Re: Notebooks in Gtk+ v1.2.x
- From: Jim Parker <hopeye cfl rr com>
- To: Carlos Pereira <carlos pehoe civil ist utl pt>
- Cc: gtk-app-devel-list gnome org
- Subject: Re: Notebooks in Gtk+ v1.2.x
- Date: Thu, 23 Jan 2003 19:01:55 -0500
Ok, I may have spoken prematurely. I keep getting a SEGFAULT on the
following line of code:
gtk_widget_grab_focus( GTK_WIDGET(current->glarea));
where 'current' is a global variable of typDrawingArea * (see struct
definition below). I have defined a local varible of type
typDrawingArea and then assigned its memory address to 'current'.
gdb indicates the object cast is wrong.
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1024 (LWP 14198)]
0x40103fc0 in gtk_type_check_object_cast () from
/usr/lib/libgtk-1.2.so.0
(gdb) backtrace
#0 0x40103fc0 in gtk_type_check_object_cast () from
/usr/lib/libgtk-1.2.so.0
#1 0x0804ab24 in CreateMainWindow () at OpenGL_notebook.c:836
#2 0x080499ce in main (argc=1, argv=0xbffffd54) at
OpenGL_notebook.c:149
(gdb)gtk_widget_grab_focus(GTK_WIDGET(current->glarea));
I am using the struct from my first message:
typedef struct {
GtkWidget *notebook_page;
GtkWidget *glarea;
gint page_number;
GLfloat xRot;
GLfloat yRot;
GLfloat zRot;
GLfloat zoom;
gint current;
} typDrawingArea;
Thanks again for your help.
cheers
Jim Parker
On 2003.01.23 10:57 Carlos Pereira wrote:
Jim,
I think you are in the right track.
If I understand well, you have a master window
with a notebook controlling multiple slave windows,
each one with an independent drawing area.
Generally speaking, each window must know all the information
about itself, in a structure (object) and the master must know
the address of all the windows, in a list (of course this
is a over simplification).
My app has multiple (unlimited) top windows, each one
with its own OpenGL drawing area, which in turn draws
multiple (unlimited) layers, each one with its own
set of objects, lights, OpenGL parameters, etc.
My architecture is slightly different from yours,
because all my top_windows are masters, while you
chose a master-slave design, but the general principles
are the same.
Carlos
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