@Override
public void mouseDown(MouseEvent e, EditPartViewer viewer) {
if (viewer.getContents() instanceof ERDiagramEditPart) {
ERDiagramEditPart editPart = (ERDiagramEditPart) viewer.getContents();
ERDiagram diagram = (ERDiagram) editPart.getModel();
diagram.mousePoint = new Point(e.x, e.y);
editPart.getFigure().translateToRelative(diagram.mousePoint);
}
super.mouseDown(e, viewer);
}
/**
* Computes actual grid specification (origin + single cell width and height) in the absolute
* coordinate system. Note, in contrast to {@link #getRelativeGridSpec(EditPartViewer)} this
* specification depends on the active zoom or scroll and can't be cached by clients.
*
* @param viewer
* @return absolute grid specification, or <code>null</code> if grid is not enabled
*/
public static PrecisionRectangle getAbsoluteGridSpec(EditPartViewer viewer) {
PrecisionRectangle spec = getRelativeGridSpec(viewer);
if (spec != null) {
GraphicalEditPart diagramEP = (GraphicalEditPart) viewer.getContents();
diagramEP.getContentPane().translateToAbsolute(spec);
}
return spec;
}
/**
* Always returns the same instance to avoid endless creation
*
* @return active grid specification in absolute coordinates or <code>null</code> if not enabled
*/
public PrecisionRectangle getAbsoluteGridSpec() {
PrecisionRectangle result = getRelativeGridSpec();
if (result == null) {
return null;
}
if (myAbsoluteGridSpec == null) {
myAbsoluteGridSpec = new PrecisionRectangle();
}
myAbsoluteGridSpec.setPreciseBounds(
result.preciseX(), result.preciseY(), result.preciseWidth(), result.preciseHeight());
GraphicalEditPart diagramEP = (GraphicalEditPart) myViewer.getContents();
diagramEP.getContentPane().translateToAbsolute(myAbsoluteGridSpec);
return myAbsoluteGridSpec;
}