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// Copyright 2009 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview provides a reusable photo UI component that renders photos that
* contains metadata (such as captions, description, thumbnail/high resolution
* versions, etc).
*
* goog.ui.media.Photo is actually a {@link goog.ui.ControlRenderer},
* a stateless class - that could/should be used as a Singleton with the static
* method {@code goog.ui.media.Photo.getInstance} -, that knows how to render
* Photos. It is designed to be used with a {@link goog.ui.Control}, which will
* actually control the media renderer and provide the {@link goog.ui.Component}
* base. This design guarantees that all different types of medias will behave
* alike but will look different.
*
* goog.ui.media.Photo expects {@code goog.ui.media.MediaModel} on
* {@code goog.ui.Control.getModel} as data models.
*
* Example of usage:
*
* <pre>
* var photo = goog.ui.media.Photo.newControl(
* new goog.ui.media.MediaModel('http://hostname/file.jpg'));
* photo.render(goog.dom.getElement('parent'));
* </pre>
*
* Photo medias currently support the following states:
*
* <ul>
* <li> {@link goog.ui.Component.State.HOVER}: mouse cursor is over the photo.
* <li> {@link goog.ui.Component.State.SELECTED}: photo is being displayed.
* </ul>
*
* Which can be accessed by
*
* <pre>
* photo.setHighlighted(true);
* photo.setSelected(true);
* </pre>
*
*/
goog.provide('goog.ui.media.Photo');
goog.require('goog.dom.TagName');
goog.require('goog.ui.media.Media');
goog.require('goog.ui.media.MediaRenderer');
/**
* Subclasses a goog.ui.media.MediaRenderer to provide a Photo specific media
* renderer. Provides a base class for any other renderer that wants to display
* photos.
*
* This class is meant to be used as a singleton static stateless class, that
* takes {@code goog.ui.media.Media} instances and renders it.
*
* This design is patterned after
* http://go/closure_control_subclassing
*
* @constructor
* @extends {goog.ui.media.MediaRenderer}
* @final
*/
goog.ui.media.Photo = function() {
goog.ui.media.MediaRenderer.call(this);
};
goog.inherits(goog.ui.media.Photo, goog.ui.media.MediaRenderer);
goog.addSingletonGetter(goog.ui.media.Photo);
/**
* Default CSS class to be applied to the root element of components rendered
* by this renderer.
*
* @type {string}
*/
goog.ui.media.Photo.CSS_CLASS = goog.getCssName('goog-ui-media-photo');
/**
* A static convenient method to construct a goog.ui.media.Media control out of
* a photo {@code goog.ui.media.MediaModel}. It sets it as the data model
* goog.ui.media.Photo renderer uses, sets the states supported by the renderer,
* and returns a Control that binds everything together. This is what you
* should be using for constructing Photos, except if you need finer control
* over the configuration.
*
* @param {goog.ui.media.MediaModel} dataModel The photo data model.
* @return {!goog.ui.media.Media} A goog.ui.Control subclass with the photo
* renderer.
*/
goog.ui.media.Photo.newControl = function(dataModel) {
var control =
new goog.ui.media.Media(dataModel, goog.ui.media.Photo.getInstance());
return control;
};
/**
* Creates the initial DOM structure of a photo.
*
* @param {goog.ui.Control} c The media control.
* @return {!Element} A DOM structure that represents the control.
* @override
*/
goog.ui.media.Photo.prototype.createDom = function(c) {
var control = /** @type {goog.ui.media.Media} */ (c);
var div = goog.ui.media.Photo.superClass_.createDom.call(this, control);
var img = control.getDomHelper().createDom(goog.dom.TagName.IMG, {
src: control.getDataModel().getPlayer().getUrl(),
className: goog.getCssName(this.getCssClass(), 'image')
});
div.appendChild(img);
return div;
};
/**
* Returns the CSS class to be applied to the root element of components
* rendered using this renderer.
* @return {string} Renderer-specific CSS class.
* @override
*/
goog.ui.media.Photo.prototype.getCssClass = function() {
return goog.ui.media.Photo.CSS_CLASS;
};
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