Linux RAD/GUI Development

1
Linux RAD/GUI Development

• Kylix
• Rapid Application Development (RAD), GUI
  Development for Linux from Borland

by Leland Brode ELB Software
elbrode2_at_attbi.com
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
elbrode2_at_attbi.com
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
• 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 CBuilder
• --------------------------
• Visual Café - Java
• JBuilder - Java

6
Linux Developement

• GNU Linux Toolkit
• 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
• www.trolltech.com

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 IDEs
• KDevelop www.kdevelop.org
• KDE Studio www.thekompany.com/projects/kdestudio
  
• Code Crusader www.newplanetsoftware.com
• VDK Builder vdkbuilder.sourceforge.net
• Source-Navigator sources.redhat.com/sourcenav

C/C Users Journal, March 2001 www.cuj.com
10
Delphi Background

• Borlands Delphi
• Pascal, plus
• Borlands 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
• Borlands Turbo Pascal 1.0 - ?
• Turbo Pascal 3.0 for DOS - 1985
• Object Extensions to Pascal 5.5 - ?
• Turbo Pascal for Windows - 1991
• Delphi - OO Pascal 1995
• polymorphism, inheritance, encapsulation
• http//www.engin.umd.umich.edu/CIS/course.des/cis4
  00/index.html
• http//www.emsps.com/oldtools/borpasv.htm

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Delphi

• GUI Integrated Development Environment
• Based on Visual Basic model

13
Delphi

• IDE
• project manager
• 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

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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
• Delphis VCL re-engineered to CLX

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Kylix

• Class Libraries
• CLX is to Kylix
• VCL is to Delphi, CBuilder
• MFC is to Visual C
• Qt is to KDE
• GTK is to GNOME
• CLX runs on Linux and Windows

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Delphi

• VCL Class Library
• Object wrappers for Windows Controls
• TObject
• TControl __
• TForm TButton

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Kylix

• CLX Class Library
• Object wrappers for Qt Widgets
• TObject
• TControl __
• TForm Tbutton
• CLX also in Delphi 6, and CBldr for cross
  platform

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Kylix

• Pascal Language
• Source File Unit
• Units -gt compile, link -gt executable
• code - .pas file
• form - .dfm file
• ( each form has a .pas file )

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Kylix

• Pascal Language
• Data types
• Integer 2147483648 to 2147483647
• Cardinal 0 to 4,294,967,785
• Byte 0 to 255
• Double floating point
• Currency
• Arrays
• MyArray array0..10 of Integer // fixed
• MyArray array of Integer // dynamic
• SetLength(MyArray, length) // allocates memory
  for dynamic array
• MyArraylength-1 1,024 // assignment

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Kylix

• Pascal Language
• String dynamic
• 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

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Kylix

• Pascal Language class definition
• type
• TAccount class
• private
• fNumber Cardinal
• fBalance Currency
• public
• procedure WithDraw(Amount Currency)
• end
• TSavingsAccount class (TAccount)
• private
• fReturnCheck Boolean
• end
• TCertificateof Deposit class(TSavingsAccount)
• private
• fTerm Cardinal
• end

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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

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Kylix

• Pascal Language Records and Arrays
• type
• PersonType record
• LastName String10
• FirstName String10
• EmployeeNumber Integer
• end Persontype
• MyArrayType array 1..5 of PersonType
• var
• PersonArray MyArrayType
• begin
• PersonArray1.FirstName Donald
• PersonArray1.LastName Duck

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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.Componentsi is TButton then
• begin
• Inc(Num)
• SetLength(ButtonArray, Num)
• ButtonArrayNum-1 TButton(Componentsi)
  
• end
• end

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Kylix

• Pascal Language Comparison
• Pascal
• var
• i Integer
• begin
• i 1
• C
• int i
• i 1
• Perl
• my i
• i 1

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Kylix

• Pascal Language Comparison

Pascal var i Integer name String20 begin if i 1 then begin name Leland i i 1 end end C int i char name20 if(i 1) strcpy(name, Leland) i i 1 Perl my i my name if(i 1) name Leland i i 1
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Kylix

• Pascal Language Comparison
• Pascal
• while i lt 100 do Inc(i)
• C
• while (i lt 100) i
• Perl
• while (i lt 100) i

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Kylix

• Pascal Language Comparison
• Pascal
• for i 0 to 100 do begin
• if i 50 then Break
• end
• C
• for( i 0 i lt 100 i)
• if( i 50) break
• Perl
• for( i 0 i lt 100 i)
• if( i 50) last

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Kylix

• Qt
• access to all Qt Widget public Events and
  Properties
• Libc
• access to all libc functions

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Kylix

• GUI Applications
• Database Applications
• Console Applications
• Web Server Applications

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Kylix

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

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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.FieldValuesLastName

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Kylix

• Database Applications
• db TSQLDataSet
• db.CommandText select from .
• db.Open

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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
• http//www.borland.com/products/downloads/download
  _kylix.html
• Kylix 3 currently available
• Kylix 2 ??

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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, OReilly
• 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 Developers Guide and
  Reference, Jon Shemitz, Apress
• Mastering Kylix 2, Cantu Barbini, SYBEX
• Borland Kylix Developers 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 http//community.borla
  nd.com/article/0,1410,28555,00.html
• Technical Overview of the Kylix Compiler
  http//community.borland.com/article/0,1410,28561,
  00.html
• Apache Development with Kylix
  http//community.borland.com/article/0,1410,28556,
  00.html
• Kylix and Qt, excerpts form Kylix newsgroup
  http//community.borland.com/article/0,1410,21850,
  00.html
• Kylix newsgroup borland.public.kylix,non-techni
  cal

43
Kylix

• product demo