Merge "Support dead characters when key presses are shown" into main

2 files changed, 21 insertions, 1 deletions

diff --git a/core/java/android/view/KeyCharacterMap.java b/core/java/android/view/KeyCharacterMap.java
index 4fe53c2410f5..a8d4e2d2c70a 100644
--- a/core/java/android/view/KeyCharacterMap.java
+++ b/core/java/android/view/KeyCharacterMap.java
@@ -579,6 +579,17 @@ public class KeyCharacterMap implements Parcelable {
     }
 
     /**
+     * Get the combining character that corresponds with the provided accent.
+     *
+     * @param accent The accent character.  eg. '`'
+     * @return The combining character
+     * @hide
+     */
+    public static int getCombiningChar(int accent) {
+        return sAccentToCombining.get(accent);
+    }
+
+    /**
      * Describes the character mappings associated with a key.
      *
      * @deprecated instead use {@link KeyCharacterMap#getDisplayLabel(int)},
diff --git a/services/core/java/com/android/server/input/debug/FocusEventDebugView.java b/services/core/java/com/android/server/input/debug/FocusEventDebugView.java
index 6eec0dee9152..3ffd2e1dec71 100644
--- a/services/core/java/com/android/server/input/debug/FocusEventDebugView.java
+++ b/services/core/java/com/android/server/input/debug/FocusEventDebugView.java
@@ -34,6 +34,7 @@ import android.util.Slog;
 import android.util.TypedValue;
 import android.view.Gravity;
 import android.view.InputDevice;
+import android.view.KeyCharacterMap;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
 import android.view.RoundedCorner;
@@ -335,7 +336,15 @@ public class FocusEventDebugView extends RelativeLayout {
 
         final int unicodeChar = event.getUnicodeChar();
         if (unicodeChar != 0) {
-            return new String(Character.toChars(unicodeChar));
+            if ((unicodeChar & KeyCharacterMap.COMBINING_ACCENT) != 0) {
+                // Show combining character
+                final int combiningChar = KeyCharacterMap.getCombiningChar(
+                        unicodeChar & KeyCharacterMap.COMBINING_ACCENT_MASK);
+                // Return the Unicode dotted circle as part of the label as it is used is used to
+                // illustrate the effect of a combining marks
+                return "\u25cc" + String.valueOf((char) combiningChar);
+            }
+            return String.valueOf((char) unicodeChar);
         }
 
         final var label = KeyEvent.keyCodeToString(event.getKeyCode());