Merge "Add a sysprop to disable SysUI's nav buttons when IME is shown"

core/java/android/inputmethodservice/InputMethodService.java

@@ -54,6 +54,7 @@ import static android.view.WindowInsets.Type.statusBars;
 
 import static java.lang.annotation.RetentionPolicy.SOURCE;
 
+import android.annotation.AnyThread;
 import android.annotation.CallSuper;
 import android.annotation.DrawableRes;
 import android.annotation.IntDef;
@@ -83,6 +84,7 @@ import android.os.Handler;
 import android.os.IBinder;
 import android.os.ResultReceiver;
 import android.os.SystemClock;
+import android.os.SystemProperties;
 import android.os.Trace;
 import android.provider.Settings;
 import android.text.InputType;
@@ -301,6 +303,44 @@ public class InputMethodService extends AbstractInputMethodService {
     static final String TAG = "InputMethodService";
     static final boolean DEBUG = false;
 
+    /**
+     * Key for a boolean value that tells whether {@link InputMethodService} is responsible for
+     * rendering the back button and the IME switcher button or not when the gestural navigation is
+     * enabled.
+     *
+     * <p>This sysprop is just ignored when the gestural navigation mode is not enabled.</p>
+     *
+     * <p>
+     * To avoid complexity that is not necessary for production, you always need to reboot the
+     * device after modifying this flag as follows:
+     * <pre>
+     * $ adb root
+     * $ adb shell setprop persist.sys.ime.can_render_gestural_nav_buttons true
+     * $ adb reboot
+     * </pre>
+     * </p>
+     */
+    private static final String PROP_CAN_RENDER_GESTURAL_NAV_BUTTONS =
+            "persist.sys.ime.can_render_gestural_nav_buttons";
+
+    /**
+     * Returns whether {@link InputMethodService} is responsible for rendering the back button and
+     * the IME switcher button or not when the gestural navigation is enabled.
+     *
+     * <p>This method is supposed to be used with an assumption that the same value is returned in
+     * other processes. It is developers' responsibility for rebooting the device when the sysprop
+     * is modified.</p>
+     *
+     * @return {@code true} if {@link InputMethodService} is responsible for rendering the back
+     * button and the IME switcher button when the gestural navigation is enabled.
+     *
+     * @hide
+     */
+    @AnyThread
+    public static boolean canImeRenderGesturalNavButtons() {
+        return SystemProperties.getBoolean(PROP_CAN_RENDER_GESTURAL_NAV_BUTTONS, false);
+    }
+
     /**
      * Allows the system to optimize the back button affordance based on the presence of software
      * keyboard.

packages/SystemUI/src/com/android/systemui/navigationbar/NavigationBarView.java

@@ -16,6 +16,7 @@
 
 package com.android.systemui.navigationbar;
 
+import static android.inputmethodservice.InputMethodService.canImeRenderGesturalNavButtons;
 import static android.view.WindowManagerPolicyConstants.NAV_BAR_MODE_GESTURAL;
 
 import static com.android.systemui.shared.system.QuickStepContract.SYSUI_STATE_HOME_DISABLED;
@@ -185,6 +186,17 @@ public class NavigationBarView extends FrameLayout implements
     @Nullable
     private Rect mOrientedHandleSamplingRegion;
 
+    /**
+     * {@code true} if the IME can render the back button and the IME switcher button.
+     *
+     * <p>The value must be used when and only when
+     * {@link com.android.systemui.shared.system.QuickStepContract#isGesturalMode(int)} returns
+     * {@code true}</p>
+     *
+     * <p>Cache the value here for better performance.</p>
+     */
+    private final boolean mImeCanRenderGesturalNavButtons = canImeRenderGesturalNavButtons();
+
     private class NavTransitionListener implements TransitionListener {
         private boolean mBackTransitioning;
         private boolean mHomeAppearing;
@@ -760,9 +772,14 @@ public class NavigationBarView extends FrameLayout implements
 
         updateRecentsIcon();
 
+        boolean isImeRenderingNavButtons = isGesturalMode(mNavBarMode)
+                && mImeCanRenderGesturalNavButtons;
+
         // Update IME button visibility, a11y and rotate button always overrides the appearance
-        mContextualButtonGroup.setButtonVisibility(R.id.ime_switcher,
-                (mNavigationIconHints & StatusBarManager.NAVIGATION_HINT_IME_SHOWN) != 0);
+        boolean disableImeSwitcher =
+                (mNavigationIconHints & StatusBarManager.NAVIGATION_HINT_IME_SHOWN) == 0
+                || isImeRenderingNavButtons;
+        mContextualButtonGroup.setButtonVisibility(R.id.ime_switcher, !disableImeSwitcher);
 
         mBarTransitions.reapplyDarkIntensity();
 
@@ -777,7 +794,8 @@ public class NavigationBarView extends FrameLayout implements
                 && ((mDisabledFlags & View.STATUS_BAR_DISABLE_HOME) != 0);
 
         boolean disableBack = !useAltBack && (mEdgeBackGestureHandler.isHandlingGestures()
-                || ((mDisabledFlags & View.STATUS_BAR_DISABLE_BACK) != 0));
+                || ((mDisabledFlags & View.STATUS_BAR_DISABLE_BACK) != 0))
+                || isImeRenderingNavButtons;
 
         // When screen pinning, don't hide back and home when connected service or back and
         // recents buttons when disconnected from launcher service in screen pinning mode,