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How to set transparency level for static rectangle? [message #909]

Wed, 08 February 2006 02:22

fudadmin
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Registered: November 2005
Location: Kaunas, Lithuania

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How to set transparency level for static rectangle or other controls?

I have this code(one rect semi-covers the other):

#include <CtrlLib/CtrlLib.h>


GUI_APP_MAIN
{
	TopWindow w;
	Array<StaticRect> fr;

	fr.Add();
	fr[0].SetRect(50,50,100,100);
	fr[0].Color(SRed);
	fr.Add();
	fr[1].SetRect(100,100,100,100);
	fr[1].Color(SBlue);
		
	
	w.Add(fr[0]);
	w.Add(fr[1]);
	
	
	w.Run();
}

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Re: How to set transparency level for static rectangle? [message #912 is a reply to message #909]

Wed, 08 February 2006 08:06

mirek
Messages: 13976
Registered: November 2005

Ultimate Member

SetColor(Null);
Transparent();

Not that "Transparent" is in fact just painting hint - in theory, all would work with this flag ON for all Ctrls. However, to avoid flickering, only Ctrls that really are transparent should have this activated.

Also, if what you need is StaticRect that is always transparent, rather use ParentCtrl.

Mirek

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Re: How to set transparency level for static rectangle? [message #913 is a reply to message #912]

Wed, 08 February 2006 09:01

fudadmin
Messages: 1321
Registered: November 2005
Location: Kaunas, Lithuania

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luzr wrote on Wed, 08 February 2006 02:06

Where is THE LEVEL? I can't see any numbers.
I want:
SetColor(SRed, alpha=50%);

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Re: How to set transparency level for static rectangle? [message #914 is a reply to message #913]

Wed, 08 February 2006 09:04

mirek
Messages: 13976
Registered: November 2005

Ultimate Member

I see... Well, alpha-blended drawing is not supported.

You can SetAlpha for top-level Ctrl - it it will work on WinXP, but that is all for the moment.

(The problem is that alpha-blending is not supported by base platforms).

Mirek

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Re: How to set transparency level for static rectangle? [message #915 is a reply to message #909]

Wed, 08 February 2006 09:12

fudadmin
Messages: 1321
Registered: November 2005
Location: Kaunas, Lithuania

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do you suggest to use primitive DC and bitblt? Smile

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Re: How to set transparency level for static rectangle? [message #916 is a reply to message #915]

Wed, 08 February 2006 09:42

mirek
Messages: 13976
Registered: November 2005

Ultimate Member

Actually, what I suggest is that DC/BitBlt (and its X11 equivalents) do not support alpha-blending (AFAIK).

However, it is possible that I misundestood what you really need...

What kind of operation do you want to do with BitBlt?

Mirek

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Re: How to set transparency level for static rectangle? [message #997 is a reply to message #916]

Mon, 13 February 2006 12:05

fudadmin
Messages: 1321
Registered: November 2005
Location: Kaunas, Lithuania

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luzr wrote on Wed, 08 February 2006 03:42

I'd like this kind
index.php?t=getfile&id=65&private=0

also you can check more at:
http://www.blitzbasic.com/bpdocs/command_list_gui_cat.php?sh ow=HTML%20Views

Attachment: macoside_big.png
(Size: 250.79KB, Downloaded 2067 times)

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Re: How to set transparency level for static rectangle? [message #998 is a reply to message #997]

Mon, 13 February 2006 12:29

mirek
Messages: 13976
Registered: November 2005

Ultimate Member

Well, you can have this: it is window-level alpha blending, supported by Ctrl::SetAlpha.

The only problem you have to be aware of is that unlike all other things, you can use SetAlpha just for windows that are open at the moment (this is not U++ way, perhaps I should fix that..)

Try (untested):

GUI_APP_MAIN
{
TopWindow win;
win.Open();
win.SetAlpha(100);
win.Run();
}

Another thing to know is that it does not work before Win2000 or in Linux (is NOP).

BTW, what you cannot have is alpha blending of shapes in your view area (this requires GDI+ on Win32, which is not implicit on all platforms we want to support...)

Mirek

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Re: How to set transparency level for static rectangle? [message #1083 is a reply to message #998]

Sun, 19 February 2006 23:59

fudadmin
Messages: 1321
Registered: November 2005
Location: Kaunas, Lithuania

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Yes, it is working. My mistake was that I had missed win.Open().
Then, experimenting with U++ Ctrl DC's, I realised that in U++ you get hwnd after you open the window.
But now I can't believe that the semi-transparent window is soooo slow comparing to what I get with "pure" win32 API's on my 1.5 Ghz. Could you give some hints about the reason?

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Re: How to set transparency level for static rectangle? [message #1084 is a reply to message #916]

Mon, 20 February 2006 00:04

fudadmin
Messages: 1321
Registered: November 2005
Location: Kaunas, Lithuania

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luzr wrote on Wed, 08 February 2006 03:42

Actually, I want to use not only bitblt but I need hDC's for win32 api's, like SetDIBitsToDevice, StretchDIBits, AlphaBlend etc.

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Re: How to set transparency level for static rectangle? [message #1086 is a reply to message #1083]

Mon, 20 February 2006 01:17

fudadmin
Messages: 1321
Registered: November 2005
Location: Kaunas, Lithuania

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fudadmin wrote on Sun, 19 February 2006 17:59

But now I can't believe that the semi-transparent window is soooo slow comparing to what I get with "pure" win32 API's on my 1.5 Ghz. Could you give some hints about the reason?

There was something strange... It's ok now after I recompiled.

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