How to Change Data in QTreeView Using PyQt5 скачать в хорошем качестве

How to Change Data in QTreeView Using PyQt5

Discover how to efficiently modify items in a QTreeView with PyQt5 without slowing down your application. --- This video is based on the question https://stackoverflow.com/q/62598469/ asked by the user 'PrimeNumbers' ( https://stackoverflow.com/u/13819978/ ) and on the answer https://stackoverflow.com/a/62599423/ provided by the user 'eyllanesc' ( https://stackoverflow.com/u/6622587/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Change certain data in QTreeView Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- How to Change Data in QTreeView Using PyQt5 Creating a virtual file system for your application can be both an exciting and challenging task. If you're using PyQt5's QTreeView to visualize your data, you might find yourself facing the issue of modifying the nodes dynamically without loss of performance. In this guide, we will walk through how to achieve this, allowing your application to remain responsive even with a large dataset. Understanding the Problem When building a virtual file system, it’s common to want to offer users options such as renaming or moving files. While updating the underlying XML data can be straightforward, effectively syncing those changes with the QTreeView display can often be a source of frustration. You might consider regenerating your entire model from the XML, but that quickly becomes inefficient, especially if you have a few thousand entries. It collapses all the nodes, which also interferes with user experience. Goals The objective is to allow users to select an element in the tree and rename it efficiently: Retrieve the selected item. Locate the corresponding model item. Update the display without refreshing the entire structure. Solution Breakdown Instead of regenerating the entire model, we can simply update the existing tree's nodes directly. Let's go over the steps. Step 1: Connect the Click Signal The clicked signal provides us a QModelIndex of the selected item. This eliminates the need to use selectedIndexes() and makes our code cleaner. [[See Video to Reveal this Text or Code Snippet]] Step 2: Access the Model Using the provided index, you can access the associated model. This model contains all the data displayed in the QTreeView. [[See Video to Reveal this Text or Code Snippet]] Step 3: Modify the Selected Item Now that we have the model and the index for the selected item, we can retrieve that item and change its properties. We'll use the setText method to modify the displayed text. [[See Video to Reveal this Text or Code Snippet]] Alternatively, you can use the setData method to update the data associated with the item. [[See Video to Reveal this Text or Code Snippet]] Complete Code Example Here’s the complete implementation of the above logic in a simple PyQt5 application: [[See Video to Reveal this Text or Code Snippet]] Conclusion By directly accessing and updating the model using the clicked signal in QTreeView, you can efficiently manage changes without the performance overhead of regenerating the model. This approach keeps your application sleek and user-friendly, even when dealing with large amounts of data. Feel free to adapt this solution to suit your needs and continue exploring the possibilities within PyQt5. Happy coding!