您不需要流来将文本行从一个传输TRichEdit
到另一个。只需使用该Lines
属性。
Lines
是一种TStrings
类型,所以使用它的方法来操作TRichEdit
文本。
procedure TForm1.richedit1change(Sender: TObject);
var
i: Integer;
begin
RichEdit2.Lines.Clear;
for i := 0 to Pred(RichEdit1.Lines.Count) do
begin
if YourSpecificTestFunction(i) then
RichEdit2.Lines.Add(RichEdit1.Lines[i]);
end;
end;
如果要保留 RTF 格式,可以使用 Zarko Gajic 描述的技术,Append or Insert RTF from one RichEdit to Another
.
另一个简单的选择是使用 windows 剪贴板和 TRichEdit.Selection:
procedure CopyRichEditSelection(Source,Dest: TRichEdit);
begin
// Copy Source.Selection to Dest via ClipBoard.
Dest.Clear;
if (Source.SelLength > 0) then
begin
Source.CopyToClipboard;
Dest.PasteFromClipboard;
end;
end;
这也将保留您的格式,复制选定的部分。
如果您想在没有用户控制的情况下控制选择,请使用TRichEdit.SelStart
将插入符号定位到选择开始的字符,以及SelLength
选择长度。要将插入符号定位在特定行上,请使用:
RichEdit1.SelStart := RichEdit1.Perform(EM_LINEINDEX, Line, 0);
如果您不想使用 windows 剪贴板进行复制/粘贴操作,可以使用流:
Uses RichEdit;
function EditStreamOutCallback(dwCookie: DWORD_PTR; pbBuff: PByte; cb: Longint;
var pcb: LongInt): LongInt; stdcall;
begin
pcb := cb;
if cb > 0 then
begin
TStream(dwCookie).WriteBuffer(pbBuff^, cb);
Result := 0;
end
else
Result := 1;
end;
procedure GetRTFSelection(aRichEdit: TRichEdit; intoStream: TStream);
type
TEditStreamCallBack = function (dwCookie: DWORD_PTR; pbBuff: PByte;
cb: Longint; var pcb: Longint): Longint; stdcall;
TEditStream = packed record // <-- Note packed !!
dwCookie: DWORD_PTR;
dwError: Longint;
pfnCallback: TEditStreamCallBack;
end;
var
editstream: TEditStream;
begin
with editstream do
begin
dwCookie := DWORD_PTR(intoStream);
dwError := 0;
pfnCallback := EditStreamOutCallBack;
end;
aRichedit.Perform( EM_STREAMOUT, SF_RTF or SFF_SELECTION, LPARAM(@editstream));
end;
procedure CopyRichEditSelection(Source,Dest: TRichEdit);
var
aMemStream: TMemoryStream;
begin
Dest.Clear;
if (Source.SelLength > 0) then
begin
aMemStream := TMemoryStream.Create;
try
GetRTFSelection(Source, aMemStream);
aMemStream.Position := 0;
Dest.Lines.LoadFromStream(aMemStream);
finally
aMemStream.Free;
end;
end;
end;