Swift noob: just want the coordinates of the mouse

[matt martin]

Hi 

I'm new to Swift, coming from some knowledge of Java. I'm working on an app that needs to do something any time the mouse is moved. VERY SIMPLE!!

I have searched and searched, and tried to understand how to use Objective-C things like NSMouseMoved or setup a NSTrackingArea, but find myself lost in the weeds without a CS education.

thanks!

Matt

[Jens Alfke]

On Apr 21, 2015, at 1:28 PM, matt martin <johnmat...@gmail.com> wrote:

I'm new to Swift, coming from some knowledge of Java. I'm working on an app that needs to do something any time the mouse is moved. VERY SIMPLE!!

Welcome! But you’re asking a question about the Cocoa frameworks, not about the Swift language. The best place to ask for help with Cocoa is either the cocoa-dev mailing list or Apple’s developer forums.

(And BTW the reason this isn’t as simple as you’d think is that the OS wants to limit the number of events it sends the app — event handling consumes CPU and energy. So tracking areas are a way for the app to find out when the cursor position changes in a meaningful way without having to receive hundreds of events every time the mouse moves. It’s possible to get an event every time the mouse moves, but that takes a bit more work because few apps need to do it.)

—Jens

[matt martin]

Yes, I see your point. I guess I'm just surprised there is no simple get.mouseX and get.mouseY methods for us to use. I'm probably ditching this project now!

thanks for the reply.

Matt

[matt martin]

But wait, there is a mouseMoved function in Swift. How do I utilize this?

https://developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSResponder_Class/index.html#//apple_ref/doc/uid/20000015-SW2

[Jim Dovey]

That’s not “in Swift” either I’m afraid. It’s a method implemented by subclasses of NSResponder, which is part of Cocoa. You’re still better off asking the cocoa-dev mailing list about that one.

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[matt martin]

Sorry to bother you! I understand that what I was looking at was not "pure" Swift, but a Swift implementation

[Adam Sharp]

It's no problem! Hope you find what you're looking for soon.

> On 22 Apr 2015, at 9:16 am, matt martin <johnmat...@gmail.com> wrote:
>
> I understand that what I was looking at was not "pure" Swift, but a Swift implementation

Just to be clear, what you're seeing is not actually a Swift *implementation*, but the *interface* translated to Swift. NSResponder is part of Cocoa and is implemented in Objective-C, it just happens that the API is bridged to Swift, and thus the documentation is showing you the Swift translation of it.

I'm using the terms "translate" and "bridge" loosely, but I hope that clears things up for you a little.

–Adam