HBButton.java 文件源码

private Animation generateLineLTRAnimation(final RectF rectF, long offset) {

        final float currentLeft = rectF.left;
        final float currentRight = rectF.right;

        Animation animation = new Animation() {
            @Override
            protected void applyTransformation(float interpolatedTime, Transformation t) {
                super.applyTransformation(interpolatedTime, t);
                if (getCurrentState() == HBButtonState.NORMAL) {
                    rectF.set(rectF.left, rectF.top, currentRight - (currentRight - currentLeft) / 2 * interpolatedTime, rectF.bottom);
                } else {
                    rectF.set(rectF.left, rectF.top, currentRight + (currentRight - currentLeft) * interpolatedTime, rectF.bottom);
                }
                invalidate();
            }
        };
        animation.setDuration(getAnimationDuration());
        animation.setStartOffset(offset);
        return animation;
    }