GTK+ Forums

clinisbut · Familiar Face Joined: 10 Apr 2008 Posts: 19

I'm trying to figure out how to access a list of child widgets of a widget.
Specifically GtkTable child widgets to destroy them with GtkTable itself.

I'm not using Glade, I'm creating each widget "manually" from code and I can't store a pointer of each one (well, actually I could but I don't need this pointers except for its destruction after using them).

I found the function gtk_container_get_children and I tried to use it.

The structure I have is next:
GtkTable
|-each cell has:
|-vbox
|-DrawArea
|-hbox
| |-label
| |-entry
|
|-hbox
| |-label
| |-entry

Then, at user action I need to erase the complete table and create the same structure (with diferent values).

This is the code I wrote to try to destroy gtktable and its children

Code: (C++)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18	if( table!=NULL ) { GList* children = gtk_container_get_children( GTK_CONTAINER( table ) ); guint num_child = g_list_length( children ); cout << "NUM CHILDREN="<<num_child<<endl; int i=0; while( i<num_child ) { cout << "deleting child n:"<<i<<endl; gtk_widget_destroy( GTK_WIDGET( children->data ) ); children = children->next; ++i; } gtk_widget_destroy( GTK_WIDGET( table ) ); }

But the first time the code tries to erase throws me a lot of asserts:

gtk_box_pack_start: assertion `child->parent==NULL´ failed.

Maybe has to do with that if( table!=NULL ) ? Is it ok the way I check if table already exists?

Wolfgang · GTK+ Geek Joined: 05 Feb 2008 Posts: 53

Child widgets will be destroyed automatically with theyr parent... Isn't it?

clinisbut · Familiar Face Joined: 10 Apr 2008 Posts: 19

I dont' know,
anyway I'm interested in learn how to acces child widgets 'cause I need to get the value of all those entry widgets

Wolfgang · GTK+ Geek Joined: 05 Feb 2008 Posts: 53

So, your code is correct, althow I'm using function g_slist_next for GSList items enumeration.
In which moment this code snippet is executed? Is variable table global and initialized as NULL?

clinisbut · Familiar Face Joined: 10 Apr 2008 Posts: 19

This code is executed in a signal callback.
Actually I simplified the code so table is member of a class, this class is passed as gpointer argument to function callback.

So when I wrote "table" actually is "control->table".
Anyway, I think I solved the problem... but don't know what I touch XD.
I think I had a name conflict between function variables and class member variables. Also I deleted that widget by widget deletion and I delete the entire gtktable at once.

I have another question, but is about progressBars, do I need to open a new thread?

Wolfgang · GTK+ Geek Joined: 05 Feb 2008 Posts: 53

You may use timer or idle-function, must work.