/*
@brief タイマ
*/

Namespace System
Namespace Threading

Delegate Sub TimerCallback ( state As Object )

Class Timer
	Sub _Initialize( callback As TimerCallback, state As Object, dueTime As Int64, period As Int64 )
		timeGetDevCaps(tc,SizeOf(TIMECAPS))
		This.state = state
		This.callback = callback
		This._Change(dueTime,period)
	End Sub

	Sub _Change(dueTime As Int64, period As Int64 )
		If This.id Then
			timeKillEvent(This.id)
			This.id = 0
		End If
		Select Case dueTime As Long
			Case 0
				'ノータイムで開始
				Detail.TimerProc_Impl(This.id,0,ObjPtr(This) As ULONG_PTR,0,0)
			Case -1
				'タイマーは開始されない
				Exit Sub
			Case Else 
				'ディレイ後に開始
				This.id = timeSetEvent(dueTime As DWord,tc.wPeriodMin,AddressOf(Detail.TimerProc_Impl),ObjPtr(This) As ULONG_PTR,TIME_ONESHOT or TIME_CALLBACK_FUNCTION)
		End Select

		This.dueTime = dueTime
		This.period = period
	End Sub

Public
	'Timer クラスの新しいインスタンスを初期化します。
	Sub Timer ( callback As TimerCallback, state As Object, dueTime As Long, period As Long )
		This._Initialize(callback,state,dueTime As Int64,period As Int64)
	End Sub
	Sub Timer ( callback As TimerCallback, state As Object, dueTime As Int64, period As Int64 )
		This._Initialize(callback,state,dueTime As Int64,period As Int64)
	End Sub
	Sub Timer ( callback As TimerCallback, state As Object, dueTime As TimeSpan, period As TimeSpan )
		This._Initialize(callback,state,dueTime.Ticks As Int64,period.Ticks As Int64)
	End Sub
	Sub Timer ( callback As TimerCallback, state As Object, dueTime As DWord, period As DWord )
		This._Initialize(callback,state,dueTime As Int64,period As Int64)
	End Sub
	Sub Timer ( callback As TimerCallback )
		This._Initialize(callback,Nothing,Timeout.Infinite As Int64,Timeout.Infinite As Int64)
	End Sub

	'オーバーロードされます。
	Sub Dispose()
		timeKillEvent(This.id)
	End Sub

	'タイマの開始時刻とメソッドの呼び出しの間隔を変更
	Function Change ( dueTime As Long, period As Long ) As Boolean
		This._Change(dueTime As Int64,period As Int64)
	End Function
	Function Change ( dueTime As Int64, period As Int64 ) As Boolean
		This._Change(dueTime As Int64,period As Int64)
	End Function
	Function Change ( dueTime As TimeSpan, period As TimeSpan ) As Boolean
		This._Change(dueTime.Ticks As Int64,period.Ticks As Int64)
	End Function
	Function Change ( dueTime As DWord, period As DWord ) As Boolean
		This._Change(dueTime As Int64,period As Int64)
	End Function

Protected
	callback As TimerCallback
	state As Object
	dueTime As Int64
	period As Int64
	id As MMRESULT
	tc As TIMECAPS

End Class


Namespace Detail
	Class Timer_Impl
		Inherits System.Threading.Timer
	Public
		Sub Callback()
			If Not IsNothing(callback) Then
				callback(This.state)
			End If

			'一回だけ実行
			If (period As Long) = -1 Then
				'ここで終了
				If id Then
					timeKillEvent(This.id)
					This.id = 0
					Exit Sub
				End If

			'周期的に実行
			Else			
				'ディレイ後に開始された
				If dueTime As Long Then
					timeKillEvent(This.id)
					This.id = timeSetEvent(This.period As DWord,tc.wPeriodMin,AddressOf(Detail.TimerProc_Impl),ObjPtr(This) As ULONG_PTR,TIME_PERIODIC or TIME_CALLBACK_FUNCTION)
					This.dueTime =0
				End If
			End If
		End Sub
	End Class
	Sub TimerProc_Impl(uID As DWord, uMsg As DWord, dwUser As DWORD_PTR, dw1 As DWORD_PTR, dw2 As DWORD_PTR)
		Dim obj As Timer_Impl
		obj = dwUser As Timer_Impl
		obj.Callback()
	End Sub
End Namespace

End Namespace
End Namespace