ScrollEventHandler Delegate
Assembly: System.Windows.Forms (in system.windows.forms.dll)
'Declaration Public Delegate Sub ScrollEventHandler ( _ sender As Object, _ e As ScrollEventArgs _ ) 'Usage Dim instance As New ScrollEventHandler(AddressOf HandlerMethod)
/** @delegate */ public delegate void ScrollEventHandler ( Object sender, ScrollEventArgs e )
JScript supports the use of delegates, but not the declaration of new ones.
Parameters
- sender
The source of the event.
- e
A ScrollEventArgs that contains the event data.
When you create a ScrollEventArgs delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event handler delegates, see Events and Delegates.
Private Sub AddMyScrollEventHandlers() ' Create and initialize a VScrollBar. Dim vScrollBar1 As New VScrollBar() ' Add event handlers for the OnScroll and OnValueChanged events. AddHandler vScrollBar1.Scroll, AddressOf Me.vScrollBar1_Scroll AddHandler vScrollBar1.ValueChanged, AddressOf Me.vScrollBar1_ValueChanged End Sub ' Create the ValueChanged event handler. Private Sub vScrollBar1_ValueChanged(sender As Object, e As EventArgs) ' Display the new value in the label. label1.Text = "vScrollBar Value:(OnValueChanged Event) " & _ vScrollBar1.Value.ToString() End Sub ' Create the Scroll event handler. Private Sub vScrollBar1_Scroll(sender As Object, e As ScrollEventArgs) ' Display the new value in the label. label1.Text = "VScrollBar Value:(OnScroll Event) " & _ e.NewValue.ToString() End Sub Private Sub button1_Click(sender As Object, e As EventArgs) ' Add 40 to the Value property if it will not exceed the Maximum value. If vScrollBar1.Value + 40 < vScrollBar1.Maximum Then vScrollBar1.Value = vScrollBar1.Value + 40 End If End Sub
private void AddMyScrollEventHandlers()
{
// Create and initialize a VScrollBar.
VScrollBar vScrollBar1 = new VScrollBar();
// Add event handlers for the OnScroll and OnValueChanged events.
vScrollBar1.add_Scroll(
new ScrollEventHandler(this.vScrollBar1_Scroll));
vScrollBar1.add_ValueChanged(
new EventHandler(this.vScrollBar1_ValueChanged));
} //AddMyScrollEventHandlers
// Create the ValueChanged event handler.
private void vScrollBar1_ValueChanged(Object sender, EventArgs e)
{
// Display the new value in the label.
label1.set_Text("vScrollBar Value:(OnValueChanged Event) "
+ vScrollBar1.get_Value());
} //vScrollBar1_ValueChanged
// Create the Scroll event handler.
private void vScrollBar1_Scroll(Object sender, ScrollEventArgs e)
{
// Display the new value in the label.
label1.set_Text(
"VScrollBar Value:(OnScroll Event) " + e.get_NewValue());
} //vScrollBar1_Scroll
private void button1_Click(Object sender, EventArgs e)
{
// Add 40 to the Value property if it will not exceed the Maximum
// value.
if (vScrollBar1.get_Value() + 40 < vScrollBar1.get_Maximum()) {
vScrollBar1.set_Value(vScrollBar1.get_Value() + 40);
}
} //button1_Click
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.