int height = getHeight();
int horizontalSpacing = (int) (width * SPACING_RATIO);
int verticalSpacing = (int) (height * SPACING_RATIO);
Rect gripperArea = Rect.createWithMeasures(0, 0, gripperAreaWidth, height);
Rect backgroundArea = Rect.create(gripperAreaWidth, 0, width, height);
Rect graphicArea = Rect.create(backgroundArea.getLeft() + horizontalSpacing,
verticalSpacing, width - horizontalSpacing, height - verticalSpacing);
manager.updateRegions(gripperArea, backgroundArea, graphicArea);
}