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Blur Effect on Control

RumataEstorish
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3.88/5 (8 votes)

Apr 3, 2014

CPOL
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40631

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2081

Simple code for applying and disabling blur effect on any UIElement

Introduction

This is a very simple class to apply and remove blur effect on UIElement in WPF.

Using the Code

You have only two extension methods: BlurApply and BlurDisable. The first one is called before applying effect - for example before showing dialog. The second one is usually called in finally block to guarantee returning to normal view even if exception occurred. 

 try
 {
     this.BlurApply(BlurRadius, new TimeSpan(0, 0, 1), TimeSpan.Zero);
        MessageBox.Show("Test");
 }
 finally
 {
        this.BlurDisable(new TimeSpan(0, 0, 5), TimeSpan.Zero);
 }

Also, you can apply this to any UIElement, like this TextBlock:

 try
            {
                txt.BlurApply(BlurRadius, new TimeSpan(0, 0, 1), TimeSpan.Zero);
                MessageBox.Show("Test");
            }
            finally
            {
                txt.BlurDisable(new TimeSpan(0, 0, 5), TimeSpan.Zero);
            }

The source code is as follows: 

    public static class BlurElementExtension
    {
        /// <summary>
        /// Turning blur on
        /// </summary>
        /// <param name="element">bluring element</param>
        /// <param name="blurRadius">blur radius</param>
        /// <param name="duration">blur animation duration</param>
        /// <param name="beginTime">blur animation delay</param>
        public static void BlurApply(this UIElement element, 
            double blurRadius, TimeSpan duration, TimeSpan beginTime)
        {
                BlurEffect blur = new BlurEffect() { Radius = 0 };
                DoubleAnimation blurEnable = new DoubleAnimation(0, blurRadius, duration) 
                    { BeginTime = beginTime };
                element.Effect = blur;
                blur.BeginAnimation(BlurEffect.RadiusProperty, blurEnable);
        }
        /// <summary>
        /// Turning blur off
        /// </summary>
        /// <param name="element">bluring element</param>
        /// <param name="duration">blur animation duration</param>
        /// <param name="beginTime">blur animation delay</param>
        public static void BlurDisable(this UIElement element, TimeSpan duration, TimeSpan beginTime)
        {
            BlurEffect blur = element.Effect as BlurEffect;
            if (blur == null || blur.Radius == 0)
            {
                return;
            }
            DoubleAnimation blurDisable = new DoubleAnimation(blur.Radius, 0, duration) { BeginTime = beginTime };
            blur.BeginAnimation(BlurEffect.RadiusProperty, blurDisable);
        }
    }

Thank you!