U++ framework: U++ TheIDE and Library: Releases and ChangeLogs

Home » Developing U++ » U++ TheIDE and Library: Releases and ChangeLogs » NoBackground

Show: Today's Messages :: Polls :: Message Navigator
E-mail to friend

NoBackground [message #7344]

Sat, 23 December 2006 09:41

mirek
Messages: 14290
Registered: November 2005

Ultimate Member

EditField, ArrayCtrl, LineEdit, DocEdit, ColumnList, TreeCtrl now have "NoBackground" option.

If active, background is no painted, so anything begind widget is visible.

Method activates Transparent too. Anyway, alternative use is to override Paint method (drawing the background and then original Paint method) - in this case it is more optimal to setup the mode back to Opaque.

Mirek

Report message to a moderator

Re: NoBackground [message #7353 is a reply to message #7344]

Sat, 23 December 2006 11:41

fallingdutch
Messages: 258
Registered: July 2006

Experienced Member

What is the difference between NoBackground and Transparent then?

Bas

Report message to a moderator

Re: NoBackground [message #7354 is a reply to message #7353]

Sat, 23 December 2006 11:51

mirek
Messages: 14290
Registered: November 2005

Ultimate Member

fallingdutch wrote on Sat, 23 December 2006 05:41

What is the difference between NoBackground and Transparent then?

Bas

Good question. I was sitting at the issue for 20 minutes before deciding that two are distinct.

The reason is described above: You might want to provide thr background by overriding Paint method. In that case, Transparent is not necessary. And it is slower than "direct" painting. So by keeping features distinct, you can achieve better performance in special cases.

Mirek

Report message to a moderator

Previous Topic:	U++ now in namespace Upp.....
Next Topic:	TreeCtrl / ArrayCtrl / ColumnList unification

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Tue Apr 28 02:01:06 GMT+2 2026

Total time taken to generate the page: 0.00412 seconds