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首页 - 经验之谈 - 用VB6建立带光栅的超级开始菜单
发表评论(0)作者:新天, 平台:VB6.0+Win98, 阅读:9852, 日期:2000-11-17
用VB6建立带光栅的超级开始菜单

   编程爱好者一定对windows98中非常惹眼的“开始”菜单羡慕不已,但是微软公司似乎对它的这个杰作存心垄断,它没有提供任何可供借用的方法来实现,笔者一直对此心存芥蒂,于是决定自己动手制作,let’s go !


  (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。