Tidy up Roving Tab Index helpers and create one for RovingAccessibleTooltipButton

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/accessibility/roving/RovingAccessibleButton.tsx

@@ -0,0 +1,34 @@
+/*
+ *
+ * Copyright 2019 Michael Telatynski <7t3chguy@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * /
+ */
+
+import React from "react";
+
+import AccessibleButton from "../../components/views/elements/AccessibleButton";
+import {useRovingTabIndex} from "../RovingTabIndex";
+import {Ref} from "./types";
+
+interface IProps extends Omit<React.ComponentProps<typeof AccessibleButton>, "onFocus" | "inputRef" | "tabIndex"> {
+    inputRef?: Ref;
+}
+
+// Wrapper to allow use of useRovingTabIndex for simple AccessibleButtons outside of React Functional Components.
+export const RovingAccessibleButton: React.FC<IProps> = ({inputRef, ...props}) => {
+    const [onFocus, isActive, ref] = useRovingTabIndex(inputRef);
+    return <AccessibleButton {...props} onFocus={onFocus} inputRef={ref} tabIndex={isActive ? 0 : -1} />;
+};
+