uxtheme.pas

Last change: 2008-02-03 This is the source code of KCeasy。

{******************************************************************************}
{                                                                              }
{ Visual Styles (Themes) API interface Unit for Object Pascal                  }
{                                                                              }
{ Portions created by Microsoft are Copyright (C) 1995-2001 Microsoft          }
{ Corporation. All Rights Reserved.                                            }
{                                                                              }
{ The original file is: uxtheme.h, released June 2001. The original Pascal     }
{ code is: UxTheme.pas, released July 2001. The initial developer of the       }
{ Pascal code is Marcel van Brakel ([e-mail]).                        }
{                                                                              }
{ Portions created by Marcel van Brakel are Copyright (C) 1999-2001            }
{ Marcel van Brakel. All Rights Reserved.                                      }
{                                                                              }
{ Portions created by Mike Lischke are Copyright (C) 1999-2002                 }
{ Mike Lischke. All Rights Reserved.                                           }
{                                                                              }
{ Obtained through: Joint Endeavour of Delphi Innovators (Project JEDI)        }
{                                                                              }
{ You may retrieve the latest version of this file at the Project JEDI home    }
{ page, located at http://delphi-jedi.org or my personal homepage located at   }
{ http://members.chello.nl/m.vanbrakel2                                        }
{                                                                              }
{ The contents of this file are used with permission, subject to the Mozilla   }
{ Public License Version 1.1 (the "License"); you may not use this file except }
{ in compliance with the License. You may obtain a copy of the License at      }
{ http://www.mozilla.org/MPL/MPL-1.1.html                                      }
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{ Software distributed under the License is distributed on an "AS IS" basis,   }
{ WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for }
{ the specific language governing rights and limitations under the License.    }
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{ GNU Lesser General Public License (the  "LGPL License"), in which case the   }
{ provisions of the LGPL License are applicable instead of those above.        }
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{ under the MPL, indicate your decision by deleting  the provisions above and  }
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{ License.  If you do not delete the provisions above, a recipient may use     }
{ your version of this file under either the MPL or the LGPL License.          }
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{******************************************************************************}

unit UxTheme;

{$HPPEMIT ''}
{$HPPEMIT '#include "uxtheme.h"'}
{$HPPEMIT ''}

interface

uses
  Windows;

procedure FreeThemeLibrary;
function InitThemeLibrary: Boolean;
function UseThemes: Boolean;

const
  WM_THEMECHANGED = $031A;
  
type
  HIMAGELIST = THANDLE; // TODO TEMPORARY
  HTHEME = THANDLE;     // handle to a section of theme data for class
  {$EXTERNALSYM HTHEME}

//----------------------------------------------------------------------------------------------------------------------
// NOTE: PartId's and StateId's used in the theme API are defined in the
//       hdr file <tmschema.h> using the TM_PART and TM_STATE macros.  For
//       example, "TM_PART(BP, PUSHBUTTON)" defines the PartId "BP_PUSHBUTTON".
//----------------------------------------------------------------------------------------------------------------------
//  OpenThemeData()     - Open the theme data for the specified HWND and
//                        semi-colon separated list of class names.
//
//                        OpenThemeData() will try each class name, one at
//                        a time, and use the first matching theme info
//                        found.  If a match is found, a theme handle
//                        to the data is returned.  If no match is found,
//                        a "NULL" handle is returned.
//
//                        When the window is destroyed or a WM_THEMECHANGED
//                        msg is received, "CloseThemeData()" should be
//                        called to close the theme handle.
//
//  hwnd                - window handle of the control/window to be themed
//
//  pszClassList        - class name (or list of names) to match to theme data
//                        section.  if the list contains more than one name,
//                        the names are tested one at a time for a match.
//                        If a match is found, OpenThemeData() returns a
//                        theme handle associated with the matching class.
//                        This param is a list (instead of just a single
//                        class name) to provide the class an opportunity
//                        to get the "best" match between the class and
//                        the current theme.  For example, a button might
//                        pass L"OkButton, Button" if its ID=ID_OK.  If
//                        the current theme has an entry for OkButton,
//                        that will be used.  Otherwise, we fall back on
//                        the normal Button entry.
//----------------------------------------------------------------------------------------------------------------------

var
  OpenThemeData: function(hwnd: HWND; pszClassList: LPCWSTR): HTHEME; stdcall;
{$EXTERNALSYM OpenThemeData}

//----------------------------------------------------------------------------------------------------------------------
//  CloseTHemeData()    - closes the theme data handle.  This should be done
//                        when the window being themed is destroyed or
//                        whenever a WM_THEMECHANGED msg is received
//                        (followed by an attempt to create a new Theme data
//                        handle).
//
//  hTheme              - open theme data handle (returned from prior call
//                        to OpenThemeData() API).
//----------------------------------------------------------------------------------------------------------------------

var
  CloseThemeData: function(hTheme: HTHEME): HRESULT; stdcall;
{$EXTERNALSYM CloseThemeData}

//----------------------------------------------------------------------------------------------------------------------
//    functions for basic drawing support
//----------------------------------------------------------------------------------------------------------------------
// The following methods are the theme-aware drawing services.
// 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).
//----------------------------------------------------------------------------------------------------------------------
// For the list of all themed classes and the definition of all
// parts and states, see the file "tmschmea.h".
//----------------------------------------------------------------------------------------------------------------------
// 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.
//----------------------------------------------------------------------------------------------------------------------
// Note: draw operations are always scaled to fit (and not to exceed)
// the specified "Rect".
//----------------------------------------------------------------------------------------------------------------------

//----------------------------------------------------------------------------------------------------------------------
//  DrawThemeBackground()
//                      - draws the theme-specified border and fill for
//                        the "iPartId" and "iStateId".  This could be
//                        based on a bitmap file, a border and fill, or
//                        other image description.
//
//  hTheme              - theme data handle
//  hdc                 - HDC to draw into
//  iPartId             - part number to draw
//  iStateId            - state number (of the part) to draw
//  pRect               - defines the size/location of the part
//  pClipRect           - optional clipping rect (don't draw outside it)
//----------------------------------------------------------------------------------------------------------------------

var
  DrawThemeBackground: function(hTheme: HTHEME; hdc: HDC; iPartId, iStateId: Integer; const pRect: TRect;
    pClipRect: PRECT): HRESULT; stdcall;
{$EXTERNALSYM DrawThemeBackground}

//----------------------------------------------------------------------------------------------------------------------
//----- DrawThemeText() flags ----

const
  DTT_GRAYED = $1;         // draw a grayed-out string
  {$EXTERNALSYM DTT_GRAYED}

//----------------------------------------------------------------------------------------------------------------------
//  DrawThemeText()     - draws the text using the theme-specified
//                        color and font for the "iPartId" and
//                        "iStateId".
//
//  hTheme              - theme data handle
//  hdc                 - HDC to draw into
//  iPartId             - part number to draw
//  iStateId            - state number (of the part) to draw
//  pszText             - actual text to draw
//  dwCharCount         - number of chars to draw (-1 for all)
//  dwTextFlags         - same as DrawText() "uFormat" param
//  dwTextFlags2        - additional drawing options
//  pRect               - defines the size/location of the part
//----------------------------------------------------------------------------------------------------------------------

var
  DrawThemeText: function(hTheme: HTHEME; hdc: HDC; iPartId, iStateId: Integer; pszText: LPCWSTR; iCharCount: Integer;
    dwTextFlags, dwTextFlags2: DWORD; const pRect: TRect): HRESULT; stdcall;
{$EXTERNALSYM DrawThemeText}

//----------------------------------------------------------------------------------------------------------------------
//  GetThemeBackgroundContentRect()
//                      - gets the size of the content for the theme-defined
//                        background.  This is usually the area inside
//                        the borders or Margins.
//
//      hTheme          - theme data handle
//      hdc             - (optional) device content to be used for drawing
//      iPartId         - part number to draw
//      iStateId        - state number (of the part) to draw
//      pBoundingRect   - the outer RECT of the part being drawn
//      pContentRect    - RECT to receive the content area
//----------------------------------------------------------------------------------------------------------------------

var
  GetThemeBackgroundContentRect: function(hTheme: HTHEME; hdc: HDC; iPartId, iStateId: Integer;
    const pBoundingRect: TRect; pContentRect: PRECT): HRESULT; stdcall;
{$EXTERNALSYM GetThemeBackgroundContentRect}

//----------------------------------------------------------------------------------------------------------------------
//  GetThemeBackgroundExtent() - calculates the size/location of the theme-
//                               specified background based on the
//                               "pContentRect".
//
//      hTheme          - theme data handle
//      hdc             - (optional) device content to be used for drawing
//      iPartId         - part number to draw
//      iStateId        - state number (of the part) to draw
//      pContentRect    - RECT that defines the content area
//      pBoundingRect   - RECT to receive the overall size/location of part
//----------------------------------------------------------------------------------------------------------------------

var
  GetThemeBackgroundExtent: function(hTheme: HTHEME; hdc: HDC; iPartId, iStateId: Integer; const pContentRect: TRect;
    var pExtentRect: TRect): HRESULT; stdcall;
{$EXTERNALSYM GetThemeBackgroundExtent}

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

type
  THEMESIZE = (
    TS_MIN,             // minimum size
    TS_TRUE,            // size without stretching
    TS_DRAW             // size that theme mgr will use to draw part
  );
  {$EXTERNALSYM THEMESIZE}
  TThemeSize = THEMESIZE;

//----------------------------------------------------------------------------------------------------------------------
//  GetThemePartSize() - returns the specified size of the theme part
//
//  hTheme              - theme data handle
//  hdc                 - HDC to select font into & measure against
//  iPartId             - part number to retrieve size for
//  iStateId            - state number (of the part)
//  prc                 - (optional) rect for part drawing destination
//  eSize               - the type of size to be retreived
//  psz                 - receives the specified size of the part
//----------------------------------------------------------------------------------------------------------------------

var
  GetThemePartSize: function(hTheme: HTHEME; hdc: HDC; iPartId, iStateId: Integer; prc: PRECT; eSize: THEMESIZE;