@grafana/ui: Create slider component (#22275)

* grafana/ui: Create slider

* grafana/ui: Create slider, tests, add to storybook

* Update Slider, minor changes

* Implement single value slider

* Update style

* Update packages/grafana-ui/package.json

Co-Authored-By: Dominik Prokop <dominik.prokop@grafana.com>

* Update packages/grafana-ui/src/components/Slider/Slider.tsx

Co-Authored-By: Dominik Prokop <dominik.prokop@grafana.com>

* Update slider, include PR review feedback

* Update packages/grafana-ui/src/components/Slider/Slider.tsx

Co-Authored-By: Dominik Prokop <dominik.prokop@grafana.com>

* Update packages/grafana-ui/src/components/Slider/Slider.tsx

Co-Authored-By: Dominik Prokop <dominik.prokop@grafana.com>

* Export orientatin types, gix selectability of tooltip text

* Remove Orientation export from grafana/ui

* Testing Global component to inject global styles

* Add comments

Co-authored-by: Dominik Prokop <dominik.prokop@grafana.com>

packages/grafana-ui/package.json

@@ -27,6 +27,7 @@
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
+    "@emotion/core": "^10.0.27",
     "@grafana/data": "6.7.0-pre",
     "@grafana/slate-react": "0.22.9-grafana",
     "@grafana/tsconfig": "^1.0.0-rc1",
@@ -47,6 +48,7 @@
     "papaparse": "4.6.3",
     "rc-cascader": "0.17.5",
     "rc-drawer": "3.0.2",
+    "rc-slider": "8.7.1",
     "rc-time-picker": "^3.7.2",
     "react": "16.12.0",
     "react-calendar": "2.19.2",
@@ -78,6 +80,7 @@
     "@types/node": "10.14.1",
     "@types/papaparse": "4.5.9",
     "@types/pretty-format": "20.0.1",
+    "@types/rc-slider": "8.6.5",
     "@types/react": "16.8.16",
     "@types/react-custom-scrollbars": "4.0.5",
     "@types/react-test-renderer": "16.9.0",

packages/grafana-ui/src/components/Slider/Slider.story.tsx

+import React from 'react';
+import { Slider } from './Slider';
+import { select, number, boolean } from '@storybook/addon-knobs';
+
+export default {
+  title: 'General/Slider',
+  component: Slider,
+};
+
+const getKnobs = () => {
+  return {
+    min: number('min', 0),
+    max: number('max', 100),
+    orientation: select('orientation', ['horizontal', 'vertical'], 'horizontal'),
+    reverse: boolean('reverse', true),
+    singleValue: boolean('single value', false),
+  };
+};
+
+const SliderWrapper = () => {
+  const { min, max, orientation, reverse, singleValue } = getKnobs();
+  return (
+    <div style={{ width: '200px', height: '200px' }}>
+      <Slider min={min} max={max} orientation={orientation} value={singleValue ? [10] : undefined} reverse={reverse} />
+    </div>
+  );
+};
+
+export const basic = () => <SliderWrapper />;

packages/grafana-ui/src/components/Slider/Slider.test.tsx

+import React from 'react';
+import { Slider, Props } from './Slider';
+import { mount } from 'enzyme';
+
+const sliderProps: Props = {
+  min: 10,
+  max: 20,
+};
+
+describe('Slider', () => {
+  it('renders without error', () => {
+    mount(<Slider {...sliderProps} />);
+  });
+  it('renders correct contents', () => {
+    const wrapper = mount(<Slider {...sliderProps} />);
+    expect(wrapper.html()).toContain('aria-valuemin="10"');
+    expect(wrapper.html()).toContain('aria-valuemax="20"');
+    expect(wrapper.html()).toContain('aria-valuenow="10"');
+    expect(wrapper.html()).toContain('aria-valuenow="20"');
+  });
+  it('renders correct contents with a value', () => {
+    const wrapper = mount(<Slider {...sliderProps} value={[15]} />);
+    expect(wrapper.html()).toContain('aria-valuenow="15"');
+    expect(wrapper.html()).not.toContain('aria-valuenow="20"');
+    expect(wrapper.html()).not.toContain('aria-valuenow="10"');
+  });
+});

packages/grafana-ui/src/components/Slider/Slider.tsx

+import React, { FunctionComponent } from 'react';
+import { Range, createSliderWithTooltip } from 'rc-slider';
+import { cx, css } from 'emotion';
+import { Global, css as cssCore } from '@emotion/core';
+import { stylesFactory } from '../../themes';
+import { GrafanaTheme } from '@grafana/data';
+import { useTheme } from '../../themes/ThemeContext';
+import { Orientation } from '../../types/orientation';
+
+export interface Props {
+  min: number;
+  max: number;
+  orientation?: Orientation;
+  /** Set current positions of handle(s). If only 1 value supplied, only 1 handle displayed. */
+  value?: number[];
+  reverse?: boolean;
+  formatTooltipResult?: (value: number) => number | string;
+  onChange?: (values: number[]) => void;
+}
+
+const getStyles = stylesFactory((theme: GrafanaTheme, isHorizontal: boolean) => {
+  const trackColor = theme.isLight ? theme.colors.gray5 : theme.colors.dark6;
+  const container = isHorizontal
+    ? css`
+        width: 100%;
+        margin: ${theme.spacing.lg} ${theme.spacing.sm} ${theme.spacing.sm} ${theme.spacing.sm};
+      `
+    : css`
+        height: 100%;
+        margin: ${theme.spacing.sm} ${theme.spacing.lg} ${theme.spacing.sm} ${theme.spacing.sm};
+      `;
+
+  return {
+    container,
+    slider: css`
+      .rc-slider-vertical .rc-slider-handle {
+        margin-top: -10px;
+      }
+      .rc-slider-handle {
+        border: solid 2px ${theme.colors.blue77};
+        background-color: ${theme.colors.blue77};
+      }
+      .rc-slider-handle:hover {
+        border-color: ${theme.colors.blue77};
+      }
+      .rc-slider-handle:focus {
+        border-color: ${theme.colors.blue77};
+        box-shadow: none;
+      }
+      .rc-slider-handle:active {
+        border-color: ${theme.colors.blue77};
+        box-shadow: none;
+      }
+      .rc-slider-handle-click-focused:focus {
+        border-color: ${theme.colors.blue77};
+      }
+      .rc-slider-dot-active {
+        border-color: ${theme.colors.blue77};
+      }
+      .rc-slider-track {
+        background-color: ${theme.colors.blue77};
+      }
+      .rc-slider-rail {
+        background-color: ${trackColor};
+        border: 1px solid ${trackColor};
+      }
+    `,
+    /** Global component from @emotion/core doesn't accept computed classname string returned from css from emotion.
+     * It accepts object containing the computed name and flattened styles returned from css from @emotion/core
+     * */
+    tooltip: cssCore`
+    body {
+      .rc-slider-tooltip {
+        cursor: grab;
+        user-select: none;
+      }
+
+      .rc-slider-tooltip-inner {
+        color: ${theme.colors.text};
+        background-color: transparent !important;
+        border-radius: 0;
+        box-shadow: none;
+      }
+
+      .rc-slider-tooltip-placement-top .rc-slider-tooltip-arrow {
+        display: none;
+      }
+
+      .rc-slider-tooltip-placement-top {
+        padding: 0;
+      }
+    }
+  `,
+  };
+});
+
+export const Slider: FunctionComponent<Props> = ({
+  min,
+  max,
+  onChange,
+  orientation = 'horizontal',
+  reverse,
+  formatTooltipResult,
+  value,
+}) => {
+  const isHorizontal = orientation === 'horizontal';
+  const theme = useTheme();
+  const styles = getStyles(theme, isHorizontal);
+  const RangeWithTooltip = createSliderWithTooltip(Range);
+  return (
+    <div className={cx(styles.container, styles.slider)}>
+      {/** Slider tooltip's parent component is body and therefore we need Global component to do css overrides for it. */}
+      <Global styles={styles.tooltip} />
+      <RangeWithTooltip
+        tipProps={{ visible: true, placement: isHorizontal ? 'top' : 'right' }}
+        min={min}
+        max={max}
+        defaultValue={value || [min, max]}
+        tipFormatter={(value: number) => (formatTooltipResult ? formatTooltipResult(value) : value)}
+        onChange={onChange}
+        vertical={!isHorizontal}
+        reverse={reverse}
+      />
+    </div>
+  );
+};
+
+Slider.displayName = 'Slider';

packages/grafana-ui/src/components/Slider/_Slider.scss

+@import '../../node_modules/rc-slider/assets/index.css';

packages/grafana-ui/src/components/index.scss

@@ -15,3 +15,4 @@
 @import 'Tooltip/Tooltip';
 @import 'ValueMappingsEditor/ValueMappingsEditor';
 @import 'Alert/Alert';
+@import 'Slider/Slider';

packages/grafana-ui/src/components/index.ts

@@ -115,6 +115,7 @@ export { Segment, SegmentAsync, SegmentInput, SegmentSelect } from './Segment/';
 export { default as Chart } from './Chart';
 export { Icon } from './Icon/Icon';
 export { Drawer } from './Drawer/Drawer';
+export { Slider } from './Slider/Slider';
 
 // TODO: namespace!!
 export {

packages/grafana-ui/src/types/orientation.ts

+export type Orientation = 'horizontal' | 'vertical';