如何在mousemove事件中检查键盘按键状态

Question

我希望能够使用空格键修改鼠标按住时的行为。不知道更好，我想象它涉及两个（或三个）事件处理程序之间的某种协调 - mousemove,​​和keyup。但我想知道是否有办法在一个事件处理程序中完全处理它 - mousemove。

示例代码给什么，我希望能够做一个想法...

 private void pictureBox1_MouseMove(object sender, MouseEventArgs e) 
     { 
      if (e.Button == MouseButtons.Left) 
      { 
       if (Keyboard.KeyDown == Keys.Space) 
       { 
        /* Do modified behavour for left mouse being held down while 
        space is also held down */ 
       } 
       else 
       { 
        // Do normal behavour for left mouse being held down 
       } 

      } 
     } 

是这样的可能，否则我将不得不在空格键的状态保存到一个类变量使用keydown事件处理程序并用鼠标移动处理程序检查它？

Answer 1

您应该设置一个变量在你的KeyDown-事件，并检查它的MouseEvents：

bool buttonpressed = false; 
private void KeyDown_Event(object s, System.Windows.Forms.KeyEventArgs e) 
{ 
    if(e.KeyCode == KeyCode.Space) 
     buttonpressed = true; 
    else 
     buttonpressed = false; 
} 

private void pictureBox1_MouseMove(object sender, MouseEventArgs e) 
     { 
      if (e.Button == MouseButtons.Left) 
      { 
       if (buttonPressed) 
       { 
        /* Do modified behavour for left mouse being held down while 
        space is also held down */ 
       } 
       else 
       { 
        // Do normal behavour for left mouse being held down 
       } 

      } 
     } 

Answer 2

我不得不跟踪时Keys.Space是在Pressed状态的变量，然后用KeyUp触发它， KeyDown事件

private void pictureBox1_MouseMove(object sender, MouseEventArgs e) 
     // Check if Key.Space pressed 
     if(SpacePressed) { 
      // Do something 
     } 
} 

private void KeyPressed_Event(object sender, KeyEventArgs e) { 
     // Check if Key.Space pressed 
     if(e.Key == Key.Space) { 
      SpacePressed = true; 
     } 
} 

private void KeyRelease_Event(object sender, KeyEventArgs e) { 
     // Check if Key.Space pressed 
     if(e.Key == Key.Space) { 
      SpacePressed = false; 
     } 
} 

Answer 3

它可以使用Control.ModifierKeys & Control.MouseButtons来完成。但只适用于像shift，ctrl和alt之类的kays。

private void Form1_MouseMove(object sender, MouseEventArgs e) 
    { 

     if ((Control.ModifierKeys & Keys.Shift) != 0) 
     { 
      if ((Control.MouseButtons & MouseButtons.Left) != 0) 
      { // here you go 

      } 
     } 
    } 

Answer 4

您可以使用PInvoke在User32.dll中调用GetKeyState。