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鼠标编程小技巧二则

[摘要]作者:土人 一.通过鼠标在屏幕上的移动来控件程序界面本例通过鼠标在屏幕上的移动来控制程序窗体的显示与隐藏:当鼠标移动到窗体所在区域时窗体显示,反之隐藏起来。仅需一条API函数:GetCursorPos。注意:如果需要将API函数置于模块中请对代码作相应修改。要尝试本例,需给标准EXE工程缺省添加一...
作者:土人
一.通过鼠标在屏幕上的移动来控件程序界面

本例通过鼠标在屏幕上的移动来控制程序窗体的显示与隐藏:当鼠标移动到窗体所在区域时窗体显示,反之隐藏起来。仅需一条API函数:GetCursorPos。注意:如果需要将API函数置于模块中请对代码作相应修改。要尝试本例,需给标准EXE工程缺省添加一个Timer控件。

Private Type POINTAPI
x As Long
y As Long
End Type

Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long

Private Sub Form_Load()
Me.Visible = False
Timer1.Enabled = True
Timer1.Interval = 100
End Sub

Private Sub Timer1_Timer()
Dim lResult As Long
Dim lpPoint As POINTAPI
Dim iCounter As Integer
lResult = GetCursorPos(lpPoint)
If lpPoint.x < Me.Left \ Screen.TwipsPerPixelX Or lpPoint.x > (Me.Left + _
Me.Width) \ Screen.TwipsPerPixelX Or lpPoint.y < Me.Top \ _
Screen.TwipsPerPixelY Or lpPoint.y - 10 > (Me.Top + Me.Height) \ _
Screen.TwipsPerPixelY Then
Me.Visible = False '鼠标在窗体区域之外时
Else
Me.Visible = True '鼠标在窗体区域之内时
End If
End Sub

二.获得Mouse_Exit事件

所谓Mouse_Exit事件,是指鼠标指针离开某一控件所应发生的事件。本例是通过Form_MouseMove事件来判断鼠标指针是在窗体之内还是窗体之外的,你可根据需要作相应改动。请给窗体缺省创建一个按钮(用于观察效果)。

Private Declare Function SetCapture Lib "user32" (ByVal hWnd As Long) As Long
Private Declare Function ReleaseCapture Lib "user32" () As Long

Private Sub Form_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
Dim MouseExit As Boolean
MouseExit = (0 <= X) And (X <= Me.Width) And (0 <= Y) And (Y <= Me.Height)
If MouseExit Then
Me.Caption = "鼠标指针在窗体范围内"
Command1.Enabled = True
SetCapture Me.hWnd
Else
Me.Caption = "鼠标指针在窗体范围外"
Command1.Enabled = False
ReleaseCapture
End If
End Sub