Daichi Hirono | 52cb215 | 2017-09-11 15:29:42 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.server.wm; |
| 18 | |
| 19 | import static android.view.InputDevice.SOURCE_CLASS_POINTER; |
| 20 | import static android.view.MotionEvent.ACTION_CANCEL; |
| 21 | import static android.view.MotionEvent.ACTION_DOWN; |
| 22 | import static android.view.MotionEvent.ACTION_MOVE; |
| 23 | import static android.view.MotionEvent.ACTION_UP; |
| 24 | import static android.view.MotionEvent.BUTTON_STYLUS_PRIMARY; |
| 25 | import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_DRAG; |
| 26 | import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM; |
| 27 | |
| 28 | import android.os.Looper; |
| 29 | import android.util.Slog; |
| 30 | import android.view.InputChannel; |
| 31 | import android.view.InputDevice; |
| 32 | import android.view.InputEvent; |
| 33 | import android.view.InputEventReceiver; |
| 34 | import android.view.MotionEvent; |
| 35 | |
| 36 | /** |
| 37 | * Input receiver for drag and drop |
| 38 | */ |
| 39 | class DragInputEventReceiver extends InputEventReceiver { |
Daichi Hirono | 52cb215 | 2017-09-11 15:29:42 +0900 | [diff] [blame] | 40 | private final DragDropController mDragDropController; |
| 41 | |
| 42 | // Set, if stylus button was down at the start of the drag. |
| 43 | private boolean mStylusButtonDownAtStart; |
| 44 | // Indicates the first event to check for button state. |
| 45 | private boolean mIsStartEvent = true; |
| 46 | // Set to true to ignore input events after the drag gesture is complete but the drag events |
| 47 | // are still being dispatched. |
| 48 | private boolean mMuteInput = false; |
| 49 | |
Daichi Hirono | 768012e | 2017-10-30 10:05:37 +0900 | [diff] [blame] | 50 | DragInputEventReceiver(InputChannel inputChannel, Looper looper, |
| 51 | DragDropController controller) { |
Daichi Hirono | 52cb215 | 2017-09-11 15:29:42 +0900 | [diff] [blame] | 52 | super(inputChannel, looper); |
| 53 | mDragDropController = controller; |
Daichi Hirono | 52cb215 | 2017-09-11 15:29:42 +0900 | [diff] [blame] | 54 | } |
| 55 | |
| 56 | @Override |
| 57 | public void onInputEvent(InputEvent event, int displayId) { |
| 58 | boolean handled = false; |
| 59 | try { |
Daichi Hirono | 768012e | 2017-10-30 10:05:37 +0900 | [diff] [blame] | 60 | if (!(event instanceof MotionEvent) |
| 61 | || (event.getSource() & SOURCE_CLASS_POINTER) == 0 |
| 62 | || mMuteInput) { |
| 63 | return; |
Daichi Hirono | 52cb215 | 2017-09-11 15:29:42 +0900 | [diff] [blame] | 64 | } |
Daichi Hirono | 768012e | 2017-10-30 10:05:37 +0900 | [diff] [blame] | 65 | final MotionEvent motionEvent = (MotionEvent) event; |
| 66 | final float newX = motionEvent.getRawX(); |
| 67 | final float newY = motionEvent.getRawY(); |
| 68 | final boolean isStylusButtonDown = |
| 69 | (motionEvent.getButtonState() & BUTTON_STYLUS_PRIMARY) != 0; |
| 70 | |
| 71 | if (mIsStartEvent) { |
| 72 | // First event and the button was down, check for the button being |
| 73 | // lifted in the future, if that happens we'll drop the item. |
| 74 | mStylusButtonDownAtStart = isStylusButtonDown; |
| 75 | mIsStartEvent = false; |
| 76 | } |
| 77 | |
| 78 | switch (motionEvent.getAction()) { |
| 79 | case ACTION_DOWN: |
| 80 | if (DEBUG_DRAG) Slog.w(TAG_WM, "Unexpected ACTION_DOWN in drag layer"); |
| 81 | return; |
| 82 | case ACTION_MOVE: |
| 83 | if (mStylusButtonDownAtStart && !isStylusButtonDown) { |
| 84 | if (DEBUG_DRAG) { |
| 85 | Slog.d(TAG_WM, "Button no longer pressed; dropping at " + newX + "," |
| 86 | + newY); |
| 87 | } |
| 88 | mMuteInput = true; |
| 89 | } |
| 90 | break; |
| 91 | case ACTION_UP: |
| 92 | if (DEBUG_DRAG) { |
| 93 | Slog.d(TAG_WM, "Got UP on move channel; dropping at " + newX + "," + newY); |
| 94 | } |
| 95 | mMuteInput = true; |
| 96 | break; |
| 97 | case ACTION_CANCEL: |
| 98 | if (DEBUG_DRAG) Slog.d(TAG_WM, "Drag cancelled!"); |
| 99 | mMuteInput = true; |
| 100 | break; |
| 101 | default: |
| 102 | return; |
| 103 | } |
| 104 | |
| 105 | mDragDropController.handleMotionEvent(!mMuteInput /* keepHandling */, newX, newY); |
| 106 | handled = true; |
Daichi Hirono | 52cb215 | 2017-09-11 15:29:42 +0900 | [diff] [blame] | 107 | } catch (Exception e) { |
| 108 | Slog.e(TAG_WM, "Exception caught by drag handleMotion", e); |
| 109 | } finally { |
| 110 | finishInputEvent(event, handled); |
| 111 | } |
| 112 | } |
| 113 | } |