ScreenToGif/Controls/SpectrumSlider.cs

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using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Shapes;
using ScreenToGif.Util;

namespace ScreenToGif.Controls
{
    //Bug: If the user drags quickly the Thumb and release afterwards, the OnAfterSelection event is not triggered.

    #region SpectrumSlider

    /// <summary>
    /// Spectrum Slider.
    /// </summary>
    public class SpectrumSlider : Slider
    {
        #region Private Fields

        private ColorThumb _colorThumb;
        private Rectangle _spectrumRectangle;
        private LinearGradientBrush _pickerBrush;

        public delegate void AfterSelectingEventHandler();

        public event AfterSelectingEventHandler AfterSelecting;

        #endregion

        static SpectrumSlider()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(SpectrumSlider), new FrameworkPropertyMetadata(typeof(SpectrumSlider)));
        }

        #region Public Properties

        /// <summary>
        /// Current selected Color.
        /// </summary>
        public Color SelectedColor
        {
            get { return (Color)GetValue(SelectedColorProperty); }
            set { SetValue(SelectedColorProperty, value); }
        }

        #endregion

        #region Dependency Property Fields

        public static readonly DependencyProperty SelectedColorProperty = DependencyProperty.Register
            ("SelectedColor", typeof(Color), typeof(SpectrumSlider), new PropertyMetadata(Colors.Transparent));

        #endregion

        #region Public Methods