同样的东西似乎不适用于键盘。是否有可能知道,例如,Shift键是否被按下?
是否绝对有必要追踪每一个键盘通知(按键和按键事件)?
发布于 2018-03-27 09:02:08
if ((Control.ModifierKeys & Keys.Shift) != 0)
如果Ctrl+Shift下降,这也将是正确的。如果你想检查是否只按下了换挡,
if (Control.ModifierKeys == Keys.Shift)
如果在继承Control
(例如窗体),可以删除Control.
发布于 2018-03-27 10:11:46
下面的代码是如何检测几乎所有当前按下的键,而不仅仅是Shift键。
private KeyMessageFilter m_filter = new KeyMessageFilter();
private void Form1_Load(object sender, EventArgs e)
{
Application.AddMessageFilter(m_filter);
}
public class KeyMessageFilter : IMessageFilter
{
private const int WM_KEYDOWN = 0x0100;
private const int WM_KEYUP = 0x0101;
private bool m_keyPressed = false;
private Dictionary<Keys, bool> m_keyTable = new Dictionary<Keys, bool>();
public Dictionary<Keys, bool> KeyTable
{
get { return m_keyTable; }
private set { m_keyTable = value; }
}
public bool IsKeyPressed()
{
return m_keyPressed;
}
public bool IsKeyPressed(Keys k)
{
bool pressed = false;
if (KeyTable.TryGetValue(k, out pressed))
{
return pressed;
}
return false;
}
public bool PreFilterMessage(ref Message m)
{
if (m.Msg == WM_KEYDOWN)
{
KeyTable[(Keys)m.WParam] = true;
m_keyPressed = true;
}
if (m.Msg == WM_KEYUP)
{
KeyTable[(Keys)m.WParam] = false;
m_keyPressed = false;
}
return false;
}
}
https://stackoverflow.com/questions/-100007797
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