DownloadProgressButton.java 文件源码

private void drawProgressRectWithClip(Canvas canvas) {
    mPaint.setColor(mProgressBarColor);
    mPaint.setStyle(Paint.Style.FILL);
    //根据进度比率计算出当前的进度值对应的宽度
    int progress = (int) (mValidWidth * (getProgress() * 1.0f / getMax()));
    canvas.save();
    canvas.translate(getPaddingLeft(), getPaddingTop());
    //裁剪圆角矩形路径
    drawRoundRectPath();
    canvas.clipPath(mRoundRectPath);//裁剪之后此时画布就变成了裁剪之后的圆角矩形
    //裁剪进度路径
    drawProgressPath(progress);
    canvas.clipPath(mProgressPath, Region.Op.INTERSECT);
    canvas.drawColor(mProgressBarColor);
    canvas.restore();
}