Index: chrome/renderer/resources/extensions/downloads_custom_bindings.js |
diff --git a/chrome/renderer/resources/extensions/downloads_custom_bindings.js b/chrome/renderer/resources/extensions/downloads_custom_bindings.js |
new file mode 100644 |
index 0000000000000000000000000000000000000000..d0d3d4419824646906d2e106a060c4c136d127ea |
--- /dev/null |
+++ b/chrome/renderer/resources/extensions/downloads_custom_bindings.js |
@@ -0,0 +1,133 @@ |
+// Copyright (c) 2013 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+// Custom bindings for the downloads API. |
+ |
+var downloadsNatives = requireNative('downloads'); |
+var chromeHidden = requireNative('chrome_hidden').GetChromeHidden(); |
+var sendRequest = require('sendRequest').sendRequest; |
+ |
+function DownloadsEvent(eventName, |
+ opt_argSchemas, |
+ ignored_extraArgSchemas, |
+ opt_eventOptions) { |
+ if (typeof eventName != 'string') |
+ throw new Error('chrome.DownloadsEvent requires an event name.'); |
+ // onDeterminingFilename is the only special event in chrome.downloads. |
+ if (eventName != 'downloads.onDeterminingFilename') { |
+ return new chrome.Event(eventName, opt_argSchemas, opt_eventOptions); |
+ } |
+ |
+ this.eventName_ = eventName; |
+ // ExtensionDownloadsEventRouter can't send a SuggestFilenameCallback, so |
+ // slice it out of the event schema, leaving only the DownloadItem. |
+ this.argSchemas_ = opt_argSchemas.slice(0, 1); |
+ this.eventOptions_ = chromeHidden.parseEventOptions(opt_eventOptions); |
+ this.subEvents_ = []; |
+} |
+ |
+// Test if the given callback is registered for this event. |
+DownloadsEvent.prototype.hasListener = function(cb) { |
+ if (!this.eventOptions_.supportsListeners) |
+ throw new Error('This event does not support listeners.'); |
+ return this.findListener_(cb) > -1; |
+}; |
+ |
+// Test if any callbacks are registered for this event. |
+DownloadsEvent.prototype.hasListeners = function() { |
+ if (!this.eventOptions_.supportsListeners) |
+ throw new Error('This event does not support listeners.'); |
+ return (this.subEvents_.length > 0); |
+}; |
+ |
+DownloadsEvent.prototype.addListener = function(cb) { |
+ if (!this.eventOptions_.supportsListeners) |
+ throw new Error('This event does not support listeners.'); |
+ var entry = {callback: cb}; |
+ entry.determiner_id = downloadsNatives.GetFilenameDeterminerId(); |
+ entry.subEvent = new chrome.Event( |
+ this.eventName_ + '/' + entry.determiner_id, this.argSchemas_); |
+ entry.subEventCallback = function() { |
+ var downloadItem = arguments[0]; |
+ // Copy the id so that extensions can't change downloadItem.id. |
+ var downloadId = downloadItem.id; |
+ var suggestable = true; |
+ function suggest(result) { |
+ if (!suggestable) |
+ return; |
Matt Perry
2013/02/22 22:53:06
Also print an error (console.error) explaining how
|
+ suggestable = false; |
+ if ((typeof(result) == 'object') && |
+ result.filename && |
+ (typeof(result.filename) == 'string') && |
+ ((result.overwrite === undefined) || |
+ (typeof(result.overwrite) == 'boolean'))) { |
+ chromeHidden.internalAPIs.downloadsInternal.determineFilename( |
+ entry.determiner_id, |
+ downloadId, |
+ result.filename, |
+ result.overwrite || false); |
+ } else { |
+ chromeHidden.internalAPIs.downloadsInternal.determineFilename( |
+ entry.determiner_id, |
+ downloadId); |
+ } |
+ } |
+ try { |
+ if (cb.apply(null, [downloadItem, suggest]) !== true) |
+ suggest(); |
+ } catch (e) { |
+ suggest(); |
+ throw e; |
+ } |
+ }; |
+ this.subEvents_.push(entry); |
+ entry.subEvent.addListener(entry.subEventCallback); |
+}; |
+ |
+DownloadsEvent.prototype.removeListener = function(cb) { |
+ if (!this.eventOptions_.supportsListeners) |
+ throw new Error('This event does not support listeners.'); |
+ var idx; |
+ while ((idx = this.findListener_(cb)) >= 0) { |
+ var e = this.subEvents_[idx]; |
+ e.subEvent.removeListener(e.subEventCallback); |
+ if (e.subEvent.hasListeners()) { |
+ console.error('Internal error: subEvent has orphaned listeners.'); |
+ } |
+ this.subEvents_.splice(idx, 1); |
+ } |
+}; |
+ |
+DownloadsEvent.prototype.findListener_ = function(cb) { |
+ for (var i in this.subEvents_) { |
+ var e = this.subEvents_[i]; |
+ if (e.callback === cb) { |
+ if (e.subEvent.findListener_(e.subEventCallback) > -1) |
+ return i; |
+ console.error('Internal error: subEvent has no callback.'); |
+ } |
+ } |
+ |
+ return -1; |
+}; |
+ |
+DownloadsEvent.prototype.addRules = function(rules, opt_cb) { |
+ if (!this.eventOptions_.supportsRules) |
+ throw new Error('This event does not support rules.'); |
+ this.eventForRules_.addRules(rules, opt_cb); |
+} |
+ |
+DownloadsEvent.prototype.removeRules = function(ruleIdentifiers, opt_cb) { |
+ if (!this.eventOptions_.supportsRules) |
+ throw new Error('This event does not support rules.'); |
+ this.eventForRules_.removeRules(ruleIdentifiers, opt_cb); |
+} |
+ |
+DownloadsEvent.prototype.getRules = function(ruleIdentifiers, cb) { |
+ if (!this.eventOptions_.supportsRules) |
+ throw new Error('This event does not support rules.'); |
+ this.eventForRules_.getRules(ruleIdentifiers, cb); |
+} |
+ |
+chromeHidden.registerCustomEvent('downloads', DownloadsEvent); |