Скачать или смотреть How to Automatically Scroll to the End of Text Boxes in WPF Applications

Learn how to automatically scroll both input and output text boxes to the end when text changes in a WPF application. This guide provides a streamlined solution to improve user experience.
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This video is based on the question https://stackoverflow.com/q/67673278/ asked by the user 'DeadlyHigh' ( https://stackoverflow.com/u/11774653/ ) and on the answer https://stackoverflow.com/a/67674000/ provided by the user 'mm8' ( https://stackoverflow.com/u/7252182/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Automatically Scroll to the End of Text Boxes in WPF Applications

When developing Windows Presentation Foundation (WPF) applications, you might encounter a common issue where text boxes do not automatically scroll to the bottom when new text is added. This can be particularly frustrating for users who are working with long strings, such as file paths or lengthy input values. In this guide, we will explore a streamlined solution to ensure that your WPF application's text boxes always display the latest text by scrolling to the end automatically.

The Problem

In a scenario where you have two text boxes – one for input and the other for output – it's important that both scroll to the end whenever new text is added. Many developers face this issue when they try to handle the text change events. The problem arises because, often, only the last modified text box scrolls to the end, leaving the other input or output text boxes behind.

The Solution: Implementing the TextChanged Event

To solve this problem, you can use the built-in TextChanged event of the text boxes. By handling this event, you can ensure that whenever the text changes, both text boxes scroll to the end automatically. Here’s how you can implement it:

Step 1: XAML Setup

Ensure that you have your text boxes defined in your XAML code. Here's an example of how your text boxes might look:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Subscribe to the TextChanged Event

Next, you will need to subscribe to the TextChanged event for both text boxes in the code-behind file. You can use the following code snippet:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of the Code

OnTextChanged Method: This method gets triggered whenever the content of either text box changes. It takes the sender (the text box that triggered the event) as a parameter and uses it to scroll to the right position.

ScrollToHorizontalOffset: This function is critical as it adjusts the horizontal scroll position to ensure that the caret (cursor) is visible at the right end of the text.

Event Subscription: By subscribing both InputTextBlock and OutputTextBlock to the OnTextChanged event, you ensure that any change in either text box causes both to scroll correctly.

Conclusion

By employing the TextChanged event, you are able to enhance the user experience of your WPF applications significantly. Users will appreciate the seamless experience of seeing the most current text without having to manually scroll. Next time you're faced with the problem of text boxes not scrolling automatically, remember this simple solution!

Feel free to try it out in your applications, and watch how easy it becomes to handle lengthy file paths or input content!

If you found this guide helpful, don't hesitate to share it with fellow developers facing similar challenges, and keep coding!