/** simplednd.c **/
#include <gnome.h>

gint eventDelete(GtkWidget *widget,
        GdkEvent *event,gpointer data);
gint eventDestroy(GtkWidget *widget,
        GdkEvent *event,gpointer data);
void sendCallback(GtkWidget *widget,
        GdkDragContext *context,
        GtkSelectionData *selection,guint info,guint time);
void receiveCallback(GtkWidget *widget,
        GdkDragContext *context,
        gint x,gint y,GtkSelectionData *selection,
        guint info,guint time);
void packSendingButton(GtkWidget *box,gchar *text);
void packReceivingButton(GtkWidget *box,gchar *text);

int main(int argc,char *argv[])
{
    GtkWidget *app;
    GtkWidget *box;

    gnome_init("simplednd","1.0",argc,argv);
    app = gnome_app_new("simplednd","Simple DND");
    gtk_signal_connect(GTK_OBJECT(app),"delete_event",
            GTK_SIGNAL_FUNC(eventDelete),NULL);
    gtk_signal_connect(GTK_OBJECT(app),"destroy",
            GTK_SIGNAL_FUNC(eventDestroy), NULL);

    box = gtk_hbox_new(TRUE,0);
    gnome_app_set_contents(GNOME_APP(app),box);

    packSendingButton(box,"Left Source Text");
    packReceivingButton(box,"Destination Window");
    packSendingButton(box,"Right Source Text");

    gtk_container_set_border_width(GTK_CONTAINER(app),25);
    gtk_widget_show_all(app);
    gtk_main();
    exit(0);
}
void packSendingButton(GtkWidget *box,gchar *text)
{
    GtkWidget *button;
    static GtkTargetEntry target = { "text/plain",0,0 };

    button = gtk_button_new_with_label(text);
    gtk_box_pack_start(GTK_BOX(box),button,TRUE,FALSE,0);

    gtk_signal_connect(GTK_OBJECT(button),"drag_data_get",
            GTK_SIGNAL_FUNC(sendCallback),NULL);
    gtk_drag_source_set(button,GDK_BUTTON1_MASK,&target,
            1,GDK_ACTION_COPY);
}
void packReceivingButton(GtkWidget *box,gchar *text)
{
    GtkWidget *button;
    static GtkTargetEntry target = { "text/plain",0,0 };

    button = gtk_button_new_with_label(text);
    gtk_box_pack_start(GTK_BOX(box),button,TRUE,FALSE,0);

    gtk_signal_connect(GTK_OBJECT(button),
            "drag_data_received",
            GTK_SIGNAL_FUNC(receiveCallback),NULL);
    gtk_drag_dest_set(button,
            GTK_DEST_DEFAULT_MOTION |
            GTK_DEST_DEFAULT_HIGHLIGHT |
            GTK_DEST_DEFAULT_DROP,
            &target,1,
            GDK_ACTION_COPY);
}
void sendCallback(GtkWidget *widget,
        GdkDragContext *context,
        GtkSelectionData *selection,guint info,guint time)
{
    gchar *ascii;
    GtkWidget *label;

    label = GTK_BUTTON(widget)->child;
    gtk_label_get(GTK_LABEL(label),&ascii);
    gtk_selection_data_set(selection,selection->target,
            8,ascii,strlen(ascii));
}
void receiveCallback(GtkWidget *widget,
        GdkDragContext *context,
        gint x,gint y,GtkSelectionData *selection,
        guint info,guint time)
{
    GtkWidget *label;

    label = GTK_BUTTON(widget)->child;
    gtk_label_set_text(GTK_LABEL(label),selection->data);
}
gint eventDelete(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    return(FALSE);
}
gint eventDestroy(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    gtk_main_quit();
    return(0);
}