/*
* Copyright (C) 2011 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.server.wm;
import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_DRAG;
import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_ORIENTATION;
import static com.android.server.wm.WindowManagerDebugConfig.SHOW_LIGHT_TRANSACTIONS;
import static com.android.server.wm.WindowManagerDebugConfig.SHOW_TRANSACTIONS;
import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM;
import android.content.ClipData;
import android.content.ClipDescription;
import android.content.Context;
import android.graphics.Matrix;
import android.graphics.Point;
import android.hardware.input.InputManager;
import android.os.Build;
import android.os.IBinder;
import android.os.Message;
import android.os.Process;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.UserHandle;
import android.os.UserManager;
import android.os.IUserManager;
import android.util.Slog;
import android.view.Display;
import android.view.DragEvent;
import android.view.InputChannel;
import android.view.InputDevice;
import android.view.PointerIcon;
import android.view.SurfaceControl;
import android.view.View;
import android.view.WindowManager;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.Interpolator;
import android.view.animation.ScaleAnimation;
import android.view.animation.Transformation;
import android.view.animation.TranslateAnimation;
import com.android.server.input.InputApplicationHandle;
import com.android.server.input.InputWindowHandle;
import com.android.server.wm.WindowManagerService.DragInputEventReceiver;
import com.android.server.wm.WindowManagerService.H;
import com.android.internal.view.IDragAndDropPermissions;
import java.util.ArrayList;
/**
* Drag/drop state
*/
class DragState {
private static final long ANIMATION_DURATION_MS = 500;
private static final int DRAG_FLAGS_URI_ACCESS = View.DRAG_FLAG_GLOBAL_URI_READ |
View.DRAG_FLAG_GLOBAL_URI_WRITE;
private static final int DRAG_FLAGS_URI_PERMISSIONS = DRAG_FLAGS_URI_ACCESS |
View.DRAG_FLAG_GLOBAL_PERSISTABLE_URI_PERMISSION |
View.DRAG_FLAG_GLOBAL_PREFIX_URI_PERMISSION;
final WindowManagerService mService;
IBinder mToken;
SurfaceControl mSurfaceControl;
int mFlags;
IBinder mLocalWin;
int mPid;
int mUid;
int mSourceUserId;
boolean mCrossProfileCopyAllowed;
ClipData mData;
ClipDescription mDataDescription;
int mTouchSource;
boolean mDragResult;
float mOriginalAlpha;
float mOriginalX, mOriginalY;
float mCurrentX, mCurrentY;
float mThumbOffsetX, mThumbOffsetY;
InputChannel mServerChannel, mClientChannel;
DragInputEventReceiver mInputEventReceiver;
InputApplicationHandle mDragApplicationHandle;
InputWindowHandle mDragWindowHandle;
WindowState mTargetWindow;
ArrayList<WindowState> mNotifiedWindows;
boolean mDragInProgress;
DisplayContent mDisplayContent;
private Animation mAnimation;
final Transformation mTransformation = new Transformation();
private final Interpolator mCubicEaseOutInterpolator = new DecelerateInterpolator(1.5f);
DragState(WindowManagerService service, IBinder token, SurfaceControl surface,
int flags, IBinder localWin) {
mService = service;
mToken = token;
mSurfaceControl = surface;
mFlags = flags;
mLocalWin = localWin;
mNotifiedWindows = new ArrayList<WindowState>();
}
void reset() {
if (mSurfaceControl != null) {
mSurfaceControl.destroy();
}
mSurfaceControl = null;
mFlags = 0;
mLocalWin = null;
mToken = null;
mData = null;
mThumbOffsetX = mThumbOffsetY = 0;
mNotifiedWindows = null;
}
/**
* @param display The Display that the window being dragged is on.
*/
void register(Display display) {
if (DEBUG_DRAG) Slog.d(TAG_WM, "registering drag input channel");
if (mClientChannel != null) {
Slog.e(TAG_WM, "Duplicate register of drag input channel");
} else {
mDisplayContent = mService.getDisplayContentLocked(display.getDisplayId());
InputChannel[] channels = InputChannel.openInputChannelPair("drag");
mServerChannel = channels[0];
mClientChannel = channels[1];
mService.mInputManager.registerInputChannel(mServerChannel, null);
mInputEventReceiver = mService.new DragInputEventReceiver(mClientChannel,
mService.mH.getLooper());
mDragApplicationHandle = new InputApplicationHandle(null);
mDragApplicationHandle.name = "drag";
mDragApplicationHandle.dispatchingTimeoutNanos =
WindowManagerService.DEFAULT_INPUT_DISPATCHING_TIMEOUT_NANOS;
mDragWindowHandle = new InputWindowHandle(mDragApplicationHandle, null,
display.getDisplayId());
mDragWindowHandle.name = "drag";
mDragWindowHandle.inputChannel = mServerChannel;
mDragWindowHandle.layer = getDragLayerLw();
mDragWindowHandle.layoutParamsFlags = 0;
mDragWindowHandle.layoutParamsType = WindowManager.LayoutParams.TYPE_DRAG;
mDragWindowHandle.dispatchingTimeoutNanos =
WindowManagerService.DEFAULT_INPUT_DISPATCHING_TIMEOUT_NANOS;
mDragWindowHandle.visible = true;
mDragWindowHandle.canReceiveKeys = false;
mDragWindowHandle.hasFocus = true;
mDragWindowHandle.hasWallpaper = false;
mDragWindowHandle.paused = false;
mDragWindowHandle.ownerPid = Process.myPid();
mDragWindowHandle.ownerUid = Process.myUid();
mDragWindowHandle.inputFeatures = 0;
mDragWindowHandle.scaleFactor = 1.0f;
// The drag window cannot receive new touches.
mDragWindowHandle.touchableRegion.setEmpty();
// The drag window covers the entire display
mDragWindowHandle.frameLeft = 0;
mDragWindowHandle.frameTop = 0;
Point p = new Point();
display.getRealSize(p);
mDragWindowHandle.frameRight = p.x;
mDragWindowHandle.frameBottom = p.y;
// Pause rotations before a drag.
if (DEBUG_ORIENTATION) {
Slog.d(TAG_WM, "Pausing rotation during drag");
}
mService.pauseRotationLocked();
}
}
void unregister() {
if (DEBUG_DRAG) Slog.d(TAG_WM, "unregistering drag input channel");
if (mClientChannel == null) {
Slog.e(TAG_WM, "Unregister of nonexistent drag input channel");
} else {
mService.mInputManager.unregisterInputChannel(mServerChannel);
mInputEventReceiver.dispose();
mInputEventReceiver = null;
mClientChannel.dispose();
mServerChannel.dispose();
mClientChannel = null;
mServerChannel = null;
mDragWindowHandle = null;
mDragApplicationHandle = null;
// Resume rotations after a drag.
if (DEBUG_ORIENTATION) {
Slog.d(TAG_WM, "Resuming rotation after drag");
}
mService.resumeRotationLocked();
}
}
int getDragLayerLw() {
return mService.mPolicy.windowTypeToLayerLw(WindowManager.LayoutParams.TYPE_DRAG)
* WindowManagerService.TYPE_LAYER_MULTIPLIER
+ WindowManagerService.TYPE_LAYER_OFFSET;
}
/* call out to each visible window/session informing it about the drag
*/
void broadcastDragStartedLw(final float touchX, final float touchY) {
mOriginalX = mCurrentX = touchX;
mOriginalY = mCurrentY = touchY;
// Cache a base-class instance of the clip metadata so that parceling
// works correctly in calling out to the apps.
mDataDescription = (mData != null) ? mData.getDescription() : null;
mNotifiedWindows.clear();
mDragInProgress = true;
mSourceUserId = UserHandle.getUserId(mUid);
final IUserManager userManager =
(IUserManager) ServiceManager.getService(Context.USER_SERVICE);
try {
mCrossProfileCopyAllowed = !userManager.getUserRestrictions(mSourceUserId).getBoolean(
UserManager.DISALLOW_CROSS_PROFILE_COPY_PASTE);
} catch (RemoteException e) {
Slog.e(TAG_WM, "Remote Exception calling UserManager: " + e);
mCrossProfileCopyAllowed = false;
}
if (DEBUG_DRAG) {
Slog.d(TAG_WM, "broadcasting DRAG_STARTED at (" + touchX + ", " + touchY + ")");
}
final WindowList windows = mDisplayContent.getWindowList();
final int N = windows.size();
for (int i = 0; i < N; i++) {
sendDragStartedLw(windows.get(i), touchX, touchY, mDataDescription);
}
}
/* helper - send a ACTION_DRAG_STARTED event, if the
* designated window is potentially a drop recipient. There are race situations
* around DRAG_ENDED broadcast, so we make sure that once we've declared that
* the drag has ended, we never send out another DRAG_STARTED for this drag action.
*
* This method clones the 'event' parameter if it's being delivered to the same
* process, so it's safe for the caller to call recycle() on the event afterwards.
*/
private void sendDragStartedLw(WindowState newWin, float touchX, float touchY,
ClipDescription desc) {
if (mDragInProgress && isValidDropTarget(newWin)) {
DragEvent event = obtainDragEvent(newWin, DragEvent.ACTION_DRAG_STARTED,
touchX, touchY, null, desc, null, null, false);
try {
newWin.mClient.dispatchDragEvent(event);
// track each window that we've notified that the drag is starting
mNotifiedWindows.add(newWin);
} catch (RemoteException e) {
Slog.w(TAG_WM, "Unable to drag-start window " + newWin);
} finally {
// if the callee was local, the dispatch has already recycled the event
if (Process.myPid() != newWin.mSession.mPid) {
event.recycle();
}
}
}
}
private boolean isValidDropTarget(WindowState targetWin) {
if (targetWin == null) {
return false;
}
if (!targetWin.isPotentialDragTarget()) {
return false;
}
if ((mFlags & View.DRAG_FLAG_GLOBAL) == 0 || !targetWindowSupportsGlobalDrag(targetWin)) {
// Drag is limited to the current window.
if (mLocalWin != targetWin.mClient.asBinder()) {
return false;
}
}
return mCrossProfileCopyAllowed ||
mSourceUserId == UserHandle.getUserId(targetWin.getOwningUid());
}
private boolean targetWindowSupportsGlobalDrag(WindowState targetWin) {
// Global drags are limited to system windows, and windows for apps that are targeting N and
// above.
return targetWin.mAppToken == null
|| targetWin.mAppToken.targetSdk >= Build.VERSION_CODES.N;
}
/* helper - send a ACTION_DRAG_STARTED event only if the window has not
* previously been notified, i.e. it became visible after the drag operation
* was begun. This is a rare case.
*/
void sendDragStartedIfNeededLw(WindowState newWin) {
if (mDragInProgress) {
// If we have sent the drag-started, we needn't do so again
if (isWindowNotified(newWin)) {
return;
}
if (DEBUG_DRAG) {
Slog.d(TAG_WM, "need to send DRAG_STARTED to new window " + newWin);
}
sendDragStartedLw(newWin, mCurrentX, mCurrentY, mDataDescription);
}
}
private boolean isWindowNotified(WindowState newWin) {
for (WindowState ws : mNotifiedWindows) {
if (ws == newWin) {
return true;
}
}
return false;
}
private void broadcastDragEndedLw() {
final int myPid = Process.myPid();
if (DEBUG_DRAG) {
Slog.d(TAG_WM, "broadcasting DRAG_ENDED");
}
for (WindowState ws : mNotifiedWindows) {
float x = 0;
float y = 0;
if (!mDragResult && (ws.mSession.mPid == mPid)) {
// Report unconsumed drop location back to the app that started the drag.
x = mCurrentX;
y = mCurrentY;
}
DragEvent evt = DragEvent.obtain(DragEvent.ACTION_DRAG_ENDED,
x, y, null, null, null, null, mDragResult);
try {
ws.mClient.dispatchDragEvent(evt);
} catch (RemoteException e) {
Slog.w(TAG_WM, "Unable to drag-end window " + ws);
}
// if the current window is in the same process,
// the dispatch has already recycled the event
if (myPid != ws.mSession.mPid) {
evt.recycle();
}
}
mNotifiedWindows.clear();
mDragInProgress = false;
}
void endDragLw() {
if (mAnimation != null) {
return;
}
if (!mDragResult) {
mAnimation = createReturnAnimationLocked();
mService.scheduleAnimationLocked();
return; // Will call cleanUpDragLw when the animation is done.
}
cleanUpDragLw();
}
void cancelDragLw() {
if (mAnimation != null) {
return;
}
mAnimation = createCancelAnimationLocked();
mService.scheduleAnimationLocked();
}
private void cleanUpDragLw() {
broadcastDragEndedLw();
if (isFromSource(InputDevice.SOURCE_MOUSE)) {
mService.restorePointerIconLocked(mDisplayContent, mCurrentX, mCurrentY);
}
// stop intercepting input
unregister();
// free our resources and drop all the object references
reset();
mService.mDragState = null;
mService.mInputMonitor.updateInputWindowsLw(true /*force*/);
}
void notifyMoveLw(float x, float y) {
if (mAnimation != null) {
return;
}
mCurrentX = x;
mCurrentY = y;
// Move the surface to the given touch
if (SHOW_LIGHT_TRANSACTIONS) Slog.i(
TAG_WM, ">>> OPEN TRANSACTION notifyMoveLw");
SurfaceControl.openTransaction();
try {
mSurfaceControl.setPosition(x - mThumbOffsetX, y - mThumbOffsetY);
if (SHOW_TRANSACTIONS) Slog.i(TAG_WM, " DRAG "
+ mSurfaceControl + ": pos=(" +
(int)(x - mThumbOffsetX) + "," + (int)(y - mThumbOffsetY) + ")");
} finally {
SurfaceControl.closeTransaction();
if (SHOW_LIGHT_TRANSACTIONS) Slog.i(
TAG_WM, "<<< CLOSE TRANSACTION notifyMoveLw");
}
notifyLocationLw(x, y);
}
void notifyLocationLw(float x, float y) {
// Tell the affected window
WindowState touchedWin = mDisplayContent.getTouchableWinAtPointLocked(x, y);
if (touchedWin != null && !isWindowNotified(touchedWin)) {
// The drag point is over a window which was not notified about a drag start.
// Pretend it's over empty space.
touchedWin = null;
}
try {
final int myPid = Process.myPid();
// have we dragged over a new window?
if ((touchedWin != mTargetWindow) && (mTargetWindow != null)) {
if (DEBUG_DRAG) {
Slog.d(TAG_WM, "sending DRAG_EXITED to " + mTargetWindow);
}
// force DRAG_EXITED_EVENT if appropriate
DragEvent evt = obtainDragEvent(mTargetWindow, DragEvent.ACTION_DRAG_EXITED,
0, 0, null, null, null, null, false);
mTargetWindow.mClient.dispatchDragEvent(evt);
if (myPid != mTargetWindow.mSession.mPid) {
evt.recycle();
}
}
if (touchedWin != null) {
if (false && DEBUG_DRAG) {
Slog.d(TAG_WM, "sending DRAG_LOCATION to " + touchedWin);
}
DragEvent evt = obtainDragEvent(touchedWin, DragEvent.ACTION_DRAG_LOCATION,
x, y, null, null, null, null, false);
touchedWin.mClient.dispatchDragEvent(evt);
if (myPid != touchedWin.mSession.mPid) {
evt.recycle();
}
}
} catch (RemoteException e) {
Slog.w(TAG_WM, "can't send drag notification to windows");
}
mTargetWindow = touchedWin;
}
// Find the drop target and tell it about the data. Returns 'true' if we can immediately
// dispatch the global drag-ended message, 'false' if we need to wait for a
// result from the recipient.
boolean notifyDropLw(float x, float y) {
if (mAnimation != null) {
return false;
}
mCurrentX = x;
mCurrentY = y;
WindowState touchedWin = mDisplayContent.getTouchableWinAtPointLocked(x, y);
if (!isWindowNotified(touchedWin)) {
// "drop" outside a valid window -- no recipient to apply a
// timeout to, and we can send the drag-ended message immediately.
mDragResult = false;
return true;
}
if (DEBUG_DRAG) {
Slog.d(TAG_WM, "sending DROP to " + touchedWin);
}
final int targetUserId = UserHandle.getUserId(touchedWin.getOwningUid());
DragAndDropPermissionsHandler dragAndDropPermissions = null;
if ((mFlags & View.DRAG_FLAG_GLOBAL) != 0 &&
(mFlags & DRAG_FLAGS_URI_ACCESS) != 0) {
dragAndDropPermissions = new DragAndDropPermissionsHandler(
mData,
mUid,
touchedWin.getOwningPackage(),
mFlags & DRAG_FLAGS_URI_PERMISSIONS,
mSourceUserId,
targetUserId);
}
if (mSourceUserId != targetUserId){
mData.fixUris(mSourceUserId);
}
final int myPid = Process.myPid();
final IBinder token = touchedWin.mClient.asBinder();
DragEvent evt = obtainDragEvent(touchedWin, DragEvent.ACTION_DROP, x, y,
null, null, mData, dragAndDropPermissions, false);
try {
touchedWin.mClient.dispatchDragEvent(evt);
// 5 second timeout for this window to respond to the drop
mService.mH.removeMessages(H.DRAG_END_TIMEOUT, token);
Message msg = mService.mH.obtainMessage(H.DRAG_END_TIMEOUT, token);
mService.mH.sendMessageDelayed(msg, 5000);
} catch (RemoteException e) {
Slog.w(TAG_WM, "can't send drop notification to win " + touchedWin);
return true;
} finally {
if (myPid != touchedWin.mSession.mPid) {
evt.recycle();
}
}
mToken = token;
return false;
}
private static DragEvent obtainDragEvent(WindowState win, int action,
float x, float y, Object localState,
ClipDescription description, ClipData data,
IDragAndDropPermissions dragAndDropPermissions,
boolean result) {
final float winX = win.translateToWindowX(x);
final float winY = win.translateToWindowY(y);
return DragEvent.obtain(action, winX, winY, localState, description, data,
dragAndDropPermissions, result);
}
boolean stepAnimationLocked(long currentTimeMs) {
if (mAnimation == null) {
return false;
}
mTransformation.clear();
if (!mAnimation.getTransformation(currentTimeMs, mTransformation)) {
cleanUpDragLw();
return false;
}
mTransformation.getMatrix().postTranslate(
mCurrentX - mThumbOffsetX, mCurrentY - mThumbOffsetY);
final float tmpFloats[] = mService.mTmpFloats;
mTransformation.getMatrix().getValues(tmpFloats);
mSurfaceControl.setPosition(tmpFloats[Matrix.MTRANS_X], tmpFloats[Matrix.MTRANS_Y]);
mSurfaceControl.setAlpha(mTransformation.getAlpha());
mSurfaceControl.setMatrix(tmpFloats[Matrix.MSCALE_X], tmpFloats[Matrix.MSKEW_Y],
tmpFloats[Matrix.MSKEW_X], tmpFloats[Matrix.MSCALE_Y]);
return true;
}
private Animation createReturnAnimationLocked() {
final AnimationSet set = new AnimationSet(false);
set.addAnimation(new TranslateAnimation(
0, mOriginalX - mCurrentX, 0, mOriginalY - mCurrentY));
set.addAnimation(new AlphaAnimation(mOriginalAlpha, mOriginalAlpha / 2));
set.setDuration(ANIMATION_DURATION_MS);
set.setInterpolator(mCubicEaseOutInterpolator);
set.initialize(0, 0, 0, 0);
set.start(); // Will start on the first call to getTransformation.
return set;
}
private Animation createCancelAnimationLocked() {
final AnimationSet set = new AnimationSet(false);
set.addAnimation(new ScaleAnimation(1, 0, 1, 0, mThumbOffsetX, mThumbOffsetY));
set.addAnimation(new AlphaAnimation(mOriginalAlpha, 0));
set.setDuration(ANIMATION_DURATION_MS);
set.setInterpolator(mCubicEaseOutInterpolator);
set.initialize(0, 0, 0, 0);
set.start(); // Will start on the first call to getTransformation.
return set;
}
private boolean isFromSource(int source) {
return (mTouchSource & source) == source;
}
void overridePointerIconLw(int touchSource) {
mTouchSource = touchSource;
if (isFromSource(InputDevice.SOURCE_MOUSE)) {
InputManager.getInstance().setPointerIconType(PointerIcon.TYPE_GRABBING);
}
}
}