Hi,
Here's what I do:
In your widget creation code, "turn on" the events you want to see for the
widget:
gtk_widget_set_events (widget, gtk_widget_get_events (widget)
| GDK_BUTTON_PRESS_MASK
| GDK_BUTTON_RELEASE_MASK
| GDK_POINTER_MOTION_MASK
| GDK_POINTER_MOTION_HINT_MASK
| GDK_BUTTON_RELEASE_MASK);
And connect the signal to your drag event:
g_signal_connect (widget, "motion_notify_event",
G_CALLBACK
(M_N_callback), (gpointer) data);
You didn't provide your complete code so it's a bit difficult to tell
exactly what's going on, but:
1. you should call gtk_widget_set_events() before the widget is
realized, setting all events you wish to be enabled for the widget in
question;
2. n.b.: take note of the gtk_widget_get_events() call - default
events that automatically come with the widget are, thus, not lost;
3. unless you need to add events after a widget has been realized, use
of gtk_widget_add_events() is unnecessary.
One other very important note. In your callback, the absolute last
executing piece of code before returning to the main loop should/must be:
gdk_window_get_pointer(gdkWindow, &x, &y, &state);
Even though you don't use the resulting values, this call tells the main
loop (managing the motion events) that the callback is done with its work
and is ready to be called again by the main loop.
This is essentially the synchronization hook used to connect back to the
HINT motion type event; as long as your callback has been called and
gdk_window_get_pointer() hasn't been called, your callback won't get called
again. OR - From the mainloop perspective: once your callback has been
called, all succeeding user motion events are "eaten up" and not passed on
until gdk_window_get_pointer() has been called.
cheers,
richard
On 7/5/07, Dean McCullough <[EMAIL PROTECTED]> wrote:
I am trying to write a tool that uses mouse button presses and motion to
do something useful. The mouse press is working, but I never get into
the routine from a mouse motion event any action appears to be captured
by the button press event). The add event and signal connect calls I am
using are below. Is there an obvious error? (I saw a recommendation to
use GDK_POINTER_MOTION_HINT_MASK rather than GDK_POINTER_MOTION_MASK to
keep the application from bogging down.
-------------------------------------------------------------------------
gtk_widget_add_events(GTK_WIDGET(view),
GDK_POINTER_MOTION_HINT_MASK);
gtk_widget_add_events(GTK_WIDGET(view),
GDK_BUTTON_PRESS_MASK);
gtk_signal_connect(GTK_OBJECT(view), "motion_notify_event",
GTK_SIGNAL_FUNC(event_mv), NULL);
gtk_signal_connect(GTK_OBJECT(view), "button_press_event",
GTK_SIGNAL_FUNC(event_cb), NULL);
--
-----------------
Dean P McCullough
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