C#實作類別似QQ的表單停靠

直接上代碼：

 1         [DllImport("User32.dll")]
 2         public static extern bool PtInRect(ref Rectangle Rects, Point lpPoint);
 3 
 4         private void timerShowHide_Tick(object sender, EventArgs e)
 5         {
 6             if (this.WindowState == FormWindowState.Normal)
 7             {
 8                 System.Drawing.Point cursorPoint = new Point(Cursor.Position.X, Cursor.Position.Y);//擷取滑鼠在螢幕的座標點
 9                 Rectangle Rects = new Rectangle(this.Left, this.Top, this.Left + this.Width, this.Top + this.Height);//儲存當前表單在螢幕的所在地區
10                 bool prInRect = PtInRect(ref Rects, cursorPoint);
11                 if (prInRect)
12                 {//當滑鼠在當前表單內
13                     if (this.Top < 0)//表單的Top屬性小於0
14                         this.Top = 0;
15                     else if (this.Left < 0)//表單的Left屬性小於0
16                         this.Left = 0;
17                     else if (this.Right > Screen.PrimaryScreen.WorkingArea.Width)//表單的Right屬性大於螢幕寬度
18                         this.Left = Screen.PrimaryScreen.WorkingArea.Width - this.Width;
19                 }
20                 else
21                 {
22                     if (this.Top < 5)               //當表單的上邊框與螢幕的頂端的距離小於5時
23                         this.Top = 5 - this.Height; //將表單隱藏到螢幕的頂端
24                     else if (this.Left < 5)         //當表單的左邊框與螢幕的左端的距離小於5時
25                         this.Left = 5 - this.Width; //將表單隱藏到螢幕的左端
26                     else if (this.Right > Screen.PrimaryScreen.WorkingArea.Width - 5)//當表單的右邊框與螢幕的右端的距離小於5時
27                         this.Left = Screen.PrimaryScreen.WorkingArea.Width - 5;//將表單隱藏到螢幕的右端
28                 }
29             }
30         }