Merge branch 'resize-vuln-graph' into 'master'

Backport Resizable container component for gl-charts

See merge request gitlab-org/gitlab-ce!26843

app/assets/javascripts/contextual_sidebar.js

@@ -41,6 +41,9 @@ export default class ContextualSidebar {
         this.toggleCollapsedSidebar(value, true);
       }
     });
+    this.$page.on('transitionstart transitionend', () => {
+      $(document).trigger('content.resize');
+    });
 
     $(window).on('resize', () => _.debounce(this.render(), 100));
   }

app/assets/javascripts/vue_shared/components/resizable_chart/resizable_chart_container.vue

+<script>
+import { debounceByAnimationFrame } from '~/lib/utils/common_utils';
+import $ from 'jquery';
+
+export default {
+  data() {
+    return {
+      width: 0,
+      height: 0,
+    };
+  },
+  beforeDestroy() {
+    this.contentResizeHandler.off('content.resize', this.debouncedResize);
+    window.removeEventListener('resize', this.debouncedResize);
+  },
+  created() {
+    this.debouncedResize = debounceByAnimationFrame(this.onResize);
+
+    // Handle when we explicictly trigger a custom resize event
+    this.contentResizeHandler = $(document).on('content.resize', this.debouncedResize);
+
+    // Handle window resize
+    window.addEventListener('resize', this.debouncedResize);
+  },
+  methods: {
+    onResize() {
+      // Slot dimensions
+      const { clientWidth, clientHeight } = this.$refs.chartWrapper;
+      this.width = clientWidth;
+      this.height = clientHeight;
+    },
+  },
+};
+</script>
+
+<template>
+  <div ref="chartWrapper">
+    <slot :width="width" :height="height"> </slot>
+  </div>
+</template>

spec/frontend/vue_shared/components/__snapshots__/resizable_chart_container_spec.js.snap

+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Resizable Chart Container renders the component 1`] = `
+<div>
+  <div
+    class="slot"
+  >
+    <span
+      class="width"
+    >
+      0
+    </span>
+     
+    <span
+      class="height"
+    >
+      0
+    </span>
+  </div>
+</div>
+`;

spec/frontend/vue_shared/components/resizable_chart_container_spec.js

+import Vue from 'vue';
+import { mount } from '@vue/test-utils';
+import ResizableChartContainer from '~/vue_shared/components/resizable_chart/resizable_chart_container.vue';
+import $ from 'jquery';
+
+jest.mock('~/lib/utils/common_utils', () => ({
+  debounceByAnimationFrame(callback) {
+    return jest.spyOn({ callback }, 'callback');
+  },
+}));
+
+describe('Resizable Chart Container', () => {
+  let wrapper;
+
+  beforeEach(() => {
+    wrapper = mount(ResizableChartContainer, {
+      attachToDocument: true,
+      scopedSlots: {
+        default: `
+        <div class="slot" slot-scope="{ width, height }">
+          <span class="width">{{width}}</span>
+          <span class="height">{{height}}</span>
+        </div>
+        `,
+      },
+    });
+  });
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  it('renders the component', () => {
+    expect(wrapper.element).toMatchSnapshot();
+  });
+
+  it('updates the slot width and height props', () => {
+    const width = 1920;
+    const height = 1080;
+
+    // JSDOM mocks and sets clientWidth/clientHeight to 0 so we set manually
+    wrapper.vm.$refs.chartWrapper = { clientWidth: width, clientHeight: height };
+
+    $(document).trigger('content.resize');
+
+    return Vue.nextTick().then(() => {
+      const widthNode = wrapper.find('.slot > .width');
+      const heightNode = wrapper.find('.slot > .height');
+
+      expect(parseInt(widthNode.text(), 10)).toEqual(width);
+      expect(parseInt(heightNode.text(), 10)).toEqual(height);
+    });
+  });
+
+  it('calls onResize on manual resize', () => {
+    $(document).trigger('content.resize');
+    expect(wrapper.vm.debouncedResize).toHaveBeenCalled();
+  });
+
+  it('calls onResize on page resize', () => {
+    window.dispatchEvent(new Event('resize'));
+    expect(wrapper.vm.debouncedResize).toHaveBeenCalled();
+  });
+});