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/*
* Copyright (C) 2015 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.dragndrop;
import android.content.ClipData;
import android.content.ClipDescription;
import android.content.Context;
import android.content.Intent;
import android.view.DragEvent;
import android.view.MotionEvent;
import com.android.launcher3.DropTarget;
import com.android.launcher3.DropTarget.DragObject;
import com.android.launcher3.InstallShortcutReceiver;
import com.android.launcher3.ShortcutInfo;
import com.android.launcher3.Utilities;
import java.util.ArrayList;
/**
* Base class for driving a drag/drop operation.
*/
public abstract class DragDriver {
protected final EventListener mEventListener;
public interface EventListener {
void onDriverDragMove(float x, float y);
void onDriverDragExitWindow();
void onDriverDragEnd(float x, float y, DropTarget dropTargetOverride);
void onDriverDragCancel();
}
public DragDriver(EventListener eventListener) {
mEventListener = eventListener;
}
/**
* Handles ending of the DragView animation.
*/
public void onDragViewAnimationEnd() { }
public boolean onTouchEvent(MotionEvent ev) {
final int action = ev.getAction();
switch (action) {
case MotionEvent.ACTION_MOVE:
mEventListener.onDriverDragMove(ev.getX(), ev.getY());
break;
case MotionEvent.ACTION_UP:
mEventListener.onDriverDragMove(ev.getX(), ev.getY());
mEventListener.onDriverDragEnd(ev.getX(), ev.getY(), null);
break;
case MotionEvent.ACTION_CANCEL:
mEventListener.onDriverDragCancel();
break;
}
return true;
}
public abstract boolean onDragEvent (DragEvent event);
public boolean onInterceptTouchEvent(MotionEvent ev) {
final int action = ev.getAction();
switch (action) {
case MotionEvent.ACTION_UP:
mEventListener.onDriverDragEnd(ev.getX(), ev.getY(), null);
break;
case MotionEvent.ACTION_CANCEL:
mEventListener.onDriverDragCancel();
break;
}
return true;
}
public static DragDriver create(Context context, DragController dragController,
DragObject dragObject, DragOptions options) {
if (Utilities.isNycOrAbove() && options.systemDndStartPoint != null) {
return new SystemDragDriver(dragController, context, dragObject);
} else {
return new InternalDragDriver(dragController);
}
}
}
/**
* Class for driving a system (i.e. framework) drag/drop operation.
*/
class SystemDragDriver extends DragDriver {
private final DragObject mDragObject;
private final Context mContext;
boolean mReceivedDropEvent = false;
float mLastX = 0;
float mLastY = 0;
public SystemDragDriver(DragController dragController, Context context, DragObject dragObject) {
super(dragController);
mDragObject = dragObject;
mContext = context;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
return false;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
return false;
}
@Override
public boolean onDragEvent (DragEvent event) {
final int action = event.getAction();
switch (action) {
case DragEvent.ACTION_DRAG_STARTED:
mLastX = event.getX();
mLastY = event.getY();
return true;
case DragEvent.ACTION_DRAG_ENTERED:
return true;
case DragEvent.ACTION_DRAG_LOCATION:
mLastX = event.getX();
mLastY = event.getY();
mEventListener.onDriverDragMove(event.getX(), event.getY());
return true;
case DragEvent.ACTION_DROP:
mLastX = event.getX();
mLastY = event.getY();
mReceivedDropEvent =
updateInfoFromClipData(event.getClipData(), event.getClipDescription());
return mReceivedDropEvent;
case DragEvent.ACTION_DRAG_EXITED:
mEventListener.onDriverDragExitWindow();
return true;
case DragEvent.ACTION_DRAG_ENDED:
if (mReceivedDropEvent) {
mEventListener.onDriverDragEnd(mLastX, mLastY, null);
} else {
mEventListener.onDriverDragCancel();
}
return true;
default:
return false;
}
}
private boolean updateInfoFromClipData(ClipData data, ClipDescription desc) {
if (data == null) {
return false;
}
ArrayList<Intent> intents = new ArrayList<>();
int itemCount = data.getItemCount();
for (int i = 0; i < itemCount; i++) {
Intent intent = data.getItemAt(i).getIntent();
if (intent == null) {
continue;
}
// Give preference to shortcut intents.
if (!Intent.ACTION_CREATE_SHORTCUT.equals(intent.getAction())) {
intents.add(intent);
continue;
}
ShortcutInfo info = InstallShortcutReceiver.fromShortcutIntent(mContext, intent);
if (info != null) {
mDragObject.dragInfo = info;
return true;
}
return true;
}
// Try creating shortcuts just using the intent and label
Intent fullIntent = new Intent().putExtra(Intent.EXTRA_SHORTCUT_NAME, desc.getLabel());
for (Intent intent : intents) {
fullIntent.putExtra(Intent.EXTRA_SHORTCUT_INTENT, intent);
ShortcutInfo info = InstallShortcutReceiver.fromShortcutIntent(mContext, fullIntent);
if (info != null) {
mDragObject.dragInfo = info;
return true;
}
}
return false;
}
}
/**
* Class for driving an internal (i.e. not using framework) drag/drop operation.
*/
class InternalDragDriver extends DragDriver {
public InternalDragDriver(DragController dragController) {
super(dragController);
}
@Override
public boolean onDragEvent (DragEvent event) { return false; }
};
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