How to Create a Custom Scrollbar in UWP скачать в хорошем качестве

How to Create a Custom Scrollbar in UWP

Learn how to create a custom scrollbar in UWP with precise calculations for thumb width and position to enhance user experience. --- This video is based on the question https://stackoverflow.com/q/71028653/ asked by the user 'PremKumar Shanmugam' ( https://stackoverflow.com/u/13037052/ ) and on the answer https://stackoverflow.com/a/71030704/ provided by the user 'Nico Zhu' ( https://stackoverflow.com/u/7254781/ ) 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: How to Create a Custom Scrollbar in UWP? 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 Create a Custom Scrollbar in UWP Creating a visually appealing and functional scrollbar in a Universal Windows Platform (UWP) application can sometimes present challenges, especially when it comes to calculating the appropriate thumb width and position. If you've tried creating a custom scrollbar but find that the thumb does not reach the end of the track when you scroll completely, don't worry! In this post, we will break down the steps to effectively create a custom scrollbar in UWP. Understanding the Problem When implementing a custom scrollbar, you need to ensure that: The thumb width correctly reflects the ratio of the visible content to the total content. The thumb position accurately corresponds to where the user is currently viewing in the scrollable content. You’ve shared your initial efforts with the following calculations: [[See Video to Reveal this Text or Code Snippet]] Here, you have defined: VisibleLength: The width of the viewable area TotalLength: The total width of the content ScrollRegionWidth: The width of the scrollbar region minus any arrow width ScrollLeft: The amount of content that has been scrolled Though your calculations for thumb width are on the right track, the thumb position needs to be adjusted. Let's delve into how this works. Calculating the Thumb Width Correct Calculation of Thumb Width The thumb width calculation is correct: [[See Video to Reveal this Text or Code Snippet]] To confirm this, test with the scenario where VisibleLength is equal to TotalLength. In this case, the ThumbWidth will fill the entire ScrollRegion, as expected. Adjusting the Thumb Position Correct Calculation of Thumb Position The issue arises in the calculation of the thumb position. The current approach does not account for the thumb width itself, resulting in incorrect positioning. Instead, you should adjust the formula as follows: [[See Video to Reveal this Text or Code Snippet]] Why This Matters By using the modified calculation, you ensure that: The thumb starts from the left-top corner of the scroll region. It accurately reflects the content that has been scrolled and allows the thumb to reach the end of the scrollbar when the entire content is scrolled through. Conclusion Creating a custom scrollbar in UWP can significantly enhance the user interface of your application, but ensuring that the thumb width and position are calculated correctly is crucial for functionality. By adhering to the correct formulas discussed: Thumb Width: ThumbWidth = (VisibleLength / TotalLength) * ScrollRegionWidth Thumb Position: ThumbPosition = (ScrollLeft / TotalLength) * (ScrollRegionWidth - ThumbWidth) You’ll be able to develop a seamless user experience where the scrollbar behaves as expected. Now you’re equipped with the essential logic to implement a robust and custom scrollbar in your UWP applications. Happy coding!