transition/api14/android/support/transition/ViewOverlayApi14.java - platform/frameworks/support - Git at Google

 /*
  * Copyright (C) 2016 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.support.transition;

 import static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP;

 import android.content.Context;
 import android.graphics.Canvas;
 import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 import android.support.annotation.NonNull;
 import android.support.annotation.RequiresApi;
 import android.support.annotation.RestrictTo;
 import android.support.v4.view.ViewCompat;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.ViewParent;

 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.util.ArrayList;

 @RequiresApi(14)
 class ViewOverlayApi14 implements ViewOverlayImpl {

     /**
      * The actual container for the drawables (and views, if it's a ViewGroupOverlay).
      * All of the management and rendering details for the overlay are handled in
      * OverlayViewGroup.
      */
     protected OverlayViewGroup mOverlayViewGroup;

     ViewOverlayApi14(Context context, ViewGroup hostView, View requestingView) {
         mOverlayViewGroup = new OverlayViewGroup(context, hostView, requestingView, this);
     }

     static ViewGroup getContentView(View view) {
         View parent = view;
         while (parent != null) {
             if (parent.getId() == android.R.id.content && parent instanceof ViewGroup) {
                 return (ViewGroup) parent;
             }
             if (parent.getParent() instanceof ViewGroup) {
                 parent = (ViewGroup) parent.getParent();
             }
         }
         return null;
     }

     static ViewOverlayApi14 createFrom(View view) {
         ViewGroup contentView = getContentView(view);
         if (contentView != null) {
             final int numChildren = contentView.getChildCount();
             for (int i = 0; i < numChildren; ++i) {
                 View child = contentView.getChildAt(i);
                 if (child instanceof OverlayViewGroup) {
                     return ((OverlayViewGroup) child).mViewOverlay;
                 }
             }
             return new ViewGroupOverlayApi14(contentView.getContext(), contentView, view);
         }
         return null;
     }

     /**
      * Used internally by View and ViewGroup to handle drawing and invalidation
      * of the overlay
      */
     ViewGroup getOverlayView() {
         return mOverlayViewGroup;
     }

     @Override
     public void add(@NonNull Drawable drawable) {
         mOverlayViewGroup.add(drawable);
     }

     @Override
     public void clear() {
         mOverlayViewGroup.clear();
     }

     @Override
     public void remove(@NonNull Drawable drawable) {
         mOverlayViewGroup.remove(drawable);
     }

     boolean isEmpty() {
         return mOverlayViewGroup.isEmpty();
     }


     /**
      * OverlayViewGroup is a container that View and ViewGroup use to host
      * drawables and views added to their overlays  ({@code ViewOverlay} and
      * {@code ViewGroupOverlay}, respectively). Drawables are added to the overlay
      * via the add/remove methods in ViewOverlay, Views are added/removed via
      * ViewGroupOverlay. These drawable and view objects are
      * drawn whenever the view itself is drawn; first the view draws its own
      * content (and children, if it is a ViewGroup), then it draws its overlay
      * (if it has one).
      *
      * <p>Besides managing and drawing the list of drawables, this class serves
      * two purposes:
      * (1) it noops layout calls because children are absolutely positioned and
      * (2) it forwards all invalidation calls to its host view. The invalidation
      * redirect is necessary because the overlay is not a child of the host view
      * and invalidation cannot therefore follow the normal path up through the
      * parent hierarchy.</p>
      *
      * @see View#getOverlay()
      * @see ViewGroup#getOverlay()
      */
     static class OverlayViewGroup extends ViewGroup {

         static Method sInvalidateChildInParentFastMethod;

         static {
             try {
                 sInvalidateChildInParentFastMethod = ViewGroup.class.getDeclaredMethod(
                         "invalidateChildInParentFast", int.class, int.class, Rect.class);
             } catch (NoSuchMethodException e) {
             }

         }

         /**
          * The View for which this is an overlay. Invalidations of the overlay are redirected to
          * this host view.
          */
         ViewGroup mHostView;
         View mRequestingView;
         /**
          * The set of drawables to draw when the overlay is rendered.
          */
         ArrayList<Drawable> mDrawables = null;
         /**
          * Reference to the hosting overlay object
          */
         ViewOverlayApi14 mViewOverlay;

         OverlayViewGroup(Context context, ViewGroup hostView, View requestingView,
                 ViewOverlayApi14 viewOverlay) {
             super(context);
             mHostView = hostView;
             mRequestingView = requestingView;
             setRight(hostView.getWidth());
             setBottom(hostView.getHeight());
             hostView.addView(this);
             mViewOverlay = viewOverlay;
         }

         @Override
         public boolean dispatchTouchEvent(MotionEvent ev) {
             // Intercept and noop all touch events - overlays do not allow touch events
             return false;
         }

         public void add(Drawable drawable) {
             if (mDrawables == null) {

                 mDrawables = new ArrayList<>();
             }
             if (!mDrawables.contains(drawable)) {
                 // Make each drawable unique in the overlay; can't add it more than once
                 mDrawables.add(drawable);
                 invalidate(drawable.getBounds());
                 drawable.setCallback(this);
             }
         }

         public void remove(Drawable drawable) {
             if (mDrawables != null) {
                 mDrawables.remove(drawable);
                 invalidate(drawable.getBounds());
                 drawable.setCallback(null);
             }
         }

         @Override
         protected boolean verifyDrawable(@NonNull Drawable who) {
             return super.verifyDrawable(who) || (mDrawables != null && mDrawables.contains(who));
         }

         public void add(View child) {
             if (child.getParent() instanceof ViewGroup) {
                 ViewGroup parent = (ViewGroup) child.getParent();
                 if (parent != mHostView && parent.getParent() != null
                         && ViewCompat.isAttachedToWindow(parent)) {
                     // Moving to different container; figure out how to position child such that
                     // it is in the same location on the screen
                     int[] parentLocation = new int[2];
                     int[] hostViewLocation = new int[2];
                     parent.getLocationOnScreen(parentLocation);
                     mHostView.getLocationOnScreen(hostViewLocation);
                     ViewCompat.offsetLeftAndRight(child, parentLocation[0] - hostViewLocation[0]);
                     ViewCompat.offsetTopAndBottom(child, parentLocation[1] - hostViewLocation[1]);
                 }
                 parent.removeView(child);
 //                if (parent.getLayoutTransition() != null) {
 //                    // LayoutTransition will cause the child to delay removal - cancel it
 //                    parent.getLayoutTransition().cancel(LayoutTransition.DISAPPEARING);
 //                }
                 // fail-safe if view is still attached for any reason
                 if (child.getParent() != null) {
                     parent.removeView(child);
                 }
             }
             super.addView(child, getChildCount() - 1);
         }

         public void remove(View view) {
             super.removeView(view);
             if (isEmpty()) {
                 mHostView.removeView(this);
             }
         }

         public void clear() {
             removeAllViews();
             if (mDrawables != null) {
                 mDrawables.clear();
             }
         }

         boolean isEmpty() {
             return getChildCount() == 0
                     && (mDrawables == null || mDrawables.size() == 0);
         }

         @Override
         public void invalidateDrawable(@NonNull Drawable drawable) {
             invalidate(drawable.getBounds());
         }

         @Override
         protected void dispatchDraw(Canvas canvas) {
             int[] contentViewLocation = new int[2];
             int[] hostViewLocation = new int[2];
             mHostView.getLocationOnScreen(contentViewLocation);
             mRequestingView.getLocationOnScreen(hostViewLocation);
             canvas.translate(hostViewLocation[0] - contentViewLocation[0],
                     hostViewLocation[1] - contentViewLocation[1]);
             canvas.clipRect(
                     new Rect(0, 0, mRequestingView.getWidth(), mRequestingView.getHeight()));
             super.dispatchDraw(canvas);
             final int numDrawables = (mDrawables == null) ? 0 : mDrawables.size();
             for (int i = 0; i < numDrawables; ++i) {
                 mDrawables.get(i).draw(canvas);
             }
         }

         @Override
         protected void onLayout(boolean changed, int l, int t, int r, int b) {
             // Noop: children are positioned absolutely
         }

         /*
          The following invalidation overrides exist for the purpose of redirecting invalidation to
          the host view. The overlay is not parented to the host view (since a View cannot be a
          parent), so the invalidation cannot proceed through the normal parent hierarchy.
          There is a built-in assumption that the overlay exactly covers the host view, therefore
          the invalidation rectangles received do not need to be adjusted when forwarded to
          the host view.
          */

         private void getOffset(int[] offset) {
             int[] contentViewLocation = new int[2];
             int[] hostViewLocation = new int[2];
             mHostView.getLocationOnScreen(contentViewLocation);
             mRequestingView.getLocationOnScreen(hostViewLocation);
             offset[0] = hostViewLocation[0] - contentViewLocation[0];
             offset[1] = hostViewLocation[1] - contentViewLocation[1];
         }

         public void invalidateChildFast(View child, final Rect dirty) {
             if (mHostView != null) {
                 // Note: This is not a "fast" invalidation. Would be nice to instead invalidate
                 // using DisplayList properties and a dirty rect instead of causing a real
                 // invalidation of the host view
                 int left = child.getLeft();
                 int top = child.getTop();
                 int[] offset = new int[2];
                 getOffset(offset);
                 // TODO: implement transforms
 //                if (!child.getMatrix().isIdentity()) {
 //                    child.transformRect(dirty);
 //                }
                 dirty.offset(left + offset[0], top + offset[1]);
                 mHostView.invalidate(dirty);
             }
         }

         /**
          * @hide
          */
         @RestrictTo(LIBRARY_GROUP)
         protected ViewParent invalidateChildInParentFast(int left, int top, Rect dirty) {
             if (mHostView instanceof ViewGroup && sInvalidateChildInParentFastMethod != null) {
                 try {
                     int[] offset = new int[2];
                     getOffset(offset);
                     sInvalidateChildInParentFastMethod.invoke(mHostView, left, top, dirty);
                 } catch (IllegalAccessException e) {
                     e.printStackTrace();
                 } catch (InvocationTargetException e) {
                     e.printStackTrace();
                 }
             }
             return null;
         }

         @SuppressWarnings("deprecation")
         @Override
         public ViewParent invalidateChildInParent(int[] location, Rect dirty) {
             if (mHostView != null) {
                 dirty.offset(location[0], location[1]);
                 if (mHostView instanceof ViewGroup) {
                     location[0] = 0;
                     location[1] = 0;
                     int[] offset = new int[2];
                     getOffset(offset);
                     dirty.offset(offset[0], offset[1]);
                     return super.invalidateChildInParent(location, dirty);
 //                    return ((ViewGroup) mHostView).invalidateChildInParent(location, dirty);
                 } else {
                     invalidate(dirty);
                 }
             }
             return null;
         }

         static class TouchInterceptor extends View {
             TouchInterceptor(Context context) {
                 super(context);
             }
         }
     }


 }
	/*
	* Copyright (C) 2016 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.support.transition;

	import static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP;

	import android.content.Context;
	import android.graphics.Canvas;
	import android.graphics.Rect;
	import android.graphics.drawable.Drawable;
	import android.support.annotation.NonNull;
	import android.support.annotation.RequiresApi;
	import android.support.annotation.RestrictTo;
	import android.support.v4.view.ViewCompat;
	import android.view.MotionEvent;
	import android.view.View;
	import android.view.ViewGroup;
	import android.view.ViewParent;

	import java.lang.reflect.InvocationTargetException;
	import java.lang.reflect.Method;
	import java.util.ArrayList;

	@RequiresApi(14)
	class ViewOverlayApi14 implements ViewOverlayImpl {

	/**
	* The actual container for the drawables (and views, if it's a ViewGroupOverlay).
	* All of the management and rendering details for the overlay are handled in
	* OverlayViewGroup.
	*/
	protected OverlayViewGroup mOverlayViewGroup;

	ViewOverlayApi14(Context context, ViewGroup hostView, View requestingView) {
	mOverlayViewGroup = new OverlayViewGroup(context, hostView, requestingView, this);
	}

	static ViewGroup getContentView(View view) {
	View parent = view;
	while (parent != null) {
	if (parent.getId() == android.R.id.content && parent instanceof ViewGroup) {
	return (ViewGroup) parent;
	}
	if (parent.getParent() instanceof ViewGroup) {
	parent = (ViewGroup) parent.getParent();
	}
	}
	return null;
	}

	static ViewOverlayApi14 createFrom(View view) {
	ViewGroup contentView = getContentView(view);
	if (contentView != null) {
	final int numChildren = contentView.getChildCount();
	for (int i = 0; i < numChildren; ++i) {
	View child = contentView.getChildAt(i);
	if (child instanceof OverlayViewGroup) {
	return ((OverlayViewGroup) child).mViewOverlay;
	}
	}
	return new ViewGroupOverlayApi14(contentView.getContext(), contentView, view);
	}
	return null;
	}

	/**
	* Used internally by View and ViewGroup to handle drawing and invalidation
	* of the overlay
	*/
	ViewGroup getOverlayView() {
	return mOverlayViewGroup;
	}

	@Override
	public void add(@NonNull Drawable drawable) {
	mOverlayViewGroup.add(drawable);
	}

	@Override
	public void clear() {
	mOverlayViewGroup.clear();
	}

	@Override
	public void remove(@NonNull Drawable drawable) {
	mOverlayViewGroup.remove(drawable);
	}

	boolean isEmpty() {
	return mOverlayViewGroup.isEmpty();
	}


	/**
	* OverlayViewGroup is a container that View and ViewGroup use to host
	* drawables and views added to their overlays ({@code ViewOverlay} and
	* {@code ViewGroupOverlay}, respectively). Drawables are added to the overlay
	* via the add/remove methods in ViewOverlay, Views are added/removed via
	* ViewGroupOverlay. These drawable and view objects are
	* drawn whenever the view itself is drawn; first the view draws its own
	* content (and children, if it is a ViewGroup), then it draws its overlay
	* (if it has one).
	*
	* <p>Besides managing and drawing the list of drawables, this class serves
	* two purposes:
	* (1) it noops layout calls because children are absolutely positioned and
	* (2) it forwards all invalidation calls to its host view. The invalidation
	* redirect is necessary because the overlay is not a child of the host view
	* and invalidation cannot therefore follow the normal path up through the
	* parent hierarchy.</p>
	*
	* @see View#getOverlay()
	* @see ViewGroup#getOverlay()
	*/
	static class OverlayViewGroup extends ViewGroup {

	static Method sInvalidateChildInParentFastMethod;

	static {
	try {
	sInvalidateChildInParentFastMethod = ViewGroup.class.getDeclaredMethod(
	"invalidateChildInParentFast", int.class, int.class, Rect.class);
	} catch (NoSuchMethodException e) {
	}

	}

	/**
	* The View for which this is an overlay. Invalidations of the overlay are redirected to
	* this host view.
	*/
	ViewGroup mHostView;
	View mRequestingView;
	/**
	* The set of drawables to draw when the overlay is rendered.
	*/
	ArrayList<Drawable> mDrawables = null;
	/**
	* Reference to the hosting overlay object
	*/
	ViewOverlayApi14 mViewOverlay;

	OverlayViewGroup(Context context, ViewGroup hostView, View requestingView,
	ViewOverlayApi14 viewOverlay) {
	super(context);
	mHostView = hostView;
	mRequestingView = requestingView;
	setRight(hostView.getWidth());
	setBottom(hostView.getHeight());
	hostView.addView(this);
	mViewOverlay = viewOverlay;
	}

	@Override
	public boolean dispatchTouchEvent(MotionEvent ev) {
	// Intercept and noop all touch events - overlays do not allow touch events
	return false;
	}

	public void add(Drawable drawable) {
	if (mDrawables == null) {

	mDrawables = new ArrayList<>();
	}
	if (!mDrawables.contains(drawable)) {
	// Make each drawable unique in the overlay; can't add it more than once
	mDrawables.add(drawable);
	invalidate(drawable.getBounds());
	drawable.setCallback(this);
	}
	}

	public void remove(Drawable drawable) {
	if (mDrawables != null) {
	mDrawables.remove(drawable);
	invalidate(drawable.getBounds());
	drawable.setCallback(null);
	}
	}

	@Override
	protected boolean verifyDrawable(@NonNull Drawable who) {
	return super.verifyDrawable(who) \|\| (mDrawables != null && mDrawables.contains(who));
	}

	public void add(View child) {
	if (child.getParent() instanceof ViewGroup) {
	ViewGroup parent = (ViewGroup) child.getParent();
	if (parent != mHostView && parent.getParent() != null
	&& ViewCompat.isAttachedToWindow(parent)) {
	// Moving to different container; figure out how to position child such that
	// it is in the same location on the screen
	int[] parentLocation = new int[2];
	int[] hostViewLocation = new int[2];
	parent.getLocationOnScreen(parentLocation);
	mHostView.getLocationOnScreen(hostViewLocation);
	ViewCompat.offsetLeftAndRight(child, parentLocation[0] - hostViewLocation[0]);
	ViewCompat.offsetTopAndBottom(child, parentLocation[1] - hostViewLocation[1]);
	}
	parent.removeView(child);
	// if (parent.getLayoutTransition() != null) {
	// // LayoutTransition will cause the child to delay removal - cancel it
	// parent.getLayoutTransition().cancel(LayoutTransition.DISAPPEARING);
	// }
	// fail-safe if view is still attached for any reason
	if (child.getParent() != null) {
	parent.removeView(child);
	}
	}
	super.addView(child, getChildCount() - 1);
	}

	public void remove(View view) {
	super.removeView(view);
	if (isEmpty()) {
	mHostView.removeView(this);
	}
	}

	public void clear() {
	removeAllViews();
	if (mDrawables != null) {
	mDrawables.clear();
	}
	}

	boolean isEmpty() {
	return getChildCount() == 0
	&& (mDrawables == null \|\| mDrawables.size() == 0);
	}

	@Override
	public void invalidateDrawable(@NonNull Drawable drawable) {
	invalidate(drawable.getBounds());
	}

	@Override
	protected void dispatchDraw(Canvas canvas) {
	int[] contentViewLocation = new int[2];
	int[] hostViewLocation = new int[2];
	mHostView.getLocationOnScreen(contentViewLocation);
	mRequestingView.getLocationOnScreen(hostViewLocation);
	canvas.translate(hostViewLocation[0] - contentViewLocation[0],
	hostViewLocation[1] - contentViewLocation[1]);
	canvas.clipRect(
	new Rect(0, 0, mRequestingView.getWidth(), mRequestingView.getHeight()));
	super.dispatchDraw(canvas);
	final int numDrawables = (mDrawables == null) ? 0 : mDrawables.size();
	for (int i = 0; i < numDrawables; ++i) {
	mDrawables.get(i).draw(canvas);
	}
	}

	@Override
	protected void onLayout(boolean changed, int l, int t, int r, int b) {
	// Noop: children are positioned absolutely
	}

	/*
	The following invalidation overrides exist for the purpose of redirecting invalidation to
	the host view. The overlay is not parented to the host view (since a View cannot be a
	parent), so the invalidation cannot proceed through the normal parent hierarchy.
	There is a built-in assumption that the overlay exactly covers the host view, therefore
	the invalidation rectangles received do not need to be adjusted when forwarded to
	the host view.
	*/

	private void getOffset(int[] offset) {
	int[] contentViewLocation = new int[2];
	int[] hostViewLocation = new int[2];
	mHostView.getLocationOnScreen(contentViewLocation);
	mRequestingView.getLocationOnScreen(hostViewLocation);
	offset[0] = hostViewLocation[0] - contentViewLocation[0];
	offset[1] = hostViewLocation[1] - contentViewLocation[1];
	}

	public void invalidateChildFast(View child, final Rect dirty) {
	if (mHostView != null) {
	// Note: This is not a "fast" invalidation. Would be nice to instead invalidate
	// using DisplayList properties and a dirty rect instead of causing a real
	// invalidation of the host view
	int left = child.getLeft();
	int top = child.getTop();
	int[] offset = new int[2];
	getOffset(offset);
	// TODO: implement transforms
	// if (!child.getMatrix().isIdentity()) {
	// child.transformRect(dirty);
	// }
	dirty.offset(left + offset[0], top + offset[1]);
	mHostView.invalidate(dirty);
	}
	}

	/**
	* @hide
	*/
	@RestrictTo(LIBRARY_GROUP)
	protected ViewParent invalidateChildInParentFast(int left, int top, Rect dirty) {
	if (mHostView instanceof ViewGroup && sInvalidateChildInParentFastMethod != null) {
	try {
	int[] offset = new int[2];
	getOffset(offset);
	sInvalidateChildInParentFastMethod.invoke(mHostView, left, top, dirty);
	} catch (IllegalAccessException e) {
	e.printStackTrace();
	} catch (InvocationTargetException e) {
	e.printStackTrace();
	}
	}
	return null;
	}

	@SuppressWarnings("deprecation")
	@Override
	public ViewParent invalidateChildInParent(int[] location, Rect dirty) {
	if (mHostView != null) {
	dirty.offset(location[0], location[1]);
	if (mHostView instanceof ViewGroup) {
	location[0] = 0;
	location[1] = 0;
	int[] offset = new int[2];
	getOffset(offset);
	dirty.offset(offset[0], offset[1]);
	return super.invalidateChildInParent(location, dirty);
	// return ((ViewGroup) mHostView).invalidateChildInParent(location, dirty);
	} else {
	invalidate(dirty);
	}
	}
	return null;
	}

	static class TouchInterceptor extends View {
	TouchInterceptor(Context context) {
	super(context);
	}
	}
	}


	}