Question

你们所做的一切。我已经覆盖了ProcessKeypreview方法，因此我可以检测到WASD＆＃39;密钥被持有，然后被释放。但是，当发生碰撞时，我遇到了问题，例如当A＆＃39; A＆＃39; A＆＃39;被按下的同时“W＆＃39;已被压制。如何在按住特定键时阻止所有其他键盘操作？

这是我的代码片段：

const int WM_KEYDOWN = 0x0100;
const int WM_KEYUP = 0x0101;
protected override bool ProcessKeyPreview(ref Message m) 
{
    int msgVal = m.WParam.ToInt32();
    if (m.Msg == WM_KEYDOWN)
    {
        switch((Keys)msgVal) {
        case Keys.W:
            Console.WriteLine("W being held");
            break;

        case Keys.A:
            Console.WriteLine("A being held");
            break;
        }
    }

    if (m.Msg == WM_KEYUP) {
        switch((Keys)msgVal) {
            case Keys.W:
                Console.WriteLine("W released");
                break;

            case Keys.A:
                Console.WriteLine("A released");
                break;
        }
    }  
return base.ProcessKeyPreview(ref m);  
}

Answer 1

保持HashSet<Keys>当前正在按下的Keys的一组（Add}按下Remove按键，Contain在键盘上设置的键。

然后，由于您知道按下了多少个键，如果您想在特定键关闭时不再处理任何键，您可以检查您的组return true;是否为键。如果是，则const int WM_KEYDOWN = 0x0101; const int WM_KEYUP = 0x0100; HashSet<Keys> keysDown = new HashSet<Keys>(); protected override bool ProcessKeyPreview(ref Message m) { int msgVal = m.WParam.ToInt32(); if (m.Msg == WM_KEYDOWN) { keysDown.Add((Keys)msgVal); switch((Keys)msgVal) { case Keys.W: Console.WriteLine("W being held"); break; case Keys.A: Console.WriteLine("A being held"); break; } if (keysDown.Contains(keyToCheck)) return true; } if (m.Msg == WM_KEYUP) { switch((Keys)msgVal) { case Keys.W: Console.WriteLine("W released"); break; case Keys.A: Console.WriteLine("A released"); break; } keysDown.Remove((Keys)msgVal); } return base.ProcessKeyPreview(ref m); }。

您的方法应如下所示：

"prevent all other keydowns while a specific key is being held down"

由于您没有指定要检查的密钥（keyToCheck），因此我将其保留为变量Set。您可以更改条件以更改何时忽略按键。

或者，如果要检查的密钥是常量，那么您不需要bool，而只需保留const int WM_KEYDOWN = 0x0101; const int WM_KEYUP = 0x0100; bool keyToCheckDown = false; protected override bool ProcessKeyPreview(ref Message m) { int msgVal = m.WParam.ToInt32(); if (m.Msg == WM_KEYDOWN) { if ((Keys)msgVal == KEY_TO_CHECK) keyToCheckDown = true; switch((Keys)msgVal) { case Keys.W: Console.WriteLine("W being held"); break; case Keys.A: Console.WriteLine("A being held"); break; } // the second condition is necessary so that you don't "return true" the when the key to check is pressed. if (keyToCheckDown && (Keys)msgVal != KEY_TO_CHECK) return true; } if (m.Msg == WM_KEYUP) { switch((Keys)msgVal) { case Keys.W: Console.WriteLine("W released"); break; case Keys.A: Console.WriteLine("A released"); break; } if ((Keys)msgVal == KEY_TO_CHECK) keyToCheckDown = false; } return base.ProcessKeyPreview(ref m); }该密钥是否已关闭：

KEY_TO_CHECK

此常量为{{1}}。

我希望这有帮助！

C＃忽略ProcessKeyPreview中的Keydowns

1 个答案: