Merge "Deletes SysuiLifecycle." into tm-qpr-dev am: cb0d0ff8

/*

 * 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.systemui.util;

import static androidx.lifecycle.Lifecycle.State.DESTROYED;

import static androidx.lifecycle.Lifecycle.State.RESUMED;

import android.view.View;

import android.view.View.OnAttachStateChangeListener;

import androidx.annotation.NonNull;

import androidx.lifecycle.Lifecycle;

import androidx.lifecycle.LifecycleOwner;

import androidx.lifecycle.LifecycleRegistry;

/**

 * Tools for generating lifecycle from sysui objects.

 */

public class SysuiLifecycle {

    private SysuiLifecycle() {

    }

    /**

     * Get a lifecycle that will be put into the resumed state when the view is attached

     * and goes to the destroyed state when the view is detached.

     */

    public static LifecycleOwner viewAttachLifecycle(View v) {

        return new ViewLifecycle(v);

    }

    private static class ViewLifecycle implements LifecycleOwner, OnAttachStateChangeListener {

        private final LifecycleRegistry mLifecycle = new LifecycleRegistry(this);

        ViewLifecycle(View v) {

            v.addOnAttachStateChangeListener(this);

            if (v.isAttachedToWindow()) {

                mLifecycle.markState(RESUMED);

            }

        }

        @NonNull

        @Override

        public Lifecycle getLifecycle() {

            return mLifecycle;

        }

        @Override

        public void onViewAttachedToWindow(View v) {

            mLifecycle.markState(RESUMED);

        }

        @Override

        public void onViewDetachedFromWindow(View v) {

            mLifecycle.markState(DESTROYED);

        }

    }

}

/*

 * 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.systemui.util;

import static androidx.lifecycle.Lifecycle.Event.ON_CREATE;

import static androidx.lifecycle.Lifecycle.Event.ON_DESTROY;

import static androidx.lifecycle.Lifecycle.Event.ON_PAUSE;

import static androidx.lifecycle.Lifecycle.Event.ON_RESUME;

import static androidx.lifecycle.Lifecycle.Event.ON_START;

import static androidx.lifecycle.Lifecycle.Event.ON_STOP;

import static com.android.systemui.util.SysuiLifecycle.viewAttachLifecycle;

import static com.google.common.truth.Truth.assertThat;

import static org.mockito.ArgumentMatchers.eq;

import static org.mockito.Mockito.mock;

import static org.mockito.Mockito.verify;

import android.testing.AndroidTestingRunner;

import android.testing.TestableLooper;

import android.testing.TestableLooper.RunWithLooper;

import android.testing.ViewUtils;

import android.view.View;

import androidx.lifecycle.Lifecycle;

import androidx.lifecycle.LifecycleEventObserver;

import androidx.lifecycle.LifecycleOwner;

import androidx.test.filters.SmallTest;

import com.android.systemui.SysuiTestCase;

import org.junit.After;

import org.junit.Before;

import org.junit.Test;

import org.junit.runner.RunWith;

@RunWithLooper(setAsMainLooper = true)

@RunWith(AndroidTestingRunner.class)

@SmallTest

public class SysuiLifecycleTest extends SysuiTestCase {

    private View mView;

    @Before

    public void setUp() {

        mView = new View(mContext);

    }

    @After

    public void tearDown() {

        if (mView.isAttachedToWindow()) {

            ViewUtils.detachView(mView);

            TestableLooper.get(this).processAllMessages();

        }

    }

    @Test

    public void testAttach() {

        LifecycleEventObserver observer = mock(LifecycleEventObserver.class);

        LifecycleOwner lifecycle = viewAttachLifecycle(mView);

        lifecycle.getLifecycle().addObserver(observer);

        ViewUtils.attachView(mView);

        TestableLooper.get(this).processAllMessages();

        verify(observer).onStateChanged(eq(lifecycle), eq(ON_CREATE));

        verify(observer).onStateChanged(eq(lifecycle), eq(ON_START));

        verify(observer).onStateChanged(eq(lifecycle), eq(ON_RESUME));

    }

    @Test

    public void testDetach() {

        LifecycleEventObserver observer = mock(LifecycleEventObserver.class);

        LifecycleOwner lifecycle = viewAttachLifecycle(mView);

        lifecycle.getLifecycle().addObserver(observer);

        ViewUtils.attachView(mView);

        TestableLooper.get(this).processAllMessages();

        ViewUtils.detachView(mView);

        TestableLooper.get(this).processAllMessages();

        verify(observer).onStateChanged(eq(lifecycle), eq(ON_PAUSE));

        verify(observer).onStateChanged(eq(lifecycle), eq(ON_STOP));

        verify(observer).onStateChanged(eq(lifecycle), eq(ON_DESTROY));

    }

    @Test

    public void testStateBeforeAttach() {

        // WHEN a lifecycle is obtained from a view

        LifecycleOwner lifecycle = viewAttachLifecycle(mView);

        // THEN the lifecycle state should be INITIAZED

        assertThat(lifecycle.getLifecycle().getCurrentState()).isEqualTo(

                Lifecycle.State.INITIALIZED);

    }

    @Test

    public void testStateAfterAttach() {

        // WHEN a lifecycle is obtained from a view

        LifecycleOwner lifecycle = viewAttachLifecycle(mView);

        // AND the view is attached

        ViewUtils.attachView(mView);

        TestableLooper.get(this).processAllMessages();

        // THEN the lifecycle state should be RESUMED

        assertThat(lifecycle.getLifecycle().getCurrentState()).isEqualTo(Lifecycle.State.RESUMED);

    }

    @Test

    public void testStateAfterDetach() {

        // WHEN a lifecycle is obtained from a view

        LifecycleOwner lifecycle = viewAttachLifecycle(mView);

        // AND the view is detached

        ViewUtils.attachView(mView);

        TestableLooper.get(this).processAllMessages();

        ViewUtils.detachView(mView);

        TestableLooper.get(this).processAllMessages();

        // THEN the lifecycle state should be DESTROYED

        assertThat(lifecycle.getLifecycle().getCurrentState()).isEqualTo(Lifecycle.State.DESTROYED);

    }

    @Test

    public void testStateAfterReattach() {

        // WHEN a lifecycle is obtained from a view

        LifecycleOwner lifecycle = viewAttachLifecycle(mView);

        // AND the view is re-attached

        ViewUtils.attachView(mView);

        TestableLooper.get(this).processAllMessages();

        ViewUtils.detachView(mView);

        TestableLooper.get(this).processAllMessages();

        ViewUtils.attachView(mView);

        TestableLooper.get(this).processAllMessages();

        // THEN the lifecycle state should still be DESTROYED, err RESUMED?

        assertThat(lifecycle.getLifecycle().getCurrentState()).isEqualTo(Lifecycle.State.RESUMED);

    }

    @Test

    public void testStateWhenViewAlreadyAttached() {

        // GIVEN that a view is already attached

        ViewUtils.attachView(mView);

        TestableLooper.get(this).processAllMessages();

        // WHEN a lifecycle is obtained from a view

        LifecycleOwner lifecycle = viewAttachLifecycle(mView);

        // THEN the lifecycle state should be RESUMED

        assertThat(lifecycle.getLifecycle().getCurrentState()).isEqualTo(Lifecycle.State.RESUMED);

    }

    @Test

    public void testStateWhenViewAlreadyDetached() {

        // GIVEN that a view is already detached

        ViewUtils.attachView(mView);

        TestableLooper.get(this).processAllMessages();

        ViewUtils.detachView(mView);

        TestableLooper.get(this).processAllMessages();

        // WHEN a lifecycle is obtained from a view

        LifecycleOwner lifecycle = viewAttachLifecycle(mView);

        // THEN the lifecycle state should be INITIALIZED

        assertThat(lifecycle.getLifecycle().getCurrentState()).isEqualTo(

                Lifecycle.State.INITIALIZED);

    }

}