| /******************************************************************************* |
| * Copyright (c) 2000, 2010 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.gef.editpolicies; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.draw2d.ColorConstants; |
| import org.eclipse.draw2d.Cursors; |
| import org.eclipse.draw2d.FigureUtilities; |
| import org.eclipse.draw2d.FocusBorder; |
| import org.eclipse.draw2d.Graphics; |
| import org.eclipse.draw2d.IFigure; |
| import org.eclipse.draw2d.Locator; |
| import org.eclipse.draw2d.PositionConstants; |
| import org.eclipse.draw2d.RectangleFigure; |
| import org.eclipse.draw2d.geometry.PrecisionRectangle; |
| import org.eclipse.draw2d.geometry.Rectangle; |
| |
| import org.eclipse.gef.DragTracker; |
| import org.eclipse.gef.GraphicalEditPart; |
| import org.eclipse.gef.Request; |
| import org.eclipse.gef.RequestConstants; |
| import org.eclipse.gef.SharedCursors; |
| import org.eclipse.gef.commands.Command; |
| import org.eclipse.gef.handles.AbstractHandle; |
| import org.eclipse.gef.handles.HandleBounds; |
| import org.eclipse.gef.handles.NonResizableHandleKit; |
| import org.eclipse.gef.handles.ResizableHandleKit; |
| import org.eclipse.gef.requests.AlignmentRequest; |
| import org.eclipse.gef.requests.ChangeBoundsRequest; |
| import org.eclipse.gef.tools.DragEditPartsTracker; |
| import org.eclipse.gef.tools.ResizeTracker; |
| import org.eclipse.gef.tools.SelectEditPartTracker; |
| |
| /** |
| * Provide support for selecting and positioning a non-resizable editpart. |
| * Selection is indicated via four square handles at each corner of the |
| * editpart's figure, and a rectangular handle that outlines the editpart with a |
| * 1-pixel black line. All of these handles return |
| * {@link org.eclipse.gef.tools.DragEditPartsTracker}s, which allows the current |
| * selection to be dragged. |
| * <P> |
| * During feedback, a rectangle filled using XOR and outlined with dashes is |
| * drawn. Subclasses can tailor the feedback. |
| * |
| * @author hudsonr |
| */ |
| public class NonResizableEditPolicy extends SelectionHandlesEditPolicy { |
| |
| private IFigure focusRect; |
| private IFigure feedback; |
| private boolean isDragAllowed = true; |
| |
| /** |
| * Creates the figure used for feedback. |
| * |
| * @return the new feedback figure |
| */ |
| protected IFigure createDragSourceFeedbackFigure() { |
| // Use a ghost rectangle for feedback |
| RectangleFigure r = new RectangleFigure(); |
| FigureUtilities.makeGhostShape(r); |
| r.setLineStyle(Graphics.LINE_DOT); |
| r.setForegroundColor(ColorConstants.white); |
| r.setBounds(getInitialFeedbackBounds()); |
| r.validate(); |
| addFeedback(r); |
| return r; |
| } |
| |
| /** |
| * @see org.eclipse.gef.editpolicies.SelectionHandlesEditPolicy#createSelectionHandles() |
| */ |
| protected List createSelectionHandles() { |
| List list = new ArrayList(); |
| createMoveHandle(list); |
| createDragHandle(list, PositionConstants.NORTH_EAST); |
| createDragHandle(list, PositionConstants.NORTH_WEST); |
| createDragHandle(list, PositionConstants.SOUTH_EAST); |
| createDragHandle(list, PositionConstants.SOUTH_WEST); |
| return list; |
| } |
| |
| /** |
| * Creates a 'resize'/'drag' handle, which uses a |
| * {@link DragEditPartsTracker} in case {@link #isDragAllowed()} returns |
| * true, and a {@link SelectEditPartTracker} otherwise. |
| * |
| * @param handles |
| * The list of handles to add the resize handle to |
| * @param direction |
| * A position constant indicating the direction to create the |
| * handle for |
| * @since 3.7 |
| */ |
| protected void createDragHandle(List handles, int direction) { |
| if (isDragAllowed()) { |
| // display 'resize' handles to allow dragging (drag tracker) |
| NonResizableHandleKit |
| .addHandle((GraphicalEditPart) getHost(), handles, |
| direction, getDragTracker(), SharedCursors.SIZEALL); |
| } else { |
| // display 'resize' handles to indicate selection only (selection |
| // tracker) |
| NonResizableHandleKit |
| .addHandle((GraphicalEditPart) getHost(), handles, |
| direction, getSelectTracker(), SharedCursors.ARROW); |
| } |
| } |
| |
| /** |
| * Returns a selection tracker to use by a selection handle. |
| * |
| * @return a new {@link ResizeTracker} |
| * @since 3.7 |
| */ |
| protected SelectEditPartTracker getSelectTracker() { |
| return new SelectEditPartTracker(getHost()); |
| } |
| |
| /** |
| * Returns a drag tracker to use by a resize handle. |
| * |
| * @return a new {@link ResizeTracker} |
| * @since 3.7 |
| */ |
| protected DragEditPartsTracker getDragTracker() { |
| return new DragEditPartsTracker(getHost()); |
| } |
| |
| /** |
| * Creates a 'move' handle, which uses a {@link DragEditPartsTracker} in |
| * case {@link #isDragAllowed()} returns true, and a |
| * {@link SelectEditPartTracker} otherwise. |
| * |
| * @param handles |
| * The list of handles to add the move handle to. |
| * @since 3.7 |
| */ |
| protected void createMoveHandle(List handles) { |
| if (isDragAllowed()) { |
| // display 'move' handle to allow dragging |
| ResizableHandleKit.addMoveHandle((GraphicalEditPart) getHost(), |
| handles, getDragTracker(), Cursors.SIZEALL); |
| } else { |
| // display 'move' handle only to indicate selection |
| ResizableHandleKit.addMoveHandle((GraphicalEditPart) getHost(), |
| handles, getSelectTracker(), SharedCursors.ARROW); |
| } |
| } |
| |
| /** |
| * @see org.eclipse.gef.EditPolicy#deactivate() |
| */ |
| public void deactivate() { |
| if (feedback != null) { |
| removeFeedback(feedback); |
| feedback = null; |
| } |
| hideFocus(); |
| super.deactivate(); |
| } |
| |
| /** |
| * Erases drag feedback. This method called whenever an erase feedback |
| * request is received of the appropriate type. |
| * |
| * @param request |
| * the request |
| */ |
| protected void eraseChangeBoundsFeedback(ChangeBoundsRequest request) { |
| if (feedback != null) { |
| removeFeedback(feedback); |
| } |
| feedback = null; |
| } |
| |
| /** |
| * @see org.eclipse.gef.EditPolicy#eraseSourceFeedback(org.eclipse.gef.Request) |
| */ |
| public void eraseSourceFeedback(Request request) { |
| if ((REQ_MOVE.equals(request.getType()) && isDragAllowed()) |
| || REQ_CLONE.equals(request.getType()) |
| || REQ_ADD.equals(request.getType())) |
| eraseChangeBoundsFeedback((ChangeBoundsRequest) request); |
| } |
| |
| /** |
| * @see org.eclipse.gef.EditPolicy#getCommand(org.eclipse.gef.Request) |
| */ |
| public Command getCommand(Request request) { |
| Object type = request.getType(); |
| |
| if (REQ_MOVE.equals(type) && isDragAllowed()) |
| return getMoveCommand((ChangeBoundsRequest) request); |
| if (REQ_ORPHAN.equals(type)) |
| return getOrphanCommand(request); |
| if (REQ_ALIGN.equals(type)) |
| return getAlignCommand((AlignmentRequest) request); |
| |
| return null; |
| } |
| |
| /** |
| * Lazily creates and returns the feedback figure used during drags. |
| * |
| * @return the feedback figure |
| */ |
| protected IFigure getDragSourceFeedbackFigure() { |
| if (feedback == null) |
| feedback = createDragSourceFeedbackFigure(); |
| return feedback; |
| } |
| |
| /** |
| * Returns the command contribution to an alignment request |
| * |
| * @param request |
| * the alignment request |
| * @return the contribution to the alignment |
| */ |
| protected Command getAlignCommand(AlignmentRequest request) { |
| AlignmentRequest req = new AlignmentRequest(REQ_ALIGN_CHILDREN); |
| req.setEditParts(getHost()); |
| req.setAlignment(request.getAlignment()); |
| req.setAlignmentRectangle(request.getAlignmentRectangle()); |
| return getHost().getParent().getCommand(req); |
| } |
| |
| /** |
| * Returns the bounds of the host's figure by reference to be used to |
| * calculate the initial location of the feedback. The returned Rectangle |
| * should not be modified. Uses handle bounds if available. |
| * |
| * @return the host figure's bounding Rectangle |
| */ |
| protected Rectangle getInitialFeedbackBounds() { |
| if (((GraphicalEditPart) getHost()).getFigure() instanceof HandleBounds) |
| return ((HandleBounds) ((GraphicalEditPart) getHost()).getFigure()) |
| .getHandleBounds(); |
| return ((GraphicalEditPart) getHost()).getFigure().getBounds(); |
| } |
| |
| /** |
| * Returns the command contribution to a change bounds request. The |
| * implementation actually redispatches the request to the host's parent |
| * editpart as a {@link RequestConstants#REQ_MOVE_CHILDREN} request. The |
| * parent's contribution is returned. |
| * |
| * @param request |
| * the change bounds request |
| * @return the command contribution to the request |
| */ |
| protected Command getMoveCommand(ChangeBoundsRequest request) { |
| ChangeBoundsRequest req = new ChangeBoundsRequest(REQ_MOVE_CHILDREN); |
| req.setEditParts(getHost()); |
| |
| req.setMoveDelta(request.getMoveDelta()); |
| req.setSizeDelta(request.getSizeDelta()); |
| req.setLocation(request.getLocation()); |
| req.setExtendedData(request.getExtendedData()); |
| return getHost().getParent().getCommand(req); |
| } |
| |
| /** |
| * Subclasses may override to contribute to the orphan request. By default, |
| * <code>null</code> is returned to indicate no participation. Orphan |
| * requests are not forwarded to the host's parent here. That is done in |
| * {@link ComponentEditPolicy}. So, if the host has a component editpolicy, |
| * then the parent will already have a chance to contribute. |
| * |
| * @param req |
| * the orphan request |
| * @return <code>null</code> by default |
| */ |
| protected Command getOrphanCommand(Request req) { |
| return null; |
| } |
| |
| /** |
| * Hides the focus rectangle displayed in <code>showFocus()</code>. |
| * |
| * @see #showFocus() |
| * @see org.eclipse.gef.editpolicies.SelectionEditPolicy#hideFocus() |
| */ |
| protected void hideFocus() { |
| if (focusRect != null) |
| removeFeedback(focusRect); |
| focusRect = null; |
| } |
| |
| /** |
| * Returns true if this EditPolicy allows its EditPart to be dragged. |
| * |
| * @return true if the EditPart can be dragged. |
| */ |
| public boolean isDragAllowed() { |
| return isDragAllowed; |
| } |
| |
| /** |
| * Sets the dragability of the EditPolicy to the given value. If the value |
| * is false, the EditPolicy should not allow its EditPart to be dragged. |
| * |
| * @param isDragAllowed |
| * whether or not the EditPolicy can be dragged. |
| */ |
| public void setDragAllowed(boolean isDragAllowed) { |
| if (isDragAllowed == this.isDragAllowed) |
| return; |
| this.isDragAllowed = isDragAllowed; |
| } |
| |
| /** |
| * Shows or updates feedback for a change bounds request. |
| * |
| * @param request |
| * the request |
| */ |
| protected void showChangeBoundsFeedback(ChangeBoundsRequest request) { |
| IFigure feedback = getDragSourceFeedbackFigure(); |
| |
| PrecisionRectangle rect = new PrecisionRectangle( |
| getInitialFeedbackBounds().getCopy()); |
| getHostFigure().translateToAbsolute(rect); |
| rect.translate(request.getMoveDelta()); |
| rect.resize(request.getSizeDelta()); |
| |
| feedback.translateToRelative(rect); |
| feedback.setBounds(rect); |
| feedback.validate(); |
| } |
| |
| /** |
| * Shows a focus rectangle around the host's figure. The focus rectangle is |
| * expanded by 5 pixels from the figure's bounds. |
| * |
| * @see org.eclipse.gef.editpolicies.SelectionEditPolicy#showFocus() |
| */ |
| protected void showFocus() { |
| focusRect = new AbstractHandle((GraphicalEditPart) getHost(), |
| new Locator() { |
| public void relocate(IFigure target) { |
| IFigure figure = getHostFigure(); |
| Rectangle r; |
| if (figure instanceof HandleBounds) |
| r = ((HandleBounds) figure).getHandleBounds() |
| .getCopy(); |
| else |
| r = getHostFigure().getBounds().getResized(-1, -1); |
| getHostFigure().translateToAbsolute(r); |
| target.translateToRelative(r); |
| target.setBounds(r.expand(5, 5).resize(1, 1)); |
| } |
| }) { |
| { |
| setBorder(new FocusBorder()); |
| } |
| |
| protected DragTracker createDragTracker() { |
| return null; |
| } |
| }; |
| addFeedback(focusRect); |
| } |
| |
| /** |
| * Calls other methods as appropriate. |
| * |
| * @see org.eclipse.gef.EditPolicy#showSourceFeedback(org.eclipse.gef.Request) |
| */ |
| public void showSourceFeedback(Request request) { |
| if ((REQ_MOVE.equals(request.getType()) && isDragAllowed()) |
| || REQ_ADD.equals(request.getType()) |
| || REQ_CLONE.equals(request.getType())) |
| showChangeBoundsFeedback((ChangeBoundsRequest) request); |
| } |
| |
| /** |
| * Returns <code>true</code> for move, align, add, and orphan request types. |
| * This method is never called for some of these types, but they are |
| * included for possible future use. |
| * |
| * @see org.eclipse.gef.EditPolicy#understandsRequest(org.eclipse.gef.Request) |
| */ |
| public boolean understandsRequest(Request request) { |
| if (REQ_MOVE.equals(request.getType())) |
| return isDragAllowed(); |
| else if (REQ_CLONE.equals(request.getType()) |
| || REQ_ADD.equals(request.getType()) |
| || REQ_ORPHAN.equals(request.getType()) |
| || REQ_ALIGN.equals(request.getType())) |
| return true; |
| return super.understandsRequest(request); |
| } |
| |
| } |