ForegroundLinearLayout.java 文件源码

public void draw(@NonNull Canvas canvas) {
    super.draw(canvas);
    if (this.mForeground != null) {
        Drawable foreground = this.mForeground;
        if (this.mForegroundBoundsChanged) {
            this.mForegroundBoundsChanged = false;
            Rect selfBounds = this.mSelfBounds;
            Rect overlayBounds = this.mOverlayBounds;
            int w = getRight() - getLeft();
            int h = getBottom() - getTop();
            if (this.mForegroundInPadding) {
                selfBounds.set(0, 0, w, h);
            } else {
                selfBounds.set(getPaddingLeft(), getPaddingTop(), w - getPaddingRight(), h - getPaddingBottom());
            }
            Gravity.apply(this.mForegroundGravity, foreground.getIntrinsicWidth(), foreground.getIntrinsicHeight(), selfBounds, overlayBounds);
            foreground.setBounds(overlayBounds);
        }
        foreground.draw(canvas);
    }
}