Improve the auto capitalisation

- Detect when the input box is cleared
- Avoid looking up keys on the keyboard every time the shift state needs
  to change.

srcs/juloo.keyboard2/Autocapitalisation.java

@@ -108,6 +108,13 @@ final class Autocapitalisation
   {
     if (new_cursor == _cursor) // Just typing
       return;
+    if (new_cursor == 0)
+    {
+      // Detect whether the input box has been cleared
+      CharSequence t = _ic.getTextAfterCursor(1, 0);
+      if (t != null && t.equals(""))
+        _should_update_caps_mode = true;
+    }
     _cursor = new_cursor;
     _should_enable_shift = false;
     callback(true);

srcs/juloo.keyboard2/Keyboard2View.java

@@ -19,6 +19,8 @@ public class Keyboard2View extends View
   implements View.OnTouchListener, Pointers.IPointerEventHandler
 {
   private KeyboardData _keyboard;
+  private KeyValue _shift_kv;
+  private KeyboardData.Key _shift_key;
 
   private Pointers _pointers;
 
@@ -79,6 +81,13 @@ public class Keyboard2View extends View
   public void setKeyboard(KeyboardData kw)
   {
     _keyboard = _config.modify_layout(kw);
+    _shift_kv = KeyValue.getKeyByName("shift");
+    _shift_key = _keyboard.findKeyWithValue(_shift_kv);
+    if (_shift_key == null)
+    {
+      _shift_kv = _shift_kv.withFlags(_shift_kv.getFlags() | KeyValue.FLAG_LOCK);
+      _shift_key = _keyboard.findKeyWithValue(_shift_kv);
+    }
     reset();
   }
 
@@ -93,24 +102,13 @@ public class Keyboard2View extends View
   /** Called by auto-capitalisation. */
   public void set_shift_state(boolean state)
   {
-    if (_keyboard == null)
+    if (_keyboard == null || _shift_key == null)
       return;
-    KeyValue shift = KeyValue.getKeyByName("shift");
+    if (state)
-    KeyboardData.Key key = _keyboard.findKeyWithValue(shift);
+      _pointers.add_fake_pointer(_shift_kv, _shift_key);
-    if (key == null)
+    else
-    {
+      _pointers.remove_fake_pointer(_shift_kv, _shift_key);
-      // Lookup again for the lockable shift key, which is a different value.
+    invalidate();
-      shift = shift.withFlags(shift.getFlags() | KeyValue.FLAG_LOCK);
-      key = _keyboard.findKeyWithValue(shift);
-    }
-    if (key != null)
-    {
-      if (state)
-        _pointers.add_fake_pointer(shift, key);
-      else
-        _pointers.remove_fake_pointer(shift, key);
-      invalidate();
-    }
   }
 
   public KeyValue modifyKey(KeyValue k, Pointers.Modifiers mods)