Hi,
wx.Window has methods to scroll vertically (ScrollLines,
ScrollPages, etc.) but what if I want to scroll it horizontally? Do I
have to use wx.Window.ScrollWindow (and in pixels)?
I'm still confused about the real differences between normal
descents of wx.Window and wx.ScrolledWindow. Is there any situation
when I have to use the latter? Plus, I'd appreciate if people can give
me some help on the relationship between scrollbars/client
area/size/virtual size...
Happy New Year!
Cheers,
Pan Xingzhi
Robin,
Nice to hear from you again in 2008. Thank you for the direction.
I kept asking questions about scrolling because I feel that
scrolling in wxPython is a little bit weird, but to accomplish my task
I have to thoroughly understand what's going on. There is something
unusual but I couldn't tell, until I took some time to think about it,
inside and out. Then I realized that in wxPython, both containers and
non-containers can have scrolling ability (though it seems that
wxPython do not emphasize the difference between the two). So my
questions came again. I put my understandings below, please correct me
if I'm wrong:
1. For non-container widgets like wx.TreeCtrl, by default,
scrollbars show up when the virtual size gets larger than the client
size.
2. The virtual size of non-containers is decided by the content of
the non-container widget, e.g., the text in the TextCtrl, items in a
TreeCtrl.
3. For containers, the virtual size is calculated from the size
(*not* virtual size) and position of its children (suppose we don't
use sizers).
4. The condition for scrollbars of containers to show up is the
same as non-containers.
Btw, you guys really should rename wx.ScrolledWindow to
ScrolledPanel or something. After all it's a container. A beginner
would easily think ScrolledWIndow as a direct child of wx.Window.
(However I found a wx.lib.scrolledpanel.ScrolledPanel already occupied
the name.)
Cheers,
Pan Xingzhi
···
2008/1/1, Robin Dunn <robin@alldunn.com>:
Pan Xingzhi wrote:
> Hi,
>
> wx.Window has methods to scroll vertically (ScrollLines,
> ScrollPages, etc.) but what if I want to scroll it horizontally? Do I
> have to use wx.Window.ScrollWindow (and in pixels)?
Yes, but it's easy to determine how many pixels there are in the
horizontal equivalent to line or page, (based on whatever you set the
scroll units to be) and I think you'll also need to update the scrollbar
yourself as ScrollWindow just moves the pixels.
>
> I'm still confused about the real differences between normal
> descents of wx.Window and wx.ScrolledWindow. Is there any situation
> when I have to use the latter?
wx.ScrolledWindow automates most of the ugly details of supporting a
scrollable panel. That includes dealing with the virtual size vs.
client size, positioning scroll bars, offsetting the drawing to the
logical position, repositioning child widgets, etc. etc. About the only
time you would want to deal with scrolling without a wx.ScrolledWindow
is when you want more flexibility than what wx.ScrolledWindow can give
you, which hasn't been very often in my experience.
> Plus, I'd appreciate if people can give
> me some help on the relationship between scrollbars/client
> area/size/virtual size...
WindowSizeInfo - wxPyWiki
--
Robin Dunn
Software Craftsman
http://wxPython.org Java give you jitters? Relax with wxPython!
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