src/com/android/launcher3/LauncherAppTransitionManager.java

/*
 * Copyright (C) 2018 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;


import android.app.ActivityOptions;
import android.content.Context;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.view.View;

import com.android.launcher3.util.ResourceBasedOverride;

/**
 * Manages the opening and closing app transitions from Launcher.
 */
public class LauncherAppTransitionManager implements ResourceBasedOverride {

    public static LauncherAppTransitionManager newInstance(Context context) {
        return Overrides.getObject(LauncherAppTransitionManager.class,
                context, R.string.app_transition_manager_class);
    }

    public ActivityOptions getActivityLaunchOptions(Launcher launcher, View v) {
        if (Utilities.ATLEAST_MARSHMALLOW) {
            int left = 0, top = 0;
            int width = v.getMeasuredWidth(), height = v.getMeasuredHeight();
            if (v instanceof BubbleTextView) {
                // Launch from center of icon, not entire view
                Drawable icon = ((BubbleTextView) v).getIcon();
                if (icon != null) {
                    Rect bounds = icon.getBounds();
                    left = (width - bounds.width()) / 2;
                    top = v.getPaddingTop();
                    width = bounds.width();
                    height = bounds.height();
                }
            }
            return ActivityOptions.makeClipRevealAnimation(v, left, top, width, height);
        } else if (Utilities.ATLEAST_LOLLIPOP_MR1) {
            // On L devices, we use the device default slide-up transition.
            // On L MR1 devices, we use a custom version of the slide-up transition which
            // doesn't have the delay present in the device default.
            return ActivityOptions.makeCustomAnimation(launcher, R.anim.task_open_enter,
                    R.anim.no_anim);
        }
        return null;
    }
}