May 2002
Intermediate to advanced
646 pages
18h 57m
English
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Exercises
Explain the purpose of the
assumeInside:flag in the addTrackingRect:owner:userData:assumeInside: method.Why do you think it is necessary to manually add a tracking rectangle to an NSView in order to have that NSView track the mouse? Why is it necessary to make the tracking view the first responder?
Instead of being added to a separate display list, the annotations could have been integrated with the primary display list. Try to implement the program in this manner. What are the advantages and disadvantages of this approach?
Modify the GraphPaper application so that the displayed formula changes color when you move the mouse over it.
Further modify the GraphPaper application so that you can click the formula and drag it to other locations in the GraphView window.
Investigate the NSFormatter class. Instead of specifying the string values “x:” and “y:” in the mouseMoved: event, create your own NSFormatter that prepends these labels to the floating-point value before it is displayed. Which approach is better — using an NSFormatter or creating the formatted display in the mouseMoved: event?
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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.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.