From d970108d168a4b8fb1c44d7eee4edad84579da17 Mon Sep 17 00:00:00 2001
From: JeremyWuuuuu <15975785+JeremyWuuuuu@users.noreply.github.com>
Date: Sun, 4 Jul 2021 10:08:15 +0800
Subject: [PATCH] feat(hooks): add use-transition-fallthrough-hook

- Add transition-fallthrough-hook to get common logic extracted.
---
 .../hooks/use-transition-fallthrough/index.ts | 97 +++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 packages/hooks/use-transition-fallthrough/index.ts

diff --git a/packages/hooks/use-transition-fallthrough/index.ts b/packages/hooks/use-transition-fallthrough/index.ts
new file mode 100644
index 0000000000..f431ba3c27
--- /dev/null
+++ b/packages/hooks/use-transition-fallthrough/index.ts
@@ -0,0 +1,97 @@
+/* istanbul ignore file */
+import { getCurrentInstance } from 'vue'
+
+const AFTER_APPEAR = 'after-appear'
+const AFTER_ENTER = 'after-enter'
+const AFTER_LEAVE = 'after-leave'
+const APPEAR = 'appear'
+const APPEAR_CANCELLED = 'appear-cancelled'
+const BEFORE_ENTER = 'before-enter'
+const BEFORE_LEAVE = 'before-leave'
+const ENTER = 'enter'
+const ENTER_CANCELLED = 'enter-cancelled'
+const LEAVE = 'leave'
+const LEAVE_CANCELLED = 'leave-cancelled'
+
+export const useTransitionFallthroughEmits = [
+  AFTER_APPEAR,
+  AFTER_ENTER,
+  AFTER_LEAVE,
+  APPEAR,
+  APPEAR_CANCELLED,
+  BEFORE_ENTER,
+  BEFORE_LEAVE,
+  ENTER,
+  ENTER_CANCELLED,
+  LEAVE,
+  LEAVE_CANCELLED,
+]
+
+// Sometimes we want to delegate the transition emitted event
+// we have to right the function locally, which is not a good
+// approach to this, so we created this hook for the event
+// fallthrough
+
+/**
+ * NOTE:
+ * This is only a delegator for delegating transition callbacks.
+ * Use this at your need.
+ */
+
+
+/**
+ * Simple usage
+ *
+ * In your setups:
+ *
+ * setup() {
+ *   const fallthroughMethods = useTransitionFallthrough()
+ *   return fallthrough
+ * }
+ *
+ * In your template:
+ *
+ * <template>
+ *  <transition name="whatever" v-bind="fallthrough">
+ *    <slot />
+ *  </transition>
+ * </template>
+ *
+ */
+
+export const useTransitionFallthrough = () => {
+  const { emit } = getCurrentInstance()
+
+  return {
+    onAfterAppear: () => {
+      emit(AFTER_APPEAR)
+    },
+    onAfterEnter: () => {
+      emit(AFTER_ENTER)
+    },
+    onAfterLeave: () => {
+      emit(AFTER_LEAVE)
+    },
+    onAppearCancelled: () => {
+      emit(APPEAR_CANCELLED)
+    },
+    onBeforeEnter: () => {
+      emit(BEFORE_ENTER)
+    },
+    onBeforeLeave: () => {
+      emit(BEFORE_LEAVE)
+    },
+    onEnter: () => {
+      emit(ENTER)
+    },
+    onEnterCancelled: () => {
+      emit(ENTER_CANCELLED)
+    },
+    onLeave: () => {
+      emit(LEAVE)
+    },
+    onLeaveCancelled: () => {
+      emit(LEAVE_CANCELLED)
+    },
+  }
+}