Make last panel full width if panel number is odd

 - remove half-width class if panel is last and panel
number is odd

app/assets/javascripts/monitoring/components/dashboard.vue

@@ -316,6 +316,16 @@ export default {
       // As a fallback, switch to default time range instead
       this.selectedTimeRange = defaultTimeRange;
     },
+    isPanelHalfWidth(panelIndex, totalPanels) {
+      /**
+       * A single panel on a row should take the full width of its parent.
+       * All others should have half the width their parent.
+       */
+      const isNumberOfPanelsEven = totalPanels % 2 === 0;
+      const isLastPanel = panelIndex === totalPanels - 1;
+
+      return isNumberOfPanelsEven || !isLastPanel;
+    },
   },
   i18n: {
     goBackLabel: s__('Metrics|Go back (Esc)'),
@@ -391,8 +401,12 @@ export default {
             <div
               v-for="(graphData, graphIndex) in groupData.panels"
               :key="`dashboard-panel-${graphIndex}`"
-              class="col-12 col-lg-6 px-2 mb-2 draggable"
-              :class="{ 'draggable-enabled': isRearrangingPanels }"
+              data-testid="dashboard-panel-layout-wrapper"
+              class="col-12 px-2 mb-2 draggable"
+              :class="{
+                'draggable-enabled': isRearrangingPanels,
+                'col-lg-6': isPanelHalfWidth(graphIndex, groupData.panels.length),
+              }"
             >
               <div class="position-relative draggable-panel js-draggable-panel">
                 <div

changelogs/unreleased/astoicescu-fullWidthCharts.yml

+---
+title: Add full width to single charts in a row
+merge_request: 34999
+author:
+type: added

spec/frontend/monitoring/components/dashboard_spec.js

@@ -16,6 +16,7 @@ import DashboardsDropdown from '~/monitoring/components/dashboards_dropdown.vue'
 import EmptyState from '~/monitoring/components/empty_state.vue';
 import GroupEmptyState from '~/monitoring/components/group_empty_state.vue';
 import DashboardPanel from '~/monitoring/components/dashboard_panel.vue';
+import GraphGroup from '~/monitoring/components/graph_group.vue';
 import LinksSection from '~/monitoring/components/links_section.vue';
 import { createStore } from '~/monitoring/stores';
 import * as types from '~/monitoring/stores/mutation_types';
@@ -24,6 +25,7 @@ import {
   setupStoreWithDashboard,
   setMetricResult,
   setupStoreWithData,
+  setupStoreWithDataForPanelCount,
   setupStoreWithVariable,
   setupStoreWithLinks,
 } from '../store_utils';
@@ -157,6 +159,75 @@ describe('Dashboard', () => {
     });
   });
 
+  describe('panel containers layout', () => {
+    const findPanelLayoutWrapperAt = index => {
+      return wrapper
+        .find(GraphGroup)
+        .findAll('[data-testid="dashboard-panel-layout-wrapper"]')
+        .at(index);
+    };
+
+    beforeEach(() => {
+      createMountedWrapper({ hasMetrics: true });
+
+      return wrapper.vm.$nextTick();
+    });
+
+    describe('when the graph group has an even number of panels', () => {
+      it('2 panels - all panel wrappers take half width of their parent', () => {
+        setupStoreWithDataForPanelCount(store, 2);
+
+        wrapper.vm.$nextTick(() => {
+          expect(findPanelLayoutWrapperAt(0).classes('col-lg-6')).toBe(true);
+          expect(findPanelLayoutWrapperAt(1).classes('col-lg-6')).toBe(true);
+        });
+      });
+
+      it('4 panels - all panel wrappers take half width of their parent', () => {
+        setupStoreWithDataForPanelCount(store, 4);
+
+        wrapper.vm.$nextTick(() => {
+          expect(findPanelLayoutWrapperAt(0).classes('col-lg-6')).toBe(true);
+          expect(findPanelLayoutWrapperAt(1).classes('col-lg-6')).toBe(true);
+          expect(findPanelLayoutWrapperAt(2).classes('col-lg-6')).toBe(true);
+          expect(findPanelLayoutWrapperAt(3).classes('col-lg-6')).toBe(true);
+        });
+      });
+    });
+
+    describe('when the graph group has an odd number of panels', () => {
+      it('1 panel - panel wrapper does not take half width of its parent', () => {
+        setupStoreWithDataForPanelCount(store, 1);
+
+        wrapper.vm.$nextTick(() => {
+          expect(findPanelLayoutWrapperAt(0).classes('col-lg-6')).toBe(false);
+        });
+      });
+
+      it('3 panels - all panels but last take half width of their parents', () => {
+        setupStoreWithDataForPanelCount(store, 3);
+
+        wrapper.vm.$nextTick(() => {
+          expect(findPanelLayoutWrapperAt(0).classes('col-lg-6')).toBe(true);
+          expect(findPanelLayoutWrapperAt(1).classes('col-lg-6')).toBe(true);
+          expect(findPanelLayoutWrapperAt(2).classes('col-lg-6')).toBe(false);
+        });
+      });
+
+      it('5 panels - all panels but last take half width of their parents', () => {
+        setupStoreWithDataForPanelCount(store, 5);
+
+        wrapper.vm.$nextTick(() => {
+          expect(findPanelLayoutWrapperAt(0).classes('col-lg-6')).toBe(true);
+          expect(findPanelLayoutWrapperAt(1).classes('col-lg-6')).toBe(true);
+          expect(findPanelLayoutWrapperAt(2).classes('col-lg-6')).toBe(true);
+          expect(findPanelLayoutWrapperAt(3).classes('col-lg-6')).toBe(true);
+          expect(findPanelLayoutWrapperAt(4).classes('col-lg-6')).toBe(false);
+        });
+      });
+    });
+  });
+
   describe('dashboard validation warning', () => {
     it('displays a warning if there are validation warnings', () => {
       createMountedWrapper({ hasMetrics: true });

spec/frontend/monitoring/store_utils.js

@@ -63,3 +63,24 @@ export const setupStoreWithData = store => {
 
   setEnvironmentData(store);
 };
+
+export const setupStoreWithDataForPanelCount = (store, panelCount) => {
+  const payloadPanelGroup = metricsDashboardPayload.panel_groups[0];
+
+  const panelGroupCustom = {
+    ...payloadPanelGroup,
+    panels: payloadPanelGroup.panels.slice(0, panelCount),
+  };
+
+  const metricsDashboardPayloadCustom = {
+    ...metricsDashboardPayload,
+    panel_groups: [panelGroupCustom],
+  };
+
+  store.commit(
+    `monitoringDashboard/${types.RECEIVE_METRICS_DASHBOARD_SUCCESS}`,
+    metricsDashboardPayloadCustom,
+  );
+
+  setMetricResult({ store, result: metricsResult, panel: 0 });
+};