Added RoundedRectRevealOutlineProvider.

/*

 * Copyright (C) 2017 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.android.launcher3.anim;

import android.graphics.Rect;

/**

 * A {@link RevealOutlineAnimation} that provides an outline that interpolates between two radii

 * and two {@link Rect}s.

 *

 * An example usage of this provider is an outline that starts out as a circle and ends

 * as a rounded rectangle.

 */

public class RoundedRectRevealOutlineProvider extends RevealOutlineAnimation {

    private final float mStartRadius;

    private final float mEndRadius;

    private final Rect mStartRect;

    private final Rect mEndRect;

    public RoundedRectRevealOutlineProvider(float startRadius, float endRadius, Rect startRect,

            Rect endRect) {

        mStartRadius = startRadius;

        mEndRadius = endRadius;

        mStartRect = startRect;

        mEndRect = endRect;

    }

    @Override

    public boolean shouldRemoveElevationDuringAnimation() {

        return false;

    }

    @Override

    public void setProgress(float progress) {

        mOutlineRadius = (1 - progress) * mStartRadius + progress * mEndRadius;

        mOutline.left = (int) ((1 - progress) * mStartRect.left + progress * mEndRect.left);

        mOutline.top = (int) ((1 - progress) * mStartRect.top + progress * mEndRect.top);

        mOutline.right = (int) ((1 - progress) * mStartRect.right + progress * mEndRect.right);

        mOutline.bottom = (int) ((1 - progress) * mStartRect.bottom + progress * mEndRect.bottom);

    }

}