using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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;
using System.Windows.Threading;
using System.Runtime.InteropServices;

namespace WpfAutoHide
{
    /// <summary>
    /// Window1.xaml 的交互逻辑
    /// </summary>
    public partial class Window1 : Window
    {
        private const int BORDER = 3;
        private const int AUTOHIDETIME = 50;

        private Location _Location = Location.None;
        private bool _IsHidded = false;
        private DispatcherTimer _AutoHideTimer = null;

        public Window1()
        {
            InitializeComponent();

            this._AutoHideTimer = new DispatcherTimer();
            this._AutoHideTimer.Interval = TimeSpan.FromMilliseconds(AUTOHIDETIME);
            this._AutoHideTimer.Tick += new EventHandler(AutoHideTimer_Tick);
        }

        void AutoHideTimer_Tick(object sender, EventArgs e)
        {
            POINT p;
            if (!GetCursorPos(out p))
            {
                return;
            }

            if (p.x >= this.Left && p.x <= (this.Left + this.ActualWidth)
                && p.y >= this.Top && p.y <= (this.Top + this.ActualHeight))
            {
                this.ShowWindow();
            }
            else
            {
                this.HideWindow();
            }
        }

        protected override void OnLocationChanged(EventArgs e)
        {
            if (!this._IsHidded)
            {
                if (this.Top <= 0 && this.Left <= 0)
                {
                    this._Location = Location.LeftTop;
                    this.HideWindow();
                }
                else if (this.Top <= 0 && this.Left >= SystemParameters.VirtualScreenWidth - this.ActualWidth)
                {
                    this._Location = Location.RightTop;
                    this.HideWindow();
                }
                else if (this.Top <= 0)
                {
                    this._Location = Location.Top;
                    this.HideWindow();
                }
                else
                {
                    this._Location = Location.None;
                }
            }
            base.OnLocationChanged(e);
        }

        enum Location
        {
            None,
            Top,
            LeftTop,
            RightTop
        }

        private void ShowWindow()
        {
            if (this._IsHidded)
            {
                switch (this._Location)
                {
                    case Location.Top:
                    case Location.LeftTop:
                    case Location.RightTop:
                        this.Top = 0;
                        this.Topmost = false;
                        this._IsHidded = false;
                        this.UpdateLayout();
                        break;
                    case Location.None:
                        break;
                }
            }
        }

        private void HideWindow()
        {
            if (!this._IsHidded)
            {
                switch (this._Location)
                {
                    case Location.Top:
                        this.Top = BORDER - this.ActualHeight;
                        this.Topmost = true;
                        this._IsHidded = true;
                        this._AutoHideTimer.Start();
                        break;
                    case Location.LeftTop:
                        this.Left = 0;
                        this.Top = BORDER - this.ActualHeight;
                        this.Topmost = true;
                        this._IsHidded = true;
                        this._AutoHideTimer.Start();
                        break;
                    case Location.RightTop:
                        this.Left = SystemParameters.VirtualScreenWidth - this.ActualWidth;
                        this.Top = BORDER - this.ActualHeight;
                        this.Topmost = true;
                        this._IsHidded = true;
                        this._AutoHideTimer.Start();
                        break;
                    case Location.None:
                        break;
                }
            }
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct POINT
        {
            public int x;
            public int y;
            public POINT(int x, int y)
            {
                this.x = x;
                this.y = y;
            }
        }

        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern bool GetCursorPos(out POINT pt);
    }
}

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