BarrageTransporter/BarrageTransporter/BarrageCurtainWindow.xaml.cs

using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;

namespace BarrageTransporter
{
    /// <summary>
    /// BarrageCurtainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class BarrageCurtainWindow : Window
    {
        public double screenHeight = SystemParameters.PrimaryScreenHeight;
        public double screenWidth = SystemParameters.PrimaryScreenWidth;

        private BarrageManager barrageManager = null;

        public BarrageCurtainWindow()
        {
            InitializeComponent();
            Top = 0;
            Left = 0;
            Width = screenWidth;
            Height = screenHeight;
        }

        /// <summary>
        /// Window penetration
        /// </summary>
        protected override void OnSourceInitialized(EventArgs e)
        {
            base.OnSourceInitialized(e);
            var hwnd = new WindowInteropHelper(this).Handle;
            WindowsServices.SetWindowExTransparent(hwnd);
        }

        public void Shoot(string text)
        {
            if (barrageManager == null)
            {
                barrageManager = new BarrageManager(curtain);
            }
            barrageManager.Shoot(text);
        }

        public int BarrageCount
        {
            get
            {
                if (barrageManager == null)
                {
                    return 0;
                }
                else
                {
                    return barrageManager.BarrageCount;
                }
            }
        }
    }

    /// <summary>
    /// Window penetration
    /// </summary>
    public static class WindowsServices
    {
        const int WS_EX_TRANSPARENT = 0x00000020;
        const int GWL_EXSTYLE = (-20);

        [DllImport("user32.dll")]
        static extern int GetWindowLong(IntPtr hwnd, int index);

        [DllImport("user32.dll")]
        static extern int SetWindowLong(IntPtr hwnd, int index, int newStyle);

        public static void SetWindowExTransparent(IntPtr hwnd)
        {
            var extendedStyle = GetWindowLong(hwnd, GWL_EXSTYLE);
            SetWindowLong(hwnd, GWL_EXSTYLE, extendedStyle | WS_EX_TRANSPARENT);
        }
    }
}