TreeViewControl.CustomScrollAnimation Event

Allows you to create a custom animation when TreeViewControl data is vertically scrolled (per-pixel).

Namespace: DevExpress.Xpf.Grid

Assembly: DevExpress.Xpf.Grid.v20.2.dll

NuGet Packages: DevExpress.WindowsDesktop.Wpf.Grid.Core, DevExpress.Wpf.Grid.Core

Declaration

C#

public event TreeViewCustomScrollAnimationEventHandler CustomScrollAnimation

VB.NET

Public Event CustomScrollAnimation As TreeViewCustomScrollAnimationEventHandler

Event Data

The CustomScrollAnimation event's data class is DevExpress.Xpf.Grid.TreeList.TreeViewCustomScrollAnimationEventArgs.

Remarks

To create a custom animation for per-pixel scrolling, set the AllowScrollAnimation property to true and the ScrollAnimationMode property to Custom.

Example

The following images demonstrate the difference between the default scroll animation and the scroll animation created in the code sample below.

XAML

<dxg:TreeViewControl ...
                     x:Name="treeview"
                     AllowScrollAnimation="True"
                     ScrollAnimationMode="Custom"
                     CustomScrollAnimation="treeview_CustomScrollAnimation"/>

C#

using System.Windows.Media.Animation;

void treeview_CustomScrollAnimation(object sender, DevExpress.Xpf.Grid.TreeList.TreeViewCustomScrollAnimationEventArgs e) {
    e.Storyboard = new Storyboard();
    DoubleAnimation animation = new DoubleAnimation();
    animation.From = e.OldOffset;
    animation.To = e.NewOffset;
    animation.Duration = new Duration(TimeSpan.FromMilliseconds(600));
    animation.EasingFunction = new ExponentialEase() { Exponent = 0 };
    e.Storyboard.Children.Add(animation);
}

VB.NET

Imports System.Windows.Media.Animation

Private Sub treeview_CustomScrollAnimation(ByVal sender As Object, ByVal e As DevExpress.Xpf.Grid.TreeList.TreeViewCustomScrollAnimationEventArgs)
    e.Storyboard = New Storyboard()
    Dim animation As DoubleAnimation = New DoubleAnimation()
    animation.From = e.OldOffset
    animation.[To] = e.NewOffset
    animation.Duration = New Duration(TimeSpan.FromMilliseconds(600))
    animation.EasingFunction = New ExponentialEase() With {
        .Exponent = 0
    }
    e.Storyboard.Children.Add(animation)
End Sub