linux gui development

Linux RAD/GUI Development

Kylix

Rapid Application Development (RAD), GUI Development for Linux from Borlandby Leland Brode ELB Software [email protected]

Linux GUI DevelopmentPresentation Outline

Background on GUI DevelopmentOverview of KylixDemo GUI ToolsDemo DelphiDemo Kylixby Leland Brode ELB Software [email protected]

Linux GUI DevelopmentKylix

RAD/GUI tool for LinuxPort of Delphi for Windows Runs on LinuxBuilds, compiles native Linux applicationsCross platform Windows/Linux

GUI Dev BackgroundWindows 3.0 1990

Generates MessagesBasic, COBOL, C

All TextVisual Basic 1991

First GUI Dev ToolEvent Handlers code that runs before or after an EventDraw window instead of code itMost widely used languageVisual Basic 6 Bible - Smith Whistler, & Marquis

GUI Dev BackgroundOther GUI Dev Tools

PowerBuilderVisual AgeDigitalk, ParcPlace SmalltalkForte ( now at Sun)Visual C++Borland C++Borland DelphiBorland C++Builder--------------------------Visual Caf - JavaJBuilder - Java

Linux DevelopementGNU Linux Toolkit

GCCCompiles C, C++, Objective C, FortranHandles Front-ends for Pascal, Modula-3, AdaDistributed with LinuxPerl, Shell scripting

Linux Developement Qt Class Library

C++Cross Platform Qt/WindowsQt/X11 (Linux, Solaris, HPUX, AIX, etc)Qt/MacGPL Free for non-commercial appsQt was used to build KDEfrom Trolltech in Norwaywww.trolltech.com

Linux DevelopmentQt Class LibrayQwidget 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

Linux DevelopmentOpen Source IDEs

KDevelop www.kdevelop.orgKDE Studio www.thekompany.com/projects/kdestudioCode Crusader www.newplanetsoftware.comVDK Builder vdkbuilder.sourceforge.netSource-Navigator sources.redhat.com/sourcenavC/C++ Users Journal, March 2001 www.cuj.com

Delphi BackgroundBorlands Delphi =

Pascal, plusBorlands implementation of OO in Pascal, plusGUI IDE, plusVisual Component Library (VCL) - encapsulates Windows controls

DelphiPascal

Pascal dev by Niklas Wirth (Swiss, 1970)Versions: U of C San Diego, BorlandBorlands Turbo Pascal 1.0 - ?Turbo Pascal 3.0 for DOS - 1985Object Extensions to Pascal 5.5 - ?Turbo Pascal for Windows - 1991Delphi - OO Pascal 1995polymorphism, inheritance, encapsulationhttp://www.engin.umd.umich.edu/CIS/course.des/cis400/index.htmlhttp://www.emsps.com/oldtools/borpasv.htm

DelphiGUI Integrated Development Environment

Based on Visual Basic model

DelphiIDE

project managerkeeps track of all source files for a projectcode editorcode completionGUI form designerintegrated debuggerwatch variableschange variablesbreakpointsstep through code

KylixPort of Delphi to Linux

OO PascalDelphi IDEnative Linux compilerClass Library - CLXObject wrappers for Qt widgetsBorland chose Qt over GTK+Delphis VCL re-engineered to CLX

KylixClass Libraries

CLX is to KylixVCL is to Delphi, C++BuilderMFC is to Visual C++Qt is to KDEGTK is to GNOMECLX runs on Linux and Windows

DelphiVCL Class Library

Object wrappers for Windows Controls

TObject |TControl __ | |TForm TButton

KylixCLX Class Library

Object wrappers for Qt Widgets

TObject |TControl __ | |TForm Tbutton

CLX also in Delphi 6, and C++Bldr for cross platform

KylixPascal Language

Source File = UnitUnits -> compile, link -> executablecode - .pas fileform - .dfm file ( each form has a .pas file )


Data typesInteger 2147483648 to 2147483647Cardinal 0 to 4,294,967,785Byte 0 to 255Double floating pointCurrency Arrays MyArray : array[0..10] of Integer; // fixedMyArray : array of Integer; // dynamicSetLength(MyArray, length); // allocates memory for dynamic arrayMyArray[length-1] := 1,024 // assignment


String dynamicConcat, Copy, Delete, Insert, Length, Pos, SetLengthPointersExceptionsTry-except (same as try-catch in java, c++)File IOfunction returns valueprocedure no return value

KylixPascal Language - function

function Factorial(Number : Cardinal): Int64;var N : Cardinal;begin Result := 1; for N := 2 to Number do Result := Result * N;end;

KylixPascal 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;

KylixPascal Language use classes

var CD1, CD2 : TAccount;begin CD1 := TCertificateofDeposit.Create; CD2 := TCertificateofDeposit.Create; CD1.WithDraw(100.00);

CD1.Free; CD2.Free;end;

KylixPascal 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;

KylixPascal 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 begin Inc(Num); SetLength(ButtonArray, Num); ButtonArray[Num-1] := TButton(Components[i]); end;end;

KylixPascal Language Comparison

Pascalvar i : Integer;begin i := 1;

C++ int i; i = 1;

Perlmy $i;$i = 1;


Pascalvar i : Integer; name String[20];begin if i = 1 then begin name := Leland; i := i + 1; end;end;C++ int i; char name[20]; if(i == 1) { strcpy(name, Leland); i = i + 1; }Perlmy $i;my $name;if($i == 1) { $name = Leland; $i = $i + 1; }


Pascal while i < 100 do Inc(i);

C++ while (i < 100) i++; Perl while ($i < 100) { $i++;}


Pascal for i := 0 to 100 do begin if i = 50 then Break; end;

C++ for( i = 0; i

KylixQt

access to all Qt Widget public Events and PropertiesLibc

access to all libc functions

KylixGUI ApplicationsDatabase ApplicationsConsole ApplicationsWeb Server Applications

KylixLinux Multiprocessing apps

separate memory, communicate via file systemLinux Multithreading apps

same memory, share resourcesTThread base class

KylixGUI 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 lineForm1.Canvas.LineTo(60, 20); // draw lineForm1.Canvas.Font.Name := Arial;Form1.Canvas.Font.Size := 24;Form1.Canvas.TextOut(30,1, Hello World); // write text

KylixDatabase Applications

db : TClientDataSetdb.FileName := /xxx/nnn/yyy;db.Open;db.Locate(EmpNum, 124433, []);mystring := db.FieldValues[LastName];


db : TSQLDataSetdb.CommandText := select * from .;db.Open;


data aware controlsautomatically fill in data value from databaseautomatically update data value to databasecontrols can be Active while building form

KylixWeb Applications

- raw CGI or

- TWebApplication | TCGIApplication

KylixKylix 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 objectsKylix Professional - Database objectsKylix Open Edition Build open source apps licensed under GNU General Public License

KylixTechnical Requirements Kylix 2

Pentium 400 Mhz ( I am using 366 Mhz)128MB RAM ( I am using 192MB)175MB disk spaceRed Hat 6.2 or higher (I am using 7.2, Kernel 2.4.7)SuSE 7.0 or higher

KylixKylix Download

http://www.borland.com/products/downloads/download_kylix.html#Kylix 3 currently availableKylix 2 ??

KylixFreeCLX Project

Open Source CLX Class Libraryavailable at SourceForge.netincludes BaseCLX, VisualCLX, and DataCLX classes (brings full functionality to Kylix Open Edition ?)lack of detailed information on FreeCLX

KylixBibliography

Visual Basic Bible, Smith, Whistler, & MarquisDelphi in a Nutshell, Ray Lischer, OReillyLinux Programming Unleashed, Kurt Wall, SAMSObject Pascal Language Guide, Borland Delphi 3 DocumentationTeach Yourself Delphi in 21 Days, Osier, Grobman, & Batson, SAMSKylix: The Professional Developers Guide and Reference, Jon Shemitz, ApressMastering Kylix 2, Cantu & Barbini, SYBEXBorland Kylix Developers Guide, Calvert, Calvert, Kaster, & Swart, SAMSIn the Trenches, by Dale Fuller, LINUX Magazine, January 2002Product Review of Kylix 2, LINUX Magazine, May 2002Kylix vs. gcc Development http://community.borland.com/article/0,1410,28555,00.htmlTechnical Overview of the Kylix Compiler http://community.borland.com/article/0,1410,28561,00.htmlApache 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.htmlKylix newsgroup borland.public.kylix,non-technical

Kylixproduct demo

linux gui development

Documents

visual c qt

objective c

c buildermfc

c bldr

delphi oo pascal

borlandborlands turbo

codekylixport of delphi

linuxport of delphi