CODEWITHSUNDEEP
c#wpfscrollscrollviewer
botangolan
botangolan

Reputation: 331

WPF ScrollViewer's ViewportWidth is not updating

I have a scrollviewer that I want to scroll to the right when the edge is reached. I am detecting the mouse position and comparing it to the scrollviewer's ViewportWidth. It works at first, when dragging to the edge it will scroll. However, once I let go, and try again, or if I hold on to the mouse and move back into the scrollviewer, it will keep going.

What I've noticed is that whatever width it is at initially (the first time I reach the edge), it seems to think that the ViewportWidth is still the same, even if I have scrolled. So it will scroll no matter what once it reaches that specific width.

Is there a way I can get ViewportWidth to update each time I scroll? I tried putting UpdateLayout in the function after changing the offset but it did not work. The goal here is so that the width updates continually, so that I can check if the edge of the viewport has changed.

Upvotes: 0

Views: 1371

Answers (1)

botangolan
botangolan

Reputation: 331

Solved my issue by combining ViewportWidth with HorizontalOffset. Adding them, then comparing pt.X to it gave me the exact area between the Viewport and the overflow, allowing me to scroll.

Upvotes: 1

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