Add latest changes from gitlab-org/gitlab@master

1 files changed, 81 insertions, 0 deletions

diff --git a/app/assets/javascripts/vue_shared/components/dropdown_keyboard_navigation.vue b/app/assets/javascripts/vue_shared/components/dropdown_keyboard_navigation.vue
new file mode 100644
index 00000000000..5d0ed8b0821
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/dropdown_keyboard_navigation.vue
@@ -0,0 +1,81 @@
+<script>
+import { UP_KEY_CODE, DOWN_KEY_CODE, TAB_KEY_CODE } from '~/lib/utils/keycodes';
+
+export default {
+  model: {
+    prop: 'index',
+    event: 'change',
+  },
+  props: {
+    /* v-model property to manage location in list */
+    index: {
+      type: Number,
+      required: true,
+    },
+    /* Highest index that can be navigated to */
+    max: {
+      type: Number,
+      required: true,
+    },
+    /* Lowest index that can be navigated to */
+    min: {
+      type: Number,
+      required: true,
+    },
+    /* Which index to set v-model to on init */
+    defaultIndex: {
+      type: Number,
+      required: true,
+    },
+  },
+  watch: {
+    max() {
+      // If the max index (list length) changes, reset the index
+      this.$emit('change', this.defaultIndex);
+    },
+  },
+  created() {
+    this.$emit('change', this.defaultIndex);
+    document.addEventListener('keydown', this.handleKeydown);
+  },
+  beforeDestroy() {
+    document.removeEventListener('keydown', this.handleKeydown);
+  },
+  methods: {
+    handleKeydown(event) {
+      if (event.keyCode === DOWN_KEY_CODE) {
+        // Prevents moving scrollbar
+        event.preventDefault();
+        event.stopPropagation();
+        // Moves to next index
+        this.increment(1);
+      } else if (event.keyCode === UP_KEY_CODE) {
+        // Prevents moving scrollbar
+        event.preventDefault();
+        event.stopPropagation();
+        // Moves to previous index
+        this.increment(-1);
+      } else if (event.keyCode === TAB_KEY_CODE) {
+        this.$emit('tab');
+      }
+    },
+    increment(val) {
+      if (this.max === 0) {
+        return;
+      }
+
+      const nextIndex = Math.max(this.min, Math.min(this.index + val, this.max));
+
+      // Return if the index didn't change
+      if (nextIndex === this.index) {
+        return;
+      }
+
+      this.$emit('change', nextIndex);
+    },
+  },
+  render() {
+    return this.$slots.default;
+  },
+};
+</script>