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Cocoa Programming for OS X: The Big Nerd Ranch Guide
book

Cocoa Programming for OS X: The Big Nerd Ranch Guide

by Aaron Hillegass, Adam Preble, Nate Chandler
April 2015
Intermediate to advanced
556 pages
17h 47m
English
Big Nerd Ranch Guides
Content preview from Cocoa Programming for OS X: The Big Nerd Ranch Guide

For the More Curious: Rollovers

Three mouse event methods were not discussed in Chapter 18: mouseMoved(_:), mouseEntered(_:), and mouseExited(_:).

To receive mouseMoved(_:), the view’s window needs to accept mouse moved events. If it does, the mouseMoved(_:) message is sent to the window’s first responder. To set the window to get mouse moved events, set the acceptsMouseMovedEvents property to true:

window?.acceptsMouseMovedEvents = true

At this point, the view will be sent the message every time the mouse moves. This is a lot of events. When people ask about mouse moved events, we ask them why they want it. They usually say, “Uh, rollovers.”

Rollovers are very popular with hyperlinks. As you roll over a region, its appearance ...

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