CircularRevealLayout.java 文件源码

public void reveal (float positionFromRight, int animationDuration) {
    View revealingView = circularRevealViewContainer.getChildAt(0);

    // start x-index for circular animation
    int cx = revealingView.getWidth() - (int) (positionFromRight);
    // start y-index for circular animation
    int cy = (revealingView.getTop() + revealingView.getBottom()) / 2;

    // calculate max radius
    int dx = Math.max(cx, revealingView.getWidth() - cx);
    int dy = Math.max(cy, revealingView.getHeight() - cy);
    float finalRadius = (float) Math.hypot(dx, dy);

    // Circular animation declaration begin
    final Animator animator;

    animator = io.codetail.animation.ViewAnimationUtils
            .createCircularReveal(revealingView, cx, cy, 0, finalRadius);
    animator.setInterpolator(new AccelerateDecelerateInterpolator());
    animator.setDuration(animationDuration);
    revealingView.setVisibility(View.VISIBLE);
    animator.start();
}