// XThemeHelper.cpp Version 1.0
//
// Author: Hans Dietrich
// hdietrich@gmail.com
//
// Description:
// XThemeHelper implements CXThemeHelper, a singleton helper class that
// wraps the functions of UXTHEME.DLL.
//
// History
// Version 1.0 - 2005 March 22
// - Initial public release
//
// Public APIs:
// NAME DESCRIPTION
// ------------------------------ -------------------------------------------
// IsAppThemed() Reports whether the current application's
// user interface displays using visual styles.
// IsThemeActive() Tests if a visual style for the current
// application is active.
// IsThemeLibAvailable() Test whether UXTHEME.DLL (and its functions)
// are accessible.
// CloseThemeData() Closes the theme data handle.
// DrawThemeBackground() Draws the background image defined by the
// visual style for the specified control part.
// DrawThemeText() Draws text using the color and font
// defined by the visual style.
// GetThemeBackgroundContentRect() Retrieves the size of the content area
// for the background defined by the visual
// style.
// OpenThemeData() Opens the theme data for a window and
// its associated class.
//
// License:
// This software is released into the public domain. You are free to use
// it in any way you like, except that you may not sell this source code.
//
// This software is provided "as is" with no expressed or implied warranty.
// I accept no liability for any damage or loss of business that this
// software may cause.
//
///////////////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#define XTHEMEHELPER_CPP
#include "XThemeHelper.h"
///////////////////////////////////////////////////////////////////////////////
// class static data
PFNCLOSETHEMEDATA CXThemeHelper::m_CloseThemeData = NULL;
PFNDRAWTHEMEBACKGROUND CXThemeHelper::m_DrawThemeBackground = NULL;
PFNDRAWTHEMETEXT CXThemeHelper::m_DrawThemeText = NULL;
PFNGETTHEMEBACKGROUNDCONTENTRECT CXThemeHelper::m_GetThemeBackgroundContentRect = NULL;
PFNISAPPTHEMED CXThemeHelper::m_IsAppThemed = NULL;
PFNISTHEMEACTIVE CXThemeHelper::m_IsThemeActive = NULL;
PFNOPENTHEMEDATA CXThemeHelper::m_OpenThemeData = NULL;
HMODULE CXThemeHelper::m_hThemeLib = NULL;
BOOL CXThemeHelper::m_bThemeLibLoaded = FALSE;
int CXThemeHelper::m_nUseCount = 0;
///////////////////////////////////////////////////////////////////////////////
// ctor
CXThemeHelper::CXThemeHelper()
{
m_nUseCount++;
//TRACE(_T("in CXThemeHelper: m_nUseCount=%d\n"), m_nUseCount);
if (!m_bThemeLibLoaded)
{
Init();
}
else
{
//TRACE(_T("already initialized\n"));
}
}
///////////////////////////////////////////////////////////////////////////////
// Init
void CXThemeHelper::Init()
{
//TRACE(_T("in CXThemeHelper::Init\n"));
m_hThemeLib = LoadLibrary(_T("UXTHEME.DLL"));
if (m_hThemeLib)
{
m_CloseThemeData = (PFNCLOSETHEMEDATA)GetProcAddress(m_hThemeLib,
"CloseThemeData");
m_DrawThemeBackground = (PFNDRAWTHEMEBACKGROUND)GetProcAddress(m_hThemeLib,
"DrawThemeBackground");
m_DrawThemeText = (PFNDRAWTHEMETEXT)GetProcAddress(m_hThemeLib,
"DrawThemeText");
m_GetThemeBackgroundContentRect = (PFNGETTHEMEBACKGROUNDCONTENTRECT)GetProcAddress(m_hThemeLib,
"GetThemeBackgroundContentRect");
m_IsAppThemed = (PFNISAPPTHEMED)GetProcAddress(m_hThemeLib,
"IsAppThemed");
m_IsThemeActive = (PFNISTHEMEACTIVE)GetProcAddress(m_hThemeLib,
"IsThemeActive");
m_OpenThemeData = (PFNOPENTHEMEDATA)GetProcAddress(m_hThemeLib,
"OpenThemeData");
if (m_CloseThemeData &&
m_DrawThemeBackground &&
m_DrawThemeText &&
m_GetThemeBackgroundContentRect &&
m_IsAppThemed &&
m_IsThemeActive &&
m_OpenThemeData)
{
//TRACE(_T("UXTHEME.DLL loaded ok\n"));
m_bThemeLibLoaded = TRUE;
}
else
{
TRACE(_T("ERROR - failed to locate theme library function\n"));
FreeLibrary(m_hThemeLib);
m_hThemeLib = NULL;
}
}
else
{
TRACE(_T("UXTHEME.DLL not accessible\n"));
}
}
///////////////////////////////////////////////////////////////////////////////
// dtor
CXThemeHelper::~CXThemeHelper()
{
//TRACE(_T("in CXThemeHelper::~CXThemeHelper\n"));
if (m_nUseCount > 0)
m_nUseCount--;
if (m_nUseCount == 0)
{
//TRACE(_T("unloading theme dll\n"));
if (m_hThemeLib)
FreeLibrary(m_hThemeLib);
m_hThemeLib = NULL;
m_bThemeLibLoaded = FALSE;
}
//TRACE(_T("m_nUseCount=%d\n"), m_nUseCount);
}
///////////////////////////////////////////////////////////////////////////////
// CloseThemeData
BOOL CXThemeHelper::CloseThemeData(HTHEME hTheme)
{
//TRACE(_T("in CXThemeHelper::CloseThemeData\n"));
BOOL ok = FALSE;
if (m_bThemeLibLoaded && hTheme)
{
HRESULT hr = m_CloseThemeData(hTheme);
if (SUCCEEDED(hr))
ok = TRUE;
}
return ok;
}
///////////////////////////////////////////////////////////////////////////////
// DrawThemeBackground
BOOL CXThemeHelper::DrawThemeBackground(HTHEME hTheme,
HDC hdc,
int iPartId,
int iStateId,
const RECT *pRect,
const RECT *pClipRect)
{
//TRACE(_T("in CXThemeHelper::DrawThemeBackground\n"));
BOOL ok = FALSE;
if (m_bThemeLibLoaded && hTheme)
{
HRESULT hr = m_DrawThemeBackground(hTheme, hdc, iPartId, iStateId, pRect, pClipRect);
if (SUCCEEDED(hr))
ok = TRUE;
}
return ok;
}
///////////////////////////////////////////////////////////////////////////////
// DrawThemeText
BOOL CXThemeHelper::DrawThemeText(HTHEME hTheme,
HDC hdc,
int iPartId,
int iStateId,
LPCTSTR lpszText,
DWORD dwTextFlags,
DWORD dwTextFlags2,
const RECT *pRect)
{
//TRACE(_T("in CXThemeHelper::DrawThemeText\n"));
BOOL ok = FALSE;
if (m_bThemeLibLoaded && hTheme)
{
HRESULT hr = S_OK;
#ifdef _UNICODE
hr = m_DrawThemeText(hTheme, hdc, iPartId, iStateId,
lpszText, wcslen(lpszText),
dwTextFlags, dwTextFlags2, pRect);
#else
int nLen = MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, lpszText, _tcslen(lpszText)+1, NULL, 0);
nLen += 2;
WCHAR * pszWide = new WCHAR[nLen];
if (pszWide)
{
MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, lpszText, _tcslen(lpszText)+1, pszWide, nLen);
hr = m_DrawThemeText(hTheme, hdc, iPartId, iStateId,
pszWide, wcslen(pszWide),
dwTextFlags, dwTextFlags2, pRect);
delete pszWide;
}
#endif
if (SUCCEEDED(hr))
ok = TRUE;
}
return ok;
}
///////////////////////////////////////////////////////////////////////////////
// GetThemeBackgroundContentRect
BOOL CXThemeHelper::GetThemeBackgroundContentRect(HTHEME hTheme,
HDC hdc,
int iPartId,
int iStateId,
const RECT *pBoundingRect,
RECT *pContentRect)
{
//TRACE(_T("in CXThemeHelper::GetThemeBackgroundContentRect\n"));
BOOL ok = FALSE;
if (m_bThemeLibLoaded && hTheme)
{
HRESULT hr = m_GetThemeBackgroundContentRect(hTheme, hdc, iPartId,
iStateId, pBoundingRect, pContentRect);
if (SUCCEEDED(hr))
ok = TRUE;
}
return ok;
}
///////////////////////////////////////////////////////////////////////////////
// IsAppThemed
BOOL CXThemeHelper::IsAppThemed()
{
BOOL ok = FALSE;
if (m_bThemeLibLoaded)
{
ok = m_IsAppThemed();
}
return ok;
}
///////////////////////////////////////////////////////////////////////////////
// IsThemeActive
BOOL CXThemeHelper::IsThemeActive()
{
BOOL ok = FALSE;
if (m_bThemeLibLoaded)
{
ok = m_IsThemeActive();
}
return ok;
}
///////////////////////////////////////////////////////////////////////////////
// OpenThemeData
HTHEME CXThemeHelper::OpenThemeData(HWND hWnd, LPCTSTR lpszClassList)
{
//TRACE(_T("in CXThemeHelper::OpenThemeData\n"));
HTHEME hTheme = NULL;
if (m_bThemeLibLoaded)
{
#ifdef _UNICODE
hTheme = m_OpenThemeData(hWnd, lpszClassList);
#else
int nLen = MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, lpszClassList,
_tcslen(lpszClassList)+1, NULL, 0);
nLen += 2;
WCHAR * pszWide = new WCHAR [nLen];
if (pszWide)
{
MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, lpszClassList,
_tcslen(lpszClassList)+1, pszWide, nLen);
hTheme = m_OpenThemeData(hWnd, pszWide);
delete pszWide;
}
#endif
}
//TRACE(_T("m_hTheme=%X\n"), hTheme);
return hTheme;
}
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