Fixed taphandler problems.

lib/flippable.js

@@ -2,6 +2,7 @@
 /* global PDFJS Power1 */
 import { getId } from './utils.js'
 import { DOMScatter } from './scatter.js'
+import CardWrapper from './card/wrapper.js'
 
 export class CardLoader {
     constructor(
@@ -403,20 +404,23 @@ export class DOMFlippable {
         this.backBtn = element.querySelector('.backBtn')
         this.closeBtn = element.querySelector('.closeBtn')
         /* Buttons are not guaranteed to exist. */
-
+        if (scatter.tapDelegate == null) {
+            let tapDelegate = new CardWrapper(element)
+            scatter.tapDelegate = tapDelegate
+        }
         if (this.infoBtn) {
-            scatter.addTapListener(this.infoBtn, event => {
+            scatter.tapDelegate.onTap(this.infoBtn, event => {
                 this.flip.start()
             })
             this.enable(this.infoBtn)
         }
         if (this.backBtn) {
-            scatter.addTapListener(this.backBtn, event => {
+            scatter.tapDelegate.onTap(this.backBtn, event => {
                 this.start()
             })
         }
         if (this.closeBtn) {
-            scatter.addTapListener(this.closeBtn, event => {
+            scatter.tapDelegate.onTap(this.closeBtn, event => {
                 this.close()
             })
             this.enable(this.closeBtn)