vala/valasignaltype.vala

   1 /* valasignaltype.vala
   2  *
   3  * Copyright (C) 2007-2009  Jürg Billeter
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  18  *
  19  * Author:
  20  *      Jürg Billeter <j@bitron.ch>
  21  */
  22
  23 using GLib;
  24
  25 /**
  26  * The type of a signal referencea.
  27  */
  28 public class Vala.SignalType : DataType {
  29         public Signal signal_symbol { get; set; }
  30
  31         Method? connect_method;
  32         Method? disconnect_method;
  33
  34         public SignalType (Signal signal_symbol) {
  35                 this.signal_symbol = signal_symbol;
  36         }
  37
  38         public override bool is_invokable () {
  39                 return true;
  40         }
  41
  42         public override DataType? get_return_type () {
  43                 return signal_symbol.return_type;
  44         }
  45
  46         public override List<FormalParameter>? get_parameters () {
  47                 return signal_symbol.get_parameters ();
  48         }
  49
  50         public override DataType copy () {
  51                 return new SignalType (signal_symbol);
  52         }
  53
  54         public override bool compatible (DataType target_type) {
  55                 return false;
  56         }
  57
  58         public override string to_qualified_string (Scope? scope) {
  59                 return signal_symbol.get_full_name ();
  60         }
  61
  62         DelegateType get_handler_type () {
  63                 var sender_type = new ObjectType ((ObjectTypeSymbol) signal_symbol.parent_symbol);
  64                 var result = new DelegateType (signal_symbol.get_delegate (sender_type, this));
  65                 result.value_owned = true;
  66                 return result;
  67         }
  68
  69         Method get_connect_method () {
  70                 if (connect_method == null) {
  71                         connect_method = new Method ("connect", new VoidType ());
  72                         connect_method.access = SymbolAccessibility.PUBLIC;
  73                         connect_method.external = true;
  74                         connect_method.owner = signal_symbol.scope;
  75                         connect_method.add_parameter (new FormalParameter ("handler", get_handler_type ()));
  76                 }
  77                 return connect_method;
  78         }
  79
  80         Method get_disconnect_method () {
  81                 if (disconnect_method == null) {
  82                         disconnect_method = new Method ("disconnect", new VoidType ());
  83                         disconnect_method.access = SymbolAccessibility.PUBLIC;
  84                         disconnect_method.external = true;
  85                         disconnect_method.owner = signal_symbol.scope;
  86                         disconnect_method.add_parameter (new FormalParameter ("handler", get_handler_type ()));
  87                 }
  88                 return disconnect_method;
  89         }
  90
  91         public override Symbol? get_member (string member_name) {
  92                 if (member_name == "connect") {
  93                         return get_connect_method ();
  94                 } else if (member_name == "disconnect") {
  95                         return get_disconnect_method ();
  96                 }
  97                 return null;
  98         }
  99
 100         public override List<Symbol> get_symbols () {
 101                 var symbols = new ArrayList<Symbol> ();
 102                 symbols.add (signal_symbol);
 103                 return symbols;
 104         }
 105 }