TransitionManager.Transitions Property

Provides access to the collection of control state transitions.

Namespace: DevExpress.Utils.Animation

Assembly: DevExpress.Utils.v20.1.dll


public TransitionCollection Transitions { get; }
Public ReadOnly Property Transitions As TransitionCollection

Property Value

Type Description

The collection of control state transitions.


The Transitions collection stores DevExpress.Utils.Animation.Transition objects which specify state animation parameters. The following image shows Transitions collection editor available at design time. The Transitions collection contains one Transition object which specifies animation parameters for a form:


Each Transition object associates a specific control (the Transition.Control property) with animation parameters. The animation effect is specified by the Transition.TransitionType property. To specify the animation effect in code, create and customize any of the following class objects and assign it to the Transition.TransitionType property.

  • DevExpress.Utils.Animation.PushTransition
  • DevExpress.Utils.Animation.FadeTransition
  • DevExpress.Utils.Animation.DissolveTransition
  • DevExpress.Utils.Animation.ShapeTransition
  • DevExpress.Utils.Animation.ClockTransition
  • DevExpress.Utils.Animation.SlideFadeTransition
  • DevExpress.Utils.Animation.CoverTransition
  • DevExpress.Utils.Animation.CombTransition

Animated transitions support easing functions, which accelerate and/or decelerate animation progress. By default, the ExponentialEase function is used. To use another easing function, handle the TransitionManager.CustomTransition event and set the EasingFunction event parameter. See TransitionManager.CustomTransition to learn more.

Demo: Transition Manager module in the ApplicationUI MainDemo


This example contains an XtraTabControl with two tabs. The TransitionManager component is used to animate switching between these tabs, using a certain animation effect (specified by the Transition Type combobox). Animated tab switching is initiated in the XtraTabControl.SelectedPageChanging event handler and is finished in the XtraTabControl.SelectedPageChanged event handler.Before the transition starts, it is created in the SelectedIndexChanged event of the combobox control. By default, the entire area occupied by the control is animated by the TransitionManager. In the example, the CustomTransition event is handled to exclude the tab region from animation.

The following image shows the state transition in progress:


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using DevExpress.Utils.Animation;
using DevExpress.XtraEditors;
using DevExpress.XtraEditors.Controls;

namespace TransitionManagerSample {
    public partial class Form1 : Form {
        public Form1() {

        Control animatedControl;

        private void xtraTabControl1_SelectedPageChanging(object sender, DevExpress.XtraTab.TabPageChangingEventArgs e) {
            // Start the state transition when a page is about to be switched.
            if (animatedControl == null) return;

        private void xtraTabControl1_SelectedPageChanged(object sender, DevExpress.XtraTab.TabPageChangedEventArgs e) {
            // Finish the transition after a page has been selected.

        private void Form1_Load(object sender, EventArgs e) {
            animatedControl = xtraTabControl1;

            // Populate the ImageComboBox with available transition types.
            imageComboBoxEdit1.SelectedIndexChanged += imageComboBoxEdit1_SelectedIndexChanged;
            imageComboBoxEdit1.SelectedIndex = 0;

        BaseTransition CreateTransitionInstance(Transitions transitionType) {
            switch (transitionType) {
                case Transitions.Dissolve: return new DissolveTransition();
                case Transitions.Fade: return new FadeTransition();
                case Transitions.Shape: return new ShapeTransition();
                case Transitions.Clock: return new ClockTransition();
                case Transitions.SlideFade: return new SlideFadeTransition();
                case Transitions.Cover: return new CoverTransition();
                case Transitions.Comb: return new CombTransition();
                default: return new PushTransition();

        void imageComboBoxEdit1_SelectedIndexChanged(object sender, EventArgs e) {
            ImageComboBoxEdit imComboBox = sender as ImageComboBoxEdit;

            if (transitionManager1.Transitions[animatedControl] == null) {
                // Add a transition, associated with the xtraTabControl1, to the TransitionManager.
                Transition transition1 = new Transition();
                transition1.Control = animatedControl;
            // Specify the transition type.
            DevExpress.Utils.Animation.Transitions trType = (DevExpress.Utils.Animation.Transitions)imComboBox.EditValue;
            transitionManager1.Transitions[animatedControl].TransitionType = CreateTransitionInstance(trType);

        // A custom easing function.
        DevExpress.Data.Utils.IEasingFunction myEasingFunc = new DevExpress.Data.Utils.BackEase();

        private void transitionManager1_CustomTransition(DevExpress.Utils.Animation.ITransition transition, DevExpress.Utils.Animation.CustomTransitionEventArgs e) {
            // Set a clip region for the state transition.
            e.Regions = new Rectangle[] { xtraTabPage1.Bounds };
            // Specify a custom easing function.
            e.EasingFunction = myEasingFunc;

See Also