On 2024-08-14 13:42, Gavin McCord wrote:
On Tue, 13 Aug 2024 22:29:59 +0200, Dmitry A. Kazakov wrote:
On 2024-08-13 13:37, Gavin McCord wrote:
I have a custom handler used when I update the Text_Buffer:
Button_Callback.Connect
(Update_Button, "clicked", Update_Clicked'Access,
Buffer_To_Pass);
That works fine so I was imagining something similar might be possible,
but I've run through various permuations of records and access types
but not yet got a working callback.
Any help gratefully received (I can post the full code if that's
useful).
Something like this:
package Event_Handlers is
new Gtk.Handlers.User_Return_Callback
( GObject_Record,
Boolean, User_Data_Type
);
function On_Button_Press
( Object : access GObject_Record'Class;
Event : Gdk_Event; Data : User_Data_Type
) return Boolean;
View.Set_Events (View.Get_Events or Button_Press_Mask);
Event_Handlers.Connect ( View,
"button-press-event",
Event_Handlers.To_Marshaller (On_Button_Press'Access),
Data
);
Thank you. That allows me to pass a record of the buffer.
As a general advice. Usually you have a custom widget derived from Gtk_Grid_Record servicing as the main window.
type Main_Window_Record is new Gtk_Grid_Record with record
Button : Gtk_Button;
Text_View : Gtk_Text_View;
Buffer : Gtk_Text_Buffer;
...
type Main_Window is access all Main_Window_Record'Class;
Main_Window you pass to all handlers, so that you always have a full
context in any of them.
There's only one other thing.
If I try to check the Event I get another error, such as
function On_Button_Press
[skipped lines]
if Event.The_Type = Gdk_2button_Press then
Put_Line ("double-click");
end if;
Attempting to compile that gives me
error: cannot reference discriminant of unchecked union
case Get_Event_Type (Event) is
when Button_Press =>
...
when Gdk_2Button_Press | Gdk_3Button_Press =>
...
when Key_Press =>
case Get_Key_Val (Event) is
when GDK_Up | GDK_KP_Up =>
...
when GDK_Down | GDK_KP_Down =>
...
end case;
...
when others =>
...
end case;
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
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