text input focus: Supports Window::GetFocusedTextInputClient.

ui/aura/window_delegate.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_AURA_WINDOW_DELEGATE_H_
 #define UI_AURA_WINDOW_DELEGATE_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "ui/aura/aura_export.h"
 #include "ui/events/event_constants.h"
 #include "ui/events/event_handler.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace gfx {
 class Canvas;
 class Path;
 class Point;
 class Rect;
 class Size;
 }
 
 namespace ui {
 class GestureEvent;
 class KeyEvent;
 class Layer;
 class MouseEvent;
+class TextInputClient;
 class Texture;
 class TouchEvent;
 }
 
 namespace aura {
 
 // Delegate interface for aura::Window.
 class AURA_EXPORT WindowDelegate : public ui::EventHandler {
  public:
   // Returns the window's minimum size, or size 0,0 if there is no limit.
   virtual gfx::Size GetMinimumSize() const = 0;
 
   // Returns the window's maximum size, or size 0,0 if there is no limit.
   virtual gfx::Size GetMaximumSize() const = 0;
 
   // Called when the Window's position and/or size changes.
   virtual void OnBoundsChanged(const gfx::Rect& old_bounds,
                                const gfx::Rect& new_bounds) = 0;
 
+  // Returns the focused text input client within this window.
+  // This function does not look at child windows.
+  virtual ui::TextInputClient* GetFocusedTextInputClient() = 0;
+
   // Returns the native cursor for the specified point, in window coordinates,
   // or NULL for the default cursor.
   virtual gfx::NativeCursor GetCursor(const gfx::Point& point) = 0;
 
   // Returns the non-client component (see hit_test.h) containing |point|, in
   // window coordinates.
   virtual int GetNonClientComponent(const gfx::Point& point) const = 0;
 
   // Returns true if event handling should descend into |child|. |location| is
   // in terms of the Window.
@@ skipping 43 matching lines @@
   // above returns true.
   virtual void GetHitTestMask(gfx::Path* mask) const = 0;
 
  protected:
   ~WindowDelegate() override {}
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_DELEGATE_H_