請問有辦法做透明的文字輸入方塊嗎 |
答題得分者是:william
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elase
一般會員 發表:4 回覆:23 積分:10 註冊:2003-06-05 發送簡訊給我 |
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william
版主 發表:66 回覆:2535 積分:3048 註冊:2002-07-11 發送簡訊給我 |
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elase
一般會員 發表:4 回覆:23 積分:10 註冊:2003-06-05 發送簡訊給我 |
|
william
版主 發表:66 回覆:2535 積分:3048 註冊:2002-07-11 發送簡訊給我 |
|
elase
一般會員 發表:4 回覆:23 積分:10 註冊:2003-06-05 發送簡訊給我 |
我用的是 TEdit
所以不會有 scroll 的事件發生
可是在 Keyin 的時候就會出現閃動 附上程式碼
unit MYEdit; interface uses SysUtils, Classes, Controls, StdCtrls, Messages, Windows, Forms; type TMYEdit = class(TEdit) private { Private declarations } procedure CNCTLCOLOREDIT(var Message: TWMCTLCOLOREDIT); message CN_CTLCOLOREDIT; procedure WMEraseBkgnd(var Message: TWMEraseBkgnd); message WM_ERASEBKGND; procedure WMKeyDown(var Message: TWMKeyDown); message WM_KEYDOWN; protected { Protected declarations } public { Public declarations } constructor Create(AOwner: TComponent); override; destructor Destroy; override; published { Published declarations } end; procedure Register; implementation procedure Register; begin RegisterComponents('MY Editer', [TMYEdit]); end; { TMYEdit } procedure TMYEdit.CNCTLCOLOREDIT(var Message: TWMCTLCOLOREDIT); begin with Message do begin SetBkMode(ChildDC,TRANSPARENT); Result := GetStockObject(HOLLOW_BRUSH); end; end; constructor TMYEdit.Create(AOwner: TComponent); begin inherited Create(AOwner); Parent := (AOwner as TWinControl); self.BorderStyle:=bsNone; SetWindowLong(Handle,GWL_EXSTYLE,GetWindowLong(Handle,GWL_EXSTYLE) or WS_EX_TRANSPARENT); end; destructor TMYEdit.Destroy; begin inherited Destroy; end; procedure TMYEdit.WMEraseBkgnd(var Message: TWMEraseBkgnd); var ARect: TRect; begin ARect := ClientRect; with ARect do begin TopLeft := Parent.ScreenToClient(ClientToScreen(TopLeft)); BottomRight := Parent.ScreenToClient(ClientToScreen(BottomRight)); end; InvalidateRect(Parent.Handle,@ARect,True); RedrawWindow(Handle,nil,0,RDW_FRAME or RDW_INVALIDATE); Message.Result := 1; end; procedure TMYEdit.WMKeyDown(var Message: TWMKeyDown); begin inherited; Invalidate; end; end. |
william
版主 發表:66 回覆:2535 積分:3048 註冊:2002-07-11 發送簡訊給我 |
Did it work in your machine? On mine (XP Pro SP1), it won't work unless I make it a multi line control, e.g.
TMYEdit = class(TEdit) private { Private declarations } procedure CNCTLCOLOREDIT(var Message: TWMCTLCOLOREDIT); message CN_CTLCOLOREDIT; procedure WMEraseBkgnd(var Message: TWMEraseBkgnd); message WM_ERASEBKGND; procedure WMKeyDown(var Message: TWMKeyDown); message WM_KEYDOWN; protected { Protected declarations } procedure CreateParams(var Params: TCreateParams); override; public { Public declarations } constructor Create(AOwner: TComponent); override; destructor Destroy; override; published { Published declarations } end; ..... procedure TMYEdit.CreateParams(var Params: TCreateParams); begin inherited; Params.Style := Params.Style or ES_MULTILINE; end; ....But then you may need to filter out the return key... WM_CHAR is a good place instead of WM_KEYDOWN > |
elase
一般會員 發表:4 回覆:23 積分:10 註冊:2003-06-05 發送簡訊給我 |
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