quickstep/src/com/android/launcher3/uioverrides/RecentsViewStateController.java

/*
 * 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.uioverrides;

import static com.android.launcher3.LauncherAnimUtils.SCALE_PROPERTY;
import static com.android.launcher3.LauncherState.FAST_OVERVIEW;
import static com.android.launcher3.LauncherState.OVERVIEW;
import static com.android.launcher3.anim.AnimatorSetBuilder.ANIM_OVERVIEW_FADE;
import static com.android.launcher3.anim.AnimatorSetBuilder.ANIM_OVERVIEW_SCALE;
import static com.android.launcher3.anim.Interpolators.AGGRESSIVE_EASE_IN_OUT;
import static com.android.launcher3.anim.Interpolators.LINEAR;
import static com.android.quickstep.QuickScrubController.QUICK_SCRUB_START_INTERPOLATOR;
import static com.android.quickstep.QuickScrubController.QUICK_SCRUB_TRANSLATION_Y_FACTOR;
import static com.android.quickstep.views.LauncherRecentsView.TRANSLATION_Y_FACTOR;
import static com.android.quickstep.views.RecentsViewContainer.CONTENT_ALPHA;

import android.animation.ValueAnimator;
import android.annotation.TargetApi;
import android.os.Build;
import android.view.animation.Interpolator;

import com.android.launcher3.Launcher;
import com.android.launcher3.LauncherState;
import com.android.launcher3.LauncherStateManager.AnimationConfig;
import com.android.launcher3.LauncherStateManager.StateHandler;
import com.android.launcher3.anim.AnimatorSetBuilder;
import com.android.launcher3.anim.Interpolators;
import com.android.launcher3.anim.PropertySetter;
import com.android.quickstep.views.LauncherRecentsView;
import com.android.quickstep.views.RecentsViewContainer;

@TargetApi(Build.VERSION_CODES.O)
public class RecentsViewStateController implements StateHandler {

    private final Launcher mLauncher;
    private final LauncherRecentsView mRecentsView;
    private final RecentsViewContainer mRecentsViewContainer;

    public RecentsViewStateController(Launcher launcher) {
        mLauncher = launcher;
        mRecentsView = launcher.getOverviewPanel();
        mRecentsViewContainer = launcher.getOverviewPanelContainer();
    }

    @Override
    public void setState(LauncherState state) {
        mRecentsViewContainer.setContentAlpha(state.overviewUi ? 1 : 0);
        float[] scaleTranslationYFactor = state.getOverviewScaleAndTranslationYFactor(mLauncher);
        SCALE_PROPERTY.set(mRecentsView, scaleTranslationYFactor[0]);
        mRecentsView.setTranslationYFactor(scaleTranslationYFactor[1]);
        if (state.overviewUi) {
            mRecentsView.updateEmptyMessage();
            mRecentsView.resetTaskVisuals();
        }
    }

    @Override
    public void setStateWithAnimation(final LauncherState toState,
            AnimatorSetBuilder builder, AnimationConfig config) {
        if (!config.playAtomicComponent()) {
            // The entire recents animation is played atomically.
            return;
        }
        PropertySetter setter = config.getPropertySetter(builder);
        float[] scaleTranslationYFactor = toState.getOverviewScaleAndTranslationYFactor(mLauncher);
        Interpolator scaleAndTransYInterpolator = builder.getInterpolator(
                ANIM_OVERVIEW_SCALE, LINEAR);
        if (mLauncher.getStateManager().getState() == OVERVIEW && toState == FAST_OVERVIEW) {
            scaleAndTransYInterpolator = Interpolators.clampToProgress(
                    QUICK_SCRUB_START_INTERPOLATOR, 0, QUICK_SCRUB_TRANSLATION_Y_FACTOR);
        }
        setter.setFloat(mRecentsView, SCALE_PROPERTY, scaleTranslationYFactor[0],
                scaleAndTransYInterpolator);
        setter.setFloat(mRecentsView, TRANSLATION_Y_FACTOR, scaleTranslationYFactor[1],
                scaleAndTransYInterpolator);
        setter.setFloat(mRecentsViewContainer, CONTENT_ALPHA, toState.overviewUi ? 1 : 0,
                builder.getInterpolator(ANIM_OVERVIEW_FADE, AGGRESSIVE_EASE_IN_OUT));

        if (!toState.overviewUi) {
            builder.addOnFinishRunnable(mRecentsView::resetTaskVisuals);
        }

        if (toState.overviewUi) {
            ValueAnimator updateAnim = ValueAnimator.ofFloat(0, 1);
            updateAnim.addUpdateListener(valueAnimator -> {
                // While animating into recents, update the visible task data as needed
                mRecentsView.loadVisibleTaskData();
            });
            updateAnim.setDuration(config.duration);
            builder.play(updateAnim);
            mRecentsView.updateEmptyMessage();
        }
    }
}