WPF Image ZoomIn ZoomOut via MouseWheel

//xaml
<Window x:Class="WpfApp104.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp104"
        mc:Ignorable="d" WindowState="Maximized"
        Title="{Binding ScaleValueStr}" Height="450" Width="800">
    <Grid> 
        <Canvas  x:Name="imgContainer">
            <Canvas.LayoutTransform>
                <ScaleTransform ScaleX="{Binding ScaleValue,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
                                ScaleY="{Binding ScaleValue,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"/>
            </Canvas.LayoutTransform>
            <Image Source="{Binding ImgSource,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
        MouseRightButtonDown="imgContainer_MouseRightButtonDown" Stretch="Uniform"
        MouseLeftButtonDown="Image_MouseLeftButtonDown"
        MouseWheel="imgContainer_MouseWheel"  /> 
        </Canvas>
        <TextBlock Text="{Binding ScaleValueStr,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Right" VerticalAlignment="Bottom" FontSize="30" />
    </Grid>
</Window>


//cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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.Navigation;
using System.Windows.Shapes;

namespace WpfApp104
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window, INotifyPropertyChanged
    { 
        public event PropertyChangedEventHandler PropertyChanged;
        private void OnPropertyChanged(string propName)
        {
            var handler = PropertyChanged;
            if (handler != null)
            {
                handler?.Invoke(this, new PropertyChangedEventArgs(propName));
            }
        }

        private double scaleValue = 1.0;
        public double ScaleValue
        {
            get
            {
                return scaleValue;
            }
            set
            {
                if (scaleValue != value)
                {
                    scaleValue = value;
                    OnPropertyChanged(nameof(ScaleValue));
                    ScaleValueStr = Math.Round(ScaleValue, 2).ToString("0.00"); 
                }
            }
        }

        private string scaleValueStr = "1.00";
        public string ScaleValueStr
        {
            get
            {
                return scaleValueStr;
            }
            set
            {
                if(value!= scaleValueStr) 
                {
                    scaleValueStr = value;
                    OnPropertyChanged(nameof(ScaleValueStr));
                }
            }
        }

        private string imgSource = string.Empty;
        public string ImgSource
        {
            get
            {
                return imgSource;
            }
            set
            {
                if(value!= imgSource) 
                {
                    imgSource = value;
                    OnPropertyChanged(nameof(ImgSource));
                }
            }
        }

        private static List<string> ImgsList = new List<string>();
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext= this;
            InitImgsList();
            ImgSource = ImgsList[0];
        }

        private void InitImgsList()
        {
            string fullDir = System.IO.Path.GetFullPath(@"..\..\Images");
            ImgsList.AddRange(Directory.GetFiles(fullDir));
        }

        private void imgContainer_MouseWheel(object sender, MouseWheelEventArgs e)
        {
            if(e.Delta>0)
            {
                ScaleValue *= 1.2;
            }
            else
            {
                ScaleValue /= 1.2;
            } 
        }

        private int currentIndex = 0;
        private void imgContainer_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
        { 
            if (currentIndex<0 || currentIndex+1>=ImgsList.Count)
            {
                currentIndex = 0; 
            }
            ImgSource = ImgsList[++currentIndex]; 
        }

        private void Image_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        { 
            if (currentIndex-1<0)
            {
                currentIndex=ImgsList.Count-1;
            }
            ImgSource = ImgsList[--currentIndex]; 
        }
    }
}