Revert "Migrate InputMethodService to use OnBackInvokedDispatcher"

This reverts commit 38be9e32f161828b3a8d3f4e0046af3213350622.

Reason for revert: Caused b/229642813 and b/229355440

Bug:229642813
Bug:229636388

Change-Id: I65e4f66ec2156d4e0812753d71ac82afd965fe3b

1 files changed, 0 insertions, 60 deletions

diff --git a/core/java/android/inputmethodservice/InputMethodService.java b/core/java/android/inputmethodservice/InputMethodService.java
index 6ece5efae537..4fdd53425328 100644
--- a/core/java/android/inputmethodservice/InputMethodService.java
+++ b/core/java/android/inputmethodservice/InputMethodService.java
@@ -101,7 +101,6 @@ import android.view.BatchedInputEventReceiver.SimpleBatchedInputEventReceiver;
 import android.view.Choreographer;
 import android.view.Gravity;
 import android.view.InputChannel;
-import android.view.InputDevice;
 import android.view.InputEventReceiver;
 import android.view.KeyCharacterMap;
 import android.view.KeyEvent;
@@ -135,10 +134,7 @@ import android.widget.FrameLayout;
 import android.widget.ImageButton;
 import android.widget.LinearLayout;
 import android.widget.TextView;
-import android.window.OnBackInvokedCallback;
-import android.window.OnBackInvokedDispatcher;
 import android.window.WindowMetricsHelper;
-import android.window.WindowOnBackInvokedDispatcher;
 
 import com.android.internal.annotations.GuardedBy;
 import com.android.internal.inputmethod.IInputContentUriToken;
@@ -349,9 +345,6 @@ public class InputMethodService extends AbstractInputMethodService {
      **/
     private RingBuffer<MotionEvent> mPendingEvents;
 
-    /** Callback to handle back invocation when IME window is shown. */
-    private OnBackInvokedCallback mBackCallback;
-
     /**
      * Returns whether {@link InputMethodService} is responsible for rendering the back button and
      * the IME switcher button or not when the gestural navigation is enabled.
@@ -1612,7 +1605,6 @@ public class InputMethodService extends AbstractInputMethodService {
     @Override public void onDestroy() {
         mDestroyed = true;
         super.onDestroy();
-        unregisterOnBackInvokedCallback();
         mRootView.getViewTreeObserver().removeOnComputeInternalInsetsListener(
                 mInsetsComputer);
         doFinishInput();
@@ -2587,7 +2579,6 @@ public class InputMethodService extends AbstractInputMethodService {
         cancelImeSurfaceRemoval();
         mInShowWindow = false;
         Trace.traceEnd(TRACE_TAG_WINDOW_MANAGER);
-        registerOnBackInvokedCallback();
     }
 
 
@@ -2634,56 +2625,6 @@ public class InputMethodService extends AbstractInputMethodService {
     }
 
     /**
-     * Registers an {@link OnBackInvokedCallback} to handle back invocation when ahead-of-time
-     *  back dispatching is enabled. We keep the KEYCODE_BACK based legacy code around to handle
-     *  back on older devices.
-     */
-    private void registerOnBackInvokedCallback() {
-        if (mBackCallback != null) {
-            // A back callback has already been registered.
-            return;
-        }
-        final ViewRootImpl viewRootImpl = mRootView == null ? null : mRootView.getViewRootImpl();
-        if (viewRootImpl != null && WindowOnBackInvokedDispatcher.isOnBackInvokedCallbackEnabled(
-                viewRootImpl.mContext)) {
-            final OnBackInvokedCallback callback = () -> {
-                KeyEvent downEvent = createKeyEvent(
-                        KeyEvent.ACTION_DOWN, false /* isTracking */);
-                onKeyDown(KeyEvent.KEYCODE_BACK, downEvent);
-                boolean hasStartedTracking =
-                        (downEvent.getFlags() & KeyEvent.FLAG_START_TRACKING) != 0;
-                KeyEvent upEvent = createKeyEvent(KeyEvent.ACTION_UP, hasStartedTracking);
-                onKeyUp(KeyEvent.KEYCODE_BACK, upEvent);
-            };
-            viewRootImpl.getOnBackInvokedDispatcher().registerOnBackInvokedCallback(
-                    OnBackInvokedDispatcher.PRIORITY_DEFAULT, callback);
-            mBackCallback = callback;
-        }
-    }
-
-    private KeyEvent createKeyEvent(int action, boolean isTracking) {
-        final long when = SystemClock.uptimeMillis();
-        return new KeyEvent(when, when, action,
-                KeyEvent.KEYCODE_BACK, 0 /* repeat */, 0 /* metaState */,
-                KeyCharacterMap.VIRTUAL_KEYBOARD, 0 /* scancode */,
-                KeyEvent.FLAG_FROM_SYSTEM | KeyEvent.FLAG_VIRTUAL_HARD_KEY
-                        | (isTracking ? KeyEvent.FLAG_TRACKING : 0),
-                InputDevice.SOURCE_KEYBOARD);
-    }
-
-    private void unregisterOnBackInvokedCallback() {
-        final ViewRootImpl viewRootImpl = mRootView == null ? null : mRootView.getViewRootImpl();
-        if (viewRootImpl != null
-                && mBackCallback != null
-                && WindowOnBackInvokedDispatcher.isOnBackInvokedCallbackEnabled(
-                viewRootImpl.mContext)) {
-            viewRootImpl.getOnBackInvokedDispatcher()
-                    .unregisterOnBackInvokedCallback(mBackCallback);
-        }
-        mBackCallback = null;
-    }
-
-    /**
      * Applies the IME visibility in {@link android.view.ImeInsetsSourceConsumer}.
      *
      * @param setVisible {@code true} to make it visible, false to hide it.
@@ -2728,7 +2669,6 @@ public class InputMethodService extends AbstractInputMethodService {
         }
         mLastWasInFullscreenMode = mIsFullscreen;
         updateFullscreenMode();
-        unregisterOnBackInvokedCallback();
     }
 
     /**