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Types
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EventObject.cs
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EventObject.cs
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using
System
;
using
System
.
Collections
;
using
System
.
Diagnostics
;
using
System
.
Reflection
;
namespace
Python
.
Runtime
{
/// <summary>
/// Implements a Python descriptor type that provides access to CLR events.
/// </summary>
[
Serializable
]
internal
class
EventObject
:
ExtensionType
{
internal
readonly
string
name
;
internal
readonly
EventHandlerCollection
reg
;
public
EventObject
(
EventInfo
info
)
{
Debug
.
Assert
(
!
info
.
AddMethod
.
IsStatic
)
;
this
.
name
=
info
.
Name
;
this
.
reg
=
new
EventHandlerCollection
(
info
)
;
}
/// <summary>
/// Descriptor __get__ implementation. A getattr on an event returns
/// a "bound" event that keeps a reference to the object instance.
/// </summary>
public
static
NewReference
tp_descr_get
(
BorrowedReference
ds
,
BorrowedReference
ob
,
BorrowedReference
tp
)
{
var
self
=
GetManagedObject
(
ds
)
as
EventObject
;
if
(
self
==
null
)
{
return
Exceptions
.
RaiseTypeError
(
"invalid argument"
)
;
}
if
(
ob
==
null
)
{
return
new
NewReference
(
ds
)
;
}
if
(
Runtime
.
PyObject_IsInstance
(
ob
,
tp
)
<
1
)
{
return
Exceptions
.
RaiseTypeError
(
"invalid argument"
)
;
}
return
new
EventBinding
(
self
.
name
,
self
.
reg
,
new
PyObject
(
ob
)
)
.
Alloc
(
)
;
}
/// <summary>
/// Descriptor __set__ implementation. This actually never allows you
/// to set anything; it exists solely to support the '+=' spelling of
/// event handler registration. The reason is that given code like:
/// 'ob.SomeEvent += method', Python will attempt to set the attribute
/// SomeEvent on ob to the result of the '+=' operation.
/// </summary>
public
static
int
tp_descr_set
(
BorrowedReference
ds
,
BorrowedReference
ob
,
BorrowedReference
val
)
{
if
(
GetManagedObject
(
val
)
is
EventBinding
_
)
{
return
0
;
}
Exceptions
.
RaiseTypeError
(
"cannot set event attributes"
)
;
return
-
1
;
}
/// <summary>
/// Descriptor __repr__ implementation.
/// </summary>
public
static
NewReference
tp_repr
(
BorrowedReference
ob
)
{
var
self
=
(
EventObject
)
GetManagedObject
(
ob
)
!
;
return
Runtime
.
PyString_FromString
(
$
"<event '
{
self
.
name
}
'>"
)
;
}
}
internal
class
Handler
{
public
readonly
nint
hash
;
public
readonly
Delegate
del
;
public
Handler
(
nint
hash
,
Delegate
d
)
{
this
.
hash
=
hash
;
this
.
del
=
d
;
}
}
}
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