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Resolving QListView Not Showing Data in Model

Learn how to fix the issue of `QListView` not displaying the data from your model in Qt applications. Follow our step-by-step guide for a seamless solution! --- This video is based on the question https://stackoverflow.com/q/69176650/ asked by the user 'siya' ( https://stackoverflow.com/u/13865861/ ) and on the answer https://stackoverflow.com/a/69176974/ provided by the user 'siya' ( https://stackoverflow.com/u/13865861/ ) 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: QListView not showing data in model 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. --- Resolving QListView Not Showing Data in Model: A Quick Guide When building applications using the Qt framework, developers often encounter issues with UI components not displaying expected data. One common issue is finding that a QListView fails to show items from a model. If you've stumbled upon this problem, you're not alone. Let's explore why this happens and how to effectively resolve it. Understanding the Problem A QListView is designed to display data provided by a model. In many cases, the issue arises when the model is not set up correctly or not managed properly in memory. In particular, the use of stack-allocated objects can lead to scenarios where the data isn't retained as expected, leaving you with an empty view. In the original code snippet: [[See Video to Reveal this Text or Code Snippet]] The QStandardItemModel is allocated on the stack. This can cause problems because when the surrounding function exits, the model goes out of scope, rendering the list view unable to access data. Step-by-Step Solution To fix this, the model should be allocated on the heap. Here’s how to adjust the code: 1. Change the Model Allocation Instead of creating a model on the stack, allocate it from the heap: [[See Video to Reveal this Text or Code Snippet]] 2. Populate the Model Next, add items to the model just like before, ensuring data is properly associated: [[See Video to Reveal this Text or Code Snippet]] 3. Configure the List View Set up the view's properties and bind it to the model: [[See Video to Reveal this Text or Code Snippet]] Summary By ensuring that the QStandardItemModel is allocated on the heap using new, you maintain its data integrity even as the scope of the function changes. This simple modification resolves the issue of a QListView not displaying its model data as expected. Don't let these small pitfalls hinder your progress in working with Qt! With the right allocation, your QListView will showcase its model data beautifully. For more coding tips and solutions, stay tuned to our blog!