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** [bugs:#1238] scrollbars overlap canvas when patch is first opened**
**Status:** open
**Group:** v0.46
**Created:** Sun Apr 24, 2016 09:46 AM UTC by danomatika
**Last Updated:** Sun Apr 24, 2016 09:46 AM UTC
**Owner:** nobody
**Attachments:**
- [test2.pd](https://sourceforge.net/p/pure-data/bugs/1238/attachment/test2.pd)
(137 Bytes; application/octet-stream)
Mac OSX 10.11.4, testing with Pd 0.46-4 & 0.47-0
I finally tracked down something that has annoyed me for a long time: when
opening a patch, the canvas scrollbars will overlap objects on the bottom or
right edge of the canvas window no matter how precise my alignment when I save
the patch. Similarly, when you resize the canvas to something greater than the
saved size, the scrollbars do not hide.
I poked around in pdtk_canvas.tcl and it looks like pdtk_canvas_getscroll is
being called before the window has actually been sized. This means the initial
call to show/hide the scrollbars uses a canvas window size of 1x1, so the
scrollregion math results in a tiny scroll region and the scrollbars are always
shown.
I put in some prints and get roughly the following when first opening the
attached test.pd patch:
~~~~
window size: 1 1
canvas size: 462 304
xview: 0.0 0.0021645021645021645
yview: 0.0 0.003289473684210526
~~~~
A crude fix for testing is to basically filter out ridiculously tiny range
values on lines 322:
~~~
if {[lindex [$tkcanvas xview] 0] == 0.0 && ([lindex [$tkcanvas xview] 1] == 1.0
|| [lindex [$tkcanvas xview] 1] < 0.01)} {
~~~
and similarly with the yscrollbar on line 334, although this will fail with
some window & canvas sizes so it's not the ideal fixes. I found this while
paying with the attached test2.pd which shuld always open with scrollbars size
the object is hidden to the lower right as the window size is smaller than the
canvas size.
It seems to me like g_canvas should wait until the window exists *and* has been
sized before doin it's initial call to pdtk_canvas_getscroll.
---
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