透明EDIT——保持透明(200分)

怎样才能使EDIT保持透明。在编辑、移动时都可以看到它下一层的控件。

可以做到， 但效果极差(抖动非常厉害)。 劝你不要用

這個是可以,不過問題也同以上仁兄所說一樣...

還有一種方法就比較笨了,如果你的視窗不支持變更顏色的話可以考慮將Edit控件的低色設
成同窗口的顏色一樣不也成了么?

说明：这不是我写的。是Croco的。
手头有一个透明Memo，极短，才100行。把Memo替换成Edit，应是透明Edit。
作者似乎是 CoolForm 的作者，贴在此供参考。
unit TrMemo;
{$R-}
interface

uses
Windows, Messages, Controls, StdCtrls, Classes;

const
TMWM__SpecialInvalidate = WM_USER + 1111;

type
TTransparentMemo = class(TMemo)
private
procedure SpecialInvalidate(var Message:TMessage); message TMWM__SpecialInvalidate;
procedure WMHScroll(var Message: TWMHScroll); message WM_HSCROLL;
procedure WMVScroll(var Message: TWMVScroll); message WM_VSCROLL;
procedure WMSetText(var Message:TWMSetText); message WM_SETTEXT;
procedure CNCTLCOLOREDIT(var Message:TWMCTLCOLOREDIT); message CN_CTLCOLOREDIT;
procedure WMKeyDown(var Message: TWMKeyDown); message WM_KEYDOWN;
procedure WMEraseBkgnd(var Message: TWMEraseBkgnd); message WM_ERASEBKGND;
protected
procedure CreateParams(var Params: TCreateParams); override;
public
constructor Create(AOwner: TComponent); override;
end;

procedure Register;

implementation

{ TTransparentMemo }
procedure TTransparentMemo.WMHScroll(var Message: TWMHScroll);
begin
inherited;
PostMessage(Handle,TMWM__SpecialInvalidate,0,0);
end;

procedure TTransparentMemo.WMVScroll(var Message: TWMVScroll);
begin
SendMessage(Handle,TMWM__SpecialInvalidate,0,0);
inherited;
PostMessage(Handle,TMWM__SpecialInvalidate,0,0);
end;

{procedure TTransparentMemo.CNCTLCOLOREDIT(var Message:TWMCTLCOLOREDIT);
begin
with Message do
begin
SetBkMode(ChildDC,TRANSPARENT);
Result:=GetStockObject(HOLLOW_BRUSH)
end
end;}

procedure TTransparentMemo.WMSetText(var Message:TWMSetText);
begin
inherited;
if not (csDesigning in ComponentState) then
PostMessage(Handle,TMWM__SpecialInvalidate,0,0)
end;

procedure TTransparentMemo.SpecialInvalidate(var Message:TMessage);
var r:TRect;
begin
if Parent<>nil then
begin
r:=ClientRect;
r.TopLeft:=Parent.ScreenToClient(ClientToScreen(r.TopLeft));
r.BottomRight:=Parent.ScreenToClient(ClientToScreen(r.BottomRight));
InvalidateRect(Parent.Handle,@r,true);
RedrawWindow(Handle,nil,0,RDW_FRAME+RDW_INVALIDATE)
end;
end;

procedure TTransparentMemo.WMKeyDown(var Message: TWMKeyDown);
begin
SendMessage(Handle,TMWM__SpecialInvalidate,0,0);
inherited;
PostMessage(Handle,TMWM__SpecialInvalidate,0,0);
end;

procedure TTransparentMemo.WMEraseBkgnd(var Message: TWMEraseBkgnd);
begin
Message.Result := 1;
end;

constructor TTransparentMemo.Create(AOwner: TComponent);
begin
inherited;
ControlStyle := [csCaptureMouse, csDesignInteractive, csClickEvents,
csSetCaption, csOpaque, csDoubleClicks, csReplicatable, csNoStdEvents];
end;

procedure TTransparentMemo.CreateParams(var Params: TCreateParams);
begin
inherited CreateParams(Params);
with Params do
begin
ExStyle:=ExStyle or WS_EX_TRANSPARENT and not WS_EX_WINDOWEDGE
and not WS_EX_STATICEDGE and not WS_EX_DLGMODALFRAME and not WS_EX_CLIENTEDGE;
end;
end;

procedure Register;
begin
RegisterComponents('cool!', [tTransparentMemo]);
end;

end.

谢！