* Problems with Glade 3, and Ada drawing
@ 2014-01-14 8:33 ldries46
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From: ldries46 @ 2014-01-14 8:33 UTC (permalink / raw)
I am trying to draw a grid on Gtk_Drawing Area. I want that drawing to
appear when then program starts before anything is done.
I can draw that grid and see it but whenever the program redraws the window
it disappears as a whole or in some cases partly. As various sources I found
out that I have to act on the draw signal. As I build my GUI with Glade 3 I
thought I could connect the drawing signal with:
Register_Handler
(Builder => Builder,
Handler_Name => "On_Area_Draw", -- from XML file <signal handler=..>
Handler => Sudoku_Callbacks.On_Area_Draw'Access);
Where I coupled "On_Area_Draw" in Glade with the draw signal in the
Gtk_Drawing_Area. Although This was carried out case Sensitive the program
aborted. The most likely reason therefor is that the handler procedure was:
procedure On_Area_Draw (Object : access Gtkada_Builder_Record'Class);
where it should have been
function On_Area_Draw (Object : access Gtkada_Builder_Record'Class; Context
: Cairo.Cairo_Context) return boolean;
Using the last results in aborting the compilation.
The question now is how should I connect the draw signal to which
function/procedure to get a correct working program?
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