ColorFocusBorder.java 文件源码

/**
 * 绘制外发光阴影
 * 
 * @param canvas
 */
private void onDrawShadow(Canvas canvas)
{
    if (mShadowWidth > 0)
    {
        canvas.save();
        // 裁剪处理(使阴影矩形框内变为透明)
        if (mRoundRadius > 0)
        {
            canvas.clipRect(0, 0, getWidth(), getHeight());
            mTempRectF.set(mFrameRectF);
            mTempRectF.inset(mRoundRadius / 2f, mRoundRadius / 2f);
            canvas.clipRect(mTempRectF, Region.Op.DIFFERENCE);
        }
        // 绘制外发光阴影效果
        canvas.drawRoundRect(mFrameRectF, mRoundRadius, mRoundRadius, mShadowPaint);
        canvas.restore();
    }
}