annotations/Azaion.Annotator/Controls/UpdatableProgressBar.cs

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

namespace Azaion.Annotator.Controls
{
    public class UpdatableProgressBar : ProgressBar
    {
        public delegate void ValueChange(double oldValue, double newValue);

        public new event ValueChange? ValueChanged;

        public UpdatableProgressBar() : base()
        {
            MouseDown += OnMouseDown;
            MouseMove += OnMouseMove;
        }
        
        private double SetProgressBarValue(double mousePos)
        {
            Value = Minimum;
            var pbValue = mousePos / ActualWidth * Maximum;
            ValueChanged?.Invoke(Value, pbValue);
            return pbValue;
        }

        private void OnMouseDown(object sender, MouseButtonEventArgs e)
        {
            Value = SetProgressBarValue(e.GetPosition(this).X);
        }

        private void OnMouseMove(object sender, MouseEventArgs e)
        {
            if (e.LeftButton == MouseButtonState.Pressed)
                Value = SetProgressBarValue(e.GetPosition(this).X);
        }
    }
}