ttk.Treeview - Can't change row height

Question

I\'m using ttkcalendar.py which can be found in this link.

I\'ve adapted it for use in Python 3.3

Basically what i\'m trying to do

Answer 1

I found that the Tkinter Font object has a metrics() method, that gives its height as "linespace". That allows the row height to be scaled dynamically:

try:
    from tkinter.font import Font
    from tkinter.ttk import Style, Treeview
    from tkinter import *         
except:
    from tkFont import Font
    font ttk import Style, Treeview
    from Tkinter import *

font=Font(family='Arial', size=20)
font.metrics()
#output: {'ascent': 31, 'descent': 7, 'linespace': 38, 'fixed': 0}

With that, you can get the font height with:

font.metrics()['linespace']
#output: 38

Then use it to set the rowheight in your Treeview widget:

fontheight=font.metrics()['linespace']

style=Style()
style.configure('Calendar.Treeview', font=font, rowheight=fontheight)   

tree=Treeview(style='Calendar.Treeview')

Changing the font object parameters comfortably updates the Treeview widget, but the rowheight doesn't get updated, and needs to be redone. So for example, scaling the font size with a keyboard shortcut may look like this:

def scaleup():
    font['size']+=1
    style.configure('Calendar.Treeview', rowheight=font.metrics()['linespace'])

def scaledown():
    font['size']-=1
    style.configure('Calendar.Treeview', rowheight=font.metrics()['linespace'])

tree.bind('<Control-equal>', scaleup)
tree.bind('<Control-minus>', scaledown)

I actually wanted to do the same with Control-MouseWheel, but didn't figure out the behavior yet (Would be glad to hear how that works).

Hope this comes handy.

Answer 2

Perhaps like you, I expected lines to expand as necessary. But I confirmed the problem with the code below, with the solution (the two style lines) omitted. When I could not find the solution here and the corresponding Style page, I googled and found this. Scroll down to Emiliano's answer, and some of the following (there is also an indent option).

import tkinter as tk
from tkinter import ttk

root = tk.Tk()
root.geometry('500x200')
style = ttk.Style(root)
style.configure('Treeview', rowheight=40)  #SOLUTION
tree = ttk.Treeview(root)
tree.insert('', 0, text='Line 1 of many XXX', tags='T')
tree.insert('', 1, text='Line 2 of many XXX', tags='T')
tree.insert('', 2, text='Line 3 of many XXX', tags='T')
tree.column('#0', stretch=True)
tree.tag_configure('T', font='Arial 20')
tree.pack(fill='x')

The above, with the answer omitted, is an example of minimal code that exhibits the problem. This is the sort of thing to post!

EDIT 1:

To make the Calendar widget properly importable and usable in another application, it should use a custom style, so its style does not affect any other treeviews in the app.

style.configure('Calendar.Treeview', rowheight=40)
tree = ttk.Treeview(root, style='Calendar.Treeview')

EDIT 2:

I am just learning about ttk styles myself. To answer your relief question, I went to this style doc and tried the following in Idle's Shell after running the above, with the two modifications in Edit 1.

>>> style.layout('Calendar.Treeview')
[('Treeview.field', {'sticky': 'nswe', 'children': [('Treeview.padding',
{'sticky': 'nswe', 'children': [('Treeview.treearea', {'sticky': 'nswe'})]})], 'border': '1'})]
>>> style.element_options('Calendar.Treeview.border')
('-relief',)
>>> style.lookup('Calendar.Treeview.border', 'relief')
''
>>> style.configure('Calendar.Treeview.border', relief='raised')
{}

I do not see any border nor did not see any effect of the setting. Perhaps relief applies to borders between columns. I don't know. (Note that changing rowheight is immediately available, so configuration is 'live'.)

Answer 3

How can I change the height of the rows in the treeview as in prevoius attempts font size can be increased but the row height does not increase with font size. - STILL AWAITING HELP

In case you are still awaiting help on this one, there is a way to change the row height, though that google groups thread says that it isn't officially supported by Tk:

#apply any configuration options
ttk.Style().configure('Treeview',rowheight=30)