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is a cross-platform application framework that is widely used for developing application software that can be run on various software and hardware platforms with little or no change in the underlying codebase, while still being a native application with native capabilities and speed. Qt is currently being developed both by The Qt Company, a company listed on the Nasdaq Helsinki Stock Exchange and the Qt Project under open-source governance, involving individual developers and firms working to advance Qt is available with both commercial With the release of version 2.0 of the toolkit, the license was changed to the Q Public License (QPL), a free software license, but one regarded by the Free Software Foundation as incompatible with the GPL. Compromises were sought between KDE and Trolltech whereby Qt would not be able to fall under a more restrictive license than the QPL, even if Trolltech was bought out or went bankrupt. This led to the creation of the KDE Free Qt foundation,which guarantees that Qt would fall under a BSD-style license should no free/open source version of Qt be released during 12 months
When first released, Qt used its own paint engine and controls, emulating the look of the different platforms it runs on when it drew its widgets. This made the porting work easier because very few classes in Qt depended really on the target platform; however, this occasionally led to slight discrepancies where that emulation was imperfect. Recent versions of Qt use the native style APIs of the different platforms, on platforms that have a native widget set, to query metrics and draw most controls, and do not suffer from such issues as much On some platforms (such as MeeGo and KDE) Qt is the native API. Some other portable graphical toolkits have made different design decisions; for example, wxWidgets uses the toolkits of the target platform for its implementations. Welcome to the world of Qt--the cross-platform GUI toolkit. In this getting started guide, we teach basic Qt knowledge by implementing a simple Notepad application. After reading this guide, you should be ready to delve into our overviews and API documentation, and find the information you need for the application you are developing.
In this first example, we simply create and show a text edit in a window frame on the desktop. This represents the simplest possible Qt program that has a GUI. Line 6 creates a QApplication object. This object manages application-wide resources and is necessary to run any Qt program that has a GUI. It needs argv and args because Qt accepts a few command line arguments. Line 11 makes the QApplication enter its event loop. When a Qt application is running, events are generated and sent to the widgets of the application. Examples of events are mouse presses and key strokes. When you type text in the text edit widget, it receives key pressed events and responds by drawing the text typed. Line 10 uses Qt's Signals and Slots mechanism to make the application exit when the Quit button is pushed. A slot is a function that can be invoked at runtime using its name (as a literal string). A signal is a function that when called will invoke slots registered with it; we call that to connect the slot to the signal and to emit the signal.
This tutorial will explain in detail how to take your first steps in programming with Qt using the Qt Creator integrated development environment (IDE). We will begin by creating a new Qt-based project and modifying the generated code to show a very simple graphical user interface (GUI). Once our basic application project is in place and running, we will go back and modify it to do some slightly useful things. Qt is the software development framework of choice by engineers in over 70 industries worldwide for creating, building and deploying millions of connected embedded devices and applications. They chose Qt because it’s intuitive, cross-platform and saves time. When you develop with Qt, you create more, code less and deploy everywhere — and ahead of the rest. Qt Linguist is a tool for adding translations to Qt applications. Run Qt Linguistfrom the taskbar menu, or by double clicking the desktop icon, or by entering the command linguist at the command line. Once Qt Linguisthas started, choose File|Open from the menu bar and select a translation source (TS file) to load. If you do not have a TS file, see the release manager manual to learn how to generate one.
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The Qt Linguist main window is divided into several, dockable subwindows arranged around a central translation area. The context list is normally shown on the left, and the source code, string list, and either the phrases and guesses, or the warnings are shown above and below the translations area. Qt Linguist can automatically check whether your translation strings pass a list of validation tests. Validation test failures are shown in the warnings window. If the warnings window is not visible, click the Warnings tab at the bottom of the main window. Qt Linguist can now load and edit multiple translation files simultaneously. One use for this is the case where you know two languages better than you know English (Polish and Japanese, say), and you are given an application's Polish translation file and asked to update the application's Japanese translation file. You are more comfortable translating Polish to Japanese than you are translating English to Japanese.
If a phrase occurs more than once in a particular context it will only be shown once in Qt Linguist's context list and the translation will be applied to every occurrence within the context. If the same phrase needs to be translated differently within the same context the programmer must provide a distinguishing comment for each of the phrases concerned. If such comments are used the duplicate phrases will appear in the context list. The programmers comments will appear in the translation area on a light blue background. Ideally Ctrl key accelerators are translated simply by copying them directly using Copy from source text in the Translation menu. However, in some cases the character will not make sense in the target language, and it must be changed. Whichever character (alpha or digit) is chosen, the translation must be in the form "Ctrl+" followed by the upper case character. Qt will automatically display the correct name at run-time. As with Alt key accelerators, if the translator changes the character, the new character must not conflict with any other Ctrl key accelerator.
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