feat(vue): support ion-vue-router (#17821)

vue/src/components/ion-vue-router.ts

@@ -0,0 +1,149 @@
+import Vue, { CreateElement, RenderContext, VNodeData } from 'vue';
+
+type TransitionDone = () => void;
+interface Props {
+  name: string;
+  animated: boolean;
+}
+
+// Component entering the view
+let enteringEl: HTMLElement;
+
+export default {
+  name: 'IonVueRouter',
+  functional: true,
+
+  props: {
+    // Router view name
+    name: { default: 'default', type: String },
+    // Disable transitions
+    animated: { default: true, type: Boolean },
+  },
+
+  render(h: CreateElement, { parent, props, data, children }: RenderContext) {
+    if (!parent.$router) {
+      throw new Error('IonTabs requires an instance of either VueRouter or IonicVueRouter');
+    }
+
+    const ionRouterOutletData: VNodeData = {
+      ...data,
+      ref: 'ionRouterOutlet',
+      on: { click: (event: Event) => catchIonicGoBack(parent, event) },
+    };
+    const routerViewData: VNodeData = { props: { name: props.name } };
+    const transitionData: VNodeData = {
+      props: { css: false, mode: 'in-out' },
+      on: {
+        leave: (el: HTMLElement, done: TransitionDone) => {
+          leave(parent, props as Props, el, done);
+        },
+        beforeEnter,
+        enter,
+        afterEnter,
+        beforeLeave,
+        afterLeave,
+        enterCancelled,
+        leaveCancelled,
+      }
+    };
+
+    return h('ion-router-outlet', ionRouterOutletData, [
+      h('transition', transitionData, [
+        h('router-view', routerViewData, children)
+      ])
+    ]);
+  }
+};
+
+function catchIonicGoBack(parent: Vue, event: Event): void {
+  if (!event.target) return;
+
+  // We only care for the event coming from Ionic's back button
+  const backButton = (event.target as HTMLElement).closest('ion-back-button') as HTMLIonBackButtonElement;
+  if (!backButton) return;
+
+  const $router = parent.$router;
+  let defaultHref: string;
+
+  // Explicitly override router direction to always trigger a back transition
+  $router.directionOverride = -1;
+
+  // If we can go back - do so
+  if ($router.canGoBack()) {
+    event.preventDefault();
+    $router.back();
+    return;
+  }
+
+  // If there's a default fallback - use it
+  defaultHref = backButton.defaultHref as string;
+  if (undefined !== defaultHref) {
+    event.preventDefault();
+    $router.push(defaultHref);
+  }
+}
+
+// Transition when we leave the route
+function leave(parent: Vue, props: Props, el: HTMLElement, done: TransitionDone) {
+  const promise = transition(parent, props, el);
+
+  // Skip any transition if we don't get back a Promise
+  if (!promise) {
+    done();
+    return;
+  }
+
+  // Perform navigation once the transition was finished
+  parent.$router.transition = new Promise(resolve => {
+    promise.then(() => {
+      resolve();
+      done();
+    }).catch(console.error);
+  });
+}
+
+// Trigger the ionic/core transitions
+function transition(parent: Vue, props: Props, leavingEl: HTMLElement) {
+  const ionRouterOutlet = parent.$refs.ionRouterOutlet as HTMLIonRouterOutletElement;
+
+  // The Ionic framework didn't load - skip animations
+  if (typeof ionRouterOutlet.componentOnReady === 'undefined') {
+    return;
+  }
+
+  // Skip animations if there's no component to navigate to
+  // or the current and the "to-be-rendered" components are the same
+  if (!enteringEl || enteringEl === leavingEl) {
+    return;
+  }
+
+  // Add the proper Ionic classes, important for smooth transitions
+  enteringEl.classList.add('ion-page', 'ion-page-invisible');
+
+  // Commit to the transition as soon as the Ionic Router Outlet is ready
+  return ionRouterOutlet.componentOnReady().then((el: HTMLIonRouterOutletElement) => {
+    return el.commit(enteringEl, leavingEl, {
+      deepWait: true,
+      duration: !props.animated ? 0 : undefined,
+      direction: parent.$router.direction === 1 ? 'forward' : 'back',
+      showGoBack: parent.$router.canGoBack(),
+    });
+  }).catch(console.error);
+}
+
+// Set the component to be rendered before we render the new route
+function beforeEnter(el: HTMLElement) {
+  enteringEl = el;
+}
+
+// Enter the new route
+function enter(_el: HTMLElement, done: TransitionDone) {
+  done();
+}
+
+// Vue transition stub functions
+function afterEnter(_el: HTMLElement) { /* */ }
+function afterLeave(_el: HTMLElement) { /* */ }
+function beforeLeave(_el: HTMLElement) { /* */ }
+function enterCancelled(_el: HTMLElement) { /* */ }
+function leaveCancelled(_el: HTMLElement) { /* */ }