bootstrap-vue · jacobmllr95 · Feb 13, 2020 · Feb 13, 2020 · Feb 13, 2020 · Feb 13, 2020
diff --git a/src/utils/bv-hover-swap.js b/src/utils/bv-hover-swap.js
@@ -0,0 +1,66 @@
+import Vue from './vue'
+import { eventOn, eventOff } from './dom'
+
+// --- Constants ---
+
+const EVENT_OPTIONS = { passive: true }
+
+// @vue/component
+export const BVHoverSwap = /*#__PURE__*/ Vue.extend({
+  name: 'BVHoverSwap',
+  props: {
+    tag: {
+      type: String,
+      default: 'div'
+    },
+    parent: {
+      type: Boolean,
+      default: false
+    }
+  },
+  data() {
+    return {
+      isHovered: false
+    }
+  },
+  watch: {
+    parent() {
+      this.listen(true)
+    }
+  },
+  created() {
+    // Create non-reactive property
+    this.$_hoverEl = null
+  },
+  mounted() {
+    this.$nextTick(() => this.listen(true))
+  },
+  updated() /* istanbul ignore next */ {
+    this.$nextTick(() => this.listen(true))
+  },
+  beforeDestroy() {
+    this.listen(false)
+    this.$_hoverEl = null
+  },
+  methods: {
+    listen(on) {
+      const el = this.parent ? this.$el.parentElement || this.$el : this.$el
+      if (on && this.$_hoverEl !== el) {
+        this.listen(false)
+        this.$_hoverEl = el
+      }
+      const method = on ? eventOn : eventOff
+      method(this.$_hoverEl, 'mouseenter', this.handleHover, EVENT_OPTIONS)
+      method(this.$_hoverEl, 'mouseleave', this.handleHover, EVENT_OPTIONS)
+    },
+    handleHover(evt) {
+      this.isHovered = evt.type === 'mouseenter'
+    }
+  },
+  render(h) {
+    const $scoped = this.$scopedSlots
+    const $default = $scoped.default || (() => h())
+    const $hovered = $scoped.hovered || $default
+    return h(this.tag, [this.isHovered ? $hovered() : $default()])
+  }
+})
diff --git a/src/utils/bv-hover-swap.spec.js b/src/utils/bv-hover-swap.spec.js
@@ -0,0 +1,99 @@
+import { mount } from '@vue/test-utils'
+import { waitNT } from '../../tests/utils'
+import { BVHoverSwap } from './bv-hover-swap'
+
+describe('utils/bv-hoverswap', () => {
+  it('works', async () => {
+    const wrapper = mount(BVHoverSwap, {
+      slots: {
+        default: '<span>FOO</span>',
+        hovered: '<span>BAR</span>'
+      }
+    })
+
+    expect(wrapper.isVueInstance()).toBe(true)
+    await waitNT(wrapper.vm)
+    expect(wrapper.is('div')).toBe(true)
+    expect(wrapper.text()).toBe('FOO')
+
+    wrapper.trigger('mouseenter')
+    await waitNT(wrapper.vm)
+
+    expect(wrapper.is('div')).toBe(true)
+    expect(wrapper.text()).toBe('BAR')
+
+    wrapper.trigger('mouseleave')
+    await waitNT(wrapper.vm)
+
+    expect(wrapper.is('div')).toBe(true)
+    expect(wrapper.text()).toBe('FOO')
+
+    wrapper.destroy()
+  })
+
+  it('works when `parent` is true ', async () => {
+    const app = {
+      props: {
+        parent: {
+          type: Boolean,
+          defaut: false
+        }
+      },
+      methods: {
+        foo() {
+          return this.$createElement('span', {}, 'FOO')
+        },
+        bar() {
+          return this.$createElement('span', {}, 'BAR')
+        }
+      },
+      render(h) {
+        const $content = h(BVHoverSwap, {
+          props: { parent: this.parent },
+          scopedSlots: { default: this.foo, hovered: this.bar }
+        })
+        return h('div', {}, [$content])
+      }
+    }
+    const wrapper = mount(app, {
+      propsData: {
+        parent: true
+      }
+    })
+
+    expect(wrapper.isVueInstance()).toBe(true)
+    await waitNT(wrapper.vm)
+    expect(wrapper.is('div')).toBe(true)
+    expect(wrapper.find('div > div').exists()).toBe(true)
+    expect(wrapper.find('div > div').is(BVHoverSwap)).toBe(true)
+    expect(wrapper.text()).toBe('FOO')
+
+    wrapper.trigger('mouseenter')
+    await waitNT(wrapper.vm)
+
+    expect(wrapper.is('div')).toBe(true)
+    expect(wrapper.text()).toBe('BAR')
+
+    wrapper.trigger('mouseleave')
+    await waitNT(wrapper.vm)
+
+    expect(wrapper.text()).toBe('FOO')
+
+    wrapper.setProps({
+      parent: false
+    })
+    await waitNT(wrapper.vm)
+
+    wrapper.trigger('mouseenter')
+    await waitNT(wrapper.vm)
+
+    expect(wrapper.text()).toBe('FOO')
+
+    wrapper.find('div > div').trigger('mouseenter')
+    await waitNT(wrapper.vm)
+
+    expect(wrapper.text()).toBe('BAR')
+
+    wrapper.destroy()
+  })
+})
diff --git a/src/utils/bv-transition.js b/src/utils/bv-transition.js
@@ -24,6 +24,7 @@ const FADE_PROPS = {
   leaveActiveClass: 'fade'
 }
 
+// @vue/component
 export const BVTransition = /*#__PURE__*/ Vue.extend({
   name: 'BVTransition',
   functional: true,