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// Copyright (c) 2009 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 VIEWS_CONTROLS_NATIVE_CONTROL_WIN_H_
#define VIEWS_CONTROLS_NATIVE_CONTROL_WIN_H_
#include "views/controls/native/native_view_host.h"
namespace views {
// A View that hosts a native Windows control.
class NativeControlWin : public NativeViewHost {
public:
static const wchar_t* kNativeControlWinKey;
NativeControlWin();
virtual ~NativeControlWin();
// Called by the containing WidgetWin when a message is received from the HWND
// created by an object derived from NativeControlWin. Derived classes MUST
// call _this_ version of the function if they override it and do not handle
// all of the messages listed in widget_win.cc ProcessNativeControlWinMessage.
// Returns true if the message was handled, with a valid result in |result|.
// Returns false if the message was not handled.
virtual bool ProcessMessage(UINT message,
WPARAM w_param,
LPARAM l_param,
LRESULT* result);
// 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 View:
virtual void SetEnabled(bool enabled);
protected:
virtual void ViewHierarchyChanged(bool is_add, View *parent, View *child);
virtual void VisibilityChanged(View* starting_from, bool is_visible);
virtual void Focus();
// Called by the containing WidgetWin 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:
// Called by the containing WidgetWin when a message of type WM_CTLCOLORBTN or
// WM_CTLCOLORSTATIC is sent from the HWND created by an object dreived 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_;
DISALLOW_COPY_AND_ASSIGN(NativeControlWin);
};
} // namespace views
#endif // #ifndef VIEWS_CONTROLS_NATIVE_CONTROL_WIN_H_
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