Re: specify which child widget to be on top in GtkFixed?!

[Tristan Van Berkom <tvb gnome org>]

Widgets dont overlap in GTK+, instead one widget is packed into another
widget and sits along side other widgets inside its container - who packs
them in a way that they will not overlap.

FYI, GtkFixed is a special case widget you dont want to be using if your
application has any resize capabilities at all (yes, GtkFixed places widgets
on top of eachother when you forgot to place them with enough space between
them, because GtkFixed assumes you are using all the width/height available;
but there is no conceptual "Z" coordinate).

If you need to have widgets that overlap, you might consider using a canvas
api (like goocanvas for instance), or maybe use clutter.

Cheers,
          -Tristan

On Tue, Feb 9, 2010 at 9:21 AM, ferar achkar <fachkar datawind gmail com> wrote:
> greetings,
> I'm having trouble with GtkFixed and their children, how can I specify
> which child widget to be on top. In the code snippet below no matter
> were I create the TextEntry it always get drawn on top of the other
> widgets! how can specify which child widget to be on top of the others
> at run time / or at  compile time.
> regards,
> ferar
>
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> *   ferar druid   *
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>
> #include <gtk/gtk.h>
> #include <string>
> using namespace std;
> GtkWidget* fixedviewo = NULL;
> GtkWidget* FocusEntry = NULL;
> GtkWidget* next_cache_page = NULL;
> GtkWidget* prev_cache_page = NULL;
> gint x=5;
> gint y=5;
> gint x2=5;
>
> gboolean OnLabelButtonPress ( GtkWidget       *widget,
> GdkEventButton  *event,     gpointer         user_data )
> {
>
> //     GList *children = gtk_container_get_children ( GTK_CONTAINER (
> fixedviewo ) );
> //
> //     while ( children )
> //     {
> //         string typeo (g_type_name( GTK_WIDGET_TYPE( children->data ) ));
> //         if(typeo == "GtkButton")
> //         {
> //             gint xx, yy;
> //             gdk_window_get_origin(((GtkWidget*)( children->data
> ))->window,&xx,&yy);
> //             const gchar* labelo = gtk_button_get_label ((GtkButton*)(
> children->data )) ;
> //             printf("Type: %s, Label is: %s\n",typeo.c_str(), labelo);
> //         }
> //
> //         children = g_list_next ( children );
> //     }
>    x+=4;
>    x2+=6;
>    gtk_fixed_move ( GTK_FIXED ( fixedviewo ), next_cache_page, x++, y++ );
>    gtk_fixed_move ( GTK_FIXED ( fixedviewo ), prev_cache_page, x2, y );
>    return FALSE;
> }
>
> int
> main ( int    argc,
>       char **argv )
> {
>    /* Initialization */
>    gtk_init ( &argc, &argv );
>
>    GtkWidget* splash_widget = gtk_window_new ( GTK_WINDOW_TOPLEVEL );
>    gtk_window_set_position ( GTK_WINDOW ( splash_widget ),
> GTK_WIN_POS_CENTER_ALWAYS );
>    gtk_window_set_gravity ( GTK_WINDOW ( splash_widget ),
> GDK_GRAVITY_CENTER );
>    g_signal_connect ( G_OBJECT ( splash_widget ), "destroy", G_CALLBACK
> ( gtk_main_quit ), NULL );
>    GtkWidget* vbox = gtk_vbox_new ( FALSE, 0 );
>    gtk_container_add ( ( GtkContainer* ) splash_widget, vbox );
>    GtkWidget* progress_spitout = gtk_button_new_with_label ( "move the
> buttons up" );
>    g_signal_connect ( ( gpointer ) progress_spitout, "pressed",
>                       G_CALLBACK ( OnLabelButtonPress ),
>                       NULL );
>    fixedviewo = gtk_fixed_new ();
>    gtk_widget_show ( fixedviewo );
>    gtk_container_add ( GTK_CONTAINER ( vbox ), fixedviewo );
>
>    FocusEntry = gtk_entry_new ();
>    gtk_fixed_put ( GTK_FIXED ( fixedviewo ), FocusEntry, 10, 0 );
>
>    prev_cache_page = gtk_button_new_with_label ( "GTK_STOCK_GO_BACK" );
>    gtk_fixed_put ( GTK_FIXED ( fixedviewo ), prev_cache_page, 30, 0 );
> //     gtk_widget_set_size_request ( prev_cache_page, 60, 26 );
>    gtk_widget_show ( prev_cache_page );
>
>    next_cache_page = gtk_button_new_from_stock ( GTK_STOCK_GO_FORWARD );
>    gtk_fixed_put ( GTK_FIXED ( fixedviewo ), next_cache_page, 100, 0 );
> //     gtk_widget_set_size_request ( next_cache_page, 60, 26 );
>    gtk_widget_show ( next_cache_page );
>
>
>
>
>    gtk_container_add ( GTK_CONTAINER ( vbox ), progress_spitout );
>
>    gtk_widget_show_all ( splash_widget );
>
>    gtk_main();
>
>    return ( 0 );
> }
>
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