July 2010
Intermediate to advanced
560 pages
14h 45m
English
Content preview from Advanced Qt Programming: Creating Great Software with C++ and Qt 4
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11. Creating Graphics/View Windows
By reimplementing a custom QWidget subclass’s paintEvent() and using a QPainter, we can draw anything we want. This is ideal for custom widgets, but is not at all convenient if we want to draw lots of individual items, especially if we want to provide the user with the ability to interact with the items. For example, in the past some users have created graphical applications using literally thousands of custom widgets to stand as graphical items, and although widget painting is very fast, handling a single mouse click in such situations could easily consume almost the whole CPU’s processing capability. Fortunately, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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