动态裁剪窗体标题栏

本文演示了如何利用API进行窗体标题栏的裁剪和恢复，一并演示了控件的动态添加方法：

'This sample show you how to cut the caption title exactly and create controls with code.
'add a new form ,do nothing but copy this codes for it.
Option Explicit
Private Declare Function CreateRectRgn Lib "gdi32" (ByVal x1 As Long, ByVal y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Private Declare Function SetWindowRgn Lib "user32" (ByVal hWnd As Long, ByVal hRgn As Long, ByVal bRedraw As Boolean) As Long
Private Declare Function GetSystemMetrics Lib "user32" (ByVal nIndex As Long) As Long

Private WithEvents cmd1 As CommandButton
Private WithEvents cmd2 As CommandButton
Private Sub cmd1_Click() '******************
Dim capheight As Long, area As Long
Me.ScaleMode = 2
Me.ForeColor = vbRed
Me.Line (1, 0)-(Me.Width, 0) '紧贴标题栏画线做标记
capheight = GetSystemMetrics(33) + GetSystemMetrics(4) ' 边框宽度+标题栏高度
area = CreateRectRgn(0, capheight, Me.Width, Me.Height) '画无标题栏的矩形框
area = SetWindowRgn(Me.hWnd, area, True) '裁剪标题栏
End Sub
Private Sub cmd2_Click() '*******************
Me.ScaleMode = 2
Dim area As Long
area = CreateRectRgn(0, 0, Me.Width, Me.Height) '画含标题栏的矩形框
area = SetWindowRgn(Me.hWnd, area, True) '恢复标题栏
End Sub
Private Sub Form_Load()
Me.WindowState = 0
Me.Move (Screen.Width - Me.Width) / 2, (Screen.Height - Me.Height) / 2, 8000, 5000'居中及设置窗体大小
Set cmd1 = Controls.Add("VB.CommandButton", "cmd1", Me)'添加cmd1按纽
Set cmd2 = Controls.Add("VB.CommandButton", "cmd2", Me)'添加cmd2按纽
cmd1.Move 1000, 1000, 1500, 500
cmd2.Move 3000, 1000, 1500, 500
cmd1.Caption = "裁剪标题栏"
cmd2.Caption = "恢复标题栏"
cmd1.Visible = True
cmd2.Visible = True
End Sub