src/com/android/launcher3/dragndrop/DragView.java - LeafOS-Project/android_packages_apps_Launcher3 - Gitiles

 /*
  * Copyright (C) 2008 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.dragndrop;

 import static android.view.View.MeasureSpec.EXACTLY;
 import static android.view.View.MeasureSpec.makeMeasureSpec;

 import static com.android.launcher3.LauncherAnimUtils.VIEW_ALPHA;
 import static com.android.launcher3.icons.FastBitmapDrawable.getDisabledColorFilter;
 import static com.android.launcher3.util.Executors.MODEL_EXECUTOR;

 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
 import android.animation.ValueAnimator;
 import android.animation.ValueAnimator.AnimatorUpdateListener;
 import android.annotation.TargetApi;
 import android.content.Context;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.ColorFilter;
 import android.graphics.Path;
 import android.graphics.Picture;
 import android.graphics.Rect;
 import android.graphics.drawable.AdaptiveIconDrawable;
 import android.graphics.drawable.ColorDrawable;
 import android.graphics.drawable.Drawable;
 import android.graphics.drawable.PictureDrawable;
 import android.os.Build;
 import android.os.Handler;
 import android.os.Looper;
 import android.util.Pair;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
 import android.widget.ImageView;

 import androidx.annotation.Nullable;
 import androidx.dynamicanimation.animation.FloatPropertyCompat;
 import androidx.dynamicanimation.animation.SpringAnimation;
 import androidx.dynamicanimation.animation.SpringForce;

 import com.android.app.animation.Interpolators;
 import com.android.launcher3.R;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.icons.FastBitmapDrawable;
 import com.android.launcher3.icons.LauncherIcons;
 import com.android.launcher3.model.data.ItemInfo;
 import com.android.launcher3.util.RunnableList;
 import com.android.launcher3.views.ActivityContext;
 import com.android.launcher3.views.BaseDragLayer;

 /** A custom view for rendering an icon, folder, shortcut or widget during drag-n-drop. */
 public abstract class DragView<T extends Context & ActivityContext> extends FrameLayout {

     public static final int VIEW_ZOOM_DURATION = 150;

     private final View mContent;
     // The following are only used for rendering mContent directly during drag-n-drop.
     @Nullable private ViewGroup.LayoutParams mContentViewLayoutParams;
     @Nullable private ViewGroup mContentViewParent;
     private int mContentViewInParentViewIndex = -1;
     private final int mWidth;
     private final int mHeight;

     private final int mBlurSizeOutline;
     protected final int mRegistrationX;
     protected final int mRegistrationY;
     private final float mInitialScale;
     private final float mEndScale;
     protected final float mScaleOnDrop;
     protected final int[] mTempLoc = new int[2];

     private final RunnableList mOnDragStartCallback = new RunnableList();

     private boolean mHasDragOffset;
     private Rect mDragRegion = null;
     protected final T mActivity;
     private final BaseDragLayer<T> mDragLayer;
     private boolean mHasDrawn = false;

     final ValueAnimator mScaleAnim;
     final ValueAnimator mShiftAnim;

     // Whether mAnim has started. Unlike mAnim.isStarted(), this is true even after mAnim ends.
     private boolean mScaleAnimStarted;
     private boolean mShiftAnimStarted;
     private Runnable mOnScaleAnimEndCallback;
     private Runnable mOnShiftAnimEndCallback;

     private int mLastTouchX;
     private int mLastTouchY;
     private int mAnimatedShiftX;
     private int mAnimatedShiftY;

     // Below variable only needed IF FeatureFlags.LAUNCHER3_SPRING_ICONS is {@code true}
     private Drawable mBgSpringDrawable, mFgSpringDrawable;
     private SpringFloatValue mTranslateX, mTranslateY;
     private Path mScaledMaskPath;
     private Drawable mBadge;

     public DragView(T launcher, Drawable drawable, int registrationX,
             int registrationY, final float initialScale, final float scaleOnDrop,
             final float finalScaleDps) {
         this(launcher, getViewFromDrawable(launcher, drawable),
                 drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(),
                 registrationX, registrationY, initialScale, scaleOnDrop, finalScaleDps);
     }

     /**
      * Construct the drag view.
      * <p>
      * The registration point is the point inside our view that the touch events should
      * be centered upon.
      * @param activity The Launcher instance/ActivityContext this DragView is in.
      * @param content the view content that is attached to the drag view.
      * @param width the width of the dragView
      * @param height the height of the dragView
      * @param initialScale The view that we're dragging around.  We scale it up when we draw it.
      * @param registrationX The x coordinate of the registration point.
      * @param registrationY The y coordinate of the registration point.
      * @param scaleOnDrop the scale used in the drop animation.
      * @param finalScaleDps the scale used in the zoom out animation when the drag view is shown.
      */
     public DragView(T activity, View content, int width, int height, int registrationX,
             int registrationY, final float initialScale, final float scaleOnDrop,
             final float finalScaleDps) {
         super(activity);
         mActivity = activity;
         mDragLayer = activity.getDragLayer();

         mContent = content;
         mWidth = width;
         mHeight = height;
         mContentViewLayoutParams = mContent.getLayoutParams();
         if (mContent.getParent() instanceof ViewGroup) {
             mContentViewParent = (ViewGroup) mContent.getParent();
             mContentViewInParentViewIndex = mContentViewParent.indexOfChild(mContent);
             mContentViewParent.removeView(mContent);
         }

         addView(content, new LayoutParams(width, height));

         // If there is already a scale set on the content, we don't want to clip the children.
         if (content.getScaleX() != 1 || content.getScaleY() != 1) {
             setClipChildren(false);
             setClipToPadding(false);
         }

         mEndScale = (width + finalScaleDps) / width;

         // Set the initial scale to avoid any jumps
         setScaleX(initialScale);
         setScaleY(initialScale);

         // Animate the view into the correct position
         mScaleAnim = ValueAnimator.ofFloat(0f, 1f);
         mScaleAnim.setDuration(VIEW_ZOOM_DURATION);
         mScaleAnim.addUpdateListener(animation -> {
             final float value = (Float) animation.getAnimatedValue();
             setScaleX(Utilities.mapRange(value, initialScale, mEndScale));
             setScaleY(Utilities.mapRange(value, initialScale, mEndScale));
             if (!isAttachedToWindow()) {
                 animation.cancel();
             }
         });
         mScaleAnim.addListener(new AnimatorListenerAdapter() {
             @Override
             public void onAnimationStart(Animator animation) {
                 mScaleAnimStarted = true;
             }

             @Override
             public void onAnimationEnd(Animator animation) {
                 super.onAnimationEnd(animation);
                 if (mOnScaleAnimEndCallback != null) {
                     mOnScaleAnimEndCallback.run();
                 }
             }
         });
         // Set up the shift animator.
         mShiftAnim = ValueAnimator.ofFloat(0f, 1f);
         mShiftAnim.addListener(new AnimatorListenerAdapter() {
             @Override
             public void onAnimationStart(Animator animation) {
                 mShiftAnimStarted = true;
             }

             @Override
             public void onAnimationEnd(Animator animation) {
                 if (mOnShiftAnimEndCallback != null) {
                     mOnShiftAnimEndCallback.run();
                 }
             }
         });

         setDragRegion(new Rect(0, 0, width, height));

         // The point in our scaled bitmap that the touch events are located
         mRegistrationX = registrationX;
         mRegistrationY = registrationY;

         mInitialScale = initialScale;
         mScaleOnDrop = scaleOnDrop;

         // Force a measure, because Workspace uses getMeasuredHeight() before the layout pass
         measure(makeMeasureSpec(width, EXACTLY), makeMeasureSpec(height, EXACTLY));

         mBlurSizeOutline = getResources().getDimensionPixelSize(R.dimen.blur_size_medium_outline);
         setElevation(getResources().getDimension(R.dimen.drag_elevation));
         setWillNotDraw(false);
     }

     /** Callback invoked when the scale animation ends. */
     public void setOnScaleAnimEndCallback(Runnable callback) {
         mOnScaleAnimEndCallback = callback;
     }

     /** Callback invoked when the shift animation ends. */
     public void setOnShiftAnimEndCallback(Runnable callback) {
         mOnShiftAnimEndCallback = callback;
     }

     /**
      * Initialize {@code #mIconDrawable} if the item can be represented using
      * an {@link AdaptiveIconDrawable} or {@link FolderAdaptiveIcon}.
      */
     @TargetApi(Build.VERSION_CODES.O)
     public void setItemInfo(final ItemInfo info) {
         // Load the adaptive icon on a background thread and add the view in ui thread.
         MODEL_EXECUTOR.getHandler().postAtFrontOfQueue(() -> {
             int w = mWidth;
             int h = mHeight;
             Pair<AdaptiveIconDrawable, Drawable> fullDrawable = Utilities.getFullDrawable(
                     mActivity, info, w, h, true /* shouldThemeIcon */);
             if (fullDrawable != null) {
                 AdaptiveIconDrawable adaptiveIcon = fullDrawable.first;
                 int blurMargin = (int) mActivity.getResources()
                         .getDimension(R.dimen.blur_size_medium_outline) / 2;

                 Rect bounds = new Rect(0, 0, w, h);
                 bounds.inset(blurMargin, blurMargin);
                 // Badge is applied after icon normalization so the bounds for badge should not
                 // be scaled down due to icon normalization.
                 mBadge = fullDrawable.second;
                 FastBitmapDrawable.setBadgeBounds(mBadge, bounds);

                 try (LauncherIcons li = LauncherIcons.obtain(mActivity)) {
                     // Since we just want the scale, avoid heavy drawing operations
                     Utilities.scaleRectAboutCenter(bounds, li.getNormalizer().getScale(
                             new AdaptiveIconDrawable(new ColorDrawable(Color.BLACK), null),
                             null, null, null));
                 }

                 // Shrink very tiny bit so that the clip path is smaller than the original bitmap
                 // that has anti aliased edges and shadows.
                 Rect shrunkBounds = new Rect(bounds);
                 Utilities.scaleRectAboutCenter(shrunkBounds, 0.98f);
                 adaptiveIcon.setBounds(shrunkBounds);
                 final Path mask = adaptiveIcon.getIconMask();

                 mTranslateX = new SpringFloatValue(DragView.this,
                         w * AdaptiveIconDrawable.getExtraInsetFraction());
                 mTranslateY = new SpringFloatValue(DragView.this,
                         h * AdaptiveIconDrawable.getExtraInsetFraction());

                 bounds.inset(
                         (int) (-bounds.width() * AdaptiveIconDrawable.getExtraInsetFraction()),
                         (int) (-bounds.height() * AdaptiveIconDrawable.getExtraInsetFraction())
                 );
                 mBgSpringDrawable = adaptiveIcon.getBackground();
                 if (mBgSpringDrawable == null) {
                     mBgSpringDrawable = new ColorDrawable(Color.TRANSPARENT);
                 }
                 mBgSpringDrawable.setBounds(bounds);
                 mFgSpringDrawable = adaptiveIcon.getForeground();
                 if (mFgSpringDrawable == null) {
                     mFgSpringDrawable = new ColorDrawable(Color.TRANSPARENT);
                 }
                 mFgSpringDrawable.setBounds(bounds);

                 new Handler(Looper.getMainLooper()).post(() -> mOnDragStartCallback.add(() -> {
                     // TODO: Consider fade-in animation
                     // Assign the variable on the UI thread to avoid race conditions.
                     mScaledMaskPath = mask;
                     // Avoid relayout as we do not care about children affecting layout
                     removeAllViewsInLayout();

                     if (info.isDisabled()) {
                         ColorFilter filter = getDisabledColorFilter();
                         mBgSpringDrawable.setColorFilter(filter);
                         mFgSpringDrawable.setColorFilter(filter);
                         mBadge.setColorFilter(filter);
                     }
                     invalidate();
                 }));
             }
         });
     }

     /**
      * Called when pre-drag finishes for an icon
      */
     public void onDragStart() {
         mOnDragStartCallback.executeAllAndDestroy();
     }

     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         super.onMeasure(makeMeasureSpec(mWidth, EXACTLY), makeMeasureSpec(mHeight, EXACTLY));
     }

     public int getDragRegionWidth() {
         return mDragRegion.width();
     }

     public int getDragRegionHeight() {
         return mDragRegion.height();
     }

     public void setHasDragOffset(boolean hasDragOffset) {
         mHasDragOffset = hasDragOffset;
     }

     public boolean getHasDragOffset() {
         return mHasDragOffset;
     }

     public void setDragRegion(Rect r) {
         mDragRegion = r;
     }

     public Rect getDragRegion() {
         return mDragRegion;
     }

     @Override
     public void draw(Canvas canvas) {
         super.draw(canvas);

         // Draw after the content
         mHasDrawn = true;
         if (mScaledMaskPath != null) {
             int cnt = canvas.save();
             canvas.clipPath(mScaledMaskPath);
             mBgSpringDrawable.draw(canvas);
             canvas.translate(mTranslateX.mValue, mTranslateY.mValue);
             mFgSpringDrawable.draw(canvas);
             canvas.restoreToCount(cnt);
             mBadge.draw(canvas);
         }
     }

     public void crossFadeContent(Drawable crossFadeDrawable, int duration) {
         if (mContent.getParent() == null) {
             // If the content is already removed, ignore
             return;
         }
         ImageView newContent = getViewFromDrawable(getContext(), crossFadeDrawable);
         // We need to fill the ImageView with the content, otherwise the shapes of the final view
         // and the drag view might not match exactly
         newContent.setScaleType(ImageView.ScaleType.FIT_XY);
         newContent.measure(makeMeasureSpec(mWidth, EXACTLY), makeMeasureSpec(mHeight, EXACTLY));
         newContent.layout(0, 0, mWidth, mHeight);
         addViewInLayout(newContent, 0, new LayoutParams(mWidth, mHeight));

         AnimatorSet anim = new AnimatorSet();
         anim.play(ObjectAnimator.ofFloat(newContent, VIEW_ALPHA, 0, 1));
         anim.play(ObjectAnimator.ofFloat(mContent, VIEW_ALPHA, 0));
         anim.setDuration(duration).setInterpolator(Interpolators.DECELERATE_1_5);
         anim.start();
     }

     public boolean hasDrawn() {
         return mHasDrawn;
     }

     /**
      * Create a window containing this view and show it.
      *
      * @param touchX the x coordinate the user touched in DragLayer coordinates
      * @param touchY the y coordinate the user touched in DragLayer coordinates
      */
     public void show(int touchX, int touchY) {
         mDragLayer.addView(this);

         // Start the pick-up animation
         BaseDragLayer.LayoutParams lp = new BaseDragLayer.LayoutParams(mWidth, mHeight);
         lp.customPosition = true;
         setLayoutParams(lp);

         if (mContent != null) {
             // At the drag start, the source view visibility is set to invisible.
             if (getHasDragOffset()) {
                 // If there is any dragOffset, this means the content will show away of the original
                 // icon location, otherwise it's fine since original content would just show at the
                 // same spot.
                 mContent.setVisibility(INVISIBLE);
             } else {
                 mContent.setVisibility(VISIBLE);
             }
         }

         move(touchX, touchY);
         // Post the animation to skip other expensive work happening on the first frame
         post(mScaleAnim::start);
     }

     public void cancelAnimation() {
         if (mScaleAnim != null && mScaleAnim.isRunning()) {
             mScaleAnim.cancel();
         }
     }

     /** {@code true} if the scale animation has finished. */
     public boolean isScaleAnimationFinished() {
         return mScaleAnimStarted && !mScaleAnim.isRunning();
     }

     /** {@code true} if the shift animation has finished. */
     public boolean isShiftAnimationFinished() {
         return mShiftAnimStarted && !mShiftAnim.isRunning();
     }

     /**
      * Move the window containing this view.
      *
      * @param touchX the x coordinate the user touched in DragLayer coordinates
      * @param touchY the y coordinate the user touched in DragLayer coordinates
      */
     public void move(int touchX, int touchY) {
         if (touchX > 0 && touchY > 0 && mLastTouchX > 0 && mLastTouchY > 0
                 && mScaledMaskPath != null) {
             mTranslateX.animateToPos(mLastTouchX - touchX);
             mTranslateY.animateToPos(mLastTouchY - touchY);
         }
         mLastTouchX = touchX;
         mLastTouchY = touchY;
         applyTranslation();
     }

     /**
      * Animate this DragView to the given DragLayer coordinates and then remove it.
      */
     public abstract void animateTo(int toTouchX, int toTouchY, Runnable onCompleteRunnable,
             int duration);

     public void animateShift(final int shiftX, final int shiftY) {
         if (mShiftAnim.isStarted()) return;

         // Set mContent visibility to visible to show icon regardless in case it is INVISIBLE.
         if (mContent != null) mContent.setVisibility(VISIBLE);

         mAnimatedShiftX = shiftX;
         mAnimatedShiftY = shiftY;
         applyTranslation();
         mShiftAnim.addUpdateListener(new AnimatorUpdateListener() {
             @Override
             public void onAnimationUpdate(ValueAnimator animation) {
                 float fraction = 1 - animation.getAnimatedFraction();
                 mAnimatedShiftX = (int) (fraction * shiftX);
                 mAnimatedShiftY = (int) (fraction * shiftY);
                 applyTranslation();
             }
         });
         mShiftAnim.start();
     }

     private void applyTranslation() {
         setTranslationX(mLastTouchX - mRegistrationX + mAnimatedShiftX);
         setTranslationY(mLastTouchY - mRegistrationY + mAnimatedShiftY);
     }

     /**
      * Detaches {@link #mContent}, if previously attached, from this view.
      *
      * <p>In the case of no change in the drop position, sets {@code reattachToPreviousParent} to
      * {@code true} to attach the {@link #mContent} back to its previous parent.
      */
     public void detachContentView(boolean reattachToPreviousParent) {
         if (mContent != null && mContentViewParent != null && mContentViewInParentViewIndex >= 0) {
             Picture picture = new Picture();
             mContent.draw(picture.beginRecording(mWidth, mHeight));
             picture.endRecording();
             View view = new View(mActivity);
             view.setBackground(new PictureDrawable(picture));
             view.measure(makeMeasureSpec(mWidth, EXACTLY), makeMeasureSpec(mHeight, EXACTLY));
             view.layout(mContent.getLeft(), mContent.getTop(),
                     mContent.getRight(), mContent.getBottom());
             setClipToOutline(mContent.getClipToOutline());
             setOutlineProvider(mContent.getOutlineProvider());
             addViewInLayout(view, indexOfChild(mContent), mContent.getLayoutParams(), true);

             removeViewInLayout(mContent);
             mContent.setVisibility(INVISIBLE);
             mContent.setLayoutParams(mContentViewLayoutParams);
             if (reattachToPreviousParent) {
                 mContentViewParent.addView(mContent, mContentViewInParentViewIndex);
             }
             mContentViewParent = null;
             mContentViewInParentViewIndex = -1;
         }
     }

     /**
      * Removes this view from the {@link DragLayer}.
      *
      * <p>If the drag content is a {@link #mContent}, this call doesn't reattach the
      * {@link #mContent} back to its previous parent. To reattach to previous parent, the caller
      * should call {@link #detachContentView} with {@code reattachToPreviousParent} sets to true
      * before this call.
      */
     public void remove() {
         if (getParent() != null) {
             mDragLayer.removeView(DragView.this);
         }
     }

     public int getBlurSizeOutline() {
         return mBlurSizeOutline;
     }

     public float getInitialScale() {
         return mInitialScale;
     }

     public float getEndScale() {
         return mEndScale;
     }

     @Override
     public boolean hasOverlappingRendering() {
         return false;
     }

     /** Returns the current content view that is rendered in the drag view. */
     public View getContentView() {
         return mContent;
     }

     /**
      * Returns the previous {@link ViewGroup} parent of the {@link #mContent} before the drag
      * content is attached to this view.
      */
     @Nullable
     public ViewGroup getContentViewParent() {
         return mContentViewParent;
     }

     private static class SpringFloatValue {

         private static final FloatPropertyCompat<SpringFloatValue> VALUE =
                 new FloatPropertyCompat<SpringFloatValue>("value") {
                     @Override
                     public float getValue(SpringFloatValue object) {
                         return object.mValue;
                     }

                     @Override
                     public void setValue(SpringFloatValue object, float value) {
                         object.mValue = value;
                         object.mView.invalidate();
                     }
                 };

         // Following three values are fine tuned with motion ux designer
         private static final int STIFFNESS = 4000;
         private static final float DAMPENING_RATIO = 1f;
         private static final int PARALLAX_MAX_IN_DP = 8;

         private final View mView;
         private final SpringAnimation mSpring;
         private final float mDelta;

         private float mValue;

         public SpringFloatValue(View view, float range) {
             mView = view;
             mSpring = new SpringAnimation(this, VALUE, 0)
                     .setMinValue(-range).setMaxValue(range)
                     .setSpring(new SpringForce(0)
                             .setDampingRatio(DAMPENING_RATIO)
                             .setStiffness(STIFFNESS));
             mDelta = Math.min(
                     range, view.getResources().getDisplayMetrics().density * PARALLAX_MAX_IN_DP);
         }

         public void animateToPos(float value) {
             mSpring.animateToFinalPosition(Utilities.boundToRange(value, -mDelta, mDelta));
         }
     }

     private static ImageView getViewFromDrawable(Context context, Drawable drawable) {
         ImageView iv = new ImageView(context);
         iv.setImageDrawable(drawable);
         return iv;
     }

     /**
      * Removes any stray DragView from the DragLayer.
      */
     public static void removeAllViews(ActivityContext activity) {
         BaseDragLayer dragLayer = activity.getDragLayer();
         // Iterate in reverse order. DragView is added later to the dragLayer,
         // and will be one of the last views.
         for (int i = dragLayer.getChildCount() - 1; i >= 0; i--) {
             View child = dragLayer.getChildAt(i);
             if (child instanceof DragView) {
                 dragLayer.removeView(child);
             }
         }
     }
 }
	/*
	* Copyright (C) 2008 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.dragndrop;

	import static android.view.View.MeasureSpec.EXACTLY;
	import static android.view.View.MeasureSpec.makeMeasureSpec;

	import static com.android.launcher3.LauncherAnimUtils.VIEW_ALPHA;
	import static com.android.launcher3.icons.FastBitmapDrawable.getDisabledColorFilter;
	import static com.android.launcher3.util.Executors.MODEL_EXECUTOR;

	import android.animation.Animator;
	import android.animation.AnimatorListenerAdapter;
	import android.animation.AnimatorSet;
	import android.animation.ObjectAnimator;
	import android.animation.ValueAnimator;
	import android.animation.ValueAnimator.AnimatorUpdateListener;
	import android.annotation.TargetApi;
	import android.content.Context;
	import android.graphics.Canvas;
	import android.graphics.Color;
	import android.graphics.ColorFilter;
	import android.graphics.Path;
	import android.graphics.Picture;
	import android.graphics.Rect;
	import android.graphics.drawable.AdaptiveIconDrawable;
	import android.graphics.drawable.ColorDrawable;
	import android.graphics.drawable.Drawable;
	import android.graphics.drawable.PictureDrawable;
	import android.os.Build;
	import android.os.Handler;
	import android.os.Looper;
	import android.util.Pair;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.FrameLayout;
	import android.widget.ImageView;

	import androidx.annotation.Nullable;
	import androidx.dynamicanimation.animation.FloatPropertyCompat;
	import androidx.dynamicanimation.animation.SpringAnimation;
	import androidx.dynamicanimation.animation.SpringForce;

	import com.android.app.animation.Interpolators;
	import com.android.launcher3.R;
	import com.android.launcher3.Utilities;
	import com.android.launcher3.icons.FastBitmapDrawable;
	import com.android.launcher3.icons.LauncherIcons;
	import com.android.launcher3.model.data.ItemInfo;
	import com.android.launcher3.util.RunnableList;
	import com.android.launcher3.views.ActivityContext;
	import com.android.launcher3.views.BaseDragLayer;

	/** A custom view for rendering an icon, folder, shortcut or widget during drag-n-drop. */
	public abstract class DragView<T extends Context & ActivityContext> extends FrameLayout {

	public static final int VIEW_ZOOM_DURATION = 150;

	private final View mContent;
	// The following are only used for rendering mContent directly during drag-n-drop.
	@Nullable private ViewGroup.LayoutParams mContentViewLayoutParams;
	@Nullable private ViewGroup mContentViewParent;
	private int mContentViewInParentViewIndex = -1;
	private final int mWidth;
	private final int mHeight;

	private final int mBlurSizeOutline;
	protected final int mRegistrationX;
	protected final int mRegistrationY;
	private final float mInitialScale;
	private final float mEndScale;
	protected final float mScaleOnDrop;
	protected final int[] mTempLoc = new int[2];

	private final RunnableList mOnDragStartCallback = new RunnableList();

	private boolean mHasDragOffset;
	private Rect mDragRegion = null;
	protected final T mActivity;
	private final BaseDragLayer<T> mDragLayer;
	private boolean mHasDrawn = false;

	final ValueAnimator mScaleAnim;
	final ValueAnimator mShiftAnim;

	// Whether mAnim has started. Unlike mAnim.isStarted(), this is true even after mAnim ends.
	private boolean mScaleAnimStarted;
	private boolean mShiftAnimStarted;
	private Runnable mOnScaleAnimEndCallback;
	private Runnable mOnShiftAnimEndCallback;

	private int mLastTouchX;
	private int mLastTouchY;
	private int mAnimatedShiftX;
	private int mAnimatedShiftY;

	// Below variable only needed IF FeatureFlags.LAUNCHER3_SPRING_ICONS is {@code true}
	private Drawable mBgSpringDrawable, mFgSpringDrawable;
	private SpringFloatValue mTranslateX, mTranslateY;
	private Path mScaledMaskPath;
	private Drawable mBadge;

	public DragView(T launcher, Drawable drawable, int registrationX,
	int registrationY, final float initialScale, final float scaleOnDrop,
	final float finalScaleDps) {
	this(launcher, getViewFromDrawable(launcher, drawable),
	drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(),
	registrationX, registrationY, initialScale, scaleOnDrop, finalScaleDps);
	}

	/**
	* Construct the drag view.
	* <p>
	* The registration point is the point inside our view that the touch events should
	* be centered upon.
	* @param activity The Launcher instance/ActivityContext this DragView is in.
	* @param content the view content that is attached to the drag view.
	* @param width the width of the dragView
	* @param height the height of the dragView
	* @param initialScale The view that we're dragging around. We scale it up when we draw it.
	* @param registrationX The x coordinate of the registration point.
	* @param registrationY The y coordinate of the registration point.
	* @param scaleOnDrop the scale used in the drop animation.
	* @param finalScaleDps the scale used in the zoom out animation when the drag view is shown.
	*/
	public DragView(T activity, View content, int width, int height, int registrationX,
	int registrationY, final float initialScale, final float scaleOnDrop,
	final float finalScaleDps) {
	super(activity);
	mActivity = activity;
	mDragLayer = activity.getDragLayer();

	mContent = content;
	mWidth = width;
	mHeight = height;
	mContentViewLayoutParams = mContent.getLayoutParams();
	if (mContent.getParent() instanceof ViewGroup) {
	mContentViewParent = (ViewGroup) mContent.getParent();
	mContentViewInParentViewIndex = mContentViewParent.indexOfChild(mContent);
	mContentViewParent.removeView(mContent);
	}

	addView(content, new LayoutParams(width, height));

	// If there is already a scale set on the content, we don't want to clip the children.
	if (content.getScaleX() != 1 \|\| content.getScaleY() != 1) {
	setClipChildren(false);
	setClipToPadding(false);
	}

	mEndScale = (width + finalScaleDps) / width;

	// Set the initial scale to avoid any jumps
	setScaleX(initialScale);
	setScaleY(initialScale);

	// Animate the view into the correct position
	mScaleAnim = ValueAnimator.ofFloat(0f, 1f);
	mScaleAnim.setDuration(VIEW_ZOOM_DURATION);
	mScaleAnim.addUpdateListener(animation -> {
	final float value = (Float) animation.getAnimatedValue();
	setScaleX(Utilities.mapRange(value, initialScale, mEndScale));
	setScaleY(Utilities.mapRange(value, initialScale, mEndScale));
	if (!isAttachedToWindow()) {
	animation.cancel();
	}
	});
	mScaleAnim.addListener(new AnimatorListenerAdapter() {
	@Override
	public void onAnimationStart(Animator animation) {
	mScaleAnimStarted = true;
	}

	@Override
	public void onAnimationEnd(Animator animation) {
	super.onAnimationEnd(animation);
	if (mOnScaleAnimEndCallback != null) {
	mOnScaleAnimEndCallback.run();
	}
	}
	});
	// Set up the shift animator.
	mShiftAnim = ValueAnimator.ofFloat(0f, 1f);
	mShiftAnim.addListener(new AnimatorListenerAdapter() {
	@Override
	public void onAnimationStart(Animator animation) {
	mShiftAnimStarted = true;
	}

	@Override
	public void onAnimationEnd(Animator animation) {
	if (mOnShiftAnimEndCallback != null) {
	mOnShiftAnimEndCallback.run();
	}
	}
	});

	setDragRegion(new Rect(0, 0, width, height));

	// The point in our scaled bitmap that the touch events are located
	mRegistrationX = registrationX;
	mRegistrationY = registrationY;

	mInitialScale = initialScale;
	mScaleOnDrop = scaleOnDrop;

	// Force a measure, because Workspace uses getMeasuredHeight() before the layout pass
	measure(makeMeasureSpec(width, EXACTLY), makeMeasureSpec(height, EXACTLY));

	mBlurSizeOutline = getResources().getDimensionPixelSize(R.dimen.blur_size_medium_outline);
	setElevation(getResources().getDimension(R.dimen.drag_elevation));
	setWillNotDraw(false);
	}

	/** Callback invoked when the scale animation ends. */
	public void setOnScaleAnimEndCallback(Runnable callback) {
	mOnScaleAnimEndCallback = callback;
	}

	/** Callback invoked when the shift animation ends. */
	public void setOnShiftAnimEndCallback(Runnable callback) {
	mOnShiftAnimEndCallback = callback;
	}

	/**
	* Initialize {@code #mIconDrawable} if the item can be represented using
	* an {@link AdaptiveIconDrawable} or {@link FolderAdaptiveIcon}.
	*/
	@TargetApi(Build.VERSION_CODES.O)
	public void setItemInfo(final ItemInfo info) {
	// Load the adaptive icon on a background thread and add the view in ui thread.
	MODEL_EXECUTOR.getHandler().postAtFrontOfQueue(() -> {
	int w = mWidth;
	int h = mHeight;
	Pair<AdaptiveIconDrawable, Drawable> fullDrawable = Utilities.getFullDrawable(
	mActivity, info, w, h, true /* shouldThemeIcon */);
	if (fullDrawable != null) {
	AdaptiveIconDrawable adaptiveIcon = fullDrawable.first;
	int blurMargin = (int) mActivity.getResources()
	.getDimension(R.dimen.blur_size_medium_outline) / 2;

	Rect bounds = new Rect(0, 0, w, h);
	bounds.inset(blurMargin, blurMargin);
	// Badge is applied after icon normalization so the bounds for badge should not
	// be scaled down due to icon normalization.
	mBadge = fullDrawable.second;
	FastBitmapDrawable.setBadgeBounds(mBadge, bounds);

	try (LauncherIcons li = LauncherIcons.obtain(mActivity)) {
	// Since we just want the scale, avoid heavy drawing operations
	Utilities.scaleRectAboutCenter(bounds, li.getNormalizer().getScale(
	new AdaptiveIconDrawable(new ColorDrawable(Color.BLACK), null),
	null, null, null));
	}

	// Shrink very tiny bit so that the clip path is smaller than the original bitmap
	// that has anti aliased edges and shadows.
	Rect shrunkBounds = new Rect(bounds);
	Utilities.scaleRectAboutCenter(shrunkBounds, 0.98f);
	adaptiveIcon.setBounds(shrunkBounds);
	final Path mask = adaptiveIcon.getIconMask();

	mTranslateX = new SpringFloatValue(DragView.this,
	w * AdaptiveIconDrawable.getExtraInsetFraction());
	mTranslateY = new SpringFloatValue(DragView.this,
	h * AdaptiveIconDrawable.getExtraInsetFraction());

	bounds.inset(
	(int) (-bounds.width() * AdaptiveIconDrawable.getExtraInsetFraction()),
	(int) (-bounds.height() * AdaptiveIconDrawable.getExtraInsetFraction())
	);
	mBgSpringDrawable = adaptiveIcon.getBackground();
	if (mBgSpringDrawable == null) {
	mBgSpringDrawable = new ColorDrawable(Color.TRANSPARENT);
	}
	mBgSpringDrawable.setBounds(bounds);
	mFgSpringDrawable = adaptiveIcon.getForeground();
	if (mFgSpringDrawable == null) {
	mFgSpringDrawable = new ColorDrawable(Color.TRANSPARENT);
	}
	mFgSpringDrawable.setBounds(bounds);

	new Handler(Looper.getMainLooper()).post(() -> mOnDragStartCallback.add(() -> {
	// TODO: Consider fade-in animation
	// Assign the variable on the UI thread to avoid race conditions.
	mScaledMaskPath = mask;
	// Avoid relayout as we do not care about children affecting layout
	removeAllViewsInLayout();

	if (info.isDisabled()) {
	ColorFilter filter = getDisabledColorFilter();
	mBgSpringDrawable.setColorFilter(filter);
	mFgSpringDrawable.setColorFilter(filter);
	mBadge.setColorFilter(filter);
	}
	invalidate();
	}));
	}
	});
	}

	/**
	* Called when pre-drag finishes for an icon
	*/
	public void onDragStart() {
	mOnDragStartCallback.executeAllAndDestroy();
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
	super.onMeasure(makeMeasureSpec(mWidth, EXACTLY), makeMeasureSpec(mHeight, EXACTLY));
	}

	public int getDragRegionWidth() {
	return mDragRegion.width();
	}

	public int getDragRegionHeight() {
	return mDragRegion.height();
	}

	public void setHasDragOffset(boolean hasDragOffset) {
	mHasDragOffset = hasDragOffset;
	}

	public boolean getHasDragOffset() {
	return mHasDragOffset;
	}

	public void setDragRegion(Rect r) {
	mDragRegion = r;
	}

	public Rect getDragRegion() {
	return mDragRegion;
	}

	@Override
	public void draw(Canvas canvas) {
	super.draw(canvas);

	// Draw after the content
	mHasDrawn = true;
	if (mScaledMaskPath != null) {
	int cnt = canvas.save();
	canvas.clipPath(mScaledMaskPath);
	mBgSpringDrawable.draw(canvas);
	canvas.translate(mTranslateX.mValue, mTranslateY.mValue);
	mFgSpringDrawable.draw(canvas);
	canvas.restoreToCount(cnt);
	mBadge.draw(canvas);
	}
	}

	public void crossFadeContent(Drawable crossFadeDrawable, int duration) {
	if (mContent.getParent() == null) {
	// If the content is already removed, ignore
	return;
	}
	ImageView newContent = getViewFromDrawable(getContext(), crossFadeDrawable);
	// We need to fill the ImageView with the content, otherwise the shapes of the final view
	// and the drag view might not match exactly
	newContent.setScaleType(ImageView.ScaleType.FIT_XY);
	newContent.measure(makeMeasureSpec(mWidth, EXACTLY), makeMeasureSpec(mHeight, EXACTLY));
	newContent.layout(0, 0, mWidth, mHeight);
	addViewInLayout(newContent, 0, new LayoutParams(mWidth, mHeight));

	AnimatorSet anim = new AnimatorSet();
	anim.play(ObjectAnimator.ofFloat(newContent, VIEW_ALPHA, 0, 1));
	anim.play(ObjectAnimator.ofFloat(mContent, VIEW_ALPHA, 0));
	anim.setDuration(duration).setInterpolator(Interpolators.DECELERATE_1_5);
	anim.start();
	}

	public boolean hasDrawn() {
	return mHasDrawn;
	}

	/**
	* Create a window containing this view and show it.
	*
	* @param touchX the x coordinate the user touched in DragLayer coordinates
	* @param touchY the y coordinate the user touched in DragLayer coordinates
	*/
	public void show(int touchX, int touchY) {
	mDragLayer.addView(this);

	// Start the pick-up animation
	BaseDragLayer.LayoutParams lp = new BaseDragLayer.LayoutParams(mWidth, mHeight);
	lp.customPosition = true;
	setLayoutParams(lp);

	if (mContent != null) {
	// At the drag start, the source view visibility is set to invisible.
	if (getHasDragOffset()) {
	// If there is any dragOffset, this means the content will show away of the original
	// icon location, otherwise it's fine since original content would just show at the
	// same spot.
	mContent.setVisibility(INVISIBLE);
	} else {
	mContent.setVisibility(VISIBLE);
	}
	}

	move(touchX, touchY);
	// Post the animation to skip other expensive work happening on the first frame
	post(mScaleAnim::start);
	}

	public void cancelAnimation() {
	if (mScaleAnim != null && mScaleAnim.isRunning()) {
	mScaleAnim.cancel();
	}
	}

	/** {@code true} if the scale animation has finished. */
	public boolean isScaleAnimationFinished() {
	return mScaleAnimStarted && !mScaleAnim.isRunning();
	}

	/** {@code true} if the shift animation has finished. */
	public boolean isShiftAnimationFinished() {
	return mShiftAnimStarted && !mShiftAnim.isRunning();
	}

	/**
	* Move the window containing this view.
	*
	* @param touchX the x coordinate the user touched in DragLayer coordinates
	* @param touchY the y coordinate the user touched in DragLayer coordinates
	*/
	public void move(int touchX, int touchY) {
	if (touchX > 0 && touchY > 0 && mLastTouchX > 0 && mLastTouchY > 0
	&& mScaledMaskPath != null) {
	mTranslateX.animateToPos(mLastTouchX - touchX);
	mTranslateY.animateToPos(mLastTouchY - touchY);
	}
	mLastTouchX = touchX;
	mLastTouchY = touchY;
	applyTranslation();
	}

	/**
	* Animate this DragView to the given DragLayer coordinates and then remove it.
	*/
	public abstract void animateTo(int toTouchX, int toTouchY, Runnable onCompleteRunnable,
	int duration);

	public void animateShift(final int shiftX, final int shiftY) {
	if (mShiftAnim.isStarted()) return;

	// Set mContent visibility to visible to show icon regardless in case it is INVISIBLE.
	if (mContent != null) mContent.setVisibility(VISIBLE);

	mAnimatedShiftX = shiftX;
	mAnimatedShiftY = shiftY;
	applyTranslation();
	mShiftAnim.addUpdateListener(new AnimatorUpdateListener() {
	@Override
	public void onAnimationUpdate(ValueAnimator animation) {
	float fraction = 1 - animation.getAnimatedFraction();
	mAnimatedShiftX = (int) (fraction * shiftX);
	mAnimatedShiftY = (int) (fraction * shiftY);
	applyTranslation();
	}
	});
	mShiftAnim.start();
	}

	private void applyTranslation() {
	setTranslationX(mLastTouchX - mRegistrationX + mAnimatedShiftX);
	setTranslationY(mLastTouchY - mRegistrationY + mAnimatedShiftY);
	}

	/**
	* Detaches {@link #mContent}, if previously attached, from this view.
	*
	* <p>In the case of no change in the drop position, sets {@code reattachToPreviousParent} to
	* {@code true} to attach the {@link #mContent} back to its previous parent.
	*/
	public void detachContentView(boolean reattachToPreviousParent) {
	if (mContent != null && mContentViewParent != null && mContentViewInParentViewIndex >= 0) {
	Picture picture = new Picture();
	mContent.draw(picture.beginRecording(mWidth, mHeight));
	picture.endRecording();
	View view = new View(mActivity);
	view.setBackground(new PictureDrawable(picture));
	view.measure(makeMeasureSpec(mWidth, EXACTLY), makeMeasureSpec(mHeight, EXACTLY));
	view.layout(mContent.getLeft(), mContent.getTop(),
	mContent.getRight(), mContent.getBottom());
	setClipToOutline(mContent.getClipToOutline());
	setOutlineProvider(mContent.getOutlineProvider());
	addViewInLayout(view, indexOfChild(mContent), mContent.getLayoutParams(), true);

	removeViewInLayout(mContent);
	mContent.setVisibility(INVISIBLE);
	mContent.setLayoutParams(mContentViewLayoutParams);
	if (reattachToPreviousParent) {
	mContentViewParent.addView(mContent, mContentViewInParentViewIndex);
	}
	mContentViewParent = null;
	mContentViewInParentViewIndex = -1;
	}
	}

	/**
	* Removes this view from the {@link DragLayer}.
	*
	* <p>If the drag content is a {@link #mContent}, this call doesn't reattach the
	* {@link #mContent} back to its previous parent. To reattach to previous parent, the caller
	* should call {@link #detachContentView} with {@code reattachToPreviousParent} sets to true
	* before this call.
	*/
	public void remove() {
	if (getParent() != null) {
	mDragLayer.removeView(DragView.this);
	}
	}

	public int getBlurSizeOutline() {
	return mBlurSizeOutline;
	}

	public float getInitialScale() {
	return mInitialScale;
	}

	public float getEndScale() {
	return mEndScale;
	}

	@Override
	public boolean hasOverlappingRendering() {
	return false;
	}

	/** Returns the current content view that is rendered in the drag view. */
	public View getContentView() {
	return mContent;
	}

	/**
	* Returns the previous {@link ViewGroup} parent of the {@link #mContent} before the drag
	* content is attached to this view.
	*/
	@Nullable
	public ViewGroup getContentViewParent() {
	return mContentViewParent;
	}

	private static class SpringFloatValue {

	private static final FloatPropertyCompat<SpringFloatValue> VALUE =
	new FloatPropertyCompat<SpringFloatValue>("value") {
	@Override
	public float getValue(SpringFloatValue object) {
	return object.mValue;
	}

	@Override
	public void setValue(SpringFloatValue object, float value) {
	object.mValue = value;
	object.mView.invalidate();
	}
	};

	// Following three values are fine tuned with motion ux designer
	private static final int STIFFNESS = 4000;
	private static final float DAMPENING_RATIO = 1f;
	private static final int PARALLAX_MAX_IN_DP = 8;

	private final View mView;
	private final SpringAnimation mSpring;
	private final float mDelta;

	private float mValue;

	public SpringFloatValue(View view, float range) {
	mView = view;
	mSpring = new SpringAnimation(this, VALUE, 0)
	.setMinValue(-range).setMaxValue(range)
	.setSpring(new SpringForce(0)
	.setDampingRatio(DAMPENING_RATIO)
	.setStiffness(STIFFNESS));
	mDelta = Math.min(
	range, view.getResources().getDisplayMetrics().density * PARALLAX_MAX_IN_DP);
	}

	public void animateToPos(float value) {
	mSpring.animateToFinalPosition(Utilities.boundToRange(value, -mDelta, mDelta));
	}
	}

	private static ImageView getViewFromDrawable(Context context, Drawable drawable) {
	ImageView iv = new ImageView(context);
	iv.setImageDrawable(drawable);
	return iv;
	}

	/**
	* Removes any stray DragView from the DragLayer.
	*/
	public static void removeAllViews(ActivityContext activity) {
	BaseDragLayer dragLayer = activity.getDragLayer();
	// Iterate in reverse order. DragView is added later to the dragLayer,
	// and will be one of the last views.
	for (int i = dragLayer.getChildCount() - 1; i >= 0; i--) {
	View child = dragLayer.getChildAt(i);
	if (child instanceof DragView) {
	dragLayer.removeView(child);
	}
	}
	}
	}