Creating a Single Qt QML Module with Distinct URIs

Описание: Learn how to manage multiple URIs in a Qt QML module by using a single meta project while navigating the limitations of Qt's module structure.
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This video is based on the question https://stackoverflow.com/q/77767459/ asked by the user 'Malachi' ( https://stackoverflow.com/u/287545/ ) and on the answer https://stackoverflow.com/a/77795333/ provided by the user 'Malachi' ( https://stackoverflow.com/u/287545/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating a Single Qt QML Module with Distinct URIs

Are you looking to enhance your Qt QML application by structuring it into multiple URIs within a single module? This is a common question among developers, and while the immediate technical answer might seem to suggest that it's not possible, there are clever workarounds to achieve your goals. Let’s dive into the details and explore how you can manage multiple URIs in your QML structures.

The Problem: Multiple URIs in a Single Module

In Qt QML, modules are typically defined with a single uniform URI. You might want to structure your QML code in a way that allows various components to reside under different URIs while still being related to a single project. A typical scenario could look something like this:

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However, with the default settings in Qt, you may wonder: Is it possible to create one module that supports multiple URIs?

The Technical Answer: No

While you may desire this functionality, the direct answer according to current Qt standards is a hard no. Each QML module is required to compile with its own unique URI, which means that having multiple distinct URIs under a single module is against the framework's design principles. However, don't despair just yet!

The Functional Approach: Using a Meta Project

Even though you cannot directly create a module with multiple URIs, you can still simulate the organization of your QML files by using a 'meta project'. This allows you to structure your project in a way that feels cohesive while adhering to Qt's requirements.

Step-by-Step Solution

Here’s how you can setup a meta project in your CMakeLists.txt to achieve a similar outcome:

Define Your Project
Begin by defining the main project that will aggregate all your components:

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Add the Main QML Module
Add the primary QML module with its designated URI:

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Add an Additional QML Module
Next, you can define another QML module which will be associated with a different URI:

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Link the Libraries
Finally, ensure the libraries are appropriately linked:

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Points to Remember

Each qt_add_qml_module function creates a separate module as per the requirements of Qt.

By using this method, you effectively group related QML files and allow for a cleaner and more organized structure, resembling a single library.

This workaround maintains the modularity of your components while providing a way to access them under different URIs.

Conclusion

Although Qt does not allow for the creation of a single module featuring multiple distinct URIs directly, applying the concept of a meta project gives you a functional way to work around these limitations. By properly structuring your CMakeLists.txt, you can achieve an organized and efficient application that maintains clarity and functionality. Now you can proceed with managing your QML modules more effectively, improving both development speed and code maintainability.

Feel free to reach out with any further questions or for tips on maximizing your Qt QML development experience!