Struts example source code file (TreeDragAndDropV3.js)

This example Struts source code file (TreeDragAndDropV3.js) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Struts tags/keywords

dnd, dnd, dndmode, dndmode

The Struts TreeDragAndDropV3.js source code

/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/



dojo.provide("dojo.dnd.TreeDragAndDropV3");
dojo.require("dojo.dnd.HtmlDragAndDrop");
dojo.require("dojo.lang.func");
dojo.require("dojo.lang.array");
dojo.require("dojo.lang.extras");
dojo.require("dojo.Deferred");
dojo.require("dojo.html.layout");
dojo.dnd.TreeDragSourceV3 = function (node, syncController, type, treeNode) {
	this.controller = syncController;
	this.treeNode = treeNode;
	dojo.dnd.HtmlDragSource.call(this, node, type);
};
dojo.inherits(dojo.dnd.TreeDragSourceV3, dojo.dnd.HtmlDragSource);
dojo.dnd.TreeDropTargetV3 = function (domNode, controller, type, treeNode) {
	this.treeNode = treeNode;
	this.controller = controller;
	dojo.dnd.HtmlDropTarget.call(this, domNode, type);
};
dojo.inherits(dojo.dnd.TreeDropTargetV3, dojo.dnd.HtmlDropTarget);
dojo.lang.extend(dojo.dnd.TreeDropTargetV3, {autoExpandDelay:1500, autoExpandTimer:null, position:null, indicatorStyle:"2px black groove", showIndicator:function (position) {
	if (this.position == position) {
		return;
	}
	this.hideIndicator();
	this.position = position;
	var node = this.treeNode;
	node.contentNode.style.width = dojo.html.getBorderBox(node.labelNode).width + "px";
	if (position == "onto") {
		node.contentNode.style.border = this.indicatorStyle;
	} else {
		if (position == "before") {
			node.contentNode.style.borderTop = this.indicatorStyle;
		} else {
			if (position == "after") {
				node.contentNode.style.borderBottom = this.indicatorStyle;
			}
		}
	}
}, hideIndicator:function () {
	this.treeNode.contentNode.style.borderBottom = "";
	this.treeNode.contentNode.style.borderTop = "";
	this.treeNode.contentNode.style.border = "";
	this.treeNode.contentNode.style.width = "";
	this.position = null;
}, onDragOver:function (e) {
	var accepts = dojo.dnd.HtmlDropTarget.prototype.onDragOver.apply(this, arguments);
	if (accepts && this.treeNode.isFolder && !this.treeNode.isExpanded) {
		this.setAutoExpandTimer();
	}
	if (accepts) {
		this.cacheNodeCoords();
	}
	return accepts;
}, accepts:function (dragObjects) {
	var accepts = dojo.dnd.HtmlDropTarget.prototype.accepts.apply(this, arguments);
	if (!accepts) {
		return false;
	}
	for (var i = 0; i < dragObjects.length; i++) {
		var sourceTreeNode = dragObjects[i].treeNode;
		if (sourceTreeNode === this.treeNode) {
			return false;
		}
	}
	return true;
}, setAutoExpandTimer:function () {
	var _this = this;
	var autoExpand = function () {
		if (dojo.dnd.dragManager.currentDropTarget === _this) {
			_this.controller.expand(_this.treeNode);
			dojo.dnd.dragManager.cacheTargetLocations();
		}
	};
	this.autoExpandTimer = dojo.lang.setTimeout(autoExpand, _this.autoExpandDelay);
}, getAcceptPosition:function (e, dragObjects) {
	var DndMode = this.treeNode.tree.DndMode;
	if (DndMode & dojo.widget.TreeV3.prototype.DndModes.ONTO && this.treeNode.actionIsDisabledNow(this.treeNode.actions.ADDCHILD)) {
		DndMode &= ~dojo.widget.TreeV3.prototype.DndModes.ONTO;
	}
	var position = this.getPosition(e, DndMode);
	if (position == "onto") {
		return position;
	}
	for (var i = 0; i < dragObjects.length; i++) {
		var source = dragObjects[i].dragSource;
		if (source.treeNode && this.isAdjacentNode(source.treeNode, position)) {
			continue;
		}
		if (!this.controller.canMove(source.treeNode ? source.treeNode : source, this.treeNode.parent)) {
			return false;
		}
	}
	return position;
}, onDropEnd:function (e) {
	this.clearAutoExpandTimer();
	this.hideIndicator();
}, onDragOut:function (e) {
	this.clearAutoExpandTimer();
	this.hideIndicator();
}, clearAutoExpandTimer:function () {
	if (this.autoExpandTimer) {
		clearTimeout(this.autoExpandTimer);
		this.autoExpandTimer = null;
	}
}, onDragMove:function (e, dragObjects) {
	var position = this.getAcceptPosition(e, dragObjects);
	if (position) {
		this.showIndicator(position);
	}
}, isAdjacentNode:function (sourceNode, position) {
	if (sourceNode === this.treeNode) {
		return true;
	}
	if (sourceNode.getNextSibling() === this.treeNode && position == "before") {
		return true;
	}
	if (sourceNode.getPreviousSibling() === this.treeNode && position == "after") {
		return true;
	}
	return false;
}, cacheNodeCoords:function () {
	var node = this.treeNode.contentNode;
	this.cachedNodeY = dojo.html.getAbsolutePosition(node).y;
	this.cachedNodeHeight = dojo.html.getBorderBox(node).height;
}, getPosition:function (e, DndMode) {
	var mousey = e.pageY || e.clientY + dojo.body().scrollTop;
	var relY = mousey - this.cachedNodeY;
	var p = relY / this.cachedNodeHeight;
	var position = "";
	if (DndMode & dojo.widget.TreeV3.prototype.DndModes.ONTO && DndMode & dojo.widget.TreeV3.prototype.DndModes.BETWEEN) {
		if (p <= 0.33) {
			position = "before";
		} else {
			if (p <= 0.66 || this.treeNode.isExpanded && this.treeNode.children.length && !this.treeNode.isLastChild()) {
				position = "onto";
			} else {
				position = "after";
			}
		}
	} else {
		if (DndMode & dojo.widget.TreeV3.prototype.DndModes.BETWEEN) {
			if (p <= 0.5 || this.treeNode.isExpanded && this.treeNode.children.length && !this.treeNode.isLastChild()) {
				position = "before";
			} else {
				position = "after";
			}
		} else {
			if (DndMode & dojo.widget.TreeV3.prototype.DndModes.ONTO) {
				position = "onto";
			}
		}
	}
	return position;
}, getTargetParentIndex:function (source, position) {
	var index = position == "before" ? this.treeNode.getParentIndex() : this.treeNode.getParentIndex() + 1;
	if (source.treeNode && this.treeNode.parent === source.treeNode.parent && this.treeNode.getParentIndex() > source.treeNode.getParentIndex()) {
		index--;
	}
	return index;
}, onDrop:function (e) {
	var position = this.position;
	var source = e.dragObject.dragSource;
	var targetParent, targetIndex;
	if (position == "onto") {
		targetParent = this.treeNode;
		targetIndex = 0;
	} else {
		targetIndex = this.getTargetParentIndex(source, position);
		targetParent = this.treeNode.parent;
	}
	var r = this.getDropHandler(e, source, targetParent, targetIndex)();
	return r;
}, getDropHandler:function (e, source, targetParent, targetIndex) {
	var handler;
	var _this = this;
	handler = function () {
		var result;
		if (source.treeNode) {
			result = _this.controller.move(source.treeNode, targetParent, targetIndex, true);
		} else {
			if (dojo.lang.isFunction(source.onDrop)) {
				source.onDrop(targetParent, targetIndex);
			}
			var treeNode = source.getTreeNode();
			if (treeNode) {
				result = _this.controller.createChild(targetParent, targetIndex, treeNode, true);
			} else {
				result = true;
			}
		}
		if (result instanceof dojo.Deferred) {
			var isSuccess = result.fired == 0;
			if (!isSuccess) {
				_this.handleDropError(source, targetParent, targetIndex, result);
			}
			return isSuccess;
		} else {
			return result;
		}
	};
	return handler;
}, handleDropError:function (source, parent, index, result) {
	dojo.debug("TreeDropTargetV3.handleDropError: DND error occured");
	dojo.debugShallow(result);
}});