src/com/android/launcher3/keyboard/KeyboardDragAndDropView.java - platform/packages/apps/Launcher3 - Git at Google

 /*
  * Copyright (C) 2021 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.keyboard;

 import static android.app.Activity.DEFAULT_KEYS_SEARCH_LOCAL;

 import static com.android.launcher3.LauncherState.SPRING_LOADED;

 import android.app.Activity;
 import android.content.Context;
 import android.graphics.Canvas;
 import android.graphics.Paint.Style;
 import android.graphics.Rect;
 import android.graphics.RectF;
 import android.util.AttributeSet;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewParent;
 import android.widget.TextView;

 import androidx.core.view.accessibility.AccessibilityNodeInfoCompat;

 import com.android.launcher3.AbstractFloatingView;
 import com.android.launcher3.CellLayout;
 import com.android.launcher3.Insettable;
 import com.android.launcher3.Launcher;
 import com.android.launcher3.LauncherState;
 import com.android.launcher3.PagedView;
 import com.android.launcher3.R;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.accessibility.DragAndDropAccessibilityDelegate;
 import com.android.launcher3.dragndrop.DragOptions;
 import com.android.launcher3.folder.Folder;
 import com.android.launcher3.model.data.ItemInfo;
 import com.android.launcher3.statemanager.StateManager.StateListener;
 import com.android.launcher3.touch.ItemLongClickListener;
 import com.android.launcher3.util.Themes;

 import java.util.ArrayList;
 import java.util.Objects;
 import java.util.function.ToIntBiFunction;
 import java.util.function.ToIntFunction;

 /**
  * A floating view to allow keyboard navigation across virtual nodes
  */
 public class KeyboardDragAndDropView extends AbstractFloatingView
         implements Insettable, StateListener<LauncherState> {

     private static final long MINOR_AXIS_WEIGHT = 13;

     private final ArrayList<Integer> mIntList = new ArrayList<>();
     private final ArrayList<DragAndDropAccessibilityDelegate> mDelegates = new ArrayList<>();
     private final ArrayList<VirtualNodeInfo> mNodes = new ArrayList<>();

     private final Rect mTempRect = new Rect();
     private final Rect mTempRect2 = new Rect();
     private final AccessibilityNodeInfoCompat mTempNodeInfo = AccessibilityNodeInfoCompat.obtain();

     private final RectFocusIndicator mFocusIndicator;

     private final Launcher mLauncher;
     private VirtualNodeInfo mCurrentSelection;


     public KeyboardDragAndDropView(Context context, AttributeSet attrs) {
         this(context, attrs, 0);
     }

     public KeyboardDragAndDropView(Context context, AttributeSet attrs, int defStyleAttr) {
         super(context, attrs, defStyleAttr);
         mLauncher = Launcher.getLauncher(context);
         mFocusIndicator = new RectFocusIndicator(this);
         setWillNotDraw(false);
     }

     @Override
     protected void handleClose(boolean animate) {
         mLauncher.getDragLayer().removeView(this);
         mLauncher.getStateManager().removeStateListener(this);
         mLauncher.setDefaultKeyMode(DEFAULT_KEYS_SEARCH_LOCAL);
         mIsOpen = false;
     }

     @Override
     protected boolean isOfType(int type) {
         return (type & TYPE_DRAG_DROP_POPUP) != 0;
     }

     @Override
     public boolean onControllerInterceptTouchEvent(MotionEvent ev) {
         // Consume all touch
         return true;
     }

     @Override
     public void setInsets(Rect insets) {
         setPadding(insets.left, insets.top, insets.right, insets.bottom);
     }

     @Override
     public void onStateTransitionStart(LauncherState toState) {
         if (toState != SPRING_LOADED) {
             close(false);
         }
     }

     @Override
     public void onStateTransitionComplete(LauncherState finalState) {
         if (mCurrentSelection != null) {
             setCurrentSelection(mCurrentSelection);
         }
     }

     private void setCurrentSelection(VirtualNodeInfo nodeInfo) {
         mCurrentSelection = nodeInfo;
         ((TextView) findViewById(R.id.label))
                 .setText(nodeInfo.populate(mTempNodeInfo).getContentDescription());

         Rect bounds = new Rect();
         mTempNodeInfo.getBoundsInParent(bounds);
         View host = nodeInfo.delegate.getHost();
         ViewParent parent = host.getParent();
         if (parent instanceof PagedView) {
             PagedView pv = (PagedView) parent;
             int pageIndex = pv.indexOfChild(host);

             pv.setCurrentPage(pageIndex);
             bounds.offset(pv.getScrollX() - pv.getScrollForPage(pageIndex), 0);
         }
         float[] pos = new float[] {bounds.left, bounds.top, bounds.right, bounds.bottom};
         Utilities.getDescendantCoordRelativeToAncestor(host, mLauncher.getDragLayer(), pos, true);

         new RectF(pos[0], pos[1], pos[2], pos[3]).roundOut(bounds);
         mFocusIndicator.changeFocus(bounds, true);
     }

     @Override
     protected void onDraw(Canvas canvas) {
         mFocusIndicator.draw(canvas);
     }

     @Override
     public boolean dispatchUnhandledMove(View focused, int direction) {
         VirtualNodeInfo nodeInfo = getNextSelection(direction);
         if (nodeInfo == null) {
             return false;
         }
         setCurrentSelection(nodeInfo);
         return true;
     }

     /**
      * Focus finding logic:
      * Collect all virtual nodes in reading order (used for forward and backwards).
      * Then find the closest view by comparing the distances spatially. Since it is a move
      * operation. consider all cell sizes to be approximately of the same size.
      */
     private VirtualNodeInfo getNextSelection(int direction) {
         // Collect all virtual nodes
         mDelegates.clear();
         mNodes.clear();

         Folder openFolder = Folder.getOpen(mLauncher);
         PagedView pv = openFolder == null ? mLauncher.getWorkspace() : openFolder.getContent();
         int count = pv.getPageCount();
         for (int i = 0; i < count; i++) {
             mDelegates.add(((CellLayout) pv.getChildAt(i)).getDragAndDropAccessibilityDelegate());
         }
         if (openFolder == null) {
             mDelegates.add(pv.getNextPage() + 1,
                     mLauncher.getHotseat().getDragAndDropAccessibilityDelegate());
         }
         mDelegates.forEach(delegate -> {
             mIntList.clear();
             delegate.getVisibleVirtualViews(mIntList);
             mIntList.forEach(id -> mNodes.add(new VirtualNodeInfo(delegate, id)));
         });

         if (mNodes.isEmpty()) {
             return null;
         }
         int index = mNodes.indexOf(mCurrentSelection);
         if (mCurrentSelection == null || index < 0) {
             return null;
         }
         int totalNodes = mNodes.size();

         final ToIntBiFunction<Rect, Rect> majorAxis;
         final ToIntFunction<Rect> minorAxis;

         switch (direction) {
             case View.FOCUS_RIGHT:
                 majorAxis = (source, dest) -> dest.left - source.left;
                 minorAxis = Rect::centerY;
                 break;
             case View.FOCUS_LEFT:
                 majorAxis = (source, dest) -> source.left - dest.left;
                 minorAxis = Rect::centerY;
                 break;
             case View.FOCUS_UP:
                 majorAxis = (source, dest) -> source.top - dest.top;
                 minorAxis = Rect::centerX;
                 break;
             case View.FOCUS_DOWN:
                 majorAxis = (source, dest) -> dest.top - source.top;
                 minorAxis = Rect::centerX;
                 break;
             case View.FOCUS_FORWARD:
                 return mNodes.get((index + 1) % totalNodes);
             case View.FOCUS_BACKWARD:
                 return mNodes.get((index + totalNodes - 1) % totalNodes);
             default:
                 // Unknown direction
                 return null;
         }
         mCurrentSelection.populate(mTempNodeInfo).getBoundsInScreen(mTempRect);

         float minWeight = Float.MAX_VALUE;
         VirtualNodeInfo match = null;
         for (int i = 0; i < totalNodes; i++) {
             VirtualNodeInfo node = mNodes.get(i);
             node.populate(mTempNodeInfo).getBoundsInScreen(mTempRect2);

             int majorAxisWeight = majorAxis.applyAsInt(mTempRect, mTempRect2);
             if (majorAxisWeight <= 0) {
                 continue;
             }
             int minorAxisWeight = minorAxis.applyAsInt(mTempRect2)
                     - minorAxis.applyAsInt(mTempRect);

             float weight = majorAxisWeight * majorAxisWeight
                     + minorAxisWeight * minorAxisWeight * MINOR_AXIS_WEIGHT;
             if (weight < minWeight) {
                 minWeight = weight;
                 match = node;
             }
         }
         return match;
     }

     @Override
     public boolean onKeyUp(int keyCode, KeyEvent event) {
         if (keyCode == KeyEvent.KEYCODE_ENTER && mCurrentSelection != null) {
             mCurrentSelection.delegate.onPerformActionForVirtualView(
                     mCurrentSelection.id, AccessibilityNodeInfoCompat.ACTION_CLICK, null);
             return true;
         }
         return super.onKeyUp(keyCode, event);
     }

     /**
      * Shows the keyboard drag popup for the provided view
      */
     public void showForIcon(View icon, ItemInfo item, DragOptions dragOptions) {
         mIsOpen = true;
         mLauncher.getDragLayer().addView(this);
         mLauncher.getStateManager().addStateListener(this);

         // Find current selection
         CellLayout currentParent = (CellLayout) icon.getParent().getParent();
         float[] iconPos = new float[] {currentParent.getCellWidth() / 2,
                 currentParent.getCellHeight() / 2};
         Utilities.getDescendantCoordRelativeToAncestor(icon, currentParent, iconPos, false);

         ItemLongClickListener.beginDrag(icon, mLauncher, item, dragOptions);

         DragAndDropAccessibilityDelegate dndDelegate =
                 currentParent.getDragAndDropAccessibilityDelegate();
         setCurrentSelection(new VirtualNodeInfo(
                 dndDelegate, dndDelegate.getVirtualViewAt(iconPos[0], iconPos[1])));

         mLauncher.setDefaultKeyMode(Activity.DEFAULT_KEYS_DISABLE);
         requestFocus();
     }

     private static class VirtualNodeInfo {
         public final DragAndDropAccessibilityDelegate delegate;
         public final int id;

         VirtualNodeInfo(DragAndDropAccessibilityDelegate delegate, int id) {
             this.id = id;
             this.delegate = delegate;
         }

         @Override
         public boolean equals(Object o) {
             if (this == o) {
                 return true;
             }
             if (!(o instanceof VirtualNodeInfo)) {
                 return false;
             }
             VirtualNodeInfo that = (VirtualNodeInfo) o;
             return id == that.id && delegate.equals(that.delegate);
         }

         public AccessibilityNodeInfoCompat populate(AccessibilityNodeInfoCompat nodeInfo) {
             delegate.onPopulateNodeForVirtualView(id, nodeInfo);
             return nodeInfo;
         }

         public void getBounds(AccessibilityNodeInfoCompat nodeInfo, Rect out) {
             delegate.onPopulateNodeForVirtualView(id, nodeInfo);
             nodeInfo.getBoundsInScreen(out);
         }

         @Override
         public int hashCode() {
             return Objects.hash(id, delegate);
         }
     }

     private static class RectFocusIndicator extends ItemFocusIndicatorHelper<Rect> {

         RectFocusIndicator(View container) {
             super(container, Themes.getColorAccent(container.getContext()));
             mPaint.setStrokeWidth(container.getResources()
                     .getDimension(R.dimen.keyboard_drag_stroke_width));
             mPaint.setStyle(Style.STROKE);
         }

         @Override
         public void viewToRect(Rect item, Rect outRect) {
             outRect.set(item);
         }
     }
 }
	/*
	* Copyright (C) 2021 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.keyboard;

	import static android.app.Activity.DEFAULT_KEYS_SEARCH_LOCAL;

	import static com.android.launcher3.LauncherState.SPRING_LOADED;

	import android.app.Activity;
	import android.content.Context;
	import android.graphics.Canvas;
	import android.graphics.Paint.Style;
	import android.graphics.Rect;
	import android.graphics.RectF;
	import android.util.AttributeSet;
	import android.view.KeyEvent;
	import android.view.MotionEvent;
	import android.view.View;
	import android.view.ViewParent;
	import android.widget.TextView;

	import androidx.core.view.accessibility.AccessibilityNodeInfoCompat;

	import com.android.launcher3.AbstractFloatingView;
	import com.android.launcher3.CellLayout;
	import com.android.launcher3.Insettable;
	import com.android.launcher3.Launcher;
	import com.android.launcher3.LauncherState;
	import com.android.launcher3.PagedView;
	import com.android.launcher3.R;
	import com.android.launcher3.Utilities;
	import com.android.launcher3.accessibility.DragAndDropAccessibilityDelegate;
	import com.android.launcher3.dragndrop.DragOptions;
	import com.android.launcher3.folder.Folder;
	import com.android.launcher3.model.data.ItemInfo;
	import com.android.launcher3.statemanager.StateManager.StateListener;
	import com.android.launcher3.touch.ItemLongClickListener;
	import com.android.launcher3.util.Themes;

	import java.util.ArrayList;
	import java.util.Objects;
	import java.util.function.ToIntBiFunction;
	import java.util.function.ToIntFunction;

	/**
	* A floating view to allow keyboard navigation across virtual nodes
	*/
	public class KeyboardDragAndDropView extends AbstractFloatingView
	implements Insettable, StateListener<LauncherState> {

	private static final long MINOR_AXIS_WEIGHT = 13;

	private final ArrayList<Integer> mIntList = new ArrayList<>();
	private final ArrayList<DragAndDropAccessibilityDelegate> mDelegates = new ArrayList<>();
	private final ArrayList<VirtualNodeInfo> mNodes = new ArrayList<>();

	private final Rect mTempRect = new Rect();
	private final Rect mTempRect2 = new Rect();
	private final AccessibilityNodeInfoCompat mTempNodeInfo = AccessibilityNodeInfoCompat.obtain();

	private final RectFocusIndicator mFocusIndicator;

	private final Launcher mLauncher;
	private VirtualNodeInfo mCurrentSelection;


	public KeyboardDragAndDropView(Context context, AttributeSet attrs) {
	this(context, attrs, 0);
	}

	public KeyboardDragAndDropView(Context context, AttributeSet attrs, int defStyleAttr) {
	super(context, attrs, defStyleAttr);
	mLauncher = Launcher.getLauncher(context);
	mFocusIndicator = new RectFocusIndicator(this);
	setWillNotDraw(false);
	}

	@Override
	protected void handleClose(boolean animate) {
	mLauncher.getDragLayer().removeView(this);
	mLauncher.getStateManager().removeStateListener(this);
	mLauncher.setDefaultKeyMode(DEFAULT_KEYS_SEARCH_LOCAL);
	mIsOpen = false;
	}

	@Override
	protected boolean isOfType(int type) {
	return (type & TYPE_DRAG_DROP_POPUP) != 0;
	}

	@Override
	public boolean onControllerInterceptTouchEvent(MotionEvent ev) {
	// Consume all touch
	return true;
	}

	@Override
	public void setInsets(Rect insets) {
	setPadding(insets.left, insets.top, insets.right, insets.bottom);
	}

	@Override
	public void onStateTransitionStart(LauncherState toState) {
	if (toState != SPRING_LOADED) {
	close(false);
	}
	}

	@Override
	public void onStateTransitionComplete(LauncherState finalState) {
	if (mCurrentSelection != null) {
	setCurrentSelection(mCurrentSelection);
	}
	}

	private void setCurrentSelection(VirtualNodeInfo nodeInfo) {
	mCurrentSelection = nodeInfo;
	((TextView) findViewById(R.id.label))
	.setText(nodeInfo.populate(mTempNodeInfo).getContentDescription());

	Rect bounds = new Rect();
	mTempNodeInfo.getBoundsInParent(bounds);
	View host = nodeInfo.delegate.getHost();
	ViewParent parent = host.getParent();
	if (parent instanceof PagedView) {
	PagedView pv = (PagedView) parent;
	int pageIndex = pv.indexOfChild(host);

	pv.setCurrentPage(pageIndex);
	bounds.offset(pv.getScrollX() - pv.getScrollForPage(pageIndex), 0);
	}
	float[] pos = new float[] {bounds.left, bounds.top, bounds.right, bounds.bottom};
	Utilities.getDescendantCoordRelativeToAncestor(host, mLauncher.getDragLayer(), pos, true);

	new RectF(pos[0], pos[1], pos[2], pos[3]).roundOut(bounds);
	mFocusIndicator.changeFocus(bounds, true);
	}

	@Override
	protected void onDraw(Canvas canvas) {
	mFocusIndicator.draw(canvas);
	}

	@Override
	public boolean dispatchUnhandledMove(View focused, int direction) {
	VirtualNodeInfo nodeInfo = getNextSelection(direction);
	if (nodeInfo == null) {
	return false;
	}
	setCurrentSelection(nodeInfo);
	return true;
	}

	/**
	* Focus finding logic:
	* Collect all virtual nodes in reading order (used for forward and backwards).
	* Then find the closest view by comparing the distances spatially. Since it is a move
	* operation. consider all cell sizes to be approximately of the same size.
	*/
	private VirtualNodeInfo getNextSelection(int direction) {
	// Collect all virtual nodes
	mDelegates.clear();
	mNodes.clear();

	Folder openFolder = Folder.getOpen(mLauncher);
	PagedView pv = openFolder == null ? mLauncher.getWorkspace() : openFolder.getContent();
	int count = pv.getPageCount();
	for (int i = 0; i < count; i++) {
	mDelegates.add(((CellLayout) pv.getChildAt(i)).getDragAndDropAccessibilityDelegate());
	}
	if (openFolder == null) {
	mDelegates.add(pv.getNextPage() + 1,
	mLauncher.getHotseat().getDragAndDropAccessibilityDelegate());
	}
	mDelegates.forEach(delegate -> {
	mIntList.clear();
	delegate.getVisibleVirtualViews(mIntList);
	mIntList.forEach(id -> mNodes.add(new VirtualNodeInfo(delegate, id)));
	});

	if (mNodes.isEmpty()) {
	return null;
	}
	int index = mNodes.indexOf(mCurrentSelection);
	if (mCurrentSelection == null \|\| index < 0) {
	return null;
	}
	int totalNodes = mNodes.size();

	final ToIntBiFunction<Rect, Rect> majorAxis;
	final ToIntFunction<Rect> minorAxis;

	switch (direction) {
	case View.FOCUS_RIGHT:
	majorAxis = (source, dest) -> dest.left - source.left;
	minorAxis = Rect::centerY;
	break;
	case View.FOCUS_LEFT:
	majorAxis = (source, dest) -> source.left - dest.left;
	minorAxis = Rect::centerY;
	break;
	case View.FOCUS_UP:
	majorAxis = (source, dest) -> source.top - dest.top;
	minorAxis = Rect::centerX;
	break;
	case View.FOCUS_DOWN:
	majorAxis = (source, dest) -> dest.top - source.top;
	minorAxis = Rect::centerX;
	break;
	case View.FOCUS_FORWARD:
	return mNodes.get((index + 1) % totalNodes);
	case View.FOCUS_BACKWARD:
	return mNodes.get((index + totalNodes - 1) % totalNodes);
	default:
	// Unknown direction
	return null;
	}
	mCurrentSelection.populate(mTempNodeInfo).getBoundsInScreen(mTempRect);

	float minWeight = Float.MAX_VALUE;
	VirtualNodeInfo match = null;
	for (int i = 0; i < totalNodes; i++) {
	VirtualNodeInfo node = mNodes.get(i);
	node.populate(mTempNodeInfo).getBoundsInScreen(mTempRect2);

	int majorAxisWeight = majorAxis.applyAsInt(mTempRect, mTempRect2);
	if (majorAxisWeight <= 0) {
	continue;
	}
	int minorAxisWeight = minorAxis.applyAsInt(mTempRect2)
	- minorAxis.applyAsInt(mTempRect);

	float weight = majorAxisWeight * majorAxisWeight
	+ minorAxisWeight * minorAxisWeight * MINOR_AXIS_WEIGHT;
	if (weight < minWeight) {
	minWeight = weight;
	match = node;
	}
	}
	return match;
	}

	@Override
	public boolean onKeyUp(int keyCode, KeyEvent event) {
	if (keyCode == KeyEvent.KEYCODE_ENTER && mCurrentSelection != null) {
	mCurrentSelection.delegate.onPerformActionForVirtualView(
	mCurrentSelection.id, AccessibilityNodeInfoCompat.ACTION_CLICK, null);
	return true;
	}
	return super.onKeyUp(keyCode, event);
	}

	/**
	* Shows the keyboard drag popup for the provided view
	*/
	public void showForIcon(View icon, ItemInfo item, DragOptions dragOptions) {
	mIsOpen = true;
	mLauncher.getDragLayer().addView(this);
	mLauncher.getStateManager().addStateListener(this);

	// Find current selection
	CellLayout currentParent = (CellLayout) icon.getParent().getParent();
	float[] iconPos = new float[] {currentParent.getCellWidth() / 2,
	currentParent.getCellHeight() / 2};
	Utilities.getDescendantCoordRelativeToAncestor(icon, currentParent, iconPos, false);

	ItemLongClickListener.beginDrag(icon, mLauncher, item, dragOptions);

	DragAndDropAccessibilityDelegate dndDelegate =
	currentParent.getDragAndDropAccessibilityDelegate();
	setCurrentSelection(new VirtualNodeInfo(
	dndDelegate, dndDelegate.getVirtualViewAt(iconPos[0], iconPos[1])));

	mLauncher.setDefaultKeyMode(Activity.DEFAULT_KEYS_DISABLE);
	requestFocus();
	}

	private static class VirtualNodeInfo {
	public final DragAndDropAccessibilityDelegate delegate;
	public final int id;

	VirtualNodeInfo(DragAndDropAccessibilityDelegate delegate, int id) {
	this.id = id;
	this.delegate = delegate;
	}

	@Override
	public boolean equals(Object o) {
	if (this == o) {
	return true;
	}
	if (!(o instanceof VirtualNodeInfo)) {
	return false;
	}
	VirtualNodeInfo that = (VirtualNodeInfo) o;
	return id == that.id && delegate.equals(that.delegate);
	}

	public AccessibilityNodeInfoCompat populate(AccessibilityNodeInfoCompat nodeInfo) {
	delegate.onPopulateNodeForVirtualView(id, nodeInfo);
	return nodeInfo;
	}

	public void getBounds(AccessibilityNodeInfoCompat nodeInfo, Rect out) {
	delegate.onPopulateNodeForVirtualView(id, nodeInfo);
	nodeInfo.getBoundsInScreen(out);
	}

	@Override
	public int hashCode() {
	return Objects.hash(id, delegate);
	}
	}

	private static class RectFocusIndicator extends ItemFocusIndicatorHelper<Rect> {

	RectFocusIndicator(View container) {
	super(container, Themes.getColorAccent(container.getContext()));
	mPaint.setStrokeWidth(container.getResources()
	.getDimension(R.dimen.keyboard_drag_stroke_width));
	mPaint.setStyle(Style.STROKE);
	}

	@Override
	public void viewToRect(Rect item, Rect outRect) {
	outRect.set(item);
	}
	}
	}