Скачать или смотреть How to Populate ComboBox Items in Qt Quick from a C+ + File

Discover how to easily populate your ComboBox items in Qt Quick using a QStringList in C+ + . This step-by-step guide will simplify the process for you!
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This video is based on the question https://stackoverflow.com/q/65697655/ asked by the user 'Puneet Kumar' ( https://stackoverflow.com/u/8277365/ ) and on the answer https://stackoverflow.com/a/65800340/ provided by the user 'Kao' ( https://stackoverflow.com/u/14430081/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Populate ComboBox Items from C+ + File in Qt Quick

If you're just starting with Qt QML, you might find yourself facing some challenges, especially when it comes to populating UI components like ComboBoxes with dynamic data from C+ + . This article will guide you through the process of populating ComboBox items using a list of strings defined in a C+ + file. We’ll break this down into easy steps to help you grasp the concepts effectively.

Understanding the Problem

In your Qt Quick application, you have a ComboBox defined in a QML file (let's call it voiceCall.qml). You want to fill this ComboBox with items that are stored in a QStringList defined in your C+ + file (audioinput.cpp). Your initial setup might look a bit daunting, but we will simplify it.

Example Setup

C+ + String List

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ComboBox in QML

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Step-by-Step Solution

To achieve your goal of populating the ComboBox, follow these steps:

1. Define the QStringList in C+ +

You need to create a QStringList that holds the items you want in your ComboBox. This is typically done in your audioinput.cpp file.

Example C+ + Code

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2. Modify QML to Use the Model

In your QML file, instead of leaving the model of the ComboBox empty, link it to the comboBoxModel you've just defined in your C+ + code.

Example QML Code

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3. Additional Context on QStringList

QStringList is a Qt convenience class that inherits from QList<QString>. It’s ideal for handling lists of strings, making it perfect for populating your ComboBox.

Conclusion

Populating a ComboBox in a Qt Quick application using data from C+ + is straightforward once you understand how to link the two components together. By defining your QStringList in C+ + , exposing it to QML, and properly referencing it in your ComboBox, you can create a dynamic and user-friendly interface.

Now, you can easily add more items to your QStringList in C+ + , and they will automatically be reflected in your ComboBox without needing any additional changes in QML.

With practice, you'll become more comfortable with combining C+ + and QML in your Qt applications. Happy coding!