ClickShadowView.java 文件源码

/**
 * Aligns the shadow with {@param view}
 * @param viewParent immediate parent of {@param view}. It must be a sibling of this view.
 */
public void alignWithIconView(BubbleTextView view, ViewGroup viewParent, View clipAgainstView) {
    float leftShift = view.getLeft() + viewParent.getLeft() - getLeft();
    float topShift = view.getTop() + viewParent.getTop() - getTop();
    int iconWidth = view.getRight() - view.getLeft();
    int iconHeight = view.getBottom() - view.getTop();
    int iconHSpace = iconWidth - view.getCompoundPaddingRight() - view.getCompoundPaddingLeft();
    float drawableWidth = view.getIcon().getBounds().width();

    if (clipAgainstView != null) {
        // Set the bounds to clip against
        int[] coords = new int[] {0, 0};
        Utilities.getDescendantCoordRelativeToAncestor(clipAgainstView, (View) getParent(),
                coords, false);
        int clipLeft = (int) Math.max(0, coords[0] - leftShift - mShadowPadding);
        int clipTop = (int) Math.max(0, coords[1] - topShift - mShadowPadding) ;
        setClipBounds(new Rect(clipLeft, clipTop, clipLeft + iconWidth, clipTop + iconHeight));
    } else {
        // Reset the clip bounds
        setClipBounds(null);
    }

    setTranslationX(leftShift
            + viewParent.getTranslationX()
            + view.getCompoundPaddingLeft() * view.getScaleX()
            + (iconHSpace - drawableWidth) * view.getScaleX() / 2  /* drawable gap */
            + iconWidth * (1 - view.getScaleX()) / 2  /* gap due to scale */
            - mShadowPadding  /* extra shadow size */
            );
    setTranslationY(topShift
            + viewParent.getTranslationY()
            + view.getPaddingTop() * view.getScaleY()  /* drawable gap */
            + view.getHeight() * (1 - view.getScaleY()) / 2  /* gap due to scale */
            - mShadowPadding  /* extra shadow size */
            );
}