Create LoadingBar component

Create loading bar component to indicate when page data
is 'loading'. Not every component view will need to show the
loading bar (eg Reboot BMC).
The LoadingBarMixin can be imported per component as needed.

Signed-off-by: Yoshie Muranaka <yoshiemuranaka@gmail.com>
Change-Id: I6735be37bc0a81f5bb2b7c93fb31a0e0ef9b40d1

4 files changed, 112 insertions, 1 deletions

diff --git a/src/components/AppHeader/AppHeader.vue b/src/components/AppHeader/AppHeader.vue
index 114d6c9dd..d937293da 100644
--- a/src/components/AppHeader/AppHeader.vue
+++ b/src/components/AppHeader/AppHeader.vue
@@ -52,6 +52,7 @@
         </b-navbar-nav>
       </b-navbar>
     </header>
+    <loading-bar />
   </div>
 </template>
 
@@ -61,10 +62,18 @@ import IconClose from '@carbon/icons-vue/es/close/20';
 import IconMenu from '@carbon/icons-vue/es/menu/20';
 import IconRenew from '@carbon/icons-vue/es/renew/20';
 import StatusIcon from '../Global/StatusIcon';
+import LoadingBar from '../Global/LoadingBar';
 
 export default {
   name: 'AppHeader',
-  components: { IconAvatar, IconClose, IconMenu, IconRenew, StatusIcon },
+  components: {
+    IconAvatar,
+    IconClose,
+    IconMenu,
+    IconRenew,
+    StatusIcon,
+    LoadingBar
+  },
   data() {
     return {
       isNavigationOpen: false
diff --git a/src/components/Global/LoadingBar.vue b/src/components/Global/LoadingBar.vue
new file mode 100644
index 000000000..1d8d68a82
--- /dev/null
+++ b/src/components/Global/LoadingBar.vue
@@ -0,0 +1,85 @@
+<template>
+  <transition name="fade">
+    <b-progress
+      v-if="!isLoadingComplete"
+      :value="loadingIndicatorValue"
+      height="0.4rem"
+    />
+  </transition>
+</template>
+
+<script>
+export default {
+  data() {
+    return {
+      loadingIndicatorValue: 0,
+      isLoadingComplete: false,
+      loadingIntervalId: null,
+      timeoutId: null
+    };
+  },
+  created() {
+    this.$root.$on('loader::start', () => {
+      this.startLoadingInterval();
+    });
+    this.$root.$on('loader::end', () => {
+      this.endLoadingInterval();
+    });
+    this.$root.$on('loader::hide', () => {
+      this.hideLoadingBar();
+    });
+  },
+  methods: {
+    startLoadingInterval() {
+      this.clearLoadingInterval();
+      this.clearTimeout();
+      this.loadingIndicatorValue = 0;
+      this.isLoadingComplete = false;
+      this.loadingIntervalId = setInterval(() => {
+        this.loadingIndicatorValue += 1;
+        if (this.loadingIndicatorValue > 100) this.clearLoadingInterval();
+      }, 100);
+    },
+    endLoadingInterval() {
+      this.clearLoadingInterval();
+      this.clearTimeout();
+      this.loadingIndicatorValue = 100;
+      this.timeoutId = setTimeout(() => {
+        // Let animation complete before hiding
+        // the loading bar
+        this.isLoadingComplete = true;
+      }, 1000);
+    },
+    hideLoadingBar() {
+      this.clearLoadingInterval();
+      this.clearTimeout();
+      this.loadingIndicatorValue = 0;
+      this.isLoadingComplete = true;
+    },
+    clearLoadingInterval() {
+      if (this.loadingIntervalId) clearInterval(this.loadingIntervalId);
+      this.loadingIntervalId = null;
+    },
+    clearTimeout() {
+      if (this.timeoutId) clearTimeout(this.timeoutId);
+      this.timeoutId = null;
+    }
+  }
+};
+</script>
+
+<style lang="scss" scoped>
+.progress {
+  position: absolute;
+  left: 0;
+  right: 0;
+  bottom: -0.4rem;
+  opacity: 1;
+  transition: opacity $duration--moderate-01 $standard-easing--productive;
+
+  &.fade-enter,
+  &.fade-leave-to {
+    opacity: 0;
+  }
+}
+</style>
diff --git a/src/components/Mixins/LoadingBarMixin.js b/src/components/Mixins/LoadingBarMixin.js
new file mode 100644
index 000000000..111b40dc6
--- /dev/null
+++ b/src/components/Mixins/LoadingBarMixin.js
@@ -0,0 +1,15 @@
+const LoadingBarMixin = {
+  methods: {
+    startLoader() {
+      this.$root.$emit('loader::start');
+    },
+    endLoader() {
+      this.$root.$emit('loader::end');
+    },
+    hideLoader() {
+      this.$root.$emit('loader::hide');
+    }
+  }
+};
+
+export default LoadingBarMixin;
diff --git a/src/main.js b/src/main.js
index b59afd9aa..d9f1e7876 100644
--- a/src/main.js
+++ b/src/main.js
@@ -24,6 +24,7 @@ import {
   ModalPlugin,
   NavbarPlugin,
   NavPlugin,
+  ProgressPlugin,
   TablePlugin,
   ToastPlugin,
   TooltipPlugin
@@ -91,6 +92,7 @@ Vue.use(ListGroupPlugin);
 Vue.use(ModalPlugin);
 Vue.use(NavbarPlugin);
 Vue.use(NavPlugin);
+Vue.use(ProgressPlugin);
 Vue.use(TablePlugin);
 Vue.use(ToastPlugin);
 Vue.use(TooltipPlugin);