Qt Fundamentals
Qt is a cross-platform application framework. It supplies user-interface toolkits, an event-driven object model, platform abstractions, and tools so one application can target desktop, mobile, and embedded systems.
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Intro
Qt Fundamentals
Qt is a cross-platform application framework centered on C++, with QML and Python workflows for building user interfaces. Its modules provide UI controls, graphics, networking, data handling, localization, accessibility, and hardware integration behind APIs that remain largely consistent across target platforms.
The application architecture
A Qt application starts an application object and enters an event loop. The operating system delivers input, window, timer, and network events. Qt translates them into events, signals, and callbacks that application objects handle. Those handlers update state. UI objects then reflect that state and Qt's rendering path presents the next frame.
QObject is the base of Qt's object model. It adds runtime metadata, properties, events, object trees, and signals and slots to C++. A signal announces that something happened. A connected slot or callable handles that notification. The sender does not need to know which receivers are connected, which reduces direct coupling between components.
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Sources
- https://doc.qt.io/qt-6/qt-intro.html
Supports
- Qt definition
- platform scope
- Qt Quick and Widgets choice
- modules
- tools
- languages
- https://doc.qt.io/qt-6/object.html
Supports
- QObject features
- meta-object system
- identity and non-copyability
- https://doc.qt.io/qt-6/objecttrees.html
Supports
- Parent-child ownership
- deletion behavior
- visual parent distinction
- https://doc.qt.io/qt-6/signalsandslots.html
Supports
- Signals
- slots
- connections
- decoupled communication
- https://doc.qt.io/qt-6/eventsandfilters.html
Supports
- Event delivery and event filters
- https://doc.qt.io/qt-6/qtquick-index.html
Supports
- Qt Quick architecture
- QML UI
- scene graph
- controls
- https://doc.qt.io/qt-6/qtqml-syntax-objectattributes.html
Supports
- QML properties
- signals
- bindings
- object attributes
- https://doc.qt.io/qt-6/qtwidgets-index.html
Supports
- Qt Widgets architecture
- desktop controls
- dialogs
- layouts
- https://doc.qt.io/qt-6/model-view-programming.html
Supports
- Models
- views
- delegates
- indexes
- change notifications
- https://doc.qt.io/qt-6/threads-qobject.html
Supports
- GUI thread
- thread affinity
- queued work
- parent-child thread constraints
- https://doc.qt.io/qt-6/qt.html#ConnectionType-enum
Supports
- Direct
- queued
- and automatic connection semantics
- https://doc.qt.io/qt-6/cmake-manual.html
Supports
- CMake as Qt 6 build system
- module and target integration
- https://doc.qt.io/qt-6/deployment.html
Supports
- Runtime libraries
- plugins
- QML imports
- target deployment
- https://doc.qt.io/qt-6/qt-releases.html
Supports
- Versioning
- compatibility conditions
- cadence
- LTS
- Qt 6 timeline
- https://www.qt.io/licensing/
Supports
- Commercial and open-source licensing choices
- https://wiki.qt.io/Qt_History
Supports
- Timeline milestones from conception through company and tooling changes
- https://www.qt.io/blog/qt-6.0-released
Supports
- Qt 6 release date and major-release transition
- https://github.com/sindresorhus/awesome
Supports
- Required Awesome discovery starting point and Qt list link
- https://github.com/JesseTG/awesome-qt
Supports
- Discovery of GammaRay
- PyQt
- Felgo
- KDE Frameworks
- Qwt
- and Qt QML Book
- https://docs.kdab.com/gammaray-manual/latest/
Supports
- Runtime QObject
- model
- and scene-graph inspection; awesome rationale
- https://riverbankcomputing.com/software/pyqt
Supports
- PyQt binding scope and licensing; awesome and landscape placement
- https://felgo.com/doc/index/
Supports
- Qt-based QML SDK
- tools
- components
- deployment; awesome rationale
- https://api.kde.org/frameworks/index.html
Supports
- Modular Qt-based libraries; awesome rationale
- https://qwt.sourceforge.io/
Supports
- Technical plotting and control widgets; awesome rationale
- https://qmlbook.github.io/
Supports
- Worked Qt Quick and QML learning path; awesome rationale
- https://www.gtk.org/
Supports
- GTK landscape placement
- https://www.wxwidgets.org/
Supports
- wxWidgets landscape placement
- https://juce.com/
Supports
- JUCE landscape placement
- https://slint.dev/
Supports
- Slint landscape placement
- https://flutter.dev/
Supports
- Flutter landscape placement
- https://avaloniaui.net/
Supports
- Avalonia landscape placement
- https://www.electronjs.org/
Supports
- Electron landscape placement
- https://www.qt.io/development/qt-framework/python-bindings
Supports
- Official PySide6 binding scope and landscape placement