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发表于 2007-6-13 15:32:00
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VB5 以后的 VB 版本都有提供一个属性 -- ToolTipText，目的是让使用者在执行阶段，鼠标在物件上徘徊约一秒时，就将该物件的提示字串显示在该物件下面的一个小长方形中，以协助使用者做输入动作。
有时候说明字串太长了，于是就有人想将提示字串分行显示，而且自然而然的使用 vbNewLine (=vbCrLf 或 =vbCr ) 来
，因为根据以往的经验，VB都是这样做
的，可是这一次很多人都踢到铁板了！
VB 用来显示 ToolTipText 的提示框，其实是一个文字框，而且 MultiLine 属性并没有设为 True，您可以自己用一个单行式的文字框来做测试，就算您用 vbCrLf 来
也不会有作用的！
既然 VB 提供的 Default 功能不能满足我们的需求，而我们又想提供使用者多行式的提示框，那要怎么办呢？其实也不难，我们自己动手 DIY 一下就有了，而且程序码也不长！
'首先在 Form 上放一个 Timer (如果需要的话)，以便于叫出突现式说明框
Private Function TimeOut(pInterval As Single)
Dim sngTimer As Single
sngTimer = Timer
Do While Timer '如果上面的方法不合意:
'看这段代码:
Public Const TTS_ALWAYSTIP = &H1
Public Const TTS_NOPREFIX = &H2
Public Const TTS_BALLOON = &H40
Public Const CW_USEDEFAULT = &H80000000
Public Const WS_POPUP = &H80000000
Public Const WM_USER = &H400
' 提示的消息
Public Const TTM_SETDELAYTIME = (WM_USER + 3)
Public Const TTM_ADDTOOL = (WM_USER + 4)
Public Const TTM_SETTIPBKCOLOR = (WM_USER + 19)
Public Const TTM_SETTIPTEXTCOLOR = (WM_USER + 20)
Public Const TTM_GETTIPBKCOLOR = (WM_USER + 22)
Public Const TTM_GETTIPTEXTCOLOR = (WM_USER + 23)
Public Const TTM_SETMAXTIPWIDTH = (WM_USER + 24)
Public Const TTDT_AUTOMATIC = 0
Public Const TTDT_RESHOW = 1
Public Const TTDT_AUTOPOP = 2
Public Const TTDT_INITIAL = 3
Public Const TTF_IDISHWND = &H1
Public Const TTF_CENTERTIP = &H2
Public Const TTF_SUBCLASS = &H10
Public Type TOOLINFO
cbSize As Long
uFlags As Long
hWnd As Long
uId As Long
cRect As RECT
hinst As Long
lpszText As String
End Type
Public Declare Function CreateWindowEx Lib "user32" Alias "CreateWindowExA" (ByVal dwExStyle As Long, ByVal lpClassName As String, ByVal lpWindowName As String, ByVal dwStyle As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hWndParent As Long, ByVal hMenu As Long, ByVal hInstance As Long, lpParam As Any) As Long
Public Declare Function DestroyWindow Lib "user32" (ByVal hWnd As Long) As Long
Public Declare Function SendMessageLong Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Declare Sub InitCommonControls Lib "comctl32.dll" ()
Public bCreated As Boolean, hTT As Long
Public hCreated() As Long
Public Sub CreateTTWindow(hParent As Long, Optional bBalloon As Boolean = False)
Dim h As Long, lStyle As Long
lStyle = TTS_NOPREFIX Or TTS_ALWAYSTIP
InitCommonControls
If bBalloon Then lStyle = lStyle Or TTS_BALLOON
hTT = CreateWindowEx(0, "tooltips_class32", 0, lStyle, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, hParent, 0, App.hInstance, 0)
If hTT = 0 Then MsgBox "错误！无法建立工具提示窗口！", vbCritical, "错误"
If Not bCreated Then
ReDim hCreated(0)
bCreated = True
Else
ReDim Preserve hCreated(UBound(hCreated) + 1)
End If
hCreated(UBound(hCreated)) = hTT
End Sub
Public Sub SetToolTip(objTT As Object, sTipText As String, Optional BKColor As Long = &HEEFFFF, Optional TxtColor As Long = vbBlack, Optional MaxWidth As Long = 300, Optional DelayTime As Long = 500, Optional VisibleTime As Long = 2000, Optional bCenter As Boolean = False)
Dim TI As TOOLINFO
With TI
GetClientRect objTT.hWnd, .cRect
.hWnd = objTT.hWnd
.uFlags = TTF_IDISHWND Or TTF_SUBCLASS
If bCenter Then
.uFlags = .uFlags Or TTF_CENTERTIP
End If
.uId = objTT.hWnd
.lpszText = sTipText
.cbSize = Len(TI)
End With
SendMessageLong hTT, TTM_SETMAXTIPWIDTH, 0, MaxWidth
SendMessageLong hTT, TTM_SETDELAYTIME, TTDT_INITIAL, DelayTime
SendMessageLong hTT, TTM_SETDELAYTIME, TTDT_AUTOPOP, VisibleTime
SendMessageLong hTT, TTM_SETTIPTEXTCOLOR, TxtColor, 0&
SendMessageLong hTT, TTM_SETTIPBKCOLOR, BKColor, 0&
SendMessage hTT, TTM_ADDTOOL, 0, TI
End Sub
Public Sub DestroyTT()
If Not bCreated Then Exit Sub
Dim i As Integer
For i = 0 To UBound(hCreated)
DestroyWindow hCreated(i)
Next
End Sub
'使用方法: Form_Load里先CreateTT
'然后把需要的控件统统SetTooltip
'在 Form_Unload里DestoryTT
'支持
!
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