SlidingPaneLayout.java 文件源码

private void dimChildView(View v, float mag, int fadeColor) {
    LayoutParams lp = (LayoutParams) v.getLayoutParams();
    if (mag > 0.0f && fadeColor != 0) {
        int color = (((int) (((float) ((-16777216 & fadeColor) >>> 24)) * mag)) << 24) | (ViewCompat.MEASURED_SIZE_MASK & fadeColor);
        if (lp.dimPaint == null) {
            lp.dimPaint = new Paint();
        }
        lp.dimPaint.setColorFilter(new PorterDuffColorFilter(color, Mode.SRC_OVER));
        if (ViewCompat.getLayerType(v) != 2) {
            ViewCompat.setLayerType(v, 2, lp.dimPaint);
        }
        invalidateChildRegion(v);
    } else if (ViewCompat.getLayerType(v) != 0) {
        if (lp.dimPaint != null) {
            lp.dimPaint.setColorFilter(null);
        }
        DisableLayerRunnable dlr = new DisableLayerRunnable(v);
        this.mPostedRunnables.add(dlr);
        ViewCompat.postOnAnimation(this, dlr);
    }
}