76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
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// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_WIN_MESSAGE_WINDOW_H_
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#define BASE_WIN_MESSAGE_WINDOW_H_
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#include <windows.h>
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#include "base/base_export.h"
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#include "base/basictypes.h"
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#include "base/callback.h"
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#include "base/compiler_specific.h"
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#include "base/strings/string16.h"
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#include "base/threading/non_thread_safe.h"
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namespace base {
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namespace win {
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// Implements a message-only window.
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class BASE_EXPORT MessageWindow : public base::NonThreadSafe {
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public:
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// Used to register a process-wide message window class.
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class WindowClass;
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// Implement this callback to handle messages received by the message window.
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// If the callback returns |false|, the first four parameters are passed to
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// DefWindowProc(). Otherwise, |*result| is returned by the window procedure.
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typedef base::Callback<bool(UINT message,
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WPARAM wparam,
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LPARAM lparam,
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LRESULT* result)> MessageCallback;
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MessageWindow();
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~MessageWindow();
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// Creates a message-only window. The incoming messages will be passed by
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// |message_callback|. |message_callback| must outlive |this|.
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bool Create(const MessageCallback& message_callback);
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// Same as Create() but assigns the name to the created window.
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bool CreateNamed(const MessageCallback& message_callback,
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const string16& window_name);
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HWND hwnd() const { return window_; }
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// Retrieves a handle of the first message-only window with matching
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// |window_name|.
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static HWND FindWindow(const string16& window_name);
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private:
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// Give |WindowClass| access to WindowProc().
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friend class WindowClass;
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// Contains the actual window creation code.
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bool DoCreate(const MessageCallback& message_callback,
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const wchar_t* window_name);
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// Invoked by the OS to process incoming window messages.
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static LRESULT CALLBACK WindowProc(HWND hwnd, UINT message, WPARAM wparam,
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LPARAM lparam);
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// Invoked to handle messages received by the window.
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MessageCallback message_callback_;
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// Handle of the input window.
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HWND window_;
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DISALLOW_COPY_AND_ASSIGN(MessageWindow);
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};
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} // namespace win
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} // namespace base
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#endif // BASE_WIN_MESSAGE_WINDOW_H_
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