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47 lines
1.9 KiB
C
47 lines
1.9 KiB
C
/*
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* Copyright (c) Contributors to the Open 3D Engine Project
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*
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* SPDX-License-Identifier: Apache-2.0 OR MIT
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*
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*/
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#ifndef _CRY_WINDOW_MESSAGE_HANDLER_H_
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#define _CRY_WINDOW_MESSAGE_HANDLER_H_
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#include "platform.h"
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#if defined(WIN32)
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#ifndef WIN32_LEAN_AND_MEAN
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#define WIN32_LEAN_AND_MEAN
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#endif
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#include <windows.h>
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// Summary:
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// Window message handler for Windows OS
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struct IWindowMessageHandler
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{
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// Summary:
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// The low-level pre-process message handler for Windows
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// This is called before TranslateMessage/DispatchMessage (which will eventually end up in the HandleMessage handler)
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// Typically, do not implement this function.
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virtual void PreprocessMessage([[maybe_unused]] HWND hWnd, [[maybe_unused]] UINT uMsg, [[maybe_unused]] WPARAM wParam, [[maybe_unused]] LPARAM lParam) {}
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// Summary:
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// The low-level window message handler for Windows
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// The return value specifies if the implementation wants to modify the message handling result
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// When returning true, the desired result value should be written through the pResult pointer
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// When returning false, the value stored through pResult (if any) is ignored
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// If more than one implementation write different results, the behavior is undefined
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// If none of the implementations write any result, the default OS result will be used instead
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// In general, return false if the handler doesn't care about the message, or only uses it for informational purposes
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virtual bool HandleMessage([[maybe_unused]] HWND hWnd, [[maybe_unused]] UINT uMsg, [[maybe_unused]] WPARAM wParam, [[maybe_unused]] LPARAM lParam, [[maybe_unused]] LRESULT* pResult) { return false; }
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};
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#else
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// Summary:
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// Dummy window message handler
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// This is used for platforms that don't use window message handlers
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struct IWindowMessageHandler
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{
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};
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#endif
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#endif
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