WindowCustomize.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;

namespace DotNetPad
{
    public partial class MainWindow : Window
    {
        private void TopBorder_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            // This is all it takes to make the top of the window draggable
            DragMove();
        }

        // Display the system menu when you right-click the app icon
        private void AppIcon_MouseRightButtonUp(object sender, MouseButtonEventArgs e)
        {
            var offset = Application.Current.MainWindow.BorderThickness;
            SystemCommands.ShowSystemMenu(this, new Point((Left + offset.Left) + 24, (Top + offset.Top) + 24));
        }

        private void MinimizeButton_Click(object sender, RoutedEventArgs e)
        {
            this.WindowState = WindowState.Minimized;
        }

        private void MaximizeButton_Click(object sender, RoutedEventArgs e)
        {
            if (this.WindowState == WindowState.Maximized)
            {
                this.WindowState = WindowState.Normal;
            }
            else
            {
                // Make sure the maximized window doesn't cover the taskbar first
                this.MaxHeight = SystemParameters.MaximizedPrimaryScreenHeight;
                this.WindowState = WindowState.Maximized;
            }
        }

        private void CloseButton_Click(object sender, RoutedEventArgs e)
        {
            this.Close();
        }

        private void Window_StateChanged(object sender, EventArgs e)
        {
            switch (WindowState)
            {
                case WindowState.Normal:
                    MaximizeButton.Content = "\xE922";
                    break;
                case WindowState.Maximized:
                    MaximizeButton.Content = "\xE923";
                    break;
                default:
                    break;
            }
        }

        private void CloseButton_MouseEnter(object sender, MouseEventArgs e)
        {
            CloseButton.Background = Brushes.Red;
        }

        private void CloseButton_MouseLeave(object sender, MouseEventArgs e)
        {
            CloseButton.Background = Brushes.Transparent;
        }
    }
}