/**
* Updates this action's enabled state and tool tip text. This action is enabled only when there
* is a previous frame in the frame list. The tool tip text is "Back to " plus the tool tip text
* for the previous frame.
*/
public void update() {
super.update();
Frame previousFrame = getPreviousFrame();
setEnabled(previousFrame != null);
setToolTipText(getToolTipText(previousFrame));
}
/**
* Updates this action's enabled state. This action is enabled only when there is a frame for the
* current selection.
*/
@Override
public void update() {
super.update();
Frame selectionFrame = getSelectionFrame(0);
setEnabled(selectionFrame != null);
}
