On 03/29/2017 07:08 PM, Gautier de Montmollin wrote:
> Various mouse events are working well when handler is set on a Canvas.
> Now I'd like to have a button (purely graphical) with a captive On_Click
> handler.
> If I (mis-)use a sprite for that, the setting of the handler is accepted at
> compilation
>
> App.Sound_switch.On_Click_Handler
> (On_sound_switch_click'Unrestricted_Access);
>
> but seems ineffective. Probably I'm doing a Bad Thing.
> Would another kind of graphical object be better for the job, or is it more
> advisable to capture clicks on the whole canvas and locate eventual clicks in
> the button area (easy, but less elegant) ?
I don't know if this helps, but if we follow the derivations back:
type Button_Type is new Gnoga.Gui.View.View_Base_Type with private;
...
type View_Base_Type is new Gnoga.Gui.Element.Element_Type with private;
...
type Element_Type is new Gnoga.Gui.Base.Base_Type with private;
...
procedure Background_Image (Element : in out Element_Type;
Value : in String);
function Background_Image (Element : Element_Type) return String;
-- proper syntax is "url(...)" | "" to clear
So presumably you can have a button with an image instead of text.
--
Jeff Carter
"I fart in your general direction."
Monty Python & the Holy Grail
05
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