1 files changed, 343 insertions, 0 deletions
diff --git a/node_modules/vue/src/platforms/web/runtime/modules/transition.js b/node_modules/vue/src/platforms/web/runtime/modules/transition.js
new file mode 100644
index 00000000..0796b5da
--- /dev/null
+++ b/node_modules/vue/src/platforms/web/runtime/modules/transition.js
@@ -0,0 +1,343 @@
+/* @flow */
+
+import { inBrowser, isIE9, warn } from 'core/util/index'
+import { mergeVNodeHook } from 'core/vdom/helpers/index'
+import { activeInstance } from 'core/instance/lifecycle'
+
+import {
+  once,
+  isDef,
+  isUndef,
+  isObject,
+  toNumber
+} from 'shared/util'
+
+import {
+  nextFrame,
+  resolveTransition,
+  whenTransitionEnds,
+  addTransitionClass,
+  removeTransitionClass
+} from '../transition-util'
+
+export function enter (vnode: VNodeWithData, toggleDisplay: ?() => void) {
+  const el: any = vnode.elm
+
+  // call leave callback now
+  if (isDef(el._leaveCb)) {
+    el._leaveCb.cancelled = true
+    el._leaveCb()
+  }
+
+  const data = resolveTransition(vnode.data.transition)
+  if (isUndef(data)) {
+    return
+  }
+
+  /* istanbul ignore if */
+  if (isDef(el._enterCb) || el.nodeType !== 1) {
+    return
+  }
+
+  const {
+    css,
+    type,
+    enterClass,
+    enterToClass,
+    enterActiveClass,
+    appearClass,
+    appearToClass,
+    appearActiveClass,
+    beforeEnter,
+    enter,
+    afterEnter,
+    enterCancelled,
+    beforeAppear,
+    appear,
+    afterAppear,
+    appearCancelled,
+    duration
+  } = data
+
+  // activeInstance will always be the <transition> component managing this
+  // transition. One edge case to check is when the <transition> is placed
+  // as the root node of a child component. In that case we need to check
+  // <transition>'s parent for appear check.
+  let context = activeInstance
+  let transitionNode = activeInstance.$vnode
+  while (transitionNode && transitionNode.parent) {
+    transitionNode = transitionNode.parent
+    context = transitionNode.context
+  }
+
+  const isAppear = !context._isMounted || !vnode.isRootInsert
+
+  if (isAppear && !appear && appear !== '') {
+    return
+  }
+
+  const startClass = isAppear && appearClass
+    ? appearClass
+    : enterClass
+  const activeClass = isAppear && appearActiveClass
+    ? appearActiveClass
+    : enterActiveClass
+  const toClass = isAppear && appearToClass
+    ? appearToClass
+    : enterToClass
+
+  const beforeEnterHook = isAppear
+    ? (beforeAppear || beforeEnter)
+    : beforeEnter
+  const enterHook = isAppear
+    ? (typeof appear === 'function' ? appear : enter)
+    : enter
+  const afterEnterHook = isAppear
+    ? (afterAppear || afterEnter)
+    : afterEnter
+  const enterCancelledHook = isAppear
+    ? (appearCancelled || enterCancelled)
+    : enterCancelled
+
+  const explicitEnterDuration: any = toNumber(
+    isObject(duration)
+      ? duration.enter
+      : duration
+  )
+
+  if (process.env.NODE_ENV !== 'production' && explicitEnterDuration != null) {
+    checkDuration(explicitEnterDuration, 'enter', vnode)
+  }
+
+  const expectsCSS = css !== false && !isIE9
+  const userWantsControl = getHookArgumentsLength(enterHook)
+
+  const cb = el._enterCb = once(() => {
+    if (expectsCSS) {
+      removeTransitionClass(el, toClass)
+      removeTransitionClass(el, activeClass)
+    }
+    if (cb.cancelled) {
+      if (expectsCSS) {
+        removeTransitionClass(el, startClass)
+      }
+      enterCancelledHook && enterCancelledHook(el)
+    } else {
+      afterEnterHook && afterEnterHook(el)
+    }
+    el._enterCb = null
+  })
+
+  if (!vnode.data.show) {
+    // remove pending leave element on enter by injecting an insert hook
+    mergeVNodeHook(vnode, 'insert', () => {
+      const parent = el.parentNode
+      const pendingNode = parent && parent._pending && parent._pending[vnode.key]
+      if (pendingNode &&
+        pendingNode.tag === vnode.tag &&
+        pendingNode.elm._leaveCb
+      ) {
+        pendingNode.elm._leaveCb()
+      }
+      enterHook && enterHook(el, cb)
+    })
+  }
+
+  // start enter transition
+  beforeEnterHook && beforeEnterHook(el)
+  if (expectsCSS) {
+    addTransitionClass(el, startClass)
+    addTransitionClass(el, activeClass)
+    nextFrame(() => {
+      removeTransitionClass(el, startClass)
+      if (!cb.cancelled) {
+        addTransitionClass(el, toClass)
+        if (!userWantsControl) {
+          if (isValidDuration(explicitEnterDuration)) {
+            setTimeout(cb, explicitEnterDuration)
+          } else {
+            whenTransitionEnds(el, type, cb)
+          }
+        }
+      }
+    })
+  }
+
+  if (vnode.data.show) {
+    toggleDisplay && toggleDisplay()
+    enterHook && enterHook(el, cb)
+  }
+
+  if (!expectsCSS && !userWantsControl) {
+    cb()
+  }
+}
+
+export function leave (vnode: VNodeWithData, rm: Function) {
+  const el: any = vnode.elm
+
+  // call enter callback now
+  if (isDef(el._enterCb)) {
+    el._enterCb.cancelled = true
+    el._enterCb()
+  }
+
+  const data = resolveTransition(vnode.data.transition)
+  if (isUndef(data) || el.nodeType !== 1) {
+    return rm()
+  }
+
+  /* istanbul ignore if */
+  if (isDef(el._leaveCb)) {
+    return
+  }
+
+  const {
+    css,
+    type,
+    leaveClass,
+    leaveToClass,
+    leaveActiveClass,
+    beforeLeave,
+    leave,
+    afterLeave,
+    leaveCancelled,
+    delayLeave,
+    duration
+  } = data
+
+  const expectsCSS = css !== false && !isIE9
+  const userWantsControl = getHookArgumentsLength(leave)
+
+  const explicitLeaveDuration: any = toNumber(
+    isObject(duration)
+      ? duration.leave
+      : duration
+  )
+
+  if (process.env.NODE_ENV !== 'production' && isDef(explicitLeaveDuration)) {
+    checkDuration(explicitLeaveDuration, 'leave', vnode)
+  }
+
+  const cb = el._leaveCb = once(() => {
+    if (el.parentNode && el.parentNode._pending) {
+      el.parentNode._pending[vnode.key] = null
+    }
+    if (expectsCSS) {
+      removeTransitionClass(el, leaveToClass)
+      removeTransitionClass(el, leaveActiveClass)
+    }
+    if (cb.cancelled) {
+      if (expectsCSS) {
+        removeTransitionClass(el, leaveClass)
+      }
+      leaveCancelled && leaveCancelled(el)
+    } else {
+      rm()
+      afterLeave && afterLeave(el)
+    }
+    el._leaveCb = null
+  })
+
+  if (delayLeave) {
+    delayLeave(performLeave)
+  } else {
+    performLeave()
+  }
+
+  function performLeave () {
+    // the delayed leave may have already been cancelled
+    if (cb.cancelled) {
+      return
+    }
+    // record leaving element
+    if (!vnode.data.show) {
+      (el.parentNode._pending || (el.parentNode._pending = {}))[(vnode.key: any)] = vnode
+    }
+    beforeLeave && beforeLeave(el)
+    if (expectsCSS) {
+      addTransitionClass(el, leaveClass)
+      addTransitionClass(el, leaveActiveClass)
+      nextFrame(() => {
+        removeTransitionClass(el, leaveClass)
+        if (!cb.cancelled) {
+          addTransitionClass(el, leaveToClass)
+          if (!userWantsControl) {
+            if (isValidDuration(explicitLeaveDuration)) {
+              setTimeout(cb, explicitLeaveDuration)
+            } else {
+              whenTransitionEnds(el, type, cb)
+            }
+          }
+        }
+      })
+    }
+    leave && leave(el, cb)
+    if (!expectsCSS && !userWantsControl) {
+      cb()
+    }
+  }
+}
+
+// only used in dev mode
+function checkDuration (val, name, vnode) {
+  if (typeof val !== 'number') {
+    warn(
+      `<transition> explicit ${name} duration is not a valid number - ` +
+      `got ${JSON.stringify(val)}.`,
+      vnode.context
+    )
+  } else if (isNaN(val)) {
+    warn(
+      `<transition> explicit ${name} duration is NaN - ` +
+      'the duration expression might be incorrect.',
+      vnode.context
+    )
+  }
+}
+
+function isValidDuration (val) {
+  return typeof val === 'number' && !isNaN(val)
+}
+
+/**
+ * Normalize a transition hook's argument length. The hook may be:
+ * - a merged hook (invoker) with the original in .fns
+ * - a wrapped component method (check ._length)
+ * - a plain function (.length)
+ */
+function getHookArgumentsLength (fn: Function): boolean {
+  if (isUndef(fn)) {
+    return false
+  }
+  const invokerFns = fn.fns
+  if (isDef(invokerFns)) {
+    // invoker
+    return getHookArgumentsLength(
+      Array.isArray(invokerFns)
+        ? invokerFns[0]
+        : invokerFns
+    )
+  } else {
+    return (fn._length || fn.length) > 1
+  }
+}
+
+function _enter (_: any, vnode: VNodeWithData) {
+  if (vnode.data.show !== true) {
+    enter(vnode)
+  }
+}
+
+export default inBrowser ? {
+  create: _enter,
+  activate: _enter,
+  remove (vnode: VNode, rm: Function) {
+    /* istanbul ignore else */
+    if (vnode.data.show !== true) {
+      leave(vnode, rm)
+    } else {
+      rm()
+    }
+  }
+} : {}