void saveState(Bundle state) {
        final boolean menuVisible = mDrawerState == STATE_OPEN || mDrawerState == STATE_OPENING;
        state.putBoolean(STATE_MENU_VISIBLE, menuVisible);
    }
Tests scrollability within child views of v given a delta of dx.

@param v      View to test for horizontal scrollability
@param checkV Whether the view should be checked for draggability
@param dx     Delta scrolled in pixels
@param x      X coordinate of the active touch point
@param y      Y coordinate of the active touch point
@return true if child views of v can be scrolled by delta of dx.
menudrawer/src/net/simonvt/menudrawer/DraggableDrawer.java