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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.Context;
import android.view.DragEvent;
import android.view.MotionEvent;
import com.android.launcher3.DropTarget.DragObject;
import com.android.launcher3.Utilities;
/**
* 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);
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());
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());
break;
case MotionEvent.ACTION_CANCEL:
mEventListener.onDriverDragCancel();
break;
}
return true;
}
public static DragDriver create(Context context, DragController dragController,
DragObject dragObject, DragOptions options) {
if (Utilities.ATLEAST_NOUGAT && 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 {
float mLastX = 0;
float mLastY = 0;
SystemDragDriver(DragController dragController, Context context, DragObject dragObject) {
super(dragController);
}
@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();
mEventListener.onDriverDragMove(event.getX(), event.getY());
mEventListener.onDriverDragEnd(mLastX, mLastY);
return true;
case DragEvent.ACTION_DRAG_EXITED:
mEventListener.onDriverDragExitWindow();
return true;
case DragEvent.ACTION_DRAG_ENDED:
mEventListener.onDriverDragCancel();
return true;
default:
return false;
}
}
}
/**
* Class for driving an internal (i.e. not using framework) drag/drop operation.
*/
class InternalDragDriver extends DragDriver {
InternalDragDriver(DragController dragController) {
super(dragController);
}
@Override
public boolean onDragEvent (DragEvent event) { return false; }
}
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