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import { IContextualMenuItem } from '@fluentui/react/lib/ContextualMenu';
import { HoverCard, HoverCardType, IExpandingCardProps } from '@fluentui/react/lib/HoverCard';
import { classNamesFunction, find, getNativeProps, buttonProperties } from '@fluentui/react/lib/Utilities';
import { ResizeGroup } from '@fluentui/react/lib/ResizeGroup';
import { IProcessedStyleSet } from '@fluentui/react/lib/Styling';
import { OverflowSet, IOverflowSetItemProps } from '@fluentui/react/lib/OverflowSet';
import { FocusZone, FocusZoneDirection, FocusZoneTabbableElements } from '@fluentui/react-focus';
import {
ILegend,
ILegendsProps,
LegendShape,
ILegendsStyles,
ILegendStyleProps,
ILegendOverflowData,
} from './Legends.types';
import { Shape } from './shape';
const getClassNames = classNamesFunction<ILegendStyleProps, ILegendsStyles>();
// This is an internal interface used for rendering the legends with unique key
interface ILegendItem extends React.ButtonHTMLAttributes<HTMLButtonElement> {
name?: string;
title: string;
action: VoidFunction;
hoverAction: VoidFunction;
onMouseOutAction: VoidFunction;
color: string;
shape?: LegendShape;
key: number;
opacity?: number;
stripePattern?: boolean;
isLineLegendInBarChart?: boolean;
}
export interface ILegendState {
activeLegend: string;
isHoverCardVisible: boolean;
/** Set of legends selected, both for multiple selection and single selection */
selectedLegends: { [key: string]: boolean };
}
export class LegendsBase extends React.Component<ILegendsProps, ILegendState> {
private _hoverCardRef: HTMLDivElement;
private _classNames: IProcessedStyleSet<ILegendsStyles>;
/** Boolean variable to check if one or more legends are selected */
private _isLegendSelected = false;
public constructor(props: ILegendsProps) {
super(props);
let defaultSelectedLegends = {};
if (props.canSelectMultipleLegends) {
defaultSelectedLegends =
props.defaultSelectedLegends?.reduce((combinedDict, key) => ({ [key]: true, ...combinedDict }), {}) || {};
} else Iif (props.defaultSelectedLegend) {
defaultSelectedLegends = { [props.defaultSelectedLegend]: true };
}
this.state = {
activeLegend: '',
isHoverCardVisible: false,
selectedLegends: defaultSelectedLegends,
};
}
public render(): JSX.Element {
const { theme, className, styles } = this.props;
this._classNames = getClassNames(styles!, {
theme: theme!,
className,
});
this._isLegendSelected = Object.keys(this.state.selectedLegends).length > 0;
const dataToRender = this._generateData();
return (
<div className={this._classNames.root}>
{this.props.enabledWrapLines ? (
this._onRenderData(dataToRender)
) : (
<ResizeGroup
data={dataToRender}
onReduceData={this._onReduceData}
onRenderData={this._onRenderData}
onGrowData={this._onGrowData}
/>
)}
</div>
);
}
private _generateData(): ILegendOverflowData {
const { allowFocusOnLegends = true, shape } = this.props;
const dataItems: ILegendItem[] = this.props.legends.map((legend: ILegend, index: number) => {
return {
...(allowFocusOnLegends && {
nativeButtonProps: getNativeProps<React.HTMLAttributes<HTMLButtonElement>>(legend, buttonProperties, [
'title',
]),
'aria-setsize': this.props.legends.length,
'aria-posinset': index + 1,
}),
title: legend.title,
action: legend.action!,
hoverAction: legend.hoverAction!,
onMouseOutAction: legend.onMouseOutAction!,
color: legend.color,
shape: shape ? shape : legend.shape,
stripePattern: legend.stripePattern,
isLineLegendInBarChart: legend.isLineLegendInBarChart,
opacity: legend.opacity,
key: index,
};
});
const result: ILegendOverflowData = {
primary: dataItems,
overflow: [],
};
return result;
}
private _onRenderData = (data: IOverflowSetItemProps | ILegendOverflowData): JSX.Element => {
const { overflowProps, allowFocusOnLegends = true, canSelectMultipleLegends = false } = this.props;
const rootStyles = {
root: {
justifyContent: this.props.centerLegends ? 'center' : 'unset',
flexWrap: 'wrap',
},
};
return (
<FocusZone
{...(allowFocusOnLegends && {
role: 'listbox',
'aria-label': 'Legends',
'aria-multiselectable': canSelectMultipleLegends,
})}
>
<OverflowSet
items={data.primary}
overflowItems={data.overflow}
onRenderItem={this._renderButton}
onRenderOverflowButton={this._renderOverflowItems}
{...overflowProps}
styles={{ ...rootStyles, ...overflowProps?.styles }}
/>
</FocusZone>
);
};
private _onReduceData = (currentdata: IOverflowSetItemProps): {} | void => {
Iif (currentdata.primary.length === 0) {
return;
}
const overflow = [...currentdata.primary.slice(-1), ...currentdata.overflow];
const primary = currentdata.primary.slice(0, -1);
return { primary, overflow };
};
private _onGrowData = (currentdata: IOverflowSetItemProps): {} | void => {
Iif (currentdata.overflow.length === 0) {
return;
}
const overflow = currentdata.overflow.slice(1);
const primary = [...currentdata.primary, ...currentdata.overflow.slice(0, 1)];
return { primary, overflow };
};
/**
* This function will get called when there is an ability to
* select multiple legends
* @param legend ILegend
*/
private _canSelectMultipleLegends = (legend: ILegend): { [key: string]: boolean } => {
let selectedLegends = { ...this.state.selectedLegends };
Iif (selectedLegends[legend.title]) {
// Delete entry for the deselected legend to make
// the number of keys equal to the number of selected legends
delete selectedLegends[legend.title];
} else {
selectedLegends[legend.title] = true;
// Clear set if all legends are selected
Iif (Object.keys(selectedLegends).length === this.props.legends.length) {
selectedLegends = {};
}
}
this.setState({ selectedLegends });
return selectedLegends;
};
/**
* This function will get called when there is
* ability to select only single legend
* @param legend ILegend
*/
private _canSelectOnlySingleLegend = (legend: ILegend): boolean => {
if (this.state.selectedLegends[legend.title]) {
this.setState({ selectedLegends: {} });
return false;
} else {
this.setState({ selectedLegends: { [legend.title]: true } });
return true;
}
};
private _onClick = (legend: ILegend, event: React.MouseEvent<HTMLButtonElement>): void => {
const { canSelectMultipleLegends = false } = this.props;
let selectedLegends: string[] = [];
if (canSelectMultipleLegends) {
const nextSelectedLegends = this._canSelectMultipleLegends(legend);
selectedLegends = Object.keys(nextSelectedLegends);
} else {
const isSelected = this._canSelectOnlySingleLegend(legend);
selectedLegends = isSelected ? [legend.title] : [];
}
this.props.onChange?.(selectedLegends, event, legend);
legend.action?.();
};
private _onRenderCompactCard = (expandingCard: IExpandingCardProps): JSX.Element => {
const { allowFocusOnLegends = true, className, styles, theme, canSelectMultipleLegends = false } = this.props;
const overflowHoverCardLegends: JSX.Element[] = [];
const classNames = getClassNames(styles!, {
theme: theme!,
className,
});
expandingCard.renderData.forEach((legend: IOverflowSetItemProps, index: number) => {
const hoverCardElement = this._renderButton(legend, index, true);
overflowHoverCardLegends.push(hoverCardElement);
});
const hoverCardData = (
<FocusZone
{...(allowFocusOnLegends && {
role: 'listbox',
'aria-label': 'Legends',
'aria-multiselectable': canSelectMultipleLegends,
})}
direction={FocusZoneDirection.vertical}
handleTabKey={FocusZoneTabbableElements.all}
isCircularNavigation={true}
{...this.props.focusZonePropsInHoverCard}
className={classNames.hoverCardRoot}
>
{overflowHoverCardLegends}
</FocusZone>
);
return hoverCardData;
};
private _renderOverflowItems = (legends: ILegend[]) => {
const { allowFocusOnLegends = true } = this.props;
const items: IContextualMenuItem[] = [];
legends.forEach((legend: ILegend, i: number) => {
items.push({ key: i.toString(), name: legend.title, onClick: legend.action });
});
const renderOverflowData: IExpandingCardProps = { renderData: legends };
const { theme, className, styles, overflowText } = this.props;
const classNames = getClassNames(styles!, {
theme: theme!,
className,
});
const plainCardProps = {
onRenderPlainCard: this._onRenderCompactCard,
renderData: renderOverflowData,
};
const overflowString = overflowText ? overflowText : 'more';
// execute similar to "_onClick" and "_onLeave" logic at HoverCard onCardHide event
const onHoverCardHideHandler = () => {
this.setState({ isHoverCardVisible: false });
// Unhighlight the focused legend in the hover card
const activeOverflowItem = find(legends, (legend: ILegend) => legend.title === this.state.activeLegend);
Iif (activeOverflowItem) {
this.setState({ activeLegend: '' });
Iif (activeOverflowItem.onMouseOutAction) {
activeOverflowItem.onMouseOutAction();
}
}
};
return (
<HoverCard
type={HoverCardType.plain}
plainCardProps={plainCardProps}
instantOpenOnClick={true}
// eslint-disable-next-line react/jsx-no-bind
onCardHide={onHoverCardHideHandler}
setInitialFocus={true}
trapFocus={true}
onCardVisible={this._hoverCardVisible}
styles={classNames.subComponentStyles.hoverCardStyles}
cardDismissDelay={300}
target={this._hoverCardRef}
>
<div
className={classNames.overflowIndicationTextStyle}
ref={(rootElem: HTMLDivElement) => (this._hoverCardRef = rootElem)}
{...(allowFocusOnLegends && {
role: 'button',
'aria-expanded': this.state.isHoverCardVisible,
'aria-label': `${items.length} ${overflowString}`,
})}
data-is-focusable={allowFocusOnLegends}
>
{items.length} {overflowString}
</div>
</HoverCard>
);
};
private _hoverCardVisible = () => {
this.setState({ isHoverCardVisible: true });
};
private _onHoverOverLegend = (legend: ILegend) => {
if (legend.hoverAction) {
this.setState({ activeLegend: legend.title });
legend.hoverAction();
}
};
private _onLeave = (legend: ILegend) => {
if (legend.onMouseOutAction) {
this.setState({ activeLegend: '' });
legend.onMouseOutAction();
}
};
private _renderButton = (data: IOverflowSetItemProps, index?: number, overflow?: boolean) => {
const { allowFocusOnLegends = true } = this.props;
const legend: ILegend = {
title: data.title,
color: data.color,
shape: data.shape,
action: data.action,
hoverAction: data.hoverAction,
onMouseOutAction: data.onMouseOutAction,
stripePattern: data.stripePattern,
isLineLegendInBarChart: data.isLineLegendInBarChart,
opacity: data.opacity,
};
const color = this._getColor(legend.title, legend.color);
const { theme, className, styles } = this.props;
const classNames = getClassNames(styles!, {
theme: theme!,
className,
colorOnSelectedState: color,
borderColor: legend.color,
overflow,
stripePattern: legend.stripePattern,
isLineLegendInBarChart: legend.isLineLegendInBarChart,
opacity: legend.opacity,
});
const onClickHandler = (event: React.MouseEvent<HTMLButtonElement>) => {
this._onClick(legend, event);
};
const onHoverHandler = () => {
this._onHoverOverLegend(legend);
};
const onMouseOut = () => {
this._onLeave(legend);
};
const shape = this._getShape(classNames, legend, color);
return (
<button
{...(allowFocusOnLegends && {
'aria-selected': !!this.state.selectedLegends[legend.title],
role: 'option',
'aria-label': `${legend.title}`,
'aria-setsize': data['aria-setsize'],
'aria-posinset': data['aria-posinset'],
})}
{...(data.nativeButtonProps && { ...data.nativeButtonProps })}
key={index}
className={classNames.legend}
onClick={onClickHandler}
onMouseOver={onHoverHandler}
onMouseOut={onMouseOut}
onFocus={onHoverHandler}
onBlur={onMouseOut}
data-is-focusable={allowFocusOnLegends}
/* eslint-enable react/jsx-no-bind */
>
{shape}
<div className={classNames.text}>{legend.title}</div>
</button>
);
};
private _getShape(
classNames: IProcessedStyleSet<ILegendsStyles>,
legend: ILegend,
color: string,
): React.ReactNode | string {
const svgParentProps: React.SVGAttributes<SVGElement> = {
className: classNames.shape,
};
const svgChildProps: React.SVGAttributes<SVGElement> = {
fill: color,
strokeWidth: 2,
stroke: legend.color,
};
return (
<Shape
svgProps={svgParentProps}
pathProps={svgChildProps}
shape={legend.shape as LegendShape}
classNameForNonSvg={classNames.rect}
/>
);
}
private _getColor(title: string, color: string): string {
const { theme } = this.props;
let legendColor = color;
// if one or more legends are selected
if (this._isLegendSelected) {
// if the given legend (title) is one of the selected legends
if (this.state.selectedLegends[title]) {
legendColor = color;
}
// if the given legend is unselected
else {
legendColor = theme!.semanticColors.buttonBackground;
}
}
// if no legend is selected
else {
// if the given legend is hovered
// or none of the legends is hovered
if (this.state.activeLegend === title || this.state.activeLegend === '') {
legendColor = color;
}
// if there is a hovered legend but the given legend is not the one
else {
legendColor = theme!.semanticColors.buttonBackground;
}
}
return legendColor;
}
}
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