Since I can’t horizontally scroll Treeview column due to what appears to be Tk/Tkinter limitation, I want to make it sticky so it is attached to the frame.
The issue is that user can manually resize Treeview column which can mess up my interface in a certain way. Is it possible to disable such functionality?
Note the size of the column header.
User can drag mouse to resize column. I want to disable this.
Setting minwidth to a certain value prevents column from shrinking, but it is still possible to resize it to a larger width. I suppose I can react to changing width and just revert it to original, but there has to be a better way to do it.
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Answer
The following has only been tested on Windows, other OS’s may vary.
For any future readers, since Tk 8.5, Treeviews have an identify_region method that accepts a screen position (x,y) and will return a string corresponding to the region of the treeview those coordinates occupy.
One of the return values is “separator”.
I’ve used this to catch double-click events on the separator to auto-size columns, but you could also use it to catch single-click events and block them.
For example:
def handle_click(event):
if treeview.identify_region(event.x, event.y) == "separator":
return "break"
#...
treeview.bind('<Button-1>', handle_click)
This has the advantage of not rendering the entire treeview disabled — so you can still select/expand/collapse rows, click column headings to sort, etc — you just won’t be able to resize the columns.
Note that even though resizing is disabled, the “double arrow” cursor (⇔) will still appear. You could additionally prevent the double arrow cursor from showing by doing the exact same thing with the <Motion> event (binding to it, checking if it’s above a separator, and stopping the event from being propagated by returning the string "break").
>>> sys.version '3.6.0 (v3.6.0:41df79263a11, Dec 23 2016, 08:06:12) [MSC v.1900 64 bit (AMD64)]' >>> tkinter.TkVersion 8.6