Fixing keyboard input in imgui.

src/poly/ui/control.cc

@@ -83,6 +83,8 @@ void Control::OnKeyDown(KeyEvent& e) { on_key_down(e); }
 
 void Control::OnKeyUp(KeyEvent& e) { on_key_up(e); }
 
+void Control::OnKeyChar(KeyEvent& e) { on_key_char(e); }
+
 void Control::OnMouseDown(MouseEvent& e) { on_mouse_down(e); }
 
 void Control::OnMouseMove(MouseEvent& e) { on_mouse_move(e); }

src/poly/ui/control.h

@@ -77,6 +77,7 @@ class Control {
 
   poly::Delegate<KeyEvent> on_key_down;
   poly::Delegate<KeyEvent> on_key_up;
+  poly::Delegate<KeyEvent> on_key_char;
 
   poly::Delegate<MouseEvent> on_mouse_down;
   poly::Delegate<MouseEvent> on_mouse_move;
@@ -107,6 +108,7 @@ class Control {
 
   virtual void OnKeyDown(KeyEvent& e);
   virtual void OnKeyUp(KeyEvent& e);
+  virtual void OnKeyChar(KeyEvent& e);
 
   virtual void OnMouseDown(MouseEvent& e);
   virtual void OnMouseMove(MouseEvent& e);

src/poly/ui/win32/win32_control.cc

@@ -356,6 +356,9 @@ bool Win32Control::HandleKeyboard(UINT message, WPARAM wParam, LPARAM lParam) {
     case WM_KEYUP:
       OnKeyUp(e);
       break;
+    case WM_CHAR:
+      OnKeyChar(e);
+      break;
   }
   return e.is_handled();
 }