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 com.android.launcher3.Utilities.getBadge;
 import static com.android.launcher3.util.Executors.MODEL_EXECUTOR;

 import android.animation.FloatArrayEvaluator;
 import android.animation.ValueAnimator;
 import android.animation.ValueAnimator.AnimatorUpdateListener;
 import android.annotation.TargetApi;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.ColorMatrix;
 import android.graphics.ColorMatrixColorFilter;
 import android.graphics.Paint;
 import android.graphics.Path;
 import android.graphics.Point;
 import android.graphics.Rect;
 import android.graphics.drawable.AdaptiveIconDrawable;
 import android.graphics.drawable.ColorDrawable;
 import android.graphics.drawable.Drawable;
 import android.os.Build;
 import android.os.Handler;
 import android.os.Looper;
 import android.view.View;

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

 import com.android.launcher3.FastBitmapDrawable;
 import com.android.launcher3.FirstFrameAnimatorHelper;
 import com.android.launcher3.Launcher;
 import com.android.launcher3.LauncherSettings;
 import com.android.launcher3.LauncherState;
 import com.android.launcher3.R;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.anim.Interpolators;
 import com.android.launcher3.icons.LauncherIcons;
 import com.android.launcher3.model.data.ItemInfo;
 import com.android.launcher3.statemanager.StateManager.StateListener;
 import com.android.launcher3.util.Themes;
 import com.android.launcher3.util.Thunk;

 import java.util.Arrays;

 public class DragView extends View implements StateListener<LauncherState> {
     private static final ColorMatrix sTempMatrix1 = new ColorMatrix();
     private static final ColorMatrix sTempMatrix2 = new ColorMatrix();

     public static final int COLOR_CHANGE_DURATION = 120;
     public static final int VIEW_ZOOM_DURATION = 150;

     private boolean mShouldDraw = true;
     private Drawable mDrawable;
     private Drawable mCrossFadeDrawable;
     @Thunk Paint mPaint;
     private final int mBlurSizeOutline;
     private final int mRegistrationX;
     private final int mRegistrationY;
     private final float mInitialScale;
     private final float mScaleOnDrop;
     private final int[] mTempLoc = new int[2];

     private Point mDragVisualizeOffset = null;
     private Rect mDragRegion = null;
     private final Launcher mLauncher;
     private final DragLayer mDragLayer;
     @Thunk final DragController mDragController;
     final FirstFrameAnimatorHelper mFirstFrameAnimatorHelper;
     private boolean mHasDrawn = false;
     @Thunk float mCrossFadeProgress = 0f;
     private boolean mAnimationCancelled = false;

     ValueAnimator mAnim;
     // The intrinsic icon scale factor is the scale factor for a drag icon over the workspace
     // size.  This is ignored for non-icons.
     private float mIntrinsicIconScale = 1f;

     @Thunk float[] mCurrentFilter;
     private ValueAnimator mFilterAnimator;

     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;
     private ColorMatrixColorFilter mBaseFilter;

     /**
      * Construct the drag view.
      * <p>
      * The registration point is the point inside our view that the touch events should
      * be centered upon.
      * @param launcher The Launcher instance
      * @param drawable 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.
      */
     public DragView(Launcher launcher, Drawable drawable, int registrationX,
             int registrationY, final float initialScale, final float scaleOnDrop,
             final float finalScaleDps) {
         super(launcher);
         mLauncher = launcher;
         mDragLayer = launcher.getDragLayer();
         mDragController = launcher.getDragController();
         mFirstFrameAnimatorHelper = new FirstFrameAnimatorHelper(this);

         final float scale = (drawable.getIntrinsicWidth() + finalScaleDps)
                 / drawable.getIntrinsicWidth();

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

         // Animate the view into the correct position
         mAnim = ValueAnimator.ofFloat(0f, 1f);
         mAnim.setDuration(VIEW_ZOOM_DURATION);
         mAnim.addUpdateListener(animation -> {
             final float value = (Float) animation.getAnimatedValue();
             setScaleX(initialScale + (value * (scale - initialScale)));
             setScaleY(initialScale + (value * (scale - initialScale)));
             if (!isAttachedToWindow()) {
                 animation.cancel();
             }
         });

         mDrawable = drawable;
         setDragRegion(new Rect(0, 0, drawable.getIntrinsicWidth(),
                 drawable.getIntrinsicHeight()));

         // 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
         int ms = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
         measure(ms, ms);
         mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);

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

     @Override
     protected void onAttachedToWindow() {
         super.onAttachedToWindow();
         mLauncher.getStateManager().addStateListener(this);
     }

     @Override
     protected void onDetachedFromWindow() {
         super.onDetachedFromWindow();
         mLauncher.getStateManager().removeStateListener(this);
     }

     @Override
     public void onStateTransitionComplete(LauncherState finalState) {
         setVisibility((finalState == LauncherState.NORMAL
                 || finalState == LauncherState.SPRING_LOADED) ? VISIBLE : INVISIBLE);
     }

     /**
      * 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) {
         if (info.itemType != LauncherSettings.Favorites.ITEM_TYPE_APPLICATION &&
                 info.itemType != LauncherSettings.Favorites.ITEM_TYPE_DEEP_SHORTCUT &&
                 info.itemType != LauncherSettings.Favorites.ITEM_TYPE_FOLDER) {
             return;
         }
         // Load the adaptive icon on a background thread and add the view in ui thread.
         MODEL_EXECUTOR.getHandler().postAtFrontOfQueue(new Runnable() {
             @Override
             public void run() {
                 Object[] outObj = new Object[1];
                 int w = mDrawable.getIntrinsicWidth();
                 int h = mDrawable.getIntrinsicHeight();
                 Drawable dr = Utilities.getFullDrawable(mLauncher, info, w, h, outObj);

                 if (dr instanceof AdaptiveIconDrawable) {
                     int blurMargin = (int) mLauncher.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.
                     Rect badgeBounds = new Rect(bounds);
                     mBadge = getBadge(mLauncher, info, outObj[0]);
                     mBadge.setBounds(badgeBounds);

                     // Do not draw the background in case of folder as its translucent
                     mShouldDraw = !(dr instanceof FolderAdaptiveIcon);

                     try (LauncherIcons li = LauncherIcons.obtain(mLauncher)) {
                         Drawable nDr; // drawable to be normalized
                         if (mShouldDraw) {
                             nDr = dr;
                         } else {
                             // Since we just want the scale, avoid heavy drawing operations
                             nDr = new AdaptiveIconDrawable(new ColorDrawable(Color.BLACK), null);
                         }
                         Utilities.scaleRectAboutCenter(bounds,
                                 li.getNormalizer().getScale(nDr, null, null, null));
                     }
                     AdaptiveIconDrawable adaptiveIcon = (AdaptiveIconDrawable) dr;

                     // 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(new Runnable() {
                         @Override
                         public void run() {
                             // Assign the variable on the UI thread to avoid race conditions.
                             mScaledMaskPath = mask;

                             if (info.isDisabled()) {
                                 FastBitmapDrawable d = new FastBitmapDrawable((Bitmap) null);
                                 d.setIsDisabled(true);
                                 mBaseFilter = (ColorMatrixColorFilter) d.getColorFilter();
                             }
                             updateColorFilter();
                         }
                     });
                 }
             }});
     }

     @TargetApi(Build.VERSION_CODES.O)
     private void updateColorFilter() {
         if (mCurrentFilter == null) {
             mPaint.setColorFilter(null);

             if (mScaledMaskPath != null) {
                 mBgSpringDrawable.setColorFilter(mBaseFilter);
                 mFgSpringDrawable.setColorFilter(mBaseFilter);
                 mBadge.setColorFilter(mBaseFilter);
             }
         } else {
             ColorMatrixColorFilter currentFilter = new ColorMatrixColorFilter(mCurrentFilter);
             mPaint.setColorFilter(currentFilter);

             if (mScaledMaskPath != null) {
                 if (mBaseFilter != null) {
                     mBaseFilter.getColorMatrix(sTempMatrix1);
                     sTempMatrix2.set(mCurrentFilter);
                     sTempMatrix1.postConcat(sTempMatrix2);

                     currentFilter = new ColorMatrixColorFilter(sTempMatrix1);
                 }

                 mBgSpringDrawable.setColorFilter(currentFilter);
                 mFgSpringDrawable.setColorFilter(currentFilter);
                 mBadge.setColorFilter(currentFilter);
             }
         }

         invalidate();
     }

     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         setMeasuredDimension(mDrawable.getIntrinsicWidth(), mDrawable.getIntrinsicHeight());
     }

     /** Sets the scale of the view over the normal workspace icon size. */
     public void setIntrinsicIconScaleFactor(float scale) {
         mIntrinsicIconScale = scale;
     }

     public float getIntrinsicIconScaleFactor() {
         return mIntrinsicIconScale;
     }

     public int getDragRegionLeft() {
         return mDragRegion.left;
     }

     public int getDragRegionTop() {
         return mDragRegion.top;
     }

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

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

     public void setDragVisualizeOffset(Point p) {
         mDragVisualizeOffset = p;
     }

     public Point getDragVisualizeOffset() {
         return mDragVisualizeOffset;
     }

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

     public Rect getDragRegion() {
         return mDragRegion;
     }

     @Override
     protected void onDraw(Canvas canvas) {
         mHasDrawn = true;

         if (mShouldDraw) {
             // Always draw the bitmap to mask anti aliasing due to clipPath
             boolean crossFade = mCrossFadeProgress > 0 && mCrossFadeDrawable != null;
             if (crossFade) {
                 int alpha = crossFade ? (int) (255 * (1 - mCrossFadeProgress)) : 255;
                 mPaint.setAlpha(alpha);
             }
             mDrawable.setColorFilter(mPaint.getColorFilter());
             mDrawable.setAlpha(mPaint.getAlpha());
             mDrawable.setBounds(
                     new Rect(0, 0, mDrawable.getIntrinsicWidth(),
                             mDrawable.getIntrinsicHeight()));
             mDrawable.draw(canvas);
             if (crossFade) {
                 mPaint.setAlpha((int) (255 * mCrossFadeProgress));
                 final int saveCount = canvas.save();
                 float sX = ((float) mDrawable.getIntrinsicWidth())
                         / mCrossFadeDrawable.getIntrinsicWidth();
                 float sY = ((float) mDrawable.getIntrinsicHeight())
                         / mCrossFadeDrawable.getIntrinsicHeight();
                 canvas.scale(sX, sY);
                 mCrossFadeDrawable.setColorFilter(mPaint.getColorFilter());
                 mCrossFadeDrawable.setAlpha(mPaint.getAlpha());
                 mDrawable.setBounds(
                         new Rect(0, 0, mDrawable.getIntrinsicWidth(),
                                 mDrawable.getIntrinsicHeight()));
                 mCrossFadeDrawable.draw(canvas);
                 canvas.restoreToCount(saveCount);
             }
         }

         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 setCrossFadeDrawable(Drawable crossFadeDrawable) {
         mCrossFadeDrawable = crossFadeDrawable;
     }

     public void crossFade(int duration) {
         ValueAnimator va = ValueAnimator.ofFloat(0f, 1f);
         va.setDuration(duration);
         va.setInterpolator(Interpolators.DEACCEL_1_5);
         va.addUpdateListener(a -> {
             mCrossFadeProgress = a.getAnimatedFraction();
             invalidate();
         });
         va.start();
     }

     public void setColor(int color) {
         if (mPaint == null) {
             mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
         }
         if (color != 0) {
             ColorMatrix m1 = new ColorMatrix();
             m1.setSaturation(0);

             ColorMatrix m2 = new ColorMatrix();
             Themes.setColorScaleOnMatrix(color, m2);
             m1.postConcat(m2);

             animateFilterTo(m1.getArray());
         } else {
             if (mCurrentFilter == null) {
                 updateColorFilter();
             } else {
                 animateFilterTo(new ColorMatrix().getArray());
             }
         }
     }

     private void animateFilterTo(float[] targetFilter) {
         float[] oldFilter = mCurrentFilter == null ? new ColorMatrix().getArray() : mCurrentFilter;
         mCurrentFilter = Arrays.copyOf(oldFilter, oldFilter.length);

         if (mFilterAnimator != null) {
             mFilterAnimator.cancel();
         }
         mFilterAnimator = ValueAnimator.ofObject(new FloatArrayEvaluator(mCurrentFilter),
                 oldFilter, targetFilter);
         mFilterAnimator.setDuration(COLOR_CHANGE_DURATION);
         mFilterAnimator.addUpdateListener(new AnimatorUpdateListener() {

             @Override
             public void onAnimationUpdate(ValueAnimator animation) {
                 updateColorFilter();
             }
         });
         mFilterAnimator.start();
     }

     public boolean hasDrawn() {
         return mHasDrawn;
     }

     @Override
     public void setAlpha(float alpha) {
         super.setAlpha(alpha);
         mPaint.setAlpha((int) (255 * alpha));
         invalidate();
     }

     /**
      * 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
         DragLayer.LayoutParams lp = new DragLayer.LayoutParams(0, 0);
         lp.width = mDrawable.getIntrinsicWidth();
         lp.height = mDrawable.getIntrinsicHeight();
         lp.customPosition = true;
         setLayoutParams(lp);
         move(touchX, touchY);
         // Post the animation to skip other expensive work happening on the first frame
         post(new Runnable() {
             public void run() {
                 mAnim.start();
             }
         });
     }

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

     /**
      * 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();
     }

     public void animateTo(int toTouchX, int toTouchY, Runnable onCompleteRunnable, int duration) {
         mTempLoc[0] = toTouchX - mRegistrationX;
         mTempLoc[1] = toTouchY - mRegistrationY;
         mDragLayer.animateViewIntoPosition(this, mTempLoc, 1f, mScaleOnDrop, mScaleOnDrop,
                 DragLayer.ANIMATION_END_DISAPPEAR, onCompleteRunnable, duration);
     }

     public void animateShift(final int shiftX, final int shiftY) {
         if (mAnim.isStarted()) {
             return;
         }
         mAnimatedShiftX = shiftX;
         mAnimatedShiftY = shiftY;
         applyTranslation();
         mAnim.addUpdateListener(new AnimatorUpdateListener() {
             @Override
             public void onAnimationUpdate(ValueAnimator animation) {
                 float fraction = 1 - animation.getAnimatedFraction();
                 mAnimatedShiftX = (int) (fraction * shiftX);
                 mAnimatedShiftY = (int) (fraction * shiftY);
                 applyTranslation();
             }
         });
     }

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

     public void remove() {
         if (getParent() != null) {
             mDragLayer.removeView(DragView.this);
         }
     }

     public int getBlurSizeOutline() {
         return mBlurSizeOutline;
     }

     public float getInitialScale() {
         return mInitialScale;
     }

     /** Returns the current {@link Drawable} that is rendered in this view. */
     public Drawable getDrawable() {
         return mDrawable;
     }

     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 final static int STIFFNESS = 4000;
         private final static float DAMPENING_RATIO = 1f;
         private final static 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 = view.getResources().getDisplayMetrics().density * PARALLAX_MAX_IN_DP;
         }

         public void animateToPos(float value) {
             mSpring.animateToFinalPosition(Utilities.boundToRange(value, -mDelta, mDelta));
         }
     }
 }
	/*
	* 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 com.android.launcher3.Utilities.getBadge;
	import static com.android.launcher3.util.Executors.MODEL_EXECUTOR;

	import android.animation.FloatArrayEvaluator;
	import android.animation.ValueAnimator;
	import android.animation.ValueAnimator.AnimatorUpdateListener;
	import android.annotation.TargetApi;
	import android.graphics.Bitmap;
	import android.graphics.Canvas;
	import android.graphics.Color;
	import android.graphics.ColorMatrix;
	import android.graphics.ColorMatrixColorFilter;
	import android.graphics.Paint;
	import android.graphics.Path;
	import android.graphics.Point;
	import android.graphics.Rect;
	import android.graphics.drawable.AdaptiveIconDrawable;
	import android.graphics.drawable.ColorDrawable;
	import android.graphics.drawable.Drawable;
	import android.os.Build;
	import android.os.Handler;
	import android.os.Looper;
	import android.view.View;

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

	import com.android.launcher3.FastBitmapDrawable;
	import com.android.launcher3.FirstFrameAnimatorHelper;
	import com.android.launcher3.Launcher;
	import com.android.launcher3.LauncherSettings;
	import com.android.launcher3.LauncherState;
	import com.android.launcher3.R;
	import com.android.launcher3.Utilities;
	import com.android.launcher3.anim.Interpolators;
	import com.android.launcher3.icons.LauncherIcons;
	import com.android.launcher3.model.data.ItemInfo;
	import com.android.launcher3.statemanager.StateManager.StateListener;
	import com.android.launcher3.util.Themes;
	import com.android.launcher3.util.Thunk;

	import java.util.Arrays;

	public class DragView extends View implements StateListener<LauncherState> {
	private static final ColorMatrix sTempMatrix1 = new ColorMatrix();
	private static final ColorMatrix sTempMatrix2 = new ColorMatrix();

	public static final int COLOR_CHANGE_DURATION = 120;
	public static final int VIEW_ZOOM_DURATION = 150;

	private boolean mShouldDraw = true;
	private Drawable mDrawable;
	private Drawable mCrossFadeDrawable;
	@Thunk Paint mPaint;
	private final int mBlurSizeOutline;
	private final int mRegistrationX;
	private final int mRegistrationY;
	private final float mInitialScale;
	private final float mScaleOnDrop;
	private final int[] mTempLoc = new int[2];

	private Point mDragVisualizeOffset = null;
	private Rect mDragRegion = null;
	private final Launcher mLauncher;
	private final DragLayer mDragLayer;
	@Thunk final DragController mDragController;
	final FirstFrameAnimatorHelper mFirstFrameAnimatorHelper;
	private boolean mHasDrawn = false;
	@Thunk float mCrossFadeProgress = 0f;
	private boolean mAnimationCancelled = false;

	ValueAnimator mAnim;
	// The intrinsic icon scale factor is the scale factor for a drag icon over the workspace
	// size. This is ignored for non-icons.
	private float mIntrinsicIconScale = 1f;

	@Thunk float[] mCurrentFilter;
	private ValueAnimator mFilterAnimator;

	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;
	private ColorMatrixColorFilter mBaseFilter;

	/**
	* Construct the drag view.
	* <p>
	* The registration point is the point inside our view that the touch events should
	* be centered upon.
	* @param launcher The Launcher instance
	* @param drawable 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.
	*/
	public DragView(Launcher launcher, Drawable drawable, int registrationX,
	int registrationY, final float initialScale, final float scaleOnDrop,
	final float finalScaleDps) {
	super(launcher);
	mLauncher = launcher;
	mDragLayer = launcher.getDragLayer();
	mDragController = launcher.getDragController();
	mFirstFrameAnimatorHelper = new FirstFrameAnimatorHelper(this);

	final float scale = (drawable.getIntrinsicWidth() + finalScaleDps)
	/ drawable.getIntrinsicWidth();

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

	// Animate the view into the correct position
	mAnim = ValueAnimator.ofFloat(0f, 1f);
	mAnim.setDuration(VIEW_ZOOM_DURATION);
	mAnim.addUpdateListener(animation -> {
	final float value = (Float) animation.getAnimatedValue();
	setScaleX(initialScale + (value * (scale - initialScale)));
	setScaleY(initialScale + (value * (scale - initialScale)));
	if (!isAttachedToWindow()) {
	animation.cancel();
	}
	});

	mDrawable = drawable;
	setDragRegion(new Rect(0, 0, drawable.getIntrinsicWidth(),
	drawable.getIntrinsicHeight()));

	// 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
	int ms = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
	measure(ms, ms);
	mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);

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

	@Override
	protected void onAttachedToWindow() {
	super.onAttachedToWindow();
	mLauncher.getStateManager().addStateListener(this);
	}

	@Override
	protected void onDetachedFromWindow() {
	super.onDetachedFromWindow();
	mLauncher.getStateManager().removeStateListener(this);
	}

	@Override
	public void onStateTransitionComplete(LauncherState finalState) {
	setVisibility((finalState == LauncherState.NORMAL
	\|\| finalState == LauncherState.SPRING_LOADED) ? VISIBLE : INVISIBLE);
	}

	/**
	* 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) {
	if (info.itemType != LauncherSettings.Favorites.ITEM_TYPE_APPLICATION &&
	info.itemType != LauncherSettings.Favorites.ITEM_TYPE_DEEP_SHORTCUT &&
	info.itemType != LauncherSettings.Favorites.ITEM_TYPE_FOLDER) {
	return;
	}
	// Load the adaptive icon on a background thread and add the view in ui thread.
	MODEL_EXECUTOR.getHandler().postAtFrontOfQueue(new Runnable() {
	@Override
	public void run() {
	Object[] outObj = new Object[1];
	int w = mDrawable.getIntrinsicWidth();
	int h = mDrawable.getIntrinsicHeight();
	Drawable dr = Utilities.getFullDrawable(mLauncher, info, w, h, outObj);

	if (dr instanceof AdaptiveIconDrawable) {
	int blurMargin = (int) mLauncher.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.
	Rect badgeBounds = new Rect(bounds);
	mBadge = getBadge(mLauncher, info, outObj[0]);
	mBadge.setBounds(badgeBounds);

	// Do not draw the background in case of folder as its translucent
	mShouldDraw = !(dr instanceof FolderAdaptiveIcon);

	try (LauncherIcons li = LauncherIcons.obtain(mLauncher)) {
	Drawable nDr; // drawable to be normalized
	if (mShouldDraw) {
	nDr = dr;
	} else {
	// Since we just want the scale, avoid heavy drawing operations
	nDr = new AdaptiveIconDrawable(new ColorDrawable(Color.BLACK), null);
	}
	Utilities.scaleRectAboutCenter(bounds,
	li.getNormalizer().getScale(nDr, null, null, null));
	}
	AdaptiveIconDrawable adaptiveIcon = (AdaptiveIconDrawable) dr;

	// 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(new Runnable() {
	@Override
	public void run() {
	// Assign the variable on the UI thread to avoid race conditions.
	mScaledMaskPath = mask;

	if (info.isDisabled()) {
	FastBitmapDrawable d = new FastBitmapDrawable((Bitmap) null);
	d.setIsDisabled(true);
	mBaseFilter = (ColorMatrixColorFilter) d.getColorFilter();
	}
	updateColorFilter();
	}
	});
	}
	}});
	}

	@TargetApi(Build.VERSION_CODES.O)
	private void updateColorFilter() {
	if (mCurrentFilter == null) {
	mPaint.setColorFilter(null);

	if (mScaledMaskPath != null) {
	mBgSpringDrawable.setColorFilter(mBaseFilter);
	mFgSpringDrawable.setColorFilter(mBaseFilter);
	mBadge.setColorFilter(mBaseFilter);
	}
	} else {
	ColorMatrixColorFilter currentFilter = new ColorMatrixColorFilter(mCurrentFilter);
	mPaint.setColorFilter(currentFilter);

	if (mScaledMaskPath != null) {
	if (mBaseFilter != null) {
	mBaseFilter.getColorMatrix(sTempMatrix1);
	sTempMatrix2.set(mCurrentFilter);
	sTempMatrix1.postConcat(sTempMatrix2);

	currentFilter = new ColorMatrixColorFilter(sTempMatrix1);
	}

	mBgSpringDrawable.setColorFilter(currentFilter);
	mFgSpringDrawable.setColorFilter(currentFilter);
	mBadge.setColorFilter(currentFilter);
	}
	}

	invalidate();
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
	setMeasuredDimension(mDrawable.getIntrinsicWidth(), mDrawable.getIntrinsicHeight());
	}

	/** Sets the scale of the view over the normal workspace icon size. */
	public void setIntrinsicIconScaleFactor(float scale) {
	mIntrinsicIconScale = scale;
	}

	public float getIntrinsicIconScaleFactor() {
	return mIntrinsicIconScale;
	}

	public int getDragRegionLeft() {
	return mDragRegion.left;
	}

	public int getDragRegionTop() {
	return mDragRegion.top;
	}

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

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

	public void setDragVisualizeOffset(Point p) {
	mDragVisualizeOffset = p;
	}

	public Point getDragVisualizeOffset() {
	return mDragVisualizeOffset;
	}

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

	public Rect getDragRegion() {
	return mDragRegion;
	}

	@Override
	protected void onDraw(Canvas canvas) {
	mHasDrawn = true;

	if (mShouldDraw) {
	// Always draw the bitmap to mask anti aliasing due to clipPath
	boolean crossFade = mCrossFadeProgress > 0 && mCrossFadeDrawable != null;
	if (crossFade) {
	int alpha = crossFade ? (int) (255 * (1 - mCrossFadeProgress)) : 255;
	mPaint.setAlpha(alpha);
	}
	mDrawable.setColorFilter(mPaint.getColorFilter());
	mDrawable.setAlpha(mPaint.getAlpha());
	mDrawable.setBounds(
	new Rect(0, 0, mDrawable.getIntrinsicWidth(),
	mDrawable.getIntrinsicHeight()));
	mDrawable.draw(canvas);
	if (crossFade) {
	mPaint.setAlpha((int) (255 * mCrossFadeProgress));
	final int saveCount = canvas.save();
	float sX = ((float) mDrawable.getIntrinsicWidth())
	/ mCrossFadeDrawable.getIntrinsicWidth();
	float sY = ((float) mDrawable.getIntrinsicHeight())
	/ mCrossFadeDrawable.getIntrinsicHeight();
	canvas.scale(sX, sY);
	mCrossFadeDrawable.setColorFilter(mPaint.getColorFilter());
	mCrossFadeDrawable.setAlpha(mPaint.getAlpha());
	mDrawable.setBounds(
	new Rect(0, 0, mDrawable.getIntrinsicWidth(),
	mDrawable.getIntrinsicHeight()));
	mCrossFadeDrawable.draw(canvas);
	canvas.restoreToCount(saveCount);
	}
	}

	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 setCrossFadeDrawable(Drawable crossFadeDrawable) {
	mCrossFadeDrawable = crossFadeDrawable;
	}

	public void crossFade(int duration) {
	ValueAnimator va = ValueAnimator.ofFloat(0f, 1f);
	va.setDuration(duration);
	va.setInterpolator(Interpolators.DEACCEL_1_5);
	va.addUpdateListener(a -> {
	mCrossFadeProgress = a.getAnimatedFraction();
	invalidate();
	});
	va.start();
	}

	public void setColor(int color) {
	if (mPaint == null) {
	mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
	}
	if (color != 0) {
	ColorMatrix m1 = new ColorMatrix();
	m1.setSaturation(0);

	ColorMatrix m2 = new ColorMatrix();
	Themes.setColorScaleOnMatrix(color, m2);
	m1.postConcat(m2);

	animateFilterTo(m1.getArray());
	} else {
	if (mCurrentFilter == null) {
	updateColorFilter();
	} else {
	animateFilterTo(new ColorMatrix().getArray());
	}
	}
	}

	private void animateFilterTo(float[] targetFilter) {
	float[] oldFilter = mCurrentFilter == null ? new ColorMatrix().getArray() : mCurrentFilter;
	mCurrentFilter = Arrays.copyOf(oldFilter, oldFilter.length);

	if (mFilterAnimator != null) {
	mFilterAnimator.cancel();
	}
	mFilterAnimator = ValueAnimator.ofObject(new FloatArrayEvaluator(mCurrentFilter),
	oldFilter, targetFilter);
	mFilterAnimator.setDuration(COLOR_CHANGE_DURATION);
	mFilterAnimator.addUpdateListener(new AnimatorUpdateListener() {

	@Override
	public void onAnimationUpdate(ValueAnimator animation) {
	updateColorFilter();
	}
	});
	mFilterAnimator.start();
	}

	public boolean hasDrawn() {
	return mHasDrawn;
	}

	@Override
	public void setAlpha(float alpha) {
	super.setAlpha(alpha);
	mPaint.setAlpha((int) (255 * alpha));
	invalidate();
	}

	/**
	* 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
	DragLayer.LayoutParams lp = new DragLayer.LayoutParams(0, 0);
	lp.width = mDrawable.getIntrinsicWidth();
	lp.height = mDrawable.getIntrinsicHeight();
	lp.customPosition = true;
	setLayoutParams(lp);
	move(touchX, touchY);
	// Post the animation to skip other expensive work happening on the first frame
	post(new Runnable() {
	public void run() {
	mAnim.start();
	}
	});
	}

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

	/**
	* 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();
	}

	public void animateTo(int toTouchX, int toTouchY, Runnable onCompleteRunnable, int duration) {
	mTempLoc[0] = toTouchX - mRegistrationX;
	mTempLoc[1] = toTouchY - mRegistrationY;
	mDragLayer.animateViewIntoPosition(this, mTempLoc, 1f, mScaleOnDrop, mScaleOnDrop,
	DragLayer.ANIMATION_END_DISAPPEAR, onCompleteRunnable, duration);
	}

	public void animateShift(final int shiftX, final int shiftY) {
	if (mAnim.isStarted()) {
	return;
	}
	mAnimatedShiftX = shiftX;
	mAnimatedShiftY = shiftY;
	applyTranslation();
	mAnim.addUpdateListener(new AnimatorUpdateListener() {
	@Override
	public void onAnimationUpdate(ValueAnimator animation) {
	float fraction = 1 - animation.getAnimatedFraction();
	mAnimatedShiftX = (int) (fraction * shiftX);
	mAnimatedShiftY = (int) (fraction * shiftY);
	applyTranslation();
	}
	});
	}

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

	public void remove() {
	if (getParent() != null) {
	mDragLayer.removeView(DragView.this);
	}
	}

	public int getBlurSizeOutline() {
	return mBlurSizeOutline;
	}

	public float getInitialScale() {
	return mInitialScale;
	}

	/** Returns the current {@link Drawable} that is rendered in this view. */
	public Drawable getDrawable() {
	return mDrawable;
	}

	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 final static int STIFFNESS = 4000;
	private final static float DAMPENING_RATIO = 1f;
	private final static 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 = view.getResources().getDisplayMetrics().density * PARALLAX_MAX_IN_DP;
	}

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