/**
* Sets the active layer of the track if the specified layer is one of the layers of the track.
* Sets the active layer to null if the specified parameter is null. Does nothing if the specified
* layer is not null and is not one of the layers of the track
*
* @param activeLayer the active layer to set
*/
public void setActiveLayer(Layer<?> activeLayer) {
Layer<?> oldLayer = getActiveLayer();
if (activeLayer == null) {
this.activeLayer = null;
} else if (layers.contains(activeLayer)) {
this.activeLayer = activeLayer;
}
// update the mouse listeners of the graphics panel
if (oldLayer != activeLayer) {
if (oldLayer != null) {
if (oldLayer instanceof MouseMotionListener) {
graphicsPanel.removeMouseMotionListener((MouseMotionListener) oldLayer);
}
if (oldLayer instanceof MouseListener) {
graphicsPanel.removeMouseListener((MouseListener) oldLayer);
}
if (oldLayer instanceof MouseWheelListener) {
graphicsPanel.removeMouseWheelListener((MouseWheelListener) oldLayer);
}
}
if (activeLayer != null) {
if (activeLayer instanceof MouseMotionListener) {
graphicsPanel.addMouseMotionListener((MouseMotionListener) activeLayer);
}
if (activeLayer instanceof MouseListener) {
graphicsPanel.addMouseListener((MouseListener) activeLayer);
}
if (activeLayer instanceof MouseWheelListener) {
graphicsPanel.addMouseWheelListener((MouseWheelListener) activeLayer);
}
}
}
}
@Override
public void intervalRemoved(ListDataEvent e) {
// case where the active layer was removed
if (!layers.contains(activeLayer)) {
setActiveLayer(null);
}
updateGraphicsPanelDrawers();
getScore().autorescaleScoreAxis();
}
@Override
public void contentsChanged(ListDataEvent e) {
// case where the active layer was removed
if (!layers.contains(activeLayer)) {
setActiveLayer(null);
}
if ((activeLayer == null) && !layers.isEmpty()) {
setActiveLayer(layers.getLayers()[0]);
}
updateGraphicsPanelDrawers();
getScore().autorescaleScoreAxis();
}