105 lines
2.7 KiB
C++
105 lines
2.7 KiB
C++
/*--------------------------------------------------------------------------*
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*
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* Microsoft Windows
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* Copyright (C) Microsoft Corporation, 1992 - 000
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*
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* File: smarticon.h
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*
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* Contents: Interface file for CSmartIcon
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*
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* History: 25-Jul-2000 jeffro Created
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*
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*--------------------------------------------------------------------------*/
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#pragma once
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#include <windows.h> // for HICON when building uicore.lib, which has no PCH
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#include "stddbg.h" // for ASSERT when building uicore.lib, which has no PCH
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/*+-------------------------------------------------------------------------*
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* class CSmartIcon
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*
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*
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* PURPOSE: A smart wrapper for icons. Destroys the icon when all references
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* to the icon are released.
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*
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*
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* USAGE: 1) Create the icon and assign to a smart icon:
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* smarticon.Attach(::CreateIcon(...));
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*
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* NOTE: The Attach method will destroy the icon if the underlying
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* CSmartIconData object cannot be created because of insufficient memory.
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*
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* 2) Smart icons can be treated as icons:
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* DrawIcon(..., smarticon, ...)
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*
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* 3) Smart icons can be assigned to one another just like handles:
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* smarticon1 = smarticon2;
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*
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*+-------------------------------------------------------------------------*/
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class CSmartIcon
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{
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public:
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CSmartIcon () : m_pData(NULL) {}
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~CSmartIcon ();
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CSmartIcon (const CSmartIcon& other);
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CSmartIcon& operator= (const CSmartIcon& rhs);
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void Attach (HICON hIcon);
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HICON Detach (); // let go without decrementing ref count
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void Release (); // let go, decrementing ref count
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operator HICON() const
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{
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return m_pData
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? m_pData->operator HICON()
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: NULL;
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}
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/*
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* for comparison to NULL (only)
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*/
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bool operator==(int null) const
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{
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ASSERT (null == 0);
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return (operator HICON() == NULL);
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}
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bool operator!=(int null) const
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{
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ASSERT (null == 0);
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return (operator HICON() != NULL);
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}
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private:
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class CSmartIconData
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{
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HICON m_hIcon;
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DWORD m_dwRefs;
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CSmartIconData(HICON hIcon) : m_hIcon(hIcon), m_dwRefs(1) {}
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~CSmartIconData()
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{
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if (m_hIcon != NULL)
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::DestroyIcon (m_hIcon);
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}
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public:
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static CSmartIconData* CreateInstance(HICON hIcon) { return new CSmartIconData(hIcon); }
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operator HICON() const { return m_hIcon; }
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HICON Detach();
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void AddRef() {++m_dwRefs;}
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void Release()
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{
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if((--m_dwRefs)==0)
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delete this;
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}
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};
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private:
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CSmartIconData* m_pData;
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};
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