我正在寻找一种方法来检测用户是否已经空闲了5分钟然后做了一些事情,如果他回来时该事情会停止,例如计时器.
这是我尝试过的(但这只会检测form1是否处于非活动状态/未点击或任何事情)：
Public Class Form1
Private Sub form1_Load(ByVal sender As Object,ByVal e As System.EventArgs) Handles Me.Load
'You should have already set the interval in the designer...
Timer1.Start()
End Sub
Private Sub form1_KeyPress(ByVal sender As Object,ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Me.KeyPress
Timer1.Stop()
Timer1.Start()
End Sub
Private Sub form1_MouseMove(ByVal sender As Object,ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove
Timer1.Stop()
Timer1.Start()
End Sub
Private Sub form1_MouseClick(ByVal sender As Object,ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseClick
Timer1.Stop()
Timer1.Start()
End Sub
Private Sub Timer_Tick(ByVal sender As Object,ByVal e As System.EventArgs) Handles Timer1.Tick
MsgBox("Been idle for to long") 'I just have the program exiting,though you could have it do whatever you want.
End Sub
End Class
通过在主窗体中实现IMessageFilter接口,可以轻松完成此操作.它允许您在调度之前嗅探输入消息.当您看到用户操作鼠标或键盘时重新启动计时器.
删除主窗体上的计时器并将Interval属性设置为超时.从2000开始,你可以看到它的工作.然后使主窗体中的代码如下所示：
Public Class Form1
Implements IMessageFilter
Public Sub New()
InitializeComponent()
Application.AddMessageFilter(Me)
Timer1.Enabled = True
End Sub
Public Function PreFilterMessage(ByRef m As Message) As Boolean Implements IMessageFilter.PreFilterMessage
'' Retrigger timer on keyboard and mouse messages
If (m.Msg >= &H100 And m.Msg <= &H109) Or (m.Msg >= &H200 And m.Msg <= &H20E) Then
Timer1.Stop()
Timer1.Start()
End If
End Function
Private Sub Timer1_Tick(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Timer1.Tick
Timer1.Stop()
MessageBox.Show("Time is up!")
End Sub
End Class