8262981: Create implementation for NSAccessibilitySlider protocol

Reviewed-by: kizune

src/java.desktop/macosx/native/libawt_lwawt/awt/a11y/CommonComponentAccessibility.m

@@ -48,7 +48,7 @@ static jobject sAccessibilityClass = NULL;
     /*
      * Here we should keep all the mapping between the accessibility roles and implementing classes
      */
-    rolesMap = [[NSMutableDictionary alloc] initWithCapacity:26];
+    rolesMap = [[NSMutableDictionary alloc] initWithCapacity:27];
 
     [rolesMap setObject:@"ButtonAccessibility" forKey:@"pushbutton"];
     [rolesMap setObject:@"ImageAccessibility" forKey:@"icon"];
@@ -58,6 +58,7 @@ static jobject sAccessibilityClass = NULL;
     [rolesMap setObject:@"StaticTextAccessibility" forKey:@"label"];
     [rolesMap setObject:@"RadiobuttonAccessibility" forKey:@"radiobutton"];
     [rolesMap setObject:@"CheckboxAccessibility" forKey:@"checkbox"];
+    [rolesMap setObject:@"SliderAccessibility" forKey:@"slider"];
 
     /*
      * All the components below should be ignored by the accessibility subsystem,

src/java.desktop/macosx/native/libawt_lwawt/awt/a11y/SliderAccessibility.h

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#import "JavaComponentAccessibility.h"
+#import "CommonComponentAccessibility.h"
+
+#import <AppKit/AppKit.h>
+
+@interface SliderAccessibility : CommonComponentAccessibility <NSAccessibilitySlider> {
+
+};
+
+- (nullable NSString *)accessibilityLabel;
+- (nullable id)accessibilityValue;
+- (BOOL)accessibilityPerformDecrement;
+- (BOOL)accessibilityPerformIncrement;
+@end

src/java.desktop/macosx/native/libawt_lwawt/awt/a11y/SliderAccessibility.m

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#import "SliderAccessibility.h"
+
+#define INCREMENT 0
+#define DECREMENT 1
+
+/*
+ * Implementation of the accessibility peer for the slider role
+ */
+@implementation SliderAccessibility
+- (nullable NSString *)accessibilityLabel
+{
+    return [self accessibilityTitleAttribute];
+}
+
+- (nullable id)accessibilityValue
+{
+    return [self accessibilityValueAttribute];
+}
+
+- (BOOL)accessibilityPerformIncrement
+{
+    return [self performAccessibleAction:INCREMENT];
+}
+
+- (BOOL)accessibilityPerformDecrement
+{
+    return [self performAccessibleAction:DECREMENT];
+}
+
+@end

src/java.desktop/share/classes/javax/swing/JSlider.java

@@ -42,6 +42,7 @@ import java.util.Enumeration;
 import java.util.Hashtable;
 
 import javax.accessibility.Accessible;
+import javax.accessibility.AccessibleAction;
 import javax.accessibility.AccessibleContext;
 import javax.accessibility.AccessibleRole;
 import javax.accessibility.AccessibleState;
@@ -1421,7 +1422,7 @@ public class JSlider extends JComponent implements SwingConstants, Accessible {
      */
     @SuppressWarnings("serial") // Same-version serialization only
     protected class AccessibleJSlider extends AccessibleJComponent
-    implements AccessibleValue, ChangeListener {
+    implements AccessibleValue, ChangeListener, AccessibleAction {
 
 
         private int oldModelValue;
@@ -1536,5 +1537,71 @@ public class JSlider extends JComponent implements SwingConstants, Accessible {
             BoundedRangeModel model = JSlider.this.getModel();
             return Integer.valueOf(model.getMaximum() - model.getExtent());
         }
+
+        /**
+         * Gets the AccessibleAction associated with this object that supports
+         * one or more actions.
+         *
+         * @return AccessibleAction if supported by object; else return null
+         * @see AccessibleAction
+         */
+        public AccessibleAction getAccessibleAction() {
+            return this;
+        }
+
+        /* ===== Begin AccessibleAction impl ===== */
+
+        /**
+         * Returns the number of accessible actions available in this object
+         * If there are more than one, the first one is considered the "default"
+         * action of the object.
+         *
+         * Two actions are supported: AccessibleAction.INCREMENT which
+         * increments the slider value and AccessibleAction.DECREMENT
+         * which decrements the slider value
+         *
+         * @return the zero-based number of Actions in this object
+         */
+        public int getAccessibleActionCount() {
+            return 2;
+        }
+
+        /**
+         * Returns a description of the specified action of the object.
+         *
+         * @param i zero-based index of the actions
+         * @return a String description of the action
+         * @see #getAccessibleActionCount
+         */
+        public String getAccessibleActionDescription(int i) {
+            if (i == 0) {
+                return AccessibleAction.INCREMENT;
+            } else if (i == 1) {
+                return AccessibleAction.DECREMENT;
+            }
+            return null;
+        }
+
+        /**
+         * Performs the specified Action on the object
+         *
+         * @param i zero-based index of actions. The first action
+         * (index 0) is AccessibleAction.INCREMENT and the second
+         * action (index 1) is AccessibleAction.DECREMENT.
+         * @return true.
+         * @see #getAccessibleActionCount
+         */
+        public boolean doAccessibleAction(int direction) {
+            if (direction < 0 || direction > 1) {
+                return false;
+            }
+            //0 is increment, 1 is decrrement
+            int delta = ((direction > 0) ? -1 : 1);
+            JSlider.this.setValue(oldModelValue + delta);
+            return true;
+        }
+
+        /* ===== End AccessibleAction impl ===== */
+
     } // AccessibleJSlider
 }