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gecko-dev/browser/components/tabview/tabitems.js

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JavaScript
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/* 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/. */
// **********
// Title: tabitems.js
// ##########
// Class: TabItem
// An <Item> that represents a tab. Also implements the <Subscribable> interface.
//
// Parameters:
// tab - a xul:tab
function TabItem(tab, options) {
Utils.assert(tab, "tab");
this.tab = tab;
// register this as the tab's tabItem
this.tab._tabViewTabItem = this;
if (!options)
options = {};
// ___ set up div
document.body.appendChild(TabItems.fragment().cloneNode(true));
// The document fragment contains just one Node
// As per DOM3 appendChild: it will then be the last child
let div = document.body.lastChild;
let $div = iQ(div);
this._showsCachedData = false;
this.canvasSizeForced = false;
this.$thumb = iQ('.thumb', $div);
this.$fav = iQ('.favicon', $div);
this.$tabTitle = iQ('.tab-title', $div);
this.$canvas = iQ('.thumb canvas', $div);
this.$cachedThumb = iQ('img.cached-thumb', $div);
this.$favImage = iQ('.favicon>img', $div);
this.$close = iQ('.close', $div);
this.tabCanvas = new TabCanvas(this.tab, this.$canvas[0]);
this._hidden = false;
this.isATabItem = true;
this.keepProportional = true;
this._hasBeenDrawn = false;
this._reconnected = false;
this.isDragging = false;
this.isStacked = false;
// Read off the total vertical and horizontal padding on the tab container
// and cache this value, as it must be the same for every TabItem.
if (Utils.isEmptyObject(TabItems.tabItemPadding)) {
TabItems.tabItemPadding.x = parseInt($div.css('padding-left'))
+ parseInt($div.css('padding-right'));
TabItems.tabItemPadding.y = parseInt($div.css('padding-top'))
+ parseInt($div.css('padding-bottom'));
}
this.bounds = new Rect(0,0,1,1);
this._lastTabUpdateTime = Date.now();
// ___ superclass setup
this._init(div);
// ___ drag/drop
// override dropOptions with custom tabitem methods
this.dropOptions.drop = function(e) {
let groupItem = drag.info.item.parent;
groupItem.add(drag.info.$el);
};
this.draggable();
let self = this;
// ___ more div setup
$div.mousedown(function(e) {
if (!Utils.isRightClick(e))
self.lastMouseDownTarget = e.target;
});
$div.mouseup(function(e) {
var same = (e.target == self.lastMouseDownTarget);
self.lastMouseDownTarget = null;
if (!same)
return;
// press close button or middle mouse click
if (iQ(e.target).hasClass("close") || Utils.isMiddleClick(e)) {
self.closedManually = true;
self.close();
} else {
if (!Items.item(this).isDragging)
self.zoomIn();
}
});
this.droppable(true);
this.$close.attr("title", tabbrowserString("tabs.closeTab"));
TabItems.register(this);
// ___ reconnect to data from Storage
if (!TabItems.reconnectingPaused())
this._reconnect(options);
};
TabItem.prototype = Utils.extend(new Item(), new Subscribable(), {
// ----------
// Function: toString
// Prints [TabItem (tab)] for debug use
toString: function TabItem_toString() {
return "[TabItem (" + this.tab + ")]";
},
// ----------
// Function: forceCanvasSize
// Repaints the thumbnail with the given resolution, and forces it
// to stay that resolution until unforceCanvasSize is called.
forceCanvasSize: function TabItem_forceCanvasSize(w, h) {
this.canvasSizeForced = true;
this.$canvas[0].width = w;
this.$canvas[0].height = h;
this.tabCanvas.paint();
},
// ----------
// Function: unforceCanvasSize
// Stops holding the thumbnail resolution; allows it to shift to the
// size of thumbnail on screen. Note that this call does not nest, unlike
// <TabItems.resumePainting>; if you call forceCanvasSize multiple
// times, you just need a single unforce to clear them all.
unforceCanvasSize: function TabItem_unforceCanvasSize() {
this.canvasSizeForced = false;
},
// ----------
// Function: isShowingCachedData
// Returns a boolean indicates whether the cached data is being displayed or
// not.
isShowingCachedData: function TabItem_isShowingCachedData() {
return this._showsCachedData;
},
// ----------
// Function: showCachedData
// Shows the cached data i.e. image and title. Note: this method should only
// be called at browser startup with the cached data avaliable.
showCachedData: function TabItem_showCachedData() {
let {title, url} = this.getTabState();
let thumbnailURL = gPageThumbnails.getThumbnailURL(url);
this.$cachedThumb.attr("src", thumbnailURL).show();
this.$canvas.css({opacity: 0});
let tooltip = (title && title != url ? title + "\n" + url : url);
this.$tabTitle.text(title).attr("title", tooltip);
this._showsCachedData = true;
},
// ----------
// Function: hideCachedData
// Hides the cached data i.e. image and title and show the canvas.
hideCachedData: function TabItem_hideCachedData() {
this.$cachedThumb.attr("src", "").hide();
this.$canvas.css({opacity: 1.0});
this._showsCachedData = false;
},
// ----------
// Function: getStorageData
// Get data to be used for persistent storage of this object.
getStorageData: function TabItem_getStorageData() {
let data = {
groupID: (this.parent ? this.parent.id : 0)
};
if (this.parent && this.parent.getActiveTab() == this)
data.active = true;
return data;
},
// ----------
// Function: save
// Store persistent for this object.
save: function TabItem_save() {
try {
if (!this.tab || !Utils.isValidXULTab(this.tab) || !this._reconnected) // too soon/late to save
return;
let data = this.getStorageData();
if (TabItems.storageSanity(data))
Storage.saveTab(this.tab, data);
} catch(e) {
Utils.log("Error in saving tab value: "+e);
}
},
// ----------
// Function: _getCurrentTabStateEntry
// Returns the current tab state's active history entry.
_getCurrentTabStateEntry: function TabItem__getCurrentTabStateEntry() {
let tabState = Storage.getTabState(this.tab);
if (tabState) {
let index = (tabState.index || tabState.entries.length) - 1;
if (index in tabState.entries)
return tabState.entries[index];
}
return null;
},
// ----------
// Function: getTabState
// Returns the current tab state, i.e. the title and URL of the active
// history entry.
getTabState: function TabItem_getTabState() {
let entry = this._getCurrentTabStateEntry();
let title = "";
let url = "";
if (entry) {
if (entry.title)
title = entry.title;
url = entry.url;
} else {
url = this.tab.linkedBrowser.currentURI.spec;
}
return {title: title, url: url};
},
// ----------
// Function: _reconnect
// Load the reciever's persistent data from storage. If there is none,
// treats it as a new tab.
//
// Parameters:
// options - an object with additional parameters, see below
//
// Possible options:
// groupItemId - if the tab doesn't have any data associated with it and
// groupItemId is available, add the tab to that group.
_reconnect: function TabItem__reconnect(options) {
Utils.assertThrow(!this._reconnected, "shouldn't already be reconnected");
Utils.assertThrow(this.tab, "should have a xul:tab");
let tabData = Storage.getTabData(this.tab);
let groupItem;
if (tabData && TabItems.storageSanity(tabData)) {
// Show the cached data while we're waiting for the tabItem to be updated.
// If the tab isn't restored yet this acts as a placeholder until it is.
this.showCachedData();
if (this.parent)
this.parent.remove(this, {immediately: true});
if (tabData.groupID)
groupItem = GroupItems.groupItem(tabData.groupID);
else
groupItem = new GroupItem([], {immediately: true, bounds: tabData.bounds});
if (groupItem) {
groupItem.add(this, {immediately: true});
// restore the active tab for each group between browser sessions
if (tabData.active)
groupItem.setActiveTab(this);
// if it matches the selected tab or no active tab and the browser
// tab is hidden, the active group item would be set.
if (this.tab.selected ||
(!GroupItems.getActiveGroupItem() && !this.tab.hidden))
UI.setActive(this.parent);
}
} else {
if (options && options.groupItemId)
groupItem = GroupItems.groupItem(options.groupItemId);
if (groupItem) {
groupItem.add(this, {immediately: true});
} else {
// create tab group by double click is handled in UI_init().
GroupItems.newTab(this, {immediately: true});
}
}
this._reconnected = true;
this.save();
this._sendToSubscribers("reconnected");
},
// ----------
// Function: setHidden
// Hide/unhide this item
setHidden: function TabItem_setHidden(val) {
if (val)
this.addClass("tabHidden");
else
this.removeClass("tabHidden");
this._hidden = val;
},
// ----------
// Function: getHidden
// Return hide state of item
getHidden: function TabItem_getHidden() {
return this._hidden;
},
// ----------
// Function: setBounds
// Moves this item to the specified location and size.
//
// Parameters:
// rect - a <Rect> giving the new bounds
// immediately - true if it should not animate; default false
// options - an object with additional parameters, see below
//
// Possible options:
// force - true to always update the DOM even if the bounds haven't changed; default false
setBounds: function TabItem_setBounds(inRect, immediately, options) {
Utils.assert(Utils.isRect(inRect), 'TabItem.setBounds: rect is not a real rectangle!');
if (!options)
options = {};
// force the input size to be valid
let validSize = TabItems.calcValidSize(
new Point(inRect.width, inRect.height),
{hideTitle: (this.isStacked || options.hideTitle === true)});
let rect = new Rect(inRect.left, inRect.top,
validSize.x, validSize.y);
var css = {};
if (rect.left != this.bounds.left || options.force)
css.left = rect.left;
if (rect.top != this.bounds.top || options.force)
css.top = rect.top;
if (rect.width != this.bounds.width || options.force) {
css.width = rect.width - TabItems.tabItemPadding.x;
css.fontSize = TabItems.getFontSizeFromWidth(rect.width);
css.fontSize += 'px';
}
if (rect.height != this.bounds.height || options.force) {
css.height = rect.height - TabItems.tabItemPadding.y;
if (!this.isStacked)
css.height -= TabItems.fontSizeRange.max;
}
if (Utils.isEmptyObject(css))
return;
this.bounds.copy(rect);
// If this is a brand new tab don't animate it in from
// a random location (i.e., from [0,0]). Instead, just
// have it appear where it should be.
if (immediately || (!this._hasBeenDrawn)) {
this.$container.css(css);
} else {
TabItems.pausePainting();
this.$container.animate(css, {
duration: 200,
easing: "tabviewBounce",
complete: function() {
TabItems.resumePainting();
}
});
}
if (css.fontSize && !(this.parent && this.parent.isStacked())) {
if (css.fontSize < TabItems.fontSizeRange.min)
immediately ? this.$tabTitle.hide() : this.$tabTitle.fadeOut();
else
immediately ? this.$tabTitle.show() : this.$tabTitle.fadeIn();
}
if (css.width) {
TabItems.update(this.tab);
let widthRange, proportion;
if (this.parent && this.parent.isStacked()) {
if (UI.rtl) {
this.$fav.css({top:0, right:0});
} else {
this.$fav.css({top:0, left:0});
}
widthRange = new Range(70, 90);
proportion = widthRange.proportion(css.width); // between 0 and 1
} else {
if (UI.rtl) {
this.$fav.css({top:4, right:2});
} else {
this.$fav.css({top:4, left:4});
}
widthRange = new Range(40, 45);
proportion = widthRange.proportion(css.width); // between 0 and 1
}
if (proportion <= .1)
this.$close.hide();
else
this.$close.show().css({opacity:proportion});
var pad = 1 + 5 * proportion;
var alphaRange = new Range(0.1,0.2);
this.$fav.css({
"-moz-padding-start": pad + "px",
"-moz-padding-end": pad + 2 + "px",
"padding-top": pad + "px",
"padding-bottom": pad + "px",
"border-color": "rgba(0,0,0,"+ alphaRange.scale(proportion) +")",
});
}
this._hasBeenDrawn = true;
UI.clearShouldResizeItems();
rect = this.getBounds(); // ensure that it's a <Rect>
Utils.assert(Utils.isRect(this.bounds), 'TabItem.setBounds: this.bounds is not a real rectangle!');
if (!this.parent && Utils.isValidXULTab(this.tab))
this.setTrenches(rect);
this.save();
},
// ----------
// Function: setZ
// Sets the z-index for this item.
setZ: function TabItem_setZ(value) {
this.zIndex = value;
this.$container.css({zIndex: value});
},
// ----------
// Function: close
// Closes this item (actually closes the tab associated with it, which automatically
// closes the item.
// Parameters:
// groupClose - true if this method is called by group close action.
// Returns true if this tab is removed.
close: function TabItem_close(groupClose) {
// When the last tab is closed, put a new tab into closing tab's group. If
// closing tab doesn't belong to a group and no empty group, create a new
// one for the new tab.
if (!groupClose && gBrowser.tabs.length == 1) {
let group = this.tab._tabViewTabItem.parent;
group.newTab(null, { closedLastTab: true });
}
// when "TabClose" event is fired, the browser tab is about to close and our
// item "close" is fired before the browser tab actually get closed.
// Therefore, we need "tabRemoved" event below.
gBrowser.removeTab(this.tab);
let tabClosed = !this.tab;
if (tabClosed)
this._sendToSubscribers("tabRemoved");
// No need to explicitly delete the tab data, becasue sessionstore data
// associated with the tab will automatically go away
return tabClosed;
},
// ----------
// Function: addClass
// Adds the specified CSS class to this item's container DOM element.
addClass: function TabItem_addClass(className) {
this.$container.addClass(className);
},
// ----------
// Function: removeClass
// Removes the specified CSS class from this item's container DOM element.
removeClass: function TabItem_removeClass(className) {
this.$container.removeClass(className);
},
// ----------
// Function: makeActive
// Updates this item to visually indicate that it's active.
makeActive: function TabItem_makeActive() {
this.$container.addClass("focus");
if (this.parent)
this.parent.setActiveTab(this);
},
// ----------
// Function: makeDeactive
// Updates this item to visually indicate that it's not active.
makeDeactive: function TabItem_makeDeactive() {
this.$container.removeClass("focus");
},
// ----------
// Function: zoomIn
// Allows you to select the tab and zoom in on it, thereby bringing you
// to the tab in Firefox to interact with.
// Parameters:
// isNewBlankTab - boolean indicates whether it is a newly opened blank tab.
zoomIn: function TabItem_zoomIn(isNewBlankTab) {
// don't allow zoom in if its group is hidden
if (this.parent && this.parent.hidden)
return;
let self = this;
let $tabEl = this.$container;
let $canvas = this.$canvas;
Search.hide();
UI.setActive(this);
TabItems._update(this.tab, {force: true});
// Zoom in!
let tab = this.tab;
function onZoomDone() {
$canvas.css({ 'transform': null });
$tabEl.removeClass("front");
UI.goToTab(tab);
// tab might not be selected because hideTabView() is invoked after
// UI.goToTab() so we need to setup everything for the gBrowser.selectedTab
if (!tab.selected) {
UI.onTabSelect(gBrowser.selectedTab);
} else {
if (isNewBlankTab)
gWindow.gURLBar.focus();
}
if (self.parent && self.parent.expanded)
self.parent.collapse();
self._sendToSubscribers("zoomedIn");
}
let animateZoom = gPrefBranch.getBoolPref("animate_zoom");
if (animateZoom) {
let transform = this.getZoomTransform();
TabItems.pausePainting();
if (this.parent && this.parent.expanded)
$tabEl.removeClass("stack-trayed");
$tabEl.addClass("front");
$canvas
.css({ 'transform-origin': transform.transformOrigin })
.animate({ 'transform': transform.transform }, {
duration: 230,
easing: 'fast',
complete: function() {
onZoomDone();
setTimeout(function() {
TabItems.resumePainting();
}, 0);
}
});
} else {
setTimeout(onZoomDone, 0);
}
},
// ----------
// Function: zoomOut
// Handles the zoom down animation after returning to TabView.
// It is expected that this routine will be called from the chrome thread
//
// Parameters:
// complete - a function to call after the zoom down animation
zoomOut: function TabItem_zoomOut(complete) {
let $tab = this.$container, $canvas = this.$canvas;
var self = this;
let onZoomDone = function onZoomDone() {
$tab.removeClass("front");
$canvas.css("transform", null);
if (typeof complete == "function")
complete();
};
UI.setActive(this);
TabItems._update(this.tab, {force: true});
$tab.addClass("front");
let animateZoom = gPrefBranch.getBoolPref("animate_zoom");
if (animateZoom) {
// The scaleCheat of 2 here is a clever way to speed up the zoom-out
// code. See getZoomTransform() below.
let transform = this.getZoomTransform(2);
TabItems.pausePainting();
$canvas.css({
'transform': transform.transform,
'transform-origin': transform.transformOrigin
});
$canvas.animate({ "transform": "scale(1.0)" }, {
duration: 300,
easing: 'cubic-bezier', // note that this is legal easing, even without parameters
complete: function() {
TabItems.resumePainting();
onZoomDone();
}
});
} else {
onZoomDone();
}
},
// ----------
// Function: getZoomTransform
// Returns the transform function which represents the maximum bounds of the
// tab thumbnail in the zoom animation.
getZoomTransform: function TabItem_getZoomTransform(scaleCheat) {
// Taking the bounds of the container (as opposed to the canvas) makes us
// immune to any transformations applied to the canvas.
let { left, top, width, height, right, bottom } = this.$container.bounds();
let { innerWidth: windowWidth, innerHeight: windowHeight } = window;
// The scaleCheat is a clever way to speed up the zoom-in code.
// Because image scaling is slowest on big images, we cheat and stop
// the image at scaled-down size and placed accordingly. Because the
// animation is fast, you can't see the difference but it feels a lot
// zippier. The only trick is choosing the right animation function so
// that you don't see a change in percieved animation speed from frame #1
// (the tab) to frame #2 (the half-size image) to frame #3 (the first frame
// of real animation). Choosing an animation that starts fast is key.
if (!scaleCheat)
scaleCheat = 1.7;
let zoomWidth = width + (window.innerWidth - width) / scaleCheat;
let zoomScaleFactor = zoomWidth / width;
let zoomHeight = height * zoomScaleFactor;
let zoomTop = top * (1 - 1/scaleCheat);
let zoomLeft = left * (1 - 1/scaleCheat);
let xOrigin = (left - zoomLeft) / ((left - zoomLeft) + (zoomLeft + zoomWidth - right)) * 100;
let yOrigin = (top - zoomTop) / ((top - zoomTop) + (zoomTop + zoomHeight - bottom)) * 100;
return {
transformOrigin: xOrigin + "% " + yOrigin + "%",
transform: "scale(" + zoomScaleFactor + ")"
};
},
// ----------
// Function: updateCanvas
// Updates the tabitem's canvas.
updateCanvas: function TabItem_updateCanvas() {
// ___ thumbnail
let $canvas = this.$canvas;
if (!this.canvasSizeForced) {
let w = $canvas.width();
let h = $canvas.height();
if (w != $canvas[0].width || h != $canvas[0].height) {
$canvas[0].width = w;
$canvas[0].height = h;
}
}
TabItems._lastUpdateTime = Date.now();
this._lastTabUpdateTime = TabItems._lastUpdateTime;
if (this.tabCanvas)
this.tabCanvas.paint();
// ___ cache
if (this.isShowingCachedData())
this.hideCachedData();
}
});
// ##########
// Class: TabItems
// Singleton for managing <TabItem>s
let TabItems = {
minTabWidth: 40,
tabWidth: 160,
tabHeight: 120,
tabAspect: 0, // set in init
invTabAspect: 0, // set in init
fontSize: 9,
fontSizeRange: new Range(8,15),
_fragment: null,
items: [],
paintingPaused: 0,
_tabsWaitingForUpdate: null,
_heartbeat: null, // see explanation at startHeartbeat() below
_heartbeatTiming: 200, // milliseconds between calls
_maxTimeForUpdating: 200, // milliseconds that consecutive updates can take
_lastUpdateTime: Date.now(),
_eventListeners: [],
_pauseUpdateForTest: false,
_reconnectingPaused: false,
tabItemPadding: {},
_mozAfterPaintHandler: null,
// ----------
// Function: toString
// Prints [TabItems count=count] for debug use
toString: function TabItems_toString() {
return "[TabItems count=" + this.items.length + "]";
},
// ----------
// Function: init
// Set up the necessary tracking to maintain the <TabItems>s.
init: function TabItems_init() {
Utils.assert(window.AllTabs, "AllTabs must be initialized first");
let self = this;
// Set up tab priority queue
this._tabsWaitingForUpdate = new TabPriorityQueue();
this.minTabHeight = this.minTabWidth * this.tabHeight / this.tabWidth;
this.tabAspect = this.tabHeight / this.tabWidth;
this.invTabAspect = 1 / this.tabAspect;
let $canvas = iQ("<canvas>")
.attr('moz-opaque', '');
$canvas.appendTo(iQ("body"));
$canvas.hide();
let mm = gWindow.messageManager;
this._mozAfterPaintHandler = this.onMozAfterPaint.bind(this);
mm.addMessageListener("Panorama:MozAfterPaint", this._mozAfterPaintHandler);
// When a tab is opened, create the TabItem
this._eventListeners.open = function (event) {
let tab = event.target;
if (!tab.pinned)
self.link(tab);
}
// When a tab's content is loaded, show the canvas and hide the cached data
// if necessary.
this._eventListeners.attrModified = function (event) {
let tab = event.target;
if (!tab.pinned)
self.update(tab);
}
// When a tab is closed, unlink.
this._eventListeners.close = function (event) {
let tab = event.target;
// XXX bug #635975 - don't unlink the tab if the dom window is closing.
if (!tab.pinned && !UI.isDOMWindowClosing)
self.unlink(tab);
}
for (let name in this._eventListeners) {
AllTabs.register(name, this._eventListeners[name]);
}
let activeGroupItem = GroupItems.getActiveGroupItem();
let activeGroupItemId = activeGroupItem ? activeGroupItem.id : null;
// For each tab, create the link.
AllTabs.tabs.forEach(function (tab) {
if (tab.pinned)
return;
let options = {immediately: true};
// if tab is visible in the tabstrip and doesn't have any data stored in
// the session store (see TabItem__reconnect), it implies that it is a
// new tab which is created before Panorama is initialized. Therefore,
// passing the active group id to the link() method for setting it up.
if (!tab.hidden && activeGroupItemId)
options.groupItemId = activeGroupItemId;
self.link(tab, options);
self.update(tab);
});
},
// ----------
// Function: uninit
uninit: function TabItems_uninit() {
let mm = gWindow.messageManager;
mm.removeMessageListener("Panorama:MozAfterPaint", this._mozAfterPaintHandler);
for (let name in this._eventListeners) {
AllTabs.unregister(name, this._eventListeners[name]);
}
this.items.forEach(function(tabItem) {
delete tabItem.tab._tabViewTabItem;
for (let x in tabItem) {
if (typeof tabItem[x] == "object")
tabItem[x] = null;
}
});
this.items = null;
this._eventListeners = null;
this._lastUpdateTime = null;
this._tabsWaitingForUpdate.clear();
},
// ----------
// Function: fragment
// Return a DocumentFragment which has a single <div> child. This child node
// will act as a template for all TabItem containers.
// The first call of this function caches the DocumentFragment in _fragment.
fragment: function TabItems_fragment() {
if (this._fragment)
return this._fragment;
let div = document.createElement("div");
div.classList.add("tab");
div.innerHTML = "<div class='thumb'>" +
"<img class='cached-thumb' style='display:none'/><canvas moz-opaque/></div>" +
"<div class='favicon'><img/></div>" +
"<span class='tab-title'>&nbsp;</span>" +
"<div class='close'></div>";
this._fragment = document.createDocumentFragment();
this._fragment.appendChild(div);
return this._fragment;
},
// Function: _isComplete
// Checks whether the xul:tab has fully loaded and calls a callback with a
// boolean indicates whether the tab is loaded or not.
_isComplete: function TabItems__isComplete(tab, callback) {
Utils.assertThrow(tab, "tab");
// A pending tab can't be complete, yet.
if (tab.hasAttribute("pending")) {
setTimeout(() => callback(false));
return;
}
let mm = tab.linkedBrowser.messageManager;
let message = "Panorama:isDocumentLoaded";
mm.addMessageListener(message, function onMessage(cx) {
mm.removeMessageListener(cx.name, onMessage);
callback(cx.json.isLoaded);
});
mm.sendAsyncMessage(message);
},
// ----------
// Function: onMozAfterPaint
// Called when a web page is painted.
onMozAfterPaint: function TabItems_onMozAfterPaint(cx) {
let index = gBrowser.browsers.indexOf(cx.target);
if (index == -1)
return;
let tab = gBrowser.tabs[index];
if (!tab.pinned)
this.update(tab);
},
// ----------
// Function: update
// Takes in a xul:tab.
update: function TabItems_update(tab) {
try {
Utils.assertThrow(tab, "tab");
Utils.assertThrow(!tab.pinned, "shouldn't be an app tab");
Utils.assertThrow(tab._tabViewTabItem, "should already be linked");
let shouldDefer = (
this.isPaintingPaused() ||
this._tabsWaitingForUpdate.hasItems() ||
Date.now() - this._lastUpdateTime < this._heartbeatTiming
);
if (shouldDefer) {
this._tabsWaitingForUpdate.push(tab);
this.startHeartbeat();
} else
this._update(tab);
} catch(e) {
Utils.log(e);
}
},
// ----------
// Function: _update
// Takes in a xul:tab.
//
// Parameters:
// tab - a xul tab to update
// options - an object with additional parameters, see below
//
// Possible options:
// force - true to always update the tab item even if it's incomplete
_update: function TabItems__update(tab, options) {
try {
if (this._pauseUpdateForTest)
return;
Utils.assertThrow(tab, "tab");
// ___ get the TabItem
Utils.assertThrow(tab._tabViewTabItem, "must already be linked");
let tabItem = tab._tabViewTabItem;
// Even if the page hasn't loaded, display the favicon and title
// ___ icon
FavIcons.getFavIconUrlForTab(tab, function TabItems__update_getFavIconUrlCallback(iconUrl) {
let favImage = tabItem.$favImage[0];
let fav = tabItem.$fav;
if (iconUrl) {
if (favImage.src != iconUrl)
favImage.src = iconUrl;
fav.show();
} else {
if (favImage.hasAttribute("src"))
favImage.removeAttribute("src");
fav.hide();
}
tabItem._sendToSubscribers("iconUpdated");
});
// ___ label
let label = tab.label;
let $name = tabItem.$tabTitle;
if ($name.text() != label)
$name.text(label);
// ___ remove from waiting list now that we have no other
// early returns
this._tabsWaitingForUpdate.remove(tab);
// ___ URL
let tabUrl = tab.linkedBrowser.currentURI.spec;
let tooltip = (label == tabUrl ? label : label + "\n" + tabUrl);
tabItem.$container.attr("title", tooltip);
// ___ Make sure the tab is complete and ready for updating.
if (options && options.force) {
tabItem.updateCanvas();
tabItem._sendToSubscribers("updated");
} else {
this._isComplete(tab, function TabItems__update_isComplete(isComplete) {
if (!Utils.isValidXULTab(tab) || tab.pinned)
return;
if (isComplete) {
tabItem.updateCanvas();
tabItem._sendToSubscribers("updated");
} else {
this._tabsWaitingForUpdate.push(tab);
}
}.bind(this));
}
} catch(e) {
Utils.log(e);
}
},
// ----------
// Function: link
// Takes in a xul:tab, creates a TabItem for it and adds it to the scene.
link: function TabItems_link(tab, options) {
try {
Utils.assertThrow(tab, "tab");
Utils.assertThrow(!tab.pinned, "shouldn't be an app tab");
Utils.assertThrow(!tab._tabViewTabItem, "shouldn't already be linked");
new TabItem(tab, options); // sets tab._tabViewTabItem to itself
} catch(e) {
Utils.log(e);
}
},
// ----------
// Function: unlink
// Takes in a xul:tab and destroys the TabItem associated with it.
unlink: function TabItems_unlink(tab) {
try {
Utils.assertThrow(tab, "tab");
Utils.assertThrow(tab._tabViewTabItem, "should already be linked");
// note that it's ok to unlink an app tab; see .handleTabUnpin
this.unregister(tab._tabViewTabItem);
tab._tabViewTabItem._sendToSubscribers("close");
tab._tabViewTabItem.$container.remove();
tab._tabViewTabItem.removeTrenches();
Items.unsquish(null, tab._tabViewTabItem);
tab._tabViewTabItem.tab = null;
tab._tabViewTabItem.tabCanvas.tab = null;
tab._tabViewTabItem.tabCanvas = null;
tab._tabViewTabItem = null;
Storage.saveTab(tab, null);
this._tabsWaitingForUpdate.remove(tab);
} catch(e) {
Utils.log(e);
}
},
// ----------
// when a tab becomes pinned, destroy its TabItem
handleTabPin: function TabItems_handleTabPin(xulTab) {
this.unlink(xulTab);
},
// ----------
// when a tab becomes unpinned, create a TabItem for it
handleTabUnpin: function TabItems_handleTabUnpin(xulTab) {
this.link(xulTab);
this.update(xulTab);
},
// ----------
// Function: startHeartbeat
// Start a new heartbeat if there isn't one already started.
// The heartbeat is a chain of setTimeout calls that allows us to spread
// out update calls over a period of time.
// _heartbeat is used to make sure that we don't add multiple
// setTimeout chains.
startHeartbeat: function TabItems_startHeartbeat() {
if (!this._heartbeat) {
let self = this;
this._heartbeat = setTimeout(function() {
self._checkHeartbeat();
}, this._heartbeatTiming);
}
},
// ----------
// Function: _checkHeartbeat
// This periodically checks for tabs waiting to be updated, and calls
// _update on them.
// Should only be called by startHeartbeat and resumePainting.
_checkHeartbeat: function TabItems__checkHeartbeat() {
this._heartbeat = null;
if (this.isPaintingPaused())
return;
// restart the heartbeat to update all waiting tabs once the UI becomes idle
if (!UI.isIdle()) {
this.startHeartbeat();
return;
}
let accumTime = 0;
let items = this._tabsWaitingForUpdate.getItems();
// Do as many updates as we can fit into a "perceived" amount
// of time, which is tunable.
while (accumTime < this._maxTimeForUpdating && items.length) {
let updateBegin = Date.now();
this._update(items.pop());
let updateEnd = Date.now();
// Maintain a simple average of time for each tabitem update
// We can use this as a base by which to delay things like
// tab zooming, so there aren't any hitches.
let deltaTime = updateEnd - updateBegin;
accumTime += deltaTime;
}
if (this._tabsWaitingForUpdate.hasItems())
this.startHeartbeat();
},
// ----------
// Function: pausePainting
// Tells TabItems to stop updating thumbnails (so you can do
// animations without thumbnail paints causing stutters).
// pausePainting can be called multiple times, but every call to
// pausePainting needs to be mirrored with a call to <resumePainting>.
pausePainting: function TabItems_pausePainting() {
this.paintingPaused++;
if (this._heartbeat) {
clearTimeout(this._heartbeat);
this._heartbeat = null;
}
},
// ----------
// Function: resumePainting
// Undoes a call to <pausePainting>. For instance, if you called
// pausePainting three times in a row, you'll need to call resumePainting
// three times before TabItems will start updating thumbnails again.
resumePainting: function TabItems_resumePainting() {
this.paintingPaused--;
Utils.assert(this.paintingPaused > -1, "paintingPaused should not go below zero");
if (!this.isPaintingPaused())
this.startHeartbeat();
},
// ----------
// Function: isPaintingPaused
// Returns a boolean indicating whether painting
// is paused or not.
isPaintingPaused: function TabItems_isPaintingPaused() {
return this.paintingPaused > 0;
},
// ----------
// Function: pauseReconnecting
// Don't reconnect any new tabs until resume is called.
pauseReconnecting: function TabItems_pauseReconnecting() {
Utils.assertThrow(!this._reconnectingPaused, "shouldn't already be paused");
this._reconnectingPaused = true;
},
// ----------
// Function: resumeReconnecting
// Reconnect all of the tabs that were created since we paused.
resumeReconnecting: function TabItems_resumeReconnecting() {
Utils.assertThrow(this._reconnectingPaused, "should already be paused");
this._reconnectingPaused = false;
this.items.forEach(function(item) {
if (!item._reconnected)
item._reconnect();
});
},
// ----------
// Function: reconnectingPaused
// Returns true if reconnecting is paused.
reconnectingPaused: function TabItems_reconnectingPaused() {
return this._reconnectingPaused;
},
// ----------
// Function: register
// Adds the given <TabItem> to the master list.
register: function TabItems_register(item) {
Utils.assert(item && item.isAnItem, 'item must be a TabItem');
Utils.assert(this.items.indexOf(item) == -1, 'only register once per item');
this.items.push(item);
},
// ----------
// Function: unregister
// Removes the given <TabItem> from the master list.
unregister: function TabItems_unregister(item) {
var index = this.items.indexOf(item);
if (index != -1)
this.items.splice(index, 1);
},
// ----------
// Function: getItems
// Returns a copy of the master array of <TabItem>s.
getItems: function TabItems_getItems() {
return Utils.copy(this.items);
},
// ----------
// Function: saveAll
// Saves all open <TabItem>s.
saveAll: function TabItems_saveAll() {
let tabItems = this.getItems();
tabItems.forEach(function TabItems_saveAll_forEach(tabItem) {
tabItem.save();
});
},
// ----------
// Function: storageSanity
// Checks the specified data (as returned by TabItem.getStorageData or loaded from storage)
// and returns true if it looks valid.
// TODO: this is a stub, please implement
storageSanity: function TabItems_storageSanity(data) {
return true;
},
// ----------
// Function: getFontSizeFromWidth
// Private method that returns the fontsize to use given the tab's width
getFontSizeFromWidth: function TabItem_getFontSizeFromWidth(width) {
let widthRange = new Range(0, TabItems.tabWidth);
let proportion = widthRange.proportion(width - TabItems.tabItemPadding.x, true);
// proportion is in [0,1]
return TabItems.fontSizeRange.scale(proportion);
},
// ----------
// Function: _getWidthForHeight
// Private method that returns the tabitem width given a height.
_getWidthForHeight: function TabItems__getWidthForHeight(height) {
return height * TabItems.invTabAspect;
},
// ----------
// Function: _getHeightForWidth
// Private method that returns the tabitem height given a width.
_getHeightForWidth: function TabItems__getHeightForWidth(width) {
return width * TabItems.tabAspect;
},
// ----------
// Function: calcValidSize
// Pass in a desired size, and receive a size based on proper title
// size and aspect ratio.
calcValidSize: function TabItems_calcValidSize(size, options) {
Utils.assert(Utils.isPoint(size), 'input is a Point');
let width = Math.max(TabItems.minTabWidth, size.x);
let showTitle = !options || !options.hideTitle;
let titleSize = showTitle ? TabItems.fontSizeRange.max : 0;
let height = Math.max(TabItems.minTabHeight, size.y - titleSize);
let retSize = new Point(width, height);
if (size.x > -1)
retSize.y = this._getHeightForWidth(width);
if (size.y > -1)
retSize.x = this._getWidthForHeight(height);
if (size.x > -1 && size.y > -1) {
if (retSize.x < size.x)
retSize.y = this._getHeightForWidth(retSize.x);
else
retSize.x = this._getWidthForHeight(retSize.y);
}
if (showTitle)
retSize.y += titleSize;
return retSize;
}
};
// ##########
// Class: TabPriorityQueue
// Container that returns tab items in a priority order
// Current implementation assigns tab to either a high priority
// or low priority queue, and toggles which queue items are popped
// from. This guarantees that high priority items which are constantly
// being added will not eclipse changes for lower priority items.
function TabPriorityQueue() {
};
TabPriorityQueue.prototype = {
_low: [], // low priority queue
_high: [], // high priority queue
// ----------
// Function: toString
// Prints [TabPriorityQueue count=count] for debug use
toString: function TabPriorityQueue_toString() {
return "[TabPriorityQueue count=" + (this._low.length + this._high.length) + "]";
},
// ----------
// Function: clear
// Empty the update queue
clear: function TabPriorityQueue_clear() {
this._low = [];
this._high = [];
},
// ----------
// Function: hasItems
// Return whether pending items exist
hasItems: function TabPriorityQueue_hasItems() {
return (this._low.length > 0) || (this._high.length > 0);
},
// ----------
// Function: getItems
// Returns all queued items, ordered from low to high priority
getItems: function TabPriorityQueue_getItems() {
return this._low.concat(this._high);
},
// ----------
// Function: push
// Add an item to be prioritized
push: function TabPriorityQueue_push(tab) {
// Push onto correct priority queue.
// It's only low priority if it's in a stack, and isn't the top,
// and the stack isn't expanded.
// If it already exists in the destination queue,
// leave it. If it exists in a different queue, remove it first and push
// onto new queue.
let item = tab._tabViewTabItem;
if (item.parent && (item.parent.isStacked() &&
!item.parent.isTopOfStack(item) &&
!item.parent.expanded)) {
let idx = this._high.indexOf(tab);
if (idx != -1) {
this._high.splice(idx, 1);
this._low.unshift(tab);
} else if (this._low.indexOf(tab) == -1)
this._low.unshift(tab);
} else {
let idx = this._low.indexOf(tab);
if (idx != -1) {
this._low.splice(idx, 1);
this._high.unshift(tab);
} else if (this._high.indexOf(tab) == -1)
this._high.unshift(tab);
}
},
// ----------
// Function: pop
// Remove and return the next item in priority order
pop: function TabPriorityQueue_pop() {
let ret = null;
if (this._high.length)
ret = this._high.pop();
else if (this._low.length)
ret = this._low.pop();
return ret;
},
// ----------
// Function: peek
// Return the next item in priority order, without removing it
peek: function TabPriorityQueue_peek() {
let ret = null;
if (this._high.length)
ret = this._high[this._high.length-1];
else if (this._low.length)
ret = this._low[this._low.length-1];
return ret;
},
// ----------
// Function: remove
// Remove the passed item
remove: function TabPriorityQueue_remove(tab) {
let index = this._high.indexOf(tab);
if (index != -1)
this._high.splice(index, 1);
else {
index = this._low.indexOf(tab);
if (index != -1)
this._low.splice(index, 1);
}
}
};
// ##########
// Class: TabCanvas
// Takes care of the actual canvas for the tab thumbnail
// Does not need to be accessed from outside of tabitems.js
function TabCanvas(tab, canvas) {
this.tab = tab;
this.canvas = canvas;
};
TabCanvas.prototype = Utils.extend(new Subscribable(), {
// ----------
// Function: toString
// Prints [TabCanvas (tab)] for debug use
toString: function TabCanvas_toString() {
return "[TabCanvas (" + this.tab + ")]";
},
// ----------
// Function: paint
paint: function TabCanvas_paint(evt) {
var w = this.canvas.width;
var h = this.canvas.height;
if (!w || !h)
return;
gPageThumbnails.captureToCanvas(this.tab.linkedBrowser, this.canvas, () => {
this._sendToSubscribers("painted");
});
},
// ----------
// Function: toImageData
toImageData: function TabCanvas_toImageData() {
return this.canvas.toDataURL("image/png");
}
});
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