I have an application where I load a file and display its contents in hexadecimal. I display the bytes in a ScrolledWindow. I’ve gotten it to load everything up. The only issue is that the contents of the window are not visible until a scroll event. I’ve created (what I think is) a minimal example.
Anybody have any ideas why this is happening? How to get around it?
ScrollTest.py (3.6 KB)
When I ran the code you uploaded the frame was empty. This was because the button was not added to bsizer and bsizer was not added to sizer.
After I fixed that, the button did appear and when I clicked on it, some data values immediately appeared in the scrolled window, without needing to scroll it.
Tested using wxPython 4.2.4 gtk3 (phoenix) wxWidgets 3.2.8 + Python 3.12.3 + Linux Mint 22.3.
Forgot to mention Windows 11, 24H2.
Sounds like it might be limited to Windows. I’ll try my Linux machine to be sure.
Finally got it to work after consulting Google Gemini. Previosly, I tried Microsoft Copilot and Claude. Ended up switching to wx.lib.scrolledpanel.ScrolledPanel.
Thanks for your help.
Joe
this is usually just a repaint/layout issue with wx.ScrolledWindow.
after you populate it, make sure you’ve called:
SetScrollRate(...)Layout()FitInside() (if using sizers)Refresh() / Update()also if you’re drawing manually, set SetVirtualSize() before showing the frame.
what’s happening is nothing triggers an initial paint, and the first scroll forces one — that’s why it suddenly appears. classic Scrolled Window Behaviour.