Re: gtk_widget_size_allocate(): attempt to allocate widget with width -19 and height 1

[cecashon aol com]

 Hi Franco,


I see "margin-left" is deprecated since version 3.12.

This might work. If you set the container margin of the grid and then individually place your widgets in the 
locations that you want them,,, hopefully no warnings. I don't get any warnings on GTK3.18. Will something 
like this work?

Eric

/*
   gcc -Wall expander1.c -o expander1 `pkg-config --cflags --libs gtk+-3.0`
   Tested with GTK3.18 on Ubuntu16.04
*/
#include<gtk/gtk.h>

int main(int argc, char *argv[])
  {
    gtk_init (&argc, &argv);

    GtkWidget *window=gtk_window_new (GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window), "Expander");
    gtk_window_set_default_size(GTK_WINDOW(window), 200, 200);
    gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
    g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);

    GtkWidget *check1=gtk_check_button_new_with_label("Check1");
    gtk_widget_set_hexpand(check1, TRUE);
    gtk_widget_set_vexpand(check1, TRUE);

    GtkWidget *check2=gtk_check_button_new_with_label("Check2");
    gtk_widget_set_hexpand(check2, TRUE);
    gtk_widget_set_vexpand(check2, TRUE);
    gtk_widget_set_halign(check2, GTK_ALIGN_CENTER);

    GtkWidget *label=gtk_label_new("Label");
    gtk_widget_set_hexpand(label, TRUE); 
    gtk_widget_set_vexpand(label, TRUE);  

    GtkWidget *grid=gtk_grid_new();
    gtk_container_set_border_width(GTK_CONTAINER(grid), 20);
    gtk_grid_attach(GTK_GRID(grid), check1, 0, 0, 1, 1);
    gtk_grid_attach(GTK_GRID(grid), check2, 0, 1, 1, 1);
    gtk_grid_attach(GTK_GRID(grid), label, 0, 2, 1, 1);

    GtkWidget *expander=gtk_expander_new("Expander");
    gtk_container_add(GTK_CONTAINER(expander), grid);  

    gtk_container_add(GTK_CONTAINER(window), expander);

    gtk_widget_show_all(window);

    gtk_main();

    return 0;
  }