jsf/plugins/org.eclipse.jst.pagedesigner/src/org/eclipse/jst/pagedesigner/editpolicies/DragMoveEditPolicy.java - jsf/webtools.jsf - Git at Google

 /*******************************************************************************
  * Copyright (c) 2006 Sybase, Inc. and others.
  *
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     Sybase, Inc. - initial API and implementation
  *******************************************************************************/
 package org.eclipse.jst.pagedesigner.editpolicies;

 import org.eclipse.draw2d.ColorConstants;
 import org.eclipse.draw2d.IFigure;
 import org.eclipse.draw2d.Label;
 import org.eclipse.draw2d.LineBorder;
 import org.eclipse.draw2d.RectangleFigure;
 import org.eclipse.draw2d.geometry.Dimension;
 import org.eclipse.draw2d.geometry.Insets;
 import org.eclipse.draw2d.geometry.Point;
 import org.eclipse.draw2d.geometry.Rectangle;
 import org.eclipse.gef.EditPart;
 import org.eclipse.gef.Request;
 import org.eclipse.gef.commands.Command;
 import org.eclipse.gef.commands.UnexecutableCommand;
 import org.eclipse.gef.editpolicies.GraphicalEditPolicy;
 import org.eclipse.gef.requests.ChangeBoundsRequest;
 import org.eclipse.jst.pagedesigner.commands.CloneNodeCommand;
 import org.eclipse.jst.pagedesigner.commands.MoveNodeCommand;
 import org.eclipse.jst.pagedesigner.dom.DOMPositionHelper;
 import org.eclipse.jst.pagedesigner.dom.DOMUtil;
 import org.eclipse.jst.pagedesigner.dom.IDOMPosition;
 import org.eclipse.jst.pagedesigner.parts.ElementEditPart;
 import org.eclipse.jst.pagedesigner.parts.NodeEditPart;
 import org.eclipse.jst.pagedesigner.validation.caret.ActionData;
 import org.eclipse.jst.pagedesigner.validation.caret.DnDPositionValidator;
 import org.eclipse.jst.pagedesigner.validation.caret.IPositionMediator;
 import org.eclipse.jst.pagedesigner.viewer.DesignPosition;
 import org.eclipse.jst.pagedesigner.viewer.EditPartPositionHelper;
 import org.eclipse.jst.pagedesigner.viewer.IHTMLGraphicalViewer;
 import org.w3c.dom.Node;

 /**
  * @author mengbo
  * @version 1.5
  */
 public class DragMoveEditPolicy extends GraphicalEditPolicy {
     // the amount of vertical offset below the mouse pointer to place
     // the upper left of the drop hint tooltip
 	private static final int DROP_HINT_VERTICAL_OFFSET = 20;
     private RectangleFigure _feedbackFigure;
     private Label           _dropHintLabel;

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.gef.editpolicies.AbstractEditPolicy#getCommand(org.eclipse.gef.Request)
 	 */
 	public Command getCommand(Request request) {
 		if (!(request instanceof ChangeBoundsRequest)) {
 			return null;
 		}

 		ChangeBoundsRequest r = (ChangeBoundsRequest) request;

 		// we only support move/copy a single node.
 		if (!MoveSupport.isSingleNode(r)) {
 			return UnexecutableCommand.INSTANCE;
 		}

 		// the edit policy only handle at the target part, so only care about
 		// the
 		// target part request.
 		final Object type = r.getType();
 		if (type != REQ_ADD && type != REQ_CLONE && type != REQ_MOVE_CHILDREN) {

 			return null;
 		}

 		Node draggedNode = MoveSupport.getDraggedNode(r);
 		Node hostNode = ((NodeEditPart) getHost()).getIDOMNode();

 		if (DOMUtil.isAncester(draggedNode, hostNode)) {
 			return UnexecutableCommand.INSTANCE;
 		}

 		// System.out.println();
 		// System.out.println("r.type = " + r.getType());
 		// System.out.println("Host: " + hostNode);
 		// System.out.println("Dragged: " + draggedNode);

 		DesignPosition position = findPosition(r);
 		if (position == null || !position.isValid()) {
 			return null;
 		}

 		// can't move/copy into self.
 		Node node = position.getContainerNode();
 		if (DOMUtil.isAncester(draggedNode, node)) {
 			return UnexecutableCommand.INSTANCE;
 		}

 		// ok, we are about to move/copy into the specified position.
 		IDOMPosition domposition = DOMPositionHelper.toDOMPosition(position);

 		if (REQ_CLONE.equals(type)) {
 			return new CloneNodeCommand((IHTMLGraphicalViewer) getHost()
 					.getViewer(), domposition, draggedNode);
 		}
         return new MoveNodeCommand((IHTMLGraphicalViewer) getHost()
         		.getViewer(), domposition, draggedNode);
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.gef.editpolicies.AbstractEditPolicy#getTargetEditPart(org.eclipse.gef.Request)
 	 */
 	public EditPart getTargetEditPart(Request request) {
 		if (request instanceof ChangeBoundsRequest) {
 			return this.getHost();
 		}
 		return super.getTargetEditPart(request);
 	}

 	DesignPosition findPosition(ChangeBoundsRequest r) {
 		IPositionMediator mediator = new DnDPositionValidator(new ActionData(
 				ActionData.COMPONENT_MOVE, r.getEditParts()));
 		DesignPosition position = EditPartPositionHelper.findEditPartPosition(
 				getHost(), r.getLocation(), mediator);
 		return position;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.gef.editpolicies.AbstractEditPolicy#eraseTargetFeedback(org.eclipse.gef.Request)
 	 */
 	public void eraseTargetFeedback(Request request) {
 		if (_feedbackFigure != null)
 //                && getFeedbackLayer().getChildren().contains(_feedbackFigure))
         {
 			removeFeedback(_feedbackFigure);
 			_feedbackFigure = null;
 		}

         if (_dropHintLabel != null)
 //                && getFeedbackLayer().getChildren().contains(_dropHintLabel))
         {
             removeFeedback(_dropHintLabel);
             _dropHintLabel = null;
         }
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.gef.editpolicies.AbstractEditPolicy#showTargetFeedback(org.eclipse.gef.Request)
 	 */
 	public void showTargetFeedback(Request request) {
 		if (request instanceof ChangeBoundsRequest) {
 			ChangeBoundsRequest r = (ChangeBoundsRequest) request;

 			Object type = r.getType();
 			if (type != REQ_ADD && type != REQ_CLONE
 					&& type != REQ_MOVE_CHILDREN) {
 				return;
 			}
 			//TODO: not used EditPart host = getHost();
 			DesignPosition position = findPosition(r);
 			if (position != null) {
 				Rectangle rect = EditPartPositionHelper
 						.convertToAbsoluteCaretRect(position);

 				// to avoid enlarge feedback pane.
 				rect = rect.intersect(getFeedbackLayer().getBounds());
 				showFeedbackRect(rect);
                 showDropHintLabel(r.getLocation(), position);
 			}
 		}
 	}

 	protected RectangleFigure getFeedbackFigure() {
 		if (this._feedbackFigure == null) {
 			_feedbackFigure = new RectangleFigure();
 			_feedbackFigure.setFill(true);
 			_feedbackFigure.setOutline(true);
 			_feedbackFigure.setLineWidth(1);
 			_feedbackFigure.setForegroundColor(ColorConstants.red);
 			_feedbackFigure.setBounds(new Rectangle(0, 0, 0, 0));
 			_feedbackFigure.setXOR(true);
 			addFeedback(_feedbackFigure);
 		}
 		return _feedbackFigure;
 	}

 	protected void showFeedbackRect(Rectangle rect) {
 		RectangleFigure pf = getFeedbackFigure();
 		pf.translateToRelative(rect);
 		pf.setBounds(rect);
 	}

     /**
      * Shows a label in a position relative to the drop marker
      * that hints where the new component will be dropped in
      * respect of components already there
      */
     protected void showDropHintLabel(Point mousePosition, DesignPosition position)
     {
         if (_dropHintLabel == null){
             _dropHintLabel = new Label();
             _dropHintLabel.setOpaque(true);
             _dropHintLabel.setBackgroundColor(ColorConstants.tooltipBackground);
             _dropHintLabel.setBorder(
                     new LineBorder(ColorConstants.black, 1)
                     {
                         // add an extra pixel of inset to make sure the text
                         // isn't pressed against the border
                         public Insets getInsets(IFigure figure) {
                             return new Insets(getWidth()+1);
                         }
                     }
             );
             addFeedback(_dropHintLabel);
         }
         final String hintText = getDropHintText(position);
         _dropHintLabel.setText(hintText);
         //TODO: need to handle viewport clipping and adjust label location appropriately
         Dimension hintSize = _dropHintLabel.getPreferredSize();
         Point hintLocation = new Point(mousePosition.x, mousePosition.y+DROP_HINT_VERTICAL_OFFSET);

         Rectangle hintRect = new Rectangle(hintLocation, hintSize);

         // to avoid enlarge feedback pane.
         //hintRect = hintRect.intersect(getFeedbackLayer().getBounds());
         _dropHintLabel.setBounds(hintRect);
     }

     private String getDropHintText(DesignPosition position)
     {
         StringBuffer buffer = new StringBuffer("Place");

         EditPart prevPart = position.getSiblingEditPart(false);
         EditPart nextPart = position.getSiblingEditPart(true);

         if (nextPart instanceof ElementEditPart)
         {
             buffer.append(" before ");
             buffer.append(((ElementEditPart)nextPart).getTagConvert().getHostElement().getNodeName());
             buffer.append(",");
         }

         if (prevPart instanceof ElementEditPart)
         {
             buffer.append(" after ");
             buffer.append(((ElementEditPart)prevPart).getTagConvert().getHostElement().getNodeName());
             buffer.append(",");
         }

         buffer.append(" inside ");
         buffer.append(position.getContainerNode().getNodeName());

         return buffer.toString();
     }
 }
	/*******************************************************************************
	* Copyright (c) 2006 Sybase, Inc. and others.
	*
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* Sybase, Inc. - initial API and implementation
	*******************************************************************************/
	package org.eclipse.jst.pagedesigner.editpolicies;

	import org.eclipse.draw2d.ColorConstants;
	import org.eclipse.draw2d.IFigure;
	import org.eclipse.draw2d.Label;
	import org.eclipse.draw2d.LineBorder;
	import org.eclipse.draw2d.RectangleFigure;
	import org.eclipse.draw2d.geometry.Dimension;
	import org.eclipse.draw2d.geometry.Insets;
	import org.eclipse.draw2d.geometry.Point;
	import org.eclipse.draw2d.geometry.Rectangle;
	import org.eclipse.gef.EditPart;
	import org.eclipse.gef.Request;
	import org.eclipse.gef.commands.Command;
	import org.eclipse.gef.commands.UnexecutableCommand;
	import org.eclipse.gef.editpolicies.GraphicalEditPolicy;
	import org.eclipse.gef.requests.ChangeBoundsRequest;
	import org.eclipse.jst.pagedesigner.commands.CloneNodeCommand;
	import org.eclipse.jst.pagedesigner.commands.MoveNodeCommand;
	import org.eclipse.jst.pagedesigner.dom.DOMPositionHelper;
	import org.eclipse.jst.pagedesigner.dom.DOMUtil;
	import org.eclipse.jst.pagedesigner.dom.IDOMPosition;
	import org.eclipse.jst.pagedesigner.parts.ElementEditPart;
	import org.eclipse.jst.pagedesigner.parts.NodeEditPart;
	import org.eclipse.jst.pagedesigner.validation.caret.ActionData;
	import org.eclipse.jst.pagedesigner.validation.caret.DnDPositionValidator;
	import org.eclipse.jst.pagedesigner.validation.caret.IPositionMediator;
	import org.eclipse.jst.pagedesigner.viewer.DesignPosition;
	import org.eclipse.jst.pagedesigner.viewer.EditPartPositionHelper;
	import org.eclipse.jst.pagedesigner.viewer.IHTMLGraphicalViewer;
	import org.w3c.dom.Node;

	/**
	* @author mengbo
	* @version 1.5
	*/
	public class DragMoveEditPolicy extends GraphicalEditPolicy {
	// the amount of vertical offset below the mouse pointer to place
	// the upper left of the drop hint tooltip
	private static final int DROP_HINT_VERTICAL_OFFSET = 20;
	private RectangleFigure _feedbackFigure;
	private Label _dropHintLabel;

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.gef.editpolicies.AbstractEditPolicy#getCommand(org.eclipse.gef.Request)
	*/
	public Command getCommand(Request request) {
	if (!(request instanceof ChangeBoundsRequest)) {
	return null;
	}

	ChangeBoundsRequest r = (ChangeBoundsRequest) request;

	// we only support move/copy a single node.
	if (!MoveSupport.isSingleNode(r)) {
	return UnexecutableCommand.INSTANCE;
	}

	// the edit policy only handle at the target part, so only care about
	// the
	// target part request.
	final Object type = r.getType();
	if (type != REQ_ADD && type != REQ_CLONE && type != REQ_MOVE_CHILDREN) {

	return null;
	}

	Node draggedNode = MoveSupport.getDraggedNode(r);
	Node hostNode = ((NodeEditPart) getHost()).getIDOMNode();

	if (DOMUtil.isAncester(draggedNode, hostNode)) {
	return UnexecutableCommand.INSTANCE;
	}

	// System.out.println();
	// System.out.println("r.type = " + r.getType());
	// System.out.println("Host: " + hostNode);
	// System.out.println("Dragged: " + draggedNode);

	DesignPosition position = findPosition(r);
	if (position == null \|\| !position.isValid()) {
	return null;
	}

	// can't move/copy into self.
	Node node = position.getContainerNode();
	if (DOMUtil.isAncester(draggedNode, node)) {
	return UnexecutableCommand.INSTANCE;
	}

	// ok, we are about to move/copy into the specified position.
	IDOMPosition domposition = DOMPositionHelper.toDOMPosition(position);

	if (REQ_CLONE.equals(type)) {
	return new CloneNodeCommand((IHTMLGraphicalViewer) getHost()
	.getViewer(), domposition, draggedNode);
	}
	return new MoveNodeCommand((IHTMLGraphicalViewer) getHost()
	.getViewer(), domposition, draggedNode);
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.gef.editpolicies.AbstractEditPolicy#getTargetEditPart(org.eclipse.gef.Request)
	*/
	public EditPart getTargetEditPart(Request request) {
	if (request instanceof ChangeBoundsRequest) {
	return this.getHost();
	}
	return super.getTargetEditPart(request);
	}

	DesignPosition findPosition(ChangeBoundsRequest r) {
	IPositionMediator mediator = new DnDPositionValidator(new ActionData(
	ActionData.COMPONENT_MOVE, r.getEditParts()));
	DesignPosition position = EditPartPositionHelper.findEditPartPosition(
	getHost(), r.getLocation(), mediator);
	return position;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.gef.editpolicies.AbstractEditPolicy#eraseTargetFeedback(org.eclipse.gef.Request)
	*/
	public void eraseTargetFeedback(Request request) {
	if (_feedbackFigure != null)
	// && getFeedbackLayer().getChildren().contains(_feedbackFigure))
	{
	removeFeedback(_feedbackFigure);
	_feedbackFigure = null;
	}

	if (_dropHintLabel != null)
	// && getFeedbackLayer().getChildren().contains(_dropHintLabel))
	{
	removeFeedback(_dropHintLabel);
	_dropHintLabel = null;
	}
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.gef.editpolicies.AbstractEditPolicy#showTargetFeedback(org.eclipse.gef.Request)
	*/
	public void showTargetFeedback(Request request) {
	if (request instanceof ChangeBoundsRequest) {
	ChangeBoundsRequest r = (ChangeBoundsRequest) request;

	Object type = r.getType();
	if (type != REQ_ADD && type != REQ_CLONE
	&& type != REQ_MOVE_CHILDREN) {
	return;
	}
	//TODO: not used EditPart host = getHost();
	DesignPosition position = findPosition(r);
	if (position != null) {
	Rectangle rect = EditPartPositionHelper
	.convertToAbsoluteCaretRect(position);

	// to avoid enlarge feedback pane.
	rect = rect.intersect(getFeedbackLayer().getBounds());
	showFeedbackRect(rect);
	showDropHintLabel(r.getLocation(), position);
	}
	}
	}

	protected RectangleFigure getFeedbackFigure() {
	if (this._feedbackFigure == null) {
	_feedbackFigure = new RectangleFigure();
	_feedbackFigure.setFill(true);
	_feedbackFigure.setOutline(true);
	_feedbackFigure.setLineWidth(1);
	_feedbackFigure.setForegroundColor(ColorConstants.red);
	_feedbackFigure.setBounds(new Rectangle(0, 0, 0, 0));
	_feedbackFigure.setXOR(true);
	addFeedback(_feedbackFigure);
	}
	return _feedbackFigure;
	}

	protected void showFeedbackRect(Rectangle rect) {
	RectangleFigure pf = getFeedbackFigure();
	pf.translateToRelative(rect);
	pf.setBounds(rect);
	}

	/**
	* Shows a label in a position relative to the drop marker
	* that hints where the new component will be dropped in
	* respect of components already there
	*/
	protected void showDropHintLabel(Point mousePosition, DesignPosition position)
	{
	if (_dropHintLabel == null){
	_dropHintLabel = new Label();
	_dropHintLabel.setOpaque(true);
	_dropHintLabel.setBackgroundColor(ColorConstants.tooltipBackground);
	_dropHintLabel.setBorder(
	new LineBorder(ColorConstants.black, 1)
	{
	// add an extra pixel of inset to make sure the text
	// isn't pressed against the border
	public Insets getInsets(IFigure figure) {
	return new Insets(getWidth()+1);
	}
	}
	);
	addFeedback(_dropHintLabel);
	}
	final String hintText = getDropHintText(position);
	_dropHintLabel.setText(hintText);
	//TODO: need to handle viewport clipping and adjust label location appropriately
	Dimension hintSize = _dropHintLabel.getPreferredSize();
	Point hintLocation = new Point(mousePosition.x, mousePosition.y+DROP_HINT_VERTICAL_OFFSET);

	Rectangle hintRect = new Rectangle(hintLocation, hintSize);

	// to avoid enlarge feedback pane.
	//hintRect = hintRect.intersect(getFeedbackLayer().getBounds());
	_dropHintLabel.setBounds(hintRect);
	}

	private String getDropHintText(DesignPosition position)
	{
	StringBuffer buffer = new StringBuffer("Place");

	EditPart prevPart = position.getSiblingEditPart(false);
	EditPart nextPart = position.getSiblingEditPart(true);

	if (nextPart instanceof ElementEditPart)
	{
	buffer.append(" before ");
	buffer.append(((ElementEditPart)nextPart).getTagConvert().getHostElement().getNodeName());
	buffer.append(",");
	}

	if (prevPart instanceof ElementEditPart)
	{
	buffer.append(" after ");
	buffer.append(((ElementEditPart)prevPart).getTagConvert().getHostElement().getNodeName());
	buffer.append(",");
	}

	buffer.append(" inside ");
	buffer.append(position.getContainerNode().getNodeName());

	return buffer.toString();
	}
	}