BeforeSpinEventHandler デリゲート

スピンボタンをクリックしたために日付が変わる前に発生するイベントを処理するためのデリゲート。

シンタックス

Visual Basic

'宣言
 
Public Delegate Sub BeforeSpinEventHandler( _
   ByVal sender As Object, _
   ByVal e As BeforeSpinEventArgs _
) 

C#

public delegate void BeforeSpinEventHandler( 
   object sender,
   BeforeSpinEventArgs e
)

パラメータ

sender

e

使用例

NOTE: This example requires that the control's SpinButtonsVisible property be set to true, like so:
Me.ultraCalendarCombo1.SpinButtonsVisible = True

Visual Basic

Private Sub ultraCalendarCombo1_BeforeSpin(ByVal sender As Object, ByVal e As Infragistics.Win.UltraWinSchedule.BeforeSpinEventArgs) Handles ultraCalendarCombo1.BeforeSpin

       '	Use the BeforeSpinEventArgs' CurrentValue property
       '	to determine the control's current value
       If (Not e.CurrentValue Is Nothing) Then
           Dim dateVal As DateTime = e.CurrentValue
           Dim info As String = String.Empty

           '	Use the AfterSpinEventArgs' SpinDirection property
           '	to determine whether the up or down spin button was clicked
           Dim spinUp As Boolean = True
           If (e.SpinDirection = ScrollButton.Down) Then
               spinUp = False
           End If

           '	Use the NewDate property to determine what the date
           '	will be if the spin operation is not canceled
           Dim newDate As DateTime = e.NewDate

           '	If the up spin button was clicked, and the new date would be
           '	outside the current year, cancel the spin operation by setting
           '	the Cancel property to true.
           If (spinUp And newDate.Year <> DateTime.Today.Year) Then
               e.Cancel = True
           End If
       End If

   End Sub

NOTE: This example requires that the control's SpinButtonsVisible property be set to true, like so:
this.ultraCalendarCombo1.SpinButtonsVisible = true;

C#

private void ultraCalendarCombo1_BeforeSpin(object sender, Infragistics.Win.UltraWinSchedule.BeforeSpinEventArgs e)
{

	//	Use the BeforeSpinEventArgs' CurrentValue property
	//	to determine the control's current value
	if ( e.CurrentValue is System.DateTime )
	{
		DateTime dateVal = (DateTime)(e.CurrentValue);
		string info = string.Empty;


		//	Use the AfterSpinEventArgs' SpinDirection property
		//	to determine whether the up or down spin button was clicked
		bool spinUp = true;
		if ( e.SpinDirection == ScrollButton.Down )
			spinUp = false;
		
		//	Use the NewDate property to determine what the date
		//	will be if the spin operation is not canceled
		DateTime newDate = e.NewDate;

		//	If the up spin button was clicked, and the new date would be
		//	outside the current year, cancel the spin operation by setting
		//	the Cancel property to true.
		if ( spinUp && newDate.Year != DateTime.Today.Year )
			e.Cancel = true;
	}		
 
}