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/*******************************************************************************
* Copyright (c) 2015, 2016 THALES GLOBAL SERVICES.
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Obeo - initial API and implementation
*******************************************************************************/
package org.eclipse.sirius.diagram.ui.tools.internal.ui;
import org.eclipse.draw2d.FigureCanvas;
import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.EditPartViewer;
import org.eclipse.gef.SharedCursors;
import org.eclipse.gef.requests.ChangeBoundsRequest;
import org.eclipse.gmf.runtime.diagram.ui.tools.DragEditPartsTrackerEx;
import org.eclipse.sirius.ext.gmf.runtime.diagram.ui.tools.MoveInDiagramDragTracker;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.MouseEvent;
/**
* A specific dragEditPartTracket that allows to change the behavior of
* SnapToShape (capability to snap to all shapes and not only brothers one).
*
* @author <a href="mailto:laurent.redor@obeo.fr">Laurent Redor</a>
*
*/
public class SnapToAllDragEditPartsTracker extends DragEditPartsTrackerEx implements MoveInDiagramDragTracker {
/**
* Constant passed to extended data of the request to keep the chosen mode
* (with KEY {@link #SNAP_TO_ALL}.
*/
public static final String SNAP_TO_ALL_SHAPE_KEY = "snapToAllShape"; //$NON-NLS-1$
/**
* The default mode for {@link #snapToAllShape}.
*/
public static final boolean DEFAULT_SNAP_TO_SHAPE_MODE = false;
/**
* The key shortcut used to change the default behavior of snap to shape.
*/
public static final int SNAP_TO_ALL = SWT.F4;
/**
* The mode of this tracker concerning the snap to shape:
* <UL>
* <LI>true to snap to all shapes and not only brothers ones,</LI>
* <LI>false otherwise.</LI>
* </UL>
* This variable is used when the request is updated to add an extended data
* to the request.
*/
boolean snapToAllShape = SnapToAllDragEditPartsTracker.DEFAULT_SNAP_TO_SHAPE_MODE;
private Point previousMouseLocation;
/**
* Default constructor.
*
* @param sourceEditPart
* the source edit part
*/
public SnapToAllDragEditPartsTracker(EditPart sourceEditPart) {
super(sourceEditPart);
}
/**
* Overridden to update the {@link ChangeBoundsRequest} with information
* about snapToAll mode.
*
* {@inheritDoc}
*/
@Override
protected void snapPoint(ChangeBoundsRequest request) {
if (snapToAllShape) {
getTargetRequest().getExtendedData().put(SnapToAllDragEditPartsTracker.SNAP_TO_ALL_SHAPE_KEY, Boolean.TRUE);
} else {
getTargetRequest().getExtendedData().put(SnapToAllDragEditPartsTracker.SNAP_TO_ALL_SHAPE_KEY, Boolean.FALSE);
}
super.snapPoint(request);
}
@Override
protected boolean handleKeyDown(KeyEvent event) {
if (SnapToAllDragEditPartsTracker.SNAP_TO_ALL == event.keyCode) {
snapToAllShape = !SnapToAllDragEditPartsTracker.DEFAULT_SNAP_TO_SHAPE_MODE;
return true;
}
return super.handleKeyDown(event);
}
@Override
protected boolean handleKeyUp(KeyEvent event) {
if (SnapToAllDragEditPartsTracker.SNAP_TO_ALL == event.keyCode) {
snapToAllShape = SnapToAllDragEditPartsTracker.DEFAULT_SNAP_TO_SHAPE_MODE;
return true;
}
return super.handleKeyUp(event);
}
@Override
protected boolean handleButtonUp(int button) {
boolean result = super.handleButtonUp(button);
// Clean up the mode to original state.
snapToAllShape = SnapToAllDragEditPartsTracker.DEFAULT_SNAP_TO_SHAPE_MODE;
return result;
}
@Override
protected boolean handleButtonDown(int button) {
if (button == 2) {
setCursor(SharedCursors.HAND);
return stateTransition(STATE_INITIAL, STATE_SCROLL_DIAGRAM);
} else {
return super.handleButtonDown(button);
}
}
@Override
public void mouseDrag(MouseEvent me, EditPartViewer viewer) {
previousMouseLocation = getCurrentInput().getMouseLocation().getCopy();
super.mouseDrag(me, viewer);
}
@Override
protected boolean handleDragStarted() {
if (isInState(STATE_SCROLL_DIAGRAM)) {
return stateTransition(STATE_SCROLL_DIAGRAM, STATE_SCROLL_DIAGRAM_IN_PROGRESS);
}
return super.handleDragStarted();
}
@Override
protected boolean handleDragInProgress() {
if (isInState(STATE_SCROLL_DIAGRAM_IN_PROGRESS)) {
if (getCurrentViewer().getControl() instanceof FigureCanvas) {
FigureCanvas figureCanvas = (FigureCanvas) getCurrentViewer().getControl();
Point currentMouseLocation = getCurrentInput().getMouseLocation();
Dimension difference = previousMouseLocation.getDifference(currentMouseLocation);
Point location = figureCanvas.getViewport().getViewLocation();
figureCanvas.scrollTo(location.x + difference.width, location.y + difference.height);
}
return true;
}
return super.handleDragInProgress();
}
}
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