滚动条 "_GUIScrollBars_Init" 函数内的UDF问题
下边的代码是从 "_GUIScrollBars_Init" 这个函数例子里边取出来的,本来是按照"_GUIScrollBars_Init" 格式所写滚动条的, 结果是滚动条出来了,拖不动,,然后就尝试照搬的方式把下边的代码另存为了UDF
,加入到我的源代码中,滚动条正常可行.
疑问:为啥按照说明上使用函数无法正常运作, 添加了如下UDF即可运行? 是我的方法不对,还是什么? Func WM_SIZE($hWnd, $Msg, $wParam, $lParam)
#forceref $Msg, $wParam
Local $index = -1, $yChar, $xChar, $xClientMax, $xClient, $yClient, $ivMax
For $x = 0 To UBound($aSB_WindowInfo) - 1
If $aSB_WindowInfo[$x] = $hWnd Then
$index = $x
$xClientMax = $aSB_WindowInfo[$index]
$xChar = $aSB_WindowInfo[$index]
$yChar = $aSB_WindowInfo[$index]
$ivMax = $aSB_WindowInfo[$index]
ExitLoop
EndIf
Next
If $index = -1 Then Return 0
Local $tSCROLLINFO = DllStructCreate($tagSCROLLINFO)
; Retrieve the dimensions of the client area.
$xClient = BitAND($lParam, 0x0000FFFF)
$yClient = BitShift($lParam, 16)
$aSB_WindowInfo[$index] = $xClient
$aSB_WindowInfo[$index] = $yClient
; Set the vertical scrolling range and page size
DllStructSetData($tSCROLLINFO, "fMask", BitOR($SIF_RANGE, $SIF_PAGE))
DllStructSetData($tSCROLLINFO, "nMin", 0)
DllStructSetData($tSCROLLINFO, "nMax", $ivMax)
DllStructSetData($tSCROLLINFO, "nPage", $yClient / $yChar)
_GUIScrollBars_SetScrollInfo($hWnd, $SB_VERT, $tSCROLLINFO)
; Set the horizontal scrolling range and page size
DllStructSetData($tSCROLLINFO, "fMask", BitOR($SIF_RANGE, $SIF_PAGE))
DllStructSetData($tSCROLLINFO, "nMin", 0)
DllStructSetData($tSCROLLINFO, "nMax", 2 + $xClientMax / $xChar)
DllStructSetData($tSCROLLINFO, "nPage", $xClient / $xChar)
_GUIScrollBars_SetScrollInfo($hWnd, $SB_HORZ, $tSCROLLINFO)
Return $GUI_RUNDEFMSG
EndFunc ;==>WM_SIZE
Func WM_HSCROLL($hWnd, $Msg, $wParam, $lParam)
#forceref $Msg, $lParam
Local $nScrollCode = BitAND($wParam, 0x0000FFFF)
Local $index = -1, $xChar, $xPos
Local $Min, $Max, $Page, $Pos, $TrackPos
For $x = 0 To UBound($aSB_WindowInfo) - 1
If $aSB_WindowInfo[$x] = $hWnd Then
$index = $x
$xChar = $aSB_WindowInfo[$index]
ExitLoop
EndIf
Next
If $index = -1 Then Return 0
;~ ; Get all the horizontal scroll bar information
Local $tSCROLLINFO = _GUIScrollBars_GetScrollInfoEx($hWnd, $SB_HORZ)
$Min = DllStructGetData($tSCROLLINFO, "nMin")
$Max = DllStructGetData($tSCROLLINFO, "nMax")
$Page = DllStructGetData($tSCROLLINFO, "nPage")
; Save the position for comparison later on
$xPos = DllStructGetData($tSCROLLINFO, "nPos")
$Pos = $xPos
$TrackPos = DllStructGetData($tSCROLLINFO, "nTrackPos")
#forceref $Min, $Max
Switch $nScrollCode
Case $SB_LINELEFT ; user clicked left arrow
DllStructSetData($tSCROLLINFO, "nPos", $Pos - 1)
Case $SB_LINERIGHT ; user clicked right arrow
DllStructSetData($tSCROLLINFO, "nPos", $Pos + 1)
Case $SB_PAGELEFT ; user clicked the scroll bar shaft left of the scroll box
DllStructSetData($tSCROLLINFO, "nPos", $Pos - $Page)
Case $SB_PAGERIGHT ; user clicked the scroll bar shaft right of the scroll box
DllStructSetData($tSCROLLINFO, "nPos", $Pos + $Page)
Case $SB_THUMBTRACK ; user dragged the scroll box
DllStructSetData($tSCROLLINFO, "nPos", $TrackPos)
EndSwitch
;~ // Set the position and then retrieve it.Due to adjustments
;~ // by Windows it may not be the same as the value set.
DllStructSetData($tSCROLLINFO, "fMask", $SIF_POS)
_GUIScrollBars_SetScrollInfo($hWnd, $SB_HORZ, $tSCROLLINFO)
_GUIScrollBars_GetScrollInfo($hWnd, $SB_HORZ, $tSCROLLINFO)
;// If the position has changed, scroll the window and update it
$Pos = DllStructGetData($tSCROLLINFO, "nPos")
If ($Pos <> $xPos) Then _GUIScrollBars_ScrollWindow($hWnd, $xChar * ($xPos - $Pos), 0)
Return $GUI_RUNDEFMSG
EndFunc ;==>WM_HSCROLL
Func WM_VSCROLL($hWnd, $Msg, $wParam, $lParam)
#forceref $Msg, $wParam, $lParam
Local $nScrollCode = BitAND($wParam, 0x0000FFFF)
Local $index = -1, $yChar, $yPos
Local $Min, $Max, $Page, $Pos, $TrackPos
For $x = 0 To UBound($aSB_WindowInfo) - 1
If $aSB_WindowInfo[$x] = $hWnd Then
$index = $x
$yChar = $aSB_WindowInfo[$index]
ExitLoop
EndIf
Next
If $index = -1 Then Return 0
; Get all the vertial scroll bar information
Local $tSCROLLINFO = _GUIScrollBars_GetScrollInfoEx($hWnd, $SB_VERT)
$Min = DllStructGetData($tSCROLLINFO, "nMin")
$Max = DllStructGetData($tSCROLLINFO, "nMax")
$Page = DllStructGetData($tSCROLLINFO, "nPage")
; Save the position for comparison later on
$yPos = DllStructGetData($tSCROLLINFO, "nPos")
$Pos = $yPos
$TrackPos = DllStructGetData($tSCROLLINFO, "nTrackPos")
Switch $nScrollCode
Case $SB_TOP ; user clicked the HOME keyboard key
DllStructSetData($tSCROLLINFO, "nPos", $Min)
Case $SB_BOTTOM ; user clicked the END keyboard key
DllStructSetData($tSCROLLINFO, "nPos", $Max)
Case $SB_LINEUP ; user clicked the top arrow
DllStructSetData($tSCROLLINFO, "nPos", $Pos - 1)
Case $SB_LINEDOWN ; user clicked the bottom arrow
DllStructSetData($tSCROLLINFO, "nPos", $Pos + 1)
Case $SB_PAGEUP ; user clicked the scroll bar shaft above the scroll box
DllStructSetData($tSCROLLINFO, "nPos", $Pos - $Page)
Case $SB_PAGEDOWN ; user clicked the scroll bar shaft below the scroll box
DllStructSetData($tSCROLLINFO, "nPos", $Pos + $Page)
Case $SB_THUMBTRACK ; user dragged the scroll box
DllStructSetData($tSCROLLINFO, "nPos", $TrackPos)
EndSwitch
;~ // Set the position and then retrieve it.Due to adjustments
;~ // by Windows it may not be the same as the value set.
DllStructSetData($tSCROLLINFO, "fMask", $SIF_POS)
_GUIScrollBars_SetScrollInfo($hWnd, $SB_VERT, $tSCROLLINFO)
_GUIScrollBars_GetScrollInfo($hWnd, $SB_VERT, $tSCROLLINFO)
;// If the position has changed, scroll the window and update it
$Pos = DllStructGetData($tSCROLLINFO, "nPos")
If ($Pos <> $yPos) Then
_GUIScrollBars_ScrollWindow($hWnd, 0, $yChar * ($yPos - $Pos))
$yPos = $Pos
EndIf
Return $GUI_RUNDEFMSG
EndFunc ;==>WM_VSCROLL 注册消息没有，这段是消息控制
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