doc/vala/interfaces.xml

   1 <?xml version="1.0"?>
   2 <section id="interfaces">
   3         <h>Interfaces</h>
   4         <p>Interfaces can be implemented by classes to provide functionality with a common interface. Each class
   5         can implement multiple interface and interfaces can require other interfaces to be implemented.</p>
   6         <section id="declaration">
   7                 <h>Interface declarations</h>
   8                 <blockcode>
   9                 public interface InterfaceName : RequiredInterface &lt;optional&gt;
  10                 {
  11                         &lt;interface members&gt;
  12                 }
  13                 </blockcode>
  14         </section>
  15         <section id="methods">
  16                 <h>Methods</h>
  17                 <p>Interfaces can contain abstract and non abstract methods.</p>
  18                 <blockcode>
  19                 public abstract void MethodName ();
  20                 public void MethodName2 ()
  21                 {
  22                         &lt;Implementation&gt;
  23                 }
  24                 </blockcode>
  25         </section>
  26         <section id="delegates">
  27                 <h>Delegates</h>
  28                 <p>Interfaces can also contain delegates</p>
  29                 <blockcode>
  30                 public delegate void DelegateName (void* data);
  31                 </blockcode>
  32         </section>
  33         <section id="signals">
  34                 <h>Signals</h>
  35                 <p>Signals are also supported by interfaces</p>
  36                 <blockcode>
  37                 public signal void SignalName ();
  38                 </blockcode>
  39         </section>
  40 </section>
  41