如何在PB中实现透明DATAWINDOW？

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$PBExportHeader$w_trans.srw
forward
global type w_trans from Window
end type
type p_2 from picture within w_trans
end type
type st_2 from statictext within w_trans
end type
type st_1 from statictext within w_trans
end type
type dw_2 from datawindow within w_trans
end type
type dw_1 from datawindow within w_trans
end type
type p_1 from picture within w_trans
end type
end forward

global type w_trans from Window
int X=1056
int Y=480
int Width=2574
int Height=1700
boolean TitleBar=true
string Title="透明DW测试"
long BackColor=15780518
boolean ControlMenu=true
boolean MinBox=true
boolean MaxBox=true
boolean Resizable=true
event ue_paint pbm_paint
event ue_1024 pbm_custom01
p_2 p_2
st_2 st_2
st_1 st_1
dw_2 dw_2
dw_1 dw_1
p_1 p_1
end type
global w_trans w_trans

type prototypes
function long BitBlt ( long hdcdest, long xdest, long ydest, long nwidth,long nheight,long hdcsrc, long xsrc, long ysrc, long dwrop ) library "gdi32"
function long CreateBitmap ( long nwidth, long nheight, long nplanes, long nbitcount, long lpbits ) library "gdi32"
function long SetBkColor ( long hdc, long crcolor ) library "gdi32"
function long SelectObject ( long hdc, long hobject ) library "gdi32"
function long CreateCompatibleBitmap ( long hdc, long nwidth, long nheight ) library "gdi32"
function long CreateCompatibleDC ( long hdc ) library "gdi32"
function long DeleteDC ( long hdc ) library "gdi32"
function long DeleteObject ( long hobject ) library "gdi32"
function long GetDC ( long hwnd ) library "user32"
function Integer ReleaseDC ( long hwnd, long hdc ) library "user32"

end prototypes
type variables

Long il_SrcDC, il_DstDC,il_MapDstDC_Old,il_MapDstHandle, il_OldMapDstHandle,il_SrcWidth,il_SrcHeight,il_color

constant long SRCCOPY = 13369376
constant long NOTSRCCOPY = 3342344
constant long SRCAND = 8913094
constant long SRCINVERT = 6684742

dragobject io_obj

long il_count

OLEObject demo
end variables
forward prototypes
public subroutine wf_maketrans ()
public subroutine wf_makedc ()
public subroutine wf_maketrans ()
public subroutine wf_makedc ()
end prototypes

event ue_paint;//post wf_formbak()
end event

event ue_1024;messagebox("demo","demo")
end event

public subroutine wf_maketrans ();long ll_oldBackGround
Long ll_MapSrcDc,ll_MapDstDC
Long ll_MapSrcHandle, ll_OldMapSrcHandle,ll_MapDstHandle,ll_OldMapDstHandle
Long ll_maskDC, ll_InvertDC, ll_maskHandle, ll_InvertHandle, ll_oldMaskHandle, ll_OldInvertHandle

ll_maskDc = CreateCompatibleDC(il_SrcDC)
ll_maskHandle = CreateBitmap(il_SrcWidth, il_SrcHeight, 1, 1, 0)
ll_OldMaskHandle = SelectObject(ll_MaskDC, ll_MaskHandle)

ll_InvertDC = CreateCompatibleDC(ll_maskDc)
ll_InvertHandle = CreateBitmap(il_SrcWidth, il_SrcHeight, 1, 1, 0)
ll_OldInvertHandle = SelectObject(ll_InvertDC, ll_InvertHandle)

ll_oldBackGround = SetBkColor(il_SrcDC, il_color)
BitBlt(ll_maskDc, 0, 0, il_SrcWidth, il_SrcHeight, il_SrcDC, 0, 0, SRCCOPY)
SetBkColor(il_SrcDC, ll_oldBackGround)

BitBlt( ll_invertDC, 0, 0,il_SrcWidth, il_SrcHeight, ll_maskDC, 0, 0, NOTSRCCOPY)

ll_MapDstDC = CreateCompatibleDC(il_mapdstdc_old)
ll_MapDstHandle = CreateCompatibleBitmap(il_mapdstdc_old, il_SrcWidth, il_SrcHeight)
ll_OldMapDstHandle = SelectObject(ll_MapDstDC, ll_MapDstHandle)

ll_MapSrcDC = CreateCompatibleDC(il_SrcDC)
ll_MapSrcHandle = CreateCompatibleBitmap(il_SrcDC, il_SrcWidth, il_SrcHeight)
ll_OldMapSrcHandle = SelectObject(ll_MapSrcDC, ll_MapSrcHandle)

BitBlt(ll_MapSrcDC, 0, 0, il_SrcWidth, il_SrcHeight, il_SrcDC, 0, 0, SRCCOPY)

BitBlt(ll_MapSrcDc, 0, 0, il_SrcWidth, il_SrcHeight, ll_InvertDC, 0, 0, SRCAND)

BitBlt(ll_MapDstDC, 0, 0, il_SrcWidth, il_SrcHeight, il_MapDstDC_Old, 0,0, SRCCOPY)

BitBlt(ll_MapDstDC, 0, 0, il_SrcWidth, il_SrcHeight, ll_MaskDC, 0, 0 ,SRCAND)

BitBlt(ll_MapDstDC, 0, 0, il_SrcWidth, il_SrcHeight, ll_MapSrcDC, 0 ,0 , SRCINVERT)

BitBlt(il_SrcDC,0,0,il_SrcWidth,il_SrcHeight,ll_MapDstDC,0,0, SRCCOPY)

ll_MaskHandle = SelectObject(ll_MaskDC, ll_OldMaskHandle)
DeleteObject(ll_MaskHandle)
DeleteDC(ll_MaskDC)

ll_Inverthandle = SelectObject(ll_InvertDC, ll_OldInvertHandle)
DeleteObject(ll_InvertHandle)
DeleteDC(ll_InvertDC)

ll_MapSrcHandle = SelectObject(ll_MapSrcDC, ll_OldMapSrcHandle)
DeleteObject(ll_MapSrchandle)
DeleteDC(ll_MapSrcDC)

ll_MapDstHandle = SelectObject(ll_MapDstDC, ll_OldMapDstHandle)
DeleteObject(ll_MapDsthandle)
DeleteDC(ll_MapDstDC)
end subroutine
public subroutine wf_makedc ();Integer DRAWX, DRAWY

il_SrcWidth = UnitsToPixels(io_obj.Width, XUnitsToPixels!)
il_SrcHeight = UnitsToPixels(io_obj.Height, YUnitsToPixels!)

DRAWX = UnitsToPixels(io_obj.X, XUnitsToPixels!)
DRAWY = UnitsToPixels(io_obj.Y, YUnitsToPixels!)

il_MapDstDC_Old = CreateCompatibleDC(il_DstDC)
il_MapDstHandle = CreateCompatibleBitmap(il_DstDC, il_SrcWidth, il_SrcHeight)
il_OldMapDstHandle = SelectObject(il_MapDstDC_Old, il_MapDstHandle)

io_obj.Hide()

p_1.setredraw(true)

BitBlt(il_MapDstDC_Old, 0, 0, il_SrcWidth, il_SrcHeight, il_DstDC, DRAWX, DRAWY, SRCCOPY)

io_obj.show()
end subroutine

on w_trans.create
this.p_2=create p_2
this.st_2=create st_2
this.st_1=create st_1
this.dw_2=create dw_2
this.dw_1=create dw_1
this.p_1=create p_1
this.Control[]={this.p_2,&
this.st_2,&
this.st_1,&
this.dw_2,&
this.dw_1,&
this.p_1}
end on

on w_trans.destroy
destroy(this.p_2)
destroy(this.st_2)
destroy(this.st_1)
destroy(this.dw_2)
destroy(this.dw_1)
destroy(this.p_1)
end on

event open;io_obj = dw_1
il_color = rgb(255,255,255)

il_DstDC = GetDC(Handle(io_obj.Getparent()))
il_SrcDC = GetDC(Handle(io_obj))

dw_1.insertrow(0)
dw_2.insertrow(0)

post wf_makedc()
end event
event close;ReleaseDC(handle(this),il_DstDC)
ReleaseDC(handle(this),il_SrcDC)

il_MapDstHandle = SelectObject(il_MapDstDC_Old, il_OldMapDstHandle)
DeleteObject(il_MapDstHandle)
DeleteDC(il_MapDstDC_Old)

end event
type p_2 from picture within w_trans
int X=1490
int Y=252
int Width=677
int Height=1216
string PictureName="c:\qq2000\newskins\雅典奥运\background.bmp"
boolean FocusRectangle=false
end type

type st_2 from statictext within w_trans
int X=1326
int Y=80
int Width=928
int Height=96
boolean Enabled=false
string Text="普通DW演示："
boolean FocusRectangle=false
long TextColor=33554432
long BackColor=15780518
int TextSize=-12
int Weight=400
string FaceName="Arial"
FontCharSet FontCharSet=Ansi!
FontFamily FontFamily=Swiss!
FontPitch FontPitch=Variable!
end type

type st_1 from statictext within w_trans
int X=123
int Y=88
int Width=928
int Height=96
boolean Enabled=false
string Text="透明DW演示："
boolean FocusRectangle=false
long TextColor=33554432
long BackColor=15780518
int TextSize=-12
int Weight=400
string FaceName="Arial"
FontCharSet FontCharSet=Ansi!
FontFamily FontFamily=Swiss!
FontPitch FontPitch=Variable!
end type

type dw_2 from datawindow within w_trans
int X=1358
int Y=336
int Width=992
int Height=1036
int TabOrder=20
boolean BringToTop=true
string DataObject="demo"
boolean Border=false
boolean HScrollBar=true
boolean VScrollBar=true
boolean LiveScroll=true
end type

type dw_1 from datawindow within w_trans
event lbuttondown pbm_lbuttondown
event lbuttonup pbm_lbuttonup
event ue_paint pbm_paint
int X=110
int Y=336
int Width=992
int Height=1036
int TabOrder=10
boolean BringToTop=true
string DataObject="demo"
boolean Border=false
boolean HScrollBar=true
boolean VScrollBar=true
boolean LiveScroll=true
end type

event ue_paint;post wf_maketrans()
end event
event rowfocuschanging;//this.visible = false
//this.visible = true
wf_maketrans()
//this.setfocus()
end event
event scrollvertical;wf_maketrans()
end event
type p_1 from picture within w_trans
int X=233
int Y=252
int Width=677
int Height=1216
string PictureName="c:\qq2000\newskins\雅典奥运\background.bmp"
boolean FocusRectangle=false
end type