src/com/android/launcher3/views/BaseDragLayer.java - LeafOS-Project/android_packages_apps_Launcher3 - Gitiles

 /*
  * Copyright (C) 2018 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.views;

 import static android.view.MotionEvent.ACTION_CANCEL;
 import static android.view.MotionEvent.ACTION_DOWN;
 import static android.view.MotionEvent.ACTION_OUTSIDE;
 import static android.view.MotionEvent.ACTION_UP;

 import static com.android.launcher3.util.window.RefreshRateTracker.getSingleFrameMs;

 import android.content.Context;
 import android.graphics.Insets;
 import android.graphics.Rect;
 import android.graphics.RectF;
 import android.util.AttributeSet;
 import android.util.Property;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewDebug;
 import android.view.ViewGroup;
 import android.view.WindowInsets;
 import android.view.accessibility.AccessibilityEvent;
 import android.widget.FrameLayout;

 import com.android.launcher3.AbstractFloatingView;
 import com.android.launcher3.DeviceProfile;
 import com.android.launcher3.InsettableFrameLayout;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.testing.shared.ResourceUtils;
 import com.android.launcher3.util.MultiPropertyFactory.MultiProperty;
 import com.android.launcher3.util.MultiValueAlpha;
 import com.android.launcher3.util.TouchController;

 import java.io.PrintWriter;
 import java.util.ArrayList;

 /**
  * A viewgroup with utility methods for drag-n-drop and touch interception
  */
 public abstract class BaseDragLayer<T extends Context & ActivityContext>
         extends InsettableFrameLayout {

     public static final Property<LayoutParams, Integer> LAYOUT_X =
             new Property<LayoutParams, Integer>(Integer.TYPE, "x") {
                 @Override
                 public Integer get(LayoutParams lp) {
                     return lp.x;
                 }

                 @Override
                 public void set(LayoutParams lp, Integer x) {
                     lp.x = x;
                 }
             };

     public static final Property<LayoutParams, Integer> LAYOUT_Y =
             new Property<LayoutParams, Integer>(Integer.TYPE, "y") {
                 @Override
                 public Integer get(LayoutParams lp) {
                     return lp.y;
                 }

                 @Override
                 public void set(LayoutParams lp, Integer y) {
                     lp.y = y;
                 }
             };

     // Touch coming from normal view system is being dispatched.
     private static final int TOUCH_DISPATCHING_FROM_VIEW = 1 << 0;
     // Touch is being dispatched through the normal view dispatch system, and started at the
     // system gesture region. In this case we prevent internal gesture handling and only allow
     // normal view event handling.
     private static final int TOUCH_DISPATCHING_FROM_VIEW_GESTURE_REGION = 1 << 1;
     // Touch coming from InputMonitor proxy is being dispatched 'only to gestures'. Note that both
     // this and view-system can be active at the same time where view-system would go to the views,
     // and this would go to the gestures.
     // Note that this is not set when events are coming from proxy, but going through full dispatch
     // process (both views and gestures) to allow view-system to easily take over in case it
     // comes later.
     private static final int TOUCH_DISPATCHING_FROM_PROXY = 1 << 2;
     // ACTION_DOWN has been dispatched to child views and ACTION_UP or ACTION_CANCEL is pending.
     // Note that the event source can either be view-dispatching or proxy-dispatching based on if
     // TOUCH_DISPATCHING_VIEW is present or not.
     private static final int TOUCH_DISPATCHING_TO_VIEW_IN_PROGRESS = 1 << 3;

     protected final float[] mTmpXY = new float[2];
     protected final float[] mTmpRectPoints = new float[4];
     protected final Rect mHitRect = new Rect();

     @ViewDebug.ExportedProperty(category = "launcher")
     private final RectF mSystemGestureRegion = new RectF();
     private int mTouchDispatchState = 0;

     protected final T mActivity;
     private final MultiValueAlpha mMultiValueAlpha;

     // All the touch controllers for the view
     protected TouchController[] mControllers;
     // Touch controller which is currently active for the normal view dispatch
     protected TouchController mActiveController;
     // Touch controller which is being used for the proxy events
     protected TouchController mProxyTouchController;

     private TouchCompleteListener mTouchCompleteListener;

     public BaseDragLayer(Context context, AttributeSet attrs, int alphaChannelCount) {
         super(context, attrs);
         mActivity = ActivityContext.lookupContext(context);
         mMultiValueAlpha = new MultiValueAlpha(this, alphaChannelCount);
     }

     /**
      * Called to reinitialize touch controllers.
      */
     public abstract void recreateControllers();

     /**
      * Same as {@link #isEventOverView(View, MotionEvent, View)} where evView == this drag layer.
      */
     public boolean isEventOverView(View view, MotionEvent ev) {
         getDescendantRectRelativeToSelf(view, mHitRect);
         return mHitRect.contains((int) ev.getX(), (int) ev.getY());
     }

     /**
      * Given a motion event in evView's coordinates, return whether the event is within another
      * view's bounds.
      */
     public boolean isEventOverView(View view, MotionEvent ev, View evView) {
         int[] xy = new int[] {(int) ev.getX(), (int) ev.getY()};
         getDescendantCoordRelativeToSelf(evView, xy);
         getDescendantRectRelativeToSelf(view, mHitRect);
         return mHitRect.contains(xy[0], xy[1]);
     }

     @Override
     public boolean onInterceptTouchEvent(MotionEvent ev) {
         int action = ev.getAction();

         if (action == ACTION_UP || action == ACTION_CANCEL) {
             if (mTouchCompleteListener != null) {
                 mTouchCompleteListener.onTouchComplete();
             }
             mTouchCompleteListener = null;
         } else if (action == MotionEvent.ACTION_DOWN) {
             mActivity.finishAutoCancelActionMode();
         }
         return findActiveController(ev);
     }

     private boolean isEventInLauncher(MotionEvent ev) {
         final float x = ev.getX();
         final float y = ev.getY();

         return x >= mSystemGestureRegion.left && x < getWidth() - mSystemGestureRegion.right
                 && y >= mSystemGestureRegion.top && y < getHeight() - mSystemGestureRegion.bottom;
     }

     private TouchController findControllerToHandleTouch(MotionEvent ev) {
         AbstractFloatingView topView = AbstractFloatingView.getTopOpenView(mActivity);
         if (topView != null
                 && (isEventInLauncher(ev) || topView.canInterceptEventsInSystemGestureRegion())
                 && topView.onControllerInterceptTouchEvent(ev)) {
             return topView;
         }

         for (TouchController controller : mControllers) {
             if (controller.onControllerInterceptTouchEvent(ev)) {
                 return controller;
             }
         }
         return null;
     }

     protected boolean findActiveController(MotionEvent ev) {
         mActiveController = null;
         if (canFindActiveController()) {
             mActiveController = findControllerToHandleTouch(ev);
         }
         return mActiveController != null;
     }

     protected boolean canFindActiveController() {
         // Only look for controllers if we are not dispatching from gesture area and proxy is
         // not active
         return (mTouchDispatchState & (TOUCH_DISPATCHING_FROM_VIEW_GESTURE_REGION
                 | TOUCH_DISPATCHING_FROM_PROXY)) == 0;
     }

     @Override
     public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) {
         // Shortcuts can appear above folder
         View topView = AbstractFloatingView.getTopOpenViewWithType(mActivity,
                 AbstractFloatingView.TYPE_ACCESSIBLE);
         if (topView != null) {
             if (child == topView) {
                 return super.onRequestSendAccessibilityEvent(child, event);
             }
             // Skip propagating onRequestSendAccessibilityEvent for all other children
             // which are not topView
             return false;
         }
         return super.onRequestSendAccessibilityEvent(child, event);
     }

     @Override
     public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) {
         View topView = AbstractFloatingView.getTopOpenViewWithType(mActivity,
                 AbstractFloatingView.TYPE_ACCESSIBLE);
         if (topView != null) {
             // Only add the top view as a child for accessibility when it is open
             addAccessibleChildToList(topView, childrenForAccessibility);
         } else {
             super.addChildrenForAccessibility(childrenForAccessibility);
         }
     }

     protected void addAccessibleChildToList(View child, ArrayList<View> outList) {
         if (child.isImportantForAccessibility()) {
             outList.add(child);
         } else {
             child.addChildrenForAccessibility(outList);
         }
     }

     @Override
     public void onViewRemoved(View child) {
         super.onViewRemoved(child);
         if (child instanceof AbstractFloatingView) {
             // Handles the case where the view is removed without being properly closed.
             // This can happen if something goes wrong during a state change/transition.
             AbstractFloatingView floatingView = (AbstractFloatingView) child;
             if (floatingView.isOpen()) {
                 postDelayed(() -> floatingView.close(false), getSingleFrameMs(getContext()));
             }
         }
     }

     @Override
     public boolean onTouchEvent(MotionEvent ev) {
         int action = ev.getAction();
         if (action == ACTION_UP || action == ACTION_CANCEL) {
             if (mTouchCompleteListener != null) {
                 mTouchCompleteListener.onTouchComplete();
             }
             mTouchCompleteListener = null;
         }

         if (mActiveController != null && ev.getAction() != ACTION_OUTSIDE) {
             // For some reason, once we intercept touches and have an mActiveController, we won't
             // get onInterceptTouchEvent() for ACTION_OUTSIDE. Thus, we must recalculate a new
             // TouchController (if any) to handle the ACTION_OUTSIDE here in onTouchEvent() as well.
             return mActiveController.onControllerTouchEvent(ev);
         } else {
             // In case no child view handled the touch event, we may not get onIntercept anymore
             return findActiveController(ev);
         }
     }

     @Override
     public boolean dispatchTouchEvent(MotionEvent ev) {
         switch (ev.getAction()) {
             case ACTION_DOWN: {
                 if ((mTouchDispatchState & TOUCH_DISPATCHING_TO_VIEW_IN_PROGRESS) != 0) {
                     // Cancel the previous touch
                     int action = ev.getAction();
                     ev.setAction(ACTION_CANCEL);
                     super.dispatchTouchEvent(ev);
                     ev.setAction(action);
                 }
                 mTouchDispatchState |= TOUCH_DISPATCHING_FROM_VIEW
                         | TOUCH_DISPATCHING_TO_VIEW_IN_PROGRESS;

                 if (isEventInLauncher(ev)) {
                     mTouchDispatchState &= ~TOUCH_DISPATCHING_FROM_VIEW_GESTURE_REGION;
                 } else {
                     mTouchDispatchState |= TOUCH_DISPATCHING_FROM_VIEW_GESTURE_REGION;
                 }
                 break;
             }
             case ACTION_CANCEL:
             case ACTION_UP:
                 mTouchDispatchState &= ~TOUCH_DISPATCHING_FROM_VIEW_GESTURE_REGION;
                 mTouchDispatchState &= ~TOUCH_DISPATCHING_FROM_VIEW;
                 mTouchDispatchState &= ~TOUCH_DISPATCHING_TO_VIEW_IN_PROGRESS;
                 break;
         }
         super.dispatchTouchEvent(ev);

         // We want to get all events so that mTouchDispatchSource is maintained properly
         return true;
     }

     /**
      * Proxies the touch events to the gesture handlers
      */
     public boolean proxyTouchEvent(MotionEvent ev, boolean allowViewDispatch) {
         int actionMasked = ev.getActionMasked();
         boolean isViewDispatching = (mTouchDispatchState & TOUCH_DISPATCHING_FROM_VIEW) != 0;

         // Only do view dispatch if another view-dispatching is not running, or we already started
         // proxy-dispatching before. Note that view-dispatching can always take over the proxy
         // dispatching at anytime, but not vice-versa.
         allowViewDispatch = allowViewDispatch && !isViewDispatching
                 && (actionMasked == ACTION_DOWN
                     || ((mTouchDispatchState & TOUCH_DISPATCHING_TO_VIEW_IN_PROGRESS) != 0));

         if (allowViewDispatch) {
             mTouchDispatchState |= TOUCH_DISPATCHING_TO_VIEW_IN_PROGRESS;
             super.dispatchTouchEvent(ev);

             if (actionMasked == ACTION_UP || actionMasked == ACTION_CANCEL) {
                 mTouchDispatchState &= ~TOUCH_DISPATCHING_TO_VIEW_IN_PROGRESS;
                 mTouchDispatchState &= ~TOUCH_DISPATCHING_FROM_PROXY;
             }
             return true;
         } else {
             boolean handled;
             if (mProxyTouchController != null) {
                 handled = mProxyTouchController.onControllerTouchEvent(ev);
             } else {
                 if (actionMasked == ACTION_DOWN) {
                     if (isViewDispatching && mActiveController != null) {
                         // A controller is already active, we can't initiate our own controller
                         mTouchDispatchState &= ~TOUCH_DISPATCHING_FROM_PROXY;
                     } else {
                         // We will control the handler via proxy
                         mTouchDispatchState |= TOUCH_DISPATCHING_FROM_PROXY;
                     }
                 }
                 if ((mTouchDispatchState & TOUCH_DISPATCHING_FROM_PROXY) != 0) {
                     mProxyTouchController = findControllerToHandleTouch(ev);
                 }
                 handled = mProxyTouchController != null;
             }
             if (actionMasked == ACTION_UP || actionMasked == ACTION_CANCEL) {
                 mProxyTouchController = null;
                 mTouchDispatchState &= ~TOUCH_DISPATCHING_FROM_PROXY;
             }
             return handled;
         }
     }

     /**
      * Determine the rect of the descendant in this DragLayer's coordinates
      *
      * @param descendant The descendant whose coordinates we want to find.
      * @param r The rect into which to place the results.
      * @return The factor by which this descendant is scaled relative to this DragLayer.
      */
     public float getDescendantRectRelativeToSelf(View descendant, Rect r) {
         mTmpRectPoints[0] = 0;
         mTmpRectPoints[1] = 0;
         mTmpRectPoints[2] = descendant.getWidth();
         mTmpRectPoints[3] = descendant.getHeight();
         float s = getDescendantCoordRelativeToSelf(descendant, mTmpRectPoints);
         r.left = Math.round(Math.min(mTmpRectPoints[0], mTmpRectPoints[2]));
         r.top = Math.round(Math.min(mTmpRectPoints[1], mTmpRectPoints[3]));
         r.right = Math.round(Math.max(mTmpRectPoints[0], mTmpRectPoints[2]));
         r.bottom = Math.round(Math.max(mTmpRectPoints[1], mTmpRectPoints[3]));
         return s;
     }

     public float getLocationInDragLayer(View child, int[] loc) {
         loc[0] = 0;
         loc[1] = 0;
         return getDescendantCoordRelativeToSelf(child, loc);
     }

     public float getDescendantCoordRelativeToSelf(View descendant, int[] coord) {
         mTmpXY[0] = coord[0];
         mTmpXY[1] = coord[1];
         float scale = getDescendantCoordRelativeToSelf(descendant, mTmpXY);
         Utilities.roundArray(mTmpXY, coord);
         return scale;
     }

     public float getDescendantCoordRelativeToSelf(View descendant, float[] coord) {
         return getDescendantCoordRelativeToSelf(descendant, coord, false);
     }

     /**
      * Given a coordinate relative to the descendant, find the coordinate in this DragLayer's
      * coordinates.
      *
      * @param descendant The descendant to which the passed coordinate is relative.
      * @param coord The coordinate that we want mapped.
      * @param includeRootScroll Whether or not to account for the scroll of the root descendant:
      *          sometimes this is relevant as in a child's coordinates within the root descendant.
      * @return The factor by which this descendant is scaled relative to this DragLayer. Caution
      *         this scale factor is assumed to be equal in X and Y, and so if at any point this
      *         assumption fails, we will need to return a pair of scale factors.
      */
     public float getDescendantCoordRelativeToSelf(View descendant, float[] coord,
             boolean includeRootScroll) {
         return Utilities.getDescendantCoordRelativeToAncestor(descendant, this,
                 coord, includeRootScroll);
     }

     /**
      * Similar to {@link #mapCoordInSelfToDescendant(View descendant, float[] coord)}
      * but accepts a Rect instead of float[].
      */
     public void mapRectInSelfToDescendant(View descendant, Rect rect) {
         Utilities.mapRectInSelfToDescendant(descendant, this, rect);
     }

     /**
      * Inverse of {@link #getDescendantCoordRelativeToSelf(View, float[])}.
      */
     public void mapCoordInSelfToDescendant(View descendant, float[] coord) {
         Utilities.mapCoordInSelfToDescendant(descendant, this, coord);
     }

     /**
      * Inverse of {@link #getDescendantCoordRelativeToSelf(View, int[])}.
      */
     public void mapCoordInSelfToDescendant(View descendant, int[] coord) {
         mTmpXY[0] = coord[0];
         mTmpXY[1] = coord[1];
         Utilities.mapCoordInSelfToDescendant(descendant, this, mTmpXY);
         Utilities.roundArray(mTmpXY, coord);
     }

     public void getViewRectRelativeToSelf(View v, Rect r) {
         int[] loc = getViewLocationRelativeToSelf(v);
         r.set(loc[0], loc[1], loc[0] + v.getMeasuredWidth(), loc[1] + v.getMeasuredHeight());
     }

     protected int[] getViewLocationRelativeToSelf(View v) {
         int[] loc = new int[2];
         getLocationInWindow(loc);
         int x = loc[0];
         int y = loc[1];

         v.getLocationInWindow(loc);
         loc[0] -= x;
         loc[1] -= y;
         return loc;
     }

     @Override
     protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
         View topView = AbstractFloatingView.getTopOpenView(mActivity);
         if (topView != null) {
             return topView.requestFocus(direction, previouslyFocusedRect);
         } else {
             return super.onRequestFocusInDescendants(direction, previouslyFocusedRect);
         }
     }

     @Override
     public void addFocusables(ArrayList<View> views, int direction, int focusableMode) {
         View topView = AbstractFloatingView.getTopOpenView(mActivity);
         if (topView != null) {
             topView.addFocusables(views, direction);
         } else {
             super.addFocusables(views, direction, focusableMode);
         }
     }

     public void setTouchCompleteListener(TouchCompleteListener listener) {
         mTouchCompleteListener = listener;
     }

     public interface TouchCompleteListener {
         void onTouchComplete();
     }

     @Override
     public LayoutParams generateLayoutParams(AttributeSet attrs) {
         return new LayoutParams(getContext(), attrs);
     }

     @Override
     protected LayoutParams generateDefaultLayoutParams() {
         return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
     }

     // Override to allow type-checking of LayoutParams.
     @Override
     protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
         return p instanceof LayoutParams;
     }

     @Override
     protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
         return new LayoutParams(p);
     }

     public MultiProperty getAlphaProperty(int index) {
         return mMultiValueAlpha.get(index);
     }

     public void dump(String prefix, PrintWriter writer) {
         writer.println(prefix + "DragLayer:");
         if (mActiveController != null) {
             writer.println(prefix + "\tactiveController: " + mActiveController);
             mActiveController.dump(prefix + "\t", writer);
         }
         writer.println(prefix + "\tdragLayerAlpha : " + mMultiValueAlpha );
     }

     public static class LayoutParams extends InsettableFrameLayout.LayoutParams {
         public int x, y;
         public boolean customPosition = false;

         public LayoutParams(Context c, AttributeSet attrs) {
             super(c, attrs);
         }

         public LayoutParams(int width, int height) {
             super(width, height);
         }

         public LayoutParams(ViewGroup.LayoutParams lp) {
             super(lp);
         }
     }

     protected void onLayout(boolean changed, int l, int t, int r, int b) {
         super.onLayout(changed, l, t, r, b);
         int count = getChildCount();
         for (int i = 0; i < count; i++) {
             View child = getChildAt(i);
             final FrameLayout.LayoutParams flp = (FrameLayout.LayoutParams) child.getLayoutParams();
             if (flp instanceof LayoutParams) {
                 final LayoutParams lp = (LayoutParams) flp;
                 if (lp.customPosition) {
                     child.layout(lp.x, lp.y, lp.x + lp.width, lp.y + lp.height);
                 }
             }
         }
     }

     @Override
     public WindowInsets dispatchApplyWindowInsets(WindowInsets insets) {
         Insets gestureInsets = insets.getMandatorySystemGestureInsets();
         int gestureInsetBottom = gestureInsets.bottom;
         Insets imeInset = insets.getInsets(WindowInsets.Type.ime());
         DeviceProfile dp = mActivity.getDeviceProfile();
         if (dp.isTaskbarPresent) {
             // Ignore taskbar gesture insets to avoid interfering with TouchControllers.
             gestureInsetBottom = ResourceUtils.getNavbarSize(
                     ResourceUtils.NAVBAR_BOTTOM_GESTURE_SIZE, getResources());
         }
         mSystemGestureRegion.set(
                 Math.max(gestureInsets.left, imeInset.left),
                 Math.max(gestureInsets.top, imeInset.top),
                 Math.max(gestureInsets.right, imeInset.right),
                 Math.max(gestureInsetBottom, imeInset.bottom)
         );
         return super.dispatchApplyWindowInsets(insets);
     }
 }
	/*
	* Copyright (C) 2018 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.views;

	import static android.view.MotionEvent.ACTION_CANCEL;
	import static android.view.MotionEvent.ACTION_DOWN;
	import static android.view.MotionEvent.ACTION_OUTSIDE;
	import static android.view.MotionEvent.ACTION_UP;

	import static com.android.launcher3.util.window.RefreshRateTracker.getSingleFrameMs;

	import android.content.Context;
	import android.graphics.Insets;
	import android.graphics.Rect;
	import android.graphics.RectF;
	import android.util.AttributeSet;
	import android.util.Property;
	import android.view.MotionEvent;
	import android.view.View;
	import android.view.ViewDebug;
	import android.view.ViewGroup;
	import android.view.WindowInsets;
	import android.view.accessibility.AccessibilityEvent;
	import android.widget.FrameLayout;

	import com.android.launcher3.AbstractFloatingView;
	import com.android.launcher3.DeviceProfile;
	import com.android.launcher3.InsettableFrameLayout;
	import com.android.launcher3.Utilities;
	import com.android.launcher3.testing.shared.ResourceUtils;
	import com.android.launcher3.util.MultiPropertyFactory.MultiProperty;
	import com.android.launcher3.util.MultiValueAlpha;
	import com.android.launcher3.util.TouchController;

	import java.io.PrintWriter;
	import java.util.ArrayList;

	/**
	* A viewgroup with utility methods for drag-n-drop and touch interception
	*/
	public abstract class BaseDragLayer<T extends Context & ActivityContext>
	extends InsettableFrameLayout {

	public static final Property<LayoutParams, Integer> LAYOUT_X =
	new Property<LayoutParams, Integer>(Integer.TYPE, "x") {
	@Override
	public Integer get(LayoutParams lp) {
	return lp.x;
	}

	@Override
	public void set(LayoutParams lp, Integer x) {
	lp.x = x;
	}
	};

	public static final Property<LayoutParams, Integer> LAYOUT_Y =
	new Property<LayoutParams, Integer>(Integer.TYPE, "y") {
	@Override
	public Integer get(LayoutParams lp) {
	return lp.y;
	}

	@Override
	public void set(LayoutParams lp, Integer y) {
	lp.y = y;
	}
	};

	// Touch coming from normal view system is being dispatched.
	private static final int TOUCH_DISPATCHING_FROM_VIEW = 1 << 0;
	// Touch is being dispatched through the normal view dispatch system, and started at the
	// system gesture region. In this case we prevent internal gesture handling and only allow
	// normal view event handling.
	private static final int TOUCH_DISPATCHING_FROM_VIEW_GESTURE_REGION = 1 << 1;
	// Touch coming from InputMonitor proxy is being dispatched 'only to gestures'. Note that both
	// this and view-system can be active at the same time where view-system would go to the views,
	// and this would go to the gestures.
	// Note that this is not set when events are coming from proxy, but going through full dispatch
	// process (both views and gestures) to allow view-system to easily take over in case it
	// comes later.
	private static final int TOUCH_DISPATCHING_FROM_PROXY = 1 << 2;
	// ACTION_DOWN has been dispatched to child views and ACTION_UP or ACTION_CANCEL is pending.
	// Note that the event source can either be view-dispatching or proxy-dispatching based on if
	// TOUCH_DISPATCHING_VIEW is present or not.
	private static final int TOUCH_DISPATCHING_TO_VIEW_IN_PROGRESS = 1 << 3;

	protected final float[] mTmpXY = new float[2];
	protected final float[] mTmpRectPoints = new float[4];
	protected final Rect mHitRect = new Rect();

	@ViewDebug.ExportedProperty(category = "launcher")
	private final RectF mSystemGestureRegion = new RectF();
	private int mTouchDispatchState = 0;

	protected final T mActivity;
	private final MultiValueAlpha mMultiValueAlpha;

	// All the touch controllers for the view
	protected TouchController[] mControllers;
	// Touch controller which is currently active for the normal view dispatch
	protected TouchController mActiveController;
	// Touch controller which is being used for the proxy events
	protected TouchController mProxyTouchController;

	private TouchCompleteListener mTouchCompleteListener;

	public BaseDragLayer(Context context, AttributeSet attrs, int alphaChannelCount) {
	super(context, attrs);
	mActivity = ActivityContext.lookupContext(context);
	mMultiValueAlpha = new MultiValueAlpha(this, alphaChannelCount);
	}

	/**
	* Called to reinitialize touch controllers.
	*/
	public abstract void recreateControllers();

	/**
	* Same as {@link #isEventOverView(View, MotionEvent, View)} where evView == this drag layer.
	*/
	public boolean isEventOverView(View view, MotionEvent ev) {
	getDescendantRectRelativeToSelf(view, mHitRect);
	return mHitRect.contains((int) ev.getX(), (int) ev.getY());
	}

	/**
	* Given a motion event in evView's coordinates, return whether the event is within another
	* view's bounds.
	*/
	public boolean isEventOverView(View view, MotionEvent ev, View evView) {
	int[] xy = new int[] {(int) ev.getX(), (int) ev.getY()};
	getDescendantCoordRelativeToSelf(evView, xy);
	getDescendantRectRelativeToSelf(view, mHitRect);
	return mHitRect.contains(xy[0], xy[1]);
	}

	@Override
	public boolean onInterceptTouchEvent(MotionEvent ev) {
	int action = ev.getAction();

	if (action == ACTION_UP \|\| action == ACTION_CANCEL) {
	if (mTouchCompleteListener != null) {
	mTouchCompleteListener.onTouchComplete();
	}
	mTouchCompleteListener = null;
	} else if (action == MotionEvent.ACTION_DOWN) {
	mActivity.finishAutoCancelActionMode();
	}
	return findActiveController(ev);
	}

	private boolean isEventInLauncher(MotionEvent ev) {
	final float x = ev.getX();
	final float y = ev.getY();

	return x >= mSystemGestureRegion.left && x < getWidth() - mSystemGestureRegion.right
	&& y >= mSystemGestureRegion.top && y < getHeight() - mSystemGestureRegion.bottom;
	}

	private TouchController findControllerToHandleTouch(MotionEvent ev) {
	AbstractFloatingView topView = AbstractFloatingView.getTopOpenView(mActivity);
	if (topView != null
	&& (isEventInLauncher(ev) \|\| topView.canInterceptEventsInSystemGestureRegion())
	&& topView.onControllerInterceptTouchEvent(ev)) {
	return topView;
	}

	for (TouchController controller : mControllers) {
	if (controller.onControllerInterceptTouchEvent(ev)) {
	return controller;
	}
	}
	return null;
	}

	protected boolean findActiveController(MotionEvent ev) {
	mActiveController = null;
	if (canFindActiveController()) {
	mActiveController = findControllerToHandleTouch(ev);
	}
	return mActiveController != null;
	}

	protected boolean canFindActiveController() {
	// Only look for controllers if we are not dispatching from gesture area and proxy is
	// not active
	return (mTouchDispatchState & (TOUCH_DISPATCHING_FROM_VIEW_GESTURE_REGION
	\| TOUCH_DISPATCHING_FROM_PROXY)) == 0;
	}

	@Override
	public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) {
	// Shortcuts can appear above folder
	View topView = AbstractFloatingView.getTopOpenViewWithType(mActivity,
	AbstractFloatingView.TYPE_ACCESSIBLE);
	if (topView != null) {
	if (child == topView) {
	return super.onRequestSendAccessibilityEvent(child, event);
	}
	// Skip propagating onRequestSendAccessibilityEvent for all other children
	// which are not topView
	return false;
	}
	return super.onRequestSendAccessibilityEvent(child, event);
	}

	@Override
	public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) {
	View topView = AbstractFloatingView.getTopOpenViewWithType(mActivity,
	AbstractFloatingView.TYPE_ACCESSIBLE);
	if (topView != null) {
	// Only add the top view as a child for accessibility when it is open
	addAccessibleChildToList(topView, childrenForAccessibility);
	} else {
	super.addChildrenForAccessibility(childrenForAccessibility);
	}
	}

	protected void addAccessibleChildToList(View child, ArrayList<View> outList) {
	if (child.isImportantForAccessibility()) {
	outList.add(child);
	} else {
	child.addChildrenForAccessibility(outList);
	}
	}

	@Override
	public void onViewRemoved(View child) {
	super.onViewRemoved(child);
	if (child instanceof AbstractFloatingView) {
	// Handles the case where the view is removed without being properly closed.
	// This can happen if something goes wrong during a state change/transition.
	AbstractFloatingView floatingView = (AbstractFloatingView) child;
	if (floatingView.isOpen()) {
	postDelayed(() -> floatingView.close(false), getSingleFrameMs(getContext()));
	}
	}
	}

	@Override
	public boolean onTouchEvent(MotionEvent ev) {
	int action = ev.getAction();
	if (action == ACTION_UP \|\| action == ACTION_CANCEL) {
	if (mTouchCompleteListener != null) {
	mTouchCompleteListener.onTouchComplete();
	}
	mTouchCompleteListener = null;
	}

	if (mActiveController != null && ev.getAction() != ACTION_OUTSIDE) {
	// For some reason, once we intercept touches and have an mActiveController, we won't
	// get onInterceptTouchEvent() for ACTION_OUTSIDE. Thus, we must recalculate a new
	// TouchController (if any) to handle the ACTION_OUTSIDE here in onTouchEvent() as well.
	return mActiveController.onControllerTouchEvent(ev);
	} else {
	// In case no child view handled the touch event, we may not get onIntercept anymore
	return findActiveController(ev);
	}
	}

	@Override
	public boolean dispatchTouchEvent(MotionEvent ev) {
	switch (ev.getAction()) {
	case ACTION_DOWN: {
	if ((mTouchDispatchState & TOUCH_DISPATCHING_TO_VIEW_IN_PROGRESS) != 0) {
	// Cancel the previous touch
	int action = ev.getAction();
	ev.setAction(ACTION_CANCEL);
	super.dispatchTouchEvent(ev);
	ev.setAction(action);
	}
	mTouchDispatchState \|= TOUCH_DISPATCHING_FROM_VIEW
	\| TOUCH_DISPATCHING_TO_VIEW_IN_PROGRESS;

	if (isEventInLauncher(ev)) {
	mTouchDispatchState &= ~TOUCH_DISPATCHING_FROM_VIEW_GESTURE_REGION;
	} else {
	mTouchDispatchState \|= TOUCH_DISPATCHING_FROM_VIEW_GESTURE_REGION;
	}
	break;
	}
	case ACTION_CANCEL:
	case ACTION_UP:
	mTouchDispatchState &= ~TOUCH_DISPATCHING_FROM_VIEW_GESTURE_REGION;
	mTouchDispatchState &= ~TOUCH_DISPATCHING_FROM_VIEW;
	mTouchDispatchState &= ~TOUCH_DISPATCHING_TO_VIEW_IN_PROGRESS;
	break;
	}
	super.dispatchTouchEvent(ev);

	// We want to get all events so that mTouchDispatchSource is maintained properly
	return true;
	}

	/**
	* Proxies the touch events to the gesture handlers
	*/
	public boolean proxyTouchEvent(MotionEvent ev, boolean allowViewDispatch) {
	int actionMasked = ev.getActionMasked();
	boolean isViewDispatching = (mTouchDispatchState & TOUCH_DISPATCHING_FROM_VIEW) != 0;

	// Only do view dispatch if another view-dispatching is not running, or we already started
	// proxy-dispatching before. Note that view-dispatching can always take over the proxy
	// dispatching at anytime, but not vice-versa.
	allowViewDispatch = allowViewDispatch && !isViewDispatching
	&& (actionMasked == ACTION_DOWN
	\|\| ((mTouchDispatchState & TOUCH_DISPATCHING_TO_VIEW_IN_PROGRESS) != 0));

	if (allowViewDispatch) {
	mTouchDispatchState \|= TOUCH_DISPATCHING_TO_VIEW_IN_PROGRESS;
	super.dispatchTouchEvent(ev);

	if (actionMasked == ACTION_UP \|\| actionMasked == ACTION_CANCEL) {
	mTouchDispatchState &= ~TOUCH_DISPATCHING_TO_VIEW_IN_PROGRESS;
	mTouchDispatchState &= ~TOUCH_DISPATCHING_FROM_PROXY;
	}
	return true;
	} else {
	boolean handled;
	if (mProxyTouchController != null) {
	handled = mProxyTouchController.onControllerTouchEvent(ev);
	} else {
	if (actionMasked == ACTION_DOWN) {
	if (isViewDispatching && mActiveController != null) {
	// A controller is already active, we can't initiate our own controller
	mTouchDispatchState &= ~TOUCH_DISPATCHING_FROM_PROXY;
	} else {
	// We will control the handler via proxy
	mTouchDispatchState \|= TOUCH_DISPATCHING_FROM_PROXY;
	}
	}
	if ((mTouchDispatchState & TOUCH_DISPATCHING_FROM_PROXY) != 0) {
	mProxyTouchController = findControllerToHandleTouch(ev);
	}
	handled = mProxyTouchController != null;
	}
	if (actionMasked == ACTION_UP \|\| actionMasked == ACTION_CANCEL) {
	mProxyTouchController = null;
	mTouchDispatchState &= ~TOUCH_DISPATCHING_FROM_PROXY;
	}
	return handled;
	}
	}

	/**
	* Determine the rect of the descendant in this DragLayer's coordinates
	*
	* @param descendant The descendant whose coordinates we want to find.
	* @param r The rect into which to place the results.
	* @return The factor by which this descendant is scaled relative to this DragLayer.
	*/
	public float getDescendantRectRelativeToSelf(View descendant, Rect r) {
	mTmpRectPoints[0] = 0;
	mTmpRectPoints[1] = 0;
	mTmpRectPoints[2] = descendant.getWidth();
	mTmpRectPoints[3] = descendant.getHeight();
	float s = getDescendantCoordRelativeToSelf(descendant, mTmpRectPoints);
	r.left = Math.round(Math.min(mTmpRectPoints[0], mTmpRectPoints[2]));
	r.top = Math.round(Math.min(mTmpRectPoints[1], mTmpRectPoints[3]));
	r.right = Math.round(Math.max(mTmpRectPoints[0], mTmpRectPoints[2]));
	r.bottom = Math.round(Math.max(mTmpRectPoints[1], mTmpRectPoints[3]));
	return s;
	}

	public float getLocationInDragLayer(View child, int[] loc) {
	loc[0] = 0;
	loc[1] = 0;
	return getDescendantCoordRelativeToSelf(child, loc);
	}

	public float getDescendantCoordRelativeToSelf(View descendant, int[] coord) {
	mTmpXY[0] = coord[0];
	mTmpXY[1] = coord[1];
	float scale = getDescendantCoordRelativeToSelf(descendant, mTmpXY);
	Utilities.roundArray(mTmpXY, coord);
	return scale;
	}

	public float getDescendantCoordRelativeToSelf(View descendant, float[] coord) {
	return getDescendantCoordRelativeToSelf(descendant, coord, false);
	}

	/**
	* Given a coordinate relative to the descendant, find the coordinate in this DragLayer's
	* coordinates.
	*
	* @param descendant The descendant to which the passed coordinate is relative.
	* @param coord The coordinate that we want mapped.
	* @param includeRootScroll Whether or not to account for the scroll of the root descendant:
	* sometimes this is relevant as in a child's coordinates within the root descendant.
	* @return The factor by which this descendant is scaled relative to this DragLayer. Caution
	* this scale factor is assumed to be equal in X and Y, and so if at any point this
	* assumption fails, we will need to return a pair of scale factors.
	*/
	public float getDescendantCoordRelativeToSelf(View descendant, float[] coord,
	boolean includeRootScroll) {
	return Utilities.getDescendantCoordRelativeToAncestor(descendant, this,
	coord, includeRootScroll);
	}

	/**
	* Similar to {@link #mapCoordInSelfToDescendant(View descendant, float[] coord)}
	* but accepts a Rect instead of float[].
	*/
	public void mapRectInSelfToDescendant(View descendant, Rect rect) {
	Utilities.mapRectInSelfToDescendant(descendant, this, rect);
	}

	/**
	* Inverse of {@link #getDescendantCoordRelativeToSelf(View, float[])}.
	*/
	public void mapCoordInSelfToDescendant(View descendant, float[] coord) {
	Utilities.mapCoordInSelfToDescendant(descendant, this, coord);
	}

	/**
	* Inverse of {@link #getDescendantCoordRelativeToSelf(View, int[])}.
	*/
	public void mapCoordInSelfToDescendant(View descendant, int[] coord) {
	mTmpXY[0] = coord[0];
	mTmpXY[1] = coord[1];
	Utilities.mapCoordInSelfToDescendant(descendant, this, mTmpXY);
	Utilities.roundArray(mTmpXY, coord);
	}

	public void getViewRectRelativeToSelf(View v, Rect r) {
	int[] loc = getViewLocationRelativeToSelf(v);
	r.set(loc[0], loc[1], loc[0] + v.getMeasuredWidth(), loc[1] + v.getMeasuredHeight());
	}

	protected int[] getViewLocationRelativeToSelf(View v) {
	int[] loc = new int[2];
	getLocationInWindow(loc);
	int x = loc[0];
	int y = loc[1];

	v.getLocationInWindow(loc);
	loc[0] -= x;
	loc[1] -= y;
	return loc;
	}

	@Override
	protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
	View topView = AbstractFloatingView.getTopOpenView(mActivity);
	if (topView != null) {
	return topView.requestFocus(direction, previouslyFocusedRect);
	} else {
	return super.onRequestFocusInDescendants(direction, previouslyFocusedRect);
	}
	}

	@Override
	public void addFocusables(ArrayList<View> views, int direction, int focusableMode) {
	View topView = AbstractFloatingView.getTopOpenView(mActivity);
	if (topView != null) {
	topView.addFocusables(views, direction);
	} else {
	super.addFocusables(views, direction, focusableMode);
	}
	}

	public void setTouchCompleteListener(TouchCompleteListener listener) {
	mTouchCompleteListener = listener;
	}

	public interface TouchCompleteListener {
	void onTouchComplete();
	}

	@Override
	public LayoutParams generateLayoutParams(AttributeSet attrs) {
	return new LayoutParams(getContext(), attrs);
	}

	@Override
	protected LayoutParams generateDefaultLayoutParams() {
	return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
	}

	// Override to allow type-checking of LayoutParams.
	@Override
	protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
	return p instanceof LayoutParams;
	}

	@Override
	protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
	return new LayoutParams(p);
	}

	public MultiProperty getAlphaProperty(int index) {
	return mMultiValueAlpha.get(index);
	}

	public void dump(String prefix, PrintWriter writer) {
	writer.println(prefix + "DragLayer:");
	if (mActiveController != null) {
	writer.println(prefix + "\tactiveController: " + mActiveController);
	mActiveController.dump(prefix + "\t", writer);
	}
	writer.println(prefix + "\tdragLayerAlpha : " + mMultiValueAlpha );
	}

	public static class LayoutParams extends InsettableFrameLayout.LayoutParams {
	public int x, y;
	public boolean customPosition = false;

	public LayoutParams(Context c, AttributeSet attrs) {
	super(c, attrs);
	}

	public LayoutParams(int width, int height) {
	super(width, height);
	}

	public LayoutParams(ViewGroup.LayoutParams lp) {
	super(lp);
	}
	}

	protected void onLayout(boolean changed, int l, int t, int r, int b) {
	super.onLayout(changed, l, t, r, b);
	int count = getChildCount();
	for (int i = 0; i < count; i++) {
	View child = getChildAt(i);
	final FrameLayout.LayoutParams flp = (FrameLayout.LayoutParams) child.getLayoutParams();
	if (flp instanceof LayoutParams) {
	final LayoutParams lp = (LayoutParams) flp;
	if (lp.customPosition) {
	child.layout(lp.x, lp.y, lp.x + lp.width, lp.y + lp.height);
	}
	}
	}
	}

	@Override
	public WindowInsets dispatchApplyWindowInsets(WindowInsets insets) {
	Insets gestureInsets = insets.getMandatorySystemGestureInsets();
	int gestureInsetBottom = gestureInsets.bottom;
	Insets imeInset = insets.getInsets(WindowInsets.Type.ime());
	DeviceProfile dp = mActivity.getDeviceProfile();
	if (dp.isTaskbarPresent) {
	// Ignore taskbar gesture insets to avoid interfering with TouchControllers.
	gestureInsetBottom = ResourceUtils.getNavbarSize(
	ResourceUtils.NAVBAR_BOTTOM_GESTURE_SIZE, getResources());
	}
	mSystemGestureRegion.set(
	Math.max(gestureInsets.left, imeInset.left),
	Math.max(gestureInsets.top, imeInset.top),
	Math.max(gestureInsets.right, imeInset.right),
	Math.max(gestureInsetBottom, imeInset.bottom)
	);
	return super.dispatchApplyWindowInsets(insets);
	}
	}