1 files changed, 85 insertions, 0 deletions
diff --git a/app/assets/javascripts/vue_shared/components/tooltip_on_truncate/tooltip_on_truncate.vue b/app/assets/javascripts/vue_shared/components/tooltip_on_truncate/tooltip_on_truncate.vue
new file mode 100644
index 00000000000..09414e679bb
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/tooltip_on_truncate/tooltip_on_truncate.vue
@@ -0,0 +1,85 @@
+<script>
+import { GlTooltipDirective, GlResizeObserverDirective } from '@gitlab/ui';
+import { isFunction, debounce } from 'lodash';
+import { hasHorizontalOverflow } from '~/lib/utils/dom_utils';
+
+const UPDATE_TOOLTIP_DEBOUNCED_WAIT_MS = 300;
+
+export default {
+  directives: {
+    GlTooltip: GlTooltipDirective,
+    GlResizeObserver: GlResizeObserverDirective,
+  },
+  props: {
+    title: {
+      type: String,
+      required: false,
+      default: '',
+    },
+    placement: {
+      type: String,
+      required: false,
+      default: 'top',
+    },
+    truncateTarget: {
+      type: [String, Function],
+      required: false,
+      default: '',
+    },
+  },
+  data() {
+    return {
+      tooltipDisabled: true,
+    };
+  },
+  computed: {
+    classes() {
+      if (this.tooltipDisabled) {
+        return '';
+      }
+      return 'js-show-tooltip';
+    },
+    tooltip() {
+      return {
+        title: this.title,
+        placement: this.placement,
+        disabled: this.tooltipDisabled,
+      };
+    },
+  },
+  watch: {
+    title() {
+      // Wait on $nextTick in case the slot width changes
+      this.$nextTick(this.updateTooltip);
+    },
+  },
+  created() {
+    this.updateTooltipDebounced = debounce(this.updateTooltip, UPDATE_TOOLTIP_DEBOUNCED_WAIT_MS);
+  },
+  mounted() {
+    this.updateTooltip();
+  },
+  methods: {
+    selectTarget() {
+      if (isFunction(this.truncateTarget)) {
+        return this.truncateTarget(this.$el);
+      } else if (this.truncateTarget === 'child') {
+        return this.$el.childNodes[0];
+      }
+      return this.$el;
+    },
+    updateTooltip() {
+      this.tooltipDisabled = !hasHorizontalOverflow(this.selectTarget());
+    },
+    onResize() {
+      this.updateTooltipDebounced();
+    },
+  },
+};
+</script>
+
+<template>
+  <span v-gl-tooltip="tooltip" v-gl-resize-observer="onResize" :class="classes" class="gl-min-w-0">
+    <slot></slot>
+  </span>
+</template>