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Diffstat (limited to 'components/downloads/content/indicator.js')
| -rw-r--r-- | components/downloads/content/indicator.js | 609 |
1 files changed, 609 insertions, 0 deletions
diff --git a/components/downloads/content/indicator.js b/components/downloads/content/indicator.js new file mode 100644 index 0000000..1a2175a --- /dev/null +++ b/components/downloads/content/indicator.js @@ -0,0 +1,609 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=2 et sw=2 tw=80: */ +/* 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/. */ + +/** + * Handles the indicator that displays the progress of ongoing downloads, which + * is also used as the anchor for the downloads panel. + * + * This module includes the following constructors and global objects: + * + * DownloadsButton + * Main entry point for the downloads indicator. Depending on how the toolbars + * have been customized, this object determines if we should show a fully + * functional indicator, a placeholder used during customization and in the + * customization palette, or a neutral view as a temporary anchor for the + * downloads panel. + * + * DownloadsIndicatorView + * Builds and updates the actual downloads status widget, responding to changes + * in the global status data, or provides a neutral view if the indicator is + * removed from the toolbars and only used as a temporary anchor. In addition, + * handles the user interaction events raised by the widget. + */ + +"use strict"; + +//////////////////////////////////////////////////////////////////////////////// +//// DownloadsButton + +/** + * Main entry point for the downloads indicator. Depending on how the toolbars + * have been customized, this object determines if we should show a fully + * functional indicator, a placeholder used during customization and in the + * customization palette, or a neutral view as a temporary anchor for the + * downloads panel. + */ +const DownloadsButton = { + /** + * Location of the indicator overlay. + */ + get kIndicatorOverlay() + "chrome://browser/content/downloads/indicatorOverlay.xul", + + /** + * Returns a reference to the downloads button position placeholder, or null + * if not available because it has been removed from the toolbars. + */ + get _placeholder() + { + return document.getElementById("downloads-button"); + }, + + /** + * This function is called asynchronously just after window initialization. + * + * NOTE: This function should limit the input/output it performs to improve + * startup time, and in particular should not cause the Download Manager + * service to start. + */ + initializeIndicator: function DB_initializeIndicator() + { + this._update(); + }, + + /** + * Indicates whether toolbar customization is in progress. + */ + _customizing: false, + + /** + * This function is called when toolbar customization starts. + * + * During customization, we never show the actual download progress indication + * or the event notifications, but we show a neutral placeholder. The neutral + * placeholder is an ordinary button defined in the browser window that can be + * moved freely between the toolbars and the customization palette. + */ + customizeStart: function DB_customizeStart() + { + // Hide the indicator and prevent it to be displayed as a temporary anchor + // during customization, even if requested using the getAnchor method. + this._customizing = true; + this._anchorRequested = false; + + let indicator = DownloadsIndicatorView.indicator; + if (indicator) { + indicator.collapsed = true; + } + + let placeholder = this._placeholder; + if (placeholder) { + placeholder.collapsed = false; + } + }, + + /** + * This function is called when toolbar customization ends. + */ + customizeDone: function DB_customizeDone() + { + this._customizing = false; + this._update(); + }, + + /** + * This function is called during initialization or when toolbar customization + * ends. It determines if we should enable or disable the object that keeps + * the indicator updated, and ensures that the placeholder is hidden unless it + * has been moved to the customization palette. + * + * NOTE: This function is also called on startup, thus it should limit the + * input/output it performs, and in particular should not cause the + * Download Manager service to start. + */ + _update: function DB_update() { + this._updatePositionInternal(); + + if (!DownloadsCommon.useToolkitUI) { + DownloadsIndicatorView.ensureInitialized(); + } else { + DownloadsIndicatorView.ensureTerminated(); + } + }, + + /** + * Determines the position where the indicator should appear, and moves its + * associated element to the new position. This does not happen if the + * indicator is currently being used as the anchor for the panel, to ensure + * that the panel doesn't flicker because we move the DOM element to which + * it's anchored. + */ + updatePosition: function DB_updatePosition() + { + if (!this._anchorRequested) { + this._updatePositionInternal(); + } + }, + + /** + * Determines the position where the indicator should appear, and moves its + * associated element to the new position. + * + * @return Anchor element, or null if the indicator is not visible. + */ + _updatePositionInternal: function DB_updatePositionInternal() + { + let indicator = DownloadsIndicatorView.indicator; + if (!indicator) { + // Exit now if the indicator overlay isn't loaded yet. + return null; + } + + let placeholder = this._placeholder; + if (!placeholder) { + // The placeholder has been removed from the browser window. + indicator.collapsed = true; + // Move the indicator to a safe position on the toolbar, since otherwise + // it may break the merge of adjacent items, like back/forward + urlbar. + indicator.parentNode.appendChild(indicator); + return null; + } + + // Position the indicator where the placeholder is located. We should + // update the position even if the placeholder is located on an invisible + // toolbar, because the toolbar may be displayed later. + placeholder.parentNode.insertBefore(indicator, placeholder); + placeholder.collapsed = true; + indicator.collapsed = false; + + indicator.open = this._anchorRequested; + + // Determine if the placeholder is located on an invisible toolbar. + if (!isElementVisible(placeholder.parentNode)) { + return null; + } + + return DownloadsIndicatorView.indicatorAnchor; + }, + + /** + * Checks whether the indicator is, or will soon be visible in the browser + * window. + * + * @param aCallback + * Called once the indicator overlay has loaded. Gets a boolean + * argument representing the indicator visibility. + */ + checkIsVisible: function DB_checkIsVisible(aCallback) + { + function DB_CEV_callback() { + if (!this._placeholder) { + aCallback(false); + } else { + let element = DownloadsIndicatorView.indicator || this._placeholder; + aCallback(isElementVisible(element.parentNode)); + } + } + DownloadsOverlayLoader.ensureOverlayLoaded(this.kIndicatorOverlay, + DB_CEV_callback.bind(this)); + }, + + /** + * Indicates whether we should try and show the indicator temporarily as an + * anchor for the panel, even if the indicator would be hidden by default. + */ + _anchorRequested: false, + + /** + * Ensures that there is an anchor available for the panel. + * + * @param aCallback + * Called when the anchor is available, passing the element where the + * panel should be anchored, or null if an anchor is not available (for + * example because both the tab bar and the navigation bar are hidden). + */ + getAnchor: function DB_getAnchor(aCallback) + { + // Do not allow anchoring the panel to the element while customizing. + if (this._customizing) { + aCallback(null); + return; + } + + function DB_GA_callback() { + this._anchorRequested = true; + aCallback(this._updatePositionInternal()); + } + + DownloadsOverlayLoader.ensureOverlayLoaded(this.kIndicatorOverlay, + DB_GA_callback.bind(this)); + }, + + /** + * Allows the temporary anchor to be hidden. + */ + releaseAnchor: function DB_releaseAnchor() + { + this._anchorRequested = false; + this._updatePositionInternal(); + }, + + get _tabsToolbar() + { + delete this._tabsToolbar; + return this._tabsToolbar = document.getElementById("TabsToolbar"); + }, + + get _navBar() + { + delete this._navBar; + return this._navBar = document.getElementById("nav-bar"); + } +}; + +Object.defineProperty(this, "DownloadsButton", { + value: DownloadsButton, + enumerable: true, + writable: false +}); + +//////////////////////////////////////////////////////////////////////////////// +//// DownloadsIndicatorView + +/** + * Builds and updates the actual downloads status widget, responding to changes + * in the global status data, or provides a neutral view if the indicator is + * removed from the toolbars and only used as a temporary anchor. In addition, + * handles the user interaction events raised by the widget. + */ +const DownloadsIndicatorView = { + /** + * True when the view is connected with the underlying downloads data. + */ + _initialized: false, + + /** + * True when the user interface elements required to display the indicator + * have finished loading in the browser window, and can be referenced. + */ + _operational: false, + + /** + * Prepares the downloads indicator to be displayed. + */ + ensureInitialized: function DIV_ensureInitialized() + { + if (this._initialized) { + return; + } + this._initialized = true; + + window.addEventListener("unload", this.onWindowUnload, false); + DownloadsCommon.getIndicatorData(window).addView(this); + }, + + /** + * Frees the internal resources related to the indicator. + */ + ensureTerminated: function DIV_ensureTerminated() + { + if (!this._initialized) { + return; + } + this._initialized = false; + + window.removeEventListener("unload", this.onWindowUnload, false); + DownloadsCommon.getIndicatorData(window).removeView(this); + + // Reset the view properties, so that a neutral indicator is displayed if we + // are visible only temporarily as an anchor. + this.counter = ""; + this.percentComplete = 0; + this.paused = false; + this.attention = false; + }, + + /** + * Ensures that the user interface elements required to display the indicator + * are loaded, then invokes the given callback. + */ + _ensureOperational: function DIV_ensureOperational(aCallback) + { + if (this._operational) { + aCallback(); + return; + } + + function DIV_EO_callback() { + this._operational = true; + + // If the view is initialized, we need to update the elements now that + // they are finally available in the document. + if (this._initialized) { + DownloadsCommon.getIndicatorData(window).refreshView(this); + } + + aCallback(); + } + + DownloadsOverlayLoader.ensureOverlayLoaded( + DownloadsButton.kIndicatorOverlay, + DIV_EO_callback.bind(this)); + }, + + ////////////////////////////////////////////////////////////////////////////// + //// Direct control functions + + /** + * Set while we are waiting for a notification to fade out. + */ + _notificationTimeout: null, + + /** + * If the status indicator is visible in its assigned position, shows for a + * brief time a visual notification of a relevant event, like a new download. + * + * @param aType + * Set to "start" for new downloads, "finish" for completed downloads. + */ + showEventNotification: function DIV_showEventNotification(aType) + { + if (!this._initialized) { + return; + } + + if (!DownloadsCommon.animateNotifications) { + return; + } + + // No need to show visual notification if the panel is visible. + if (DownloadsPanel.isPanelShowing) { + return; + } + + function DIV_SEN_callback() { + if (this._notificationTimeout) { + clearTimeout(this._notificationTimeout); + } + + // Now that the overlay is loaded, place the indicator in its final + // position. + DownloadsButton.updatePosition(); + + let indicator = this.indicator; + indicator.setAttribute("notification", aType); + this._notificationTimeout = setTimeout( + function () indicator.removeAttribute("notification"), 1000); + } + + this._ensureOperational(DIV_SEN_callback.bind(this)); + }, + + ////////////////////////////////////////////////////////////////////////////// + //// Callback functions from DownloadsIndicatorData + + /** + * Indicates whether the indicator should be shown because there are some + * downloads to be displayed. + */ + set hasDownloads(aValue) + { + if (this._hasDownloads != aValue) { + this._hasDownloads = aValue; + + // If there is at least one download, ensure that the view elements are + // loaded before determining the position of the downloads button. + if (aValue) { + this._ensureOperational(function() DownloadsButton.updatePosition()); + } else { + DownloadsButton.updatePosition(); + } + } + return aValue; + }, + get hasDownloads() + { + return this._hasDownloads; + }, + _hasDownloads: false, + + /** + * Status text displayed in the indicator. If this is set to an empty value, + * then the small downloads icon is displayed instead of the text. + */ + set counter(aValue) + { + if (!this._operational) { + return this._counter; + } + + if (this._counter !== aValue) { + this._counter = aValue; + if (this._counter) + this.indicator.setAttribute("counter", "true"); + else + this.indicator.removeAttribute("counter"); + // We have to set the attribute instead of using the property because the + // XBL binding isn't applied if the element is invisible for any reason. + this._indicatorCounter.setAttribute("value", aValue); + } + return aValue; + }, + _counter: null, + + /** + * Progress indication to display, from 0 to 100, or -1 if unknown. The + * progress bar is hidden if the current progress is unknown and no status + * text is set in the "counter" property. + */ + set percentComplete(aValue) + { + if (!this._operational) { + return this._percentComplete; + } + + if (this._percentComplete !== aValue) { + this._percentComplete = aValue; + if (this._percentComplete >= 0) + this.indicator.setAttribute("progress", "true"); + else + this.indicator.removeAttribute("progress"); + // We have to set the attribute instead of using the property because the + // XBL binding isn't applied if the element is invisible for any reason. + this._indicatorProgress.setAttribute("value", Math.max(aValue, 0)); + } + return aValue; + }, + _percentComplete: null, + + /** + * Indicates whether the progress won't advance because of a paused state. + * Setting this property forces a paused progress bar to be displayed, even if + * the current progress information is unavailable. + */ + set paused(aValue) + { + if (!this._operational) { + return this._paused; + } + + if (this._paused != aValue) { + this._paused = aValue; + if (this._paused) { + this.indicator.setAttribute("paused", "true") + } else { + this.indicator.removeAttribute("paused"); + } + } + return aValue; + }, + _paused: false, + + /** + * Set when the indicator should draw user attention to itself. + */ + set attention(aValue) + { + if (!this._operational) { + return this._attention; + } + + if (this._attention != aValue) { + this._attention = aValue; + if (aValue) { + this.indicator.setAttribute("attention", "true"); + } else { + this.indicator.removeAttribute("attention"); + } + } + return aValue; + }, + _attention: false, + + ////////////////////////////////////////////////////////////////////////////// + //// User interface event functions + + onWindowUnload: function DIV_onWindowUnload() + { + // This function is registered as an event listener, we can't use "this". + DownloadsIndicatorView.ensureTerminated(); + }, + + onCommand: function DIV_onCommand(aEvent) + { + if (DownloadsCommon.useToolkitUI) { + // The panel won't suppress attention for us, we need to clear now. + DownloadsCommon.getIndicatorData(window).attention = false; + BrowserDownloadsUI(); + } else { + DownloadsPanel.showPanel(); + } + + aEvent.stopPropagation(); + }, + + onDragOver: function DIV_onDragOver(aEvent) + { + browserDragAndDrop.dragOver(aEvent); + }, + + onDrop: function DIV_onDrop(aEvent) + { + let dt = aEvent.dataTransfer; + // If dragged item is from our source, do not try to + // redownload already downloaded file. + if (dt.mozGetDataAt("application/x-moz-file", 0)) + return; + + let links = browserDragAndDrop.dropLinks(aEvent); + if (!links.length) + return; + let sourceDoc = dt.mozSourceNode ? dt.mozSourceNode.ownerDocument : document; + let handled = false; + for (let link of links) { + if (link.url.startsWith("about:")) + continue; + saveURL(link.url, link.name, null, true, true, null, sourceDoc); + handled = true; + } + if (handled) { + aEvent.preventDefault(); + } + }, + + /** + * Returns a reference to the main indicator element, or null if the element + * is not present in the browser window yet. + */ + get indicator() + { + let indicator = document.getElementById("downloads-indicator"); + if (!indicator) { + return null; + } + + // Once the element is loaded, it will never be unloaded. + delete this.indicator; + return this.indicator = indicator; + }, + + get indicatorAnchor() + { + delete this.indicatorAnchor; + return this.indicatorAnchor = + document.getElementById("downloads-indicator-anchor"); + }, + + get _indicatorCounter() + { + delete this._indicatorCounter; + return this._indicatorCounter = + document.getElementById("downloads-indicator-counter"); + }, + + get _indicatorProgress() + { + delete this._indicatorProgress; + return this._indicatorProgress = + document.getElementById("downloads-indicator-progress"); + } +}; + +Object.defineProperty(this, "DownloadsIndicatorView", { + value: DownloadsIndicatorView, + enumerable: true, + writable: false +}); |