Re: Middle mouse button map to a double click

[José Geraldo Alves Brito Neto <jgabrito iq usp br>]

From: Alex Short <alex_short@payanybill.com>
Subject: Middle mouse button map to a double click
Date: Tue, 01 Aug 2000 11:33:27 -0400

> I was just wondering if anyone knows how to map the middle mouse button
> to a double click under linux.
> 

Hi,

With GTK+, you can capture the middle mouse button click event and
synthetize a double-click event for the left one. On the program I
attached to this message, I do this with the GtkCList widget.

[]s



#include <gtk/gtk.h>
#include <gdk/gdk.h>


gint
clist_event (GtkWidget *wid,
	     GdkEventAny *ev,
	     gpointer data) {
  GdkEventButton *btev = (GdkEventButton *)ev;

  if ((ev->type == GDK_BUTTON_PRESS) &&
      (btev->button == 2)) {
    /* Middle mouse button pressed. Simply ignore the event. */
    return 1;
  }

  if ((ev->type == GDK_BUTTON_RELEASE) &&
      (btev->button == 2)) {
      GdkEventButton my_event;
      /* Middle mouse button has just been released. This signals a
       click. Now, synthetize a 2BUTTON_PRESS event for the left
       button */
      g_memmove (&my_event, btev, sizeof (GdkEventButton));
      my_event.send_event = TRUE;
      my_event.button = 1;
      gdk_window_ref (my_event.window);

      my_event.time += 10; /* 10ms ?? */
      my_event.type = GDK_2BUTTON_PRESS;
      gtk_widget_event (wid, (GdkEvent *)(&my_event));

      gdk_window_unref (my_event.window);
      return 1;
  }

  if ((ev->type == GDK_2BUTTON_PRESS) &&
      (btev->button == 1)) {
    gint r,c;
    gchar *text;

    /* Double click on left button detected. Show text. */

    gtk_clist_get_selection_info (GTK_CLIST(wid), btev->x, btev->y,
				  &r, &c);
    if (gtk_clist_get_text (GTK_CLIST(wid), r, c, &text)) 
      g_print ("Double click on row=%d, col=%d, text=\"%s\"\n", r, c, text);

    return 0;
  }

  return 0;
}


gint 
main (gint argc, gchar **argv) {
  GtkWidget *win;
  GtkWidget *clist;

  gtk_init (&argc, &argv);
  
  win = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_default_size (GTK_WINDOW(win), 100, 100);
  gtk_signal_connect (GTK_OBJECT(win), "delete_event",
		      GTK_SIGNAL_FUNC(gtk_main_quit), NULL);

  clist = gtk_clist_new (1);
  gtk_signal_connect (GTK_OBJECT(clist), "event",
		      GTK_SIGNAL_FUNC(clist_event), NULL);
  {
    gchar *text[] = { "text 1", "text 2", "text 3" };
    gint n = sizeof(text)/sizeof (gchar *);
    gint ind;
    
    for (ind=0; ind<n; ind++) 
      gtk_clist_append (GTK_CLIST(clist), text + ind);
  }
  gtk_container_add (GTK_CONTAINER(win), clist);
  gtk_widget_show (clist);

  gtk_widget_show (win);
			 
  gtk_main();

  return 0;
}