TypeOnAction.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Windows.Interactivity;
using System.Windows.Threading;
 
namespace TypeOnScreens
{
    //
    // If you want your Action to target elements other than its parent, extend your class
    // from TargetedTriggerAction instead of from TriggerAction
    //
    public class TypeOnAction : TriggerAction<TextBlock>
    {
        DispatcherTimer timer;
        int len = 1;
 
        public TypeOnAction()
        {
            // Insert code required on object creation below this point.
            timer = new DispatcherTimer();
        }
 
        protected override void Invoke(object o)
        {
            // Insert code that defines what the Action will do when triggered/invoked.
            if (AssociatedObject == null)
                return;
 
            AssociatedObject.Text = "";
            timer.Interval = TimeSpan.FromSeconds(IntervalInSeconds);
            timer.Tick += new EventHandler(timer_Tick);
            len = 1;
            timer.Start();
        }
 
        
        void timer_Tick(object sender, EventArgs e)
        {
            if (len > 0 && len <= TypeOnText.Length)
            {
                AssociatedObject.Text = TypeOnText.Substring(0, len);
                len++;
                timer.Start();
            }
            else
                timer.Stop();
        }
 
        public string TypeOnText
        {
            get { return (string)GetValue(TypeOnTextProperty); }
            set { SetValue(TypeOnTextProperty, value); }
        }
 
        // Using a DependencyProperty as the backing store for TypeOnText.  This enables animation, styling, binding, etc…
        public static readonly DependencyProperty TypeOnTextProperty =
            DependencyProperty.Register("TypeOnText", typeof(string), typeof(TypeOnAction), new PropertyMetadata(""));
 
 
 
        public double IntervalInSeconds
        {
            get { return (double)GetValue(IntervalInSecondsProperty); }
            set { SetValue(IntervalInSecondsProperty, value); }
        }
 
        // Using a DependencyProperty as the backing store for IntervalInSeconds.  This enables animation, styling, binding, etc…
        public static readonly DependencyProperty IntervalInSecondsProperty =
            DependencyProperty.Register("IntervalInSeconds", typeof(double), typeof(TypeOnAction), new PropertyMetadata(0.35));
 
 
 
    }
}