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用VB6创建带光栅的超级开始菜单

技术开发2024-06-13 阅读()
(一)编程原理;



  由于windows自身并未提供这项接口函数,因此我们必须从分析菜单的实质入手,我认为任何菜单实质上是一个没有标题栏的窗体,菜单项目是某些控件(如标签控件),通过监测鼠标是否移动到控件上而相应的改变控件的背景色和填充色,从而达到相应的目的,当然另外一项关键是如何制造出那一个倒立着的写着“windows98”字样的标题,这需要我们调用复杂的系统函数来实现。



  (二)编程实践;



  (1)运行vb6,建立一个标准exe工程,添加命名为form1的窗体,放上一个command控件“command1”,caption=“开始”,调整到适当的位置,双击窗体,写入以下代码:



  Private Sub Command1_Click()



  frmTest.Show ‘当开始按钮被点击时激活超级菜单



  End Sub



  Private Sub Form_Load()



  Me.left = (Screen.Width - Me.Width) / 2



  Me.tOp = (Screen.Height - Me.Height) / 2 ‘窗体位置居中



  End Sub



  Private Sub Form_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)



  If frmTest.Visible = True Then



  Unload frmTest



  End If ‘当鼠标离开菜单时卸载菜单



  End Sub



  Private Sub Form_Unload(Cancel As Integer)



  End ‘结束程序



  End Sub



  (2) 添加命名为frmtest的窗体,添加一个picturebox控件,命名为piclogo,采用默认值就行了,添加控件数组label1(1--6)(读者可以根据自己的需要添加),caption=“菜单项目”,添加一个image控件,将它的图片设计为自己喜欢的图片,移动窗体和图片到适当位置,双击窗体,写入以下代码:



  Option Explicit



  Dim cL As New cLogo ‘引用类模块



  Private Sub Form_Load()



  Me.left = Form1.left



  Me.tOp = Form1.tOp - Form1.Height ‘指定窗体位置



  Me.Caption = App.Title ‘窗体标题



  cL.DrawingObject = picLogo ‘指定piclogo为载体



  cL.Caption = ″ 欢迎使用国产软件! --zouhero 2000 ″‘文本



  cL.StartColor = vbBlue ‘前段颜色-蓝色



  cL.EndColor = vbRed ‘后段颜色-红色



  End Sub



  Private Sub Form_Resize()



  On Error Resume Next



  picLogo.Height = Me.ScaleHeight



  cL.Draw



  End Sub



  Private Sub Label1_Click(Index As Integer)



  MsgBox ″你选择了菜单″ & Index, vbExclamation



  ’在这里添加你的相应代码



  End Sub



  Private Sub Label1_MouseMove(Index As Integer, Button As Integer, Shift As Integer, X As Single, Y As Single)



  Dim i As Integer ‘当鼠标移动标签控件时,前景色变成白色,背景色变成蓝色



   Label1(Index).BackColor = vbBlue



   Label1(Index).ForeColor = &HFFFFFF



   For i = 0 To Label1.Count - 1 ‘其他标签颜色恢复原状



  If i = Index Then GoTo aa



  Label1(i).BackColor = vbButtonFace



  Label1(i).ForeColor = &H0



  aa:



  Next ‘恢复除选定标签外的所有标签的前景色和背景色



  End Sub ‘代码结束



  (3)选择“工程”菜单-“添加类模块”,命名为clogo,写入以下代码:



  Option Explicit ’以下是令人眼花缭乱的win api引用



  Private Type RECT



  left As Long



  tOp As Long



  Right As Long



  Bottom As Long



  End Type



  Private Declare Function FillRect Lib ″user32″ (ByVal hDC As Long, lpRect As RECT, ByVal hBrush As Long) As Long



  Private Declare Function CreateSolidBrush Lib ″gdi32″ (ByVal crColor As Long) As Long



  Private Declare Function TextOut Lib ″gdi32″ Alias ″TextOutA″ (ByVal hDC As Long, ByVal x As Long, ByVal y As Long, ByVal lpString As String, ByVal nCount As Long) As Long



  Private Declare Function GetDeviceCaps Lib ″gdi32″ (ByVal hDC As Long, ByVal nIndex As Long) As Long



  Private Const LOGPIXELSX = 88



  Private Const LOGPIXELSY = 90



  Private Declare Function MulDiv Lib ″kernel32″ (ByVal nNumber As Long, ByVal nNumerator As Long, ByVal nDenominator As Long) As Long



  Private Const LF_FACESIZE = 32



  Private Type LOGFONT



  lfHeight As Long



  lfWidth As Long



  lfEscapement As Long



  lfOrientation As Long



  lfWeight As Long



  lfItalic As Byte



  lfUnderline As Byte



  lfStrikeOut As Byte



  lfCharSet As Byte



  lfOutPrecision As Byte



  lfClipPrecision As Byte



  lfQuality As Byte



  lfPitchAndFamily As Byte



  lfFaceName(LF_FACESIZE) As Byte



  End Type



  Private Declare Function CreateFontIndirect Lib ″gdi32″ Alias ″CreateFontIndirectA″ (lpLogFont As LOGFONT) As Long



  Private Declare Function SelectObject Lib ″gdi32″ (ByVal hDC As Long, ByVal hObject As Long) As Long



  Private Declare Function DeleteObject Lib ″gdi32″ (ByVal hObject As Long) As Long



  Private Const FW_NORMAL = 400



  Private Const FW_BOLD = 700



  Private Const FF_DONTCARE = 0



  Private Const DEFAULT_QUALITY = 0



  Private Const DEFAULT_PITCH = 0



  Private Const DEFAULT_CHARSET = 1



  Private Declare Function OleTranslateColor Lib ″OLEPRO32.DLL″ (ByVal OLE_COLOR As Long, ByVal HPALETTE As Long, pccolorref As Long) As Long



  Private Const CLR_INVALID = -1



  Private m_picThis As PictureBox



  Private m_sCaption As String



  Private m_bRGBStart(1 To 3) As Integer



  Private m_oStartColor As OLE_COLOR



  Private m_bRGBEnd(1 To 3) As Integer



  Private m_oEndColor As OLE_COLOR ’api声明结束



  ’以下代码建立建立类模块的出入口函数



  Public Property Let Caption(ByVal sCaption As String) ’



  m_sCaption = sCaption



  End Property



  Public Property Get Caption() As String ’标题栏文字



  Caption = m_sCaption



  End Property



  Public Property Let DrawingObject(ByRef picThis As PictureBox)‘指定目标图片



  Set m_picThis = picThis



  End Property



  Public Property Get StartColor() As OLE_COLOR ‘StartColor = m_oStartColor



  End Property



  Public Property Let StartColor(ByVal oColor As OLE_COLOR) ‘指定前段颜色



  Dim lColor As Long



  If (m_oStartColor <> oColor) Then



  m_oStartColor = oColor



  OleTranslateColor oColor, 0, lColor



  m_bRGBStart(1) = lColor And &HFF&



  m_bRGBStart(2) = ((lColor And &HFF00&) \ &H100)



  m_bRGBStart(3) = ((lColor And &HFF0000) \ &H10000)



  If Not (m_picThis Is Nothing) Then



  Draw



  End If



  End If



  End Property



  Public Property Get EndColor() As OLE_COLOR



  EndColor = m_oEndColor



  End Property



  Public Property Let EndColor(ByVal oColor As OLE_COLOR) ‘指定后段颜色



  Dim lColor As Long



  If (m_oEndColor <> oColor) Then



  m_oEndColor = oColor



  OleTranslateColor oColor, 0, lColor



  m_bRGBEnd(1) = lColor And &HFF&



  m_bRGBEnd(2) = ((lColor And &HFF00&) \ &H100)



  m_bRGBEnd(3) = ((lColor And &HFF0000) \ &H10000)



  If Not (m_picThis Is Nothing) Then



  Draw



  End If



  End If



  End Property



  Public Sub Draw() ‘画背景颜色



  Dim lHeight As Long, lWidth As Long



  Dim lYStep As Long



  Dim lY As Long



  Dim bRGB(1 To 3) As Integer



  Dim tLF As LOGFONT



  Dim hFnt As Long



  Dim hFntOld As Long



  Dim lR As Long



  Dim rct As RECT



  Dim hBr As Long



  Dim hDC As Long



  Dim dR(1 To 3) As Double



  On Error GoTo DrawError



  hDC = m_picThis.hDC



  lHeight = m_picThis.Height \ Screen.TwipsPerPixelY



  rct.Right = m_picThis.Width \ Screen.TwipsPerPixelY



  lYStep = lHeight \ 255



  If (lYStep = 0) Then



  lYStep = 1



  End If



  rct.Bottom = lHeight



  bRGB(1) = m_bRGBStart(1)



  bRGB(2) = m_bRGBStart(2)



  bRGB(3) = m_bRGBStart(3)



  dR(1) = m_bRGBEnd(1) - m_bRGBStart(1)



  dR(2) = m_bRGBEnd(2) - m_bRGBStart(2)



  dR(3) = m_bRGBEnd(3) - m_bRGBStart(3)



  For lY = lHeight To 0 Step -lYStep



  rct.tOp = rct.Bottom - lYStep



  hBr = CreateSolidBrush((bRGB(3) * &H10000 + bRGB(2) * &H100& + bRGB(1)))



  FillRect hDC, rct, hBr



  DeleteObject hBr



  rct.Bottom = rct.tOp



  bRGB(1) = m_bRGBStart(1) + dR(1) * (lHeight - lY) / lHeight



  bRGB(2) = m_bRGBStart(2) + dR(2) * (lHeight - lY) / lHeight



  bRGB(3) = m_bRGBStart(3) + dR(3) * (lHeight - lY) / lHeight



  Next lY



  pOLEFontToLogFont m_picThis.Font, hDC, tLF



  tLF.lfEscapement = 900



  hFnt = CreateFontIndirect(tLF)



  If (hFnt <> 0) Then



  hFntOld = SelectObject(hDC, hFnt)



  lR = TextOut(hDC, 0, lHeight - 16, m_sCaption, Len(m_sCaption))



  SelectObject hDC, hFntOld



  DeleteObject hFnt



  End If



  m_picThis.Refresh



  Exit Sub



  DrawError:



  Debug.Print ″Problem: ″ & Err.Description



  End Sub



  Private Sub pOLEFontToLogFont(fntThis As StdFont, hDC As Long, tLF As LOGFONT) ‘文字字体



  Dim sFont As String



  Dim iChar As Integer



  With tLF



  sFont = fntThis.Name



  For iChar = 1 To Len(sFont)



  .lfFaceName(iChar - 1) =CByte(Asc(Mid$(sFont, iChar, 1)))



  Next iChar



  .lfHeight = -MulDiv((fntThis.Size), (GetDeviceCaps(hDC, LOGPIXELSY)), 72)



  .lfItalic = fntThis.Italic



  If (fntThis.Bold) Then



  .lfWeight = FW_BOLD



  Else



  .lfWeight = FW_NORMAL



  End If



  .lfUnderline = fntThis.Underline



  .lfStrikeOut = fntThis.Strikethrough



  End With



  End Sub



  Private Sub Class_Initialize()



  StartColor = &H0



  EndColor = vbButtonFace



  End Sub ‘模块定义结束



  调试、运行。


……

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