chrome/android/features/tab_ui/java/src/org/chromium/chrome/browser/tasks/tab_management/TabListRecyclerView.java - chromium/src - Git at Google

 // Copyright 2019 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 package org.chromium.chrome.browser.tasks.tab_management;

 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
 import android.animation.ValueAnimator;
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.graphics.Rect;
 import android.os.SystemClock;
 import android.support.annotation.Nullable;
 import android.support.v7.widget.RecyclerView;
 import android.util.AttributeSet;
 import android.view.View;
 import android.view.ViewParent;

 import org.chromium.chrome.browser.ChromeFeatureList;
 import org.chromium.ui.interpolators.BakedBezierInterpolator;
 import org.chromium.ui.resources.dynamics.DynamicResourceLoader;
 import org.chromium.ui.resources.dynamics.ViewResourceAdapter;

 /**
  * A custom RecyclerView implementation for the tab grid, to handle show/hide logic in class.
  */
 class TabListRecyclerView extends RecyclerView {
     public static final long BASE_ANIMATION_DURATION_MS = 218;
     public static final long FINAL_FADE_IN_DURATION_MS = 50;
     public static final long RESTORE_ANIMATION_DURATION_MS = 10;
     public static final int ANIMATION_STATUS_RESTORE = 0;
     public static final int ANIMATION_STATUS_ZOOM_OUT = 1;
     public static final int ANIMATION_STATUS_ZOOM_IN = 2;

     /**
      * Field trial parameter for downsampling scaling factor.
      */
     private static final String DOWNSAMPLING_SCALE_PARAM = "downsampling-scale";

     private static final float DEFAULT_DOWNSAMPLING_SCALE = 0.5f;

     /**
      * An interface to listen to visibility related changes on this {@link RecyclerView}.
      */
     interface VisibilityListener {
         /**
          * Called before the animation to show the tab list has started.
          * @param isAnimating Whether visibility is changing with animation
          */
         void startedShowing(boolean isAnimating);

         /**
          * Called when the animation to show the tab list is finished.
          */
         void finishedShowing();

         /**
          * Called before the animation to hide the tab list has started.
          * @param isAnimating Whether visibility is changing with animation
          */
         void startedHiding(boolean isAnimating);

         /**
          * Called when the animation to show the tab list is finished.
          */
         void finishedHiding();
     }

     private ValueAnimator mFadeInAnimator;
     private ValueAnimator mFadeOutAnimator;
     private VisibilityListener mListener;
     private ViewResourceAdapter mDynamicView;
     private long mLastDirtyTime;
     private RecyclerView.ItemAnimator mOriginalAnimator;

     /**
      * Basic constructor to use during inflation from xml.
      */
     public TabListRecyclerView(Context context, AttributeSet attributeSet) {
         super(context, attributeSet);
     }

     /**
      * Set the {@link VisibilityListener} that will listen on granular visibility events.
      * @param listener The {@link VisibilityListener} to use.
      */
     void setVisibilityListener(VisibilityListener listener) {
         mListener = listener;
     }

     void prepareOverview() {
         endAllAnimations();

         // Stop all the animations to make all the items show up and scroll to position immediately.
         mOriginalAnimator = getItemAnimator();
         setItemAnimator(null);
     }

     /**
      * Start showing the tab list.
      * @param animate Whether the visibility change should be animated.
      */
     void startShowing(boolean animate) {
         assert mFadeOutAnimator == null;
         mListener.startedShowing(animate);

         long duration = ChromeFeatureList.isEnabled(ChromeFeatureList.TAB_TO_GTS_ANIMATION)
                 ? FINAL_FADE_IN_DURATION_MS
                 : BASE_ANIMATION_DURATION_MS;

         setAlpha(0);
         setVisibility(View.VISIBLE);
         mFadeInAnimator = ObjectAnimator.ofFloat(this, View.ALPHA, 1);
         mFadeInAnimator.setInterpolator(BakedBezierInterpolator.FADE_IN_CURVE);
         mFadeInAnimator.setDuration(duration);
         mFadeInAnimator.start();
         mFadeInAnimator.addListener(new AnimatorListenerAdapter() {
             @Override
             public void onAnimationEnd(Animator animation) {
                 mFadeInAnimator = null;
                 mListener.finishedShowing();
                 // Restore the original value.
                 setItemAnimator(mOriginalAnimator);

                 if (mDynamicView != null)
                     mDynamicView.dropCachedBitmap();
             }
         });
         if (!animate) mFadeInAnimator.end();
     }

     /**
      * @return The ID for registering and using the dynamic resource in compositor.
      */
     int getResourceId() {
         return getId();
     }

     long getLastDirtyTimeForTesting() {
         return mLastDirtyTime;
     }

     private float getDownsamplingScale() {
         String scale = ChromeFeatureList.getFieldTrialParamByFeature(
                 ChromeFeatureList.TAB_TO_GTS_ANIMATION, DOWNSAMPLING_SCALE_PARAM);
         try {
             return Float.valueOf(scale);
         } catch (NumberFormatException e) {
             return DEFAULT_DOWNSAMPLING_SCALE;
         }
     }

     /**
      * Create a DynamicResource for this RecyclerView.
      * The view resource can be obtained by {@link #getResourceId} in compositor layer.
      */
     void createDynamicView(DynamicResourceLoader loader) {
         mDynamicView = new ViewResourceAdapter(this) {
             @Override
             public boolean isDirty() {
                 boolean dirty = super.isDirty();
                 if (dirty) mLastDirtyTime = SystemClock.elapsedRealtime();
                 return dirty;
             }
         };
         mDynamicView.setDownsamplingScale(getDownsamplingScale());
         loader.registerResource(getResourceId(), mDynamicView);
     }

     @SuppressLint("NewApi") // Used on O+, invalidateChildInParent used for previous versions.
     @Override
     public void onDescendantInvalidated(View child, View target) {
         super.onDescendantInvalidated(child, target);
         if (mDynamicView != null) {
             mDynamicView.invalidate(null);
         }
     }

     @Override
     public ViewParent invalidateChildInParent(int[] location, Rect dirty) {
         ViewParent retVal = super.invalidateChildInParent(location, dirty);
         if (mDynamicView != null) {
             mDynamicView.invalidate(dirty);
         }
         return retVal;
     }

     /**
      * Start hiding the tab list.
      * @param animate Whether the visibility change should be animated.
      */
     void startHiding(boolean animate) {
         endAllAnimations();
         mListener.startedHiding(animate);
         mFadeOutAnimator = ObjectAnimator.ofFloat(this, View.ALPHA, 0);
         mFadeOutAnimator.setInterpolator(BakedBezierInterpolator.FADE_OUT_CURVE);
         mFadeOutAnimator.setDuration(BASE_ANIMATION_DURATION_MS);
         mFadeOutAnimator.addListener(new AnimatorListenerAdapter() {
             @Override
             public void onAnimationEnd(Animator animation) {
                 mFadeOutAnimator = null;
                 setVisibility(View.INVISIBLE);
                 mListener.finishedHiding();
             }
         });
         mFadeOutAnimator.start();
         if (!animate) mFadeOutAnimator.end();
     }

     void postHiding() {
         if (mDynamicView != null) {
             mDynamicView.dropCachedBitmap();
         }
     }

     private void endAllAnimations() {
         if (mFadeInAnimator != null) {
             mFadeInAnimator.end();
         }
         if (mFadeOutAnimator != null) {
             mFadeOutAnimator.end();
         }
     }

     /**
      * @param currentTabIndex The the current tab's index in the model.
      * @return The {@link Rect} of the thumbnail of the current tab, relative to the
      *         {@link TabListRecyclerView} coordinates.
      */
     @Nullable
     Rect getRectOfCurrentThumbnail(int currentTabIndex) {
         TabGridViewHolder holder =
                 (TabGridViewHolder) findViewHolderForAdapterPosition(currentTabIndex);
         if (holder == null) return null;

         int[] loc = new int[2];
         holder.thumbnail.getLocationInWindow(loc);
         Rect rect = new Rect(loc[0], loc[1], loc[0] + holder.thumbnail.getWidth(),
                 loc[1] + holder.thumbnail.getHeight());
         getLocationInWindow(loc);
         rect.top -= loc[1];
         rect.bottom -= loc[1];
         return rect;
     }

     static void scaleTabGridCardView(View view, int status) {
         AnimatorSet scaleAnimator = new AnimatorSet();
         float scale = status == ANIMATION_STATUS_ZOOM_IN ? 0.8f : 1f;
         ObjectAnimator scaleX = ObjectAnimator.ofFloat(view, "scaleX", scale);
         ObjectAnimator scaleY = ObjectAnimator.ofFloat(view, "scaleY", scale);
         scaleX.setDuration(status == ANIMATION_STATUS_RESTORE ? RESTORE_ANIMATION_DURATION_MS
                                                               : BASE_ANIMATION_DURATION_MS);
         scaleY.setDuration(status == ANIMATION_STATUS_RESTORE ? RESTORE_ANIMATION_DURATION_MS
                                                               : BASE_ANIMATION_DURATION_MS);
         scaleAnimator.play(scaleX).with(scaleY);
         scaleAnimator.start();
     }

     /**
      * This method finds out the index of the hovered tab's viewHolder in {@code recyclerView}.
      * @param recyclerView   The recyclerview that owns the tabs' viewHolders.
      * @param view           The view of the selected tab.
      * @param dX             The X offset of the selected tab.
      * @param dY             The Y offset of the selected tab.
      * @param threshold      The threshold to judge whether two tabs are overlapped.
      * @return The index of the hovered tab.
      */
     static int getHoveredTabIndex(
             RecyclerView recyclerView, View view, float dX, float dY, float threshold) {
         for (int i = 0; i < recyclerView.getChildCount(); i++) {
             View child = recyclerView.getChildAt(i);
             if (child.getLeft() == view.getLeft() && child.getTop() == view.getTop()) {
                 continue;
             }
             if (isOverlap(child.getLeft(), child.getTop(), view.getLeft() + dX, view.getTop() + dY,
                         threshold)) {
                 return i;
             }
         }
         return -1;
     }

     private static boolean isOverlap(
             float left1, float top1, float left2, float top2, float threshold) {
         return Math.abs(left1 - left2) < threshold && Math.abs(top1 - top2) < threshold;
     }
 }
	// Copyright 2019 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	package org.chromium.chrome.browser.tasks.tab_management;

	import android.animation.Animator;
	import android.animation.AnimatorListenerAdapter;
	import android.animation.AnimatorSet;
	import android.animation.ObjectAnimator;
	import android.animation.ValueAnimator;
	import android.annotation.SuppressLint;
	import android.content.Context;
	import android.graphics.Rect;
	import android.os.SystemClock;
	import android.support.annotation.Nullable;
	import android.support.v7.widget.RecyclerView;
	import android.util.AttributeSet;
	import android.view.View;
	import android.view.ViewParent;

	import org.chromium.chrome.browser.ChromeFeatureList;
	import org.chromium.ui.interpolators.BakedBezierInterpolator;
	import org.chromium.ui.resources.dynamics.DynamicResourceLoader;
	import org.chromium.ui.resources.dynamics.ViewResourceAdapter;

	/**
	* A custom RecyclerView implementation for the tab grid, to handle show/hide logic in class.
	*/
	class TabListRecyclerView extends RecyclerView {
	public static final long BASE_ANIMATION_DURATION_MS = 218;
	public static final long FINAL_FADE_IN_DURATION_MS = 50;
	public static final long RESTORE_ANIMATION_DURATION_MS = 10;
	public static final int ANIMATION_STATUS_RESTORE = 0;
	public static final int ANIMATION_STATUS_ZOOM_OUT = 1;
	public static final int ANIMATION_STATUS_ZOOM_IN = 2;

	/**
	* Field trial parameter for downsampling scaling factor.
	*/
	private static final String DOWNSAMPLING_SCALE_PARAM = "downsampling-scale";

	private static final float DEFAULT_DOWNSAMPLING_SCALE = 0.5f;

	/**
	* An interface to listen to visibility related changes on this {@link RecyclerView}.
	*/
	interface VisibilityListener {
	/**
	* Called before the animation to show the tab list has started.
	* @param isAnimating Whether visibility is changing with animation
	*/
	void startedShowing(boolean isAnimating);

	/**
	* Called when the animation to show the tab list is finished.
	*/
	void finishedShowing();

	/**
	* Called before the animation to hide the tab list has started.
	* @param isAnimating Whether visibility is changing with animation
	*/
	void startedHiding(boolean isAnimating);

	/**
	* Called when the animation to show the tab list is finished.
	*/
	void finishedHiding();
	}

	private ValueAnimator mFadeInAnimator;
	private ValueAnimator mFadeOutAnimator;
	private VisibilityListener mListener;
	private ViewResourceAdapter mDynamicView;
	private long mLastDirtyTime;
	private RecyclerView.ItemAnimator mOriginalAnimator;

	/**
	* Basic constructor to use during inflation from xml.
	*/
	public TabListRecyclerView(Context context, AttributeSet attributeSet) {
	super(context, attributeSet);
	}

	/**
	* Set the {@link VisibilityListener} that will listen on granular visibility events.
	* @param listener The {@link VisibilityListener} to use.
	*/
	void setVisibilityListener(VisibilityListener listener) {
	mListener = listener;
	}

	void prepareOverview() {
	endAllAnimations();

	// Stop all the animations to make all the items show up and scroll to position immediately.
	mOriginalAnimator = getItemAnimator();
	setItemAnimator(null);
	}

	/**
	* Start showing the tab list.
	* @param animate Whether the visibility change should be animated.
	*/
	void startShowing(boolean animate) {
	assert mFadeOutAnimator == null;
	mListener.startedShowing(animate);

	long duration = ChromeFeatureList.isEnabled(ChromeFeatureList.TAB_TO_GTS_ANIMATION)
	? FINAL_FADE_IN_DURATION_MS
	: BASE_ANIMATION_DURATION_MS;

	setAlpha(0);
	setVisibility(View.VISIBLE);
	mFadeInAnimator = ObjectAnimator.ofFloat(this, View.ALPHA, 1);
	mFadeInAnimator.setInterpolator(BakedBezierInterpolator.FADE_IN_CURVE);
	mFadeInAnimator.setDuration(duration);
	mFadeInAnimator.start();
	mFadeInAnimator.addListener(new AnimatorListenerAdapter() {
	@Override
	public void onAnimationEnd(Animator animation) {
	mFadeInAnimator = null;
	mListener.finishedShowing();
	// Restore the original value.
	setItemAnimator(mOriginalAnimator);

	if (mDynamicView != null)
	mDynamicView.dropCachedBitmap();
	}
	});
	if (!animate) mFadeInAnimator.end();
	}

	/**
	* @return The ID for registering and using the dynamic resource in compositor.
	*/
	int getResourceId() {
	return getId();
	}

	long getLastDirtyTimeForTesting() {
	return mLastDirtyTime;
	}

	private float getDownsamplingScale() {
	String scale = ChromeFeatureList.getFieldTrialParamByFeature(
	ChromeFeatureList.TAB_TO_GTS_ANIMATION, DOWNSAMPLING_SCALE_PARAM);
	try {
	return Float.valueOf(scale);
	} catch (NumberFormatException e) {
	return DEFAULT_DOWNSAMPLING_SCALE;
	}
	}

	/**
	* Create a DynamicResource for this RecyclerView.
	* The view resource can be obtained by {@link #getResourceId} in compositor layer.
	*/
	void createDynamicView(DynamicResourceLoader loader) {
	mDynamicView = new ViewResourceAdapter(this) {
	@Override
	public boolean isDirty() {
	boolean dirty = super.isDirty();
	if (dirty) mLastDirtyTime = SystemClock.elapsedRealtime();
	return dirty;
	}
	};
	mDynamicView.setDownsamplingScale(getDownsamplingScale());
	loader.registerResource(getResourceId(), mDynamicView);
	}

	@SuppressLint("NewApi") // Used on O+, invalidateChildInParent used for previous versions.
	@Override
	public void onDescendantInvalidated(View child, View target) {
	super.onDescendantInvalidated(child, target);
	if (mDynamicView != null) {
	mDynamicView.invalidate(null);
	}
	}

	@Override
	public ViewParent invalidateChildInParent(int[] location, Rect dirty) {
	ViewParent retVal = super.invalidateChildInParent(location, dirty);
	if (mDynamicView != null) {
	mDynamicView.invalidate(dirty);
	}
	return retVal;
	}

	/**
	* Start hiding the tab list.
	* @param animate Whether the visibility change should be animated.
	*/
	void startHiding(boolean animate) {
	endAllAnimations();
	mListener.startedHiding(animate);
	mFadeOutAnimator = ObjectAnimator.ofFloat(this, View.ALPHA, 0);
	mFadeOutAnimator.setInterpolator(BakedBezierInterpolator.FADE_OUT_CURVE);
	mFadeOutAnimator.setDuration(BASE_ANIMATION_DURATION_MS);
	mFadeOutAnimator.addListener(new AnimatorListenerAdapter() {
	@Override
	public void onAnimationEnd(Animator animation) {
	mFadeOutAnimator = null;
	setVisibility(View.INVISIBLE);
	mListener.finishedHiding();
	}
	});
	mFadeOutAnimator.start();
	if (!animate) mFadeOutAnimator.end();
	}

	void postHiding() {
	if (mDynamicView != null) {
	mDynamicView.dropCachedBitmap();
	}
	}

	private void endAllAnimations() {
	if (mFadeInAnimator != null) {
	mFadeInAnimator.end();
	}
	if (mFadeOutAnimator != null) {
	mFadeOutAnimator.end();
	}
	}

	/**
	* @param currentTabIndex The the current tab's index in the model.
	* @return The {@link Rect} of the thumbnail of the current tab, relative to the
	* {@link TabListRecyclerView} coordinates.
	*/
	@Nullable
	Rect getRectOfCurrentThumbnail(int currentTabIndex) {
	TabGridViewHolder holder =
	(TabGridViewHolder) findViewHolderForAdapterPosition(currentTabIndex);
	if (holder == null) return null;

	int[] loc = new int[2];
	holder.thumbnail.getLocationInWindow(loc);
	Rect rect = new Rect(loc[0], loc[1], loc[0] + holder.thumbnail.getWidth(),
	loc[1] + holder.thumbnail.getHeight());
	getLocationInWindow(loc);
	rect.top -= loc[1];
	rect.bottom -= loc[1];
	return rect;
	}

	static void scaleTabGridCardView(View view, int status) {
	AnimatorSet scaleAnimator = new AnimatorSet();
	float scale = status == ANIMATION_STATUS_ZOOM_IN ? 0.8f : 1f;
	ObjectAnimator scaleX = ObjectAnimator.ofFloat(view, "scaleX", scale);
	ObjectAnimator scaleY = ObjectAnimator.ofFloat(view, "scaleY", scale);
	scaleX.setDuration(status == ANIMATION_STATUS_RESTORE ? RESTORE_ANIMATION_DURATION_MS
	: BASE_ANIMATION_DURATION_MS);
	scaleY.setDuration(status == ANIMATION_STATUS_RESTORE ? RESTORE_ANIMATION_DURATION_MS
	: BASE_ANIMATION_DURATION_MS);
	scaleAnimator.play(scaleX).with(scaleY);
	scaleAnimator.start();
	}

	/**
	* This method finds out the index of the hovered tab's viewHolder in {@code recyclerView}.
	* @param recyclerView The recyclerview that owns the tabs' viewHolders.
	* @param view The view of the selected tab.
	* @param dX The X offset of the selected tab.
	* @param dY The Y offset of the selected tab.
	* @param threshold The threshold to judge whether two tabs are overlapped.
	* @return The index of the hovered tab.
	*/
	static int getHoveredTabIndex(
	RecyclerView recyclerView, View view, float dX, float dY, float threshold) {
	for (int i = 0; i < recyclerView.getChildCount(); i++) {
	View child = recyclerView.getChildAt(i);
	if (child.getLeft() == view.getLeft() && child.getTop() == view.getTop()) {
	continue;
	}
	if (isOverlap(child.getLeft(), child.getTop(), view.getLeft() + dX, view.getTop() + dY,
	threshold)) {
	return i;
	}
	}
	return -1;
	}

	private static boolean isOverlap(
	float left1, float top1, float left2, float top2, float threshold) {
	return Math.abs(left1 - left2) < threshold && Math.abs(top1 - top2) < threshold;
	}
	}