Arrow Keys in NSSlider

[Raglan T. Tiger]

In a window are multiple views. One view contains an NSSlider.  I would like to 
move the slider with arrow keys.

I have subclassed NSSlider, added a -keyDown: method,and  
-acceptsFirstResponder that returns YES.

-keyDown is not being called.

What more do I need do ?



 -rags



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Re: Arrow Keys in NSSlider

[Lee Ann Rucker]

NSSlider does normally respond to keystrokes if you’ve turned on Full Keyboard 
Access in System Prefs > Keyboard > Shortcuts. If it works with that but not 
with your changes, it’s doing something complicated you’ll have to adjust for. 
I’ve only subclassed it to enhance the snapping behavior, I never tried to make 
it work with FKA off.

On Sep 8, 2015, at 1:28 PM, Raglan T. Tiger  wrote:

> In a window are multiple views. One view contains an NSSlider.  I would like 
> to move the slider with arrow keys.
> 
> I have subclassed NSSlider, added a -keyDown: method,and  
> -acceptsFirstResponder that returns YES.
> 
> -keyDown is not being called.
> 
> What more do I need do ?

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Re: Arrow Keys in NSSlider

[Mike Abdullah]

> On 8 Sep 2015, at 21:28, Raglan T. Tiger  wrote:
> 
> In a window are multiple views. One view contains an NSSlider.  I would like 
> to move the slider with arrow keys.
> 
> I have subclassed NSSlider, added a -keyDown: method,and  
> -acceptsFirstResponder that returns YES.
> 
> -keyDown is not being called.
> 
> What more do I need do ?

What sort of event is actually taking place to make the slider the first 
responder?


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Re: Arrow Keys in NSSlider

[Quincey Morris]

On Sep 8, 2015, at 13:28 , Raglan T. Tiger  wrote:
> 
> What more do I need do ?

It’s hard to say, but at the very least you’ll actually need to *make* the 
NSSlider first responder, which means you’ll have to click it first or tab to 
it.

You also don’t say what you think should happen if arrow keys should be pressed 
when some other view (e.g. a text field) is first responder.

Most likely, your solution will involved the following:

— Implement ‘keyDown’ in a view or controller higher up in the responder chain, 
an object that normally doesn’t respond to keystrokes.

— In your ‘keyDown’ override, invoke ‘interpretKeyEvents’ to handle the arrow 
keys.

— In a suitable controller class (possibly the same one), implement 
‘moveUp/Down/Left/Right:’ action methods to deal with the slider.

— Filter out or reroute other events that aren’t relevant.

See the Cocoa Event Handling Guide (Handling Key Events) for more details.



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Re: Arrow Keys in NSSlider

[Raglan T. Tiger]

Coolio, I will get on these suggestion, thx!

-rags



> On Sep 8, 2015, at 2:47 PM, Quincey Morris 
>  wrote:
> 
> On Sep 8, 2015, at 13:28 , Raglan T. Tiger  wrote:
>> 
>> What more do I need do ?
> 
> It’s hard to say, but at the very least you’ll actually need to *make* the 
> NSSlider first responder, which means you’ll have to click it first or tab to 
> it.
> 
> You also don’t say what you think should happen if arrow keys should be 
> pressed when some other view (e.g. a text field) is first responder.
> 
> Most likely, your solution will involved the following:
> 
> — Implement ‘keyDown’ in a view or controller higher up in the responder 
> chain, an object that normally doesn’t respond to keystrokes.
> 
> — In your ‘keyDown’ override, invoke ‘interpretKeyEvents’ to handle the arrow 
> keys.
> 
> — In a suitable controller class (possibly the same one), implement 
> ‘moveUp/Down/Left/Right:’ action methods to deal with the slider.
> 
> — Filter out or reroute other events that aren’t relevant.
> 
> See the Cocoa Event Handling Guide (Handling Key Events) for more details.
> 
> 
> 
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