(this, "PageThumbs",
- "resource://gre/modules/PageThumbs.jsm");
-
-// nsIURI -> imgIContainer
-function _imageFromURI(uri, privateMode, callback) {
- let channel = NetUtil.newChannel({
- uri: uri,
- loadUsingSystemPrincipal: true,
- contentPolicyType: Ci.nsIContentPolicy.TYPE_INTERNAL_IMAGE
- });
-
- try {
- channel.QueryInterface(Ci.nsIPrivateBrowsingChannel);
- channel.setPrivate(privateMode);
- } catch (e) {
- // Ignore channels which do not support nsIPrivateBrowsingChannel
- }
- NetUtil.asyncFetch(channel, function(inputStream, resultCode) {
- if (!Components.isSuccessCode(resultCode))
- return;
- try {
- let out_img = { value: null };
- imgTools.decodeImageData(inputStream, channel.contentType, out_img);
- callback(out_img.value);
- } catch (e) {
- // We failed, so use the default favicon (only if this wasn't the default
- // favicon).
- let defaultURI = PlacesUtils.favicons.defaultFavicon;
- if (!defaultURI.equals(uri))
- _imageFromURI(defaultURI, privateMode, callback);
- }
- });
-}
-
-// string? -> imgIContainer
-function getFaviconAsImage(iconurl, privateMode, callback) {
- if (iconurl) {
- _imageFromURI(NetUtil.newURI(iconurl), privateMode, callback);
- } else {
- _imageFromURI(PlacesUtils.favicons.defaultFavicon, privateMode, callback);
- }
-}
-
-// Snaps the given rectangle to be pixel-aligned at the given scale
-function snapRectAtScale(r, scale) {
- let x = Math.floor(r.x * scale);
- let y = Math.floor(r.y * scale);
- let width = Math.ceil((r.x + r.width) * scale) - x;
- let height = Math.ceil((r.y + r.height) * scale) - y;
-
- r.x = x / scale;
- r.y = y / scale;
- r.width = width / scale;
- r.height = height / scale;
-}
-
-// PreviewController
-
-/*
- * This class manages the behavior of thumbnails and previews. It has the following
- * responsibilities:
- * 1) responding to requests from Windows taskbar for a thumbnail or window
- * preview.
- * 2) listens for dom events that result in a thumbnail or window preview needing
- * to be refresh, and communicates this to the taskbar.
- * 3) Handles querying and returning to the taskbar new thumbnail or window
- * preview images through PageThumbs.
- *
- * @param win
- * The TabWindow (see below) that owns the preview that this controls
- * @param tab
- * The <tab> that this preview is associated with
- */
-function PreviewController(win, tab) {
- this.win = win;
- this.tab = tab;
- this.linkedBrowser = tab.linkedBrowser;
- this.preview = this.win.createTabPreview(this);
-
- this.tab.addEventListener("TabAttrModified", this, false);
-
- XPCOMUtils.defineLazyGetter(this, "canvasPreview", function () {
- let canvas = PageThumbs.createCanvas();
- canvas.mozOpaque = true;
- return canvas;
- });
-}
-
-PreviewController.prototype = {
- QueryInterface: XPCOMUtils.generateQI([Ci.nsITaskbarPreviewController,
- Ci.nsIDOMEventListener]),
-
- destroy: function () {
- this.tab.removeEventListener("TabAttrModified", this, false);
-
- // Break cycles, otherwise we end up leaking the window with everything
- // attached to it.
- delete this.win;
- delete this.preview;
- },
-
- get wrappedJSObject() {
- return this;
- },
-
- // Resizes the canvasPreview to 0x0, essentially freeing its memory.
- resetCanvasPreview: function () {
- this.canvasPreview.width = 0;
- this.canvasPreview.height = 0;
- },
-
- /**
- * Set the canvas dimensions.
- */
- resizeCanvasPreview: function (aRequestedWidth, aRequestedHeight) {
- this.canvasPreview.width = aRequestedWidth;
- this.canvasPreview.height = aRequestedHeight;
- },
-
-
- get zoom() {
- // Note that winutils.fullZoom accounts for "quantization" of the zoom factor
- // from nsIContentViewer due to conversion through appUnits.
- // We do -not- want screenPixelsPerCSSPixel here, because that would -also-
- // incorporate any scaling that is applied due to hi-dpi resolution options.
- return this.tab.linkedBrowser.fullZoom;
- },
-
- get screenPixelsPerCSSPixel() {
- let chromeWin = this.tab.ownerGlobal;
- let windowUtils = chromeWin.getInterface(Ci.nsIDOMWindowUtils);
- return windowUtils.screenPixelsPerCSSPixel;
- },
-
- get browserDims() {
- return this.tab.linkedBrowser.getBoundingClientRect();
- },
-
- cacheBrowserDims: function () {
- let dims = this.browserDims;
- this._cachedWidth = dims.width;
- this._cachedHeight = dims.height;
- },
-
- testCacheBrowserDims: function () {
- let dims = this.browserDims;
- return this._cachedWidth == dims.width &&
- this._cachedHeight == dims.height;
- },
-
- /**
- * Capture a new thumbnail image for this preview. Called by the controller
- * in response to a request for a new thumbnail image.
- */
- updateCanvasPreview: function (aFullScale, aCallback) {
- // Update our cached browser dims so that delayed resize
- // events don't trigger another invalidation if this tab becomes active.
- this.cacheBrowserDims();
- PageThumbs.captureToCanvas(this.linkedBrowser, this.canvasPreview,
- aCallback, { fullScale: aFullScale });
- // If we're updating the canvas, then we're in the middle of a peek so
- // don't discard the cache of previews.
- AeroPeek.resetCacheTimer();
- },
-
- updateTitleAndTooltip: function () {
- let title = this.win.tabbrowser.getWindowTitleForBrowser(this.linkedBrowser);
- this.preview.title = title;
- this.preview.tooltip = title;
- },
-
- // nsITaskbarPreviewController
-
- // window width and height, not browser
- get width() {
- return this.win.width;
- },
-
- // window width and height, not browser
- get height() {
- return this.win.height;
- },
-
- get thumbnailAspectRatio() {
- let browserDims = this.browserDims;
- // Avoid returning 0
- let tabWidth = browserDims.width || 1;
- // Avoid divide by 0
- let tabHeight = browserDims.height || 1;
- return tabWidth / tabHeight;
- },
-
- /**
- * Responds to taskbar requests for window previews. Returns the results asynchronously
- * through updateCanvasPreview.
- *
- * @param aTaskbarCallback nsITaskbarPreviewCallback results callback
- */
- requestPreview: function (aTaskbarCallback) {
- // Grab a high res content preview
- this.resetCanvasPreview();
- this.updateCanvasPreview(true, (aPreviewCanvas) => {
- let winWidth = this.win.width;
- let winHeight = this.win.height;
-
- let composite = PageThumbs.createCanvas();
-
- // Use transparency, Aero glass is drawn black without it.
- composite.mozOpaque = false;
-
- let ctx = composite.getContext('2d');
- let scale = this.screenPixelsPerCSSPixel / this.zoom;
-
- composite.width = winWidth * scale;
- composite.height = winHeight * scale;
-
- ctx.save();
- ctx.scale(scale, scale);
-
- // Draw chrome. Note we currently do not get scrollbars for remote frames
- // in the image above.
- ctx.drawWindow(this.win.win, 0, 0, winWidth, winHeight, "rgba(0,0,0,0)");
-
- // Draw the content are into the composite canvas at the right location.
- ctx.drawImage(aPreviewCanvas, this.browserDims.x, this.browserDims.y,
- aPreviewCanvas.width, aPreviewCanvas.height);
- ctx.restore();
-
- // Deliver the resulting composite canvas to Windows
- this.win.tabbrowser.previewTab(this.tab, function () {
- aTaskbarCallback.done(composite, false);
- });
- });
- },
-
- /**
- * Responds to taskbar requests for tab thumbnails. Returns the results asynchronously
- * through updateCanvasPreview.
- *
- * Note Windows requests a specific width and height here, if the resulting thumbnail
- * does not match these dimensions thumbnail display will fail.
- *
- * @param aTaskbarCallback nsITaskbarPreviewCallback results callback
- * @param aRequestedWidth width of the requested thumbnail
- * @param aRequestedHeight height of the requested thumbnail
- */
- requestThumbnail: function (aTaskbarCallback, aRequestedWidth, aRequestedHeight) {
- this.resizeCanvasPreview(aRequestedWidth, aRequestedHeight);
- this.updateCanvasPreview(false, (aThumbnailCanvas) => {
- aTaskbarCallback.done(aThumbnailCanvas, false);
- });
- },
-
- // Event handling
-
- onClose: function () {
- this.win.tabbrowser.removeTab(this.tab);
- },
-
- onActivate: function () {
- this.win.tabbrowser.selectedTab = this.tab;
-
- // Accept activation - this will restore the browser window
- // if it's minimized
- return true;
- },
-
- // nsIDOMEventListener
- handleEvent: function (evt) {
- switch (evt.type) {
- case "TabAttrModified":
- this.updateTitleAndTooltip();
- break;
- }
- }
-};
-
-XPCOMUtils.defineLazyGetter(PreviewController.prototype, "canvasPreviewFlags",
- function () { let canvasInterface = Ci.nsIDOMCanvasRenderingContext2D;
- return canvasInterface.DRAWWINDOW_DRAW_VIEW
- | canvasInterface.DRAWWINDOW_DRAW_CARET
- | canvasInterface.DRAWWINDOW_ASYNC_DECODE_IMAGES
- | canvasInterface.DRAWWINDOW_DO_NOT_FLUSH;
-});
-
-// TabWindow
-
-/*
- * This class monitors a browser window for changes to its tabs
- *
- * @param win
- * The nsIDOMWindow browser window
- */
-function TabWindow(win) {
- this.win = win;
- this.tabbrowser = win.gBrowser;
-
- this.previews = new Map();
-
- for (let i = 0; i < this.tabEvents.length; i++)
- this.tabbrowser.tabContainer.addEventListener(this.tabEvents[i], this, false);
-
- for (let i = 0; i < this.winEvents.length; i++)
- this.win.addEventListener(this.winEvents[i], this, false);
-
- this.tabbrowser.addTabsProgressListener(this);
-
- AeroPeek.windows.push(this);
- let tabs = this.tabbrowser.tabs;
- for (let i = 0; i < tabs.length; i++)
- this.newTab(tabs[i]);
-
- this.updateTabOrdering();
- AeroPeek.checkPreviewCount();
-}
-
-TabWindow.prototype = {
- _enabled: false,
- _cachedWidth: 0,
- _cachedHeight: 0,
- tabEvents: ["TabOpen", "TabClose", "TabSelect", "TabMove"],
- winEvents: ["resize"],
-
- destroy: function () {
- this._destroying = true;
-
- let tabs = this.tabbrowser.tabs;
-
- this.tabbrowser.removeTabsProgressListener(this);
-
- for (let i = 0; i < this.winEvents.length; i++)
- this.win.removeEventListener(this.winEvents[i], this, false);
-
- for (let i = 0; i < this.tabEvents.length; i++)
- this.tabbrowser.tabContainer.removeEventListener(this.tabEvents[i], this, false);
-
- for (let i = 0; i < tabs.length; i++)
- this.removeTab(tabs[i]);
-
- let idx = AeroPeek.windows.indexOf(this.win.gTaskbarTabGroup);
- AeroPeek.windows.splice(idx, 1);
- AeroPeek.checkPreviewCount();
- },
-
- get width () {
- return this.win.innerWidth;
- },
- get height () {
- return this.win.innerHeight;
- },
-
- cacheDims: function () {
- this._cachedWidth = this.width;
- this._cachedHeight = this.height;
- },
-
- testCacheDims: function () {
- return this._cachedWidth == this.width && this._cachedHeight == this.height;
- },
-
- // Invoked when the given tab is added to this window
- newTab: function (tab) {
- let controller = new PreviewController(this, tab);
- // It's OK to add the preview now while the favicon still loads.
- this.previews.set(tab, controller.preview);
- AeroPeek.addPreview(controller.preview);
- // updateTitleAndTooltip relies on having controller.preview which is lazily resolved.
- // Now that we've updated this.previews, it will resolve successfully.
- controller.updateTitleAndTooltip();
- },
-
- createTabPreview: function (controller) {
- let docShell = this.win
- .QueryInterface(Ci.nsIInterfaceRequestor)
- .getInterface(Ci.nsIWebNavigation)
- .QueryInterface(Ci.nsIDocShell);
- let preview = AeroPeek.taskbar.createTaskbarTabPreview(docShell, controller);
- preview.visible = AeroPeek.enabled;
- preview.active = this.tabbrowser.selectedTab == controller.tab;
- this.onLinkIconAvailable(controller.tab.linkedBrowser,
- controller.tab.getAttribute("image"));
- return preview;
- },
-
- // Invoked when the given tab is closed
- removeTab: function (tab) {
- let preview = this.previewFromTab(tab);
- preview.active = false;
- preview.visible = false;
- preview.move(null);
- preview.controller.wrappedJSObject.destroy();
-
- this.previews.delete(tab);
- AeroPeek.removePreview(preview);
- },
-
- get enabled () {
- return this._enabled;
- },
-
- set enabled (enable) {
- this._enabled = enable;
- // Because making a tab visible requires that the tab it is next to be
- // visible, it is far simpler to unset the 'next' tab and recreate them all
- // at once.
- for (let [, preview] of this.previews) {
- preview.move(null);
- preview.visible = enable;
- }
- this.updateTabOrdering();
- },
-
- previewFromTab: function (tab) {
- return this.previews.get(tab);
- },
-
- updateTabOrdering: function () {
- let previews = this.previews;
- let tabs = this.tabbrowser.tabs;
-
- // Previews are internally stored using a map, so we need to iterate the
- // tabbrowser's array of tabs to retrieve previews in the same order.
- let inorder = [];
- for (let t of tabs) {
- if (previews.has(t)) {
- inorder.push(previews.get(t));
- }
- }
-
- // 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 = inorder.length - 1; i >= 0; i--) {
- inorder[i].move(inorder[i + 1] || null);
- }
- },
-
- // 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":
- this.updateTabOrdering();
- break;
- case "resize":
- if (!AeroPeek._prefenabled)
- return;
- this.onResize();
- break;
- }
- },
-
- // Set or reset a timer that will invalidate visible thumbnails soon.
- setInvalidationTimer: function () {
- if (!this.invalidateTimer) {
- this.invalidateTimer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
- }
- this.invalidateTimer.cancel();
-
- // delay 1 second before invalidating
- this.invalidateTimer.initWithCallback(() => {
- // invalidate every preview. note the internal implementation of
- // invalidate ignores thumbnails that aren't visible.
- this.previews.forEach(function (aPreview) {
- let controller = aPreview.controller.wrappedJSObject;
- if (!controller.testCacheBrowserDims()) {
- controller.cacheBrowserDims();
- aPreview.invalidate();
- }
- });
- }, 1000, Ci.nsITimer.TYPE_ONE_SHOT);
- },
-
- onResize: function () {
- // Specific to a window.
-
- // Call invalidate on each tab thumbnail so that Windows will request an
- // updated image. However don't do this repeatedly across multiple resize
- // events triggered during window border drags.
-
- if (this.testCacheDims()) {
- return;
- }
-
- // update the window dims on our TabWindow object.
- this.cacheDims();
-
- // invalidate soon
- this.setInvalidationTimer();
- },
-
- invalidateTabPreview: function(aBrowser) {
- for (let [tab, preview] of this.previews) {
- if (aBrowser == tab.linkedBrowser) {
- preview.invalidate();
- break;
- }
- }
- },
-
- // Browser progress listener
-
- onLocationChange: function (aBrowser) {
- // I'm not sure we need this, onStateChange does a really good job
- // of picking up page changes.
- // this.invalidateTabPreview(aBrowser);
- },
-
- onStateChange: function (aBrowser, aWebProgress, aRequest, aStateFlags, aStatus) {
- if (aStateFlags & Ci.nsIWebProgressListener.STATE_STOP &&
- aStateFlags & Ci.nsIWebProgressListener.STATE_IS_NETWORK) {
- this.invalidateTabPreview(aBrowser);
- }
- },
-
- directRequestProtocols: new Set([
- "file", "chrome", "resource", "about"
- ]),
- onLinkIconAvailable: function (aBrowser, aIconURL) {
- let requestURL = null;
- if (aIconURL) {
- let shouldRequestFaviconURL = true;
- try {
- let urlObject = NetUtil.newURI(aIconURL);
- shouldRequestFaviconURL =
- !this.directRequestProtocols.has(urlObject.scheme);
- } catch (ex) {}
-
- requestURL = shouldRequestFaviconURL ?
- "moz-anno:favicon:" + aIconURL :
- aIconURL;
- }
- let isDefaultFavicon = !requestURL;
- getFaviconAsImage(
- requestURL,
- PrivateBrowsingUtils.isWindowPrivate(this.win),
- img => {
- let index = this.tabbrowser.browsers.indexOf(aBrowser);
- // Only add it if we've found the index and the URI is still the same.
- // The tab could have closed, and there's no guarantee the icons
- // will have finished fetching 'in order'.
- if (index != -1) {
- let tab = this.tabbrowser.tabs[index];
- let preview = this.previews.get(tab);
- if (tab.getAttribute("image") == aIconURL ||
- (!preview.icon && isDefaultFavicon)) {
- preview.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: false,
-
- _enabled: true,
-
- initialized: false,
-
- // 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, true);
- this.enabled = this._prefenabled = this.prefs.getBoolPref(TOGGLE_PREF_NAME);
- this.initialized = true;
- },
-
- destroy: function destroy() {
- this._enabled = false;
-
- 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;
- });
- },
-
- get _prefenabled() {
- return this.__prefenabled;
- },
-
- set _prefenabled(enable) {
- if (enable == this.__prefenabled) {
- return;
- }
- this.__prefenabled = enable;
-
- if (enable) {
- this.enable();
- } else {
- this.disable();
- }
- },
-
- _observersAdded: false,
-
- enable() {
- if (!this._observersAdded) {
- this.prefs.addObserver(DISABLE_THRESHOLD_PREF_NAME, this, true);
- this.prefs.addObserver(CACHE_EXPIRATION_TIME_PREF_NAME, this, true);
- PlacesUtils.history.addObserver(this, true);
- this._observersAdded = true;
- }
-
- this.cacheLifespan = this.prefs.getIntPref(CACHE_EXPIRATION_TIME_PREF_NAME);
-
- this.maxpreviews = this.prefs.getIntPref(DISABLE_THRESHOLD_PREF_NAME);
-
- // If the user toggled us on/off while the browser was already up
- // (rather than this code running on startup because the pref was
- // already set to true), we must initialize previews for open windows:
- if (this.initialized) {
- let browserWindows = Services.wm.getEnumerator("navigator:browser");
- while (browserWindows.hasMoreElements()) {
- let win = browserWindows.getNext();
- if (!win.closed) {
- this.onOpenWindow(win);
- }
- }
- }
- },
-
- disable() {
- while (this.windows.length) {
- // We can't call onCloseWindow here because it'll bail if we're not
- // enabled.
- let tabWinObject = this.windows[0];
- tabWinObject.destroy(); // This will remove us from the array.
- delete tabWinObject.win.gTaskbarTabGroup; // Tidy up the window.
- }
- },
-
- 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._prefenabled) {
- return;
- }
- this.enabled = this.previews.length <= this.maxpreviews;
- },
-
- onOpenWindow: function (win) {
- // This occurs when the taskbar service is not available (xp, vista)
- if (!this.available || !this._prefenabled)
- return;
-
- win.gTaskbarTabGroup = new TabWindow(win);
- },
-
- onCloseWindow: function (win) {
- // This occurs when the taskbar service is not available (xp, vista)
- if (!this.available || !this._prefenabled)
- 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) {
- if (aTopic == "nsPref:changed" && aData == TOGGLE_PREF_NAME) {
- this._prefenabled = this.prefs.getBoolPref(TOGGLE_PREF_NAME);
- }
- if (!this._prefenabled) {
- return;
- }
- switch (aTopic) {
- case "nsPref:changed":
- if (aData == CACHE_EXPIRATION_TIME_PREF_NAME)
- break;
-
- 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;
- }
- },
-
- /* nsINavHistoryObserver implementation */
- onBeginUpdateBatch() {},
- onEndUpdateBatch() {},
- onVisit() {},
- onTitleChanged() {},
- onFrecencyChanged() {},
- onManyFrecenciesChanged() {},
- onDeleteURI() {},
- onClearHistory() {},
- onDeleteVisits() {},
- onPageChanged(uri, changedConst, newValue) {
- if (this.enabled && changedConst == Ci.nsINavHistoryObserver.ATTRIBUTE_FAVICON) {
- for (let win of this.windows) {
- for (let [tab, ] of win.previews) {
- if (tab.getAttribute("image") == newValue) {
- win.onLinkIconAvailable(tab.linkedBrowser, newValue);
- }
- }
- }
- }
- },
-
- QueryInterface: XPCOMUtils.generateQI([
- Ci.nsISupportsWeakReference,
- Ci.nsINavHistoryObserver,
- Ci.nsIObserver
- ]),
-};
-
-XPCOMUtils.defineLazyGetter(AeroPeek, "cacheTimer", () =>
- Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer)
-);
-
-XPCOMUtils.defineLazyServiceGetter(AeroPeek, "prefs",
- "@mozilla.org/preferences-service;1",
- "nsIPrefBranch");
-
-AeroPeek.initialize();