source: Dev/trunk/src/client/dojox/image/Gallery.js

dojo.provide("dojox.image.Gallery");
dojo.experimental("dojox.image.Gallery");
//
// dojox.image.Gallery courtesy Shane O Sullivan, licensed under a Dojo CLA
//
// For a sample usage, see http://www.skynet.ie/~sos/photos.php
//
//      TODO: Make public, document params and privitize non-API conformant methods.
//      document topics.

dojo.require("dojo.fx");
dojo.require("dijit._Widget");
dojo.require("dijit._Templated");
dojo.require("dojox.image.ThumbnailPicker");
dojo.require("dojox.image.SlideShow");

dojo.declare("dojox.image.Gallery",
        [dijit._Widget, dijit._Templated],
        {
        // summary:
        //              Gallery widget that wraps a dojox.image.ThumbnailPicker and dojox.image.SlideShow widget
        //
        // imageHeight: Number
        //              Maximum height of an image in the SlideShow widget
        imageHeight: 375,
        
        // imageWidth: Number
        //              Maximum width of an image in the SlideShow widget
        imageWidth: 500,
                
        // pageSize: Number
        //              The number of records to retrieve from the data store per request.
        pageSize: dojox.image.SlideShow.prototype.pageSize,
        
        // autoLoad: Boolean
        //              If true, images are loaded before the user views them. If false, an
        //              image is loaded when the user displays it.
        autoLoad: true,
        
        // linkAttr: String
        //              Defines the name of the attribute to request from the store to retrieve the
        //              URL to link to from an image, if any.
        linkAttr: "link",
        
        // imageThumbAttr: String
        //              Defines the name of the attribute to request from the store to retrieve the
        //              URL to the thumbnail image.
        imageThumbAttr: "imageUrlThumb",
        
        // imageLargeAttr: String
        //              Defines the name of the attribute to request from the store to retrieve the
        //              URL to the image.
        imageLargeAttr: "imageUrl",
        
        // titleAttr: String
        //              Defines the name of the attribute to request from the store to retrieve the
        //              title of the picture, if any.
        titleAttr: "title",
 
        // slideshowInterval: Integer
        //              Time, in seconds, between image changes in the slide show.
        slideshowInterval: 3,
        
        templateString: dojo.cache("dojox.image", "resources/Gallery.html"),

        postCreate: function(){
                // summary:
                //              Initializes the widget, creates the ThumbnailPicker and SlideShow widgets
                this.widgetid = this.id;
                this.inherited(arguments)
                
                this.thumbPicker = new dojox.image.ThumbnailPicker({
                        linkAttr: this.linkAttr,
                        imageLargeAttr: this.imageLargeAttr,
                        imageThumbAttr: this.imageThumbAttr,
                        titleAttr: this.titleAttr,
                        useLoadNotifier: true,
                        size: this.imageWidth
                }, this.thumbPickerNode);
                
                
                this.slideShow = new dojox.image.SlideShow({
                        imageHeight: this.imageHeight,
                        imageWidth: this.imageWidth,
                        autoLoad: this.autoLoad,
                        linkAttr: this.linkAttr,
                        imageLargeAttr: this.imageLargeAttr,
                        titleAttr: this.titleAttr,
                        slideshowInterval: this.slideshowInterval,
                        pageSize: this.pageSize
                }, this.slideShowNode);
                
                var _this = this;
                //When an image is shown in the Slideshow, make sure it is visible
                //in the ThumbnailPicker
                dojo.subscribe(this.slideShow.getShowTopicName(), function(packet){
                        _this.thumbPicker._showThumbs(packet.index);
                });
                //When the user clicks a thumbnail, show that image
                dojo.subscribe(this.thumbPicker.getClickTopicName(), function(evt){
                        _this.slideShow.showImage(evt.index);
                });
                //When the ThumbnailPicker moves to show a new set of pictures,
                //make the Slideshow start loading those pictures first.
                dojo.subscribe(this.thumbPicker.getShowTopicName(), function(evt){
                        _this.slideShow.moveImageLoadingPointer(evt.index);
                });
                //When an image finished loading in the slideshow, update the loading
                //notification in the ThumbnailPicker
                dojo.subscribe(this.slideShow.getLoadTopicName(), function(index){
                        _this.thumbPicker.markImageLoaded(index);
                });
                this._centerChildren();
        },
          
        setDataStore: function(dataStore, request, /*optional*/paramNames){
                // summary:
                //              Sets the data store and request objects to read data from.
                // dataStore:
                //              An implementation of the dojo/data/api/Read API. This accesses the image
                //              data.
                // request:
                //              An implementation of the dojo/data/api/Request API. This specifies the
                //              query and paging information to be used by the data store
                // paramNames:
                //              An object defining the names of the item attributes to fetch from the
                //              data store.  The four attributes allowed are 'linkAttr', 'imageLargeAttr',
                //              'imageThumbAttr' and 'titleAttr'
                this.thumbPicker.setDataStore(dataStore, request, paramNames);
                this.slideShow.setDataStore(dataStore, request, paramNames);
        },
  
        reset: function(){
                // summary:
                //              Resets the widget to its initial state
                this.slideShow.reset();
                this.thumbPicker.reset();
        },
  
        showNextImage: function(inTimer){
                // summary:
                //              Changes the image being displayed in the SlideShow to the next
                //              image in the data store
                // inTimer: Boolean
                //              If true, a slideshow is active, otherwise the slideshow is inactive.
                this.slideShow.showNextImage();
        },

        toggleSlideshow: function(){
                dojo.deprecated("dojox.widget.Gallery.toggleSlideshow is deprecated.  Use toggleSlideShow instead.", "", "2.0");
                this.toggleSlideShow();
        },

        toggleSlideShow: function(){
                // summary:
                //              Switches the slideshow mode on and off.
                this.slideShow.toggleSlideShow();
        },

        showImage: function(index, /*optional*/callback){
                // summary:
                //              Shows the image at index 'idx'.
                // idx: Number
                //              The position of the image in the data store to display
                // callback: Function
                //              Optional callback function to call when the image has finished displaying.
                this.slideShow.showImage(index, callback);
        },
        
        resize: function(dim){
                this.thumbPicker.resize(dim);
        },
        
        _centerChildren: function() {
                // summary:
                //              Ensures that the ThumbnailPicker and the SlideShow widgets
                //              are centered.
                var thumbSize = dojo.marginBox(this.thumbPicker.outerNode);
                var slideSize = dojo.marginBox(this.slideShow.outerNode);
                
                var diff = (thumbSize.w - slideSize.w) / 2;
                
                if(diff > 0) {
                        dojo.style(this.slideShow.outerNode, "marginLeft", diff + "px");
                } else if(diff < 0) {
                        dojo.style(this.thumbPicker.outerNode, "marginLeft", (diff * -1) + "px");
                }
        }
});