Re: tkinter ttk.Treeview: changing background colour of single item when selected
Il 12/02/23 12:10, John O'Hagan ha scritto: > My goal was to be able to change the colour of an individual item > regardless of whether it is selected or not. To do that, it is > necessary to be able to change the colour of an individual selected > item, without changing the selection or changing the colour of other > selected items. It seems this isn't possible. ok sorry. As another alternative I had thought of this: from tkinter import * from tkinter.ttk import * root = Tk() t = Treeview(root) t.insert('', 0, iid='item1', text='item1') t.insert('', 1, text='item2') t.tag_configure('flashtag', background='red') t.pack() style = Style() styleDefault = (style.map("Treeview")) def flash(): tags = t.item('item1', 'tags') t.item('item1', tags='' if tags else 'flashtag') t.after(500, flash) itemselected = t.selection() for x in itemselected: if (x == 'item1'): style.configure('Treeview', selectbackground='red') style.map('Treeview', background=[('disabled', 'white')], foreground=[('disabled', 'red')]) else: style.map('Treeview', background=[('selected', styleDefault['background'][1][1])], foreground=[('selected', styleDefault['background'][0][1])]) flash() mainloop() Maybe it can be useful for other situations. Bye bye -- https://mail.python.org/mailman/listinfo/python-list
Re: tkinter ttk.Treeview: changing background colour of single item when selected
On Sun, 2023-02-12 at 08:59 -0500, Thomas Passin wrote: [...] > On 2/12/2023 6:10 AM, John O'Hagan wrote: [...] > > > > My goal was to be able to change the colour of an individual item > > regardless of whether it is selected or not. To do that, it is > > necessary to be able to change the colour of an individual selected > > item, without changing the selection or changing the colour of > > other > > selected items. It seems this isn't possible. > > I haven't worked with ttk objects or Treeviews, but judging from old > style objects, I think you have to re-apply your color and flashing > when > the item becomes selected and possibly again when it becomes > unselected. > > Depending on exactly what effect you want, you may also need to apply > color and flashing when the mouse moves over the item and again when > it > leaves. When I make changes in e.g. color, I like to save the > previous > value(s) in the object itself. That way I can easily restore say a > background color without having to work out what it used to be, which > may be some color that Tk applies based on the desktop theme and who > know what else. > > Here's an example (simplified) for changing color on mouse hover and > leave events: > > BG_KEY = 'bg' if platform.lower().startswith('win') \ > else 'activebackground' # Different for Linux! > > def on_enter(event): > w = event.widget > w.old_bg = w.cget('bg') > w[BG_KEY] = BUTTON_HOVER # Color you have chosen > > def on_leave(event): > w = event.widget > _bg = w.old_bg > w[BG_KEY] = _bg > > Thank you again for your reply, Thomas. I didn't know tkinter configuration keys have different names on different platforms, that seems unneccesary! I also like the idea of storing the original settings on the object itself. However, because of the nature of ttk widgets, I think I'm stuck with my original issue. Unlike classic tkinter widgets, a lot of the ttk configuration options are not available on individual widgets, but must be done through styles or tags. On Treeviews (and possibly other ttk widgets), the colours for selected items can only be set using style.map (AFAIK). The colours for individual items can (only?) be set using tags, but this is evidently overridden when the item is selected by the selection colour dictated by the style. Treeview tags do not have a 'selectbackground' option like many tkinter widgets do. (Fonts _can_ be set this way, so I could flash, say, the font size, but that's ugly!) As as aside, IMO ttk looks great (and Treeview is really useful) but this approach to configuration is a double-edged sword. On one hand it's super-easy to change the whole look, but on the other, it can be overly restrictive if you want to control the look of individual widgets. I might try to put forward a feature request to add a 'selectbackground' option to ttk tags to see if there's any interest. Thanks -- John -- https://mail.python.org/mailman/listinfo/python-list
Re: tkinter ttk.Treeview: changing background colour of single item when selected
On 2/12/2023 6:10 AM, John O'Hagan wrote: On Mon, 2023-02-06 at 10:19 -0800, stefalem wrote: Il giorno sabato 4 febbraio 2023 alle 11:43:29 UTC+1 John O'Hagan ha scritto: ... Is there another way to do what I want? from tkinter import * from tkinter.ttk import * root = Tk() t = Treeview(root) t.insert('', 0, iid='item1', text='item1') t.insert('', 1, text='item2') t.tag_configure('flashtag', background='red') t.pack() def flash(): tags = t.item('item1', 'tags') t.item('item1', tags='' if tags else 'flashtag') t.after(500, flash) itemselected = t.selection() for x in itemselected: if (x == 'item1'): t.selection_remove(t.get_children()) flash() Thank you for your reply. Unfortunately that's not quite what I'm after, because it unselects the flashing item. My goal was to be able to change the colour of an individual item regardless of whether it is selected or not. To do that, it is necessary to be able to change the colour of an individual selected item, without changing the selection or changing the colour of other selected items. It seems this isn't possible. I haven't worked with ttk objects or Treeviews, but judging from old style objects, I think you have to re-apply your color and flashing when the item becomes selected and possibly again when it becomes unselected. Depending on exactly what effect you want, you may also need to apply color and flashing when the mouse moves over the item and again when it leaves. When I make changes in e.g. color, I like to save the previous value(s) in the object itself. That way I can easily restore say a background color without having to work out what it used to be, which may be some color that Tk applies based on the desktop theme and who know what else. Here's an example (simplified) for changing color on mouse hover and leave events: BG_KEY = 'bg' if platform.lower().startswith('win') \ else 'activebackground' # Different for Linux! def on_enter(event): w = event.widget w.old_bg = w.cget('bg') w[BG_KEY] = BUTTON_HOVER # Color you have chosen def on_leave(event): w = event.widget _bg = w.old_bg w[BG_KEY] = _bg -- https://mail.python.org/mailman/listinfo/python-list
Re: tkinter ttk.Treeview: changing background colour of single item when selected
On Mon, 2023-02-06 at 10:19 -0800, stefalem wrote: > Il giorno sabato 4 febbraio 2023 alle 11:43:29 UTC+1 John O'Hagan ha > scritto: > ... > > > Is there another way to do what I want? > > from tkinter import * > from tkinter.ttk import * > > root = Tk() > t = Treeview(root) > > t.insert('', 0, iid='item1', text='item1') > t.insert('', 1, text='item2') > t.tag_configure('flashtag', background='red') > t.pack() > > def flash(): > tags = t.item('item1', 'tags') > t.item('item1', tags='' if tags else 'flashtag') > t.after(500, flash) > itemselected = t.selection() > for x in itemselected: > if (x == 'item1'): > t.selection_remove(t.get_children()) > > flash() Thank you for your reply. Unfortunately that's not quite what I'm after, because it unselects the flashing item. My goal was to be able to change the colour of an individual item regardless of whether it is selected or not. To do that, it is necessary to be able to change the colour of an individual selected item, without changing the selection or changing the colour of other selected items. It seems this isn't possible. Thanks John -- https://mail.python.org/mailman/listinfo/python-list
Re: tkinter ttk.Treeview: changing background colour of single item when selected
I apologize for the 3 messages sent, I could not access the usual news server and with Google Groups I messed up :) -- https://mail.python.org/mailman/listinfo/python-list
Re: tkinter ttk.Treeview: changing background colour of single item when selected
> Is there another way to do what I want? try this: from tkinter import * from tkinter.ttk import * root = Tk() t = Treeview(root) t.insert('', 0, iid='item1', text='item1') t.insert('', 1, text='item2') t.tag_configure('flashtag', background='red') t.pack() def flash(): tags = t.item('item1', 'tags') t.item('item1', tags='' if tags else 'flashtag') t.after(500, flash) itemselected = t.selection() for x in itemselected: if (x == 'item1'): t.selection_remove(t.get_children()) flash() mainloop() -- https://mail.python.org/mailman/listinfo/python-list
Re: tkinter ttk.Treeview: changing background colour of single item when selected
Il giorno sabato 4 febbraio 2023 alle 11:43:29 UTC+1 John O'Hagan ha scritto: ... > Is there another way to do what I want? from tkinter import * from tkinter.ttk import * root = Tk() t = Treeview(root) t.insert('', 0, iid='item1', text='item1') t.insert('', 1, text='item2') t.tag_configure('flashtag', background='red') t.pack() def flash(): tags = t.item('item1', 'tags') t.item('item1', tags='' if tags else 'flashtag') t.after(500, flash) itemselected = t.selection() for x in itemselected: if (x == 'item1'): t.selection_remove(t.get_children()) flash() > Thanks > > -- > > John -- https://mail.python.org/mailman/listinfo/python-list
Re: tkinter ttk.Treeview: changing background colour of single item when selected
I haven't worked specifically with a Treeview, but I think you need to detect the onClick event (or an onSelect event if there is one) and have that trigger the flashing. Otherwise the selection probably overwrites styling that you added. That's what I do for classic Tk buttons to make them flash when selected. (I only flash once, though; I don't keep them flashing). On 2/4/2023 5:42 AM, John O'Hagan wrote: Hi list I'm using a ttk Treeview to display a hierarchical data structure. When an error condition arises in a node, I want the corresponding item in the Treeview to flash its background color. Using a tag to flash the item background works, except when the item is selected, when the tag has no effect. I want the item to keep flashing even when selected. The code below is a minimal example of the issue. It displays a Treeview containing two items with the first one flashing. If you select it, you don't see the flashing anymore. from tkinter import * from tkinter.ttk import * root = Tk() t = Treeview(root) t.insert('', 0, iid='item1', text='item1') t.insert('', 1, text='item2') t.tag_configure('flashtag', background='red') t.pack() def flash(): tags = t.item('item1', 'tags') t.item('item1', tags='' if tags else 'flashtag') t.after(500, flash) flash() mainloop() Other than tags, the only other way I've found to dynamically change Treeview backgrounds is using styles, in particular Style.map to configure the background of a selected item, but they apply to all items in the Treeview and would flash all selected items, not just the one I want to keep flashing. Is there another way to do what I want? Thanks -- John -- https://mail.python.org/mailman/listinfo/python-list
tkinter ttk.Treeview: changing background colour of single item when selected
Hi list I'm using a ttk Treeview to display a hierarchical data structure. When an error condition arises in a node, I want the corresponding item in the Treeview to flash its background color. Using a tag to flash the item background works, except when the item is selected, when the tag has no effect. I want the item to keep flashing even when selected. The code below is a minimal example of the issue. It displays a Treeview containing two items with the first one flashing. If you select it, you don't see the flashing anymore. from tkinter import * from tkinter.ttk import * root = Tk() t = Treeview(root) t.insert('', 0, iid='item1', text='item1') t.insert('', 1, text='item2') t.tag_configure('flashtag', background='red') t.pack() def flash(): tags = t.item('item1', 'tags') t.item('item1', tags='' if tags else 'flashtag') t.after(500, flash) flash() mainloop() Other than tags, the only other way I've found to dynamically change Treeview backgrounds is using styles, in particular Style.map to configure the background of a selected item, but they apply to all items in the Treeview and would flash all selected items, not just the one I want to keep flashing. Is there another way to do what I want? Thanks -- John -- https://mail.python.org/mailman/listinfo/python-list