void dispatchOnPanelStateChanged(View panel, PanelState previousState, PanelState newState) {
        synchronized (mPanelSlideListeners) {
            for (PanelSlideListener l : mPanelSlideListeners) {
                l.onPanelStateChanged(panel, previousState, newState);
            }
        }
        sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
    }
Check whether or not the main content is clipped to the top of the panel
app/src/main/java/home/smart/fly/animations/widget/slidepanel/SlidingUpPanelLayout.java