ddview.js

一个struts和extjs得源码

            this.dropZone.onNodeOut = this.onNodeOut.createDelegate(this);
            this.dropZone.onNodeDrop = this.onNodeDrop.createDelegate(this);
        }
    },

	// private
    getDropPoint : function(e, n, dd){
        if (n == this.el.dom) { return "above"; }
        var t = Ext.lib.Dom.getY(n), b = t + n.offsetHeight;
        var c = t + (b - t) / 2;
        var y = Ext.lib.Event.getPageY(e);
        if(y <= c) {
            return "above";
        }else{
            return "below";
        }
    },

    // private
    isValidDropPoint: function(pt, n, data) {
        if (!data.viewNodes || (data.viewNodes.length != 1)) {
            return true;
        }
        var d = data.viewNodes[0];
        if (d == n) {
            return false;
        }
        if ((pt == "below") && (n.nextSibling == d)) {
            return false;
        }
        if ((pt == "above") && (n.previousSibling == d)) {
            return false;
        }
        return true;
    },

    // private
    onNodeEnter : function(n, dd, e, data){
        if (this.highlightColor && (data.sourceView != this)) {
            this.el.highlight(this.highlightColor);
        }
        return false;
    },

    // private
    onNodeOver : function(n, dd, e, data){
        var dragElClass = this.dropNotAllowed;
        var pt = this.getDropPoint(e, n, dd);
        if (this.isValidDropPoint(pt, n, data)) {
            if (this.appendOnly || this.sortField) {
                return "x-tree-drop-ok-below";
            }

            // set the insert point style on the target node
            if (pt) {
                var targetElClass;
                if (pt == "above"){
                    dragElClass = n.previousSibling ? "x-tree-drop-ok-between" : "x-tree-drop-ok-above";
                    targetElClass = "x-view-drag-insert-above";
                } else {
                    dragElClass = n.nextSibling ? "x-tree-drop-ok-between" : "x-tree-drop-ok-below";
                    targetElClass = "x-view-drag-insert-below";
                }
                if (this.lastInsertClass != targetElClass){
                    Ext.fly(n).replaceClass(this.lastInsertClass, targetElClass);
                    this.lastInsertClass = targetElClass;
                }
            }
        }
        return dragElClass;
    },

    // private
    onNodeOut : function(n, dd, e, data){
        this.removeDropIndicators(n);
    },

    // private
    onNodeDrop : function(n, dd, e, data){
        if (this.fireEvent("drop", this, n, dd, e, data) === false) {
            return false;
        }
        var pt = this.getDropPoint(e, n, dd);
        var insertAt = (this.appendOnly || (n == this.el.dom)) ? this.store.getCount() : n.viewIndex;
        if (pt == "below") {
            insertAt++;
        }

        // Validate if dragging within a DDView
        if (data.sourceView == this) {
            // If the first element to be inserted below is the target node, remove it
            if (pt == "below") {
                if (data.viewNodes[0] == n) {
                    data.viewNodes.shift();
                }
            } else {  // If the last element to be inserted above is the target node, remove it
                if (data.viewNodes[data.viewNodes.length - 1] == n) {
                    data.viewNodes.pop();
                }
            }

            // Nothing to drop...
            if (!data.viewNodes.length) {
                return false;
            }

            // If we are moving DOWN, then because a store.remove() takes place first,
            // the insertAt must be decremented.
            if (insertAt > this.store.indexOf(data.records[0])) {
                insertAt--;
            }
        }

        // Dragging from a Tree. Use the Tree's recordFromNode function.
        if (data.node instanceof Ext.tree.TreeNode) {
            var r = data.node.getOwnerTree().recordFromNode(data.node);
            if (r) {
                data.records = [ r ];
            }
        }

        if (!data.records) {
            alert("Programming problem. Drag data contained no Records");
            return false;
        }

        for (var i = 0; i < data.records.length; i++) {
            var r = data.records[i];
            var dup = this.store.getById(r.id);
            if (dup && (dd != this.dragZone)) {
                if(!this.allowDup && !this.allowTrash){
                    Ext.fly(this.getNode(this.store.indexOf(dup))).frame("red", 1);
                    return true
                }
                var x=new Ext.data.Record();
                r.id=x.id;
                delete x;
            }
            if (data.copy) {
                this.store.insert(insertAt++, r.copy());
            } else {
                if (data.sourceView) {
                    data.sourceView.isDirtyFlag = true;
                    data.sourceView.store.remove(r);
                }
                if(!this.allowTrash)this.store.insert(insertAt++, r);
            }
            if(this.sortField){
                this.store.sort(this.sortField, this.sortDir);
            }
            this.isDirtyFlag = true;
        }
        this.dragZone.cachedTarget = null;
        return true;
    },

    // private
    onEndDrag: function(data, e) {
        var d = Ext.get(this.dragData.ddel);
        if (d && d.hasClass("multi-proxy")) {
            d.remove();
            //delete this.dragData.ddel;
        }
    },

    // private
    removeDropIndicators : function(n){
        if(n){
            Ext.fly(n).removeClass([
                "x-view-drag-insert-above",
                "x-view-drag-insert-left",
                "x-view-drag-insert-right",
                "x-view-drag-insert-below"]);
            this.lastInsertClass = "_noclass";
        }
    },

	/**
	 * Add a delete option to the DDView's context menu.
	 * @param {String} imageUrl The URL of the "delete" icon image.
	 */
    setDeletable: function(imageUrl) {
        if (!this.singleSelect && !this.multiSelect) {
            this.singleSelect = true;
        }
        var c = this.getContextMenu();
        this.contextMenu.on("itemclick", function(item) {
            switch (item.id) {
                case "delete":
                    this.remove(this.getSelectedIndexes());
                    break;
            }
        }, this);
        this.contextMenu.add({
            icon: imageUrl || AU.resolveUrl("/images/delete.gif"),
            id: "delete",
            text: AU.getMessage("deleteItem")
        });
    },

	/**
	 * Return the context menu for this DDView.
     * @return {Ext.menu.Menu} The context menu
	 */
    getContextMenu: function() {
        if (!this.contextMenu) {
            // Create the View's context menu
            this.contextMenu = new Ext.menu.Menu({
                id: this.id + "-contextmenu"
            });
            this.el.on("contextmenu", this.showContextMenu, this);
        }
        return this.contextMenu;
    },

    /**
     * Disables the view's context menu.
     */
    disableContextMenu: function() {
        if (this.contextMenu) {
            this.el.un("contextmenu", this.showContextMenu, this);
        }
    },

    // private
    showContextMenu: function(e, item) {
        item = this.findItemFromChild(e.getTarget());
        if (item) {
            e.stopEvent();
            this.select(this.getNode(item), this.multiSelect && e.ctrlKey, true);
            this.contextMenu.showAt(e.getXY());
        }
    },

	/**
	 * Remove {@link Ext.data.Record}s at the specified indices.
	 * @param {Array/Number} selectedIndices The index (or Array of indices) of Records to remove.
	 */
    remove: function(selectedIndices) {
        selectedIndices = [].concat(selectedIndices);
        for (var i = 0; i < selectedIndices.length; i++) {
            var rec = this.store.getAt(selectedIndices[i]);
            this.store.remove(rec);
        }
    },

	/**
	 * Double click fires the {@link #dblclick} event. Additionally, if this DDView is draggable, and there is only one other
	 * related DropZone that is in another DDView, it drops the selected node on that DDView.
	 */
    onDblClick : function(e){
        var item = this.findItemFromChild(e.getTarget());
        if(item){
            if (this.fireEvent("dblclick", this, this.indexOf(item), item, e) === false) {
                return false;
            }
            if (this.dragGroup) {
                var targets = Ext.dd.DragDropMgr.getRelated(this.dragZone, true);

                // Remove instances of this View's DropZone
                while (targets.indexOf(this.dropZone) !== -1) {
                    targets.remove(this.dropZone);
                }

                // If there's only one other DropZone, and it is owned by a DDView, then drop it in
                if ((targets.length == 1) && (targets[0].owningView)) {
                    this.dragZone.cachedTarget = null;
                    var el = Ext.get(targets[0].getEl());
                    var box = el.getBox(true);
                    targets[0].onNodeDrop(el.dom, {
                        target: el.dom,
                        xy: [box.x, box.y + box.height - 1]
                    }, null, this.getDragData(e));
                }
            }
        }
    },

    // private
    onItemClick : function(item, index, e){
        // The DragZone's mousedown->getDragData already handled selection
        if (this.ignoreNextClick) {
            delete this.ignoreNextClick;
            return;
        }

        if(this.fireEvent("beforeclick", this, index, item, e) === false){
            return false;
        }
        if(this.multiSelect || this.singleSelect){
            if(this.multiSelect && e.shiftKey && this.lastSelection){
                this.select(this.getNodes(this.indexOf(this.lastSelection), index), false);
            } else if (this.isSelected(item) && e.ctrlKey) {
                this.deselect(item);
            }else{
                this.deselect(item);
                this.select(item, this.multiSelect && e.ctrlKey);
                this.lastSelection = item;
            }
            e.preventDefault();
        }
        return true;
    }
});