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POPython tk scrollbar behavior (Windows to blame?)
 

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  1. POPython tk scrollbar behavior (Windows to blame?)
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    <p>I'm coding a GUI in Python/Tkinter that includes a listbox with a scrollbar. I've gotten the scrollbar operating as expected (i.e. you can click and it scrolls up/down through the listbox contents), but something's off with the way scrollbar itself behaves. The image below should help clarify.</p> <p><img src="https://i.stack.imgur.com/xQAzM.jpg" alt="tk.Scrollbar Windows rendering"></p> <p>The listbox is sized for 8 lines and contains only 12, so first off the slider should be a lot larger (2/3 of the scrollbar length). Second, whenever I scroll down (regardless of how I do it), the slider stays 'glued' to the top of the bar. This prevents me from ever using the upward fast-scroll method where you click above the slider but below the arrow -- so upward scrolling is limited to using the arrow and going one line at a time. A downward fast-scroll works fine, although as noted the slider still stays 'glued' to the top. I can click and drag the slider down, but then it pops right back up to the top. Clicking the arrows (either up or down) works normally.</p> <p>I've tried using the alternative scrollbar in ttk, but it's not really any better:</p> <p><img src="https://i.stack.imgur.com/1rH0H.jpg" alt="ttk.Scrollbar Windows rendering"></p> <p>In this case the slider fills the entire bar and you can't fast-scroll either direction, up or down. Grab-and-drag works (somehow), the listbox scrolls but you get no visual cue as to how close you are to the top or bottom. The arrows (again) work normally.</p> <p>In short it's usable, but just very glitchy and weird. Is all this just a known limitation with using Python/Tkinter on Windows OS? (My machine has Windows XP (32-bit) with SP 3. It's Python version 2.7.3.)</p>
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    1. USJDM
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    1. COCan you show your code? (I have an idea what problem to expect in plain Tk: you have to configure both widget's -yscrollcommand and scrollbar's -command, and forgetting the former will get results similar to what you describe. Maybe it's applicable to tkinter as well)
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      1. USAnton Kovalenko
    2. COYou and Bryan Oakley both nailed it. I configured the scrollbar's -command, but not the listbox's -yscrollcommand.
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