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kevingosse
/
NavigationService.cs
Secret
Created
Feb 21, 2016
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NavigationService.cs
public
class
NavigationService
:
IDisposable
{
public
NavigationService
()
{
SystemNavigationManager
.
GetForCurrentView
().
BackRequested
+=
this
.
OnBackRequested
;
}
public
event
EventHandler
<
BackRequestedEventArgs
>
BackRequested
;
public
void
SubscribeBefore
(
EventHandler
<
BackRequestedEventArgs
>
handler
)
{
this
.
BackRequested
=
(
EventHandler
<
BackRequestedEventArgs
>)
Delegate
.
Combine
(
handler
,
this
.
BackRequested
);
}
public
void
Dispose
()
{
SystemNavigationManager
.
GetForCurrentView
().
BackRequested
-=
this
.
OnBackRequested
;
}
private
void
OnBackRequested
(
object
sender
,
BackRequestedEventArgs
e
)
{
this
.
BackRequested
?
.
Invoke
(
sender
,
e
);
if
(
!
e
.
Handled
)
{
Debug
.
WriteLine
(
"
Back handled by navigation service
"
);
e
.
Handled
=
true
;
this
.
GoBack
();
}
}
private
void
GoBack
()
{
var
rootFrame
=
Window
.
Current
.
Content
as
Frame
;
if
(
rootFrame
?
.
CanGoBack
==
true
)
{
rootFrame
.
GoBack
();
}
}
}
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