ScreenToGif/Controls/RangeSlider.cs

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using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;

namespace ScreenToGif.Controls
{
    /// <summary>
    /// Range Slider control.
    /// </summary>
    public class RangeSlider : Control
    {
        #region Variables

        private Slider _lowerSlider;
        private Slider _upperSlider;
        private Border _progressBorder;

        #endregion

        #region Dependency

        public static readonly DependencyProperty MinimumProperty = DependencyProperty.Register("Minimum", typeof(double), typeof(RangeSlider), 
            new FrameworkPropertyMetadata(0d));

        public static readonly DependencyProperty LowerValueProperty = DependencyProperty.Register("LowerValue", typeof(double), typeof(RangeSlider), 
            new FrameworkPropertyMetadata(10d, LowerValue_PropertyChanged));

        public static readonly DependencyProperty UpperValueProperty = DependencyProperty.Register("UpperValue", typeof(double), typeof(RangeSlider), 
            new FrameworkPropertyMetadata(90d, UpperValue_PropertyChanged));

        public static readonly DependencyProperty MaximumProperty = DependencyProperty.Register("Maximum", typeof(double), typeof(RangeSlider), 
            new FrameworkPropertyMetadata(100d));

        public static readonly DependencyProperty DisableLowerValueProperty = DependencyProperty.Register("DisableLowerValue", typeof(bool), typeof(RangeSlider), 
            new FrameworkPropertyMetadata(false));

        public static readonly DependencyProperty TickPlacementProperty = DependencyProperty.Register("TickPlacement", typeof(TickPlacement), typeof(RangeSlider), 
            new FrameworkPropertyMetadata(TickPlacement.None));

        #endregion

        #region Properties

        /// <summary>
        /// Minimum value of the slider.
        /// </summary>
        public double Minimum
        {
            get { return (double)GetValue(MinimumProperty); }
            set { SetValue(MinimumProperty, value); }
        }

        /// <summary>
        /// Maximum value of the slider.
        /// </summary>
        public double Maximum
        {
            get { return (double)GetValue(MaximumProperty); }