#region 窗口移动
private bool _isLeftButtonDown = false;

public const int HTCAPTION = 0x0002;

protected override void WndProc(ref System.Windows.Forms.Message m)
{
base.WndProc(ref m);

switch (m.Msg)
{
case WinApi.WM_LBUTTONDOWN:
case WinApi.WM_LBUTTONUP:

int lParam = m.LParam.ToInt32();
int x = lParam & 0xFFFF;
int y = (lParam >> 16);

switch (m.Msg)
{
case WinApi.WM_LBUTTONDOWN:
if (x < Width - 20 || y > 20)
{
this._isLeftButtonDown = true;
WinApi.ReleaseCapture();
WinApi.SendMessage(this.Handle, WinApi.WM_SYSCOMMAND, WinApi.SC_MOVE + HTCAPTION, 0);
}
break;
case WinApi.WM_LBUTTONUP:
if (this._isLeftButtonDown)
{
this._isLeftButtonDown = false;
if (x < Width - 20 || y > 20)
{
WinApi.ReleaseCapture();
SaveLocation();
}
}
break;
}
break;
}
}

/// <summary>
/// 保存窗口位置.
/// </summary>
private void SaveLocation()
{
if (this._isLeftButtonDown)
{
SavedLocation = this.Location;
}
}

/// <summary>
/// 引发 <see cref="E:System.Windows.Forms.Control.LocationChanged"/> 事件。
/// </summary>
/// <param name="e">包含事件数据的 <see cref="T:System.EventArgs"/>。</param>
protected override void OnLocationChanged(EventArgs e)
{
const int DX = 25;
const int DY = 25;

Point location = this.Location;
Rectangle rect = Screen.PrimaryScreen.WorkingArea;
if (location.X + this.Width < DX)
{
location.X = DX - this.Width;
}
else if (location.X + DX > rect.Width)
{
location.X = rect.Width - DX;
}
if (location.Y + this.Height < DY)
{
location.Y = DY - this.Height;
}
else if (location.Y + DY > rect.Height)
{
location.Y = rect.Height - DY;
}

if (location != this.Location)
{
this.Location = location;
}

SaveLocation();
}

private const string SAVED_LOCATION_REGSTER_KEY = @"Software\AlarmClient\SavedLocation";

/// <summary>
/// 保存路径
/// </summary>
private Point SavedLocation
{
get
{
int x, y;
try
{
RegistryKey key = Registry.CurrentUser.OpenSubKey(SAVED_LOCATION_REGSTER_KEY);
if (key != null)
{
x = (int)key.GetValue("X", 0);
y = (int)key.GetValue("Y", 0);

return new Point(x, y);
}
}
catch (Exception ex)
{
TestLog.DoLog(ex);
}

Rectangle rect = Screen.PrimaryScreen.WorkingArea;
x = rect.Width - this.Width;
y = rect.Height - this.Height;
return new Point(x, y);
}
set
{
try
{
RegistryKey key = Registry.CurrentUser.CreateSubKey(SAVED_LOCATION_REGSTER_KEY);
key.SetValue("X", value.X);
key.SetValue("Y", value.Y);
}
catch (Exception ex)
{
TestLog.DoLog(ex);
}
}
}

/// <summary>
/// 引发 <see cref="E:System.Windows.Forms.Form.Load"/> 事件。
/// </summary>
/// <param name="e">包含事件数据的 <see cref="T:System.EventArgs"/>。</param>
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
//if (this._activeWindow != IntPtr.Zero)
//{
// WinApi.SetActiveWindow(this._activeWindow);
//}
//this.Controls.EachChildFirst((Control c) =>
//{
// LabelX label = c as LabelX;
// if (label == null) return false;

// label.MouseDown += new MouseEventHandler(label_MouseDown);
// label.MouseMove += new MouseEventHandler(label_MouseMove);

// return true;
//});

// 让窗口上的每一个 LabelX 都把鼠标按下和移动的消息发送给本窗口
MouseEventHandler down = new MouseEventHandler(label_MouseDown);
MouseEventHandler move = new MouseEventHandler(label_MouseMove);

// 遍历窗口中的 LabelX
this.Controls.EachChildFirst((Control c) =>
{
LabelX label = c as LabelX;
if (label == null) return false;

label.MouseDown += down;
label.MouseMove += move;

return true;
});

// 加载初始位置
this.Location = this.SavedLocation;
// 设置窗口为一个圆角的矩形
//this.Region = CreateRegion();
}

/// <summary>
/// 给窗口添加圆角区域
/// </summary>
/// <returns></returns>
private Region CreateRegion()
{
const int RX = 15;
const int RY = 15;

//Region region = this.Region;
System.Drawing.Drawing2D.GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath();
path.FillMode = System.Drawing.Drawing2D.FillMode.Winding;
path.AddRectangle(new Rectangle(1, RY, this.Width - 2, this.Height - (RY + RY)));
path.AddRectangle(new Rectangle(RX, 1, this.Width - (RX + RX + 2), this.Height - 2));
path.AddEllipse(1, 0, RX + RX, RY + RY);
path.AddEllipse(1, this.Height - (RY + RY + 2), RX + RX, RY + RY);
path.AddEllipse(this.Width - (RX + RX + 2), 0, RX + RX, RY + RY);
path.AddEllipse(this.Width - (RX + RX + 2), this.Height - (RY + RY + 2), RX + RX, RY + RY);

return new Region(path);
}

/// <summary>
/// 鼠标在 LabelX 上移动时，将消息发送给窗口
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void label_MouseMove(object sender, MouseEventArgs e)
{
WinApi.PostMessage(this.Handle, WinApi.WM_MOUSEMOVE, 1, e.X | (e.Y << 16));
}

/// <summary>
/// 鼠标在 LabelX 上按下时，将消息发送给窗口
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void label_MouseDown(object sender, MouseEventArgs e)
{
WinApi.PostMessage(this.Handle, WinApi.WM_LBUTTONDOWN, 1, e.X | (e.Y << 16));
}
#endregion