Daichi Hirono | df5cf62 | 2017-09-11 14:59:26 +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.graphics.PixelFormat.TRANSLUCENT; |
| 20 | import static android.view.SurfaceControl.HIDDEN; |
| 21 | import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_DRAG; |
| 22 | import static com.android.server.wm.WindowManagerDebugConfig.SHOW_LIGHT_TRANSACTIONS; |
| 23 | import static com.android.server.wm.WindowManagerDebugConfig.SHOW_TRANSACTIONS; |
| 24 | import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM; |
| 25 | |
| 26 | import android.content.ClipData; |
| 27 | import android.os.Binder; |
| 28 | import android.os.Handler; |
| 29 | import android.os.IBinder; |
| 30 | import android.os.Message; |
| 31 | import android.util.Slog; |
| 32 | import android.view.Display; |
| 33 | import android.view.IWindow; |
| 34 | import android.view.Surface; |
| 35 | import android.view.Surface.OutOfResourcesException; |
| 36 | import android.view.SurfaceControl; |
| 37 | import android.view.SurfaceSession; |
| 38 | import android.view.View; |
| 39 | import com.android.server.wm.WindowManagerService.H; |
| 40 | |
| 41 | /** |
| 42 | * Managing drag and drop operations initiated by View#startDragAndDrop. |
| 43 | */ |
| 44 | class DragDropController { |
| 45 | private static final float DRAG_SHADOW_ALPHA_TRANSPARENT = .7071f; |
| 46 | private static final long DRAG_TIMEOUT_MS = 5000; |
| 47 | |
| 48 | IBinder prepareDrag(WindowManagerService service, SurfaceSession session, int callerPid, |
| 49 | int callerUid, IWindow window, int flags, int width, int height, Surface outSurface) { |
| 50 | if (DEBUG_DRAG) { |
| 51 | Slog.d(TAG_WM, "prepare drag surface: w=" + width + " h=" + height |
| 52 | + " flags=" + Integer.toHexString(flags) + " win=" + window |
| 53 | + " asbinder=" + window.asBinder()); |
| 54 | } |
| 55 | |
| 56 | IBinder token = null; |
| 57 | |
| 58 | synchronized (service.mWindowMap) { |
| 59 | try { |
| 60 | if (service.mDragState == null) { |
| 61 | // TODO(multi-display): support other displays |
| 62 | final DisplayContent displayContent = |
| 63 | service.getDefaultDisplayContentLocked(); |
| 64 | final Display display = displayContent.getDisplay(); |
| 65 | |
| 66 | SurfaceControl surface = new SurfaceControl(session, "drag surface", |
| 67 | width, height, TRANSLUCENT, HIDDEN); |
| 68 | surface.setLayerStack(display.getLayerStack()); |
| 69 | float alpha = 1; |
| 70 | if ((flags & View.DRAG_FLAG_OPAQUE) == 0) { |
| 71 | alpha = DRAG_SHADOW_ALPHA_TRANSPARENT; |
| 72 | } |
| 73 | surface.setAlpha(alpha); |
| 74 | |
| 75 | if (SHOW_TRANSACTIONS) Slog.i(TAG_WM, " DRAG " |
| 76 | + surface + ": CREATE"); |
| 77 | outSurface.copyFrom(surface); |
| 78 | final IBinder winBinder = window.asBinder(); |
| 79 | token = new Binder(); |
| 80 | service.mDragState = |
| 81 | new DragState(service, token, surface, flags, winBinder); |
| 82 | service.mDragState.mPid = callerPid; |
| 83 | service.mDragState.mUid = callerUid; |
| 84 | service.mDragState.mOriginalAlpha = alpha; |
| 85 | token = service.mDragState.mToken = new Binder(); |
| 86 | |
| 87 | // 5 second timeout for this window to actually begin the drag |
| 88 | service.mH.removeMessages(H.DRAG_START_TIMEOUT, winBinder); |
| 89 | Message msg = service.mH.obtainMessage(H.DRAG_START_TIMEOUT, winBinder); |
| 90 | service.mH.sendMessageDelayed(msg, DRAG_TIMEOUT_MS); |
| 91 | } else { |
| 92 | Slog.w(TAG_WM, "Drag already in progress"); |
| 93 | } |
| 94 | } catch (OutOfResourcesException e) { |
| 95 | Slog.e(TAG_WM, "Can't allocate drag surface w=" + width + " h=" + height, |
| 96 | e); |
| 97 | if (service.mDragState != null) { |
| 98 | service.mDragState.reset(); |
| 99 | service.mDragState = null; |
| 100 | } |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | return token; |
| 105 | } |
| 106 | |
| 107 | boolean performDrag(WindowManagerService service, IWindow window, IBinder dragToken, |
| 108 | int touchSource, float touchX, float touchY, float thumbCenterX, float thumbCenterY, |
| 109 | ClipData data) { |
| 110 | if (DEBUG_DRAG) { |
| 111 | Slog.d(TAG_WM, "perform drag: win=" + window + " data=" + data); |
| 112 | } |
| 113 | |
| 114 | synchronized (service.mWindowMap) { |
| 115 | if (service.mDragState == null) { |
| 116 | Slog.w(TAG_WM, "No drag prepared"); |
| 117 | throw new IllegalStateException("performDrag() without prepareDrag()"); |
| 118 | } |
| 119 | |
| 120 | if (dragToken != service.mDragState.mToken) { |
| 121 | Slog.w(TAG_WM, "Performing mismatched drag"); |
| 122 | throw new IllegalStateException("performDrag() does not match prepareDrag()"); |
| 123 | } |
| 124 | |
| 125 | final WindowState callingWin = service.windowForClientLocked(null, window, false); |
| 126 | if (callingWin == null) { |
| 127 | Slog.w(TAG_WM, "Bad requesting window " + window); |
| 128 | return false; // !!! TODO: throw here? |
| 129 | } |
| 130 | |
| 131 | // !!! TODO: if input is not still focused on the initiating window, fail |
| 132 | // the drag initiation (e.g. an alarm window popped up just as the application |
| 133 | // called performDrag() |
| 134 | |
| 135 | service.mH.removeMessages(H.DRAG_START_TIMEOUT, window.asBinder()); |
| 136 | |
| 137 | // !!! TODO: extract the current touch (x, y) in screen coordinates. That |
| 138 | // will let us eliminate the (touchX,touchY) parameters from the API. |
| 139 | |
| 140 | // !!! FIXME: put all this heavy stuff onto the mH looper, as well as |
| 141 | // the actual drag event dispatch stuff in the dragstate |
| 142 | |
| 143 | final DisplayContent displayContent = callingWin.getDisplayContent(); |
| 144 | if (displayContent == null) { |
| 145 | return false; |
| 146 | } |
| 147 | Display display = displayContent.getDisplay(); |
| 148 | service.mDragState.register(display); |
| 149 | if (!service.mInputManager.transferTouchFocus(callingWin.mInputChannel, |
| 150 | service.mDragState.getInputChannel())) { |
| 151 | Slog.e(TAG_WM, "Unable to transfer touch focus"); |
| 152 | service.mDragState.unregister(); |
| 153 | service.mDragState.reset(); |
| 154 | service.mDragState = null; |
| 155 | return false; |
| 156 | } |
| 157 | |
| 158 | service.mDragState.mDisplayContent = displayContent; |
| 159 | service.mDragState.mData = data; |
| 160 | service.mDragState.broadcastDragStartedLw(touchX, touchY); |
| 161 | service.mDragState.overridePointerIconLw(touchSource); |
| 162 | |
| 163 | // remember the thumb offsets for later |
| 164 | service.mDragState.mThumbOffsetX = thumbCenterX; |
| 165 | service.mDragState.mThumbOffsetY = thumbCenterY; |
| 166 | |
| 167 | // Make the surface visible at the proper location |
| 168 | final SurfaceControl surfaceControl = service.mDragState.mSurfaceControl; |
| 169 | if (SHOW_LIGHT_TRANSACTIONS) Slog.i( |
| 170 | TAG_WM, ">>> OPEN TRANSACTION performDrag"); |
| 171 | service.openSurfaceTransaction(); |
| 172 | try { |
| 173 | surfaceControl.setPosition(touchX - thumbCenterX, |
| 174 | touchY - thumbCenterY); |
| 175 | surfaceControl.setLayer(service.mDragState.getDragLayerLw()); |
| 176 | surfaceControl.setLayerStack(display.getLayerStack()); |
| 177 | surfaceControl.show(); |
| 178 | } finally { |
| 179 | service.closeSurfaceTransaction(); |
| 180 | if (SHOW_LIGHT_TRANSACTIONS) Slog.i( |
| 181 | TAG_WM, "<<< CLOSE TRANSACTION performDrag"); |
| 182 | } |
| 183 | |
| 184 | service.mDragState.notifyLocationLw(touchX, touchY); |
| 185 | } |
| 186 | |
| 187 | return true; // success! |
| 188 | } |
| 189 | |
| 190 | void reportDropResult(WindowManagerService service, IWindow window, boolean consumed) { |
| 191 | IBinder token = window.asBinder(); |
| 192 | if (DEBUG_DRAG) { |
| 193 | Slog.d(TAG_WM, "Drop result=" + consumed + " reported by " + token); |
| 194 | } |
| 195 | |
| 196 | synchronized (service.mWindowMap) { |
| 197 | if (service.mDragState == null) { |
| 198 | // Most likely the drop recipient ANRed and we ended the drag |
| 199 | // out from under it. Log the issue and move on. |
| 200 | Slog.w(TAG_WM, "Drop result given but no drag in progress"); |
| 201 | return; |
| 202 | } |
| 203 | |
| 204 | if (service.mDragState.mToken != token) { |
| 205 | // We're in a drag, but the wrong window has responded. |
| 206 | Slog.w(TAG_WM, "Invalid drop-result claim by " + window); |
| 207 | throw new IllegalStateException("reportDropResult() by non-recipient"); |
| 208 | } |
| 209 | |
| 210 | // The right window has responded, even if it's no longer around, |
| 211 | // so be sure to halt the timeout even if the later WindowState |
| 212 | // lookup fails. |
| 213 | service.mH.removeMessages(H.DRAG_END_TIMEOUT, window.asBinder()); |
| 214 | WindowState callingWin = service.windowForClientLocked(null, window, false); |
| 215 | if (callingWin == null) { |
| 216 | Slog.w(TAG_WM, "Bad result-reporting window " + window); |
| 217 | return; // !!! TODO: throw here? |
| 218 | } |
| 219 | |
| 220 | service.mDragState.mDragResult = consumed; |
| 221 | service.mDragState.endDragLw(); |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | void cancelDragAndDrop(WindowManagerService service, IBinder dragToken) { |
| 226 | if (DEBUG_DRAG) { |
| 227 | Slog.d(TAG_WM, "cancelDragAndDrop"); |
| 228 | } |
| 229 | |
| 230 | synchronized (service.mWindowMap) { |
| 231 | if (service.mDragState == null) { |
| 232 | Slog.w(TAG_WM, "cancelDragAndDrop() without prepareDrag()"); |
| 233 | throw new IllegalStateException("cancelDragAndDrop() without prepareDrag()"); |
| 234 | } |
| 235 | |
| 236 | if (service.mDragState.mToken != dragToken) { |
| 237 | Slog.w(TAG_WM, |
| 238 | "cancelDragAndDrop() does not match prepareDrag()"); |
| 239 | throw new IllegalStateException( |
| 240 | "cancelDragAndDrop() does not match prepareDrag()"); |
| 241 | } |
| 242 | |
| 243 | service.mDragState.mDragResult = false; |
| 244 | service.mDragState.cancelDragLw(); |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | void dragRecipientEntered(IWindow window) { |
| 249 | if (DEBUG_DRAG) { |
| 250 | Slog.d(TAG_WM, "Drag into new candidate view @ " + window.asBinder()); |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | void dragRecipientExited(IWindow window) { |
| 255 | if (DEBUG_DRAG) { |
| 256 | Slog.d(TAG_WM, "Drag from old candidate view @ " + window.asBinder()); |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | void handleMessage(WindowManagerService service, Message msg) { |
| 261 | switch (msg.what) { |
| 262 | case H.DRAG_START_TIMEOUT: { |
| 263 | IBinder win = (IBinder) msg.obj; |
| 264 | if (DEBUG_DRAG) { |
| 265 | Slog.w(TAG_WM, "Timeout starting drag by win " + win); |
| 266 | } |
| 267 | synchronized (service.mWindowMap) { |
| 268 | // !!! TODO: ANR the app that has failed to start the drag in time |
| 269 | if (service.mDragState != null) { |
| 270 | service.mDragState.unregister(); |
| 271 | service.mDragState.reset(); |
| 272 | service.mDragState = null; |
| 273 | } |
| 274 | } |
| 275 | break; |
| 276 | } |
| 277 | |
| 278 | case H.DRAG_END_TIMEOUT: { |
| 279 | IBinder win = (IBinder) msg.obj; |
| 280 | if (DEBUG_DRAG) { |
| 281 | Slog.w(TAG_WM, "Timeout ending drag to win " + win); |
| 282 | } |
| 283 | synchronized (service.mWindowMap) { |
| 284 | // !!! TODO: ANR the drag-receiving app |
| 285 | if (service.mDragState != null) { |
| 286 | service.mDragState.mDragResult = false; |
| 287 | service.mDragState.endDragLw(); |
| 288 | } |
| 289 | } |
| 290 | break; |
| 291 | } |
| 292 | |
| 293 | case H.TEAR_DOWN_DRAG_AND_DROP_INPUT: { |
| 294 | if (DEBUG_DRAG) |
| 295 | Slog.d(TAG_WM, "Drag ending; tearing down input channel"); |
| 296 | DragState.InputInterceptor interceptor = (DragState.InputInterceptor) msg.obj; |
| 297 | if (interceptor != null) { |
| 298 | synchronized (service.mWindowMap) { |
| 299 | interceptor.tearDown(); |
| 300 | } |
| 301 | } |
| 302 | break; |
| 303 | } |
| 304 | } |
| 305 | } |
| 306 | } |