Add a desktop mode API to hide stashed apps

Allows launcher to cancel selecting desktop app to be launched and hide
the stashed apps.

Bug: 261234402
Test: atest DesktopTasksControllerTest
Change-Id: I2708267011aca5b1c933dbf0172547ba1936c2ab

libs/WindowManager/Shell/src/com/android/wm/shell/desktopmode/DesktopModeController.java

@@ -514,6 +514,11 @@ public class DesktopModeController implements RemoteCallable<DesktopModeControll
             // Stashing of desktop apps not needed. Apps always launch on desktop
         }
 
+        @Override
+        public void hideStashedDesktopApps(int displayId) throws RemoteException {
+            // Stashing of desktop apps not needed. Apps always launch on desktop
+        }
+
         @Override
         public void setTaskListener(IDesktopTaskListener listener) throws RemoteException {
             // TODO(b/261234402): move visibility from sysui state to listener

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

@@ -131,6 +131,18 @@ class DesktopTasksController(
         desktopModeTaskRepository.setStashed(displayId, true)
     }
 
+    /**
+     * Clear the stashed state for the given display
+     */
+    fun hideStashedDesktopApps(displayId: Int) {
+        KtProtoLog.v(
+                WM_SHELL_DESKTOP_MODE,
+                "DesktopTasksController: hideStashedApps displayId=%d",
+                displayId
+        )
+        desktopModeTaskRepository.setStashed(displayId, false)
+    }
+
     /** Get number of tasks that are marked as visible */
     fun getVisibleTaskCount(displayId: Int): Int {
         return desktopModeTaskRepository.getVisibleTaskCount(displayId)
@@ -753,6 +765,13 @@ class DesktopTasksController(
             ) { c -> c.stashDesktopApps(displayId) }
         }
 
+        override fun hideStashedDesktopApps(displayId: Int) {
+            ExecutorUtils.executeRemoteCallWithTaskPermission(
+                    controller,
+                    "hideStashedDesktopApps"
+            ) { c -> c.hideStashedDesktopApps(displayId) }
+        }
+
         override fun getVisibleTaskCount(displayId: Int): Int {
             val result = IntArray(1)
             ExecutorUtils.executeRemoteCallWithTaskPermission(

libs/WindowManager/Shell/src/com/android/wm/shell/desktopmode/IDesktopMode.aidl

@@ -29,6 +29,9 @@ interface IDesktopMode {
     /** Stash apps on the desktop to allow launching another app from home screen */
     void stashDesktopApps(int displayId);
 
+    /** Hide apps that may be stashed */
+    void hideStashedDesktopApps(int displayId);
+
     /** Get count of visible desktop tasks on the given display */
     int getVisibleTaskCount(int displayId);
 

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

@@ -587,6 +587,17 @@ class DesktopTasksControllerTest : ShellTestCase() {
         assertThat(desktopModeTaskRepository.isStashed(SECOND_DISPLAY)).isFalse()
     }
 
+    @Test
+    fun hideStashedDesktopApps_stateUpdates() {
+        desktopModeTaskRepository.setStashed(DEFAULT_DISPLAY, true)
+        desktopModeTaskRepository.setStashed(SECOND_DISPLAY, true)
+        controller.hideStashedDesktopApps(DEFAULT_DISPLAY)
+
+        assertThat(desktopModeTaskRepository.isStashed(DEFAULT_DISPLAY)).isFalse()
+        // Check that second display is not affected
+        assertThat(desktopModeTaskRepository.isStashed(SECOND_DISPLAY)).isTrue()
+    }
+
     private fun setUpFreeformTask(displayId: Int = DEFAULT_DISPLAY): RunningTaskInfo {
         val task = createFreeformTask(displayId)
         whenever(shellTaskOrganizer.getRunningTaskInfo(task.taskId)).thenReturn(task)