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Como criar um editor de textos

davidzaum

Perguntado por davidzaum,

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Jhonas

Jhonas

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exemplo:

program Notepad;

uses 
 Forms, 
 UnitMain in 'UnitMain.pas'{FormMain},
 Unit1 in 'Unit1.pas'{AboutBox}; 

 {$R *.RES} 

 begin 
 Application.Initialize; 
 Application.CreateForm(TFormMain, FormMain);
 Application.CreateForm(TAboutBox, AboutBox); 
 Application.Run; 
 end. 

unit UnitMain; 

interface

uses 
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, 
 Dialogs, Menus, StdCtrls, ComCtrls; 
  
type 
 TFormMain = class(TForm1)
 RichEdit1: TRichEdit; 
 MainMenu1: TMainMenu; 
 MenuFile: TMenuItem; 
 ItemNew: TMenuItem; 
 ItemOpen: TMenuItem; 
 ItemSave: TMenuItem; 
 ItemSaveAs: TMenuItem;

 N2: TMenuItem; 
 ItemPrint: TMenuItem; 
 N4: TMenuItem; 
 ItemClose: TMenuItem; 
 SaveDialog1: TSaveDialog;
 OpenDialog1: TOpenDialog; 
 N1: TMenuItem; 
 ItemFont: TMenuItem; 
 FontDialog1: TFontDialog; 
 PopupMenu1:TPopupMenu; 
 ItemUndo: TMenuItem;
 N3: TMenuItem; 
 ItemRedo: TMenuItem; 
 ItemCut: TMenuItem; 
 ItemCopy: TMenuItem; 
 ItemPaste: TMenuItem; 
 ItemDelete: TMenuItem;
 N5: TMenuItem; 
 ItemSelectAll:TMenuItem; 
 N6: TMenuItem; 
 ItemFindText: TMenuItem; 
 ItemFindAndReplace: TMenuItem; 
 FindDialog1: TFindDialog;
 MenuEdit: TMenuItem; 
 ItemUndo1:TMenuItem; 
 ItemRedo1: TMenuItem; 
 N7: TMenuItem; 
 ItemCut1: TMenuItem; 
 ItemCopy1: TMenuItem;
 ItemPaste1: TMenuItem; 
 ItemDelete1: TMenuItem; 
 N8: TMenuItem; 
 ItemSelectAll1: TMenuItem; 
 N9: TMenuItem; 
 ItemFind1: TMenuItem; 
 ItemFindAndPlace1: TMenuItem;
 N10: TMenuItem; 
 ItemAutoWarp1: TMenuItem; 
 N11: TMenuItem; 
 ItemAutoWarp: TMenuItem; 
 ReplaceDialog1: TReplaceDialog; 
 N12: TMenuItem; 
 N13: TMenuItem;
 N14: TMenuItem; 
 procedure ItemNewClick(Sender: Tobject); 
 procedure ItemOpenClick(Sender: Tobject); 
 procedure ItemSaveClick(Sender: Tobject); 
 procedure ItemPrintClick(Sender: Tobject); 
 procedure ItemCloseClick(Sender: Tobject); 
 procedure ItemFondClick(Sender: Tobject);
 procedure PopupMenu1Popup(Sender: Tobject); 
 procedure ItemUndoClick(Sender: Tobject); 
 procedure ItemRedoClick(Sender: Tobject); 
 procedure ItemCutClick(Sender: Tobject); 
 procedure ItemCopyClick(Sender: Tobject); 
 procedure ItemPasteClick(Sender: Tobject); 
 procedure ItemDelectClick(Sender: Tobject);
 procedure ItemSelectClick(Sender: Tobject); 
 procedure ItemFindTextClick(Sender: Tobject); 
 procedure FindDialog1Find(Sender: Tobject); 
 procedure ItemAutoWarp1Click(Sender: Tobject); 
 procedure ItemFindAndReplaceClick(Sender: Tobject); 
 procedure ReplaceDialog1Replace(Sender: Tobject);
 procedure FormCreat(Sender: Tobject); 
 procedure MenuFileClick(Sender: Tobject); 
 procedure FromCloseQuery(Sender: Tobject; var CanClose: Boolean); 
 procedure N14Click(Sender: Tobject); 
 private 
 sFileName:String;
 Function CheckhasModified:Boolean;
 Function SaveAsFile:Boolean;
 Function SaveFile:Boolean;
 Function MyOpenFile(FileName:String):Boolean;
 { Private declarations } 
 public
 { Public declarations } 
 end; 

var 
 FormMain: TFormMain; 

implementation 

uses RichEdit,Unit1; 

{$R *.dfm} 

function TFormMain.CheckHasModified: Boolean;
begin 
 Result:=not RichEdit1.Modified; 
 if not Result then 
 begin 
 Case Application.MessageBox('??????!??????','??',
 MB_YESNO+mB_ICONQUESTION) OF 
 IDYES:Result:=SaveFile; 
 IDNO:Result:=True; 
 end; 
 end; 
end;

 procedure TFormMain.ItemNewClick(Sender: TObject); 
 begin
 If CheckHasModified Then 
 begin 
 RichEdit1.Lines.Clear;
 RichEdit1.Modified:=False; 
 sFileName:='???'; 
 end; 
end;

function TformMain.SaveAsFile:Boolean;
begin
 Result:=False; 
 if SaveDialog1.Execute then 
 begin 
 RichEdit1.Lines.SaveToFile(SaveDialog1.FileName0; 
 RichEdit1.Modified:=False;
 sFileName:=SaveDialog1.FileName; 
 Result:=True; 
 end; 
end;

procedure TFormMain.ItemOpenClick(Sender: TObject);
begin
 if OpenDialog1.Execute then 
 MyOpenFile(OpenDialog1.FileName); 
end;

Procedure TFormMain.ItemSaveClick(Sender: TObject);
begin
 SaveFile; 
end; 

function TFormMain.SaveFile: Boolean; 
begin
 If sFileName='???' then 
 Result:=SaveAsFile 
 else 
 begin 
 RichEdit1.Lines.SaveToFile(sFileName); 
 RichEdit1.Modified:=False;
 Result:=True; 
 end; 
end;

 procedure TFormMain.ItemSaveAsClick(Sender:TObject); 
 begin
 SaveAsFile;
 end; 

 procedure TFormMain.ItemPrintClick(Sender:TObject); 
 begin
 RichEdit1.Print(sFileName);
 end; 

 procedure TFormMain.ItemCloseClick(Sender: TObject); 
 begin
 Close; 
 end;

 procedure TFormMain.ItemFontClick(Sender: TObject); 
 begin
 FontDialog1.Font.Assign(RichEdit1.Font); 
 if FontDialog1.Execute then 
 RichEdit1.Font.Assign(FontDialog1.Font);
 end; 

 procedure TFormMain.PopupMenu1Popup(Sender: TObject); 
 begin
 ItemUndo.Enabled:=(RichEdit1.Perform(EM_CANUNDO,0,0<>0); 
 ItemRedo.Enabled:=(RichEdit1.Perform(EM_CANREDO,0,0<>0);
 ItemCut.Enabled:=(RichEdit1.Perform(EM_SELECTIONTYPE,0,0)<>0); 
 ItemCopy.Enabled:=ItemCut.Enabled; 
 ItemPaste.Enabled:=(RichEdit1.Perform(EM_CANPASTE,0,0)<>0); 
 ItemAutoWarp.Checked:=RichEdit1.WordWrap; 
 ItemUndo1.Enabled:=(RichEdit1.Perform(EM_CANUNDO,0,0<>0); 
 ItemRedo1.Enabled:=(RichEdit1.Perform(EM_CANREDO,0,0<>0);
 ItemCut1.Enabled:=(RichEdit1.Perform(EM_SELECTIONTYPE,0,0)<>0); 
 ItemCopy1.Enabled:=ItemCut.Enabled; 
 ItemPaste1.Enabled:=(RichEdit1.Perform(EM_CANPASTE,0,0)<>0); 
 ItemAutoWarp1.Checked:=RichEdit1.WordWrap; 
 end; 

 procedure TFormMain.ItemUndoClick(Sender: TObject); 
 begin
 RichEdit1.Perform(EM_UNDO,0,0); 
 end; 

 procedure TFormMain.ItemRedoClick(Sender:TObject);
 begin
 RichEdit1.Perform(EM_REDO,0,0); 
 end; 

 procedure TFormMain.ItemCutClick(Sender: TObject); 
 begin
 RichEdit1.Perform(WM_CUT,0,0); 
 end; 

 procedure TFormMain.ItemCopyClick(Sender:TObject); 
 begin
 RichEdit1.Perform(WM_COPY,0,0);
 end; 

 procedure TFormMain.ItemPasteClick(Sender:TObject); 
 begin
 RichEdit1.Perform(WM_Paste,0,0); 
 end;

 procedure TFormMain.ItemDeleteClick(Sender: TObject);
 begin
 RichEdit1.Perform(WM_CLEAR,0,0); 
 end; 

 procedure TFormMain.ItemSelectAllClick(Sender: TObject); 
 Var P:TPoint;
 begin 
 P:=Point(0,0); 
 P:=RichEdit1.ClientToScreen(P); 
 FindDialog1.Position := P;
 FindDialog1.Execute; 
 end; 

 procedure TFormMain.FindDialog1Find(Sender: TObject); 
 var
 FoundAt: LongInt;
 StartPos, ToEnd: Integer; 
 st:TSearchTypes; 
 begin 
 with RichEdit1 do 
 begin 
 StartPos :=SelStart + SelLength;
 ToEnd := Length(Richedit1.Text) - StartPos; 
 st:=[]; 
 if frMatchCase in FindDialog1.Options then 
 st:=st+[stMatchCase]; 
 if frWholeWord in FindDialog1.Options then 
 st:=st+[stWholeWord];
 FoundAt := FindText(FindDialog1.FindText,StartPos,Toend,st); 
 if FoundAt <> -1 then 
 begin 
 SelStart := FoundAt; 
 SelLength := Length(FindDialog1.FindText); 
 end else
 ShowMessage('????!') 
 end; 
 end; 

 procedure TFormMain.ItemAutoWarp1Click(Sender: TObject);
 begin
 RichEdit1.WordWrap:=not RichEdit1.WordWrap; 
 ItemAutoWarp1.Checked:=RichEdit1.WordWrap; 
 ItemAutoWarp.Checked:=RichEdit1.WordWrap; 
 end;

 Function TFormMain.MyOpenFile(FileName:String):Boolean; 
 begin
 Result:=False; 
 if CheckHasModified then
 begin 
 try 
 RichEdit1.Lines.LoadFromFile(FileName); 
 RichEdit1.Modified:=False 
 sFileName:=FileName;
 Result:=True; 
 except 
 on E:Exception do 
 ShowMessage(E.Message); 
 end;
 end; 
 end; 

 procedure TFormMain.ItemFindAndREplaceClick(Sender:TObject); 
 Var P:TPoint;
 begin 
 P:=Point(0,0); 
 P:=RichEdit1.ClientToScreen(P); 
 ReplaceDialog1.Position := P; 
 ReplaceDialog1.Execute;
 end; 

 procedure TFormMain.ReplaceDialog1Replace(Sender: TObject); 
 Var P:TPoint;
 begin
 P:=Point(0,0); 
 P:=RichEdit1.ClientToScreen(P); 
 ReplaceDialog1.Position := P; 
 ReplaceDialog1.Execute; 
 end;

 procedure TFormMain.ReplaceDialog1Replace(Sender: TObject): 
 var
 FoundAt: LongInt; 
 StartPos, ToEnd: Integer;
 st:TSearchTypes; 
 begin 
 with RichEdit1 do 
 begin 
 StartPos := SelStart + SelLength;
 ToEnd := Length(RichEdit1.Text) - StartPos; 
 st:=[]; 
 if frMatchCase in ReplaceDialog1.Options then 
 st:=st+[stMatchCase]; 
 if frWholeWord in ReplaceDialog1.Options.then
 st:=st+[stWholeWord]; 
 FoundAt := FindText(Replacedialog1.FindText, StartPos, ToEnd, st); 
 While FoundAt <> -1 do 
 begin 
 SelStart := FoundAt;
 SelLength := Length(ReplaceDialog1.FindText); 
 Perform(EM_REPLACESEL,1,Interger(PChar(Replacedialog1.ReplaceText))); 
 SelStart := FoundAt; 
 SelLength := Length(ReplaceDialog1.ReplaceText); 
 if not (frReplaceAll in ReplaceDialog1.Options) then
 Break; 
 StartPos:=SelStart; 
 ToEnd := Length(RichEdit1..Text) - StartPos; 
 FoundAt := FindText(ReplaceDialog1.FindText, StartPos,ToEnd,st); 
 end;
 FoundAt:= FindText(ReplaceDialog1.FindText,StartPos,ToEnd,st); 

 if FoundAt=-1 then
 ShowMessage('????!'); 
 end;
end;

 procedure TFormMain.FormCreate(Sender: TObject); 
 Var s1FileName,TemStr,ParamString:String;
 i,FromIndex,ToIndex,iPox:Integer;
 Reg:TRegistry; 
 begin 
 try 
 Reg:=TRegistry.Create;
 try 
 Reg.RootKey:=HKEY_CLASSES_ROOT; 
 Reg.OpenKey('*\shell\MyNotePad',True); 
 Reg.WriteString('','????????');
 Reg.CloseKey; 
 Reg.OpenKey('*\Shell\MyNotePad\Command',True); 
 Reg.WriteString('','"'+ParamStr(0)+'" "%1"'); 
 Reg.CloseKey;
 finally 
 Reg.Free; 
 end; 
 except
 end;
 if ParamCount>=1 then 
 begin 
 i:=1;
 ParamString:=ParamStr(i); 
 While (ParamString[1]='/') and(i<=ParamCount) do 
 begin 
 Inc(i);
 ParamString:=ParamStr(i); 
 end; 
 FromIndex:=i; 
 ParamString:=ParamStr(i);
 if ParamString[1]='/' then 
 Exit; 
 While i<=ParamCount do 
 begin
 if ParamString[1]='/' then 
 Break; 
 Inc(i); 
 ParamString:=ParamStr(i);
 end; 
 ToIndex:=i; 
 s1FileName:=GetCommandLine; 
 ParamString:=ParamStr(FromIndex);
 iPos:=Pos(ParamString,s1Filename); 
 TemStr:=ParamString; 
 Delete(s1Filename,1,iPos-1+length(TemStr));
 For i:=FromIndex+1 to ToIndex do 
 begin 
 ParamString:=ParamStr(i);
 iPos:=pos(ParamString,s1FileName); 
 TemStr:=TemStr+copy(s1FileName,1,iPos+length(ParamString)); 
 end;
 s1FileName:=TemStr; 
 MyOpenFile(s1FileName); 
 For i:=1 to ParamCount do
 begin 
 if (ParamStr(i)='/p') or(ParamStr(i)='/p' then 
 begin
 if Application.MessageBox('????','??',MB_YESNO+MB_ICONQUESTION) 
 =IDYes then 
 RichEdit1.Print(sFileName);
 Break; 
 end; 
 end
 end; 

end;

 procedure TFormMain.MenuFileClick(Sender: Tobject); 
 begin
 ItemSave.Enabled:=RichEdit1.Modified; 
 end;

 procedure TFormMain.FormCloseQuery(Sender: TObject; VAr CanClose:Boolean);
 begin
 CanClose:=not RichEdit1.Modified;
 if not CanClose then
 begin
 Case Application.MessageBox('??????!??????','??',
 MB_YESNOCANCEL+MB_ICONQUESTION) of
 IDYES:CanClose:=SaveFile;
 IDNo:CanClose:=True;
 end;
 end;
 end;

 procedure TFormMain.N14Click(Sender:TObject);
 begin
 AboutBox.showmodal;
 end;
end.

abraço

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