Qt6 and QML Intermediate: Interfacing to C++

Learn how to interface c++ types with qml, create and expose objects across sides, and use the q property mechanism and context properties to propagate changes, call javascript from c++.

Learn how to connect Qt C++ and QML using context properties, expose a C++ class to QML, and call invokable methods or slots from QML buttons.

Learn how the QML connections type intercepts signals with a target property, letting green and blue rectangles respond to red rectangle clicks.

Expose a C++ signal sender to QML, use a connections element to handle on call QML and on CP timer signals, and update the rect text with a one-second timer.

Expose C++ properties to QML using Q_PROPERTY macros, a movie class with main character and title, with getters, setters, and change signals, exposed as a context property for QML updates.

Explain context objects and how they expose C++ data directly to QML via root context. Compare with context properties and a live last name and first name demo.

Demonstrates calling JavaScript functions embedded in QML from C++, using Qt's invoke method on a root object via QMetaObject, passing parameters and capturing the return value with QVariant.

Expose a C++ class as an instantiable type in QML by creating objects on the QML side, via the QML element macro or QML register type.

Expose a movie type as a qml module by creating a movies subdirectory with its own cmake list, building the module, and linking it for import.

Discover how to create a single instance in Qt6 and QML by exposing a C++ class as a singleton, using QML element and QML singleton, or via register singleton instance.

Learn how to interface C++ and QML using context properties, signals, and the Q property mechanism; expose types to QML with register type or singleton options, enabling seamless updates.

Explore data conversions between C++ and QML, exchanging basic types, date time, and sequences such as vectors and lists, and use variant list and variant map for key-value data.

Explore how C++ data types convert to QML when exchanged, and build a CP class that sends and receives ints, bools, doubles, and strings via signals and slots.

Explore how to exchange date and time data between C++ and QML in Qt6, using signals, slots, and QML elements to send and receive DateTime and Time objects.

Explore exchanging sequence data between C++ and QML in Qt6, converting between QVector or QList and JavaScript arrays, using an exposed C++ class and buttons to send and receive arrays.

Learn how to transfer data between C++ and QML using QVariantList and QVariantMap, with automatic conversion to JavaScript arrays and objects, including two-way calls via invokable methods.

Exchange data between C++ and QML using signals that carry booleans, doubles, strings, colors, and date-time values, with lists converting to JavaScript arrays and maps to objects.

Learn to build a rest client with qnetworkaccessmanager, expose C++ rest data to qml, and leverage Qt 6.7 rest facilities to source data as a qml-ready type.

Build a rest client in C++ with QNetworkAccessManager to download json data from an http server and feed it into a QML model for display in a list view.

Qt 6.7 updates: rest friendly types, QRestAccessManager, and QNetworkRequestFactory to simplify rest calls with base URLs, endpoints, and JSON processing for QML models.

Expose a C++ instantiable type to QML and bind a posts list to the QML model. Implement fetch posts and remove last to trigger automatic list updates via signals.

Explore rest facilities sending data from c++ to qml using the network access manager, network reply, and a chunked buffer to assemble a json document.

Expose non-visual C++ types to QML, forward data with a counter, and apply enums, object list properties, grouped properties, and attached properties to model a football team with players.

Build a non-visual counter in C++ and expose it to QML. As an instantiable QML element, start and stop control counting, updating a rectangle display.

Expose c++ enums to qml by declaring a qobject class with a public enum and registering it as a qml creatable type; access enum values in qml.

Expose a count direction enum (up or down) from C++ to QML via a QML element macro, creating a creatable counter that increments or decrements according to the enum value.

Expose a list of players to QML via a QML list property in Qt6, modeling players and a football team in C++, with append, count, and clear callbacks.

Explore object-oriented design in Qt6 and QML by modeling players through inheritance: define a pure virtual player interface, implement striker and defender with distinct play methods, usable from QML.

Learn how default properties work in QML, using a macro to map root scope items to the players property, with defender, striker, and players as examples.

Explore grouped properties in Qt6 QML by implementing a player details class that wraps height, weight, and speed, exposing them through a grouped property in the player.

Learn to implement attached properties in QML by building a timer attached to a custom type, including the attached class, attaching class, properties, signals, and using it in QML.

Learn to create a custom property value source in Qt6 and QML that feeds width or radius with a timer-driven random number, using set target and update property.

Expose c++ types to qml with a custom counter and enums, enabling data display in qml. Enable list, grouped, and attached properties, with value sources like random number on width.

Harness C++ as the heavy lifter and interface with QML through context properties, context objects, and instantiable types, plus QML registration and property inspection from C++.