/**
* Register itself at the given event source.
*
* @param eventSource The emitter of the mouse events.
* @param lassoMode {@code true} to enable lasso mode, {@code false} to disable it.
*/
public void register(NavigatableComponent eventSource, boolean lassoMode) {
this.lassoMode = lassoMode;
eventSource.addMouseListener(this);
eventSource.addMouseMotionListener(this);
selectionEndedListener.addPropertyChangeListener(this);
eventSource.addPropertyChangeListener(
"scale",
new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
if (mousePosStart != null) {
paintRect();
mousePos = mousePosStart = null;
}
}
});
}
/** Check the state of the keys and buttons and set the selection accordingly. */
@Override
public void mouseReleased(MouseEvent e) {
if (e.getButton() != MouseEvent.BUTTON1) return;
if (mousePos == null || mousePosStart == null) return; // injected release from outside
// disable the selection rect
Rectangle r;
if (!lassoMode) {
nc.requestClearRect();
r = getSelectionRectangle();
lasso = rectToPolygon(r);
} else {
nc.requestClearPoly();
lasso.addPoint(mousePos.x, mousePos.y);
r = lasso.getBounds();
}
mousePosStart = null;
mousePos = null;
if ((e.getModifiersEx() & MouseEvent.BUTTON3_DOWN_MASK) == 0) {
selectionEndedListener.selectionEnded(r, e);
}
}
/**
* Unregister itself from the given event source. If a selection rectangle is shown, hide it
* first.
*
* @param eventSource The emitter of the mouse events.
*/
public void unregister(Component eventSource) {
eventSource.removeMouseListener(this);
eventSource.removeMouseMotionListener(this);
selectionEndedListener.removePropertyChangeListener(this);
}
