> Create implementation of NSAccessibilitySlider protocol 
> https://developer.apple.com/documentation/appkit/nsaccessibilityslider
> 
> The implementation has the function performIncrement and performDecrement to 
> increase/decrease the value of slider using the VoiceOver. To implement this 
> functionality, I could think of  following two ways. I have chosen the first 
> one here though it is more intrusive.
> 1. Make the AccessibleJSlider class implement the AccessibleAction interface. 
> This makes AccessibleJSlider consistent with the AccessibleJSpinner class. It 
> is more clear and the logic to increase/decrease Slider value can be changed 
> easily. But this changes AccessibleJSlider class and will need a CSR.
> 2. Get the current Accessible Value from the component and  just 
> increment/decrement it in SliderAccessibility.m  class itself and then set 
> the current accessible value fro there only. This will not need any changes 
> in AccessibleJSlider class, but this does not look correct way and I have not 
> used this.
> 
> The changes can be easily tested by using a JSlider example, like the 
> following example. VO should announce the correct the slider values. To 
> change the slider values, use ctrl+opt+shift+down key to start interacting 
> with the slider, then use ctrl+opt+up/down arrow keys to increment/decrement 
> slider values.
> 
>       import javax.swing.JFrame;
>       import javax.swing.JSlider;
>       
>       public class JSliderDemo{
>           public static void main(String[] args) throws Exception {
>               JFrame jframe = new JFrame("JSlider Demo");
>               jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
>               jframe.add(new JSlider());
>       
>               jframe.setLocationRelativeTo(null);
>               jframe.pack();
>               jframe.setVisible(true);
>           }
>       }

Pankaj Bansal has updated the pull request with a new target base due to a 
merge or a rebase. The pull request now contains seven commits:

 - Merge branch 'master' into JDK-8262981
 - increase initial capacity for rolesMap
 - Remove whitespaces
 - remove SpinboxAccessibility.m changes
 - Code cleanup
 - cleanup
 - 8262981: Create implementation for NSAccessibilitySlider protocol

-------------

Changes: https://git.openjdk.java.net/jdk/pull/2874/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2874&range=02
  Stats: 75 lines in 4 files changed: 68 ins; 1 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2874.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2874/head:pull/2874

PR: https://git.openjdk.java.net/jdk/pull/2874

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