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[英]How to change selected text attribute into bold in TMemo in delphi 7 ?
[英]Transparent TMemo - text appears to remain selected when it isn't
我希望在Delphi 7中获得有关透明TMemo控件的帮助。我在网上找到了一些行之有效的代码,在一定程度上刷新率有点令人讨厌,但我可以接受。 主要问题是未选择的文本看起来就像是实际被选择的一样。
这是使用SelectAll()选择所有文本的地方;
在这里,实际上没有选择任何文本,但是以前已经选择过该文本,请注意,浮行提示键入将在“改进”中的“ p”之后进行。
最后是一张图片,显示了差异。
我觉得很奇怪的是,例如,当我按下箭头键时,错误的突出显示消失了,但是当使用鼠标时却没有。
此自定义TMemo的代码如下:
unit TrMemo;
interface
uses
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
uses Windows;
{ 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('Samples', [tTransparentMemo]);
end;
end.
任何提示/提示/答案将不胜感激! 提前加油!
这不是一个完整的修复程序,但是您可以例如执行以下操作
protected
procedure Click; override;
procedure TTransparentMemo.Click;
begin
PostMessage(Handle,TMWM__SpecialInvalidate,0,0);
inherited;
end;
等等。 也许有更好的地方可以做到这一点。 在您的VCL源(StdCtrls.pas)一看,你会发现在一些TCustomEdit
或TCustomMemo
这将是更好的选择覆盖。
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