什麼是最好的方式來判斷鼠標是否在表格之上？

Question

我在整個表格中計算出how to capture mouse clicks，但這種方法對於MouseEnter和MouseLeave的轉換效果不好。我的表單佈局由許多​​和TableLayoutPanels組成，所以沒有可以監控事件的全部控件，顯然按鈕的MouseLeave事件並不意味着光標離開了整個表單。有沒有人想出瞭解決這個問題的好方法？

Answer 1

正如有人指出here有可能使用調用SetWindowsHookEx（）或只是掛鉤MouseMove事件到表單中的所有控件。後者對我很好。唯一的缺點是，如果您在運行時添加/刪除控件，則可能需要另一個解決方案。

using System; 
using System.Drawing; 
using System.Windows.Forms; 

namespace WindowsForms_MouseEvents 
{ 
    public partial class Form1 : Form 
    { 
     public Form1() 
     { 
      InitializeComponent(); 

      MouseMove += OnMouseMove; 
      MouseLeave += OnMouseLeave; 

      HookMouseMove(this.Controls); 
     } 

     private void HookMouseMove(Control.ControlCollection ctls) 
     { 
      foreach (Control ctl in ctls) 
      { 
       ctl.MouseMove += OnMouseMove; 
       HookMouseMove(ctl.Controls); 
      } 
     } 

     private void OnMouseMove(object sender, MouseEventArgs e) 
     { 
      BackColor = Color.Plum; 

      Control ctl = sender as Control; 
      if (ctl != null) 
      { 
       // Map mouse coordinate to form 
       Point loc = this.PointToClient(ctl.PointToScreen(e.Location)); 
       Console.WriteLine("Mouse at {0},{1}", loc.X, loc.Y); 
      } 
     } 

     private void OnMouseLeave(object sender, EventArgs e) 
     { 
      BackColor = Color.Gray; 
     } 

    } 
} 

Answer 2

一個開始的地方是檢查ClientRectangle是否包含當前的鼠標位置。因此，舉例來說，你的MouseMove處理程序，你可以有：

if (ClientRectangle.Contains(e.Location)) 
{ 
    bool mouseIsOverThisControl = true; 
} 

Answer 3

添加一個計時器到形式合理區間（也許50毫秒）。使用此代碼在Tick事件處理程序，以查看是否鼠標在形式：

// Check if mouse is currently over the form 
    bool temp_mof = ClientRectangle.Contains(
     Form.MousePosition.X - Location.X, 
     Form.MousePosition.Y - Location.Y); 

編輯：這裏是檢測鼠標在形式和該按鈕被點擊了更完整的解決方案。 timer1Tick()是窗體上Timer的Tick事件處理程序。沒有必要爲表單上的其他控件添加額外的事件處理程序。這將使你的形式「一個巨大的按鈕」 :)

bool m_mouse_over_form = false; 
// Assume the left button is down at onset 
bool m_left_button_down = true; 

void timer1Tick (object sender, EventArgs e) 
{ 
    // Check if mouse is currently over the form 
    bool temp_mof = ClientRectangle.Contains(
     Form.MousePosition.X - Location.X, 
     Form.MousePosition.Y - Location.Y); 

    // were we already over the form before this tick? 
    if (temp_mof && m_mouse_over_form) 
    { 
     // we need to detect the mouse down and up to avoid 
     // repeated calls if the mouse button is held down for more 
     // than our Tick interval 

     // was the mouse button up prior to now? 
     if (!m_left_button_down) 
     { 
      // is the button down now? 
      m_left_button_down = (MouseButtons == MouseButtons.Left); 

      if (m_left_button_down) 
      { 
       // the button was down and has now been released 
       LeftButtonClickHandler(); 
      } 
      else 
      { 
       // do nothing, the button has not been release yet 
      } 
     } 
     else 
     { 
      // update the button state 
      m_left_button_down = (MouseButtons == MouseButtons.Left); 
     } 
    } 
    else if (temp_mof) 
    { 
     // the mouse just entered the form 

     m_mouse_over_form = true; 

     // set the initial state of the left button 
     m_left_button_down = MouseButtons == MouseButtons.Left); 
    } 
    else 
    { 
     // the mouse is not currently over the form 
     m_mouse_over_form = false; 
     m_left_button_down = true; 
    } 
} 

Answer 4

我發現了幾個接近我想要的答案，但我完成了一些不同的事情。我想檢測，如果鼠標左鍵的形式區（包括標題欄），這爲我工作：

在窗體構造函數中，我添加了一個計時器：

time.Interval = 250; 
time.Tick += time_Tick; 
time.Start(); 

然後在蜱方法，我執行以下操作：

void time_Tick(object sender, EventArgs e) 
{ 
    switch (RectangleToScreen(Bounds).Contains(PointToScreen(Cursor.Position))) { 
     case true: 
      if (Opacity != .9999D) 
       Opacity = .9999D; 
      break; 
     case false: 
      if (Opacity != .5D) 
       Opacity = .5D; 
      break; 
    } 
} 

Answer 5

通過窗體和窗體控件執行MouseEnter和MouseLeave事件;使用布爾值來確定鼠標是進入還是離開。

一個例子是

private static bool mouseEnteredForm 

    private void Form1_MouseMove(object sender, MouseEventArgs e) 
    { 
     mouseEnteredForm = true; 
     Form.MouseLeave += Form1_MouseLeave; 
     CheckMouseLocation(); 
    } 

    private void Form1_MouseLeave(object sender, MouseEventArgs e) 
    { 
     mouseEnteredForm = false 
     CheckMouseLocation(); 
    } 

    private static void CheckMouseLocation() 
    { 
     if(!mouseOverForm) 
     { 
      MessageBox.Show("Mouse Not Over Form!); 
     } 
     else if(mouseOverForm) //else if is optional. You could also use else in this case. I used else if for the sake of the example. 
     { 
      MessageBox.Show("Mouse Is Over Form"); 
     } 
    } 

這可能會很麻煩，如果你有過的形式