322 lines
11 KiB
JavaScript
322 lines
11 KiB
JavaScript
// Copyright 2009 The Closure Library Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS-IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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* @fileoverview provides a reusable picasa album UI component given a public
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* picasa album URL.
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*
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* TODO(user): implement the javascript viewer, for users without flash. Get it
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* from the Gmail Picasa gadget.
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*
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* goog.ui.media.PicasaAlbum is actually a {@link goog.ui.ControlRenderer}, a
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* stateless class - that could/should be used as a Singleton with the static
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* method {@code goog.ui.media.PicasaAlbum.getInstance} -, that knows how to
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* render picasa albums. It is designed to be used with a
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* {@link goog.ui.Control}, which will actually control the media renderer and
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* provide the {@link goog.ui.Component} base. This design guarantees that all
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* different types of medias will behave alike but will look different.
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*
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* goog.ui.media.PicasaAlbum expects {@code goog.ui.media.PicasaAlbumModel}s on
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* {@code goog.ui.Control.getModel} as data models, and render a flash object
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* that will show a slideshow with the contents of that album URL.
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*
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* Example of usage:
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*
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* <pre>
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* var album = goog.ui.media.PicasaAlbumModel.newInstance(
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* 'http://picasaweb.google.com/username/SanFranciscoCalifornia');
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* goog.ui.media.PicasaAlbum.newControl(album).render();
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* </pre>
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*
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* picasa medias currently support the following states:
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*
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* <ul>
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* <li> {@link goog.ui.Component.State.DISABLED}: shows 'flash not available'
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* <li> {@link goog.ui.Component.State.HOVER}: mouse cursor is over the album
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* <li> {@link goog.ui.Component.State.SELECTED}: flash album is shown
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* </ul>
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*
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* Which can be accessed by
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*
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* <pre>
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* picasa.setEnabled(true);
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* picasa.setHighlighted(true);
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* picasa.setSelected(true);
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* </pre>
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*
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*
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* @supported IE6, FF2+, Safari. Requires flash to actually work.
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*
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* TODO(user): test on other browsers
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*/
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goog.provide('goog.ui.media.PicasaAlbum');
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goog.provide('goog.ui.media.PicasaAlbumModel');
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goog.require('goog.ui.media.FlashObject');
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goog.require('goog.ui.media.Media');
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goog.require('goog.ui.media.MediaModel');
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goog.require('goog.ui.media.MediaRenderer');
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/**
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* Subclasses a goog.ui.media.MediaRenderer to provide a Picasa specific media
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* renderer.
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*
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* This class knows how to parse picasa URLs, and render the DOM structure
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* of picasa album players and previews. This class is meant to be used as a
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* singleton static stateless class, that takes {@code goog.ui.media.Media}
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* instances and renders it. It expects {@code goog.ui.media.Media.getModel} to
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* return a well formed, previously constructed, object with a user and album
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* fields {@see goog.ui.media.PicasaAlbum.parseUrl}, which is the data model
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* this renderer will use to construct the DOM structure.
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* {@see goog.ui.media.PicasaAlbum.newControl} for a example of constructing a
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* control with this renderer.
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*
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* goog.ui.media.PicasaAlbum currently displays a picasa-made flash slideshow
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* with the photos, but could possibly display a handwritten js photo viewer,
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* in case flash is not available.
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*
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* This design is patterned after http://go/closure_control_subclassing
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*
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* It uses {@link goog.ui.media.FlashObject} to embed the flash object.
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*
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* @constructor
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* @extends {goog.ui.media.MediaRenderer}
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*/
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goog.ui.media.PicasaAlbum = function() {
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goog.ui.media.MediaRenderer.call(this);
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};
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goog.inherits(goog.ui.media.PicasaAlbum, goog.ui.media.MediaRenderer);
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goog.addSingletonGetter(goog.ui.media.PicasaAlbum);
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/**
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* Default CSS class to be applied to the root element of components rendered
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* by this renderer.
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*
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* @type {string}
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*/
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goog.ui.media.PicasaAlbum.CSS_CLASS = goog.getCssName('goog-ui-media-picasa');
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/**
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* A static convenient method to construct a goog.ui.media.Media control out of
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* a picasa data model. It sets it as the data model goog.ui.media.PicasaAlbum
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* renderer uses, sets the states supported by the renderer, and returns a
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* Control that binds everything together. This is what you should be using for
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* constructing Picasa albums, except if you need finer control over the
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* configuration.
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*
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* @param {goog.ui.media.PicasaAlbumModel} dataModel A picasa album data model.
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* @param {goog.dom.DomHelper=} opt_domHelper Optional DOM helper, used for
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* document interaction.
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* @return {goog.ui.media.Media} A Control instance binded to the Picasa
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* renderer.
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*/
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goog.ui.media.PicasaAlbum.newControl = function(dataModel, opt_domHelper) {
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var control = new goog.ui.media.Media(
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dataModel,
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goog.ui.media.PicasaAlbum.getInstance(),
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opt_domHelper);
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control.setSelected(true);
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return control;
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};
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/**
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* Creates the initial DOM structure of the picasa album, which is basically a
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* the flash object pointing to a flash picasa album player.
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*
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* @param {goog.ui.Control} c The media control.
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* @return {Element} The DOM structure that represents the control.
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* @override
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*/
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goog.ui.media.PicasaAlbum.prototype.createDom = function(c) {
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var control = /** @type {goog.ui.media.Media} */ (c);
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var div = goog.ui.media.PicasaAlbum.superClass_.createDom.call(this, control);
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var picasaAlbum =
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/** @type {goog.ui.media.PicasaAlbumModel} */ (control.getDataModel());
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var authParam =
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picasaAlbum.getAuthKey() ? ('&authkey=' + picasaAlbum.getAuthKey()) : '';
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var flash = new goog.ui.media.FlashObject(
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picasaAlbum.getPlayer().getUrl() || '',
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control.getDomHelper());
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flash.addFlashVars(picasaAlbum.getPlayer().getVars());
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flash.render(div);
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return div;
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};
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/**
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* Returns the CSS class to be applied to the root element of components
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* rendered using this renderer.
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* @return {string} Renderer-specific CSS class.
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* @override
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*/
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goog.ui.media.PicasaAlbum.prototype.getCssClass = function() {
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return goog.ui.media.PicasaAlbum.CSS_CLASS;
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};
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/**
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* The {@code goog.ui.media.PicasaAlbum} media data model. It stores a required
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* {@code userId} and {@code albumId} fields, sets the picasa album URL, and
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* allows a few optional parameters.
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*
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* @param {string} userId The picasa userId associated with this album.
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* @param {string} albumId The picasa albumId associated with this album.
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* @param {string=} opt_authKey An optional authentication key, used on private
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* albums.
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* @param {string=} opt_caption An optional caption of the picasa album.
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* @param {string=} opt_description An optional description of the picasa album.
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* @param {boolean=} opt_autoplay Whether to autoplay the slideshow.
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* @constructor
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* @extends {goog.ui.media.MediaModel}
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*/
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goog.ui.media.PicasaAlbumModel = function(userId,
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albumId,
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opt_authKey,
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opt_caption,
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opt_description,
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opt_autoplay) {
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goog.ui.media.MediaModel.call(
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this,
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goog.ui.media.PicasaAlbumModel.buildUrl(userId, albumId),
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opt_caption,
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opt_description,
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goog.ui.media.MediaModel.MimeType.FLASH);
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/**
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* The Picasa user id.
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* @type {string}
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* @private
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*/
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this.userId_ = userId;
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/**
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* The Picasa album id.
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* @type {string}
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* @private
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*/
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this.albumId_ = albumId;
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/**
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* The Picasa authentication key, used on private albums.
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* @type {?string}
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* @private
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*/
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this.authKey_ = opt_authKey || null;
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var authParam = opt_authKey ? ('&authkey=' + opt_authKey) : '';
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var flashVars = {
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'host': 'picasaweb.google.com',
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'RGB': '0x000000',
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'feed': 'http://picasaweb.google.com/data/feed/api/user/' +
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userId + '/album/' + albumId + '?kind=photo&alt=rss' + authParam
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};
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flashVars[opt_autoplay ? 'autoplay' : 'noautoplay'] = '1';
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var player = new goog.ui.media.MediaModel.Player(
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'http://picasaweb.google.com/s/c/bin/slideshow.swf', flashVars);
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this.setPlayer(player);
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};
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goog.inherits(goog.ui.media.PicasaAlbumModel, goog.ui.media.MediaModel);
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/**
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* Regular expression used to extract the picasa username and albumid out of
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* picasa URLs.
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*
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* Copied from http://go/markdownlite.js,
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* and {@link PicasaWebExtractor.xml}.
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*
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* @type {RegExp}
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* @private
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* @const
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*/
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goog.ui.media.PicasaAlbumModel.MATCHER_ =
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/https?:\/\/(?:www\.)?picasaweb\.(?:google\.)?com\/([\d\w\.]+)\/([\d\w_\-\.]+)(?:\?[\w\d\-_=&;\.]*&?authKey=([\w\d\-_=;\.]+))?(?:#([\d]+)?)?/im;
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/**
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* Gets a {@code picasaUrl} and extracts the user and album id.
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*
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* @param {string} picasaUrl A picasa album URL.
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* @param {string=} opt_caption An optional caption of the picasa album.
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* @param {string=} opt_description An optional description of the picasa album.
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* @param {boolean=} opt_autoplay Whether to autoplay the slideshow.
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* @return {goog.ui.media.PicasaAlbumModel} The picasa album data model that
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* represents the picasa URL.
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* @throws exception in case the parsing fails
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*/
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goog.ui.media.PicasaAlbumModel.newInstance = function(picasaUrl,
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opt_caption,
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opt_description,
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opt_autoplay) {
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if (goog.ui.media.PicasaAlbumModel.MATCHER_.test(picasaUrl)) {
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var data = goog.ui.media.PicasaAlbumModel.MATCHER_.exec(picasaUrl);
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return new goog.ui.media.PicasaAlbumModel(
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data[1], data[2], data[3], opt_caption, opt_description, opt_autoplay);
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}
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throw Error('failed to parse user and album from picasa url: ' + picasaUrl);
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};
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/**
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* The opposite of {@code newInstance}: takes an {@code userId} and an
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* {@code albumId} and builds a URL.
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*
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* @param {string} userId The user that owns the album.
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* @param {string} albumId The album id.
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* @return {string} The URL of the album.
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*/
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goog.ui.media.PicasaAlbumModel.buildUrl = function(userId, albumId) {
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return 'http://picasaweb.google.com/' + userId + '/' + albumId;
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};
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/**
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* Gets the Picasa user id.
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* @return {string} The Picasa user id.
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*/
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goog.ui.media.PicasaAlbumModel.prototype.getUserId = function() {
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return this.userId_;
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};
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/**
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* Gets the Picasa album id.
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* @return {string} The Picasa album id.
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*/
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goog.ui.media.PicasaAlbumModel.prototype.getAlbumId = function() {
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return this.albumId_;
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};
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/**
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* Gets the Picasa album authentication key.
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* @return {?string} The Picasa album authentication key.
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*/
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goog.ui.media.PicasaAlbumModel.prototype.getAuthKey = function() {
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return this.authKey_;
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};
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