android-35/android/transition/ChangeBounds.java - platform/prebuilts/fullsdk/sources - Git at Google

 /*
  * Copyright (C) 2013 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 android.transition;

 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
 import android.animation.PropertyValuesHolder;
 import android.animation.RectEvaluator;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.compat.annotation.UnsupportedAppUsage;
 import android.content.Context;
 import android.content.res.TypedArray;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Path;
 import android.graphics.PointF;
 import android.graphics.Rect;
 import android.graphics.drawable.BitmapDrawable;
 import android.graphics.drawable.Drawable;
 import android.os.Build;
 import android.util.AttributeSet;
 import android.util.Property;
 import android.view.View;
 import android.view.ViewGroup;

 import com.android.internal.R;

 import java.util.Map;

 /**
  * This transition captures the layout bounds of target views before and after
  * the scene change and animates those changes during the transition.
  *
  * <p>A ChangeBounds transition can be described in a resource file by using the
  * tag <code>changeBounds</code>, using its attributes of
  * {@link android.R.styleable#ChangeBounds} along with the other standard
  * attributes of {@link android.R.styleable#Transition}.</p>
  */
 public class ChangeBounds extends Transition {

     private static final String PROPNAME_BOUNDS = "android:changeBounds:bounds";
     private static final String PROPNAME_CLIP = "android:changeBounds:clip";
     private static final String PROPNAME_PARENT = "android:changeBounds:parent";
     private static final String PROPNAME_WINDOW_X = "android:changeBounds:windowX";
     private static final String PROPNAME_WINDOW_Y = "android:changeBounds:windowY";
     private static final String[] sTransitionProperties = {
             PROPNAME_BOUNDS,
             PROPNAME_CLIP,
             PROPNAME_PARENT,
             PROPNAME_WINDOW_X,
             PROPNAME_WINDOW_Y
     };

     private static final Property<Drawable, PointF> DRAWABLE_ORIGIN_PROPERTY =
             new Property<Drawable, PointF>(PointF.class, "boundsOrigin") {
                 private Rect mBounds = new Rect();

                 @Override
                 public void set(Drawable object, PointF value) {
                     object.copyBounds(mBounds);
                     mBounds.offsetTo(Math.round(value.x), Math.round(value.y));
                     object.setBounds(mBounds);
                 }

                 @Override
                 public PointF get(Drawable object) {
                     object.copyBounds(mBounds);
                     return new PointF(mBounds.left, mBounds.top);
                 }
     };

     private static final Property<ViewBounds, PointF> TOP_LEFT_PROPERTY =
             new Property<ViewBounds, PointF>(PointF.class, "topLeft") {
                 @Override
                 public void set(ViewBounds viewBounds, PointF topLeft) {
                     viewBounds.setTopLeft(topLeft);
                 }

                 @Override
                 public PointF get(ViewBounds viewBounds) {
                     return null;
                 }
             };

     private static final Property<ViewBounds, PointF> BOTTOM_RIGHT_PROPERTY =
             new Property<ViewBounds, PointF>(PointF.class, "bottomRight") {
                 @Override
                 public void set(ViewBounds viewBounds, PointF bottomRight) {
                     viewBounds.setBottomRight(bottomRight);
                 }

                 @Override
                 public PointF get(ViewBounds viewBounds) {
                     return null;
                 }
             };

     @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
     private static final Property<View, PointF> BOTTOM_RIGHT_ONLY_PROPERTY =
             new Property<View, PointF>(PointF.class, "bottomRight") {
                 @Override
                 public void set(View view, PointF bottomRight) {
                     int left = view.getLeft();
                     int top = view.getTop();
                     int right = Math.round(bottomRight.x);
                     int bottom = Math.round(bottomRight.y);
                     view.setLeftTopRightBottom(left, top, right, bottom);
                 }

                 @Override
                 public PointF get(View view) {
                     return null;
                 }
             };

     private static final Property<View, PointF> TOP_LEFT_ONLY_PROPERTY =
             new Property<View, PointF>(PointF.class, "topLeft") {
                 @Override
                 public void set(View view, PointF topLeft) {
                     int left = Math.round(topLeft.x);
                     int top = Math.round(topLeft.y);
                     int right = view.getRight();
                     int bottom = view.getBottom();
                     view.setLeftTopRightBottom(left, top, right, bottom);
                 }

                 @Override
                 public PointF get(View view) {
                     return null;
                 }
             };

     @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
     private static final Property<View, PointF> POSITION_PROPERTY =
             new Property<View, PointF>(PointF.class, "position") {
                 @Override
                 public void set(View view, PointF topLeft) {
                     int left = Math.round(topLeft.x);
                     int top = Math.round(topLeft.y);
                     int right = left + view.getWidth();
                     int bottom = top + view.getHeight();
                     view.setLeftTopRightBottom(left, top, right, bottom);
                 }

                 @Override
                 public PointF get(View view) {
                     return null;
                 }
             };

     int[] tempLocation = new int[2];
     boolean mResizeClip = false;
     boolean mReparent = false;
     private static final String LOG_TAG = "ChangeBounds";

     private static RectEvaluator sRectEvaluator = new RectEvaluator();

     public ChangeBounds() {}

     public ChangeBounds(Context context, AttributeSet attrs) {
         super(context, attrs);

         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ChangeBounds);
         boolean resizeClip = a.getBoolean(R.styleable.ChangeBounds_resizeClip, false);
         a.recycle();
         setResizeClip(resizeClip);
     }

     @Override
     public String[] getTransitionProperties() {
         return sTransitionProperties;
     }

     /**
      * When <code>resizeClip</code> is true, ChangeBounds resizes the view using the clipBounds
      * instead of changing the dimensions of the view during the animation. When
      * <code>resizeClip</code> is false, ChangeBounds resizes the View by changing its dimensions.
      *
      * <p>When resizeClip is set to true, the clip bounds is modified by ChangeBounds. Therefore,
      * {@link android.transition.ChangeClipBounds} is not compatible with ChangeBounds
      * in this mode.</p>
      *
      * @param resizeClip Used to indicate whether the view bounds should be modified or the
      *                   clip bounds should be modified by ChangeBounds.
      * @see android.view.View#setClipBounds(android.graphics.Rect)
      * @attr ref android.R.styleable#ChangeBounds_resizeClip
      */
     public void setResizeClip(boolean resizeClip) {
         mResizeClip = resizeClip;
     }

     /**
      * Returns true when the ChangeBounds will resize by changing the clip bounds during the
      * view animation or false when bounds are changed. The default value is false.
      *
      * @return true when the ChangeBounds will resize by changing the clip bounds during the
      * view animation or false when bounds are changed. The default value is false.
      * @attr ref android.R.styleable#ChangeBounds_resizeClip
      */
     public boolean getResizeClip() {
         return mResizeClip;
     }

     /**
      * Setting this flag tells ChangeBounds to track the before/after parent
      * of every view using this transition. The flag is not enabled by
      * default because it requires the parent instances to be the same
      * in the two scenes or else all parents must use ids to allow
      * the transition to determine which parents are the same.
      *
      * @param reparent true if the transition should track the parent
      * container of target views and animate parent changes.
      * @deprecated Use {@link android.transition.ChangeTransform} to handle
      * transitions between different parents.
      */
     @Deprecated
     public void setReparent(boolean reparent) {
         mReparent = reparent;
     }

     private void captureValues(TransitionValues values) {
         View view = values.view;

         if (view.isLaidOut() || view.getWidth() != 0 || view.getHeight() != 0) {
             values.values.put(PROPNAME_BOUNDS, new Rect(view.getLeft(), view.getTop(),
                     view.getRight(), view.getBottom()));
             values.values.put(PROPNAME_PARENT, values.view.getParent());
             if (mReparent) {
                 values.view.getLocationInWindow(tempLocation);
                 values.values.put(PROPNAME_WINDOW_X, tempLocation[0]);
                 values.values.put(PROPNAME_WINDOW_Y, tempLocation[1]);
             }
             if (mResizeClip) {
                 values.values.put(PROPNAME_CLIP, view.getClipBounds());
             }
         }
     }

     @Override
     public void captureStartValues(TransitionValues transitionValues) {
         captureValues(transitionValues);
     }

     @Override
     public void captureEndValues(TransitionValues transitionValues) {
         captureValues(transitionValues);
     }

     private boolean parentMatches(View startParent, View endParent) {
         boolean parentMatches = true;
         if (mReparent) {
             TransitionValues endValues = getMatchedTransitionValues(startParent, true);
             if (endValues == null) {
                 parentMatches = startParent == endParent;
             } else {
                 parentMatches = endParent == endValues.view;
             }
         }
         return parentMatches;
     }

     @Nullable
     @Override
     public Animator createAnimator(@NonNull final ViewGroup sceneRoot,
             @Nullable TransitionValues startValues,
             @Nullable TransitionValues endValues) {
         if (startValues == null || endValues == null) {
             return null;
         }
         Map<String, Object> startParentVals = startValues.values;
         Map<String, Object> endParentVals = endValues.values;
         ViewGroup startParent = (ViewGroup) startParentVals.get(PROPNAME_PARENT);
         ViewGroup endParent = (ViewGroup) endParentVals.get(PROPNAME_PARENT);
         if (startParent == null || endParent == null) {
             return null;
         }
         final View view = endValues.view;
         if (parentMatches(startParent, endParent)) {
             Rect startBounds = (Rect) startValues.values.get(PROPNAME_BOUNDS);
             Rect endBounds = (Rect) endValues.values.get(PROPNAME_BOUNDS);
             final int startLeft = startBounds.left;
             final int endLeft = endBounds.left;
             final int startTop = startBounds.top;
             final int endTop = endBounds.top;
             final int startRight = startBounds.right;
             final int endRight = endBounds.right;
             final int startBottom = startBounds.bottom;
             final int endBottom = endBounds.bottom;
             final int startWidth = startRight - startLeft;
             final int startHeight = startBottom - startTop;
             final int endWidth = endRight - endLeft;
             final int endHeight = endBottom - endTop;
             Rect startClip = (Rect) startValues.values.get(PROPNAME_CLIP);
             Rect endClip = (Rect) endValues.values.get(PROPNAME_CLIP);
             int numChanges = 0;
             if ((startWidth != 0 && startHeight != 0) || (endWidth != 0 && endHeight != 0)) {
                 if (startLeft != endLeft || startTop != endTop) ++numChanges;
                 if (startRight != endRight || startBottom != endBottom) ++numChanges;
             }
             if ((startClip != null && !startClip.equals(endClip)) ||
                     (startClip == null && endClip != null)) {
                 ++numChanges;
             }
             if (numChanges > 0) {
                 if (view.getParent() instanceof ViewGroup) {
                     final ViewGroup parent = (ViewGroup) view.getParent();
                     parent.suppressLayout(true);
                     TransitionListener transitionListener = new TransitionListenerAdapter() {
                         boolean mCanceled = false;

                         @Override
                         public void onTransitionCancel(Transition transition) {
                             parent.suppressLayout(false);
                             mCanceled = true;
                         }

                         @Override
                         public void onTransitionEnd(Transition transition) {
                             if (!mCanceled) {
                                 parent.suppressLayout(false);
                             }
                             transition.removeListener(this);
                         }

                         @Override
                         public void onTransitionPause(Transition transition) {
                             parent.suppressLayout(false);
                         }

                         @Override
                         public void onTransitionResume(Transition transition) {
                             parent.suppressLayout(true);
                         }
                     };
                     addListener(transitionListener);
                 }
                 Animator anim;
                 if (!mResizeClip) {
                     view.setLeftTopRightBottom(startLeft, startTop, startRight, startBottom);
                     if (numChanges == 2) {
                         if (startWidth == endWidth && startHeight == endHeight) {
                             Path topLeftPath = getPathMotion().getPath(startLeft, startTop, endLeft,
                                     endTop);
                             anim = ObjectAnimator.ofObject(view, POSITION_PROPERTY, null,
                                     topLeftPath);
                         } else {
                             final ViewBounds viewBounds = new ViewBounds(view);
                             Path topLeftPath = getPathMotion().getPath(startLeft, startTop,
                                     endLeft, endTop);
                             ObjectAnimator topLeftAnimator = ObjectAnimator
                                     .ofObject(viewBounds, TOP_LEFT_PROPERTY, null, topLeftPath);

                             Path bottomRightPath = getPathMotion().getPath(startRight, startBottom,
                                     endRight, endBottom);
                             ObjectAnimator bottomRightAnimator = ObjectAnimator.ofObject(viewBounds,
                                     BOTTOM_RIGHT_PROPERTY, null, bottomRightPath);
                             AnimatorSet set = new AnimatorSet();
                             set.playTogether(topLeftAnimator, bottomRightAnimator);
                             anim = set;
                             set.addListener(new AnimatorListenerAdapter() {
                                 // We need a strong reference to viewBounds until the
                                 // animator ends.
                                 private ViewBounds mViewBounds = viewBounds;
                             });
                         }
                     } else if (startLeft != endLeft || startTop != endTop) {
                         Path topLeftPath = getPathMotion().getPath(startLeft, startTop,
                                 endLeft, endTop);
                         anim = ObjectAnimator.ofObject(view, TOP_LEFT_ONLY_PROPERTY, null,
                                 topLeftPath);
                     } else {
                         Path bottomRight = getPathMotion().getPath(startRight, startBottom,
                                 endRight, endBottom);
                         anim = ObjectAnimator.ofObject(view, BOTTOM_RIGHT_ONLY_PROPERTY, null,
                                 bottomRight);
                     }
                 } else {
                     int maxWidth = Math.max(startWidth, endWidth);
                     int maxHeight = Math.max(startHeight, endHeight);

                     view.setLeftTopRightBottom(startLeft, startTop, startLeft + maxWidth,
                             startTop + maxHeight);

                     ObjectAnimator positionAnimator = null;
                     if (startLeft != endLeft || startTop != endTop) {
                         Path topLeftPath = getPathMotion().getPath(startLeft, startTop, endLeft,
                                 endTop);
                         positionAnimator = ObjectAnimator.ofObject(view, POSITION_PROPERTY, null,
                                 topLeftPath);
                     }
                     final Rect finalClip = endClip;
                     if (startClip == null) {
                         startClip = new Rect(0, 0, startWidth, startHeight);
                     }
                     if (endClip == null) {
                         endClip = new Rect(0, 0, endWidth, endHeight);
                     }
                     ObjectAnimator clipAnimator = null;
                     if (!startClip.equals(endClip)) {
                         view.setClipBounds(startClip);
                         clipAnimator = ObjectAnimator.ofObject(view, "clipBounds", sRectEvaluator,
                                 startClip, endClip);
                         clipAnimator.addListener(new AnimatorListenerAdapter() {
                             private boolean mIsCanceled;

                             @Override
                             public void onAnimationCancel(Animator animation) {
                                 mIsCanceled = true;
                             }

                             @Override
                             public void onAnimationEnd(Animator animation) {
                                 if (!mIsCanceled) {
                                     view.setClipBounds(finalClip);
                                     view.setLeftTopRightBottom(endLeft, endTop, endRight,
                                             endBottom);
                                 }
                             }
                         });
                     }
                     anim = TransitionUtils.mergeAnimators(positionAnimator,
                             clipAnimator);
                 }
                 return anim;
             }
         } else {
             sceneRoot.getLocationInWindow(tempLocation);
             int startX = (Integer) startValues.values.get(PROPNAME_WINDOW_X) - tempLocation[0];
             int startY = (Integer) startValues.values.get(PROPNAME_WINDOW_Y) - tempLocation[1];
             int endX = (Integer) endValues.values.get(PROPNAME_WINDOW_X) - tempLocation[0];
             int endY = (Integer) endValues.values.get(PROPNAME_WINDOW_Y) - tempLocation[1];
             // TODO: also handle size changes: check bounds and animate size changes
             if (startX != endX || startY != endY) {
                 final int width = view.getWidth();
                 final int height = view.getHeight();
                 Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
                 Canvas canvas = new Canvas(bitmap);
                 view.draw(canvas);
                 final BitmapDrawable drawable = new BitmapDrawable(bitmap);
                 drawable.setBounds(startX, startY, startX + width, startY + height);
                 final float transitionAlpha = view.getTransitionAlpha();
                 view.setTransitionAlpha(0);
                 sceneRoot.getOverlay().add(drawable);
                 Path topLeftPath = getPathMotion().getPath(startX, startY, endX, endY);
                 PropertyValuesHolder origin = PropertyValuesHolder.ofObject(
                         DRAWABLE_ORIGIN_PROPERTY, null, topLeftPath);
                 ObjectAnimator anim = ObjectAnimator.ofPropertyValuesHolder(drawable, origin);
                 anim.addListener(new AnimatorListenerAdapter() {
                     @Override
                     public void onAnimationEnd(Animator animation) {
                         sceneRoot.getOverlay().remove(drawable);
                         view.setTransitionAlpha(transitionAlpha);
                     }
                 });
                 return anim;
             }
         }
         return null;
     }

     private static class ViewBounds {
         private int mLeft;
         private int mTop;
         private int mRight;
         private int mBottom;
         private View mView;
         private int mTopLeftCalls;
         private int mBottomRightCalls;

         public ViewBounds(View view) {
             mView = view;
         }

         public void setTopLeft(PointF topLeft) {
             mLeft = Math.round(topLeft.x);
             mTop = Math.round(topLeft.y);
             mTopLeftCalls++;
             if (mTopLeftCalls == mBottomRightCalls) {
                 setLeftTopRightBottom();
             }
         }

         public void setBottomRight(PointF bottomRight) {
             mRight = Math.round(bottomRight.x);
             mBottom = Math.round(bottomRight.y);
             mBottomRightCalls++;
             if (mTopLeftCalls == mBottomRightCalls) {
                 setLeftTopRightBottom();
             }
         }

         private void setLeftTopRightBottom() {
             mView.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom);
             mTopLeftCalls = 0;
             mBottomRightCalls = 0;
         }
     }
 }
	/*
	* Copyright (C) 2013 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 android.transition;

	import android.animation.Animator;
	import android.animation.AnimatorListenerAdapter;
	import android.animation.AnimatorSet;
	import android.animation.ObjectAnimator;
	import android.animation.PropertyValuesHolder;
	import android.animation.RectEvaluator;
	import android.annotation.NonNull;
	import android.annotation.Nullable;
	import android.compat.annotation.UnsupportedAppUsage;
	import android.content.Context;
	import android.content.res.TypedArray;
	import android.graphics.Bitmap;
	import android.graphics.Canvas;
	import android.graphics.Path;
	import android.graphics.PointF;
	import android.graphics.Rect;
	import android.graphics.drawable.BitmapDrawable;
	import android.graphics.drawable.Drawable;
	import android.os.Build;
	import android.util.AttributeSet;
	import android.util.Property;
	import android.view.View;
	import android.view.ViewGroup;

	import com.android.internal.R;

	import java.util.Map;

	/**
	* This transition captures the layout bounds of target views before and after
	* the scene change and animates those changes during the transition.
	*
	* <p>A ChangeBounds transition can be described in a resource file by using the
	* tag <code>changeBounds</code>, using its attributes of
	* {@link android.R.styleable#ChangeBounds} along with the other standard
	* attributes of {@link android.R.styleable#Transition}.</p>
	*/
	public class ChangeBounds extends Transition {

	private static final String PROPNAME_BOUNDS = "android:changeBounds:bounds";
	private static final String PROPNAME_CLIP = "android:changeBounds:clip";
	private static final String PROPNAME_PARENT = "android:changeBounds:parent";
	private static final String PROPNAME_WINDOW_X = "android:changeBounds:windowX";
	private static final String PROPNAME_WINDOW_Y = "android:changeBounds:windowY";
	private static final String[] sTransitionProperties = {
	PROPNAME_BOUNDS,
	PROPNAME_CLIP,
	PROPNAME_PARENT,
	PROPNAME_WINDOW_X,
	PROPNAME_WINDOW_Y
	};

	private static final Property<Drawable, PointF> DRAWABLE_ORIGIN_PROPERTY =
	new Property<Drawable, PointF>(PointF.class, "boundsOrigin") {
	private Rect mBounds = new Rect();

	@Override
	public void set(Drawable object, PointF value) {
	object.copyBounds(mBounds);
	mBounds.offsetTo(Math.round(value.x), Math.round(value.y));
	object.setBounds(mBounds);
	}

	@Override
	public PointF get(Drawable object) {
	object.copyBounds(mBounds);
	return new PointF(mBounds.left, mBounds.top);
	}
	};

	private static final Property<ViewBounds, PointF> TOP_LEFT_PROPERTY =
	new Property<ViewBounds, PointF>(PointF.class, "topLeft") {
	@Override
	public void set(ViewBounds viewBounds, PointF topLeft) {
	viewBounds.setTopLeft(topLeft);
	}

	@Override
	public PointF get(ViewBounds viewBounds) {
	return null;
	}
	};

	private static final Property<ViewBounds, PointF> BOTTOM_RIGHT_PROPERTY =
	new Property<ViewBounds, PointF>(PointF.class, "bottomRight") {
	@Override
	public void set(ViewBounds viewBounds, PointF bottomRight) {
	viewBounds.setBottomRight(bottomRight);
	}

	@Override
	public PointF get(ViewBounds viewBounds) {
	return null;
	}
	};

	@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
	private static final Property<View, PointF> BOTTOM_RIGHT_ONLY_PROPERTY =
	new Property<View, PointF>(PointF.class, "bottomRight") {
	@Override
	public void set(View view, PointF bottomRight) {
	int left = view.getLeft();
	int top = view.getTop();
	int right = Math.round(bottomRight.x);
	int bottom = Math.round(bottomRight.y);
	view.setLeftTopRightBottom(left, top, right, bottom);
	}

	@Override
	public PointF get(View view) {
	return null;
	}
	};

	private static final Property<View, PointF> TOP_LEFT_ONLY_PROPERTY =
	new Property<View, PointF>(PointF.class, "topLeft") {
	@Override
	public void set(View view, PointF topLeft) {
	int left = Math.round(topLeft.x);
	int top = Math.round(topLeft.y);
	int right = view.getRight();
	int bottom = view.getBottom();
	view.setLeftTopRightBottom(left, top, right, bottom);
	}

	@Override
	public PointF get(View view) {
	return null;
	}
	};

	@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
	private static final Property<View, PointF> POSITION_PROPERTY =
	new Property<View, PointF>(PointF.class, "position") {
	@Override
	public void set(View view, PointF topLeft) {
	int left = Math.round(topLeft.x);
	int top = Math.round(topLeft.y);
	int right = left + view.getWidth();
	int bottom = top + view.getHeight();
	view.setLeftTopRightBottom(left, top, right, bottom);
	}

	@Override
	public PointF get(View view) {
	return null;
	}
	};

	int[] tempLocation = new int[2];
	boolean mResizeClip = false;
	boolean mReparent = false;
	private static final String LOG_TAG = "ChangeBounds";

	private static RectEvaluator sRectEvaluator = new RectEvaluator();

	public ChangeBounds() {}

	public ChangeBounds(Context context, AttributeSet attrs) {
	super(context, attrs);

	TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ChangeBounds);
	boolean resizeClip = a.getBoolean(R.styleable.ChangeBounds_resizeClip, false);
	a.recycle();
	setResizeClip(resizeClip);
	}

	@Override
	public String[] getTransitionProperties() {
	return sTransitionProperties;
	}

	/**
	* When <code>resizeClip</code> is true, ChangeBounds resizes the view using the clipBounds
	* instead of changing the dimensions of the view during the animation. When
	* <code>resizeClip</code> is false, ChangeBounds resizes the View by changing its dimensions.
	*
	* <p>When resizeClip is set to true, the clip bounds is modified by ChangeBounds. Therefore,
	* {@link android.transition.ChangeClipBounds} is not compatible with ChangeBounds
	* in this mode.</p>
	*
	* @param resizeClip Used to indicate whether the view bounds should be modified or the
	* clip bounds should be modified by ChangeBounds.
	* @see android.view.View#setClipBounds(android.graphics.Rect)
	* @attr ref android.R.styleable#ChangeBounds_resizeClip
	*/
	public void setResizeClip(boolean resizeClip) {
	mResizeClip = resizeClip;
	}

	/**
	* Returns true when the ChangeBounds will resize by changing the clip bounds during the
	* view animation or false when bounds are changed. The default value is false.
	*
	* @return true when the ChangeBounds will resize by changing the clip bounds during the
	* view animation or false when bounds are changed. The default value is false.
	* @attr ref android.R.styleable#ChangeBounds_resizeClip
	*/
	public boolean getResizeClip() {
	return mResizeClip;
	}

	/**
	* Setting this flag tells ChangeBounds to track the before/after parent
	* of every view using this transition. The flag is not enabled by
	* default because it requires the parent instances to be the same
	* in the two scenes or else all parents must use ids to allow
	* the transition to determine which parents are the same.
	*
	* @param reparent true if the transition should track the parent
	* container of target views and animate parent changes.
	* @deprecated Use {@link android.transition.ChangeTransform} to handle
	* transitions between different parents.
	*/
	@Deprecated
	public void setReparent(boolean reparent) {
	mReparent = reparent;
	}

	private void captureValues(TransitionValues values) {
	View view = values.view;

	if (view.isLaidOut() \|\| view.getWidth() != 0 \|\| view.getHeight() != 0) {
	values.values.put(PROPNAME_BOUNDS, new Rect(view.getLeft(), view.getTop(),
	view.getRight(), view.getBottom()));
	values.values.put(PROPNAME_PARENT, values.view.getParent());
	if (mReparent) {
	values.view.getLocationInWindow(tempLocation);
	values.values.put(PROPNAME_WINDOW_X, tempLocation[0]);
	values.values.put(PROPNAME_WINDOW_Y, tempLocation[1]);
	}
	if (mResizeClip) {
	values.values.put(PROPNAME_CLIP, view.getClipBounds());
	}
	}
	}

	@Override
	public void captureStartValues(TransitionValues transitionValues) {
	captureValues(transitionValues);
	}

	@Override
	public void captureEndValues(TransitionValues transitionValues) {
	captureValues(transitionValues);
	}

	private boolean parentMatches(View startParent, View endParent) {
	boolean parentMatches = true;
	if (mReparent) {
	TransitionValues endValues = getMatchedTransitionValues(startParent, true);
	if (endValues == null) {
	parentMatches = startParent == endParent;
	} else {
	parentMatches = endParent == endValues.view;
	}
	}
	return parentMatches;
	}

	@Nullable
	@Override
	public Animator createAnimator(@NonNull final ViewGroup sceneRoot,
	@Nullable TransitionValues startValues,
	@Nullable TransitionValues endValues) {
	if (startValues == null \|\| endValues == null) {
	return null;
	}
	Map<String, Object> startParentVals = startValues.values;
	Map<String, Object> endParentVals = endValues.values;
	ViewGroup startParent = (ViewGroup) startParentVals.get(PROPNAME_PARENT);
	ViewGroup endParent = (ViewGroup) endParentVals.get(PROPNAME_PARENT);
	if (startParent == null \|\| endParent == null) {
	return null;
	}
	final View view = endValues.view;
	if (parentMatches(startParent, endParent)) {
	Rect startBounds = (Rect) startValues.values.get(PROPNAME_BOUNDS);
	Rect endBounds = (Rect) endValues.values.get(PROPNAME_BOUNDS);
	final int startLeft = startBounds.left;
	final int endLeft = endBounds.left;
	final int startTop = startBounds.top;
	final int endTop = endBounds.top;
	final int startRight = startBounds.right;
	final int endRight = endBounds.right;
	final int startBottom = startBounds.bottom;
	final int endBottom = endBounds.bottom;
	final int startWidth = startRight - startLeft;
	final int startHeight = startBottom - startTop;
	final int endWidth = endRight - endLeft;
	final int endHeight = endBottom - endTop;
	Rect startClip = (Rect) startValues.values.get(PROPNAME_CLIP);
	Rect endClip = (Rect) endValues.values.get(PROPNAME_CLIP);
	int numChanges = 0;
	if ((startWidth != 0 && startHeight != 0) \|\| (endWidth != 0 && endHeight != 0)) {
	if (startLeft != endLeft \|\| startTop != endTop) ++numChanges;
	if (startRight != endRight \|\| startBottom != endBottom) ++numChanges;
	}
	if ((startClip != null && !startClip.equals(endClip)) \|\|
	(startClip == null && endClip != null)) {
	++numChanges;
	}
	if (numChanges > 0) {
	if (view.getParent() instanceof ViewGroup) {
	final ViewGroup parent = (ViewGroup) view.getParent();
	parent.suppressLayout(true);
	TransitionListener transitionListener = new TransitionListenerAdapter() {
	boolean mCanceled = false;

	@Override
	public void onTransitionCancel(Transition transition) {
	parent.suppressLayout(false);
	mCanceled = true;
	}

	@Override
	public void onTransitionEnd(Transition transition) {
	if (!mCanceled) {
	parent.suppressLayout(false);
	}
	transition.removeListener(this);
	}

	@Override
	public void onTransitionPause(Transition transition) {
	parent.suppressLayout(false);
	}

	@Override
	public void onTransitionResume(Transition transition) {
	parent.suppressLayout(true);
	}
	};
	addListener(transitionListener);
	}
	Animator anim;
	if (!mResizeClip) {
	view.setLeftTopRightBottom(startLeft, startTop, startRight, startBottom);
	if (numChanges == 2) {
	if (startWidth == endWidth && startHeight == endHeight) {
	Path topLeftPath = getPathMotion().getPath(startLeft, startTop, endLeft,
	endTop);
	anim = ObjectAnimator.ofObject(view, POSITION_PROPERTY, null,
	topLeftPath);
	} else {
	final ViewBounds viewBounds = new ViewBounds(view);
	Path topLeftPath = getPathMotion().getPath(startLeft, startTop,
	endLeft, endTop);
	ObjectAnimator topLeftAnimator = ObjectAnimator
	.ofObject(viewBounds, TOP_LEFT_PROPERTY, null, topLeftPath);

	Path bottomRightPath = getPathMotion().getPath(startRight, startBottom,
	endRight, endBottom);
	ObjectAnimator bottomRightAnimator = ObjectAnimator.ofObject(viewBounds,
	BOTTOM_RIGHT_PROPERTY, null, bottomRightPath);
	AnimatorSet set = new AnimatorSet();
	set.playTogether(topLeftAnimator, bottomRightAnimator);
	anim = set;
	set.addListener(new AnimatorListenerAdapter() {
	// We need a strong reference to viewBounds until the
	// animator ends.
	private ViewBounds mViewBounds = viewBounds;
	});
	}
	} else if (startLeft != endLeft \|\| startTop != endTop) {
	Path topLeftPath = getPathMotion().getPath(startLeft, startTop,
	endLeft, endTop);
	anim = ObjectAnimator.ofObject(view, TOP_LEFT_ONLY_PROPERTY, null,
	topLeftPath);
	} else {
	Path bottomRight = getPathMotion().getPath(startRight, startBottom,
	endRight, endBottom);
	anim = ObjectAnimator.ofObject(view, BOTTOM_RIGHT_ONLY_PROPERTY, null,
	bottomRight);
	}
	} else {
	int maxWidth = Math.max(startWidth, endWidth);
	int maxHeight = Math.max(startHeight, endHeight);

	view.setLeftTopRightBottom(startLeft, startTop, startLeft + maxWidth,
	startTop + maxHeight);

	ObjectAnimator positionAnimator = null;
	if (startLeft != endLeft \|\| startTop != endTop) {
	Path topLeftPath = getPathMotion().getPath(startLeft, startTop, endLeft,
	endTop);
	positionAnimator = ObjectAnimator.ofObject(view, POSITION_PROPERTY, null,
	topLeftPath);
	}
	final Rect finalClip = endClip;
	if (startClip == null) {
	startClip = new Rect(0, 0, startWidth, startHeight);
	}
	if (endClip == null) {
	endClip = new Rect(0, 0, endWidth, endHeight);
	}
	ObjectAnimator clipAnimator = null;
	if (!startClip.equals(endClip)) {
	view.setClipBounds(startClip);
	clipAnimator = ObjectAnimator.ofObject(view, "clipBounds", sRectEvaluator,
	startClip, endClip);
	clipAnimator.addListener(new AnimatorListenerAdapter() {
	private boolean mIsCanceled;

	@Override
	public void onAnimationCancel(Animator animation) {
	mIsCanceled = true;
	}

	@Override
	public void onAnimationEnd(Animator animation) {
	if (!mIsCanceled) {
	view.setClipBounds(finalClip);
	view.setLeftTopRightBottom(endLeft, endTop, endRight,
	endBottom);
	}
	}
	});
	}
	anim = TransitionUtils.mergeAnimators(positionAnimator,
	clipAnimator);
	}
	return anim;
	}
	} else {
	sceneRoot.getLocationInWindow(tempLocation);
	int startX = (Integer) startValues.values.get(PROPNAME_WINDOW_X) - tempLocation[0];
	int startY = (Integer) startValues.values.get(PROPNAME_WINDOW_Y) - tempLocation[1];
	int endX = (Integer) endValues.values.get(PROPNAME_WINDOW_X) - tempLocation[0];
	int endY = (Integer) endValues.values.get(PROPNAME_WINDOW_Y) - tempLocation[1];
	// TODO: also handle size changes: check bounds and animate size changes
	if (startX != endX \|\| startY != endY) {
	final int width = view.getWidth();
	final int height = view.getHeight();
	Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
	Canvas canvas = new Canvas(bitmap);
	view.draw(canvas);
	final BitmapDrawable drawable = new BitmapDrawable(bitmap);
	drawable.setBounds(startX, startY, startX + width, startY + height);
	final float transitionAlpha = view.getTransitionAlpha();
	view.setTransitionAlpha(0);
	sceneRoot.getOverlay().add(drawable);
	Path topLeftPath = getPathMotion().getPath(startX, startY, endX, endY);
	PropertyValuesHolder origin = PropertyValuesHolder.ofObject(
	DRAWABLE_ORIGIN_PROPERTY, null, topLeftPath);
	ObjectAnimator anim = ObjectAnimator.ofPropertyValuesHolder(drawable, origin);
	anim.addListener(new AnimatorListenerAdapter() {
	@Override
	public void onAnimationEnd(Animator animation) {
	sceneRoot.getOverlay().remove(drawable);
	view.setTransitionAlpha(transitionAlpha);
	}
	});
	return anim;
	}
	}
	return null;
	}

	private static class ViewBounds {
	private int mLeft;
	private int mTop;
	private int mRight;
	private int mBottom;
	private View mView;
	private int mTopLeftCalls;
	private int mBottomRightCalls;

	public ViewBounds(View view) {
	mView = view;
	}

	public void setTopLeft(PointF topLeft) {
	mLeft = Math.round(topLeft.x);
	mTop = Math.round(topLeft.y);
	mTopLeftCalls++;
	if (mTopLeftCalls == mBottomRightCalls) {
	setLeftTopRightBottom();
	}
	}

	public void setBottomRight(PointF bottomRight) {
	mRight = Math.round(bottomRight.x);
	mBottom = Math.round(bottomRight.y);
	mBottomRightCalls++;
	if (mTopLeftCalls == mBottomRightCalls) {
	setLeftTopRightBottom();
	}
	}

	private void setLeftTopRightBottom() {
	mView.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom);
	mTopLeftCalls = 0;
	mBottomRightCalls = 0;
	}
	}
	}