/**
* Creates rulers for the given graphical viewer.
*
* <p>The primaryViewer or its Control cannot be <code>null</code>. The primaryViewer's Control
* should be a FigureCanvas and a child of this Composite. This method should only be invoked
* once.
*
* <p>To create ruler(s), simply add the RulerProvider(s) (with the right key:
* RulerProvider.PROPERTY_HORIZONTAL_RULER or RulerProvider.PROPERTY_VERTICAL_RULER) as a property
* on the given viewer. It can be done after this method is invoked.
* RulerProvider.PROPERTY_RULER_VISIBILITY can be used to show/hide the rulers.
*
* @param primaryViewer The graphical viewer for which the rulers have to be created
*/
public void setGraphicalViewer(ScrollingGraphicalViewer primaryViewer) {
// pre-conditions
Assert.isNotNull(primaryViewer);
Assert.isNotNull(primaryViewer.getControl());
Assert.isTrue(diagramViewer == null);
diagramViewer = primaryViewer;
editor = (FigureCanvas) diagramViewer.getControl();
// layout whenever the scrollbars are shown or hidden, and whenever the RulerComposite
// is resized
layoutListener =
new Listener() {
public void handleEvent(Event event) {
// @TODO:Pratik If you use Display.asyncExec(runnable) here, some flashing
// occurs. You can see it when the palette is in the editor, and you hit
// the button to show/hide it.
layout(true);
}
};
addListener(SWT.Resize, layoutListener);
editor.getHorizontalBar().addListener(SWT.Show, layoutListener);
editor.getHorizontalBar().addListener(SWT.Hide, layoutListener);
editor.getVerticalBar().addListener(SWT.Show, layoutListener);
editor.getVerticalBar().addListener(SWT.Hide, layoutListener);
propertyListener =
new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent evt) {
String property = evt.getPropertyName();
if (RulerProvider.PROPERTY_HORIZONTAL_RULER.equals(property)) {
setRuler(
(RulerProvider)
diagramViewer.getProperty(RulerProvider.PROPERTY_HORIZONTAL_RULER),
PositionConstants.NORTH);
} else if (RulerProvider.PROPERTY_VERTICAL_RULER.equals(property)) {
setRuler(
(RulerProvider) diagramViewer.getProperty(RulerProvider.PROPERTY_VERTICAL_RULER),
PositionConstants.WEST);
} else if (RulerProvider.PROPERTY_RULER_VISIBILITY.equals(property))
setRulerVisibility(
((Boolean) diagramViewer.getProperty(RulerProvider.PROPERTY_RULER_VISIBILITY))
.booleanValue());
}
};
diagramViewer.addPropertyChangeListener(propertyListener);
Boolean rulerVisibility =
(Boolean) diagramViewer.getProperty(RulerProvider.PROPERTY_RULER_VISIBILITY);
if (rulerVisibility != null) setRulerVisibility(rulerVisibility.booleanValue());
setRuler(
(RulerProvider) diagramViewer.getProperty(RulerProvider.PROPERTY_HORIZONTAL_RULER),
PositionConstants.NORTH);
setRuler(
(RulerProvider) diagramViewer.getProperty(RulerProvider.PROPERTY_VERTICAL_RULER),
PositionConstants.WEST);
}
private void setRulerVisibility(boolean isVisible) {
if (isRulerVisible != isVisible) {
isRulerVisible = isVisible;
if (diagramViewer != null) {
setRuler(
(RulerProvider) diagramViewer.getProperty(RulerProvider.PROPERTY_HORIZONTAL_RULER),
PositionConstants.NORTH);
setRuler(
(RulerProvider) diagramViewer.getProperty(RulerProvider.PROPERTY_VERTICAL_RULER),
PositionConstants.WEST);
}
}
}