Add basic implementation of starting an intent on an unhandled drag

- Expose drags through DragAndDropController, DesktopModeController will
  listen for unhandled drag events and consume it to start the associated
  task

Bug: 320797628
Test: atest WMShellUnitTests
Change-Id: I9d114f58a3224299f3ccb060543533b6fbf4c9ff

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/BubbleController.java

@@ -481,7 +481,12 @@ public class BubbleController implements ConfigurationChangeListener,
                 });
 
         mOneHandedOptional.ifPresent(this::registerOneHandedState);
-        mDragAndDropController.addListener(this::collapseStack);
+        mDragAndDropController.addListener(new DragAndDropController.DragAndDropListener() {
+            @Override
+            public void onDragStarted() {
+                collapseStack();
+            }
+        });
 
         // Clear out any persisted bubbles on disk that no longer have a valid user.
         List<UserInfo> users = mUserManager.getAliveUsers();

libs/WindowManager/Shell/src/com/android/wm/shell/dagger/WMShellModule.java

@@ -498,6 +498,7 @@ public abstract class WMShellModule {
             ShellTaskOrganizer shellTaskOrganizer,
             SyncTransactionQueue syncQueue,
             RootTaskDisplayAreaOrganizer rootTaskDisplayAreaOrganizer,
+            DragAndDropController dragAndDropController,
             Transitions transitions,
             EnterDesktopTaskTransitionHandler enterDesktopTransitionHandler,
             ExitDesktopTaskTransitionHandler exitDesktopTransitionHandler,
@@ -506,14 +507,15 @@ public abstract class WMShellModule {
             @DynamicOverride DesktopModeTaskRepository desktopModeTaskRepository,
             LaunchAdjacentController launchAdjacentController,
             RecentsTransitionHandler recentsTransitionHandler,
+            MultiInstanceHelper multiInstanceHelper,
             @ShellMainThread ShellExecutor mainExecutor
     ) {
         return new DesktopTasksController(context, shellInit, shellCommandHandler, shellController,
                 displayController, shellTaskOrganizer, syncQueue, rootTaskDisplayAreaOrganizer,
-                transitions, enterDesktopTransitionHandler, exitDesktopTransitionHandler,
-                toggleResizeDesktopTaskTransitionHandler, dragToDesktopTransitionHandler,
-                desktopModeTaskRepository, launchAdjacentController, recentsTransitionHandler,
-                mainExecutor);
+                dragAndDropController, transitions, enterDesktopTransitionHandler,
+                exitDesktopTransitionHandler, toggleResizeDesktopTaskTransitionHandler,
+                dragToDesktopTransitionHandler, desktopModeTaskRepository, launchAdjacentController,
+                recentsTransitionHandler, multiInstanceHelper, mainExecutor);
     }
 
     @WMSingleton

libs/WindowManager/Shell/src/com/android/wm/shell/desktopmode/DesktopTasksController.kt

@@ -16,7 +16,10 @@
 
 package com.android.wm.shell.desktopmode
 
+import android.app.ActivityManager
 import android.app.ActivityManager.RunningTaskInfo
+import android.app.ActivityOptions
+import android.app.PendingIntent
 import android.app.WindowConfiguration.ACTIVITY_TYPE_HOME
 import android.app.WindowConfiguration.ACTIVITY_TYPE_STANDARD
 import android.app.WindowConfiguration.WINDOWING_MODE_FREEFORM
@@ -25,6 +28,7 @@ import android.app.WindowConfiguration.WINDOWING_MODE_MULTI_WINDOW
 import android.app.WindowConfiguration.WINDOWING_MODE_UNDEFINED
 import android.app.WindowConfiguration.WindowingMode
 import android.content.Context
+import android.content.Intent
 import android.graphics.Point
 import android.graphics.PointF
 import android.graphics.Rect
@@ -32,6 +36,7 @@ import android.graphics.Region
 import android.os.IBinder
 import android.os.SystemProperties
 import android.util.DisplayMetrics.DENSITY_DEFAULT
+import android.view.Display.DEFAULT_DISPLAY
 import android.view.SurfaceControl
 import android.view.WindowManager.TRANSIT_CHANGE
 import android.view.WindowManager.TRANSIT_NONE
@@ -49,6 +54,8 @@ import com.android.wm.shell.common.DisplayController
 import com.android.wm.shell.common.ExecutorUtils
 import com.android.wm.shell.common.ExternalInterfaceBinder
 import com.android.wm.shell.common.LaunchAdjacentController
+import com.android.wm.shell.common.MultiInstanceHelper
+import com.android.wm.shell.common.MultiInstanceHelper.Companion.getComponent
 import com.android.wm.shell.common.RemoteCallable
 import com.android.wm.shell.common.ShellExecutor
 import com.android.wm.shell.common.SingleInstanceRemoteListener
@@ -59,7 +66,9 @@ import com.android.wm.shell.common.split.SplitScreenConstants.SPLIT_POSITION_BOT
 import com.android.wm.shell.common.split.SplitScreenConstants.SPLIT_POSITION_TOP_OR_LEFT
 import com.android.wm.shell.desktopmode.DesktopModeTaskRepository.VisibleTasksListener
 import com.android.wm.shell.desktopmode.DragToDesktopTransitionHandler.DragToDesktopStateListener
+import com.android.wm.shell.draganddrop.DragAndDropController
 import com.android.wm.shell.protolog.ShellProtoLogGroup.WM_SHELL_DESKTOP_MODE
+import com.android.wm.shell.recents.RecentTasksController
 import com.android.wm.shell.recents.RecentsTransitionHandler
 import com.android.wm.shell.recents.RecentsTransitionStateListener
 import com.android.wm.shell.splitscreen.SplitScreenController
@@ -76,6 +85,7 @@ import com.android.wm.shell.windowdecor.OnTaskResizeAnimationListener
 import java.io.PrintWriter
 import java.util.concurrent.Executor
 import java.util.function.Consumer
+import java.util.function.Function
 
 /** Handles moving tasks in and out of desktop */
 class DesktopTasksController(
@@ -87,6 +97,7 @@ class DesktopTasksController(
         private val shellTaskOrganizer: ShellTaskOrganizer,
         private val syncQueue: SyncTransactionQueue,
         private val rootTaskDisplayAreaOrganizer: RootTaskDisplayAreaOrganizer,
+        private val dragAndDropController: DragAndDropController,
         private val transitions: Transitions,
         private val enterDesktopTaskTransitionHandler: EnterDesktopTaskTransitionHandler,
         private val exitDesktopTaskTransitionHandler: ExitDesktopTaskTransitionHandler,
@@ -96,8 +107,10 @@ class DesktopTasksController(
         private val desktopModeTaskRepository: DesktopModeTaskRepository,
         private val launchAdjacentController: LaunchAdjacentController,
         private val recentsTransitionHandler: RecentsTransitionHandler,
+        private val multiInstanceHelper: MultiInstanceHelper,
         @ShellMainThread private val mainExecutor: ShellExecutor
-) : RemoteCallable<DesktopTasksController>, Transitions.TransitionHandler {
+) : RemoteCallable<DesktopTasksController>, Transitions.TransitionHandler,
+    DragAndDropController.DragAndDropListener {
 
     private val desktopMode: DesktopModeImpl
     private var visualIndicator: DesktopModeVisualIndicator? = null
@@ -174,6 +187,7 @@ class DesktopTasksController(
                 }
             }
         )
+        dragAndDropController.addListener(this)
     }
 
     fun setOnTaskResizeAnimationListener(listener: OnTaskResizeAnimationListener) {
@@ -1023,6 +1037,50 @@ class DesktopTasksController(
         desktopModeTaskRepository.setExclusionRegionListener(listener, callbackExecutor)
     }
 
+    override fun onUnhandledDrag(
+        launchIntent: PendingIntent,
+        dragSurface: SurfaceControl,
+        onFinishCallback: Consumer<Boolean>
+    ): Boolean {
+        // TODO(b/320797628): Pass through which display we are dropping onto
+        val activeTasks = desktopModeTaskRepository.getActiveTasks(DEFAULT_DISPLAY)
+        if (!activeTasks.any { desktopModeTaskRepository.isVisibleTask(it) }) {
+            // Not currently in desktop mode, ignore the drop
+            return false
+        }
+
+        val launchComponent = getComponent(launchIntent)
+        if (!multiInstanceHelper.supportsMultiInstanceSplit(launchComponent)) {
+            // TODO(b/320797628): Should only return early if there is an existing running task, and
+            //                    notify the user as well. But for now, just ignore the drop.
+            KtProtoLog.v(WM_SHELL_DESKTOP_MODE, "Dropped intent does not support multi-instance")
+            return false
+        }
+
+        // Start a new transition to launch the app
+        val opts = ActivityOptions.makeBasic().apply {
+            launchWindowingMode = WINDOWING_MODE_FREEFORM
+            pendingIntentLaunchFlags =
+                Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_MULTIPLE_TASK
+            setPendingIntentBackgroundActivityStartMode(
+                ActivityOptions.MODE_BACKGROUND_ACTIVITY_START_ALLOWED)
+            isPendingIntentBackgroundActivityLaunchAllowedByPermission = true
+        }
+        val wct = WindowContainerTransaction()
+        wct.sendPendingIntent(launchIntent, null, opts.toBundle())
+        transitions.startTransition(TRANSIT_OPEN, wct, null /* handler */)
+
+        // Report that this is handled by the listener
+        onFinishCallback.accept(true)
+
+        // We've assumed responsibility of cleaning up the drag surface, so do that now
+        // TODO(b/320797628): Do an actual animation here for the drag surface
+        val t = SurfaceControl.Transaction()
+        t.remove(dragSurface)
+        t.apply()
+        return true
+    }
+
     private fun dump(pw: PrintWriter, prefix: String) {
         val innerPrefix = "$prefix  "
         pw.println("${prefix}DesktopTasksController")

libs/WindowManager/Shell/src/com/android/wm/shell/draganddrop/DragAndDropController.java

@@ -37,6 +37,7 @@ import static com.android.wm.shell.sysui.ShellSharedConstants.KEY_EXTRA_SHELL_DR
 
 import android.app.ActivityManager;
 import android.app.ActivityTaskManager;
+import android.app.PendingIntent;
 import android.content.ClipDescription;
 import android.content.ComponentCallbacks2;
 import android.content.Context;
@@ -77,6 +78,8 @@ import com.android.wm.shell.transition.Transitions;
 
 import java.io.PrintWriter;
 import java.util.ArrayList;
+import java.util.function.Consumer;
+import java.util.function.Function;
 
 /**
  * Handles the global drag and drop handling for the Shell.
@@ -103,12 +106,29 @@ public class DragAndDropController implements RemoteCallable<DragAndDropControll
     // Map of displayId -> per-display info
     private final SparseArray<PerDisplay> mDisplayDropTargets = new SparseArray<>();
 
+    // The current display if a drag is in progress
+    private int mActiveDragDisplay = -1;
+
     /**
-     * Listener called during drag events, currently just onDragStarted.
+     * Listener called during drag events.
      */
     public interface DragAndDropListener {
         /** Called when a drag has started. */
-        void onDragStarted();
+        default void onDragStarted() {}
+
+        /** Called when a drag has ended. */
+        default void onDragEnded() {}
+
+        /**
+         * Called when an unhandled drag has occurred. The impl must return true if it decides to
+         * handled the unhandled drag, and it must also call `onFinishCallback` to complete the
+         * drag.
+         */
+        default boolean onUnhandledDrag(@NonNull PendingIntent launchIntent,
+                @NonNull SurfaceControl dragSurface,
+                @NonNull Consumer<Boolean> onFinishCallback) {
+            return false;
+        }
     }
 
     public DragAndDropController(Context context,
@@ -180,10 +200,18 @@ public class DragAndDropController implements RemoteCallable<DragAndDropControll
         mListeners.remove(listener);
     }
 
-    private void notifyDragStarted() {
+    /**
+     * Notifies all listeners and returns whether any listener handled the callback.
+     */
+    private boolean notifyListeners(Function<DragAndDropListener, Boolean> callback) {
         for (int i = 0; i < mListeners.size(); i++) {
-            mListeners.get(i).onDragStarted();
+            boolean handled = callback.apply(mListeners.get(i));
+            if (handled) {
+                // Return once the callback reports it has handled it
+                return true;
+            }
         }
+        return false;
     }
 
     @Override
@@ -269,6 +297,7 @@ public class DragAndDropController implements RemoteCallable<DragAndDropControll
         }
 
         if (event.getAction() == ACTION_DRAG_STARTED) {
+            mActiveDragDisplay = displayId;
             pd.isHandlingDrag = DragUtils.canHandleDrag(event);
             ProtoLog.v(ShellProtoLogGroup.WM_SHELL_DRAG_AND_DROP,
                     "Clip description: handlingDrag=%b itemCount=%d mimeTypes=%s",
@@ -294,7 +323,11 @@ public class DragAndDropController implements RemoteCallable<DragAndDropControll
                 pd.dragSession.update();
                 pd.dragLayout.prepare(pd.dragSession, loggerSessionId);
                 setDropTargetWindowVisibility(pd, View.VISIBLE);
-                notifyDragStarted();
+                notifyListeners(l -> {
+                    l.onDragStarted();
+                    // Return false to continue dispatch to next listener
+                    return false;
+                });
                 break;
             case ACTION_DRAG_ENTERED:
                 pd.dragLayout.show();
@@ -328,6 +361,12 @@ public class DragAndDropController implements RemoteCallable<DragAndDropControll
                     });
                 }
                 mLogger.logEnd();
+                mActiveDragDisplay = -1;
+                notifyListeners(l -> {
+                    l.onDragEnded();
+                    // Return false to continue dispatch to next listener
+                    return false;
+                });
                 break;
         }
         return true;
@@ -341,6 +380,24 @@ public class DragAndDropController implements RemoteCallable<DragAndDropControll
         mTransitions.startTransition(WindowManager.TRANSIT_TO_FRONT, wct, null);
     }
 
+    @Override
+    public void onUnhandledDrop(@NonNull DragEvent dragEvent,
+            @NonNull Consumer<Boolean> onFinishCallback) {
+        final PendingIntent launchIntent = DragUtils.getLaunchIntent(dragEvent);
+        if (launchIntent == null) {
+            // No intent to launch, report that this is unhandled by the listener
+            onFinishCallback.accept(false);
+            return;
+        }
+
+        final boolean handled = notifyListeners(
+                l -> l.onUnhandledDrag(launchIntent, dragEvent.getDragSurface(), onFinishCallback));
+        if (!handled) {
+            // Nobody handled this, we still have to notify WM
+            onFinishCallback.accept(false);
+        }
+    }
+
     /**
      * Handles dropping on the drop target.
      */

libs/WindowManager/Shell/src/com/android/wm/shell/draganddrop/DragUtils.java

@@ -20,9 +20,14 @@ import static android.content.ClipDescription.MIMETYPE_APPLICATION_ACTIVITY;
 import static android.content.ClipDescription.MIMETYPE_APPLICATION_SHORTCUT;
 import static android.content.ClipDescription.MIMETYPE_APPLICATION_TASK;
 
+import android.app.PendingIntent;
+import android.content.ClipData;
 import android.content.ClipDescription;
 import android.view.DragEvent;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
 /** Collection of utility classes for handling drag and drop. */
 public class DragUtils {
     private static final String TAG = "DragUtils";
@@ -44,6 +49,31 @@ public class DragUtils {
                 || description.hasMimeType(MIMETYPE_APPLICATION_TASK);
     }
 
+    /**
+     * Returns a launchable intent in the given `DragEvent` or `null` if there is none.
+     */
+    @Nullable
+    public static PendingIntent getLaunchIntent(@NonNull DragEvent dragEvent) {
+        return getLaunchIntent(dragEvent.getClipData());
+    }
+
+    /**
+     * Returns a launchable intent in the given `ClipData` or `null` if there is none.
+     */
+    @Nullable
+    public static PendingIntent getLaunchIntent(@NonNull ClipData data) {
+        for (int i = 0; i < data.getItemCount(); i++) {
+            final ClipData.Item item = data.getItemAt(i);
+            if (item.getIntentSender() != null) {
+                final PendingIntent intent = new PendingIntent(item.getIntentSender().getTarget());
+                if (intent != null && intent.isActivity()) {
+                    return intent;
+                }
+            }
+        }
+        return null;
+    }
+
     /**
      * Returns a list of the mime types provided in the clip description.
      */

libs/WindowManager/Shell/src/com/android/wm/shell/draganddrop/GlobalDragListener.kt

@@ -30,6 +30,7 @@ import java.util.function.Consumer
 
 /**
  * Manages the listener and callbacks for unhandled global drags.
+ * This is only used by DragAndDropController and should not be used directly by other classes.
  */
 class GlobalDragListener(
     private val wmService: IWindowManager,

libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/desktopmode/DesktopTasksControllerTest.kt

@@ -48,12 +48,14 @@ import com.android.wm.shell.TestRunningTaskInfoBuilder
 import com.android.wm.shell.TestShellExecutor
 import com.android.wm.shell.common.DisplayController
 import com.android.wm.shell.common.LaunchAdjacentController
+import com.android.wm.shell.common.MultiInstanceHelper
 import com.android.wm.shell.common.ShellExecutor
 import com.android.wm.shell.common.SyncTransactionQueue
 import com.android.wm.shell.desktopmode.DesktopTestHelpers.Companion.createFreeformTask
 import com.android.wm.shell.desktopmode.DesktopTestHelpers.Companion.createFullscreenTask
 import com.android.wm.shell.desktopmode.DesktopTestHelpers.Companion.createHomeTask
 import com.android.wm.shell.desktopmode.DesktopTestHelpers.Companion.createSplitScreenTask
+import com.android.wm.shell.draganddrop.DragAndDropController
 import com.android.wm.shell.recents.RecentsTransitionHandler
 import com.android.wm.shell.recents.RecentsTransitionStateListener
 import com.android.wm.shell.splitscreen.SplitScreenController
@@ -106,6 +108,8 @@ class DesktopTasksControllerTest : ShellTestCase() {
     @Mock lateinit var desktopModeWindowDecoration: DesktopModeWindowDecoration
     @Mock lateinit var splitScreenController: SplitScreenController
     @Mock lateinit var recentsTransitionHandler: RecentsTransitionHandler
+    @Mock lateinit var dragAndDropController: DragAndDropController
+    @Mock lateinit var multiInstanceHelper: MultiInstanceHelper
 
     private lateinit var mockitoSession: StaticMockitoSession
     private lateinit var controller: DesktopTasksController
@@ -148,6 +152,7 @@ class DesktopTasksControllerTest : ShellTestCase() {
             shellTaskOrganizer,
             syncQueue,
             rootTaskDisplayAreaOrganizer,
+            dragAndDropController,
             transitions,
             enterDesktopTransitionHandler,
             exitDesktopTransitionHandler,
@@ -156,6 +161,7 @@ class DesktopTasksControllerTest : ShellTestCase() {
             desktopModeTaskRepository,
             launchAdjacentController,
             recentsTransitionHandler,
+            multiInstanceHelper,
             shellExecutor
         )
     }