dataview.js

一个struts和extjs得源码

        startIndex = startIndex || 0;
        endIndex = endIndex || ((endIndex === 0) ? 0 : (ns.length - 1));
        for(var i = startIndex; i <= endIndex; i++){
            ns[i].viewIndex = i;
        }
    },
    
    /**
     * Returns the store associated with this DataView.
     * @return {Ext.data.Store} The store
     */
    getStore : function(){
        return this.store;
    },

    /**
     * Changes the data store bound to this view and refreshes it.
     * @param {Store} store The store to bind to this view
     */
    setStore : function(store, initial){
        if(!initial && this.store){
            this.store.un("beforeload", this.onBeforeLoad, this);
            this.store.un("datachanged", this.refresh, this);
            this.store.un("add", this.onAdd, this);
            this.store.un("remove", this.onRemove, this);
            this.store.un("update", this.onUpdate, this);
            this.store.un("clear", this.refresh, this);
        }
        if(store){
            store = Ext.StoreMgr.lookup(store);
            store.on("beforeload", this.onBeforeLoad, this);
            store.on("datachanged", this.refresh, this);
            store.on("add", this.onAdd, this);
            store.on("remove", this.onRemove, this);
            store.on("update", this.onUpdate, this);
            store.on("clear", this.refresh, this);
        }
        this.store = store;
        if(store){
            this.refresh();
        }
    },

    /**
     * Returns the template node the passed child belongs to, or null if it doesn't belong to one.
     * @param {HTMLElement} node
     * @return {HTMLElement} The template node
     */
    findItemFromChild : function(node){
        return Ext.fly(node).findParent(this.itemSelector, this.el);
    },

    // private
    onClick : function(e){
        var item = e.getTarget(this.itemSelector, this.el);
        if(item){
            var index = this.indexOf(item);
            if(this.onItemClick(item, index, e) !== false){
                this.fireEvent("click", this, index, item, e);
            }
        }else{
            if(this.fireEvent("containerclick", this, e) !== false){
                this.clearSelections();
            }
        }
    },

    // private
    onContextMenu : function(e){
        var item = e.getTarget(this.itemSelector, this.el);
        if(item){
            this.fireEvent("contextmenu", this, this.indexOf(item), item, e);
        }
    },

    // private
    onDblClick : function(e){
        var item = e.getTarget(this.itemSelector, this.el);
        if(item){
            this.fireEvent("dblclick", this, this.indexOf(item), item, e);
        }
    },

    // private
    onMouseOver : function(e){
        var item = e.getTarget(this.itemSelector, this.el);
        if(item && item !== this.lastItem){
            this.lastItem = item;
            Ext.fly(item).addClass(this.overClass);
            this.fireEvent("mouseenter", this, this.indexOf(item), item, e);
        }
    },

    // private
    onMouseOut : function(e){
        if(this.lastItem){
            if(!e.within(this.lastItem, true, true)){
                Ext.fly(this.lastItem).removeClass(this.overClass);
                this.fireEvent("mouseleave", this, this.indexOf(this.lastItem), this.lastItem, e);
                delete this.lastItem;
            }
        }
    },

    // private
    onItemClick : function(item, index, e){
        if(this.fireEvent("beforeclick", this, index, item, e) === false){
            return false;
        }
        if(this.multiSelect){
            this.doMultiSelection(item, index, e);
            e.preventDefault();
        }else if(this.singleSelect){
            this.doSingleSelection(item, index, e);
            e.preventDefault();
        }
        return true;
    },

    // private
    doSingleSelection : function(item, index, e){
        if(e.ctrlKey && this.isSelected(index)){
            this.deselect(index);
        }else{
            this.select(index, false);
        }
    },

    // private
    doMultiSelection : function(item, index, e){
        if(e.shiftKey && this.last !== false){
            var last = this.last;
            this.selectRange(last, index, e.ctrlKey);
            this.last = last; // reset the last
        }else{
            if((e.ctrlKey||this.simpleSelect) && this.isSelected(index)){
                this.deselect(index);
            }else{
                this.select(index, e.ctrlKey || e.shiftKey || this.simpleSelect);
            }
        }
    },

    /**
     * Gets the number of selected nodes.
     * @return {Number} The node count
     */
    getSelectionCount : function(){
        return this.selected.getCount()
    },

    /**
     * Gets the currently selected nodes.
     * @return {Array} An array of HTMLElements
     */
    getSelectedNodes : function(){
        return this.selected.elements;
    },

    /**
     * Gets the indexes of the selected nodes.
     * @return {Array} An array of numeric indexes
     */
    getSelectedIndexes : function(){
        var indexes = [], s = this.selected.elements;
        for(var i = 0, len = s.length; i < len; i++){
            indexes.push(s[i].viewIndex);
        }
        return indexes;
    },

    /**
     * Gets an array of the selected records
     * @return {Array} An array of {@link Ext.data.Record} objects
     */
    getSelectedRecords : function(){
        var r = [], s = this.selected.elements;
        for(var i = 0, len = s.length; i < len; i++){
            r[r.length] = this.store.getAt(s[i].viewIndex);
        }
        return r;
    },

    /**
     * Gets an array of the records from an array of nodes
     * @param {Array} nodes The nodes to evaluate
     * @return {Array} records The {@link Ext.data.Record} objects
     */
    getRecords : function(nodes){
        var r = [], s = nodes;
        for(var i = 0, len = s.length; i < len; i++){
            r[r.length] = this.store.getAt(s[i].viewIndex);
        }
        return r;
    },

    /**
     * Gets a record from a node
     * @param {HTMLElement} node The node to evaluate
     * @return {Record} record The {@link Ext.data.Record} object
     */
    getRecord : function(node){
        return this.store.getAt(node.viewIndex);
    },

    /**
     * Clears all selections.
     * @param {Boolean} suppressEvent (optional) True to skip firing of the selectionchange event
     */
    clearSelections : function(suppressEvent, skipUpdate){
        if((this.multiSelect || this.singleSelect) && this.selected.getCount() > 0){
            if(!skipUpdate){
                this.selected.removeClass(this.selectedClass);
            }
            this.selected.clear();
            this.last = false;
            if(!suppressEvent){
                this.fireEvent("selectionchange", this, this.selected.elements);
            }
        }
    },

    /**
     * Returns true if the passed node is selected, else false.
     * @param {HTMLElement/Number} node The node or node index to check
     * @return {Boolean} True if selected, else false
     */
    isSelected : function(node){
        return this.selected.contains(this.getNode(node));
    },

    /**
     * Deselects a node.
     * @param {HTMLElement/Number} node The node to deselect
     */
    deselect : function(node){
        if(this.isSelected(node)){
            node = this.getNode(node);
            this.selected.removeElement(node);
            if(this.last == node.viewIndex){
                this.last = false;
            }
            Ext.fly(node).removeClass(this.selectedClass);
            this.fireEvent("selectionchange", this, this.selected.elements);
        }
    },

    /**
     * Selects a set of nodes.
     * @param {Array/HTMLElement/String/Number} nodeInfo An HTMLElement template node, index of a template node,
     * id of a template node or an array of any of those to select
     * @param {Boolean} keepExisting (optional) true to keep existing selections
     * @param {Boolean} suppressEvent (optional) true to skip firing of the selectionchange vent
     */
    select : function(nodeInfo, keepExisting, suppressEvent){
        if(Ext.isArray(nodeInfo)){
            if(!keepExisting){
                this.clearSelections(true);
            }
            for(var i = 0, len = nodeInfo.length; i < len; i++){
                this.select(nodeInfo[i], true, true);
            }
	        if(!suppressEvent){
	            this.fireEvent("selectionchange", this, this.selected.elements);
	        }
        } else{
            var node = this.getNode(nodeInfo);
            if(!keepExisting){
                this.clearSelections(true);
            }
            if(node && !this.isSelected(node)){
                if(this.fireEvent("beforeselect", this, node, this.selected.elements) !== false){
                    Ext.fly(node).addClass(this.selectedClass);
                    this.selected.add(node);
                    this.last = node.viewIndex;
                    if(!suppressEvent){
                        this.fireEvent("selectionchange", this, this.selected.elements);
                    }
                }
            }
        }
    },

    /**
     * Selects a range of nodes. All nodes between start and end are selected.
     * @param {Number} start The index of the first node in the range
     * @param {Number} end The index of the last node in the range
     * @param {Boolean} keepExisting (optional) True to retain existing selections
     */
    selectRange : function(start, end, keepExisting){
        if(!keepExisting){
            this.clearSelections(true);
        }
        this.select(this.getNodes(start, end), true);
    },

    /**
     * Gets a template node.
     * @param {HTMLElement/String/Number} nodeInfo An HTMLElement template node, index of a template node or the id of a template node
     * @return {HTMLElement} The node or null if it wasn't found
     */
    getNode : function(nodeInfo){
        if(typeof nodeInfo == "string"){
            return document.getElementById(nodeInfo);
        }else if(typeof nodeInfo == "number"){
            return this.all.elements[nodeInfo];
        }
        return nodeInfo;
    },

    /**
     * Gets a range nodes.
     * @param {Number} start (optional) The index of the first node in the range
     * @param {Number} end (optional) The index of the last node in the range
     * @return {Array} An array of nodes
     */
    getNodes : function(start, end){
        var ns = this.all.elements;
        start = start || 0;
        end = typeof end == "undefined" ? Math.max(ns.length - 1, 0) : end;
        var nodes = [], i;
        if(start <= end){
            for(i = start; i <= end && ns[i]; i++){
                nodes.push(ns[i]);
            }
        } else{
            for(i = start; i >= end && ns[i]; i--){
                nodes.push(ns[i]);
            }
        }
        return nodes;
    },

    /**
     * Finds the index of the passed node.
     * @param {HTMLElement/String/Number} nodeInfo An HTMLElement template node, index of a template node or the id of a template node
     * @return {Number} The index of the node or -1
     */
    indexOf : function(node){
        node = this.getNode(node);
        if(typeof node.viewIndex == "number"){
            return node.viewIndex;
        }
        return this.all.indexOf(node);
    },

    // private
    onBeforeLoad : function(){
        if(this.loadingText){
            this.clearSelections(false, true);
            this.el.update('<div class="loading-indicator">'+this.loadingText+'</div>');
            this.all.clear();
        }
    },

    onDestroy : function(){
        Ext.DataView.superclass.onDestroy.call(this);
        this.setStore(null);
    }
});

Ext.reg('dataview', Ext.DataView);