Jeffrey's solution is probably the cleanest. Some alternates:
Rosen Technique:
Change your declaration to:
*****************************************************************
type Default_View_Type;
type Button_With_Parent(Parent : not null access Default_View_Type)
is new Gnoga.Gui.Element.Common.Button_Type with null record;
type Default_View_Type is new Gnoga.Gui.View.Grid.Grid_View_Type with
record
Label_Text : Gnoga.Gui.View.View_Type;
Click_Button : Button_With_Parent(Default_View_Type'Access);
end record;
*****************************************************************
And then your click handler to:
*****************************************************************
procedure On_Click (Object : in out Gnoga.Gui.Base.Base_Type'Class) is
Button : Button_With_Parent renames Button_With_Parent(Object);
View : Default_View_Type renames Button.Parent.all;
begin
View.Label_Text.Put_Line ("Click");
end On_Click;
*****************************************************************
another option is an event listener paradigm, but it is probably too
complex for
something like this. There is a write up at:
https://sourceforge.net/p/gnoga/code/ci/dev_1.3/tree/docs/articles/event_listeners.txt
NOTE: noticed that my last name was incorrectly spelled. It is Breeden.
This method involves making the button an event generator and the view a
listener. It's not very
clean though. Jeff's solution seems like the best to me.
On Fri, Dec 22, 2017 at 5:29 AM, Pascal via Gnoga-list <
gnoga-list@lists.sourceforge.net> wrote:
> Hello,
>
> After declaration of my view:
> type Default_View_Type is new Gnoga.Gui.View.Grid.Grid_View_Type with
> record
> Label_Text : Gnoga.Gui.View.View_Type;
> Click_Button : Gnoga.Gui.Element.Common.Button_Type;
> end record;
>
> and creation of my objects:
> Gnoga.Gui.View.Grid.Grid_View_Type (Grid).Create (Parent, Layout,
> Fill_Parent, Set_Sizes, ID);
> Grid.Label_Text.Create (Grid.Panel (1, 1).all);
> Grid.Click_Button.Create (Grid.Panel (1, 2).all, "Click Me");
>
> My button controller is:
> procedure On_Click (Object : in out Gnoga.Gui.Base.Base_Type'Class) is
> -- View : Logo.View.Default_View_Access :=
> -- Logo.View.Default_View_Access (Object.Parent);
> begin
> -- View.Label_Text.Put_Line ("Click");
> gnoga.log(ada.Tags.Expanded_Name(Object.Parent'tag));
> end On_Click;
>
> I've got a CE:
> raised CONSTRAINT_ERROR : logo-controller.adb:14 tag check failed
>
> because of object parent's type:
> GNOGA.GUI.VIEW.VIEW_BASE_TYPE
>
> How to get the true parent that is Default_View_Type and then access to
> Label_Text?
>
> Thanks for help, Pascal.
> http://blady.pagesperso-orange.fr
>
>
>
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