Comments on: QGraphicScenes and Delegates http://www.sebruiz.net/262 Sun, 14 Mar 2010 23:15:18 +0000 hourly 1 By: Ian Monroe http://www.sebruiz.net/262/comment-page-1#comment-8104 Ian Monroe Wed, 01 Aug 2007 20:04:11 +0000 http://www.sebruiz.net/262#comment-8104 Well timers are an important part of animations. If its not me explicitly starting the timer, something else is. Well timers are an important part of animations. If its not me explicitly starting the timer, something else is.

]]> By: Travis http://www.sebruiz.net/262/comment-page-1#comment-8092 Travis Wed, 01 Aug 2007 13:56:01 +0000 http://www.sebruiz.net/262#comment-8092 Whatever you do, do _not_ just randomly start firing timers at 40ms. We're trying to get better battery life, not worse. :) Whatever you do, do _not_ just randomly start firing timers at 40ms.

We’re trying to get better battery life, not worse. :)

]]> By: Ian Monroe http://www.sebruiz.net/262/comment-page-1#comment-8034 Ian Monroe Tue, 31 Jul 2007 15:33:34 +0000 http://www.sebruiz.net/262#comment-8034 Tim you mean ditch QListView and create a Interview-view using QGraphicsView? Yea I'm actually thinking doing something like this. I'll just quote myself so I don't have to type it again. :) [10:07] icefox: I thought of a new scheme as I was waking up. (I find during-wakeup to be a very creative part of the day, doesn't mean the idea is any good though) [10:07] in the "QGraphicsView that uses a model to display data" idea [10:09] I subclass QGraphicsItem and in the paint method it would create QGraphicsTextItem's, etc, normal QGV stuff [10:09] and ask the model for what info to put in them [10:09] so this QGraphicsItem would contain the whole row [10:10] then it would call QGraphicsItem::paint and let it do its job of painting everything that had just been setup [10:11] then I could implement a garbage collection system of deleting these QGraphicsItems as they are scrolled out of view (only to be recreated when scrolled back over) Tim you mean ditch QListView and create a Interview-view using QGraphicsView? Yea I’m actually thinking doing something like this. I’ll just quote myself so I don’t have to type it again. :)

[10:07] icefox: I thought of a new scheme as I was waking up. (I find during-wakeup to be a very creative part of the day, doesn’t mean the idea is any good though)
[10:07] in the “QGraphicsView that uses a model to display data” idea
[10:09] I subclass QGraphicsItem and in the paint method it would create QGraphicsTextItem’s, etc, normal QGV stuff
[10:09] and ask the model for what info to put in them
[10:09] so this QGraphicsItem would contain the whole row
[10:10] then it would call QGraphicsItem::paint and let it do its job of painting everything that had just been setup
[10:11] then I could implement a garbage collection system of deleting these QGraphicsItems as they are scrolled out of view (only to be recreated when scrolled back over)

]]> By: Tim http://www.sebruiz.net/262/comment-page-1#comment-8015 Tim Tue, 31 Jul 2007 10:53:22 +0000 http://www.sebruiz.net/262#comment-8015 Can't you just have very lightweight objects in a QGraphicsScene? They only really need to store a handle to the file which wouldn't take much space and then you can have cache/uncache functions for when they get near the view. Also you'll probably want a custom index as they are all in a line. Can’t you just have very lightweight objects in a QGraphicsScene? They only really need to store a handle to the file which wouldn’t take much space and then you can have cache/uncache functions for when they get near the view. Also you’ll probably want a custom index as they are all in a line.

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