Added textAlpha and textActiveAlpha to Button and ButtonGroup.

doc/out/pixi_theme.js.html

@@ -1524,6 +1524,8 @@ export default class Theme {
      *     large text.
      * @param {object} [opts.textStyleLargeActive=textStyleLarge + {fill: primaryColor}] - A textstyle object which
      *     is used for large actived text.
+     * @param {number} [opts.textAlpha=Theme.textAlpha] - The alpha value of text.
+     * @param {number} [opts.textActiveAlpha=Theme.textActiveAlpha] - The alpha value of text when activated.
      */
     constructor(opts = {}) {
         const colorPrimary = opts.primaryColor != null ? opts.primaryColor : 0x5ec7f8 // blue
@@ -1552,6 +1554,8 @@ export default class Theme {
                 strokeActive: color2,
                 strokeActiveWidth: 0.6,
                 strokeActiveAlpha: 1,
+                textAlpha: 1,
+                textActiveAlpha: 1,
                 iconColor: color2,
                 iconColorActive: colorPrimary,
                 background: color1
@@ -1718,7 +1722,7 @@ export class ThemeRed extends Theme {
 
         <footer class="content-size">
             <div class="footer">
-                Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.6.3</a> on Fri Oct 11 2019 09:19:28 GMT+0200 (Mitteleuropäische Sommerzeit)
+                Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.6.3</a> on Tue Oct 15 2019 14:56:00 GMT+0200 (Mitteleuropäische Sommerzeit)
             </div>
         </footer>
     </div>