uxtheme.h

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    int iPartId, int iStateId, OUT TEXTMETRIC* ptm);

//-------------------------------------------------------------------------
//  GetThemeBackgroundRegion()
//                      - computes the region for a regular or partially
//                        transparent theme-specified background that is
//                        bound by the specified "pRect".
//                        If the rectangle is empty, sets the HRGN to NULL
//                        and return S_FALSE.
//
//  hTheme              - theme data handle
//  hdc                 - optional HDC to draw into (DPI scaling)
//  iPartId             - part number to draw
//  iStateId            - state number (of the part)
//  pRect               - the RECT used to draw the part
//  pRegion             - receives handle to calculated region
//-------------------------------------------------------------------------
THEMEAPI GetThemeBackgroundRegion(::HTHEME hTheme, OPTIONAL HDC hdc,
    int iPartId, int iStateId, const RECT *pRect, OUT HRGN *pRegion);

//-------------------------------------------------------------------------
//----- HitTestThemeBackground, HitTestThemeBackgroundRegion flags ----

//  Theme background segment hit test flag (default). possible return values are:
//  HTCLIENT: hit test succeeded in the middle background segment
//  HTTOP, HTLEFT, HTTOPLEFT, etc:  // hit test succeeded in the the respective theme background segment.
static const int HTTB_BACKGROUNDSEG          = 0x0000  ;

//  Fixed border hit test option.  possible return values are:
//  HTCLIENT: hit test succeeded in the middle background segment
//  HTBORDER: hit test succeeded in any other background segment
static const int HTTB_FIXEDBORDER            =0x0002;  // Return code may be either HTCLIENT or HTBORDER.

//  Caption hit test option.  Possible return values are:
//  HTCAPTION: hit test succeeded in the top, top left, or top right background segments
//  HTNOWHERE or another return code, depending on absence or presence of accompanying flags, resp.
static const int HTTB_CAPTION                = 0x0004  ;

//  Resizing border hit test flags.  Possible return values are:
//  HTCLIENT: hit test succeeded in middle background segment
//  HTTOP, HTTOPLEFT, HTLEFT, HTRIGHT, etc:    hit test succeeded in the respective system resizing zone
//  HTBORDER: hit test failed in middle segment and resizing zones, but succeeded in a background border segment
static const int HTTB_RESIZINGBORDER_LEFT     = 0x0010;  // Hit test left resizing border,
static const int HTTB_RESIZINGBORDER_TOP      = 0x0020;  // Hit test top resizing border
static const int HTTB_RESIZINGBORDER_RIGHT    = 0x0040;  // Hit test right resizing border
static const int HTTB_RESIZINGBORDER_BOTTOM   = 0x0080;  // Hit test bottom resizing border

static const int HTTB_RESIZINGBORDER=         (::HTTB_RESIZINGBORDER_LEFT|::HTTB_RESIZINGBORDER_TOP| ::HTTB_RESIZINGBORDER_RIGHT|::HTTB_RESIZINGBORDER_BOTTOM);

// Resizing border is specified as a template, not just window edges.
// This option is mutually exclusive with HTTB_SYSTEMSIZINGWIDTH; HTTB_SIZINGTEMPLATE takes precedence
static const int HTTB_SIZINGTEMPLATE      = 0x0100;

// Use system resizing border width rather than theme content margins.
// This option is mutually exclusive with HTTB_SIZINGTEMPLATE, which takes precedence.
static const int HTTB_SYSTEMSIZINGMARGINS  = 0x0200;

//-------------------------------------------------------------------------
//  HitTestThemeBackground()
//                      - returns a HitTestCode (a subset of the values
//                        returned by WM_NCHITTEST) for the point "ptTest"
//                        within the theme-specified background
//                        (bound by pRect).  "pRect" and "ptTest" should
//                        both be in the same coordinate system
//                        (client, screen, etc).
//
//      hTheme          - theme data handle
//      hdc             - HDC to draw into
//      iPartId         - part number to test against
//      iStateId        - state number (of the part)
//      pRect           - the RECT used to draw the part
//      hrgn            - optional region to use; must be in same coordinates as
//                      -    pRect and pTest.
//      ptTest          - the hit point to be tested
//      dwOptions       - HTTB_xxx constants
//      pwHitTestCode   - receives the returned hit test code - one of:
//
//                        HTNOWHERE, HTLEFT, HTTOPLEFT, HTBOTTOMLEFT,
//                        HTRIGHT, HTTOPRIGHT, HTBOTTOMRIGHT,
//                        HTTOP, HTBOTTOM, HTCLIENT
//-------------------------------------------------------------------------
THEMEAPI HitTestThemeBackground(::HTHEME hTheme, OPTIONAL HDC hdc, int iPartId,
    int iStateId, DWORD dwOptions, const RECT *pRect, OPTIONAL HRGN hrgn,
    POINT ptTest, OUT WORD *pwHitTestCode);

//------------------------------------------------------------------------
//  DrawThemeEdge()     - Similar to the DrawEdge() API, but uses part colors
//                        and is high-DPI aware
//  hTheme              - theme data handle
//  hdc                 - HDC to draw into
//  iPartId             - part number to draw
//  iStateId            - state number of part
//  pDestRect           - the RECT used to draw the line(s)
//  uEdge               - Same as DrawEdge() API
//  uFlags              - Same as DrawEdge() API
//  pContentRect        - Receives the interior rect if (uFlags & BF_ADJUST)
//------------------------------------------------------------------------
THEMEAPI DrawThemeEdge(::HTHEME hTheme, HDC hdc, int iPartId, int iStateId,
                       const RECT *pDestRect, UINT uEdge, UINT uFlags, OPTIONAL OUT RECT *pContentRect);

//------------------------------------------------------------------------
//  DrawThemeIcon()     - draws an image within an imagelist based on
//                        a (possible) theme-defined effect.
//
//  hTheme              - theme data handle
//  hdc                 - HDC to draw into
//  iPartId             - part number to draw
//  iStateId            - state number of part
//  pRect               - the RECT to draw the image within
//  himl                - handle to IMAGELIST
//  iImageIndex         - index into IMAGELIST (which icon to draw)
//------------------------------------------------------------------------
THEMEAPI DrawThemeIcon(::HTHEME hTheme, HDC hdc, int iPartId,
    int iStateId, const RECT *pRect, HIMAGELIST himl, int iImageIndex);

//---------------------------------------------------------------------------
//  IsThemePartDefined() - returns TRUE if the theme has defined parameters
//                         for the specified "iPartId" and "iStateId".
//
//  hTheme              - theme data handle
//  iPartId             - part number to find definition for
//  iStateId            - state number of part
//---------------------------------------------------------------------------
THEMEAPI_(BOOL) IsThemePartDefined(::HTHEME hTheme, int iPartId,
    int iStateId);

//---------------------------------------------------------------------------
//  IsThemeBackgroundPartiallyTransparent()
//                      - returns TRUE if the theme specified background for
//                        the part/state has transparent pieces or
//                        alpha-blended pieces.
//
//  hTheme              - theme data handle
//  iPartId             - part number
//  iStateId            - state number of part
//---------------------------------------------------------------------------
THEMEAPI_(BOOL) IsThemeBackgroundPartiallyTransparent(::HTHEME hTheme,
    int iPartId, int iStateId);

//---------------------------------------------------------------------------
//    lower-level theme information services
//---------------------------------------------------------------------------
// The following methods are getter routines for each of the Theme Data types.
// Controls/Windows are defined in drawable "parts" by their author: a
// parent part and 0 or more child parts.  Each of the parts can be
// described in "states" (ex: disabled, hot, pressed).
//---------------------------------------------------------------------------
// Each of the below methods takes a "iPartId" param to specify the
// part and a "iStateId" to specify the state of the part.
// "iStateId=0" refers to the root part.  "iPartId" = "0" refers to
// the root class.
//-----------------------------------------------------------------------
// Each method also take a "iPropId" param because multiple instances of
// the same primitive type can be defined in the theme schema.
//-----------------------------------------------------------------------


//-----------------------------------------------------------------------
//  GetThemeColor()     - Get the value for the specified COLOR property
//
//  hTheme              - theme data handle
//  iPartId             - part number
//  iStateId            - state number of part
//  iPropId             - the property number to get the value for
//  pColor              - receives the value of the property
//-----------------------------------------------------------------------
THEMEAPI GetThemeColor(::HTHEME hTheme, int iPartId,
    int iStateId, int iPropId, OUT COLORREF *pColor);

//-----------------------------------------------------------------------
//  GetThemeMetric()    - Get the value for the specified metric/size
//                        property
//
//  hTheme              - theme data handle
//  hdc                 - (optional) hdc to be drawn into (DPI scaling)
//  iPartId             - part number
//  iStateId            - state number of part
//  iPropId             - the property number to get the value for
//  piVal               - receives the value of the property
//-----------------------------------------------------------------------
THEMEAPI GetThemeMetric(::HTHEME hTheme, OPTIONAL HDC hdc, int iPartId,
    int iStateId, int iPropId, OUT int *piVal);

//-----------------------------------------------------------------------
//  GetThemeString()    - Get the value for the specified string property
//
//  hTheme              - theme data handle
//  iPartId             - part number
//  iStateId            - state number of part
//  iPropId             - the property number to get the value for
//  pszBuff             - receives the string property value
//  cchMaxBuffChars     - max. number of chars allowed in pszBuff
//-----------------------------------------------------------------------
THEMEAPI GetThemeString(::HTHEME hTheme, int iPartId,
    int iStateId, int iPropId, OUT LPWSTR pszBuff, int cchMaxBuffChars);

//-----------------------------------------------------------------------
//  GetThemeBool()      - Get the value for the specified BOOL property
//
//  hTheme              - theme data handle
//  iPartId             - part number
//  iStateId            - state number of part
//  iPropId             - the property number to get the value for
//  pfVal               - receives the value of the property
//-----------------------------------------------------------------------
THEMEAPI GetThemeBool(::HTHEME hTheme, int iPartId,
    int iStateId, int iPropId, OUT BOOL *pfVal);

//-----------------------------------------------------------------------
//  GetThemeInt()       - Get the value for the specified int property
//
//  hTheme              - theme data handle
//  iPartId             - part number
//  iStateId            - state number of part
//  iPropId             - the property number to get the value for
//  piVal               - receives the value of the property
//-----------------------------------------------------------------------
THEMEAPI GetThemeInt(::HTHEME hTheme, int iPartId,
    int iStateId, int iPropId, OUT int *piVal);

//-----------------------------------------------------------------------