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TOM.pas
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TOM.pas
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// Delphi interface unit for the windowless rich-edit control
// http://msdn.microsoft.com/library/en-us/shellcc/platform/commctls/richedit/windowlessricheditcontrols.asp
// Copyright © 2003-2006 Rob Kennedy. Some rights reserved.
// For license information, see http://www.cs.wisc.edu/~rkennedy/license
// This code was written using Delphi 5. It should not require any special
// features missing from previous versions, though, except for the obvious
// COM interface support. It should also work with later Delphi versions.
unit TOM;
interface
uses Windows, ActiveX, RichEdit, IMM;
const
// These GUIDs come from the following newsgroup message.
// Re: ITextServices (Microsoft Text Object Model)
// comp.os.ms-windows.programmer.controls, comp.os.ms-windows.programmer.ole, comp.os.ms-windows.programmer.win32
// Frederic Marchal ([email protected])
// 2003-01-19 07:28:50 PST
// http://groups.google.com/groups?selm=92gl2vcsn6ie92e71228cr2jkpvap9t6g6%404ax.com
SID_ITextHost = '{c5bdd8d0-d26e-11ce-a89e-00aa006cadc5}';
SID_ITextServices = '{8d33f740-cf58-11ce-a89d-00aa006cadc5}';
{ SID_ITextDocument = '8CC497C0-A1DF-11CE-8098-00AA0047BE5D';
SID_ITextRange = '8CC497C2-A1DF-11CE-8098-00AA0047BE5D';
SID_ITextFont = '8CC497C3-A1DF-11CE-8098-00AA0047BE5D';
SID_ITextPara = '8CC497C4-A1DF-11CE-8098-00AA0047BE5D';
SID_ITextStoryRanges = '8CC497C5-A1DF-11CE-8098-00AA0047BE5D';}
IID_ITextHost: TGUID = SID_ITextHost;
IID_ITextServices: TGUID = SID_ITextServices;
{ IID_ITextDocument: TGUID = SID_ITextDocument;
IID_ITextRange: TGUID = SID_ITextRange;
IID_ITextFont: TGUID = SID_ITextFont;
IID_ITextPara: TGUID = SID_ITextPara;
IID_ITextStoryRanges: TGUID = SID_ITextStoryRanges;}
// The following declarations are based on the contents of the TextServ.h
// Windows SDK header file as of 26 March 2003.
type
// These pointer types are missing from Borland's declarations.
PCharFormat = ^TCharFormat;
PCharFormatA = ^TCharFormatA;
PCharFormatW = ^TCharFormatW;
PParaFormat = ^TParaFormat;
TSizeL = TSize;
TRectL = TRect;
// For the en_RequestResize notification message
PReqResize = ^TReqResize;
TReqResize = packed record
nmhdr: TNMHdr;
rc: TRect;
end;
const
txtBit_RichText = 1;
txtBit_Multiline = 2;
txtBit_ReadOnly = 4;
txtBit_ShowAccelerator = 8;
txtBit_UsePassword = $10;
txtBit_HideSelection = $20;
txtBit_SaveSelection = $40;
txtBit_AutoWordSel = $80;
txtBit_Vertical = $100;
txtBit_SelBarChange = $200;
txtBit_WordWrap = $400;
txtBit_AllowBeep = $800;
txtBit_DisableDrag = $1000;
txtBit_ViewInsetChange = $2000;
txtBit_BackStyleChange = $4000;
txtBit_MaxLengthChange = $8000;
txtBit_ScrollBarChange = $10000;
txtBit_CharFormatChange = $20000;
txtBit_ParaFormatChange = $40000;
txtBit_ExtentChange = $80000;
txtBit_ClientRectChange = $100000;
txtBit_UseCurrentBkg = $200000;
txtNS_FitToContent = 1;
txtNS_RoundToLine = 2;
type
{$MINENUMSIZE 4}
TTxtBackStyle = (txtBack_Transparent, txtBack_Opaque);
TTxtView = (txtView_Active, txtView_Inactive);
TTxDrawCallback = function(param: DWord): Bool; stdcall;
ITextServices = interface
[SID_ITextServices]
function TxSendMessage(msg: UInt; wParam: wParam; lParam: lParam; out plresult: lResult): HResult; stdcall;
function TxDraw(dwDrawAspect: DWord; lindex: LongInt; pvAspect: Pointer; ptd: PDVTargetDevice; hdcDraw, hicTargetDev: HDC; const lprcBounds, lprcWBounds: TRectL; const lprcUpdate: TRect; pfnContinue: TTxDrawCallback; dwContinue: DWord; lViewID: TTxtView): HResult; stdcall;
function TxGetHScroll(out plMin, plMax, plPos, plPage: LongInt; out pfEnabled: Bool): HResult; stdcall;
function TxGetVScroll(out plMin, plMax, plPos, plPage: LongInt; out pfEnabled: Bool): HResult; stdcall;
function OnTxSetCursor(dwDrawAspect: DWord; lindex: LongInt; pvAspect: Pointer; ptd: PDVTargetDevice; hdcDraw, hicTargetDev: HDC; const lprcClient: TRect; x, y: Integer): HResult; stdcall;
function TxQueryHitPoint(dwDrawAspect: DWord; lindex: LongInt; pvAspect: Pointer; ptd: PDVTargetDevice; hdcDraw, hicTargetDev: HDC; const lprcClient: TRect; x, y: Integer; out pHitResult: DWord): HResult; stdcall;
function OnTxInPlaceActivate(const prcClient: TRect): HResult; stdcall;
function OnTxInPlaceDeactivate: HResult; stdcall;
function OnTxUIActivate: HResult; stdcall;
function OnTxUIDeactivate: HResult; stdcall;
function TxGetText(out pbstrText: TBStr): HResult; stdcall;
function TxSetText(pszText: PWideChar): HResult; stdcall;
function TxGetCurTargetX(out px: LongInt): HResult; stdcall;
function TxGetBaselinePos(out pBaselinePos: LongInt): HResult; stdcall;
function TxGetNaturalSize(dwAspect: DWord; hdcDraw, hicTargetDev: HDC; ptd: PDVTargetDevice; dwMode: DWord; const psizelExtent: TSizeL; var pwidth, pheight: LongInt): HResult; stdcall;
function TxGetDropTarget(out ppDropTarget: IDropTarget): HResult; stdcall;
function OnTxPropertyBitsChange(dwMask, dwBits: DWord): HResult; stdcall;
function TxGetCachedSize(out pdwWidth, pdwHeight: DWord): HResult; stdcall;
end;
ITextHost = interface
[SID_ITextHost]
function TxGetDC: HDC; stdcall;
function TxReleaseDC(hdc: HDC): Integer; stdcall;
function TxShowScrollBar(fnBar: Integer; fShow: Bool): Bool; stdcall;
function TxEnableScrollBar(fuSBFlags, fuArrowFlags: Integer): Bool; stdcall;
function TxSetScrollRange(fnBar: Integer; nMinPos: LongInt; nMaxPos: Integer; fRedraw: Bool): Bool; stdcall;
function TxSetScrollPos(fnBar, nPos: Integer; fRedraw: Bool): Bool; stdcall;
procedure TxInvalidateRect(const prc: TRect; fMode: Bool); stdcall;
procedure TxViewChange(fUpdate: Bool); stdcall;
function TxCreateCaret(hbmp: hBitmap; xWidth, yHeight: Integer): Bool; stdcall;
function TxShowCaret(fShow: Bool): Bool; stdcall;
function TxSetCaretPos(x, y: Integer): Bool; stdcall;
function TxSetTimer(idTimer, uTimeout: UInt): Bool; stdcall;
procedure TxKillTimer(idTimer: UInt); stdcall;
procedure TxScrollWindowEx(dx, dy: Integer; const lprcScroll, lprcClip: TRect; hrgnUpdate: HRgn; fuScroll: UInt); stdcall;
procedure TxSetCapture(fCapture: Bool); stdcall;
procedure TxSetFocus; stdcall;
procedure TxSetCursor(hcur: hCursor; fText: Bool); stdcall;
function TxScreenToClient(var lppt: TPoint): Bool; stdcall;
function TxClientToScreen(var lppt: TPoint): Bool; stdcall;
function TxActivate(out lpOldState: LongInt): HResult; stdcall;
function TxDeactivate(lNewState: LongInt): HResult; stdcall;
function TxGetClientRect(out prc: TRect): HResult; stdcall;
function TxGetViewInset(out prc: TRect): HResult; stdcall;
function TxGetCharFormat(out ppCF: PCharFormatW): HResult; stdcall;
function TxGetParaFormat(out ppPF: PParaFormat): HResult; stdcall;
function TxGetSysColor(nIndex: Integer): TColorRef; stdcall;
function TxGetBackStyle(out pstyle: TTxtBackStyle): HResult; stdcall;
function TxGetMaxLength(out pLength: DWord): HResult; stdcall;
function TxGetScrollBars(out pdwScrollBar: DWord): HResult; stdcall;
function TxGetPasswordChar(out pch: {Wide}Char): HResult; stdcall;
function TxGetAcceleratorPos(out pcp: LongInt): HResult; stdcall;
function TxGetExtent(out lpExtent: TSizeL): HResult; stdcall;
function OnTxCharFormatChange(const pcf: TCharFormatW): HResult; stdcall;
function OnTxParaFormatChange(const ppf: TParaFormat): HResult; stdcall;
function TxGetPropertyBits(dwMask: DWord; out pdwBits: DWord): HResult; stdcall;
function TxNotify(iNotify: DWord; pv: Pointer): HResult; stdcall;
function TxImmGetContext: hIMC; stdcall;
procedure TxImmReleaseContext(himc: hIMC); stdcall;
function TxGetSelectionBarWidth(out lSelBarWidth: LongInt): HResult; stdcall;
end;
{ Text Font interface }
{ ITextFont = interface
[SID_ITextFont]
function CanChange( out pbCanChange : LongInt ): HResult; stdcall;
function GetAllCaps( out pValue : LongInt ): HResult; stdcall;
function GetAnimation( out pValue : LongInt ): HResult; stdcall;
function GetBackColor( out pValue : LongInt ): HResult; stdcall;
function GetBold( out pValue : LongInt ): HResult; stdcall;
function GetDuplicate( out ppFont : ITextFont ): HResult; stdcall;
function GetEmboss( out pValue : LongInt ): HResult; stdcall;
function GetEngrave( out pValue : LongInt ): HResult; stdcall;
function GetForeColor( out pValue : LongInt ): HResult; stdcall;
function GetHidden( out pValue : LongInt ): HResult; stdcall;
function GetItalic( out pValue : LongInt ): HResult; stdcall;
function GetKerning( out pValue : Real ): HResult; stdcall;
function GetLanguageID( out pValue : LongInt ): HResult; stdcall;
function GetName( out pbstr : TBStr ): HResult; stdcall;
function GetOutline( out pValue : LongInt ): HResult; stdcall;
function GetPosition( out pValue : Real ): HResult; stdcall;
function GetProtected( out pValue : LongInt ): HResult; stdcall;
function GetShadow( out pValue : LongInt ): HResult; stdcall;
function GetSize( out pValue : Real ): HResult; stdcall;
function GetSmallCaps( out pValue : LongInt ): HResult; stdcall;
function GetSpacing( out pValue : Real ): HResult; stdcall;
function GetStrikeThrough( out pValue : LongInt ): HResult; stdcall;
function GetStyle( out pValue : LongInt ): HResult; stdcall;
function GetSubscript( out pValue : LongInt ): HResult; stdcall;
function GetSuperscript( out pValue : LongInt ): HResult; stdcall;
function GetUnderline( out pValue : LongInt ): HResult; stdcall;
function GetWeight( out pValue : LongInt ): HResult; stdcall;
function IsEqual( pFont : ITextFont; out pB : LongInt ): HResult; stdcall;
function Reset( lValue : LongInt ): HResult; stdcall;
function SetAllCaps( lValue : LongInt ): HResult; stdcall;
function SetAnimation( lValue : LongInt ): HResult; stdcall;
function SetBackColor( lValue : LongInt ): HResult; stdcall;
function SetBold( lValue : LongInt ): HResult; stdcall;
function SetDuplicate( pFont : ITextFont ): HResult; stdcall;
function SetEmboss( lValue : LongInt ): HResult; stdcall;
function SetEngrave( lValue : LongInt ): HResult; stdcall;
function SetForeColor( lValue : LongInt ): HResult; stdcall;
function SetHidden( lValue : LongInt ): HResult; stdcall;
function SetItalic( lValue : LongInt ): HResult; stdcall;
function SetKerning( fValue : Real ): HResult; stdcall;
function SetLanguageID( lValue : LongInt ): HResult; stdcall;
function SetName( sName : TBStr ): HResult; stdcall;
function SetOutline( lValue : LongInt ): HResult; stdcall;
function SetPosition( fValue : Real ): HResult; stdcall;
function SetProtected( lValue : LongInt ): HResult; stdcall;
function SetShadow( lValue : LongInt ): HResult; stdcall;
function SetSize( fValue : Real ): HResult; stdcall;
function SetSmallCaps( lValue : LongInt ): HResult; stdcall;
function SetSpacing( fValue : Real ): HResult; stdcall;
function SetStrikeThrough( lValue : LongInt ): HResult; stdcall;
function SetStyle( lValue : LongInt ): HResult; stdcall;
function SetSubscript( lValue : LongInt ): HResult; stdcall;
function SetSuperscript( lValue : LongInt ): HResult; stdcall;
function SetUnderline( lValue : LongInt ): HResult; stdcall;
function SetWeight( lValue : LongInt ): HResult; stdcall;
end;}
{ Text Para interface }
{ ITextPara = interface
[SID_ITextPara]
function AddTab( tbPos : Real; tbAlign, tbLeader : LongInt ): HResult; stdcall;
function CanChange( out pbCanChange : LongInt ): HResult; stdcall;
function ClearAllTabs: HResult; stdcall;
function DeleteTab( tbPos : Real ): HResult; stdcall;
function GetAlignment( out pValue : LongInt ): HResult; stdcall;
function GetDuplicate( out ppPara : ITextPara ): HResult; stdcall;
function GetFirstLineIndent( out pValue : Real ): HResult; stdcall;
function GetHyphenation( out pValue : LongInt ): HResult; stdcall;
function GetKeepTogether( out pValue : LongInt ): HResult; stdcall;
function GetKeepWithNext( out pValue : LongInt ): HResult; stdcall;
function GetLeftIndent( out pValue : Real ): HResult; stdcall;
function GetLineSpacing( out pValue : Real ): HResult; stdcall;
function GetLineSpacingRule( out pValue : LongInt ): HResult; stdcall;
function GetListAlignment( out pValue : LongInt ): HResult; stdcall;
function GetListLevelIndex( out pValue : LongInt ): HResult; stdcall;
function GetListStart( out pValue : LongInt ): HResult; stdcall;
function GetListTab( out pValue : Real ): HResult; stdcall;
function GetListType( out pValue : LongInt ): HResult; stdcall;
function GetNoLineNumber( out pValue : LongInt ): HResult; stdcall;
function GetPageBreakBefore( out pValue : LongInt ): HResult; stdcall;
function GetRightIndent( out pValue : Real ): HResult; stdcall;
function GetSpaceAfter( out pValue : Real ): HResult; stdcall;
function GetSpaceBefore( out pValue : Real ): HResult; stdcall;
function GetStyle( out pValue : LongInt ): HResult; stdcall;
function GetTab( iTab : LongInt; out ptbPos : Real; out ptbAlign : LongInt; out ptbLeader : LongInt ): HResult; stdcall;
function GetTabCount( out pc : LongInt ): HResult; stdcall;
function GetWidowControl( out pBool : LongInt ): HResult; stdcall;
function IsEqual( pPara : ITextPara; out pBout : LongInt ): HResult; stdcall;
function Reset( lValue : LongInt ): HResult; stdcall;
function SetAlignment( lValue : LongInt ): HResult; stdcall;
function SetDuplicate( pPara : ITextPara ): HResult; stdcall;
function SetHyphenation( lValue : LongInt ): HResult; stdcall;
function SetIndents( fFirst, fLeft, fRight : Real ): HResult; stdcall;
function SetKeepTogether( lValue : LongInt ): HResult; stdcall;
function SetKeepWithNext( lValue : LongInt ): HResult; stdcall;
function SetLineSpacing( lRule : LongInt; fSpacing : Real ): HResult; stdcall;
function SetListAlignment( lValue : LongInt ): HResult; stdcall;
function SetListLevelIndex( lValue : LongInt ): HResult; stdcall;
function SetListStart( lValue : LongInt ): HResult; stdcall;
function SetListTab( fValue : Real ): HResult; stdcall;
function SetListType( lValue : LongInt ): HResult; stdcall;
function SetNoLineNumber( lValue : LongInt ): HResult; stdcall;
function SetPageBreakBefore( lValue : LongInt ): HResult; stdcall;
function SetRightIndent( fValue : Real ): HResult; stdcall;
function SetSpaceAfter( fValue : Real ): HResult; stdcall;
function SetSpaceBefore( fValue : Real ): HResult; stdcall;
function SetStyle( lValue : LongInt ): HResult; stdcall;
function SetWidowControl( lValue : LongInt ): HResult; stdcall;
end; }
{ Text Range interface }
{ ITextRange = interface
[SID_ITextRange]
function CanEdit( out pbCanEdit : LongInt ): HResult; stdcall;
function CanPaste( pv : Pointer; Format : LongInt; out pb : LongInt ): HResult; stdcall;
function ChangeCase( iType : LongInt ): HResult; stdcall;
function Collapse( bStart : LongInt ): HResult; stdcall;
function Copy( pv : Pointer ): HResult; stdcall;
function Cut( pv : Pointer ): HResult; stdcall;
function Delete( lUnit, lCount : LongInt; out pDelta : LongInt ): HResult; stdcall;
function EndOf( lUnit, lExtend : LongInt; out pDelta : LongInt ): HResult; stdcall;
function Expand( lUnit : LongInt; out pDelta : LongInt ): HResult; stdcall;
function FindText( bstr : TBStr; lCount, lFlags : LongInt; out pLength : LongInt ): HResult; stdcall;
function FindTextEnd( bstr : TBStr; lCount, lFlags : LongInt; out pLength : LongInt ): HResult; stdcall;
function FindTextStart( bstr : TBStr; lCount, lFlags : LongInt; out pLength : LongInt ): HResult; stdcall;
function GetChar( out pChar : LongInt ): HResult; stdcall;
function GetDuplicate( out pRange : ITextRange ): HResult; stdcall;
function GetEmbeddedObject( out ppObject : IUnknown ): HResult; stdcall;
function GetEnd( out pcpLim : LongInt ): HResult; stdcall;
function GetFont( out ppFont : ITextFont ): HResult; stdcall;
function GetFormattedText( out ppRange : ITextRange ): HResult; stdcall;
function GetIndex( lUnit : LongInt; out pIndex : LongInt ): HResult; stdcall;
function GetPara( out ppPara : ITextPara ): HResult; stdcall;
function GetPoint( lType : LongInt; out px : LongInt; out py : LongInt ): HResult; stdcall;
function GetStart( out pcpFirst : LongInt ): HResult; stdcall;
function GetStoryLength( out pCount : LongInt ): HResult; stdcall;
function GetStoryType( out pValue : LongInt ): HResult; stdcall;
function GetText( out pbstr : TBStr ): HResult; stdcall;
function InRange( out pRange : ITextRange; out pB : LongInt ): HResult; stdcall;
function InStory( out pRange : ITextRange; out pB : LongInt ): HResult; stdcall;
function IsEqual( out pRange : ITextRange; out pB : LongInt ): HResult; stdcall;
function Move( lUnit, lCount : LongInt; out pDelta : LongInt ): HResult; stdcall;
function MoveEnd( lUnit, lCount : LongInt; out pDelta : LongInt ): HResult; stdcall;
function MoveEndUntil( cSet : Pointer; lCount : LongInt; out pDelta : LongInt ): HResult; stdcall;
function MoveEndWhile( cSet : Pointer; lCount : LongInt; out pDelta : LongInt ): HResult; stdcall;
function MoveStart( lUnit, lCount : LongInt; out pDelta : LongInt ): HResult; stdcall;
function MoveStartUntil( cSet : Pointer; lCount : LongInt; out pDelta : LongInt ): HResult; stdcall;
function MoveStartWhile( cSet : Pointer; lCount : LongInt; out pDelta : LongInt ): HResult; stdcall;
function MoveUntil( cSet : Pointer; lCount : LongInt; out pDelta : LongInt ): HResult; stdcall;
function MoveWhile( cSet : Pointer; lCount : LongInt; out pDelta : LongInt ): HResult; stdcall;
function Paste( pVar : Pointer; Format : LongInt ): HResult; stdcall;
function ScrollIntoView( bStart : LongInt ): HResult; stdcall;
function Select: HResult; stdcall;
function SetChar( lChar : LongInt ): HResult; stdcall;
function SetEnd( lChar : LongInt ): HResult; stdcall;
function SetFont( pFont : ITextFont ): HResult; stdcall;
function SetFormattedText( pRange : ITextRange ): HResult; stdcall;
function SetIndex( lUnit, lIndex, lExtend : LongInt ): HResult; stdcall;
function SetPara( pPara : ITextPara ): HResult; stdcall;
function SetPoint( lX, lY, lType, lExtend : LongInt ): HResult; stdcall;
function SetRange( lCP1, lCP2 : LongInt ): HResult; stdcall;
function SetStart( cp : LongInt ): HResult; stdcall;
function SetText( bstr : TBStr ): HResult; stdcall;
function StartOf( lUnit, lExtend : LongInt; out pDelta : LongInt ): HResult; stdcall;
end; }
{ Text Story Ranges interface }
{ ITextStoryRanges = interface
[SID_ITextStoryRanges]
function _NewEnum( out ppunkEnum : IUnknown ): HResult; stdcall;
function GetCount( out pCount : LongInt ): HResult; stdcall;
function Item( lIndex : LongInt; out ppRange : ITextRange ): HResult; stdcall;
end; }
{ Text Document interface }
{ ITextDocument = interface
[SID_ITextDocument]
function BeginEditCollection: HResult; stdcall;
function EndEditCollection: HResult; stdcall;
function Freeze(out pValue : LongInt): HResult; stdcall;
function GetDefaultTabStop( out fValue : real ): HResult; stdcall;
function GetName(out pbstrText: TBStr): HResult; stdcall;
function GetSaved(out pbBool: LongInt): HResult; stdcall;
function GetSelection(out pv : Pointer): HResult; stdcall;
function GetStoryCount( out pCount : LongInt): HResult; stdcall;
function GetStoryRanges( out pStories : ITextStoryRanges ): HResult; stdcall;
function New: HResult; stdcall;
function Open( sFile : TBStr; uFlags : LongInt; uCodePage : LongInt ): HResult; stdcall;
function Range( cFirst, cLim : LongInt; out ppRange : ITextRange ): HResult; stdcall;
function RangeFromPoint( cX, cY : LongInt; out ppRange : ITextRange ): HResult; stdcall;
function Redo( cCount : LongInt; out cProp : LongInt ): HResult; stdcall;
function Save( sFile : TBStr; cFlags, cCodePage : LongInt ): HResult; stdcall;
function SetDefaultTabStop( fValue : real ): HResult; stdcall;
function SetSaved( bBool : LongInt ): HResult; stdcall;
function Undo( cCount : LongInt; out cProp : LongInt ): HResult; stdcall;
function Unfreeze( out pCount : LongInt ): HResult; stdcall;
end; }
// TTextHostImpl is a helper class for implementors of the ITextHost
// interface in Delphi. It could have been declared as an actual
// implementor of ITextHost itself, but since it has to be wrapped by
// CreateTextHost anyway, I didn't want to have to deal with reference
// counting of a helper class and forwarding calls to IUnknown's methods.
// TTextHostImpl provides default implementations for most of the
// methods. Override them in descendents. TxGetPropertyBits is an
// abstract method since I could not decide on a suitable default return
// value. The layout of this class is important. The virtual-method table
// MUST have the same layout as the ITextHost method table. To use
// TTextHostImpl with a windowless rich-edit control, create an instance
// of a descendent and pass it to CreateTextHost (declared below).
// CreateTextHost takes ownership of the TTextHostImpl object; do not
// free it.
TTextHostImpl = class
public
function TxGetDC: HDC; virtual; stdcall;
function TxReleaseDC(hdc: HDC): Integer; virtual; stdcall;
function TxShowScrollBar(fnBar: Integer; fShow: Bool): Bool; virtual; stdcall;
function TxEnableScrollBar(fuSBFlags, fuArrowFlags: Integer): Bool; virtual; stdcall;
function TxSetScrollRange(fnBar: Integer; nMinPos: LongInt; nMaxPos: Integer; fRedraw: Bool): Bool; virtual; stdcall;
function TxSetScrollPos(fnBar, nPos: Integer; fRedraw: Bool): Bool; virtual; stdcall;
procedure TxInvalidateRect(const prc: TRect; fMode: Bool); virtual; stdcall;
procedure TxViewChange(fUpdate: Bool); virtual; stdcall;
function TxCreateCaret(hbmp: hBitmap; xWidth, yHeight: Integer): Bool; virtual; stdcall;
function TxShowCaret(fShow: Bool): Bool; virtual; stdcall;
function TxSetCaretPos(x, y: Integer): Bool; virtual; stdcall;
function TxSetTimer(idTimer, uTimeout: UInt): Bool; virtual; stdcall;
procedure TxKillTimer(idTimer: UInt); virtual; stdcall;
procedure TxScrollWindowEx(dx, dy: Integer; const lprcScroll, lprcClip: TRect; hrgnUpdate: HRgn; fuScroll: UInt); virtual; stdcall;
procedure TxSetCapture(fCapture: Bool); virtual; stdcall;
procedure TxSetFocus; virtual; stdcall;
procedure TxSetCursor(hcur: hCursor; fText: Bool); virtual; stdcall;
function TxScreenToClient(var lppt: TPoint): Bool; virtual; stdcall;
function TxClientToScreen(var lppt: TPoint): Bool; virtual; stdcall;
function TxActivate(out lpOldState: LongInt): HResult; virtual; stdcall;
function TxDeactivate(lNewState: LongInt): HResult; virtual; stdcall;
function TxGetClientRect(out prc: TRect): HResult; virtual; stdcall;
function TxGetViewInset(out prc: TRect): HResult; virtual; stdcall;
function TxGetCharFormat(out ppCF: PCharFormatW): HResult; virtual; stdcall;
function TxGetParaFormat(out ppPF: PParaFormat): HResult; virtual; stdcall;
function TxGetSysColor(nIndex: Integer): TColorRef; virtual; stdcall;
function TxGetBackStyle(out pstyle: TTxtBackStyle): HResult; virtual; stdcall;
function TxGetMaxLength(out pLength: DWord): HResult; virtual; stdcall;
function TxGetScrollBars(out pdwScrollBar: DWord): HResult; virtual; stdcall;
function TxGetPasswordChar(out pch: {Wide}Char): HResult; virtual; stdcall;
function TxGetAcceleratorPos(out pcp: LongInt): HResult; virtual; stdcall;
function TxGetExtent(out lpExtent: TSizeL): HResult; virtual; stdcall;
function OnTxCharFormatChange(const pcf: TCharFormatW): HResult; virtual; stdcall;
function OnTxParaFormatChange(const ppf: TParaFormat): HResult; virtual; stdcall;
function TxGetPropertyBits(dwMask: DWord; out pdwBits: DWord): HResult; virtual; stdcall; abstract;
function TxNotify(iNotify: DWord; pv: Pointer): HResult; virtual; stdcall;
function TxImmGetContext: hIMC; virtual; stdcall;
procedure TxImmReleaseContext(himc: hIMC); virtual; stdcall;
function TxGetSelectionBarWidth(out lSelBarWidth: LongInt): HResult; virtual; stdcall;
end;
// CreateTextHost wraps a TTextHostImpl instance and returns an ITextHost
// interface reference suitable for passing to CreateTextServices.
//
// Caution: Delphi code must NEVER call any functions using the returned
// interface, except for the methods introduced in IUnknown. The actual
// ITextHost methods use the thiscall calling convention, which Delphi
// doesn't understand. If you need to call those methods, call them via
// the original TTextHostImpl reference instead.
//
// See also: TTextHostImpl
function CreateTextHost(const Impl: TTextHostImpl): ITextHost;
// This is the API function, documented by Microsoft. See MSDN for details.
function CreateTextServices(punkOuter: IUnknown; pITextHost: ITextHost; out ppUnk): HResult; stdcall;
// PatchTextServices takes an ITextServices reference, as returned by
// CreateTextServices, and wraps it within a Delphi-compatible
// ITextServices implementation.
//
// Services
// [in,out] On entry, this parameter is a reference to an ITextServices
// object returned by CreateTextServices. On exit, it is a reference to a
// new ITextServices object suitable for use in Delphi.
//
// This function is necessary because the ITextServices interface is
// written to expect the thiscall calling convention, not the usual
// stdcall. Instead of passing Self as a regular variable on the stack, it
// is passed in the ECX register. PatchTextServices creates a wrapper
// object that fixes the stack layout for each function before forwarding
// the call to the original object.
//
// See also: CreateTextServices
procedure PatchTextServices(var Services: ITextServices);
implementation
uses SysUtils;
function CreateTextServices; external 'riched20.dll';
type
TQueryInterface = function(const This: IUnknown; const riid: TGUID; out ppvObj): HResult; stdcall;
// Many of the following routines are declared without any parameters or
// return types. This is because they must use the stdcall calling
// convention, but the compiler automatically adds prologue and epilogue
// code for all stdcall functions, even if it isn't strictly necessary.
// This is OK, though, since these functions are all implemented in
// assembler and they are never called by any Delphi code. They're always
// called via an interface reference, usually by the operating system.
type
PITextServicesMT = ^TITextServicesMT;
TITextServicesMT = packed record
// IUnknown
QueryInterface: TQueryInterface;
_AddRef,
_Release: TProcedure;
// ITextServices
TxSendMessage,
TxDraw,
TxGetHScroll,
TxGetVScroll,
OnTxSetCursor,
TxQueryHitPoint,
OnTxInPlaceActivate,
OnTxInPlaceDeactivate,
OnTxUIActivate,
OnTxUIDeactivate,
TxGetText,
TxSetText,
TxGetCurTargetX,
TxGetBaselinePos,
TxGetNaturalSize,
TxGetDropTarget,
OnTxPropertyBitsChange,
TxGetCachedSize: TProcedure;
end;
PITextServices = ^TITextServices;
TITextServices = packed record
MethodTable: PITextServicesMT;
Impl: ITextServices;
end;
function TextServices_QueryInterface(const This: IUnknown; const riid: TGUID; out ppvObj): HResult; stdcall;
begin
Result := PITextServices(This).Impl.QueryInterface(riid, ppvObj);
end;
procedure TextServices_AddRef; // (const This: IUnknown): ULong; stdcall;
{begin
Result := PITextServices(This).Impl._AddRef;}
asm
mov eax, [esp + 4]
mov eax, [eax].TITextServices.Impl
mov [esp + 4], eax
mov eax, [eax]
jmp dword ptr [eax].TITextServicesMT._AddRef
end;
procedure ReleaseTextServices(const Services: PITextServices);
// This procedure is not in assembler because Dispose requires compiler
// magic in order to include TypeInfo for a PITextServices pointer.
begin
Pointer(Services.Impl) := nil;
Dispose(Services);
end;
procedure TextServices_Release; // (const This: IUnknown): ULong; stdcall;
{begin
Result := PITextServices(This).Impl._Release;
if Result = 0 then ReleaseTextServices(PTextServices(This));}
asm
mov eax, [esp + 4]
mov eax, [eax].TITextServices.Impl
push eax
mov eax, [eax]
call dword ptr [eax].TITextServicesMT._Release
test eax, eax
jnz @@exit
mov eax, [esp + 4]
call ReleaseTextServices
xor eax, eax
@@exit:
ret 4
end;
// These stubs get called as stdcall methods. They translate the stack into
// a thiscall method. First, there is a breakpoint, which can be set or
// ignored when a method is patched. Next, we pop the return address into
// EDX. Then we pop the Self parameter that Delphi puts at the top of the
// stack. It's actually a PITextServices value. The real ITextServices
// implementor is expecting to find its instance reference in ECX when we
// call it, and that got stored in the Inst field of the TITextServices
// record by the PatchTextServices function. After we set ECX, we push the
// return address back onto the stack (note the PITextServices reference is
// *not* pushed back on). ECX points to the first entry of the
// implementor's VMT, so we add an offset to that pointer and jump to the
// address stored there.
procedure TextServices_TxSendMessage; // (msg: UInt; wParam: wParam; lParam: lParam; out plresult: lResult): HResult; stdcall;
asm
pop edx // return address
pop eax
mov ecx, [eax].TITextServices.Impl
push edx // return address
mov eax, [ecx]
jmp dword ptr [eax].TITextServicesMT.TxSendMessage
end;
procedure TextServices_TxDraw; // (dwDrawAspect: DWord; lindex: LongInt; pvAspect: Pointer; ptd: PDVTargetDevice; hdcDraw, hicTargetDev: HDC; const lprcBounds, lprcWBounds: TRectL; const lprcUpdate: TRect; pfnContinue: TTxDrawCallback; dwContinue: DWord; lViewID: TTxtView): HResult; stdcall;
asm
pop edx // return address
pop eax
mov ecx, [eax].TITextServices.Impl
push edx // return address
mov eax, [ecx]
jmp dword ptr [eax].TITextServicesMT.TxDraw
end;
procedure TextServices_TxGetHScroll; // (out plMin, plMax, plPos, plPage: LongInt; out pfEnabled: Bool): HResult; stdcall;
asm
pop edx // return address
pop eax
mov ecx, [eax].TITextServices.Impl
push edx // return address
mov eax, [ecx]
jmp dword ptr [eax].TITextServicesMT.TxGetHScroll
end;
procedure TextServices_TxGetVScroll; // (out plMin, plMax, plPos, plPage: LongInt; out pfEnabled: Bool): HResult; stdcall;
asm
pop edx // return address
pop eax
mov ecx, [eax].TITextServices.Impl
push edx // return address
mov eax, [ecx]
jmp dword ptr [eax].TITextServicesMT.TxGetVScroll
end;
procedure TextServices_OnTxSetCursor; // (dwDrawAspect: DWord; lindex: LongInt; pvAspect: Pointer; ptd: PDVTargetDevice; hdcDraw, hicTargetDev: HDC; const lprcClient: TRect; x, y: Integer): HResult; stdcall;
asm
pop edx // return address
pop eax
mov ecx, [eax].TITextServices.Impl
push edx // return address
mov eax, [ecx]
jmp dword ptr [eax].TITextServicesMT.OnTxSetCursor
end;
procedure TextServices_TxQueryHitPoint; // (dwDrawAspect: DWord; lindex: LongInt; pvAspect: Pointer; ptd: PDVTargetDevice; hdcDraw, hicTargetDev: HDC; const lprcClient: TRect; x, y: Integer; out pHitResult: DWord): HResult; stdcall;
asm
pop edx // return address
pop eax
mov ecx, [eax].TITextServices.Impl
push edx // return address
mov eax, [ecx]
jmp dword ptr [eax].TITextServicesMT.TxQueryHitPoint
end;
procedure TextServices_OnTxInPlaceActivate; // (const prcClient: TRect): HResult; stdcall;
asm
pop edx // return address
pop eax
mov ecx, [eax].TITextServices.Impl
push edx // return address
mov eax, [ecx]
jmp dword ptr [eax].TITextServicesMT.OnTxInPlaceActivate
end;
procedure TextServices_OnTxInPlaceDeactivate; // : HResult; stdcall;
asm
pop edx // return address
pop eax
mov ecx, [eax].TITextServices.Impl
push edx // return address
mov eax, [ecx]
jmp dword ptr [eax].TITextServicesMT.OnTxInPlaceDeactivate
end;
procedure TextServices_OnTxUIActivate; // : HResult; stdcall;
asm
pop edx // return address
pop eax
mov ecx, [eax].TITextServices.Impl
push edx // return address
mov eax, [ecx]
jmp dword ptr [eax].TITextServicesMT.OnTxUIActivate
end;
procedure TextServices_OnTxUIDeactivate; // : HResult; stdcall;
asm
pop edx // return address
pop eax
mov ecx, [eax].TITextServices.Impl
push edx // return address
mov eax, [ecx]
jmp dword ptr [eax].TITextServicesMT.OnTxUIDeactivate
end;
procedure TextServices_TxGetText; // (out pbstrText: TBStr): HResult; stdcall;
asm
pop edx // return address
pop eax
mov ecx, [eax].TITextServices.Impl
push edx // return address
mov eax, [ecx]
jmp dword ptr [eax].TITextServicesMT.TxGetText
end;
procedure TextServices_TxSetText; // (pszText: PWideChar): HResult; stdcall;
asm
pop edx // return address
pop eax
mov ecx, [eax].TITextServices.Impl
push edx // return address
mov eax, [ecx]
jmp dword ptr [eax].TITextServicesMT.TxSetText
end;
procedure TextServices_TxGetCurTargetX; // (out px: LongInt): HResult; stdcall;
asm
pop edx // return address
pop eax
mov ecx, [eax].TITextServices.Impl
push edx // return address
mov eax, [ecx]
jmp dword ptr [eax].TITextServicesMT.TxGetCurTargetX
end;
procedure TextServices_TxGetBaselinePos; // (out pBaselinePos: LongInt): HResult; stdcall;
asm
pop edx // return address
pop eax
mov ecx, [eax].TITextServices.Impl
push edx // return address
mov eax, [ecx]
jmp dword ptr [eax].TITextServicesMT.TxGetBaselinePos
end;
procedure TextServices_TxGetNaturalSize; // (dwAspect: DWord; hdcDraw, hicTargetDev: HDC; ptd: PDVTargetDevice; dwMode: DWord; const psizelExtent: TSizeL; var pwidth, pheight: LongInt): HResult; stdcall;
asm
pop edx // return address
pop eax
mov ecx, [eax].TITextServices.Impl
push edx // return address
mov eax, [ecx]
jmp dword ptr [eax].TITextServicesMT.TxGetNaturalSize
end;
procedure TextServices_TxGetDropTarget; // (out ppDropTarget: IDropTarget): HResult; stdcall;
asm
pop edx // return address
pop eax
mov ecx, [eax].TITextServices.Impl
push edx // return address
mov eax, [ecx]
jmp dword ptr [eax].TITextServicesMT.TxGetDropTarget
end;
procedure TextServices_OnTxPropertyBitsChange; // (dwMask, dwBits: DWord): HResult; stdcall;
asm
pop edx // return address
pop eax
mov ecx, [eax].TITextServices.Impl
push edx // return address
mov eax, [ecx]
jmp dword ptr [eax].TITextServicesMT.OnTxPropertyBitsChange
end;
procedure TextServices_TxGetCachedSize; // (out pdwWidth, pdwHeight: DWord): HResult; stdcall;
asm
pop edx // return address
pop eax
mov ecx, [eax].TITextServices.Impl
push edx // return address
mov eax, [ecx]
jmp dword ptr [eax].TITextServicesMT.TxGetCachedSize
end;
var
TextServicesMethodTable: TITextServicesMT = (
// IUnknown
QueryInterface: TextServices_QueryInterface;
_AddRef: TextServices_AddRef;
_Release: TextServices_Release;
// ITextServices
TxSendMessage: TextServices_TxSendMessage;
TxDraw: TextServices_TxDraw;
TxGetHScroll: TextServices_TxGetHScroll;
TxGetVScroll: TextServices_TxGetVScroll;
OnTxSetCursor: TextServices_OnTxSetCursor;
TxQueryHitPoint: TextServices_TxQueryHitPoint;
OnTxInPlaceActivate: TextServices_OnTxInPlaceActivate;
OnTxInPlaceDeactivate: TextServices_OnTxInPlaceDeactivate;
OnTxUIActivate: TextServices_OnTxUIActivate;
OnTxUIDeactivate: TextServices_OnTxUIDeactivate;
TxGetText: TextServices_TxGetText;
TxSetText: TextServices_TxSetText;
TxGetCurTargetX: TextServices_TxGetCurTargetX;
TxGetBaselinePos: TextServices_TxGetBaselinePos;
TxGetNaturalSize: TextServices_TxGetNaturalSize;
TxGetDropTarget: TextServices_TxGetDropTarget;
OnTxPropertyBitsChange: TextServices_OnTxPropertyBitsChange;
TxGetCachedSize: TextServices_TxGetCachedSize
);
type
PITextHostMT = ^TITextHostMT;
TITextHostMT = packed record
// IUnknown
QueryInterface: TQueryInterface;
_AddRef,
_Release: TProcedure;
// ITextHost
TxGetDC,
TxReleaseDC,
TxShowScrollBar,
TxEnableScrollBar,
TxSetScrollRange,
TxSetScrollPos,
TxInvalidateRect,
TxViewChange,
TxCreateCaret,
TxShowCaret,
TxSetCaretPos,
TxSetTimer,
TxKillTimer,
TxScrollWindowEx,
TxSetCapture,
TxSetFocus,
TxSetCursor,
TxScreenToClient,
TxClientToScreen,
TxActivate,
TxDeactivate,
TxGetClientRect,
TxGetViewInset,
TxGetCharFormat,
TxGetParaFormat,
TxGetSysColor,
TxGetBackStyle,
TxGetMaxLength,
TxGetScrollBars,
TxGetPasswordChar,
TxGetAcceleratorPos,
TxGetExtent,
OnTxCharFormatChange,
OnTxParaFormatChange,
TxGetPropertyBits,
TxNotify,
TxImmGetContext,
TxImmReleaseContext,
TxGetSelectionBarWidth: TProcedure;
end;
PITextHost = ^TITextHost;
TITextHost = record
MethodTable: PITextHostMT;
RefCount: Cardinal;
Impl: TTextHostImpl;
end;
function TextHost_QueryInterface(const This: IUnknown; const riid: TGUID; out ppvObj): HResult; stdcall;
begin
if IsEqualGUID(riid, IUnknown) or IsEqualGUID(riid, ITextHost) then begin
Pointer(ppvObj) := Pointer(This);
IUnknown(ppvObj)._AddRef;
Result := S_OK;
end else begin
Pointer(ppvObj) := nil;
Result := E_NoInterface;
end;
end;
procedure TextHost_AddRef; // (const This: IUnknown): ULong; stdcall;
{begin
Result := InterlockedIncrement(PITextHost(This).RefCount);}
asm
mov eax, [esp + 4]
lea eax, [eax].TITextHost.RefCount
push eax
call InterlockedIncrement
ret 4 // return from stdcall function
end;
procedure ReleaseTextHost(const Host: PITextHost);
begin
Host.Impl.Free;
Dispose(Host);
end;
procedure TextHost_Release; // (const This: IUnknown): ULong; stdcall;
{begin
Result := InterlockedDecrement(PITextHost(This).RefCount);
if Result = 0 then ReleaseTextHost(PITextHost(This));}
asm
mov eax, [esp + 4]
lea eax, [eax].TITextHost.RefCount
push eax
call InterlockedDecrement
test eax, eax
jnz @@exit
mov eax, [esp + 4]
call ReleaseTextHost
xor eax, eax
@@exit:
ret 4 // return from stdcall function
end;
// When these stubs get called, it is as thiscall methods. We translate it
// to a stdcall method and then jump to the Delphi object method that's
// implementing the interface. ECX refers to the PITextHost value that
// CreateTextHost returned as an ITextHost reference. Besides a pointer to
// a VMT of these method stubs, that record also contains a reference to
// the TTextHostImpl instance, eight bytes into the record. That reference
// gets stored in EAX and then pushed onto the stack underneath the return
// address. Then we fetch the address of the method being wrapped from the
// TTextHostImpl's VMT and jump to that method.
procedure TextHost_TxGetDC; // : HDC; stdcall;
asm
pop edx // return address
mov eax, [ecx].TITextHost.Impl
push eax
push edx // return address
mov eax, [eax]
jmp dword ptr [eax + vmtoffset TTextHostImpl.TxGetDC]
end;
procedure TextHost_TxReleaseDC; // (hdc: HDC): Integer; stdcall;
asm
pop edx // return address
mov eax, [ecx].TITextHost.Impl
push eax
push edx // return address
mov eax, [eax]
jmp dword ptr [eax + vmtoffset TTextHostImpl.TxReleaseDC]
end;
procedure TextHost_TxShowScrollBar; // (fnBar: Integer; fShow: Bool): Bool; stdcall;
asm
pop edx // return address
mov eax, [ecx].TITextHost.Impl
push eax
push edx // return address
mov eax, [eax]
jmp dword ptr [eax + vmtoffset TTextHostImpl.TxShowScrollBar]
end;
procedure TextHost_TxEnableScrollBar; // (fuSBFlags, fuArrowFlags: Integer): Bool; stdcall;
asm
pop edx // return address
mov eax, [ecx].TITextHost.Impl
push eax
push edx // return address
mov eax, [eax]
jmp dword ptr [eax + vmtoffset TTextHostImpl.TxEnableScrollBar]
end;
procedure TextHost_TxSetScrollRange; // (fnBar: Integer; nMinPos: LongInt; nMaxPos: Integer; fRedraw: Bool): Bool; stdcall;
asm
pop edx // return address
mov eax, [ecx].TITextHost.Impl
push eax
push edx // return address
mov eax, [eax]
jmp dword ptr [eax + vmtoffset TTextHostImpl.TxSetScrollRange]
end;
procedure TextHost_TxSetScrollPos; // (fnBar, nPos: Integer; fRedraw: Bool): Bool; stdcall;
asm
pop edx // return address
mov eax, [ecx].TITextHost.Impl
push eax
push edx // return address
mov eax, [eax]
jmp dword ptr [eax + vmtoffset TTextHostImpl.TxSetScrollPos]
end;
procedure TextHost_TxInvalidateRect; // (const prc: TRect; fMode: Bool); stdcall;
asm
pop edx // return address
mov eax, [ecx].TITextHost.Impl
push eax
push edx // return address
mov eax, [eax]
jmp dword ptr [eax + vmtoffset TTextHostImpl.TxInvalidateRect]
end;
procedure TextHost_TxViewChange; // (fUpdate: Bool); stdcall;
asm
pop edx // return address
mov eax, [ecx].TITextHost.Impl
push eax
push edx // return address
mov eax, [eax]
jmp dword ptr [eax + vmtoffset TTextHostImpl.TxViewChange]
end;
procedure TextHost_TxCreateCaret; // (hbmp: hBitmap; xWidth, yHeight: Integer): Bool; stdcall;
asm
pop edx // return address
mov eax, [ecx].TITextHost.Impl
push eax
push edx // return address
mov eax, [eax]
jmp dword ptr [eax + vmtoffset TTextHostImpl.TxCreateCaret]
end;
procedure TextHost_TxShowCaret; // (fShow: Bool): Bool; stdcall;
asm
pop edx // return address
mov eax, [ecx].TITextHost.Impl
push eax
push edx // return address
mov eax, [eax]
jmp dword ptr [eax + vmtoffset TTextHostImpl.TxShowCaret]
end;
procedure TextHost_TxSetCaretPos; // (x, y: Integer): Bool; stdcall;
asm
pop edx // return address
mov eax, [ecx].TITextHost.Impl
push eax
push edx // return address
mov eax, [eax]
jmp dword ptr [eax + vmtoffset TTextHostImpl.TxSetCaretPos]
end;
procedure TextHost_TxSetTimer; // (idTimer, uTimeout: UInt): Bool; stdcall;
asm
pop edx // return address
mov eax, [ecx].TITextHost.Impl
push eax
push edx // return address
mov eax, [eax]
jmp dword ptr [eax + vmtoffset TTextHostImpl.TxSetTimer]