using System;
namespace Python.Runtime
{
///
/// Implements a Python event binding type, similar to a method binding.
///
internal class EventBinding : ExtensionType
{
private EventObject e;
private IntPtr target;
public EventBinding(EventObject e, IntPtr target)
{
Runtime.XIncref(target);
this.target = target;
this.e = e;
}
///
/// EventBinding += operator implementation.
///
public static IntPtr nb_inplace_add(IntPtr ob, IntPtr arg)
{
var self = (EventBinding)GetManagedObject(ob);
if (Runtime.PyCallable_Check(arg) < 1)
{
Exceptions.SetError(Exceptions.TypeError, "event handlers must be callable");
return IntPtr.Zero;
}
if (!self.e.AddEventHandler(self.target, arg))
{
return IntPtr.Zero;
}
Runtime.XIncref(self.pyHandle);
return self.pyHandle;
}
///
/// EventBinding -= operator implementation.
///
public static IntPtr nb_inplace_subtract(IntPtr ob, IntPtr arg)
{
var self = (EventBinding)GetManagedObject(ob);
if (Runtime.PyCallable_Check(arg) < 1)
{
Exceptions.SetError(Exceptions.TypeError, "invalid event handler");
return IntPtr.Zero;
}
if (!self.e.RemoveEventHandler(self.target, arg))
{
return IntPtr.Zero;
}
Runtime.XIncref(self.pyHandle);
return self.pyHandle;
}
///
/// EventBinding __hash__ implementation.
///
public static IntPtr tp_hash(IntPtr ob)
{
var self = (EventBinding)GetManagedObject(ob);
long x = 0;
long y = 0;
if (self.target != IntPtr.Zero)
{
x = Runtime.PyObject_Hash(self.target).ToInt64();
if (x == -1)
{
return new IntPtr(-1);
}
}
y = Runtime.PyObject_Hash(self.e.pyHandle).ToInt64();
if (y == -1)
{
return new IntPtr(-1);
}
x ^= y;
if (x == -1)
{
x = -1;
}
return new IntPtr(x);
}
///
/// EventBinding __repr__ implementation.
///
public static IntPtr tp_repr(IntPtr ob)
{
var self = (EventBinding)GetManagedObject(ob);
string type = self.target == IntPtr.Zero ? "unbound" : "bound";
string s = string.Format("<{0} event '{1}'>", type, self.e.name);
return Runtime.PyString_FromString(s);
}
///
/// EventBinding dealloc implementation.
///
public new static void tp_dealloc(IntPtr ob)
{
var self = (EventBinding)GetManagedObject(ob);
Runtime.XDecref(self.target);
ExtensionType.FinalizeObject(self);
}
}
}