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TVTXTDMO.PAS
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Pascal/Delphi Source File
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1991-06-11
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4KB
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154 lines
{************************************************}
{ }
{ Turbo Pascal 6.0 }
{ Turbo Vision TTerminal demo program }
{ }
{ Copyright (c) 1990 by Borland International }
{ }
{************************************************}
program TVTxtDmo;
{$M 16384,16384,655360}
uses Dos, Objects, Views, TextView, MsgBox, App;
type
PTerminalWindow = ^TTerminalWindow;
TTerminalWindow = object(TWindow)
constructor Init(Bounds: TRect; WinTitle: String; WindowNo: Word;
var Interior: PTerminal; ABufSize: Word);
function MakeInterior(Bounds: TRect; ABufSize: Word): PTerminal;
end;
PMyApp = ^TMyApp;
TMyApp = object(TApplication)
constructor Init;
procedure ShowTerminalWindow;
end;
procedure CheckParamList;
var
F: file;
begin
if ParamCount <> 1 then
begin
Writeln('Syntax: TVTXTDMO <file to view>');
Halt(1);
end;
Assign(F, ParamStr(1));
{$I-}
Reset(F);
{$I+}
if IOResult <> 0 then
begin
Writeln('Cannot open file (', ParamStr(1), ')');
Halt(1);
end;
Close(F);
end;
{ TTerminalWindow }
constructor TTerminalWindow.Init(Bounds: TRect; WinTitle: String;
WindowNo: Word; var Interior: PTerminal; ABufSize: Word);
begin
TWindow.Init(Bounds, WinTitle, WindowNo);
Interior := MakeInterior(Bounds, ABufSize);
Insert(Interior);
end;
function TTerminalWindow.MakeInterior(Bounds: TRect;
ABufSize: Word): PTerminal;
begin
GetExtent(Bounds);
Bounds.Grow(-1, -1);
MakeInterior := New(PTerminal, Init(Bounds,
StandardScrollBar(sbHorizontal + sbHandleKeyboard),
StandardScrollBar(sbVertical + sbHandleKeyboard),
ABufSize));
end;
constructor TMyApp.Init;
begin
CheckParamList;
TApplication.Init;
ShowTerminalWindow;
end;
procedure TMyApp.ShowTerminalWindow;
var
Demo: PTerminalWindow;
Interior: PTerminal;
T: Text;
R: TRect;
FText: Text;
FGeneric: file of byte;
St: String;
Result: Word;
const
BuffSize: Word = 8192;
begin
{ Open the file as a generic DOS file to get the file size.
CheckParamList has already verified that the file exists
and can be opened. }
Assign(FGeneric, ParamStr(1));
Reset(FGeneric);
if MaxAvail - 1000 < BuffSize then
BuffSize := MaxAvail - 1024; { leave at least 1K free }
if FileSize(FGeneric) > BuffSize then
begin
Str(BuffSize, St);
{ ignore result, just post a message }
Result := MessageBox('File is too big to fit in a TTerminal buffer.'#13+
'Only the first ' + st + ' bytes of the file ' +
'will be displayed.', nil, mfOkButton + mfWarning);
end
else
{ filesize < buffsize, so reduce the buffer size to conserve RAM }
BuffSize := FileSize(FGeneric);
Close(FGeneric);
{ Initialize the terminal window object }
R.Assign(10, 1, 70, 18);
Demo := New(PTerminalWindow, Init(R, ParamStr(1), wnNoNumber,
Interior, BuffSize));
Desktop^.Insert(Demo);
{ Assign the TTerminal interior text device driver to a text "file" }
AssignDevice(T,PTerminal(Interior));
Rewrite(T);
Writeln(T, '');
{ Open the file as a text file for reading. }
Assign(FText, ParamStr(1));
Reset(FText);
{ Copy lines into scroller until eof or buffer is full }
repeat
Readln(FText, St);
Writeln(T, St);
until Eof(FText) or (not Interior^.CanInsert(Length(St)));
Close(FText);
Close(T);
{ set the scroller to its top }
Interior^.ScrollTo(0, 0);
end;
var
MyMain: TMyApp;
begin
MyMain.Init;
MyMain.Run;
MyMain.Done;
end.