Re: [wxperl-users] scrolled window

[Joe Y. <jyo...@jo...>]

Here is a snip straight from the manual on Sizers and ScrolledWindows:

wxScrolledWindow
The wxScrolledWindow class manages scrolling for its client area,
transforming the coordinates according to the scrollbar positions, and
setting the scroll positions, thumb sizes and ranges according to the area
in view.
Starting from version 2.4 of wxWindows, there are several ways to use a
wxScrolledWindow. In particular, there are now three ways to set the size of
the scrolling area:
One way is to set the scrollbars directly using a call to
wxScrolledWindow::SetScrollbars. This is the way it used to be in any
previous version of wxWindows and it will be kept for backwards
compatibility.
An additional method of manual control, which requires a little less
computation of your own, is to set the total size of the scrolling area by
calling either wxWindow::SetVirtualSize, or wxWindow::FitInside, and setting
the scrolling increments for it by calling wxScrolledWindow::SetScrollRate.
Scrolling in some orientation is enabled by setting a non zero increment for
it.
The most automatic and newest way is to simply let sizers determine the
scrolling area. This is now the default when you set an interior sizer into
a wxScrolledWindow with wxWindow::SetSizer. The scrolling area will be set
to the size requested by the sizer and the scrollbars will be assigned for
each orientation according to the need for them and the scrolling increment
set by wxScrolledWindow::SetScrollRate. As above, scrolling is only enabled
in orientations with a non-zero increment. You can influence the minimum
size of the scrolled area controlled by a sizer by calling
wxWindow::SetVirtualSizeHints. (calling wxScrolledWindow::SetScrollbars has
analogous effects in wxWindows 2.4 -- in later versions it may not continue
to override the sizer)
Note: if Maximum size hints are still supported by SetVirtualSizeHints, use
them at your own dire risk. They may or may not have been removed for 2.4,
but it really only makes sense to set minimum size hints here. We should
probably replace SetVirtualSizeHints with SetMinVirtualSize or similar and
remove it entirely in future.
As with all windows, an application can draw onto a wxScrolledWindow using a
device context.
You have the option of handling the OnPaint handler or overriding the OnDraw
function, which is passed a pre-scrolled device context (prepared by
PrepareDC).
If you don't wish to calculate your own scrolling, you must call PrepareDC
when not drawing from within OnDraw, to set the device origin for the device
context according to the current scroll position.
A wxScrolledWindow will normally scroll itself and therefore its child
windows as well. It might however be desired to scroll a different window
than itself: e.g. when designing a spreadsheet, you will normally only have
to scroll the (usually white) cell area, whereas the (usually grey) label
area will scroll very differently. For this special purpose, you can call
SetTargetWindow which means that pressing the scrollbars will scroll a
different window.
Note that the underlying system knows nothing about scrolling coordinates,
so that all system functions (mouse events, expose events, refresh calls
etc) as well as the position of subwindows are relative to the "physical"
origin of the scrolled window. If the user insert a child window at position
(10,10) and scrolls the window down 100 pixels (moving the child window out
of the visible area), the child window will report a position of (10,-90).

I highly suggest downloading the documentation from:
http://prdownloads.sourceforge.net/wxperl/wxPerl-0.17-wx-2.4.0-docs-chm.chm?
download



----- Original Message -----
From: "Bungsuputra Linan" <bl...@jo...>
To: "'Joe Youngquist'" <jyo...@jo...>;
<wxp...@li...>
Sent: Thursday, September 11, 2003 8:20 PM
Subject: RE: [wxperl-users] scrolled window


> Hello Joe Youngquist,
>
> Thank you so much for replying my basic question and showing me an
> example code. I appreciate it.
>
> I learn from your example and tried it in my application and it works.
> Thank you :)
>
> However, it seems like I cannot use Wx::BoxSizer inside the scrolled
> window. So, I use coordinates to put the text controls. Beside that,
> everything works fine and I get what I want. Thank you.
>
> Regards,
> Bungsu
>
>
>