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/*******************************************************************************
* Copyright (c) 2009, 2017 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.draw2d.geometry.PrecisionPoint;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.EditPartViewer;
import org.eclipse.gef.GraphicalEditPart;
import org.eclipse.gef.SharedCursors;
import org.eclipse.gef.requests.ChangeBoundsRequest;
import org.eclipse.sirius.ext.gmf.runtime.diagram.ui.tools.MoveInDiagramDragTracker;
import org.eclipse.swt.events.MouseEvent;
/**
* Specific implementation of
* {@link org.eclipse.gmf.runtime.diagram.ui.tools.DragEditPartsTrackerEx}.
* <br/>
* It adds margins around parent dragged edit part in order to lower drag 'n
* drop sensibility.
*
* @author dlecan
*/
public class SiriusDragEditPartsTrackerEx extends SnapToAllDragEditPartsTracker implements MoveInDiagramDragTracker {
/**
* The x margin used when moving bordered node to not have drag'n drop
* considered.
*/
private static final int X_MARGIN = 30;
/**
* The y margin used when moving bordered node to not have drag'n drop
* considered.
*/
private static final int Y_MARGIN = X_MARGIN;
private Point previousMouseLocation;
/**
* Constructor.
*
* @param sourceEditPart
* Edit part.
*/
public SiriusDragEditPartsTrackerEx(final EditPart sourceEditPart) {
super(sourceEditPart);
}
/**
* Overridden to find the {@link EditPart} under the adapted mouse location,
* to allow when moving bordered node to not have drag'n drop considered.
*
* {@inheritDoc}
*/
@Override
protected boolean updateTargetUnderMouse() {
if (!isTargetLocked()) {
EditPart editPart = getCurrentViewer().findObjectAtExcluding(getAdaptedMouseLocation(), getExclusionSet(), getTargetingConditional());
if (editPart != null) {
editPart = editPart.getTargetEditPart(getTargetRequest());
}
final boolean changed = getTargetEditPart() != editPart;
setTargetEditPart(editPart);
return changed;
} else {
return false;
}
}
/**
* Get the parent of the current edit part.
*
* @return The parent of the current edit part
*/
protected EditPart getSourceParentEditPart() {
final EditPart parent = getSourceEditPart().getParent();
return parent;
}
/**
* Indicates if mouse location has to be adapted.
*
* @param parentBounds
* Parent bounds
* @param mouseLocation
* Current mouse location
* @return <code>true</code> if mouse location has to be adapted.
* <code>false</code> otherwise
*/
protected boolean hasToAdaptMouseLocation(final Rectangle parentBounds, final Point mouseLocation) {
final Rectangle boundsAndMargins = parentBounds.getExpanded(X_MARGIN, Y_MARGIN);
return boundsAndMargins.contains(mouseLocation) && !parentBounds.contains(mouseLocation);
}
/**
* Adapt mouse location. Algorithm does an homothetic transformation,
* centered on center of the provided rectangle to relocalize mouse
* position.
*
* @return Relocated mouse position.
*/
protected Point getAdaptedMouseLocation() {
final Rectangle parentBounds = getAbsoluteSourceParentBounds();
final Point mouseRealLocation = super.getLocation();
Point mouseAdaptedLocation;
if (hasToAdaptMouseLocation(parentBounds, mouseRealLocation)) {
final Point center = parentBounds.getCenter();
final Dimension rectangleDimension = parentBounds.getSize();
final double xLocation = getAdaptedMouseXLocation(mouseRealLocation.x, center.x, rectangleDimension.width);
final double yLocation = getAdaptedMouseYLocation(mouseRealLocation.y, center.y, rectangleDimension.height);
mouseAdaptedLocation = new PrecisionPoint(xLocation, yLocation);
} else {
mouseAdaptedLocation = mouseRealLocation.getCopy();
}
return mouseAdaptedLocation;
}
/**
* Get absolute parent bounds.
*
* @return absolute parent bounds
*/
private Rectangle getAbsoluteSourceParentBounds() {
final EditPart parent = getSourceParentEditPart();
final Rectangle absoluteBounds = ((GraphicalEditPart) parent).getFigure().getBounds().getCopy();
((GraphicalEditPart) parent).getFigure().translateToAbsolute(absoluteBounds);
return absoluteBounds;
}
private double getAdaptedMouseXLocation(final int xMouseLocation, final int xCenter, final double width) {
return getAdaptedMouseCoordinateLocation(xMouseLocation, xCenter, width, X_MARGIN);
}
private double getAdaptedMouseYLocation(final int yMouseLocation, final int yCenter, final double height) {
return getAdaptedMouseCoordinateLocation(yMouseLocation, yCenter, height, Y_MARGIN);
}
private double getAdaptedMouseCoordinateLocation(final int mouseLocation, final int center, final double length, final int delta) {
final double halfLength = length / 2;
final double result = center + (halfLength / (halfLength + delta)) * (mouseLocation - center);
return result;
}
/**
* Overridden to update the created {@link ChangeBoundsRequest} to use the
* adapted mouse location, to allow when moving bordered node to not have
* drag'n drop considered.
*
* {@inheritDoc}
*/
@Override
protected void updateTargetRequest() {
super.updateTargetRequest();
if (getTargetRequest() instanceof ChangeBoundsRequest) {
ChangeBoundsRequest targetRequest = (ChangeBoundsRequest) getTargetRequest();
targetRequest.setLocation(getAdaptedMouseLocation());
}
}
/**
* Always disable the clone with Ctrl key in Sirius because it only clone
* the graphical element and not the semantic element.
*
* @param cloneActive
* true if cloning should be active (never considered here)
* @see org.eclipse.gef.tools.DragEditPartsTracker#setCloneActive(boolean)
*/
@Override
protected void setCloneActive(boolean cloneActive) {
super.setCloneActive(false);
}
@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
protected boolean handleButtonUp(int button) {
// The above code is copied from the super classes (SnapToAllDragEditPartsTracker, DragEditPartsTracker and
// SelectEditPartTracker) to disable the reveal.
boolean result = false;
if (stateTransition(STATE_DRAG_IN_PROGRESS, STATE_TERMINAL)) {
eraseSourceFeedback();
eraseTargetFeedback();
performDrag();
result = true;
} else if (isInState(STATE_DRAG)) {
performSelection();
if (getFlag(org.eclipse.gef.tools.SelectEditPartTracker.MAX_FLAG))
// SelectEditPartTracker.MAX_FLAG is a protected constant equals to
// SelectEditPartTracker.FLAG_ENABLE_DIRECT_EDIT (that must be originally used here).
performDirectEdit();
// The SelectEditPartTracker behavior is overridden here to never reveal the selected element.
// if (button == 1 && getSourceEditPart().getSelected() != EditPart.SELECTED_NONE)
// getCurrentViewer().reveal(getSourceEditPart());
setState(STATE_TERMINAL);
result = true;
}
// Clean up the mode to original state.
snapToAllShape = SnapToAllDragEditPartsTracker.DEFAULT_SNAP_TO_SHAPE_MODE;
return result;
}
@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();
}
@Override
protected void reveal(EditPart editpart) {
// In Sirius, the drag'n'drop can change (delete and create a new
// one) the previous container of the drag'n'droped element. In this
// case, the reveal causes a NPE because the hierarchy of edit part is
// broken.
if (editpart.getRoot() != null) {
super.reveal(editpart);
}
}
}
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