private GraphicalViewer createRulerContainer(int orientation) {
ScrollingGraphicalViewer viewer = new RulerViewer();
final boolean isHorizontal =
orientation == PositionConstants.NORTH || orientation == PositionConstants.SOUTH;
// Finish initializing the viewer
viewer.setRootEditPart(new RulerRootEditPart(isHorizontal));
viewer.setEditPartFactory(new RulerEditPartFactory(diagramViewer));
viewer.createControl(this);
((GraphicalEditPart) viewer.getRootEditPart())
.getFigure()
.setBorder(new RulerBorder(isHorizontal));
viewer.setProperty(GraphicalViewer.class.toString(), diagramViewer);
// Configure the viewer's control
FigureCanvas canvas = (FigureCanvas) viewer.getControl();
canvas.setScrollBarVisibility(FigureCanvas.NEVER);
if (font == null) {
FontData[] data = canvas.getFont().getFontData();
for (int i = 0; i < data.length; i++) {
data[i].setHeight(data[i].getHeight() - 1);
}
font = new Font(Display.getCurrent(), data);
}
canvas.setFont(font);
if (isHorizontal) {
canvas.getViewport().setHorizontalRangeModel(editor.getViewport().getHorizontalRangeModel());
} else {
canvas.getViewport().setVerticalRangeModel(editor.getViewport().getVerticalRangeModel());
}
// Add the viewer to the rulerEditDomain
if (rulerEditDomain == null) {
rulerEditDomain = new EditDomain();
rulerEditDomain.setCommandStack(diagramViewer.getEditDomain().getCommandStack());
}
rulerEditDomain.addViewer(viewer);
return viewer;
}
private void disposeRulerViewer(GraphicalViewer viewer) {
if (viewer == null) return;
/*
* There's a tie from the editor's range model to the RulerViewport (via a listener)
* to the RulerRootEditPart to the RulerViewer. Break this tie so that the viewer
* doesn't leak and can be garbage collected.
*/
RangeModel rModel = new DefaultRangeModel();
Viewport port = ((FigureCanvas) viewer.getControl()).getViewport();
port.setHorizontalRangeModel(rModel);
port.setVerticalRangeModel(rModel);
rulerEditDomain.removeViewer(viewer);
viewer.getControl().dispose();
}