diff options
Diffstat (limited to 'services/core/java/com/android/server/wm/DragState.java')
| -rw-r--r-- | services/core/java/com/android/server/wm/DragState.java | 441 |
1 files changed, 441 insertions, 0 deletions
diff --git a/services/core/java/com/android/server/wm/DragState.java b/services/core/java/com/android/server/wm/DragState.java new file mode 100644 index 0000000..edc7c93 --- /dev/null +++ b/services/core/java/com/android/server/wm/DragState.java @@ -0,0 +1,441 @@ +/* + * 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 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 android.content.ClipData; +import android.content.ClipDescription; +import android.graphics.Point; +import android.graphics.Region; +import android.os.IBinder; +import android.os.Message; +import android.os.Process; +import android.os.RemoteException; +import android.util.Slog; +import android.view.Display; +import android.view.DragEvent; +import android.view.InputChannel; +import android.view.SurfaceControl; +import android.view.View; +import android.view.WindowManager; + +import java.util.ArrayList; + +/** + * Drag/drop state + */ +class DragState { + final WindowManagerService mService; + IBinder mToken; + SurfaceControl mSurfaceControl; + int mFlags; + IBinder mLocalWin; + ClipData mData; + ClipDescription mDataDescription; + boolean mDragResult; + float mCurrentX, mCurrentY; + float mThumbOffsetX, mThumbOffsetY; + InputChannel mServerChannel, mClientChannel; + DragInputEventReceiver mInputEventReceiver; + InputApplicationHandle mDragApplicationHandle; + InputWindowHandle mDragWindowHandle; + WindowState mTargetWindow; + ArrayList<WindowState> mNotifiedWindows; + boolean mDragInProgress; + Display mDisplay; + + private final Region mTmpRegion = new Region(); + + 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) { + mDisplay = display; + if (WindowManagerService.DEBUG_DRAG) Slog.d(WindowManagerService.TAG, "registering drag input channel"); + if (mClientChannel != null) { + Slog.e(WindowManagerService.TAG, "Duplicate register of drag input channel"); + } else { + 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, + mDisplay.getDisplayId()); + mDragWindowHandle.name = "drag"; + mDragWindowHandle.inputChannel = mServerChannel; + mDragWindowHandle.layer = getDragLayerLw(); + mDragWindowHandle.layoutParamsFlags = 0; + mDragWindowHandle.layoutParamsPrivateFlags = 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(); + mDisplay.getRealSize(p); + mDragWindowHandle.frameRight = p.x; + mDragWindowHandle.frameBottom = p.y; + + // Pause rotations before a drag. + if (WindowManagerService.DEBUG_ORIENTATION) { + Slog.d(WindowManagerService.TAG, "Pausing rotation during drag"); + } + mService.pauseRotationLocked(); + } + } + + void unregister() { + if (WindowManagerService.DEBUG_DRAG) Slog.d(WindowManagerService.TAG, "unregistering drag input channel"); + if (mClientChannel == null) { + Slog.e(WindowManagerService.TAG, "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 (WindowManagerService.DEBUG_ORIENTATION) { + Slog.d(WindowManagerService.TAG, "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) { + // 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; + + if (WindowManagerService.DEBUG_DRAG) { + Slog.d(WindowManagerService.TAG, "broadcasting DRAG_STARTED at (" + touchX + ", " + touchY + ")"); + } + + final WindowList windows = mService.getWindowListLocked(mDisplay); + if (windows != null) { + final int N = windows.size(); + for (int i = 0; i < N; i++) { + sendDragStartedLw(windows.get(i), touchX, touchY, mDataDescription); + } + } + } + + /* helper - send a caller-provided event, presumed to be DRAG_STARTED, 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) { + // Don't actually send the event if the drag is supposed to be pinned + // to the originating window but 'newWin' is not that window. + if ((mFlags & View.DRAG_FLAG_GLOBAL) == 0) { + final IBinder winBinder = newWin.mClient.asBinder(); + if (winBinder != mLocalWin) { + if (WindowManagerService.DEBUG_DRAG) { + Slog.d(WindowManagerService.TAG, "Not dispatching local DRAG_STARTED to " + newWin); + } + return; + } + } + + if (mDragInProgress && newWin.isPotentialDragTarget()) { + DragEvent event = obtainDragEvent(newWin, DragEvent.ACTION_DRAG_STARTED, + touchX, touchY, null, desc, 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(WindowManagerService.TAG, "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(); + } + } + } + } + + /* helper - construct and send a 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 + for (WindowState ws : mNotifiedWindows) { + if (ws == newWin) { + return; + } + } + if (WindowManagerService.DEBUG_DRAG) { + Slog.d(WindowManagerService.TAG, "need to send DRAG_STARTED to new window " + newWin); + } + sendDragStartedLw(newWin, mCurrentX, mCurrentY, mDataDescription); + } + } + + void broadcastDragEndedLw() { + if (WindowManagerService.DEBUG_DRAG) { + Slog.d(WindowManagerService.TAG, "broadcasting DRAG_ENDED"); + } + DragEvent evt = DragEvent.obtain(DragEvent.ACTION_DRAG_ENDED, + 0, 0, null, null, null, mDragResult); + for (WindowState ws: mNotifiedWindows) { + try { + ws.mClient.dispatchDragEvent(evt); + } catch (RemoteException e) { + Slog.w(WindowManagerService.TAG, "Unable to drag-end window " + ws); + } + } + mNotifiedWindows.clear(); + mDragInProgress = false; + evt.recycle(); + } + + void endDragLw() { + mService.mDragState.broadcastDragEndedLw(); + + // stop intercepting input + mService.mDragState.unregister(); + mService.mInputMonitor.updateInputWindowsLw(true /*force*/); + + // free our resources and drop all the object references + mService.mDragState.reset(); + mService.mDragState = null; + } + + void notifyMoveLw(float x, float y) { + final int myPid = Process.myPid(); + + // Move the surface to the given touch + if (WindowManagerService.SHOW_LIGHT_TRANSACTIONS) Slog.i( + WindowManagerService.TAG, ">>> OPEN TRANSACTION notifyMoveLw"); + SurfaceControl.openTransaction(); + try { + mSurfaceControl.setPosition(x - mThumbOffsetX, y - mThumbOffsetY); + if (WindowManagerService.SHOW_TRANSACTIONS) Slog.i(WindowManagerService.TAG, " DRAG " + + mSurfaceControl + ": pos=(" + + (int)(x - mThumbOffsetX) + "," + (int)(y - mThumbOffsetY) + ")"); + } finally { + SurfaceControl.closeTransaction(); + if (WindowManagerService.SHOW_LIGHT_TRANSACTIONS) Slog.i( + WindowManagerService.TAG, "<<< CLOSE TRANSACTION notifyMoveLw"); + } + + // Tell the affected window + WindowState touchedWin = getTouchedWinAtPointLw(x, y); + if (touchedWin == null) { + if (WindowManagerService.DEBUG_DRAG) Slog.d(WindowManagerService.TAG, "No touched win at x=" + x + " y=" + y); + return; + } + if ((mFlags & View.DRAG_FLAG_GLOBAL) == 0) { + final IBinder touchedBinder = touchedWin.mClient.asBinder(); + if (touchedBinder != mLocalWin) { + // This drag is pinned only to the originating window, but the drag + // point is outside that window. Pretend it's over empty space. + touchedWin = null; + } + } + try { + // have we dragged over a new window? + if ((touchedWin != mTargetWindow) && (mTargetWindow != null)) { + if (WindowManagerService.DEBUG_DRAG) { + Slog.d(WindowManagerService.TAG, "sending DRAG_EXITED to " + mTargetWindow); + } + // force DRAG_EXITED_EVENT if appropriate + DragEvent evt = obtainDragEvent(mTargetWindow, DragEvent.ACTION_DRAG_EXITED, + x, y, null, null, null, false); + mTargetWindow.mClient.dispatchDragEvent(evt); + if (myPid != mTargetWindow.mSession.mPid) { + evt.recycle(); + } + } + if (touchedWin != null) { + if (false && WindowManagerService.DEBUG_DRAG) { + Slog.d(WindowManagerService.TAG, "sending DRAG_LOCATION to " + touchedWin); + } + DragEvent evt = obtainDragEvent(touchedWin, DragEvent.ACTION_DRAG_LOCATION, + x, y, null, null, null, false); + touchedWin.mClient.dispatchDragEvent(evt); + if (myPid != touchedWin.mSession.mPid) { + evt.recycle(); + } + } + } catch (RemoteException e) { + Slog.w(WindowManagerService.TAG, "can't send drag notification to windows"); + } + mTargetWindow = touchedWin; + } + + // Tell the drop target 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) { + WindowState touchedWin = getTouchedWinAtPointLw(x, y); + if (touchedWin == null) { + // "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 (WindowManagerService.DEBUG_DRAG) { + Slog.d(WindowManagerService.TAG, "sending DROP to " + touchedWin); + } + final int myPid = Process.myPid(); + final IBinder token = touchedWin.mClient.asBinder(); + DragEvent evt = obtainDragEvent(touchedWin, DragEvent.ACTION_DROP, x, y, + null, null, mData, 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(WindowManagerService.TAG, "can't send drop notification to win " + touchedWin); + return true; + } finally { + if (myPid != touchedWin.mSession.mPid) { + evt.recycle(); + } + } + mToken = token; + return false; + } + + // Find the visible, touch-deliverable window under the given point + private WindowState getTouchedWinAtPointLw(float xf, float yf) { + WindowState touchedWin = null; + final int x = (int) xf; + final int y = (int) yf; + + final WindowList windows = mService.getWindowListLocked(mDisplay); + if (windows == null) { + return null; + } + final int N = windows.size(); + for (int i = N - 1; i >= 0; i--) { + WindowState child = windows.get(i); + final int flags = child.mAttrs.flags; + if (!child.isVisibleLw()) { + // not visible == don't tell about drags + continue; + } + if ((flags & WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE) != 0) { + // not touchable == don't tell about drags + continue; + } + + child.getTouchableRegion(mTmpRegion); + + final int touchFlags = flags & + (WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE + | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL); + if (mTmpRegion.contains(x, y) || touchFlags == 0) { + // Found it + touchedWin = child; + break; + } + } + + return touchedWin; + } + + private static DragEvent obtainDragEvent(WindowState win, int action, + float x, float y, Object localState, + ClipDescription description, ClipData data, boolean result) { + float winX = x - win.mFrame.left; + float winY = y - win.mFrame.top; + if (win.mEnforceSizeCompat) { + winX *= win.mGlobalScale; + winY *= win.mGlobalScale; + } + return DragEvent.obtain(action, winX, winY, localState, description, data, result); + } +}
\ No newline at end of file |