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From: frebourg@cui.unige.ch (FREBOURG Fabrice)
Subject: Mapping between Ada95 (AppletMagic from Intermetrics Inc) and Java
Date: 1997/01/10
Message-ID: <5b62s2$80g@uni2f.unige.ch>#1/1
X-Deja-AN: 209049589
organization: University of Geneva, Switzerland
reply-to: frebourg@cui.unige.ch
newsgroups: comp.lang.ada
Date: 1997-01-10T00:00:00+00:00
List-Id: <comp.lang.ada>


Hello, 

I've a problem to execute an applet with Ada95. (cross-compilator AppletMagic)
I've created a quit button on a frame. When I'm clicking on such a button, I must 
normally trigger is its associate operation. This operation is called action.

If I'm cliking on my button, there is nothing. It's as if my function action wasn't
take by the event manager. Do you know how I can lay my action function to the event
manager in order to execute an exit of my applet. (In Ada, I've got any problem to compile.)

In Java, here is the following code:

public boolean action(Event e,Object arg) {

if ("Quit".equals(arg)) {
dispose();
System.exit(0);
return true;
}
return false;
} // action

other way

private Button quit_button;
.
.
.

public boolean action(Event e,Object arg) {

if (e.target == quit_button ) then
dispose();
System.exit(0);
return true;
} // end if
return false;
} // action

In Ada 95, I'm suggesting this code which is correct, but It does nothing:

with interfaces.java; use interfaces.java;
with java.lang; use java.lang;
with java.lang.String; use java.lang.String;
with java.awt.Frame; use java.awt.Frame;
with java.awt.Event; use java.awt.Event;
with java.awt.Container; use java.awt.Container;
with java.awt.Component; use java.awt.Component;
with java.awt.Button; use java.awt.Button;
.
.
.

	function action(Obj : access Button_Obj;
        		evt : Event_Ptr;
        		what : Object_Ptr)
			return boolean is
            
        Quit:constant String_Ptr:=+"Quit";

    	begin
          
          if ( Quit.all = what.all )then           
             exit_op(0);
             return true;
          end if;

          return false;
 	end action;


other way

quit_button:	Button_Ptr:= new_Button(+"Quit");
.
.
.

	function action(Obj : access Button_Obj;
        		evt : Event_Ptr;
        		what : Object_Ptr)
			return boolean is
             
        begin
          if  evt.target = quit_button  then
 -- Problem: it doesn't exist such "=" operator between Object_Ptr
             exit_op(0);
             return true;
          end if;

          return false;
 	end action;