1. Linux RAD/GUI Development
Kylix
Rapid Application Development (RAD), GUI Development for Linux from Borland
by Leland Brode
ELB Software

2. Linux GUI Development Presentation Outline
Background on GUI Development
Overview of Kylix
Demo GUI Tools
Demo Delphi
Demo Kylix
by Leland Brode
ELB Software

3. Linux GUI Development Kylix RAD/GUI tool for Linux
Port of Delphi for Windows
Runs on Linux
Builds, compiles native Linux applications
Cross platform – Windows/Linux

4. GUI Dev Background Windows 3.0 – 1990 Basic, COBOL, C
Generates Messages
Basic, COBOL, C
All Text
Visual Basic – 1991
First GUI Dev Tool
Event Handlers – code that runs before or after an Event
Draw window instead of code it
Most widely used language
“Visual Basic 6 Bible” - Smith Whistler, & Marquis

5. GUI Dev Background Other GUI Dev Tools PowerBuilder Visual Age
Digitalk, ParcPlace Smalltalk
Forte ( now at Sun)
Visual C++
Borland C++
Borland Delphi
Borland C++Builder
Visual Café - Java
JBuilder - Java

6. Linux Developement GNU Linux Toolkit Perl, Shell scripting GCC
Compiles C, C++, Objective C, Fortran
Handles Front-ends for Pascal, Modula-3, Ada
Distributed with Linux
Perl, Shell scripting

7. Linux Developement Qt Class Library C++ Cross Platform
Qt/Windows
Qt/X11 (Linux, Solaris, HPUX, AIX, etc)
Qt/Mac
GPL – Free for non-commercial apps
Qt was used to build KDE
from Trolltech in Norway

8. Linux Development Qt Class Libray Qwidget base class Event Handlers
mousePressEvent (QMouseEvent &);
mouseMove Event (…
mousePressEvent (…
enterEvent (…
Class QMouseEvent : public Qevent {
public:
int x();
int y();
int button();
int state();
“Linux Programming Unleashed” – Kurt Wall - SAMS

9. Linux Development Open Source IDE’s KDevelop – www.kdevelop.org
KDE Studio –
Code Crusader –
VDK Builder – vdkbuilder.sourceforge.net
Source-Navigator – sources.redhat.com/sourcenav
“C/C++ Users Journal”, March 2001 –

10. Delphi Background Borland’s Delphi = Pascal, plus
Borland’s implementation of OO in Pascal, plus
GUI IDE, plus
Visual Component Library (VCL)
- encapsulates Windows controls

11. Delphi Pascal Pascal dev by Niklas Wirth (Swiss, 1970)
Versions: U of C San Diego, Borland
Borland’s Turbo Pascal ?
Turbo Pascal 3.0 for DOS
Object Extensions to Pascal ?
Turbo Pascal for Windows
Delphi - OO Pascal – 1995
polymorphism, inheritance, encapsulation

12. Delphi GUI Integrated Development Environment
Based on Visual Basic model

13. Delphi IDE project manager code editor GUI form designer
keeps track of all source files for a project
code editor
code completion
GUI form designer
integrated debugger
watch variables
change variables
breakpoints
step through code

14. Kylix Port of Delphi to Linux OO Pascal Delphi IDE
native Linux compiler
Class Library - CLX
Object wrappers for Qt widgets
Borland chose Qt over GTK+
Delphi’s VCL re-engineered to CLX

15. Kylix Class Libraries CLX is to Kylix VCL is to Delphi, C++Builder
MFC is to Visual C++
Qt is to KDE
GTK is to GNOME
CLX runs on Linux and Windows

16. Delphi VCL Class Library Object wrappers for Windows Controls TObject|
TControl __
| |
TForm TButton

17. Kylix CLX Class Library Object wrappers for Qt Widgets
TObject |
TControl __
| |
TForm Tbutton
CLX also in Delphi 6, and C++Bldr for cross platform

18. Kylix Pascal Language Source File = Unit
Units -> compile, link -> executable
code - .pas file
form - .dfm file
( each form has a .pas file )

19. Kylix Pascal Language Data types Arrays –
Integer – to
Cardinal 0 to 4,294,967,785
Byte to 255
Double floating point
Currency
Arrays –
MyArray : array[0..10] of Integer; // fixed
MyArray : array of Integer; // dynamic
SetLength(MyArray, length); // allocates memory for dynamic array
MyArray[length-1] := 1,024 // assignment

20. Kylix Pascal Language String – dynamic Pointers Exceptions File IO
Concat, Copy, Delete, Insert, Length, Pos, SetLength
Pointers
Exceptions
Try-except (same as try-catch in java, c++)
File IO
function – returns value
procedure – no return value

21. Kylix Pascal Language - function
function Factorial(Number : Cardinal): Int64;
var
N : Cardinal;
begin
Result := 1;
for N := 2 to Number do
Result := Result * N;
end;

22. Kylix Pascal Language – class definition type TAccount = class private
fNumber : Cardinal;
fBalance : Currency;
public
procedure WithDraw(Amount : Currency);
end;
TSavingsAccount = class (TAccount)
fReturnCheck : Boolean
TCertificateof Deposit = class(TSavingsAccount)
fTerm : Cardinal;

23. Kylix Pascal Language – use classes var CD1, CD2 : TAccount; begin
CD1 := TCertificateofDeposit.Create;
CD2 := TCertificateofDeposit.Create; …
CD1.WithDraw(100.00);
CD1.Free;
CD2.Free;
end;

24. Kylix Pascal Language – Records and Arrays type PersonType = record
LastName : String[10];
FirstName : String[10];
EmployeeNumber : Integer;
end; { Persontype }
MyArrayType = array [1..5] of PersonType;
var
PersonArray : MyArrayType;
begin
PersonArray[1].FirstName := ‘Donald’;
PersonArray[1].LastName := ‘Duck’; …

25. Kylix Pascal Language – Components and Arrays var
ButtonArray : array of TButton;
i, Num : integer;
begin
Num :=0;
for i := 0 to Self.ComponentCount –1 do // ‘Self’ same as ‘this’ in C++
if Self.Components[i] is TButton then
Inc(Num);
SetLength(ButtonArray, Num);
ButtonArray[Num-1] := TButton(Components[i]);
end;

26. Kylix Pascal Language – Comparison Pascal… var i : Integer; begin
int i;
i = 1;
Perl…
my $i;
$i = 1;

27. Kylix Pascal Language – Comparison Pascal… var i : Integer;
name String[20];
begin
if i = 1 then
name := ‘Leland’;
i := i + 1;
end;
C++…
int i;
char name[20];
if(i == 1) {
strcpy(name, “Leland”);
i = i + 1; }
Perl…
my $i;
my $name;
if($i == 1) { $name = ‘Leland’; $i = $i + 1; }

28. Kylix Pascal Language – Comparison Pascal… while i < 100 do Inc(i);
while (i < 100) i++;
Perl…
while ($i < 100) { $i++;}

29. Kylix Pascal Language – Comparison Pascal… for i := 0 to 100 do begin
if i = 50 then Break;
end;
C++…
for( i = 0; i <= 100; i++)
if( i == 50) break;
Perl…
for( $i = 0; $ i <= 100; $i++) {
if( $i == 50) last; }

30. Kylix Qt Libc access to all Qt Widget public Events and Properties
access to all ‘libc’ functions

31. Kylix GUI Applications Database Applications Console Applications
Web Server Applications

32. Kylix Linux Multiprocessing apps Linux Multithreading apps
separate memory, communicate via file system
Linux Multithreading apps
same memory, share resources
TThread base class

33. Kylix GUI Applications - (CLX TForm class)
Form1.Canvas.Brush.Color := clRed;
or := RGB(255, 0, 0);
Form1.Canvas.Rectangle(10, 10, 100, 100);
Form1.Canvas.Pen.color := clBlack;
Form1.Canvas.Pen.Width := 2;
Form1.Canvas.MoveTo(0, 20); // draw line
Form1.Canvas.LineTo(60, 20); // draw line
Form1.Canvas.Font.Name := ‘Arial’;
Form1.Canvas.Font.Size := 24;
Form1.Canvas.TextOut(30,1, ‘Hello World’); // write text

34. Kylix Database Applications db : TClientDataSet
db.FileName := ‘/xxx/nnn/yyy’;
db.Open;
db.Locate(‘EmpNum’, ‘124433’, []);
mystring := db.FieldValues[‘LastName’];

35. Kylix Database Applications db : TSQLDataSet
db.CommandText := ‘select * from ….’;
db.Open;

36. Kylix Database Applications data aware controls
automatically fill in data value from database
automatically update data value to database
controls can be ‘Active’ while building form

37. Kylix Web Applications - raw CGI or - TWebApplication |
TCGIApplication

38. Kylix Kylix Versions Kylix 1, 2, 3 (I am using 2)
Kylix 1, 2 – Delphi (Pascal)
Kylix 3 – add C++ Builder (C++)
Kylix Enterprise - Web, Middleware objects, Database objects
Kylix Professional - Database objects
Kylix Open Edition – Build open source apps licensed under GNU General Public License

39. Kylix Technical Requirements – Kylix 2
Pentium 400 Mhz ( I am using 366 Mhz)
128MB RAM ( I am using 192MB)
175MB disk space
Red Hat 6.2 or higher (I am using 7.2, Kernel 2.4.7)
SuSE 7.0 or higher

40. Kylix
Kylix Download
Kylix 3 currently available
Kylix 2 ??

41. Kylix FreeCLX Project Open Source CLX Class Library
available at SourceForge.net
includes BaseCLX, VisualCLX, and DataCLX classes (brings full functionality to Kylix Open Edition ?)
lack of detailed information on FreeCLX

42. Kylix Bibliography “Visual Basic Bible”, Smith, Whistler, & Marquis
“Delphi in a Nutshell”, Ray Lischer, O’Reilly
“Linux Programming Unleashed”, Kurt Wall, SAMS
“Object Pascal Language Guide”, Borland Delphi 3 Documentation
“Teach Yourself Delphi in 21 Days”, Osier, Grobman, & Batson, SAMS
“Kylix: The Professional Developer’s Guide and Reference”, Jon Shemitz, Apress
“Mastering Kylix 2”, Cantu & Barbini, SYBEX
“Borland Kylix Developer’s Guide”, Calvert, Calvert, Kaster, & Swart, SAMS
“In the Trenches”, by Dale Fuller, LINUX Magazine, January 2002
Product Review of Kylix 2, LINUX Magazine, May 2002
“Kylix vs. gcc Development”
“Technical Overview of the Kylix Compiler”
“Apache Development with Kylix”
Kylix and Qt, excerpts form Kylix newsgroup
Kylix newsgroup – “borland.public.kylix,non-technical”

43. Kylix
product demo…