Re: Help with closing a notebook page (GTK2)
On 4 July 2011 15:02, walter tallent w41...@yahoo.com wrote:
Hi.
I know I'm coming late to this party, but if you're packing the button into
the
tab, it's a child of that notebook page. Can't you retrieve the page you're
on
by simply calling gtk_notebook_page_num () with the button passed in as the
child during the button's clicked signal handler? Then you pass the returned
page number to gtk_notebook_remove_page (). This way you'll always remove
the
correct page, and it doesn't matter if the user brings that page to the front
first or not.
Or is there something I've overlooked?
walter
From: Bill C bi...@netspace.net.au
To: gtk-app-devel-list@gnome.org
Sent: Sun, July 3, 2011 3:54:13 PM
Subject: Re: Help with closing a notebook page (GTK2)
On 04/07/11 06:26, Neil Munro wrote:
On 3 July 2011 19:31, Thomas Bollmeiertbollme...@web.de wrote:
Ursprüngliche Nachricht-
Von: Neil Munroneilmu...@gmail.com
Gesendet: 02.07.2011 23:40:02
An: gtk-app-devel-list@gnome.org
Betreff: Help with closing a notebook page (GTK2)
Hi, I have used pygtk before so I am familiar with some of the basic
concepts of gtk, but this is my first attempt with an actual gtk+ C
application and I have run into a few issues.
I have a notebook that I wish to have a close button on the page tabs
that when clicked closes the tabs.
I know that it's a bit off a faf to do as you don't know the page
prior to the event. So you have to dynamically detect which tab is
being closed by using a tab child widget.
Now I believe I have done this in code, except it always returns -1
which then firmly tells me I have done something wrong.
I have attached the code for your reference in the hopes that someone
shall be able to point out my no doubt simple mistake.
Many thanks in advance,
Neil Munro
I faced a similar problem when I wrote an editor for the first version of my
gobjectcreator tool some time ago. It was
implemented in PyGTK - nevertheless it should work in C as well. The
solution
may not be elegant but it
worked:
I registered a handler for the clicked-signal of the close button within
the
tab label widget (a GtkHBox).
Within the handler implementation I looped over all pages of the notebook
and
checked whether the button instance
in the page label was identical to the sender instance of the
clicked-signal.
If yes then I had to remove the
corresponding page.
You can find the code example here:
https://github.com/ThomasBollmeier/GObjectCreator/blob/master/gobject_creator/ui/documents_view.py
y
(see lines 342ff. and 378ff. respectively)
Hope that helps.
Regards,
Thomas
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Thanks to this and Bills suggestion the correct page closes, but I
need to determine a way to re-calculate the page as soon as a tab is
closed, am sure I will figure something out, but thanks for the
patience and help!
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Hi Neil
Yes the page numbers can change when a page is closed, so you cant use
original page numbers directly to switch pages.
I think I redesigned so that I did not use page numbers. Let the user
switch pages and process the page the user is working with. Ensure the
user cant delete pages that are prior to a page you want to reference
directly. As Thomas said... Not totally elegant.
Rgds Bill
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Well I have a method to correctly get the tab page, it might not be
the best way but it's what came naturally to me, I am having issues
with the memory management. Now I understand the principle of linked
lists/memory management etc but I have only previously created small
test programs, nothing inside a real program, so am having trouble
applying theory to practical.
Below is the function I am writing, I am aware I am not freeing any
memory yet, but some tabs wont close even after I have supposedly
adjusted the linked list, so I am at a loss as to how I am to make
this work, any help would be appreciated!
static void Close( GtkWidget *widget, struct data *tmp )
{
// Re-configure linked list to reflect new tab positions
struct node *ptr = head;
struct node *prev = ptr;
g_print( Old list!\n\n );
ptr = head;
while( ptr-Next != NULL )
{
if( ptr == tmp-Ptr )
{
Strange glibc detected invalid pointer with gtk_entry
I have an issue with nearly all gtk+ programs: since about one week the programs
crash at startup with some fault like this:
*** glibc detected *** ./gtk-tab2: munmap_chunk(): invalid pointer:
0x01aa8eb0 ***
=== Backtrace: =
/lib64/libc.so.6[0x365a47703a]
/lib64/libglib-2.0.so.0(g_free+0x23)[0x365c449743]
But if I start the program via ssh it runs as expected:
ssh -X $HOSTNAME myprogram
AND if I link without -lmcheck it is ok too ...
I deleted all code which did not affect this issue:
It is not much more than another Hello World example but using gtk_entry to
display the text (#if 1):
Fedora 15 and gtk3-3.0.11-1.fc15.x86_64
(gtk2 will fail too)
Can someone tell me what I should do next?
==
/* test with
* gcc -Wall -g -o gtk-tab gtk-tab.c -lmcheck `pkg-config --cflags --libs
gtk+-3.0` ./gtk-tab
*/
#include stdlib.h
#include string.h
#include gtk/gtk.h
#define SUMMARY gtk test
#define TRACE(l,fmt,args...) fprintf(stderr,#%03d#%9.9s:%3d#
fmt\n,l,__FILE__,__LINE__,##args)
int main( int argc, char **argv ) {
GtkWidget *window;
GtkWidget *value;
TRACE(9,gtk init);
gtk_init (argc, argv);
TRACE(12,gtk create a new window);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), SUMMARY);
g_signal_connect (G_OBJECT (window), destroy,
G_CALLBACK (gtk_main_quit), NULL);
TRACE(12,Create the text);
#if 1
value = gtk_entry_new();
gtk_entry_set_text( GTK_ENTRY(value), test 123 );
#else
value = gtk_label_new(test 123);
#endif
gtk_container_add (GTK_CONTAINER (window), value);
TRACE(12,gtk show all);
gtk_widget_show_all (window);
TRACE(11,gtk loop: start);
gtk_main ();
TRACE(11,gtk loop: done);
return 0;
}
==
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Re: Strange glibc detected invalid pointer with gtk_entry
On Tuesday 05 July 2011 14:24:48 Herbert Gasiorowski wrote:
I have an issue with nearly all gtk+ programs: since about one week the
programs
crash at startup with some fault like this:
*** glibc detected *** ./gtk-tab2: munmap_chunk(): invalid pointer:
0x01aa8eb0 ***
=== Backtrace: =
/lib64/libc.so.6[0x365a47703a]
/lib64/libglib-2.0.so.0(g_free+0x23)[0x365c449743]
But if I start the program via ssh it runs as expected:
ssh -X $HOSTNAME myprogram
AND if I link without -lmcheck it is ok too ...
I deleted all code which did not affect this issue:
It is not much more than another Hello World example but using gtk_entry to
display the text (#if 1):
Fedora 15 and gtk3-3.0.11-1.fc15.x86_64
(gtk2 will fail too)
Can someone tell me what I should do next?
==
/* test with
* gcc -Wall -g -o gtk-tab gtk-tab.c -lmcheck `pkg-config --cflags --libs
gtk+-3.0` ./gtk-tab
*/
#include stdlib.h
#include string.h
#include gtk/gtk.h
#define SUMMARY gtk test
#define TRACE(l,fmt,args...) fprintf(stderr,#%03d#%9.9s:%3d#
fmt\n,l,__FILE__,__LINE__,##args)
int main( int argc, char **argv ) {
GtkWidget *window;
GtkWidget *value;
TRACE(9,gtk init);
gtk_init (argc, argv);
TRACE(12,gtk create a new window);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), SUMMARY);
g_signal_connect (G_OBJECT (window), destroy,
G_CALLBACK (gtk_main_quit), NULL);
TRACE(12,Create the text);
#if 1
value = gtk_entry_new();
gtk_entry_set_text( GTK_ENTRY(value), test 123 );
#else
value = gtk_label_new(test 123);
#endif
gtk_container_add (GTK_CONTAINER (window), value);
TRACE(12,gtk show all);
gtk_widget_show_all (window);
TRACE(11,gtk loop: start);
gtk_main ();
TRACE(11,gtk loop: done);
return 0;
}
==
I in the past used this function this insert text in entry widgets, don't know
if it helps in your case:
void my_gtk_entry_set_text(GtkEntry *entry, char *data)
{
char *tmp;
if (!data) data = ;
if (g_utf8_validate(data, -1, NULL) != TRUE) {
tmp = g_locale_to_utf8(data, -1, NULL, NULL, NULL);
gtk_entry_set_text(entry, tmp);
xfree(tmp);
} else {
gtk_entry_set_text(entry, data);
}
}
Hope this helps.
ZZ
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Re: Strange glibc detected invalid pointer with gtk_entry
On 2011-07-05 at 15:05, z...@excite.it wrote:
void my_gtk_entry_set_text(GtkEntry *entry, char *data)
{
char *tmp;
if (!data) data = ;
if (g_utf8_validate(data, -1, NULL) != TRUE) {
tmp = g_locale_to_utf8(data, -1, NULL, NULL, NULL);
gtk_entry_set_text(entry, tmp);
xfree(tmp);
agh!
g_locale_to_utf8() returns memory allocated through the GLib API; you
need to call g_free() to free it. *do not* mix GLib's memory allocation
functions with other allocation functions.
ciao,
Emmanuele.
--
W: http://www.emmanuelebassi.name
B: http://blogs.gnome.org/ebassi
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Re: Help with closing a notebook page (GTK2)
You seem to be unintentionally making things very hard for yourself. I don't know anything about the purpose of your app, but you do not need to implement your own linked list, GLib already has a very capable list API built in. Also, the notebook already behaves like a linked list, so all the list related operations you're coding are only serving to cause you headaches. If you want to code a linked list for learning purposes, choose a very simple approach, like a list of integers. Code it in a separate program. Once you understand how all the operations affect the list, use the GLib code. It is already stable and effective. If it's an issue of not knowing whether the functionality is implemented for you, check the reference material. Don't be hesitant about consulting the GLib/GTK docs or code. There's much to be learned there. As far as things like page numbers, if you need to keep track of information that is associated with the page, but not actually part of the page, I suggest you look into using g_object_set_data () and g_object_get_data (). Again, the wheel has already been invented and debugged. You made a statement that I think might be at the heart of your troubles. If you are not interested in using the best method, you are only making things harder on yourself. Of course the best method is always subjective. A method tends to be the viewed as the best when it gets the job done in the fewest lines of code, and takes most advantage of code that has already been written and stabilized. You would do yourself a huge favor by making this your approach. That may mean more reading than coding at first, but the payoff is undeniable. take it easy walter From: Neil Munro neilmu...@gmail.com To: gtk-app-devel-list@gnome.org Sent: Tue, July 5, 2011 6:51:01 AM Subject: Re: Help with closing a notebook page (GTK2) On 4 July 2011 15:02, walter tallent w41...@yahoo.com wrote: Hi. I know I'm coming late to this party, but if you're packing the button into the tab, it's a child of that notebook page. Can't you retrieve the page you're on by simply calling gtk_notebook_page_num () with the button passed in as the child during the button's clicked signal handler? Then you pass the returned page number to gtk_notebook_remove_page (). This way you'll always remove the correct page, and it doesn't matter if the user brings that page to the front first or not. Or is there something I've overlooked? walter From: Bill C bi...@netspace.net.au To: gtk-app-devel-list@gnome.org Sent: Sun, July 3, 2011 3:54:13 PM Subject: Re: Help with closing a notebook page (GTK2) On 04/07/11 06:26, Neil Munro wrote: On 3 July 2011 19:31, Thomas Bollmeiertbollme...@web.de wrote: Ursprüngliche Nachricht- Von: Neil Munroneilmu...@gmail.com Gesendet: 02.07.2011 23:40:02 An: gtk-app-devel-list@gnome.org Betreff: Help with closing a notebook page (GTK2) Hi, I have used pygtk before so I am familiar with some of the basic concepts of gtk, but this is my first attempt with an actual gtk+ C application and I have run into a few issues. I have a notebook that I wish to have a close button on the page tabs that when clicked closes the tabs. I know that it's a bit off a faf to do as you don't know the page prior to the event. So you have to dynamically detect which tab is being closed by using a tab child widget. Now I believe I have done this in code, except it always returns -1 which then firmly tells me I have done something wrong. I have attached the code for your reference in the hopes that someone shall be able to point out my no doubt simple mistake. Many thanks in advance, Neil Munro I faced a similar problem when I wrote an editor for the first version of my gobjectcreator tool some time ago. It was implemented in PyGTK - nevertheless it should work in C as well. The solution may not be elegant but it worked: I registered a handler for the clicked-signal of the close button within the tab label widget (a GtkHBox). Within the handler implementation I looped over all pages of the notebook and checked whether the button instance in the page label was identical to the sender instance of the clicked-signal. If yes then I had to remove the corresponding page. You can find the code example here: https://github.com/ThomasBollmeier/GObjectCreator/blob/master/gobject_creator/ui/documents_view.py y (see lines 342ff. and 378ff. respectively) Hope that helps. Regards, Thomas ___ Schon gehört? WEB.DE hat einen genialen Phishing-Filter in die Toolbar eingebaut! http://produkte.web.de/go/toolbar Thanks to this and Bills suggestion the correct page closes, but I need to determine a way to re-calculate the page as soon as a tab is closed, am sure I will figure something out, but thanks for the
GTK+ 3.1.8
GTK+ 3.1.8 is now available for download at: ftp://ftp.gtk.org/pub/gtk/3.1/ http://download.gnome.org/sources/gtk+/3.1/ 0a0bb52af6c8220c40ed82e7361d353e6e1010480cba7b37863178c1d8f16d3e gtk +-3.1.8.tar.xz e51970133bb6ff7d585ce9f678e8ce6e3073a1b1d455cc42671503ce71d93533 gtk +-3.1.8.tar.bz2 Another release in the 3.1 development cycle. GTK+ is a multi-platform toolkit for creating graphical user interfaces. Offering a complete set of widgets, GTK+ is suitable for projects ranging from small one-off tools to complete application suites. GTK+ has been designed from the ground up to support a range of languages, not only C/C++. Using GTK+ from languages such as Perl and Python (especially in combination with the Glade GUI builder) provides an effective method of rapid application development. GTK+ is free software and part of the GNU Project. However, the licensing terms for GTK+, the GNU LGPL, allow it to be used by all developers, including those developing proprietary software, without any license fees or royalties. Overview of Changes in GTK+ 3.1.8 = * Theming improvements: - Multiple colors are now supported - Support CSS font properties like font-size, font-family, etc - nth-child works for toolbars too * Bug fixes: 652506 Improve GtkAssistant button labels 652618 themingengine: shrink the background size to the padding-box 652769 Reordering/removing hidden children in GtkBox results in 100% CPU 653053 Avoid GApplication being released twice... 653191 uninitialized variable in completion_match_func 65 Assigned value is garbage or undefined in gtktoolpalette.c:565 653512 GtkEntryCompletion: Use a PAGE_STEP macro instead of a magic number 653785 GtkStyleContext ignores style classes when getting style properties * Translation updates: Belarusian Dutch Galician Hebrew Norwegian bokmål Persian Slovenian Spanish Thanks to all contributors: Benjamin Otte Juan A. Suarez Romero William Jon McCann Xan Lopez Cosimo Cecchi Chun-wei Fan José Aliste Javier Jardón Claudio Saavedra Colin Walters Scott Moreau Murray Cumming Paolo Borelli Mike Gorse John Palmieri Juan Pablo Ugarte Vincent Untz July 5, 2011 Matthias Clasen ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
GLib 2.29.10
GLib 2.29.10 is now available for download at: ftp://ftp.gtk.org/pub/glib/2.29/ http://download.gnome.org/sources/glib/2.29/ 260f91e9cf051b712a344d34579a5403eb1dfb58127a4395b0d7f7385f1305cd glib-2.29.10.tar.xz 81eabdc56ac8a64900e798805f35655395f20f5155b57b42f577311ee45234bb glib-2.29.10.tar.bz2 The is another development snapshot of the 2.29 series. Overview of changes from GLib 2.29.8 to 2.29.10 === * New features: - g_desktop_app_info_get_nodisplay: a function that is required to port gnome-menus to GDesktopAppInfo - g_hash_Table_iter_replace: new function to replace a value while iterating over a hash table - g_utf8_substring: convenience API to extract substrings from UTF-8 strings - g_action_group_add_entries: convenience API for creating lots of actions quickly - Use eventfd instead of pipes for waking up main contexts and for cancellation when available - GMatchInfo is now a refcounted boxed type * API changes in GAction: - the 'set_state' entry in the GActionInterface vtable has been renamed to 'change_state - g_action_set_state has been renamed to g_action_change_state - the 'state' property has been changed to read-only - GSimpleAction can no longer be subclassed * Bug fixes 647796 g_variant_new_variant is not marked as constructor 652072 gmain: make use of signalfd() 652168 Crosscompiling Fails if build=2.24 and host 2.24 652750 make dist fails 652758 GDataInputStream: Clarify g_data_input_stream_read_line docs... 652822 Add a g_hash_table_iter_replace 652897 tiny docs clarification for g_utf8_to_ucs4_fast 653140 gmain: use Linux eventfd() for main context wake up 653429 drop AM_MAINTAINER_MODE or enable it by default 653484 GAsyncCallbacks should default to allow-none Add missing fundamental types to the generic marshaller * Translation updates Belarusian Galician Russian Thanks to all contributors: Vincent Untz Xan Lopez Colin Walters David Zeuthen Ryan Lortie Murray Cumming Patrick Welche Chun-wei Fan Christian Persch Javier Jardón Philip Van Hoof Dan Winship Sebastian Dröge Krzesimir Nowak Claudio Saavedra Emmanuele Bassi Dieter Verfaillie July 5, 2011 Matthias Clasen ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Strange glibc detected invalid pointer with gtk_entry
On Tuesday 05 July 2011 16:19:00 Emmanuele Bassi wrote:
On 2011-07-05 at 15:05, z...@excite.it wrote:
void my_gtk_entry_set_text(GtkEntry *entry, char *data)
{
char *tmp;
if (!data) data = ;
if (g_utf8_validate(data, -1, NULL) != TRUE) {
tmp = g_locale_to_utf8(data, -1, NULL, NULL, NULL);
gtk_entry_set_text(entry, tmp);
xfree(tmp);
agh!
g_locale_to_utf8() returns memory allocated through the GLib API; you
need to call g_free() to free it. *do not* mix GLib's memory allocation
functions with other allocation functions.
Hi,
to be honest :-) I'm doing this for a long time and never experienced problems.
Cannot imagine glib calling something different than malloc/calloc/realloc at
the low level
so unless there are some special profiler or debug functions free should be ok
or at least
it for me worked flawlessly in linux and windows. I think there must be more
than a simple no-no.
Thanks for your hint will try to correct this bad habit in the future.
To fix my code a simple
#define malloc g_malloc
#define free g_free
#define calloc g_calloc
#define realloc g_realloc
should do it. Right?
Ciao,
Tito
ciao,
Emmanuele.
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