Improve the code for dynamic updates of the layout

Makefile

@@ -3,7 +3,7 @@
 PACKAGE_NAME = juloo.keyboard2
 
 ANDROID_PLATFORM_VERSION = android-30
-JAVA_VERSION = 1.7
+JAVA_VERSION = 1.8
 
 SRC_DIR = srcs
 ASSETS_DIR = assets

srcs/juloo.keyboard2/Config.java

@@ -8,6 +8,7 @@ import android.os.Build;
 import android.preference.PreferenceManager;
 import android.util.DisplayMetrics;
 import android.util.TypedValue;
+import android.view.KeyEvent;
 
 final class Config
 {
@@ -118,6 +119,36 @@ final class Config
     theme = getThemeId(res, prefs.getString("theme", ""));
   }
 
+  /** Update the layout according to the configuration.
+   *  - Remove the switching key if it isn't needed
+   *  - Remove keys from other locales
+   *  - Replace the action key to show the right label
+   *  - Swap the enter and action keys
+   */
+  public KeyboardData modify_layout(KeyboardData kw)
+  {
+    KeyValue action_key = (actionLabel == null) ? null :
+      new KeyValue(actionLabel, actionLabel, KeyValue.CHAR_NONE,
+          KeyValue.EVENT_ACTION, KeyValue.FLAG_NOREPEAT);
+    return kw.replaceKeys(key -> {
+      if (key == null)
+        return null;
+      switch (key.eventCode)
+      {
+        case KeyValue.EVENT_CHANGE_METHOD:
+          return shouldOfferSwitchingToNextInputMethod ? key : null;
+        case KeyEvent.KEYCODE_ENTER:
+          return (swapEnterActionKey && action_key != null) ? action_key : key;
+        case KeyValue.EVENT_ACTION:
+          return (swapEnterActionKey && action_key != null) ?
+            KeyValue.getKeyByName("enter") : action_key;
+        default:
+          if ((key.flags & key_flags_to_remove) != 0)
+            return null;
+          return key;
+      }});
+  }
+
   private float getDipPref(DisplayMetrics dm, SharedPreferences prefs, String pref_name, float def)
   {
     float value;

srcs/juloo.keyboard2/KeyValue.java

@@ -51,7 +51,6 @@ class KeyValue
   public static final int FLAG_ACCENT_MACRON = (1 << 27);
   public static final int FLAG_ACCENT_ORDINAL = (1 << 28);
 
-
   public static final int FLAGS_ACCENTS = FLAG_ACCENT1 | FLAG_ACCENT2 |
     FLAG_ACCENT3 | FLAG_ACCENT4 | FLAG_ACCENT5 | FLAG_ACCENT6 |
     FLAG_ACCENT_CARON | FLAG_ACCENT_MACRON | FLAG_ACCENT_SUPERSCRIPT |

srcs/juloo.keyboard2/Keyboard2View.java

@@ -55,28 +55,7 @@ public class Keyboard2View extends View
 
   public void setKeyboard(KeyboardData kw)
   {
-    if (!_config.shouldOfferSwitchingToNextInputMethod)
+    _keyboard = _config.modify_layout(kw);
-      kw = kw.replaceKeys(
-          new KeyboardData.ReplaceKeysByEvent(KeyValue.EVENT_CHANGE_METHOD, null));
-    if (_config.key_flags_to_remove != 0)
-      kw = kw.replaceKeys(
-          new KeyboardData.ReplaceKeysByFlags(_config.key_flags_to_remove, null));
-    // Replace the action key to show the right label.
-    KeyValue action_key = null; 
-    if (_config.actionLabel != null)
-    {
-      action_key = new KeyValue(_config.actionLabel, _config.actionLabel,
-          KeyValue.CHAR_NONE, KeyValue.EVENT_ACTION, KeyValue.FLAG_NOREPEAT);
-    }
-    if (_config.swapEnterActionKey && action_key != null)
-      kw = kw.replaceKeys(
-          new KeyboardData.ReplaceKeysByEvent2(KeyEvent.KEYCODE_ENTER,
-            action_key, KeyValue.EVENT_ACTION,
-            KeyValue.getKeyByName("enter")));
-    else
-      kw = kw.replaceKeys(
-          new KeyboardData.ReplaceKeysByEvent(KeyValue.EVENT_ACTION, action_key));
-    _keyboard = kw;
     reset();
   }
 

srcs/juloo.keyboard2/KeyboardData.java

@@ -6,6 +6,7 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.function.Function;
 
 class KeyboardData
 {
@@ -184,7 +185,8 @@ class KeyboardData
 
     public Key replaceKeys(MapKeys f)
     {
-      return new Key(f.map(key0), f.map(key1), f.map(key2), f.map(key3), f.map(key4), width, shift, edgekeys);
+      return new Key(f.apply(key0), f.apply(key1), f.apply(key2),
+          f.apply(key3), f.apply(key4), width, shift, edgekeys);
     }
 
     /** New key with the width multiplied by 's'. */
@@ -194,70 +196,7 @@ class KeyboardData
     }
   }
 
-  public static abstract interface MapKeys
+  public static abstract interface MapKeys extends Function<KeyValue, KeyValue> { }
-  {
-    public abstract KeyValue map(KeyValue k);
-  }
-
-  public static class ReplaceKeysByFlags implements MapKeys
-  {
-    private final int _flags;
-    private final KeyValue _replacement;
-
-    public ReplaceKeysByFlags(int flags, KeyValue r)
-    {
-      _flags = flags;
-      _replacement = r;
-    }
-
-    public KeyValue map(KeyValue k)
-    {
-      return (k != null && (k.flags & _flags) != 0) ? _replacement : k;
-    }
-  }
-
-  public static class ReplaceKeysByEvent implements MapKeys
-  {
-    private final int _eventCode;
-    private final KeyValue _replacement;
-
-    public ReplaceKeysByEvent(int ev, KeyValue r)
-    {
-      _eventCode = ev;
-      _replacement = r;
-    }
-
-    public KeyValue map(KeyValue k)
-    {
-      return (k != null && k.eventCode == _eventCode) ? _replacement : k;
-    }
-  }
-
-  /* Replace two keys at the same time. Used for swaping keys. */
-  public static class ReplaceKeysByEvent2 implements MapKeys
-  {
-    private final int _e1;
-    private final KeyValue _r1;
-    private final int _e2;
-    private final KeyValue _r2;
-
-    public ReplaceKeysByEvent2(int e1, KeyValue r1, int e2, KeyValue r2)
-    {
-      _e1 = e1;
-      _r1 = r1;
-      _e2 = e2;
-      _r2 = r2;
-    }
-
-    public KeyValue map(KeyValue k)
-    {
-      if (k == null)
-        return null;
-      if (k.eventCode == _e1) return _r1;
-      if (k.eventCode == _e2) return _r2;
-      return k;
-    }
-  }
 
   /** Parsing utils */