Merge "Color extracted gradient on Overview"

import android.animation.Animator;

import android.animation.ObjectAnimator;

import android.app.ActivityOptions.OnAnimationStartedListener;

import android.app.WallpaperManager;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import com.android.systemui.stackdivider.WindowManagerProxy;

import com.android.systemui.statusbar.FlingAnimationUtils;

import com.google.android.colorextraction.ColorExtractor;

import com.google.android.colorextraction.drawable.GradientDrawable;

import java.io.FileDescriptor;

import java.io.PrintWriter;

import java.util.ArrayList;

 * This view is the the top level layout that contains TaskStacks (which are laid out according

 * to their SpaceNode bounds.

 */

public class RecentsView extends FrameLayout {

public class RecentsView extends FrameLayout implements ColorExtractor.OnColorsChangedListener {

    private static final String TAG = "RecentsView";

    private static final int DEFAULT_UPDATE_SCRIM_DURATION = 200;

    private static final float DEFAULT_SCRIM_ALPHA = 0.33f;

    private static final float GRID_LAYOUT_SCRIM_ALPHA = 0.45f;

    private static final float DEFAULT_SCRIM_ALPHA = 0.8f;

    private static final int SHOW_STACK_ACTION_BUTTON_DURATION = 134;

    private static final int HIDE_STACK_ACTION_BUTTON_DURATION = 100;

    private int mDividerSize;

    private final float mScrimAlpha;

    private final Drawable mBackgroundScrim;

    private final GradientDrawable mBackgroundScrim;

    private final ColorExtractor mColorExtractor;

    private Animator mBackgroundScrimAnimator;

    private RecentsTransitionHelper mTransitionHelper;

        mDividerSize = ssp.getDockedDividerSize(context);

        mTouchHandler = new RecentsViewTouchHandler(this);

        mFlingAnimationUtils = new FlingAnimationUtils(context, 0.3f);

        mScrimAlpha = Recents.getConfiguration().isGridEnabled

                ? GRID_LAYOUT_SCRIM_ALPHA : DEFAULT_SCRIM_ALPHA;

        mBackgroundScrim = new ColorDrawable(

                Color.argb((int) (mScrimAlpha * 255), 0, 0, 0)).mutate();

        mScrimAlpha = DEFAULT_SCRIM_ALPHA;

        mBackgroundScrim = new GradientDrawable(context);

        mBackgroundScrim.setCallback(this);

        mBackgroundScrim.setAlpha((int) (mScrimAlpha * 255));

        mColorExtractor = new ColorExtractor(context);

        mColorExtractor.setListener(this);

        // We don't want to interpolate colors because we're defining the initial state.

        // Gradient should be set/ready when you open "Recents".

        mBackgroundScrim.setColors(mColorExtractor.getColors(WallpaperManager.FLAG_SYSTEM), false);

        LayoutInflater inflater = LayoutInflater.from(context);

        if (RecentsDebugFlags.Static.EnableStackActionButton) {

            // the tasks for the home animation.

            if (launchState.launchedViaDockGesture || launchState.launchedFromApp

                    || isTaskStackEmpty) {

                mBackgroundScrim.setAlpha(255);

                mBackgroundScrim.setAlpha((int) (mScrimAlpha * 255));

            } else {

                mBackgroundScrim.setAlpha(0);

            }

            mEmptyView.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);

        }

        // Needs to know the screen size since the gradient never scales up or down

        // even when bounds change.

        mBackgroundScrim.setScreenSize(right - left, bottom - top);

        mBackgroundScrim.setBounds(left, top, right, bottom);

        if (RecentsDebugFlags.Static.EnableStackActionButton) {

            // Layout the stack action button such that its drawable is start-aligned with the

            // stack, vertically centered in the available space above the stack

    private void animateBackgroundScrim(float alpha, int duration) {

        Utilities.cancelAnimationWithoutCallbacks(mBackgroundScrimAnimator);

        // Calculate the absolute alpha to animate from

        int fromAlpha = (int) ((mBackgroundScrim.getAlpha() / (mScrimAlpha * 255)) * 255);

        int toAlpha = (int) (alpha * 255);

        int fromAlpha = mBackgroundScrim.getAlpha();

        int toAlpha = (int) (alpha * mScrimAlpha * 255);

        mBackgroundScrimAnimator = ObjectAnimator.ofInt(mBackgroundScrim, Utilities.DRAWABLE_ALPHA,

                fromAlpha, toAlpha);

        mBackgroundScrimAnimator.setDuration(duration);

            mTaskStackView.dump(innerPrefix, writer);

        }

    }

    @Override

    public void onColorsChanged(ColorExtractor.GradientColors colors, int which) {

        if ((which & WallpaperManager.FLAG_SYSTEM) != 0) {

            mBackgroundScrim.setColors(colors);

        }

    }

}