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Implementing Non-Selectable TableRow in a JavaFX TableView

Learn how to effectively manage row selection in JavaFX TableView by disabling certain TableRow items based on custom conditions. --- This video is based on the question https://stackoverflow.com/q/38192946/ asked by the user 'Chiggiddi' ( https://stackoverflow.com/u/6364691/ ) and on the answer https://stackoverflow.com/a/66389328/ provided by the user 'Ragunath Jawahar' ( https://stackoverflow.com/u/421372/ ) 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: Disable Selection of certain TableRow items within TableView in JavaFX 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 3.0' ( 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. --- Implementing Non-Selectable TableRow in a JavaFX TableView When working with JavaFX, you may encounter a scenario where you need specific rows in a TableView to be non-selectable based on certain conditions. This is particularly useful when you want to prevent interaction with rows that shouldn't be selectable, such as ages above 18 in a list of Person objects. In this post, we will go through a structured solution to disable selection of certain TableRow items while still allowing for navigation using the keyboard. The Problem In a typical TableView, all rows are selectable by default. However, in a case where certain rows represent data that shouldn't be acted upon, you might want those rows to be non-selectable. For example: Suppose you have a TableView containing Person objects. You want rows representing individuals older than 18 years to be rendered as non-selectable. Example Scenario Row 1: Age 17 - Selectable Row 2: Age 19 - Non-selectable Row 3: Age 16 - Selectable When the user navigates through the TableView, any non-selectable rows should be skipped. In this case, if a user is currently focused on Row 1 and presses the down arrow key, the selection should move directly to Row 3, skipping Row 2. Our Approach To implement this functionality, we can use the following steps with a custom RowFactory for the TableView. Here's how you can set it up: [[See Video to Reveal this Text or Code Snippet]] Explanation of the Code Row Factory: We're setting a custom factory for creating TableRow objects. Update Item Method: Inside this method, we check if the row’s item is null or empty. If it contains a Lineitem, we add a listener to its item property. Condition Check: If the person’s age is above 18 (isOlderThan18()), we disable the row using setDisable(true). Otherwise, we enable it (setDisable(false)). The Challenge While the previously mentioned code effectively disables the visual selection of rows, it does not prevent keyboard navigation to those rows. Although we can disable these rows, we may still find ourselves able to select these non-selectable rows using the up and down arrow keys based on JavaFX’s default behavior. A Workaround Solution To address this issue, we can implement a custom selection mechanism. Here’s a simple function to navigate while skipping non-selectable rows: [[See Video to Reveal this Text or Code Snippet]] How It Works This method takes in the indices of the previously selected row and the currently selected row. It determines whether to skip over non-selectable rows based on the indices. Depending on the current selection, it will navigate to the next available selectable row. Conclusion Implementing a TableView that allows for non-selectable rows based on conditions enhances user experience by guiding users away from invalid selections. By combining JavaFX’s RowFactory with a custom selection model, you can maintain a fluid navigation experience while ensuring data integrity. With these adjustments, your TableView will behave exactly as required: skipping non-selectable rows during navigation, making for a cleaner and more intuitive application. Feel free to reach out if you have any questions or need further clarifications on implementing this solution in your JavaFX application!