| /* |
| * Copyright (C) 2017 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 android.view.InputDevice.SOURCE_CLASS_POINTER; |
| import static android.view.MotionEvent.ACTION_CANCEL; |
| import static android.view.MotionEvent.ACTION_DOWN; |
| import static android.view.MotionEvent.ACTION_MOVE; |
| import static android.view.MotionEvent.ACTION_UP; |
| import static android.view.MotionEvent.BUTTON_STYLUS_PRIMARY; |
| import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_DRAG; |
| import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM; |
| |
| import android.os.Looper; |
| import android.util.Slog; |
| import android.view.InputChannel; |
| import android.view.InputDevice; |
| import android.view.InputEvent; |
| import android.view.InputEventReceiver; |
| import android.view.MotionEvent; |
| |
| /** |
| * Input receiver for drag and drop |
| */ |
| class DragInputEventReceiver extends InputEventReceiver { |
| private final WindowManagerService mService; |
| private final DragDropController mDragDropController; |
| |
| // Set, if stylus button was down at the start of the drag. |
| private boolean mStylusButtonDownAtStart; |
| // Indicates the first event to check for button state. |
| private boolean mIsStartEvent = true; |
| // Set to true to ignore input events after the drag gesture is complete but the drag events |
| // are still being dispatched. |
| private boolean mMuteInput = false; |
| |
| public DragInputEventReceiver(InputChannel inputChannel, Looper looper, |
| DragDropController controller, WindowManagerService service) { |
| super(inputChannel, looper); |
| mDragDropController = controller; |
| mService = service; |
| } |
| |
| @Override |
| public void onInputEvent(InputEvent event, int displayId) { |
| boolean handled = false; |
| try { |
| synchronized (mService.mWindowMap) { |
| if (!mDragDropController.dragDropActiveLocked()) { |
| // The drag has ended but the clean-up message has not been processed by |
| // window manager. Drop events that occur after this until window manager |
| // has a chance to clean-up the input handle. |
| handled = true; |
| return; |
| } |
| if (!(event instanceof MotionEvent) |
| || (event.getSource() & SOURCE_CLASS_POINTER) == 0 |
| || mMuteInput) { |
| return; |
| } |
| final MotionEvent motionEvent = (MotionEvent) event; |
| boolean endDrag = false; |
| final float newX = motionEvent.getRawX(); |
| final float newY = motionEvent.getRawY(); |
| final boolean isStylusButtonDown = |
| (motionEvent.getButtonState() & BUTTON_STYLUS_PRIMARY) != 0; |
| |
| if (mIsStartEvent) { |
| if (isStylusButtonDown) { |
| // First event and the button was down, check for the button being |
| // lifted in the future, if that happens we'll drop the item. |
| mStylusButtonDownAtStart = true; |
| } |
| mIsStartEvent = false; |
| } |
| |
| switch (motionEvent.getAction()) { |
| case ACTION_DOWN: { |
| if (DEBUG_DRAG) Slog.w(TAG_WM, "Unexpected ACTION_DOWN in drag layer"); |
| } |
| break; |
| |
| case ACTION_MOVE: { |
| if (mStylusButtonDownAtStart && !isStylusButtonDown) { |
| if (DEBUG_DRAG) { |
| Slog.d(TAG_WM, "Button no longer pressed; dropping at " |
| + newX + "," + newY); |
| } |
| mMuteInput = true; |
| endDrag = mDragDropController.mDragState |
| .notifyDropLocked(newX, newY); |
| } else { |
| // move the surface and tell the involved window(s) where we are |
| mDragDropController.mDragState.notifyMoveLocked(newX, newY); |
| } |
| } |
| break; |
| |
| case ACTION_UP: { |
| if (DEBUG_DRAG) { |
| Slog.d(TAG_WM, "Got UP on move channel; dropping at " |
| + newX + "," + newY); |
| } |
| mMuteInput = true; |
| endDrag = mDragDropController.mDragState |
| .notifyDropLocked(newX, newY); |
| } |
| break; |
| |
| case ACTION_CANCEL: { |
| if (DEBUG_DRAG) Slog.d(TAG_WM, "Drag cancelled!"); |
| mMuteInput = true; |
| endDrag = true; |
| } |
| break; |
| } |
| |
| if (endDrag) { |
| if (DEBUG_DRAG) |
| Slog.d(TAG_WM, "Drag ended; tearing down state"); |
| // tell all the windows that the drag has ended |
| // endDragLocked will post back to looper to dispose the receiver |
| // since we still need the receiver for the last finishInputEvent. |
| mDragDropController.mDragState.endDragLocked(); |
| mStylusButtonDownAtStart = false; |
| mIsStartEvent = true; |
| } |
| |
| handled = true; |
| } |
| } catch (Exception e) { |
| Slog.e(TAG_WM, "Exception caught by drag handleMotion", e); |
| } finally { |
| finishInputEvent(event, handled); |
| } |
| } |
| } |