Merge branch 'master' into 3d-world

src/components/InfiniteScroll.vue

@@ -0,0 +1,42 @@
+<template>
+  <div ref="scrollContainer">
+    <slot />
+    <div ref="sentinel" style="height: 1px"></div>
+  </div>
+</template>
+
+<script lang="ts">
+import { Component, Emit, Prop, Vue } from "vue-facing-decorator";
+
+@Component
+export default class InfiniteScroll extends Vue {
+  @Prop({ default: 100 })
+  readonly distance!: number;
+  private observer!: IntersectionObserver;
+
+  mounted() {
+    const options = {
+      root: this.$refs.scrollContainer as HTMLElement,
+      rootMargin: `0px 0px ${this.distance}px 0px`,
+      threshold: 1.0,
+    };
+    this.observer = new IntersectionObserver(this.handleIntersection, options);
+    this.observer.observe(this.$refs.sentinel as HTMLElement);
+  }
+
+  beforeUnmount() {
+    this.observer.disconnect();
+  }
+  @Emit("reached-bottom")
+  handleIntersection(entries: IntersectionObserverEntry[]) {
+    const entry = entries[0];
+    if (entry.isIntersecting) {
+      return true;
+    }
+    return false;
+  }
+}
+</script>
+
+<!-- Add "scoped" attribute to limit CSS to this component only -->
+<style scoped></style>