Forms: introduce RadioButtonGroup (#20828)

* introduce checkbox theme variables

* Add checkbox component

* Style tweaks

* Namespace form styles returned from getFormStyles

* wip

* Radio button ui

* Add simple docs for RadioButtonGroup

* Merge fix

* Move radio button variables from theme to component style getter

packages/grafana-ui/src/components/Forms/Button.tsx

@@ -3,7 +3,7 @@ import { css, cx } from 'emotion';
 import tinycolor from 'tinycolor2';
 import { selectThemeVariant, stylesFactory, ThemeContext } from '../../themes';
 import { Button as DefaultButton, LinkButton as DefaultLinkButton } from '../Button/Button';
-import { getFocusStyle } from './commonStyles';
+import { getFocusStyle, getPropertiesForButtonSize } from './commonStyles';
 import { ButtonSize, StyleDeps } from '../Button/types';
 import { GrafanaTheme } from '@grafana/data';
 
@@ -21,38 +21,6 @@ const buttonVariantStyles = (from: string, to: string, textColor: string) => css
   }
 `;
 
-const getPropertiesForSize = (theme: GrafanaTheme, size: ButtonSize) => {
-  switch (size) {
-    case 'sm':
-      return {
-        padding: `0 ${theme.spacing.sm}`,
-        fontSize: theme.typography.size.sm,
-        height: theme.height.sm,
-      };
-
-    case 'md':
-      return {
-        padding: `0 ${theme.spacing.md}`,
-        fontSize: theme.typography.size.md,
-        height: `${theme.spacing.formButtonHeight}px`,
-      };
-
-    case 'lg':
-      return {
-        padding: `0 ${theme.spacing.lg}`,
-        fontSize: theme.typography.size.lg,
-        height: theme.height.lg,
-      };
-
-    default:
-      return {
-        padding: `0 ${theme.spacing.md}`,
-        fontSize: theme.typography.size.base,
-        height: theme.height.md,
-      };
-  }
-};
-
 const getPropertiesForVariant = (theme: GrafanaTheme, variant: ButtonVariant) => {
   switch (variant) {
     case 'secondary':
@@ -96,7 +64,7 @@ const getPropertiesForVariant = (theme: GrafanaTheme, variant: ButtonVariant) =>
 // Need to do this because of mismatch between variants in standard buttons and here
 type StyleProps = Omit<StyleDeps, 'variant'> & { variant: ButtonVariant };
 export const getButtonStyles = stylesFactory(({ theme, size, variant }: StyleProps) => {
-  const { padding, fontSize, height } = getPropertiesForSize(theme, size);
+  const { padding, fontSize, height } = getPropertiesForButtonSize(theme, size);
   const { background, borderColor } = getPropertiesForVariant(theme, variant);
 
   return {
@@ -107,14 +75,14 @@ export const getButtonStyles = stylesFactory(({ theme, size, variant }: StylePro
         display: inline-flex;
         align-items: center;
         font-weight: ${theme.typography.weight.semibold};
-        font-size: ${fontSize};
         font-family: ${theme.typography.fontFamily.sansSerif};
         line-height: ${theme.typography.lineHeight.sm};
+        font-size: ${fontSize};
         padding: ${padding};
+        height: ${height};
         vertical-align: middle;
         cursor: pointer;
         border: 1px solid ${borderColor};
-        height: ${height};
         border-radius: ${theme.border.radius.sm};
         ${background};
 

packages/grafana-ui/src/components/Forms/RadioButtonGroup/RadioButton.story.tsx

@@ -0,0 +1,31 @@
+import React, { useState } from 'react';
+import { RadioButton, RadioButtonSize } from './RadioButton';
+import { boolean, select } from '@storybook/addon-knobs';
+
+export default {
+  title: 'UI/Forms/RadioButton',
+  component: RadioButton,
+};
+
+const sizes: RadioButtonSize[] = ['sm', 'md'];
+
+export const simple = () => {
+  const [active, setActive] = useState();
+  const BEHAVIOUR_GROUP = 'Behaviour props';
+  const disabled = boolean('Disabled', false, BEHAVIOUR_GROUP);
+  const VISUAL_GROUP = 'Visual options';
+  const size = select<RadioButtonSize>('Size', sizes, 'md', VISUAL_GROUP);
+
+  return (
+    <RadioButton
+      disabled={disabled}
+      size={size}
+      active={active}
+      onClick={() => {
+        setActive(!active);
+      }}
+    >
+      Radio button
+    </RadioButton>
+  );
+};

packages/grafana-ui/src/components/Forms/RadioButtonGroup/RadioButton.tsx

@@ -0,0 +1,189 @@
+import React from 'react';
+import { useTheme, stylesFactory, selectThemeVariant as stv } from '../../../themes';
+import { GrafanaTheme } from '@grafana/data';
+import { css, cx } from 'emotion';
+import { getFocusCss, getPropertiesForButtonSize } from '../commonStyles';
+
+export type RadioButtonSize = 'sm' | 'md';
+export interface RadioButtonProps {
+  size?: RadioButtonSize;
+  disabled?: boolean;
+  active: boolean;
+  onClick: () => void;
+}
+
+const getRadioButtonStyles = stylesFactory((theme: GrafanaTheme, size: RadioButtonSize) => {
+  const { padding, fontSize, height } = getPropertiesForButtonSize(theme, size);
+  const c = theme.colors;
+
+  const textColor = stv({ light: c.gray33, dark: c.gray70 }, theme.type);
+  const textColorHover = stv({ light: c.blueShade, dark: c.blueLight }, theme.type);
+  const textColorActive = stv({ light: c.blueShade, dark: c.blueLight }, theme.type);
+  const borderColor = stv({ light: c.gray4, dark: c.gray25 }, theme.type);
+  const borderColorHover = stv({ light: c.gray70, dark: c.gray33 }, theme.type);
+  const borderColorActive = stv({ light: c.blueShade, dark: c.blueLight }, theme.type);
+  const bg = stv({ light: c.gray98, dark: c.gray10 }, theme.type);
+  const bgDisabled = stv({ light: c.gray95, dark: c.gray15 }, theme.type);
+  const bgActive = stv({ light: c.white, dark: c.gray05 }, theme.type);
+
+  const border = `1px solid ${borderColor}`;
+  const borderActive = `1px solid ${borderColorActive}`;
+  const borderHover = `1px solid ${borderColorHover}`;
+  const fakeBold = `0 0 0.65px ${textColorHover}, 0 0 0.65px ${textColorHover}`;
+
+  return {
+    button: css`
+      cursor: pointer;
+      position: relative;
+      z-index: 0;
+      background: ${bg};
+      border: ${border};
+      color: ${textColor};
+      font-size: ${fontSize};
+      padding: ${padding};
+      height: ${height};
+      border-left: 0;
+
+      /* This pseudo element is responsible for rendering the lines between buttons when they are groupped */
+      &:before {
+        content: '';
+        position: absolute;
+        top: -1px;
+        left: -1px;
+        width: 1px;
+        height: calc(100% + 2px);
+      }
+
+      &:hover {
+        border: ${borderHover};
+        border-left: 0;
+        &:before {
+          /* renders line between elements */
+          background: ${borderColorHover};
+        }
+        &:first-child {
+          border-left: ${borderHover};
+        }
+        &:last-child {
+          border-right: ${borderHover};
+        }
+        &:first-child:before {
+          /* Don't render divider line on first element*/
+          display: none;
+        }
+      }
+
+      &:not(:disabled):hover {
+        color: ${textColorHover};
+        /* The text shadow imitates font-weight:bold;
+         * Using font weight on hover makes the button size slighlty change which looks like a glitch
+         * */
+        text-shadow: ${fakeBold};
+      }
+
+      &:focus {
+        z-index: 1;
+        ${getFocusCss(theme)};
+        &:before {
+          background: ${borderColor};
+        }
+        &:hover {
+          &:before {
+            background: ${borderColorHover};
+          }
+        }
+      }
+
+      &:disabled {
+        background: ${bgDisabled};
+        color: ${textColor};
+      }
+
+      &:first-child {
+        border-top-left-radius: ${theme.border.radius.sm};
+        border-bottom-left-radius: ${theme.border.radius.sm};
+        border-left: ${border};
+      }
+      &:last-child {
+        border-top-right-radius: ${theme.border.radius.sm};
+        border-bottom-right-radius: ${theme.border.radius.sm};
+        border-right: ${border};
+      }
+    `,
+
+    buttonActive: css`
+      background: ${bgActive};
+      border: ${borderActive};
+      border-left: none;
+      color: ${textColorActive};
+      text-shadow: ${fakeBold};
+
+      &:hover {
+        border: ${borderActive};
+        border-left: none;
+      }
+
+      &:focus {
+        &:before {
+          background: ${borderColorActive};
+        }
+        &:hover:before {
+          background: ${borderColorActive};
+        }
+      }
+
+      &:before,
+      &:hover:before {
+        background: ${borderColorActive};
+      }
+
+      &:first-child,
+      &:first-child:hover {
+        border-left: ${borderActive};
+      }
+      &:last-child,
+      &:last-child:hover {
+        border-right: ${borderActive};
+      }
+
+      &:first-child {
+        &:before {
+          display: none;
+        }
+      }
+
+      & + button:hover {
+        &:before {
+          display: none;
+        }
+      }
+      &:focus {
+        border-color: ${borderActive};
+      }
+    `,
+  };
+});
+
+export const RadioButton: React.FC<RadioButtonProps> = ({
+  children,
+  active = false,
+  disabled = false,
+  size = 'md',
+  onClick,
+}) => {
+  const theme = useTheme();
+  const styles = getRadioButtonStyles(theme, size);
+
+  return (
+    <button
+      type="button"
+      className={cx(styles.button, active && styles.buttonActive)}
+      onClick={onClick}
+      disabled={disabled}
+    >
+      {children}
+    </button>
+  );
+};
+
+RadioButton.displayName = 'RadioButton';

packages/grafana-ui/src/components/Forms/RadioButtonGroup/RadioButtonGroup.mdx

@@ -0,0 +1,44 @@
+import { Meta, Story, Preview, Props } from '@storybook/addon-docs/blocks';
+import { RadioButtonGroup } from './RadioButtonGroup';
+
+<Meta title="MDX|RadioButtonGroup" component={RadioButtonGroup} />
+
+# RadioButtonGroup
+
+`RadioButtonGroup` is used for selecting single value from multiple options.
+
+Use `RadioButtonGroup` if there are up to four options available. Otherwise use Select component.
+
+### Usage
+
+```jsx
+import { Forms } from '@grafana/ui';
+
+<Forms.RadioButtonGroup options={...} value={...} onChange={...} />
+```
+
+#### Disabling options
+
+To disable some options pass those options to the `RadioButtonGroup` via `disabledOptions` property:
+
+```jsx
+
+const options = [
+  { label: 'Prometheus', value: 'prometheus' },
+  { label: 'Graphite', value: 'graphite' },
+  { label: 'Elastic', value: 'elastic' },
+  { label: 'InfluxDB', value: 'influx' },
+];
+
+const disabledOptions = ['prometheus', 'elastic'];
+
+
+<Forms.RadioButtonGroup
+  options={options}
+  disabledOptions={disabledOptions}
+  value={...}
+  onChange={...}
+/>
+```
+
+<Props of={RadioButtonGroup} />

packages/grafana-ui/src/components/Forms/RadioButtonGroup/RadioButtonGroup.story.tsx

@@ -0,0 +1,43 @@
+import React, { useState } from 'react';
+import mdx from './RadioButtonGroup.mdx';
+import { RadioButtonGroup } from './RadioButtonGroup';
+import { RadioButtonSize } from './RadioButton';
+import { boolean, select } from '@storybook/addon-knobs';
+
+export default {
+  title: 'UI/Forms/RadioButtonGroup',
+  component: RadioButtonGroup,
+  parameters: {
+    docs: {
+      page: mdx,
+    },
+  },
+};
+
+const sizes: RadioButtonSize[] = ['sm', 'md'];
+
+export const simple = () => {
+  const [selected, setSelected] = useState();
+  const BEHAVIOUR_GROUP = 'Behaviour props';
+  const disabled = boolean('Disabled', false, BEHAVIOUR_GROUP);
+  const disabledItem = select('Disabled item', ['', 'graphite', 'prometheus', 'elastic'], '', BEHAVIOUR_GROUP);
+  const VISUAL_GROUP = 'Visual options';
+  const size = select<RadioButtonSize>('Size', sizes, 'md', VISUAL_GROUP);
+
+  const options = [
+    { label: 'Prometheus', value: 'prometheus' },
+    { label: 'Graphite', value: 'graphite' },
+    { label: 'Elastic', value: 'elastic' },
+  ];
+
+  return (
+    <RadioButtonGroup
+      options={options}
+      disabled={disabled}
+      disabledOptions={[disabledItem]}
+      value={selected}
+      onChange={setSelected}
+      size={size}
+    />
+  );
+};

packages/grafana-ui/src/components/Forms/RadioButtonGroup/RadioButtonGroup.tsx

@@ -0,0 +1,57 @@
+import React from 'react';
+import { css } from 'emotion';
+import { SelectableValue } from '@grafana/data';
+import { RadioButtonSize, RadioButton } from './RadioButton';
+
+const getRadioButtonGroupStyles = () => {
+  return {
+    wrapper: css`
+      display: flex;
+      flex-direction: row;
+      flex-wrap: nowrap;
+      position: relative;
+    `,
+  };
+};
+interface RadioButtonGroupProps<T> {
+  value: T;
+  disabled?: boolean;
+  disabledOptions?: T[];
+  options: Array<SelectableValue<T>>;
+  onChange: (value?: T) => void;
+  size?: RadioButtonSize;
+}
+
+export function RadioButtonGroup<T>({
+  options,
+  value,
+  onChange,
+  disabled,
+  disabledOptions,
+  size = 'md',
+}: RadioButtonGroupProps<T>) {
+  const styles = getRadioButtonGroupStyles();
+
+  return (
+    <div className={styles.wrapper}>
+      {options.map(o => {
+        const isItemDisabled = disabledOptions && o.value && disabledOptions.indexOf(o.value) > -1;
+        return (
+          <RadioButton
+            size={size}
+            disabled={isItemDisabled || disabled}
+            active={value === o.value}
+            key={o.label}
+            onClick={() => {
+              onChange(o.value);
+            }}
+          >
+            {o.label}
+          </RadioButton>
+        );
+      })}
+    </div>
+  );
+}
+
+RadioButtonGroup.displayName = 'RadioButtonGroup';

packages/grafana-ui/src/components/Forms/commonStyles.ts

@@ -1,5 +1,6 @@
 import { css } from 'emotion';
 import { GrafanaTheme } from '@grafana/data';
+import { ButtonSize } from '../Button/types';
 
 export const getFocusCss = (theme: GrafanaTheme) => `
   outline: 2px dotted transparent;
@@ -56,3 +57,35 @@ export const inputSizes = () => {
     `,
   };
 };
+
+export const getPropertiesForButtonSize = (theme: GrafanaTheme, size: ButtonSize) => {
+  switch (size) {
+    case 'sm':
+      return {
+        padding: `0 ${theme.spacing.sm}`,
+        fontSize: theme.typography.size.sm,
+        height: theme.height.sm,
+      };
+
+    case 'md':
+      return {
+        padding: `0 ${theme.spacing.md}`,
+        fontSize: theme.typography.size.md,
+        height: `${theme.spacing.formButtonHeight}px`,
+      };
+
+    case 'lg':
+      return {
+        padding: `0 ${theme.spacing.lg}`,
+        fontSize: theme.typography.size.lg,
+        height: theme.height.lg,
+      };
+
+    default:
+      return {
+        padding: `0 ${theme.spacing.md}`,
+        fontSize: theme.typography.size.base,
+        height: theme.height.md,
+      };
+  }
+};