RadialTimePickerView.java 文件源码

private void drawMinutes(Canvas canvas, Path selectorPath, float alphaMod) {
    final int minutesAlpha = (int) (255f * mHoursToMinutes * alphaMod + 0.5f);
    if (minutesAlpha > 0) {
        // Exclude the selector region, then draw minutes with no
        // activated states.
        canvas.save(Canvas.CLIP_SAVE_FLAG);
        canvas.clipPath(selectorPath, Region.Op.DIFFERENCE);
        drawMinutesClipped(canvas, minutesAlpha, false);
        canvas.restore();

        // Intersect the selector region, then draw minutes with only
        // activated states.
        canvas.save(Canvas.CLIP_SAVE_FLAG);
        canvas.clipPath(selectorPath, Region.Op.INTERSECT);
        drawMinutesClipped(canvas, minutesAlpha, true);
        canvas.restore();
    }
}