GanttControl.TimelineSplitterPositionChanging Event

Occurs before the timeline height is changed by a user and allows you to cancel the action.

Assembly : DevExpress.XtraGantt.v25.2.dll

NuGet Package : DevExpress.Win.Gantt

Declaration

C#
VB.NET

csharp

[DXCategory("Behavior")]
public event SplitterPositionChangingEventHandler TimelineSplitterPositionChanging

<DXCategory("Behavior")>
Public Event TimelineSplitterPositionChanging As SplitterPositionChangingEventHandler

Event Data

The TimelineSplitterPositionChanging event's data class is SplitterPositionChangingEventArgs. The following properties provide information specific to this event:

Property	Description
Cancel	Gets or sets a value indicating whether the event should be canceled. Inherited from CancelEventArgs.
NewValue	Gets the position that is about to be set.
OldValue	Gets the current position.

Remarks

Users can change the height of the timeline if the AllowResize option is enabled.

Use the e.OldValue and e.NewValue event parameters to obtain the height of the timeline before and after the resize. Set the e.Cancel parameter to true to cancel the action.

Note

The Gantt control does not raise the TimelineSplitterPositionChanging and TimelineSplitterPositionChanged events when changing the value of the TimelineHeight property.

Example

The following example demonstrates how to allow a user to resize the timeline within the specified range:

C#
VB.NET

csharp

using System;
using DevExpress.XtraGantt;
using DevExpress.XtraGantt.TimeLine;

// Unlocks the timeline.
ganttControl1.OptionsTimeline.AllowResize = true;
ganttControl1.TimelineSplitterPositionChanging += GanttControl1_TimelineSplitterPositionChanging;

private void GanttControl1_TimelineSplitterPositionChanging(object sender, SplitterPositionChangingEventArgs e) {
    e.Cancel = (int)e.NewValue <= 150 || (int)e.NewValue >= 300;
}

Imports System
Imports DevExpress.XtraGantt
Imports DevExpress.XtraGantt.TimeLine

' Unlocks the timeline.
Private Sub GanttControl1_TimelineSplitterPositionChanging(ByVal sender As Object, ByVal e As SplitterPositionChangingEventArgs)
    e.Cancel = CInt(Math.Truncate(e.NewValue)) <= 150 OrElse CInt(Math.Truncate(e.NewValue)) >= 300
End Sub

Read the following topic for detailed information and examples: Timeline.