Support light navigation bar

In order to propagate the information about whether the IME is using
light navigation bar or not from

  android.view.ViewRootImpl

to

  android.inputmethodservice.NavigationBarController

within the same process, this CL adds a new @hide method to

  Window.Callback

as follows.

 ViewRootImpl#performTraversals()
  -> DecorView#onSystemBarAppearanceChanged()
   -> Window.Callback#onSystemBarAppearanceChanged()
    -> SoftInputWindow#onSystemBarAppearanceChanged()
     -> NavigationBarController#onSystemBarAppearanceChanged()

Button color transition will be implemented in a subsequent CL.

Bug: 215549533
Test: Manually tested with ThemedNavBarKeyboard sample
  1. Build aosp_coral-userdebug and flash it
  2. adb root
  3. adb shell setprop \
      persist.sys.ime.can_render_gestural_nav_buttons true
  4. adb reboot
  5. make -j ThemedNavBarKeyboard
  6. adb install -r \
      $OUT/system/app/ThemedNavBarKeyboard/ThemedNavBarKeyboard.apk
  7. adb shell ime enable \
      com.example.android.themednavbarkeyboard/.ThemedNavBarKeyboard
  8. adb shell ime set \
      com.example.android.themednavbarkeyboard/.ThemedNavBarKeyboard
  9. Open the Dialer app
 10. Focus in the top edit field.
 11. Tap "EXTENDED LIGHT NAVIGARION BAR" mode
 12. Make sure that the navigation button color is optimized for light
     navigation bar.
 13. Tap "STANDARD LIGHT NAVIGARION BAR" mode
 14. Make sure that the navigation button color is optimized for light
     navigation bar.
Change-Id: I08566034bebfafff6777ce0152cd6ca1f66f6cad

1 files changed, 47 insertions, 0 deletions

diff --git a/core/java/android/inputmethodservice/NavigationBarController.java b/core/java/android/inputmethodservice/NavigationBarController.java
index a6e475aeb813..2484cf079c56 100644
--- a/core/java/android/inputmethodservice/NavigationBarController.java
+++ b/core/java/android/inputmethodservice/NavigationBarController.java
@@ -17,7 +17,9 @@
 package android.inputmethodservice;
 
 import static android.content.Intent.ACTION_OVERLAY_CHANGED;
+import static android.view.WindowInsetsController.APPEARANCE_LIGHT_NAVIGATION_BARS;
 
+import android.annotation.FloatRange;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.app.StatusBarManager;
@@ -40,6 +42,7 @@ import android.view.ViewParent;
 import android.view.ViewTreeObserver;
 import android.view.Window;
 import android.view.WindowInsets;
+import android.view.WindowInsetsController.Appearance;
 import android.view.WindowManagerPolicyConstants;
 import android.widget.FrameLayout;
 
@@ -68,6 +71,9 @@ final class NavigationBarController {
         default void onDestroy() {
         }
 
+        default void onSystemBarAppearanceChanged(@Appearance int appearance) {
+        }
+
         default String toDebugString() {
             return "No-op implementation";
         }
@@ -100,6 +106,10 @@ final class NavigationBarController {
         mImpl.onDestroy();
     }
 
+    void onSystemBarAppearanceChanged(@Appearance int appearance) {
+        mImpl.onSystemBarAppearanceChanged(appearance);
+    }
+
     String toDebugString() {
         return mImpl.toDebugString();
     }
@@ -120,6 +130,9 @@ final class NavigationBarController {
         @Nullable
         private BroadcastReceiver mSystemOverlayChangedReceiver;
 
+        @Appearance
+        private int mAppearance;
+
         Impl(@NonNull InputMethodService inputMethodService) {
             mService = inputMethodService;
         }
@@ -187,6 +200,8 @@ final class NavigationBarController {
             }
 
             mNavigationBarFrame.setBackground(null);
+
+            setIconTintInternal(calculateTargetDarkIntensity(mAppearance));
         }
 
         private void uninstallNavigationBarFrameIfNecessary() {
@@ -389,9 +404,41 @@ final class NavigationBarController {
         }
 
         @Override
+        public void onSystemBarAppearanceChanged(@Appearance int appearance) {
+            if (mDestroyed) {
+                return;
+            }
+
+            mAppearance = appearance;
+
+            if (mNavigationBarFrame == null) {
+                return;
+            }
+
+            final float targetDarkIntensity = calculateTargetDarkIntensity(mAppearance);
+            setIconTintInternal(targetDarkIntensity);
+        }
+
+        private void setIconTintInternal(float darkIntensity) {
+            final NavigationBarView navigationBarView =
+                    mNavigationBarFrame.findViewByPredicate(NavigationBarView.class::isInstance);
+            if (navigationBarView == null) {
+                return;
+            }
+            navigationBarView.setDarkIntensity(darkIntensity);
+        }
+
+        @FloatRange(from = 0.0f, to = 1.0f)
+        private static float calculateTargetDarkIntensity(@Appearance int appearance) {
+            final boolean lightNavBar = (appearance & APPEARANCE_LIGHT_NAVIGATION_BARS) != 0;
+            return lightNavBar ? 1.0f : 0.0f;
+        }
+
+        @Override
         public String toDebugString() {
             return "{mRenderGesturalNavButtons=" + mRenderGesturalNavButtons
                     + " mNavigationBarFrame=" + mNavigationBarFrame
+                    + " mAppearance=0x" + Integer.toHexString(mAppearance)
                     + "}";
         }
     }