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[GTK] Example of using GtkBox with label and button


[1]Source code



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#include <gtk/gtk.h>

void on_window_closed (GtkWidget *window, gpointer data)
{
    gtk_main_quit();
}

static void destroy(GtkWidget *widget, gpointer data)
{
    gtk_main_quit();
}

static void button_clicked(GtkWidget *button, gpointer data)
{
    g_print("Button clicked\n");
}

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

    GtkWidget *window, *label, *box, *button ;

    gtk_init(&argc,&argv);

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW (window), "Test GTK");
    gtk_window_set_default_size (GTK_WINDOW (window), 500, 200);

#if 1 //Use gtk3: change 0->1, Use gtk2: keep it is 0

    //Using gtk3
    box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 5);
#else

    //Using gtk2
    box = gtk_vbox_new(GTK_ORIENTATION_VERTICAL, 5);
#endif

    label = gtk_label_new("Label name");
    button = gtk_button_new_with_label ("CLOSE");
    g_signal_connect(GTK_BUTTON(button), "clicked", G_CALLBACK(button_clicked), NULL);
    g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
    g_signal_connect(window, "destroy", G_CALLBACK(destroy), NULL);

    gtk_box_pack_start(GTK_BOX (box), label, TRUE, TRUE, 0);
    gtk_box_pack_start(GTK_BOX (box), button, FALSE, FALSE, 0);
    gtk_container_add(GTK_CONTAINER (window), box);

    gtk_widget_show_all(window);

    gtk_main();

    return 0;
}

[2]How to build

Open terminal and type below command
For gtk2
g++ test1.cpp -o hello-1 `pkg-config --cflags --libs gtk+-2.0`

For gtk3
g++ test1.cpp -o hello-1 `pkg-config --cflags --libs gtk+-3.0`

[3]Error may happened !

Problem
test1.cpp: In function ‘int main(int, char**)’:
test1.cpp:32:50: error: ‘gtk_box_new’ was not declared in this scope

     box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 5);


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g++ test1.cpp -o hello-1 `pkg-config --cflags --libs gtk+-2.0`
test1.cpp: In function ‘int main(int, char**)’:
test1.cpp:32:50: error: ‘gtk_box_new’ was not declared in this scope
     box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 5);

Root cause:
source code is mismatched with gtk version.
Remember, gtk2 is not support API gtk_box_new()

Enjoy.

Keyword: gtk2, gtk3, GtkBox, GtkLabel, GtkButton,
Reference: http://xlpiao.blogspot.com/2016/02/gtk3-example.html

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