Re: Has anyone been able to force TreeView expander with no children?
ke, 2009-10-14 kello 18:52 -0700, Daniel B. Thurman kirjoitti: I have a FileViewer application that I am working on and so far I have not been able to force expanders on TreeView when there are only top-level directories/files populated in the TreeStore. As I understand it, the expander will only be shown for tree rows that have children. You want to show them always, so that you don't have to scan an entire directory tree to figure out which have children and which don't. Would one of the following approaches work for you? a) Add dummy items to nodes. When a node is expanded, and it has a dummy node, scan for subdirectories and replace the dummy node with real ones. This means even nodes without subdirectories will have an expander, which might be awkward for the user. b) Initially, add top level items and their immediate subdirectories. When a node is expanded the first time, scan its subdirectories' subdirectories and add those. That was confusing, let me show an example. Initially, have this ( means closed expander, v means open): aaa bbb ccc Here, you've scanned aaa and bbb and ccc for subdirectories. You know ccc doesn't have any, so it gets no children and no expander. aaa and bbb have children, so they get them and expanders. When aaa is expanded the first time, you scan aaa/* for subdirectories, and add them to their parent nodes (i.e., to children of aaa), before letting the aaa node be expanded on screen. In other words: v aaa aaa-1 aaa-2 aaa-3 bbb ccc Here, you scanned aaa-1, aaa-2, and aaa-3 for children, and found that aaa-2 has them. You can use a hidden column to keep track of which nodes have been expanded (= scanned). c) Do the scan in the background, modifying the tree when you find things. You can either let the scan go through the entire filesystem this way, or scan directories that are shown (a bit like in option b, but scanning is done in the background, not just when the node is about to be expanded). ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
The difference of mapping between toplevel window and popup window
Hello, I'm new to GTK+ programming.I encountered a problem in my program. There is a window which contain more widgets in my program, the widgets were mapped with more pictures(via gtkrc file ). The problem is: if the window is a toplevel window,you would saw flicker phenomenon; if the window is a popup window,you wouldn't saw flicker phenomenon,and mapped normally(no flikcer phenomenon). The flicker phenomenon not serious,but you could saw it with eyes.and popup window mapped normally( Why ?). The version of gtk is gtk+ - 2.12.9 (the OS is ubuntu 8.04 ), and it already set double buffer mechanism. How could I do to avoid flicker phenomenon ? Thanks, Eric ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Has anyone been able to force TreeView expander with no children?
On 10/14/2009 11:56 PM, Lars Wirzenius wrote:
ke, 2009-10-14 kello 18:52 -0700, Daniel B. Thurman kirjoitti:
I have a FileViewer application that I am working on
and so far I have not been able to force expanders
on TreeView when there are only top-level
directories/files populated in the TreeStore.
As I understand it, the expander will only be shown for tree rows that
have children. You want to show them always, so that you don't have to
scan an entire directory tree to figure out which have children and
which don't.
Would one of the following approaches work for you?
a) Add dummy items to nodes. When a node is expanded, and it has a dummy
node, scan for subdirectories and replace the dummy node with real ones.
This means even nodes without subdirectories will have an expander,
which might be awkward for the user.
b) Initially, add top level items and their immediate subdirectories.
When a node is expanded the first time, scan its subdirectories'
subdirectories and add those. That was confusing, let me show an
example. Initially, have this ( means closed expander, v means open):
aaa
bbb
ccc
Here, you've scanned aaa and bbb and ccc for subdirectories. You know
ccc doesn't have any, so it gets no children and no expander. aaa and
bbb have children, so they get them and expanders.
When aaa is expanded the first time, you scan aaa/* for subdirectories,
and add them to their parent nodes (i.e., to children of aaa), before
letting the aaa node be expanded on screen. In other words:
v aaa
aaa-1
aaa-2
aaa-3
bbb
ccc
Here, you scanned aaa-1, aaa-2, and aaa-3 for children, and found that
aaa-2 has them.
You can use a hidden column to keep track of which nodes have been
expanded (= scanned).
c) Do the scan in the background, modifying the tree when you find
things. You can either let the scan go through the entire filesystem
this way, or scan directories that are shown (a bit like in option b,
but scanning is done in the background, not just when the node is about
to be expanded).
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Yes, I have already implemented (b) as you suggested.
In reading the documentation, it was not clear at first, that
setting the boolean=True does not make expanders appear
when there are no children. This makes sense.
I still have some other issues to deal with:
(1) I am trying to find the expander-open event for the
connect method. I think it is something like:
self.treeview.connect('expander-open', self.on_expander_open)
Do you know of a link/reference listing GTK events for the
connect() method so that I can look them up?
(2) I note that for some reason when I open an expander, the
the icon/text next gets right justified.
The expected behavior is:
v aaa
aaa-1
aaa-2
bbb-1
bbb-2
aaa-3
bbb
ccc
But I get:
v aaa
aaa-1
aaa-2
bbb-1
bbb-2
aaa-3
bbb
ccc
So, every time one opens a sub-expander, the icon/text
cell keeps shifting further to the right. So how can I
correct this?
Thank you for replying,
and kind regards!
Dan
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Re: Has anyone been able to force TreeView expander with no children?
to, 2009-10-15 kello 07:44 -0700, Daniel B. Thurman kirjoitti: (1) I am trying to find the expander-open event for the connect method. I think it is something like: http://library.gnome.org/devel/gtk/stable/ has a list of all widgets, and lists for each widgets the signals they support. The page for each widget only lists the signals native to it, not the ones it inherits from its parent. I have not tried this, but this seems relevant to you: http://library.gnome.org/devel/gtk/stable/GtkTreeView.html#GtkTreeView-expand-collapse-cursor-row (2) I note that for some reason when I open an expander, the the icon/text next gets right justified. I am not sure what would happen to that, but my first guess is that you have one column for the expander, but no value to put in its cell, and another column for the folder name. If you remove the first column and mark the folder name column as the expander column (see link below), it might fix things. http://library.gnome.org/devel/gtk/stable/GtkTreeView.html#gtk-tree-view-set-expander-column ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Has anyone been able to force TreeView expander with no children?
On Thu, Oct 15, 2009 at 07:44:56AM -0700, Daniel B. Thurman wrote:
On 10/14/2009 11:56 PM, Lars Wirzenius wrote:
(1) I am trying to find the expander-open event for the
connect method. I think it is something like:
self.treeview.connect('expander-open', self.on_expander_open)
Do you know of a link/reference listing GTK events for the
connect() method so that I can look them up?
The signal is called row-expanded.
(2) I note that for some reason when I open an expander, the
the icon/text next gets right justified.
The expected behavior is:
v aaa
aaa-1
aaa-2
bbb-1
bbb-2
aaa-3
bbb
ccc
But I get:
v aaa
aaa-1
aaa-2
bbb-1
bbb-2
aaa-3
bbb
ccc
So, every time one opens a sub-expander, the icon/text
cell keeps shifting further to the right. So how can I
correct this?
You have the text in another column instead of directly in the expander
column?
Yeti
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Re: Has anyone been able to force TreeView expander with no children?
On Wed, 2009-10-14 at 18:52 -0700, Daniel B. Thurman wrote:
I have a FileViewer application that I am working on
and so far I have not been able to force expanders
on TreeView when there are only top-level
directories/files populated in the TreeStore.
You would think that doing something simple as:
[...]
self.treestore = gtk.TreeStore(str, gtk.gdk.Pixbuf, str)
self.treeview = gtk.TreeView(self.treestore)
self.treeview.set_show_expanders(True)
self.path = os.path.expanduser('~')
self.populate_treestore(path=self.path, recurse=0)
[...]
Would force the TreeView to show the expanders,
but I have not been able to get this to work. I need
the expanders so that when I expand the directory
in question, I would then trigger a call to add more
children, and so on.
If you want to populate data on-demand like this,
you're probably going to have to write your own
GtkTreeModel.
--
Shaun
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Re: Has anyone been able to force TreeView expander with no children?
On 10/15/2009 07:53 AM, Lars Wirzenius wrote:
to, 2009-10-15 kello 07:44 -0700, Daniel B. Thurman kirjoitti:
(1) I am trying to find the expander-open event for the
connect method. I think it is something like:
http://library.gnome.org/devel/gtk/stable/ has a list of all widgets,
and lists for each widgets the signals they support. The page for each
widget only lists the signals native to it, not the ones it inherits
from its parent. I have not tried this, but this seems relevant to you:
http://library.gnome.org/devel/gtk/stable/GtkTreeView.html#GtkTreeView-expand-collapse-cursor-row
(2) I note that for some reason when I open an expander, the
the icon/text next gets right justified.
I am not sure what would happen to that, but my first guess is that you
have one column for the expander, but no value to put in its cell, and
another column for the folder name. If you remove the first column and
mark the folder name column as the expander column (see link below), it
might fix things.
http://library.gnome.org/devel/gtk/stable/GtkTreeView.html#gtk-tree-view-set-expander-column
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Focusing only on (1) above, it appears that the signal I am seeking
for is: row-has-child-toggled, but I get an error saying:
self.treeview.connect('row-has-child-toggled', self.on_row_child_toggled)
TypeError: gtk.TreeView object at 0xb7b9ab6c (GtkTreeView at
0x8df5080): unknown signal name: row-has-child-toggled
It's documented, but is it functional, or is it the correct signal I am
seeking?
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Re: Has anyone been able to force TreeView expander with no children?
On 10/14/2009 06:52 PM, Daniel B. Thurman wrote:
[snip!]
Apologies. It appears that there is something wrong
with email-deliveries and I am not getting every
posting, so I will have to reply to certain individuals
that I have not received directly into my mailbox.
(I am looking directly at the archives for those I have missed)
David Nec(as yeti physics muni cz
(1) The signal is called row-expanded.
[Dan] Thank you! But how did you find this signal?
(2) You have the text in another column instead of directly in the
expander column?
[Dan] I have posted the experimental code hopefully the post is accepted.
Shaun McCance shaunm gnome org
(1) If you want to populate data on-demand like this,
you're probably going to have to write your own GtkTreeModel.
[Dan] Ugh. I will try to use the stock and see if I can get this to
work first!
Holger Berndt bern...@gmx.de (sent directly to me)
The way I do that is to add a single dummy child (with a text like
Loading...). That makes the top level entry expandable. When
the user expands the item, he gets feedback right away by seeing the
Loading... entry, while the code populates the model on the fly, and
finally removes the dummy entry.
Others (e.g. Nautilus list view) seem to do it similarly.
[Dan- All below]
The problem I have is: how do I capture the signal when the
row is expanded? I posted a follow up on this and it seems
that the key is row-has-child-toggled, but this does not
seem to work:
self.treeview.connect('row-has-child-toggled', self.on_row_activated)
TypeError: gtk.TreeView object at 0xb7b9ab6c (GtkTreeView at
0x8df5080): unknown signal name: row-has-child-toggled
I have, however tried:
self.treeview.connect('row-activated', self.on_row_activated)
and this works, except that the row has to be mouse
double-clicked, which is not what I want.
I sure wish there is a Python-GTK code somewhere
that I could peruse to resolve my many issues!
Since the code I have is experimental, I include it
in the following, so that it is open to critique and
may be of benefit to others following the same
pathway:
==
[code]
#!/usr/bin/env python
import os, stat, sys, time
import pygtk
pygtk.require('2.0')
import gtk
DEBUG=True
RECURSE=1
SEP=' '
DEFAULT_PATH='~/Desktop/'
class FileLister:
#column_names = ['Files', 'Size', 'Mode', 'Last Changed', 'Path']
column_names = ['Files']
# Close the window and quit
def delete_event(self, widget, event, data=None):
gtk.main_quit()
return False
def __init__(self, path=None):
cell_data_funcs = (
None,
self.file_size,
self.file_mode,
self.file_last_changed,
self.file_path)
# Create a new window
self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)
self.window.set_title(FileLister)
self.window.set_size_request(600, 400)
self.window.connect(delete_event, self.delete_event)
# TreeView
self.treestore = gtk.TreeStore(str, gtk.gdk.Pixbuf, int, bool, str)
self.treeview = gtk.TreeView(self.treestore)
# TreeView Options
self.treeview.set_level_indentation(0)
self.treeview.set_show_expanders(True)
#self.treeview.set_hover_expand(True)
#self.treeview.set_search_column(0)
#self.treeview.set_reorderable(True)
# TreeViewColumns
self.tvcolumn = [None] * len(self.column_names)
cellpb = gtk.CellRendererPixbuf()
self.tvcolumn[0] = gtk.TreeViewColumn(self.column_names[0], cellpb)
self.tvcolumn[0].set_cell_data_func(cellpb, self.file_pixbuf)
cell = gtk.CellRendererText()
self.tvcolumn[0].pack_start(cell, False)
self.tvcolumn[0].set_cell_data_func(cell, self.file_name)
self.treeview.append_column(self.tvcolumn[0])
# Append more TreeView columns, if available
for n in range(1, len(self.column_names)):
cell = gtk.CellRendererText()
self.tvcolumn[n] = gtk.TreeViewColumn(self.column_names[n],
cell)
if n == 1:
cell.set_property('xalign', 0.0)
self.tvcolumn[n].set_cell_data_func(cell, cell_data_funcs[n])
self.treeview.append_column(self.tvcolumn[n])
# Signals
#self.treeview.connect('row-activated', self.on_row_activated)
''' FOLLOWING DOES NOT WORK '''
self.treeview.connect('row-has-child-toggled',
self.on_row_activated)
# Populate TreeView with initial files
self.path = os.path.expanduser(DEFAULT_PATH)
self.dir_walk(path=self.path, recurse=RECURSE)
# Add scrolled Window
self.scrolledwindow = gtk.ScrolledWindow()
self.scrolledwindow.add(self.treeview)
self.window.add(self.scrolledwindow)
Pango problems
Out of no where my program decided to starthaving problems with Pango rendering. The GUI now shows text as thestandard no character boxes and all of the icons that were there havebeen replaced by the red x file icon. When I run the program I get a lot of errors like: (xpath_test:11200): Gtk-WARNING **: Error loading theme icon'gtk-media-record' for stock: Unable to load image-loading module:/usr/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-png.so:/usr/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-png.so: ELF loadcommand alignment not page-aligned (xpath_test:11200): Pango-WARNING **:/usr/lib/pango/1.6.0/modules/pango-basic-fc.so: ELF load commandalignment not page-aligned All of the code used was pretty much cut and pasted from anotherapplication that still displays fonts and icons correctly so I'm notsure what happened to this one. I can provide source code if anyone requires it. Build system - Linux 2.6.24-24-generic #1 SMP Fri Sep 18 16:49:39 UTC 2009 i686 GNU/Linux GLib: 2.16.6 GTK+: 2.12.9 GCC: 4.2.4 Pango: 1.20.5 Thanks, Geoff___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Has anyone been able to force TreeView expander with no children?
On Thu, Oct 15, 2009 at 10:25:23AM -0700, Daniel B. Thurman wrote: (1) The signal is called row-expanded. [Dan] Thank you! But how did you find this signal? I know about it. However, if I didn't I would go to http://library.gnome.org/devel/gtk/stable/GtkTreeView.html#GtkTreeView.signals or the same in devhelp assuming I have the API docs installed, or to the gtk.TreeView docs for Python. They all list all the signals. Yeti P.S.: Please don't cross-post though at this moment it is too late to stop it in this thread... ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
