Intro to gui, cross platform and qt

Intro to gui, cross platform and qt

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  Introduction to GUI,Cross- platform and Qt By: Muhammad Sabry Contacts: muhammadsabry1st@gmail.com
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  What does Cross-platformmean?  From software perspective, it is the development of software that is said to be platform-independent. For a piece of software to be considered cross-platform, it must be able to function on more than one computer architecture or operating system  Platform: refers to the hardware or the operating system or a combination of both.
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  Cross-Platform Software Types: Cross-platform software may be divided into two types: - - one requires individual building or compilation for each platform that it supports. - The other one can be directly run on any platform without special preparation, e.g., software written in an interpreted language.
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  Challenges to cross-platform: Testing cross-platform applications may be considerably more complicated.  Different platforms often have different user interface conventions  Scripting languages and virtual machines must be translated into native executable code each time the application is executed, imposing a performance penalty
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  Introduction to GUIprogramming:  GUI (gooey) : allow the users to interact with devices through Graphics opposed to the old text-based interface or CLI.  GUI Elements : Windows, Buttons, Menus, Text fields, scroll bars, etc… which is so called widgets. Widgets can contain other widgets.  What is a widget? A widget is a visual element in a user interface.  GUI Library consist of: Most GUI library is a set of Classes to the different element we interact with, data structure, database, networking, etc…  C++ GUI Libraries: wxWidget, GTK+, Qt, MFC.
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  Three main partof any GUI program:  Graphical component.  Event handlers (e.g., in Qt they called slots).  Application methods or functions.
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  Event driven programming: When you perform an action on a graphical component you generate an event. In event-driven programming the program responds to these events. The order of the events is determined by the user, not the program.
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  Some Development Terminologies IDE: (integrated development environment) a text editor with additional support (e.g., Designer, Resource editor) compiling and debugging applications. e.g., Visual Studio.  Library: is a chunk of code (Classes and functions) that you can call from your own code, to help you do things more quickly/easily. e.g., Boost Library.  API (application programming interface) is a term means the functions in a library that you can call to ask it to do things for you - the interface to the library.  SDK (software development kit) is a library (often with extra tool Debugger, emulator, documentation, sample code, and tutorials.) that aid you in developing code that uses a particular system (e.g. extension code for using features of an operating system (Windows SDK), drawing 3D graphics via a particular system (DirectX SDK)
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  Terminologies continues..  Toolkit:is like an SDK - it's a group of tools (and often code libraries) that you can use to make it easier to access a device or system.  A framework is a big library that provides most (if not all) of the services you need to write a vast range of applications.  Basically, all the control flow is already in the framework, and there's just a bunch of predefined white spots that you can fill out with your code. A library on the other hand is a collection of functionality that you can call.
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  Introduction to Qt: Qt is a cross-platform application and UI framework for developers using C++ or QML.  Qt Creator is the supporting Qt IDE.  Qt is used mainly for developing application software with graphical user interfaces (GUIs); however, programs without a GUI can be developed.  Qt uses standard C++ with extensions  Qt supports many compilers, including the GCC C++ compiler and the Visual Studio suite.
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  Introduction to QtContinues: (Platforms) Platform New features Android Qt for Android,[19] formerly known as Necessitas.[20] Embedded Linux Qt for embedded platforms: personal digital assistant, smartphone, etc.[21] Integrity Qt for Integrity[22] iOS Qt for iOS platforms (iPhone, iPad)[23] OS X Qt for Apple OS X; supports applications on Cocoa[24] QNX / BlackBerry 10 Qt for QNX[25] and the QNX-based BlackBerry 10 platform.[26][27] VxWorks Qt for VxWorks.[28] Wayland Qt for Wayland.[29] Qt applications can switch between graphical backends like X and Wayland at load time with the -platform command line option.[30][31] This allows a seamless transition of Qt applications from X11 to Wayland. Windows Qt for Microsoft Windows XP, Vista, 7,[32] 8 Windows CE Qt for Windows CE 6 and Windows Embedded Compact 7.[33] Windows RT Support for WinRT-based Windows 8 apps and Windows Phone 8[34] With 5.4 minimum supported version: Windows Phone 8.1[35] X11 Qt for X Window System (GNU/Linux, FreeBSD, HP-UX, Solaris, AIX, etc.)[36]
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  Introduction to QtContinues: (License)  Qt Commercial License[4]  GPL-3.0[5]  LGPL-3.0[6][7]  LGPL-2.1[8]
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  Introduction to QtContinues: (Languages) Language Name: description of binding License for open source applications License for proprietary applications Ada Qt5Ada LGPL LGPL or Commercial proprie tary[1] C++ Qt – built-in[2] GPL or LGPL LGPL or Commercial proprie tary[1] Go Go QML – (blog) LGPL LGPL Haskell HsQML BSD BSD JavaScript QtQuick – built into Qt[3] LGPL LGPL or Commercial proprie tary[1] Python PyQt[4] GPL Commercial proprietary Python PyOtherSide – only for QML Free Free QML QtQuick – built into Qt[5] LGPL LGPL or Commercial proprie tary[1] Ruby ruby-qml – only for QML MIT MIT Language Name: description of binding License for open source applications License for proprietary applications Qt 5 language bindings
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  Introduction to QtContinues: (Editions)  Community.  Indie Mobile.  Professional and Enterprise.
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  Introduction to QtContinues: (History)  Trolltech (1991–2008)  Nokia (2008–2011)  Digia (2012–2014)  Qt Company (2014-present)  Qt Project (2011–present)