这很简单, 窗体无边框,你只要用API判断一下鼠标所在位置是不是在屏幕边,是再显示窗体即可,否则窗体高度为20就是一条线.
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最早的时候有个叫东方快车的软件是这样的,后来,我也做了一个和他一样的,不过好久没用这个API,一下想不起来了.你可以搜一下.
帮你做了一个
label1,timer1自己加一个,窗体BorderStyle=0
Option Explicit
Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
Private Type POINTAPI
X As Long
Y As Long
End Type
Dim p As POINTAPI
Private Enum emL
none = 0
Top = 1
Left = 2
Right = 3
End Enum
Dim pWhere As emL
Private onMove As Boolean, AutoHide As Boolean
Private iX As Single
Private iY As Single
Private blShow As Boolean
Private blIn As Boolean
Private myH As Single, myW As Single
Private Sub Form_Load()
myH = Me.Height
myW = Me.Width
Me.Label1.Move 0, 0, Me.ScaleWidth
Me.Timer1.Interval = 5
Me.Timer1.Enabled = True
End Sub
Private Sub Label1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
iX = X
iY = Y
onMove = True
End Sub
Private Sub Label1_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single)
onMove = False
End Sub
Private Sub Timer1_Timer()
GetCursorPos p
p.X = p.X * Screen.TwipsPerPixelX
p.Y = p.Y * Screen.TwipsPerPixelY
If AutoHide Then
If ((p.X 100 And pWhere = Left) Or (p.Y 100 And pWhere = Top) Or (Screen.Width - p.X 100 And pWhere = Right)) Or _
(p.X Me.Left And p.X Me.Width + Me.Left And p.Y Me.Top And p.Y Me.Top + Me.Height) Then
If Not blIn Then
blIn = True
Me.Height = myH
Me.Width = myW
If pWhere = Right Then Me.Left = Screen.Width - Me.Width
End If
Else
If blIn Then
blIn = False
Select Case pWhere
Case emL.Left
Me.Width = 20
Case emL.Right
Me.Width = 20
Me.Left = Screen.Width - 30
Case emL.Top
Me.Height = 20
Case Else
End Select
End If
End If
End If
If onMove Then
Me.Top = p.Y - iY
Me.Left = p.X - iX
If Me.Left 100 Then
pWhere = Left
AutoHide = True
Me.Left = 0
ElseIf Screen.Width - Me.Left - Me.Width 100 Then
Me.Left = Screen.Width - Me.Width
pWhere = Right
AutoHide = True
Else
If Me.Top 100 Then
Me.Top = 0
AutoHide = True
pWhere = Top
Else
AutoHide = False
Me.Width = myW
Me.Height = myH
End If
End If
End If
End Sub
Public Class Form3 按下,显示控件,并获得焦点. Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click TextBox1.Visible = True TextBox1.Focus() End Sub 判断是否获得焦点. Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click If TextBox1.Focused = True Then MessageBox.Show("已经获得焦点了.") Else MessageBox.Show("已经失去焦点了.") End If End Sub 失去焦点后自动陷藏. Private Sub TextBox1_LostFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles TextBox1.LostFocus TextBox1.Visible = False End Sub End Class
计算TOP
left值
可以判断是否顶端，左侧。
加上高和宽即可判断是否在下端和右侧。
若当窗体靠近边界在50以内，则处理窗体进行到隐藏。也就是将窗体移出界面。只保留50在外面。当鼠标移动时将窗体展开即可。