Always recreate TaskbarActivityContext

- Add ENABLE_TASKBAR_NO_RECREATION flag
  When the flag is turned on,
  * Always destroy and recreate
  * Move task bar drag layer lifecycle from TaskbarActivityContext to TaskbarManager
  * Wrap the drag layer into a fullscreen root view

Note that in order to preserve the window across multiple TaskbarActivityContext creations, the inset types and ids must stay the same, so it's extracted out.

Bug: 274517647
Test: Fold and unfold a few times. Use a few applications. Make sure the task bar is visible and in the right place (tested with ENABLE_TASKBAR_NO_RECREATION and FLAG_HIDE_NAVBAR_WINDOW both on, both off, and one on and one off)
Change-Id: Ic3f0aa3d056fe178a53b76b2ad6cc6b9bffd5898

quickstep/src/com/android/launcher3/taskbar/TaskbarManager.java

@@ -23,6 +23,7 @@ import static android.view.WindowManager.LayoutParams.TYPE_NAVIGATION_BAR_PANEL;
 import static com.android.launcher3.LauncherPrefs.TASKBAR_PINNING;
 import static com.android.launcher3.LauncherPrefs.TASKBAR_PINNING_KEY;
 import static com.android.launcher3.LauncherState.OVERVIEW;
+import static com.android.launcher3.config.FeatureFlags.ENABLE_TASKBAR_NO_RECREATION;
 import static com.android.launcher3.util.DisplayController.TASKBAR_NOT_DESTROYED_TAG;
 import static com.android.launcher3.util.Executors.UI_HELPER_EXECUTOR;
 import static com.android.launcher3.util.FlagDebugUtils.formatFlagChange;
@@ -45,6 +46,8 @@ import android.os.Trace;
 import android.provider.Settings;
 import android.util.Log;
 import android.view.Display;
+import android.view.WindowManager;
+import android.widget.FrameLayout;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -104,6 +107,9 @@ public class TaskbarManager {
             Settings.Secure.NAV_BAR_KIDS_MODE);
 
     private final Context mContext;
+    private WindowManager mWindowManager;
+    private FrameLayout mTaskbarRootLayout;
+    private boolean mAddedWindow;
     private final TaskbarNavButtonController mNavButtonController;
     private final ComponentCallbacks mComponentCallbacks;
 
@@ -175,6 +181,10 @@ public class TaskbarManager {
         Display display =
                 service.getSystemService(DisplayManager.class).getDisplay(DEFAULT_DISPLAY);
         mContext = service.createWindowContext(display, TYPE_NAVIGATION_BAR_PANEL, null);
+        if (ENABLE_TASKBAR_NO_RECREATION.get()) {
+            mWindowManager = mContext.getSystemService(WindowManager.class);
+            mTaskbarRootLayout = new FrameLayout(mContext);
+        }
         mNavButtonController = new TaskbarNavButtonController(service,
                 SystemUiProxy.INSTANCE.get(mContext), new Handler());
         mComponentCallbacks = new ComponentCallbacks() {
@@ -256,10 +266,15 @@ public class TaskbarManager {
             LauncherPrefs.get(mContext).removeListener(mTaskbarPinningPreferenceChangeListener,
                     TASKBAR_PINNING);
             mTaskbarActivityContext.onDestroy();
-            if (!FLAG_HIDE_NAVBAR_WINDOW) {
+            if (!FLAG_HIDE_NAVBAR_WINDOW || ENABLE_TASKBAR_NO_RECREATION.get()) {
                 mTaskbarActivityContext = null;
             }
         }
+        DeviceProfile dp = mUserUnlocked ?
+                LauncherAppState.getIDP(mContext).getDeviceProfile(mContext) : null;
+        if (dp == null || !isTaskbarPresent(dp)) {
+            removeTaskbarRootViewFromWindow();
+        }
     }
 
     /**
@@ -308,6 +323,7 @@ public class TaskbarManager {
         mUserUnlocked = true;
         LauncherAppState.getIDP(mContext).addOnChangeListener(mIdpChangeListener);
         recreateTaskbar();
+        addTaskbarRootViewToWindow();
     }
 
     /**
@@ -388,10 +404,9 @@ public class TaskbarManager {
                 return;
             }
 
-            if (mTaskbarActivityContext == null) {
+            if (ENABLE_TASKBAR_NO_RECREATION.get() || mTaskbarActivityContext == null) {
                 mTaskbarActivityContext = new TaskbarActivityContext(mContext, dp,
-                    mNavButtonController,
-                    mUnfoldProgressProvider);
+                        mNavButtonController, mUnfoldProgressProvider);
             } else {
                 mTaskbarActivityContext.updateDeviceProfile(dp);
             }
@@ -402,6 +417,13 @@ public class TaskbarManager {
                     createTaskbarUIControllerForActivity(mActivity));
             }
 
+            if (ENABLE_TASKBAR_NO_RECREATION.get()) {
+                addTaskbarRootViewToWindow();
+                mTaskbarRootLayout.removeAllViews();
+                mTaskbarRootLayout.addView(mTaskbarActivityContext.getDragLayer());
+                mTaskbarActivityContext.notifyUpdateLayoutParams();
+            }
+
             // We to wait until user unlocks the device to attach listener.
             LauncherPrefs.get(mContext).addListener(mTaskbarPinningPreferenceChangeListener,
                 TASKBAR_PINNING);
@@ -523,6 +545,22 @@ public class TaskbarManager {
         }
     }
 
+    private void addTaskbarRootViewToWindow() {
+        if (ENABLE_TASKBAR_NO_RECREATION.get() && !mAddedWindow
+                && mTaskbarActivityContext != null) {
+            mWindowManager.addView(mTaskbarRootLayout,
+                    mTaskbarActivityContext.getWindowLayoutParams());
+            mAddedWindow = true;
+        }
+    }
+
+    private void removeTaskbarRootViewFromWindow() {
+        if (ENABLE_TASKBAR_NO_RECREATION.get() && mAddedWindow) {
+            mWindowManager.removeViewImmediate(mTaskbarRootLayout);
+            mAddedWindow = false;
+        }
+    }
+
     /** Temp logs for b/254119092. */
     public void debugWhyTaskbarNotDestroyed(String debugReason) {
         StringJoiner log = new StringJoiner("\n");