The disabled TBitBtn flickers, because the grayed image is created
during paint. TSpeedButton does not gray the image, but paints delayed
(gtk1 intf). So it might flicker less for small buttons.
Aaaah, okay, that explains it - but also means it won't work for me.
The 'grayed' effect is fairly
On Thu, 31 May 2007 09:14:52 +0200
A.J. Venter [EMAIL PROTECTED] wrote:
The disabled TBitBtn flickers, because the grayed image is created
during paint. TSpeedButton does not gray the image, but paints
delayed (gtk1 intf). So it might flicker less for small buttons.
Aaaah, okay, that
It seems, gtk_pixmap is creating the disabled image on-the-fly on first
paint. So, the flickering is built-in. Because you change the image
often, you see it often.
Conclusion:
gtk1+TBitBtn+disabled = flicker
So the short version is - that GTK1 couldn't do what I needed (a
dynamically updated
On Wed, 30 May 2007 10:34:45 +0200
A.J. Venter [EMAIL PROTECTED] wrote:
It seems, gtk_pixmap is creating the disabled image on-the-fly on
first paint. So, the flickering is built-in. Because you change the
image often, you see it often.
Conclusion:
gtk1+TBitBtn+disabled = flicker
So
gtk1+TBitBtn+disabled = flicker
So the short version is - that GTK1 couldn't do what I needed (a
dynamically updated but often disabled set of buttons with pictures on
them) without creating a new component.
Maybe you can try TSpeedButton instead of TBitBtn.
That would only work if I
On Wed, 30 May 2007 13:56:55 +0200
A.J. Venter [EMAIL PROTECTED] wrote:
gtk1+TBitBtn+disabled = flicker
So the short version is - that GTK1 couldn't do what I needed (a
dynamically updated but often disabled set of buttons with
pictures on them) without creating a new component.
Maybe you can try TSpeedButton instead of TBitBtn.
That would only work if I painted the Caption myself would it not ?
TSpeedButton has a Caption. Default is ''.
In
which case... it gets even MORE custom painting... not sure it's worth
it.
Did you try?
Heh, point made :)
Question then:
On Wed, 30 May 2007 22:17:57 +0200
A.J. Venter [EMAIL PROTECTED] wrote:
Maybe you can try TSpeedButton instead of TBitBtn.
That would only work if I painted the Caption myself would it
not ?
TSpeedButton has a Caption. Default is ''.
In
which case... it gets even MORE
An updated (related) question would be whether there is any way to
remove the flicker in THIS case:
I have a couple of TBitBtn components. Appart from their captions and
glyphs, I actually write some information to the canvasses which are
meant to show up ON TOP of each glyph. A button may or
On 5/29/07, Felipe Monteiro de Carvalho
[EMAIL PROTECTED] wrote:
On 5/29/07, A.J. Venter [EMAIL PROTECTED] wrote:
I have a couple of TBitBtn components. Appart from their captions and
glyphs, I actually write some information to the canvasses which are
meant to show up ON TOP of each glyph.
AJ,
In my case, when the image is redrawn, the TImage was cleared which
showed the underlying colour (clBtnFace), which caused the flicker when
the black background was painted in.
I'm not sure of how relevant it would be in your case, but I changed the
colour of the underlying panel to
Well I've reduced the flicker a little by doing a few small things
(mostly not reloading images unless they have changed).
I also set the DoubleBuffered property of the components to true,
though I see no effect from doing so nor do I know what effect it's
supposed to have.
My understanding of
On Tue, 29 May 2007 11:26:02 +0200
A.J. Venter [EMAIL PROTECTED] wrote:
Well I've reduced the flicker a little by doing a few small things
(mostly not reloading images unless they have changed).
I also set the DoubleBuffered property of the components to true,
though I see no effect from
DoubleBuffered is a hint for the interface.
The gtk2 intf always paints double buffered for each gdkwindow.
That means paint events are double buffered, other painting not. The
gtk1 intf has almost no doublebuffering. I'm not sure about
the other interfaces.
Aaah okay, that makes sense.
I only
Hi,
I am just making a wild guess, so if it sounds absurd, please ignore. :-)
How about creating a dummy invisible button, and use that one as a buffer
for all the other buttons. So, everytime you need to update a button, rather
make the dummy what you want, then somehow copy the canvas of the
Zitat von A.J. Venter [EMAIL PROTECTED]:
DoubleBuffered is a hint for the interface.
The gtk2 intf always paints double buffered for each gdkwindow.
That means paint events are double buffered, other painting not. The
gtk1 intf has almost no doublebuffering. I'm not sure about
the other
I used TPaintBox... it's work better than Timage when Drawing (OnPaint)
You can try it
Gustavo Enrique Jimenez [EMAIL PROTECTED] wrote:
2007/5/28, Dave Coventry [EMAIL PROTECTED]: Gustavo Enrique Jimenez wrote:
There are good tutorials/examples on
On Tue, 29 May 2007 15:11:48 +0200
Mattias Gärtner [EMAIL PROTECTED] wrote:
Zitat von A.J. Venter [EMAIL PROTECTED]:
DoubleBuffered is a hint for the interface.
The gtk2 intf always paints double buffered for each gdkwindow.
That means paint events are double buffered, other painting
I'm getting an awful lot of screen flicker from the following code:
== snip
Form1.Image1.Canvas.Pen.Color:=$FF;
Form1.Image1.Canvas.Pen.Mode:=pmNot;
Form1.Image1.Canvas.MoveTo(iCornerX,CornerY);
Form1.Image1.Canvas.LineTo(PrevX,PrevY);
Hi
I'm getting an awful lot of screen flicker from the following code:
== snip
Form1.Image1.Canvas.Pen.Color:=$FF;
Form1.Image1.Canvas.Pen.Mode:=pmNot;
Form1.Image1.Canvas.MoveTo(iCornerX,CornerY);
Gustavo Enrique Jimenez wrote:
There are good tutorials/examples on
http://wiki.lazarus.freepascal.org/Developing_with_Graphics
http://wiki.lazarus.freepascal.org/Developing_with_Graphics
Gustavo,
Thank you for your reply.
But they don't really help.
Do you draw a line to the
2007/5/28, Dave Coventry [EMAIL PROTECTED]:
Gustavo Enrique Jimenez wrote:
There are good tutorials/examples on
http://wiki.lazarus.freepascal.org/Developing_with_Graphics
http://wiki.lazarus.freepascal.org/Developing_with_Graphics
Gustavo,
Thank you for your reply.
But they don't really
On 5/28/07, Gustavo Enrique Jimenez [EMAIL PROTECTED] wrote:
ps: for the record, Felipe Monteiro help me A LOT in private mails. Thanks
Felipe, and excuse me for bother you in private.
No problem =)
--
Felipe Monteiro de Carvalho
Gustavo,
My problem was caused by the fact that the background for my TImage was
black. When I placed it on a black-coloured panel (I used a TScrollBox
as I want to capture mousewheel events), I found the flicker was more or
less unoticeable.
Gustavo Enrique Jimenez wrote:
2007/5/28,
24 matches
Mail list logo
