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// Copyright (c) 2011 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_VIEWS_CONTROLS_NATIVE_CONTROL_WIN_H_
#define UI_VIEWS_CONTROLS_NATIVE_CONTROL_WIN_H_
#pragma once
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_vector.h"
#include "ui/views/controls/native/native_view_host.h"
#include "ui/views/widget/child_window_message_processor.h"
namespace ui {
class ViewProp;
}
namespace views {
// A View that hosts a native Windows control.
class NativeControlWin : public ChildWindowMessageProcessor,
public NativeViewHost {
public:
NativeControlWin();
virtual ~NativeControlWin();
// Called by our subclassed window procedure when a WM_KEYDOWN message is
// received by the HWND created by an object derived from NativeControlWin.
// Returns true if the key was processed, false otherwise.
virtual bool OnKeyDown(int vkey) { return false; }
// Overridden from ChildWindowMessageProcessor:
virtual bool ProcessMessage(UINT message,
WPARAM w_param,
LPARAM l_param,
LRESULT* result) OVERRIDE;
// Overridden from View:
virtual void OnEnabledChanged() OVERRIDE;
protected:
virtual void ViewHierarchyChanged(bool is_add,
View* parent,
View* child) OVERRIDE;
virtual void VisibilityChanged(View* starting_from, bool is_visible) OVERRIDE;
virtual void OnFocus() OVERRIDE;
// Called by the containing NativeWidgetWin when a WM_CONTEXTMENU message is
// received from the HWND created by an object derived from NativeControlWin.
virtual void ShowContextMenu(const gfx::Point& location);
// Called when the NativeControlWin is attached to a View hierarchy with a
// valid Widget. The NativeControlWin should use this opportunity to create
// its associated HWND.
virtual void CreateNativeControl() = 0;
// MUST be called by the subclass implementation of |CreateNativeControl|
// immediately after creating the control HWND, otherwise it won't be attached
// to the NativeViewHost and will be effectively orphaned.
virtual void NativeControlCreated(HWND native_control);
// Returns additional extended style flags. When subclasses call
// CreateWindowEx in order to create the underlying control, they must OR the
// ExStyle parameter with the value returned by this function.
//
// We currently use this method in order to add flags such as WS_EX_LAYOUTRTL
// to the HWND for views with right-to-left UI layout.
DWORD GetAdditionalExStyle() const;
// TODO(xji): we use the following temporary function as we transition the
// various native controls to use the right set of RTL flags. This function
// will go away (and be replaced by GetAdditionalExStyle()) once all the
// controls are properly transitioned.
DWORD GetAdditionalRTLStyle() const;
private:
typedef ScopedVector<ui::ViewProp> ViewProps;
// Called by the containing NativeWidgetWin when a message of type
// WM_CTLCOLORBTN or WM_CTLCOLORSTATIC is sent from the HWND created by an
// object derived from NativeControlWin.
LRESULT GetControlColor(UINT message, HDC dc, HWND sender);
// Our subclass window procedure for the attached control.
static LRESULT CALLBACK NativeControlWndProc(HWND window,
UINT message,
WPARAM w_param,
LPARAM l_param);
// The window procedure before we subclassed.
WNDPROC original_wndproc_;
ViewProps props_;
DISALLOW_COPY_AND_ASSIGN(NativeControlWin);
};
} // namespace views
#endif // UI_VIEWS_CONTROLS_NATIVE_CONTROL_WIN_H_