2

C#.Net 中有没有办法检查鼠标指针是否可见?(例如在触摸设备上)

还是符号类型呢?(指针,加载圈,隐藏)

4

5 回答 5

5

看看使用Cursor.Current

表示鼠标光标的 Cursor。如果鼠标光标不可见,则默认值为 null。

所以像

Cursor current = Cursor.Current;

if(current == null)
    //the cursor is not visible
else
    //the cursor is visible
于 2013-04-07T16:59:12.850 回答
2

根据 MSDN :

属性值 类型:System.Windows.Forms.Cursor 表示鼠标光标的 Cursor。如果鼠标光标不可见,则默认值为 null。

所以这段代码应该可以完成这项工作:

If (Cursor.Current == null)
{
    // cursor is invisible
}
else
{
    // cursor is visible
}
于 2013-04-07T16:59:26.167 回答
2

我凭经验发现Cursor.Current == null并不表示光标隐藏状态(Windows 10 Pro、.Net 4.7、Windows.Forms、2020.04.07)。

为了澄清问题,我想检查(未设置)光标隐藏状态,因为这似乎是可靠检测鼠标事件是否由鼠标/触摸板(光标可见)或手指触摸(光标不可见的)。

深入 Win32 调用可以成功检查此状态:

#region Cursor info

public static class CursorExtensions {

  [StructLayout(LayoutKind.Sequential)]
  struct PointStruct {
    public Int32 x;
    public Int32 y;
  }

  [StructLayout(LayoutKind.Sequential)]
  struct CursorInfoStruct {
    /// <summary> The structure size in bytes that must be set via calling Marshal.SizeOf(typeof(CursorInfoStruct)).</summary>
    public Int32 cbSize;
    /// <summary> The cursor state: 0 == hidden, 1 == showing, 2 == suppressed (is supposed to be when finger touch is used, but in practice finger touch results in 0, not 2)</summary>
    public Int32 flags;
    /// <summary> A handle to the cursor. </summary>
    public IntPtr hCursor; 
    /// <summary> The cursor screen coordinates.</summary>
    public PointStruct pt; 
  }

  /// <summary> Must initialize cbSize</summary>
  [DllImport("user32.dll")]
  static extern bool GetCursorInfo(ref CursorInfoStruct pci);

  public static bool IsVisible(this Cursor cursor) {
    CursorInfoStruct pci = new CursorInfoStruct();
    pci.cbSize = Marshal.SizeOf(typeof(CursorInfoStruct));
    GetCursorInfo(ref pci);
    // const Int32 hidden = 0x00;
    const Int32 showing = 0x01;
    // const Int32 suppressed = 0x02;
    bool isVisible = ((pci.flags & showing) != 0);
    return isVisible;
  }

}

#endregion Cursor info

客户端代码现在非常方便:

bool isTouch = !Cursor.Current.IsVisible();
于 2020-04-07T15:16:11.427 回答
1

您可以使用System.Windows.Forms.Cursor类来获取信息;

使用Cursor.Current属性!

if (Cursor.Current == null)
{
    //
}
于 2013-04-07T16:59:44.260 回答
0

如果您谈论的是 WPF 变体,那么框架元素的 Cursor 属性应该是None如果它不可见。

于 2013-04-07T17:04:32.503 回答