Transparent memo: Can't change font color
Hi All,
I have the following component which works fine but I have got a small problem with it.
My problem is with changing the font colour.
When I add this memo into my form: I can change the font type and style but font colour doesn't change no matter what colour I put it is always keeping the default colour which is black.
Any ideas how this can be be done?
Here is the Transparent memo component:
{code}
unit TransparentMemo;
{$R-}
interface
uses
Windows, Messages, SysUtils, Classes, Vcl.Controls, Vcl.StdCtrls;
const
TMWM_SpecialInvalidate = WM_USER + 1111;
type
TTransparentMemo = class(TMemo)
private
procedure WMNCHitTest(var Msg: TWMNCHitTest); message WM_NCHITTEST;
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.WMNCHitTest(var Msg: TWMNCHitTest);
begin
inherited;
if Msg.Result = HTTRANSPARENT then Msg.Result := HTCLIENT;
end;
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('Custom Components', [TTransparentMemo]);
end;
end.
{code}
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0 |
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daniel
2/23/2014 3:26:28 PM
public.delphi.vcl.writing
510 articles. 
0 followers.
3 Replies
874 Views
daniel Legrand wrote:
> Hi All,
> I have the following component which works fine but I have got a
> small problem with it. My problem is with changing the font colour.
> When I add this memo into my form: I can change the font type and
> style but font colour doesn't change no matter what colour I put it
> is always keeping the default colour which is black.
>
You should set the font color in the CNCTLCOLOREDIT method:
{code}
procedure TTransparentMemo.CNCTLCOLOREDIT(var Message: TWMCTLCOLOREDIT);
begin
with Message do
begin
SetTextColor(ChildDC, Font.Color);
SetBkMode(ChildDC, TRANSPARENT);
Result := GetStockObject(HOLLOW_BRUSH);
end;
end;
{code}
|
|
0 |
|
Lajos
2/25/2014 6:25:50 PM
> {quote:title=Lajos Juhasz wrote:}{quote}
> daniel Legrand wrote:
>
> > Hi All,
> > I have the following component which works fine but I have got a
> > small problem with it. My problem is with changing the font colour.
> > When I add this memo into my form: I can change the font type and
> > style but font colour doesn't change no matter what colour I put it
> > is always keeping the default colour which is black.
> >
>
> You should set the font color in the CNCTLCOLOREDIT method:
>
>
> {code}
> procedure TTransparentMemo.CNCTLCOLOREDIT(var Message: TWMCTLCOLOREDIT);
> begin
> with Message do
> begin
> SetTextColor(ChildDC, Font.Color);
> SetBkMode(ChildDC, TRANSPARENT);
> Result := GetStockObject(HOLLOW_BRUSH);
> end;
> end;
> {code}
Hi Lajos,
I don't really know how to thank you!
It works like charm, and I hope someone else also who need similar kind of memo will get the benefit of this.
Thank you very much!, i do very much appreciate this :)
best regards
-daniel
|
|
0 |
|
daniel
2/26/2014 11:13:03 AM
daniel Legrand wrote:
> > {quote:title=Lajos Juhasz wrote:}{quote}
> > daniel Legrand wrote:
> >
> > > Hi All,
> > > I have the following component which works fine but I have got a
> > > small problem with it. My problem is with changing the font
> > > colour. When I add this memo into my form: I can change the font
> > > type and style but font colour doesn't change no matter what
> > > colour I put it is always keeping the default colour which is
> > > black.
> > >
> >
> > You should set the font color in the CNCTLCOLOREDIT method:
> >
> >
> > {code}
> > procedure TTransparentMemo.CNCTLCOLOREDIT(var Message:
> > TWMCTLCOLOREDIT); begin
> > with Message do
> > begin
> > SetTextColor(ChildDC, Font.Color);
> > SetBkMode(ChildDC, TRANSPARENT);
> > Result := GetStockObject(HOLLOW_BRUSH);
> > end;
> > end;
> > {code}
>
> Hi Lajos,
> I don't really know how to thank you!
> It works like charm, and I hope someone else also who need similar
> kind of memo will get the benefit of this. Thank you very much!, i
> do very much appreciate this :)
>
> best regards
> -daniel
You're welcome. I used this problem to run away from my problems.
Luckily today I was able to solve my backlog.
|
|
0 |
|
Lajos
2/26/2014 5:21:37 PM
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