Add Drag and Drop states to RootList. (d811b8fd) · Commits · e / os / android_packages_apps_DocumentsUI

src/com/android/documentsui/DragAndDropHelper.java

0 → 100644

+54 −0

Original line number	Diff line number	Diff line
		/*
		* 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 com.android.documentsui;

		import static com.android.documentsui.base.Shared.DEBUG;

		import android.util.Log;

		import com.android.documentsui.base.DocumentInfo;

		import java.util.List;

		/**
		* A helper class for drag and drop operations
		*/
		public final class DragAndDropHelper {

		private static final String TAG = "DragAndDropHelper";

		private DragAndDropHelper() {}

		/**
		* Helper method to see whether an item can be dropped/copied into a particular destination.
		* Don't copy from the cwd into a provided list of prohibited directories. (ie. into cwd, into a
		* selected directory). Note: this currently doesn't work for multi-window drag, because
		* localState isn't carried over from one process to another.
		*/
		public static boolean canCopyTo(Object dragLocalState, DocumentInfo dst) {
		if (dragLocalState == null \|\| !(dragLocalState instanceof List<?>)) {
		if (DEBUG) Log.d(TAG, "Invalid local state object. Will allow copy.");
		return true;
		}
		List<?> src = (List<?>) dragLocalState;
		if (src.contains(dst)) {
		if (DEBUG) Log.d(TAG, "Drop target same as source. Ignoring.");
		return false;
		}
		return true;
		}
		}

src/com/android/documentsui/DrawerController.java

+5 −0

Original line number	Diff line number	Diff line
		@@ -166,6 +166,11 @@ public abstract class DrawerController implements DrawerListener {
		setOpen(true);
		}

		@Override
		public void onDragExited(View v, Object localState) {
		// do nothing
		}

		@Override
		public void onViewHovered(View v) {
		}

src/com/android/documentsui/HorizontalBreadcrumb.java

+5 −0

Original line number	Diff line number	Diff line
		@@ -130,6 +130,11 @@ public final class HorizontalBreadcrumb extends RecyclerView
		// do nothing
		}

		@Override
		public void onDragExited(View v, Object localState) {
		// do nothing
		}

		@Override
		public void onViewHovered(View v) {
		int pos = getChildAdapterPosition(v);

src/com/android/documentsui/ItemDragListener.java

+13 −1

Original line number	Diff line number	Diff line
		@@ -16,6 +16,8 @@

		package com.android.documentsui;

		import static com.android.documentsui.base.Shared.DEBUG;

		import android.content.ClipData;
		import android.graphics.drawable.Drawable;
		import android.util.Log;
		@@ -24,8 +26,10 @@ import android.view.View;
		import android.view.View.OnDragListener;

		import com.android.documentsui.ItemDragListener.DragHost;
		import com.android.documentsui.base.DocumentInfo;
		import com.android.internal.annotations.VisibleForTesting;

		import java.util.List;
		import java.util.Timer;
		import java.util.TimerTask;

		@@ -67,6 +71,8 @@ public class ItemDragListener<H extends DragHost> implements OnDragListener {
		handleLocationEvent(v, event.getX(), event.getY());
		return true;
		case DragEvent.ACTION_DRAG_EXITED:
		mDragHost.onDragExited(v, event.getLocalState());
		// fall through
		case DragEvent.ACTION_DRAG_ENDED:
		handleExitedEndedEvent(v, event);
		return true;
		@@ -97,7 +103,6 @@ public class ItemDragListener<H extends DragHost> implements OnDragListener {

		private void handleExitedEndedEvent(View v, DragEvent event) {
		mDragHost.setDropTargetHighlight(v, event.getLocalState(), false);

		TimerTask task = (TimerTask) v.getTag(R.id.drag_hovering_tag);
		if (task != null) {
		task.cancel();
		@@ -171,5 +176,12 @@ public class ItemDragListener<H extends DragHost> implements OnDragListener {
		* @param localState the Local state object given by DragEvent
		*/
		void onDragEntered(View v, Object localState);

		/**
		* Notifies right away when drag shadow exits the view
		* @param v the view which drop shadow just exited
		* @param localState the Local state object given by DragEvent
		*/
		void onDragExited(View v, Object localState);
		}
		}

src/com/android/documentsui/dirlist/DirectoryDragListener.java

+3 −6

Original line number	Diff line number	Diff line
		@@ -19,6 +19,7 @@ package com.android.documentsui.dirlist;
		import android.view.DragEvent;
		import android.view.View;

		import com.android.documentsui.DragAndDropHelper;
		import com.android.documentsui.ItemDragListener;

		import java.util.TimerTask;
		@@ -36,10 +37,6 @@ class DirectoryDragListener extends ItemDragListener<DirectoryFragment> {
		final boolean result = super.onDrag(v, event);

		switch (event.getAction()) {
		case DragEvent.ACTION_DRAG_EXITED:
		// If drag exits, we want to update drag and drop status on the drop shadow
		mDragHost.dragExited(v);
		break;
		case DragEvent.ACTION_DRAG_ENDED:
		// getResult() is true if drag was accepted
		mDragHost.dragStopped(event.getResult());
		@@ -58,7 +55,7 @@ class DirectoryDragListener extends ItemDragListener<DirectoryFragment> {

		@Override
		public @Nullable TimerTask createOpenTask(final View v, DragEvent event) {
		return mDragHost.canCopyTo(event.getLocalState(), v) ?
		super.createOpenTask(v, event) : null;
		return DragAndDropHelper.canCopyTo(event.getLocalState(), mDragHost.getDestination(v))
		? super.createOpenTask(v, event) : null;
		}
		}
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