如何在mousemove事件中檢查鍵盤按鍵狀態

Question

我希望能夠使用空格鍵修改鼠標按住時的行爲。不知道更好，我想象它涉及兩個（或三個）事件處理程序之間的某種協調 - mousemove,​​和keyup。但我想知道是否有辦法在一個事件處理程序中完全處理它 - mousemove。

示例代碼給什麼，我希望能夠做一個想法...

 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 
       } 

      } 
     } 

是這樣的可能，否則我將不得不在空格鍵的狀態保存到一個類變量使用keydown事件處理程序並用鼠標移動處理程序檢查它？

Answer 1

您應該設置一個變量在你的KeyDown-事件，並檢查它的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

我不得不跟蹤時Keys.Space是在Pressed狀態的變量，然後用KeyUp觸發它， 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來完成。但只適用於像shift，ctrl和alt之類的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中調用GetKeyState。