The state member in GdkEventButton for the button-press/release events contains
flag bits that specify which mouse button is operated and also any keyboard
shift/ctrl/alt modifier bits. I have tried button-press-event on several widget
types, but in all cases the modifier bit GDK_BUTTON1_MASK or GDK_BUTTON2_MASK
is not set on button-press. It is however set in the button-release-event.
If a mouse button is held down while pressing keys the state in GdkEventKey
shows the correct GDK_BUTTON1_MASK or GDK_BUTTON2_MASK.
I need to know the mouse button pressed on button-press.
The program below shows this for a top window widget.
static gboolean buttonpresscallback ( GtkWidget * w,
GdkEventButton * event,
char * data )
{
printf ( " mousebuttonDOWN (x,y)=(%d,%d)state %x\n" ,
(int)event->x , (int)event->y , event->state ) ;
return false;
}
static gboolean buttonreleasecallback ( GtkWidget * w,
GdkEventButton * event,
char * data )
{
printf ( " mousebuttonUP (x,y)=(%d,%d)state %x\n" ,
(int)event->x , (int)event->y , event->state ) ;
return false;
}
static gboolean keypresscallback ( GtkWidget * w,
GdkEventKey *event,
char * data )
{
printf ( " key PRESS val=%x state=%x\n" , event->keyval , event->state ) ;
return false;
}
static gboolean keyreleasecallback ( GtkWidget *eventbox,
GdkEventKey *event,
char * data )
{
printf ( " key RELEASE val=%x state=%x\n" , event->keyval , event->state ) ;
return false;
}
int main ( int argc , char * argv[] )
{
gtk_init(&argc, &argv);
GtkWidget * window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
gtk_window_set_default_size(GTK_WINDOW(window), 250, 180);
gtk_window_set_title(GTK_WINDOW(window), "Testing");
gtk_widget_add_events (window , GDK_BUTTON_PRESS_MASK );
g_signal_connect (window, "button-press-event",
G_CALLBACK (buttonpresscallback), NULL ) ;
gtk_widget_add_events (window, GDK_BUTTON_RELEASE_MASK );
g_signal_connect (window, "button-release-event",
G_CALLBACK (buttonreleasecallback), NULL ) ;
gtk_widget_add_events (window, GDK_KEY_PRESS_MASK );
g_signal_connect ( window, "key-press-event",
G_CALLBACK (keypresscallback), NULL ) ;
gtk_widget_add_events (window, GDK_KEY_RELEASE_MASK );
g_signal_connect ( window, "key-release-event",
G_CALLBACK (keyreleasecallback), NULL ) ;
g_signal_connect(window, "destroy",
G_CALLBACK (gtk_main_quit), NULL);
gtk_widget_show_all(window);
gtk_main();
return 0;
}
Am I doing something wrong?
I have a two-button mouse and observed that the right-mouse corresponds to
GDK_BUTTON3_MASK, not GDK_BUTTON2_MASK that I expected. However, when I
mistakenly pressed left and right button together I received the result
GDK_BUTTON2 on button-release. Is this the way it is? What about bit mask and
button correspondence for a 5-button mouse (if such animal exists in the real
world)?
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