[Gtk-sharp-list] How to set the fields of properties of Gdk.Event

Christian Hoff christian_hoff at gmx.net
Tue Dec 8 12:53:50 EST 2009

Matt Guo wrote:
> I want to send a mouse event to a given window. The C code for this
> would be like:
> bool SendMousePress (MouseButton type, x, y) {
>   GdkEvent* event = gdk_event_new(GDK_BUTTON_PRESS);
>   event->button.button = type == LEFT ? 1 : (type == MIDDLE ? 2 : 3);
>   event->button.x = x;
>   event->button.y = y;
>   ... //other event fields setting
>   gdk_event_put(event);
>   gdk_event_free(event);
> }
> The problem I have now is that though I can replace "gdk_event_new",
> "gdk_event_put" and "gdk_event_free" with Gdk.EventHelper.New,
> Gdk.EventHelper.Put
> and Gdk.EventHelper.Free, but how can I set the event fields with
> gdk-sharp? Since all properties in the Gdk.Event class are read-only.
Thanks to Mike, the properties are now read-write in Gtk# trunk. If you 
want to do the same in 2.12, try something like:

        [StructLayout (LayoutKind.Sequential)]
        struct NativeEventButtonStruct {
            EventType type;
            IntPtr window;
            sbyte send_event;
            public uint time;
            public double x;
            public double y;
            public IntPtr axes;
            public uint state;
            public uint button;
            public IntPtr device;
            public double x_root;
            public double y_root;

          NativeEventButtonSTruct native_event_button = new 
NativeEventButtonStruct ();
          native_event_button.x/y = ...;
          IntPtr struct_ptr =Glib.Marshaller.Malloc (sizeof 
          Marshal.StructureToPtr (strct_ptr, native_event_button);
          EventButton evnt = new EventButton (struct_ptr);

	Gdk.EventHelper.Put (evnt);
	Free (evnt);

Hope this helps to get you started,


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