Simple text editor (Delphi source code)

A simple text editor is designed to create, edit, and save common text files.

Unit U nit1;

Interface

Uses
Windows, messages, sysutils, variants, classes, graphics, controls, forms,
Dialogs, stdctrls, extctrls;

Type
Tform1 = Class (tform)
Panel1: tpanel;
Memo1: tmemo;
Opendialog1: topendialog;
Savedialog1: tsavedialog;
Button1: tbutton;
Button2: tbutton;
Button3: tbutton;
Button4: tbutton;
Button5: tbutton;
Button6: tbutton;
Button7: tbutton;
Procedure button1click (Sender: tobject );
Procedure button2click (Sender: tobject );
Procedure button3click (Sender: tobject );
Procedure button4click (Sender: tobject );
Procedure button5click (Sender: tobject );
Procedure button6click (Sender: tobject );
Procedure button7click (Sender: tobject );
Private
{Private Declarations}
Public
{Public declarations}
End;

VaR
Form1: tform1;
VaR
F: textfile;
Wfilename: string;
Flag: Boolean;

Implementation

{$ R *. DFM}

Procedure tform1.button1click (Sender: tobject );
Begin
Assignfile(f,'newfile.txt ');
Form1.caption: Response 'newfile.txt ';
Wfilename: Invalid 'newfile.txt ';
Rewrite (f );
Memo1.enabled: = true;
Button1.enabled: = false;
Button2.enabled: = false;
Button3.enabled: = false;
Button4.enabled: = true;
Button5.enabled: = true;
Button6.enabled: = true;
Button7.enabled: = true;
Closefile (f );
End;

Procedure tform1.button2click (Sender: tobject );
VaR
Line: string;
Begin
If opendialog1.execute then
Begin
Assignfile (F, opendialog1.filename );
Reset (f );
Form1.caption: = opendialog1.filename;
Memo1.enabled: = false;
Flag: = true;
While not EOF (f) Do
Begin
Readln (F, line );
Memo1.lines. Add (line );
End;
Button1.enabled: = false;
Button2.enabled: = false;
Button3.enabled: = false;
Button4.enabled: = false;
Button5.enabled: = false;
Button6.enabled: = true;
Button7.enabled: = true;
Closefile (f );
End;
End;

Procedure tform1.button3click (Sender: tobject );
VaR
Line: string;
Begin
If opendialog1.execute then
Begin
Wfilename: = opendialog1.filename;
Assignfile (F, wfilename );
Form1.caption: = wfilename;
Reset (f );
Memo1.enabled: = true;
While not EOF (f) Do
Begin
Readln (F, line );
Memo1.lines. Add (line );
End;
Button1.enabled: = false;
Button2.enabled: = false;
Button3.enabled: = false;
Button4.enabled: = true;
Button5.enabled: = true;
Button6.enabled: = true;
Button7.enabled: = true;
Closefile (f );
End;
End;

Procedure tform1.button4click (Sender: tobject );
VaR
I, lastline: integer;
Begin
Lastline: = memo1.lines. Add ('')-1;
Assignfile (F, wfilename );
Rewrite (f );
For I: = 0 to lastline do
Begin
Write (F, memo1.lines [I]);
End;
Closefile (f );
End;

Procedure tform1.button5click (Sender: tobject );
VaR
I, lastline: integer;
Writefile: textfile;
Begin
If savedialog1.execute then
Begin
Wfilename: = savedialog1.filename;
Assignfile (writefile, wfilename );
Rewrite (writefile );
Form1.caption: = wfilename;
Lastline: = memo1.lines. Add ('')-1;
For I: = 0 to lastline do
Begin
Writeln (writefile, memo1.lines [I]);
End;
Closefile (writefile );
End;
End;

Procedure tform1.button6click (Sender: tobject );
VaR
I: integer;
Begin
If not flag then
I: = messagedlg ('Save file? ', Mtconfirmation, mbyesnocancel, 0 );
If I <> 2 then
Begin
If I = 6 then
Button4click (sender );
Memo1.clear;
Form1.caption: = '';
Memo1.enabled: = false;
Button1.enabled: = true;
Button2.enabled: = true;
Button3.enabled: = true;
Button4.enabled: = false;
Button5.enabled: = false;
Button6.enabled: = false;
Button7.enabled: = true;
End;
Flag: = false;
End;

Procedure tform1.button7click (Sender: tobject );
Begin
Close;
End;

End.