Improve the scrolling performanceWhen large number of controls are added to the Gradient Panel whose size is smaller than the added controls, and when you scroll for the invisible controls, then time delay may occur to paint the newly visible controls. This can be resolved by overriding the function OnScroll of the UserControl. The following code example demonstrates the same. C# //Overriding OnScroll method of the UserControl
protected override void OnScroll(ScrollEventArgs se)
{
if (se.ScrollOrientation == ScrollOrientation.VerticalScroll)
{
this.VerticalScroll.Value = se.NewValue;
}
else if (se.ScrollOrientation == ScrollOrientation.HorizontalScroll)
{
this.HorizontalScroll.Value = se.NewValue;
}
this.Invalidate();
base.OnScroll(se);
}
VB 'Overriding OnScroll method of the UserControl Protected Overrides Sub OnScroll(ByVal se As ScrollEventArgs) If se.ScrollOrientation = ScrollOrientation.VerticalScroll Then Me.VerticalScroll.Value = se.NewValue ElseIf se.ScrollOrientation = ScrollOrientation.HorizontalScroll Then Me.HorizontalScroll.Value = se.NewValue End If Me.Invalidate() MyBase.OnScroll(se) End Sub Samples: C#: http://www.syncfusion.com/downloads/support/directtrac/135929/ScrollersFrame_OnScroll-555157854.zip VB: http://www.syncfusion.com/downloads/support/directtrac/135701/ScrollersFrame_OnScroll_VB90170541.zip |
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