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import * as React from 'react';
import { SvgIconProps } from '@material-ui/core/SvgIcon';
import { List, ListItem, TextField, ListItemText, ListItemIcon, WithTheme, withTheme, Omit } from '@material-ui/core';
import FileIcon from '@material-ui/icons/InsertDriveFile';
import CloseIcon from '@material-ui/icons/ExpandLess';
import OpenIcon from '@material-ui/icons/ExpandMore';
import FolderIcon from '@material-ui/icons/Folder';
export interface ITreeItem {
disabled?: boolean;
icon?: React.ComponentType<SvgIconProps>;
}
type TreeViewComponentState<TData extends ITreeItem = ITreeItem> = {
/** All indices of all expanded Items */
expandedItems: TData[];
/** The index of the active iten or undefined if no item is active. */
activeItem: undefined | TData;
/** The search term or undefined if search is corrently not active. */
searchTerm: undefined | string;
}
type TreeViewComponentBaseProps<TData extends ITreeItem = ITreeItem> = WithTheme & {
items: TData[];
contentProperty: keyof Omit<TData, keyof ITreeItem>;
childrenProperty: keyof Omit<TData, keyof ITreeItem>;
useFolderIcons?: boolean;
enableSearchBar?: boolean;
autoExpandFolder?: boolean;
style?: React.CSSProperties;
itemHeight?: number;
depthOffset?: number;
}
type TreeViewComponentWithInternalStateProps<TData extends ITreeItem = ITreeItem> = TreeViewComponentBaseProps<TData> & {
onItemClick?: (item: TData) => void;
onFolderClick?: (item: TData) => void;
}
type TreeViewComponentWithExternalStateProps<TData extends ITreeItem = ITreeItem> = TreeViewComponentBaseProps<TData> & TreeViewComponentState<TData> & {
onSearch: (searchTerm: string) => void;
onItemClick: (item: TData) => void;
onFolderClick: (item: TData) => void;
}
type TreeViewComponentProps<TData extends ITreeItem = ITreeItem> =
TreeViewComponentWithInternalStateProps<TData> |
TreeViewComponentWithExternalStateProps<TData>;
function isTreeViewComponentWithExternalStateProps<TData extends ITreeItem = ITreeItem>(props: TreeViewComponentProps<TData>): props is TreeViewComponentWithExternalStateProps<TData> {
const propsWithExternalState = (props as TreeViewComponentWithExternalStateProps<TData>)
return (
propsWithExternalState.onSearch instanceof Function ||
propsWithExternalState.expandedItems !== undefined ||
propsWithExternalState.activeItem !== undefined ||
propsWithExternalState.searchTerm !== undefined
);
}
class TreeViewComponent<TData extends ITreeItem> extends React.Component<TreeViewComponentProps<TData>, TreeViewComponentState> {
/**
* Initializes a new instance.
*/
constructor(props: TreeViewComponentProps<TData>) {
super(props);
this.state = {
expandedItems: [],
activeItem: undefined,
searchTerm: undefined
};
}
render(): JSX.Element {
this.itemIndex = 0;
const { searchTerm } = this.state;
const { children, items, enableSearchBar } = this.props;
const styles = {
root: {
padding: 0,
paddingBottom: 8,
paddingTop: children ? 0 : 8,
...this.props.style
},
search: {
padding: `0px ${ this.props.theme.spacing.unit }px`
}
};
return (
<div style={ styles.root }>
{ children }
{ enableSearchBar && <TextField label={ "Search" } fullWidth={ true } style={ styles.search } value={ searchTerm } onChange={ this.onChangeSearchText } /> || null }
<List>
{ this.renderItems(items, searchTerm && searchTerm.toLowerCase()) }
</List>
</div>
);
}
private itemIndex: number = 0;
private renderItems = (items: TData[], searchTerm: string | undefined, depth: number = 1) => {
return items.reduce((acc, item) => {
const children = this.props.childrenProperty && ((item as any)[this.props.childrenProperty] as TData[]);
const childrenJsx = children && this.renderItems(children, searchTerm, depth + 1);
const expanded = searchTerm
? children && childrenJsx.length > 0
: !children
? false
: this.state.expandedItems.indexOf(item) > -1;
const isFolder = children !== undefined;
const itemJsx = this.renderItem(item, searchTerm, depth, isFolder, expanded);
itemJsx && acc.push(itemJsx);
if (isFolder && expanded) {
acc.push(...childrenJsx);
}
return acc;
}, [] as JSX.Element[]);
}
private renderItem = (item: TData, searchTerm: string | undefined, depth: number, isFolder: boolean, expanded: boolean): JSX.Element | null => {
const styles = {
item: {
paddingLeft: (((this.props.depthOffset || 0) + depth) * this.props.theme.spacing.unit * 3),
backgroundColor: this.state.activeItem === item ? this.props.theme.palette.action.selected : undefined,
height: this.props.itemHeight || undefined,
cursor: item.disabled ? 'not-allowed' : 'pointer',
color: item.disabled ? this.props.theme.palette.text.disabled : this.props.theme.palette.text.primary,
overflow: 'hidden',
transform: 'translateZ(0)',
}
};
const text = (item as any)[this.props.contentProperty] as string || ''; // need to keep track of search
const matchIndex = searchTerm ? text.toLowerCase().indexOf(searchTerm) : -1;
const searchTermLength = searchTerm && searchTerm.length || 0;
const handleClickCreator = (isIcon: boolean) => (event: React.SyntheticEvent) => {
if (item.disabled) return;
event.preventDefault();
event.stopPropagation();
if (isFolder && (this.props.autoExpandFolder || isIcon)) {
this.props.onFolderClick ? this.props.onFolderClick(item) : this.onFolderClick(item);
} else {
this.props.onItemClick ? this.props.onItemClick(item) : this.onItemClick(item);
}
};
return ((searchTerm && (matchIndex > -1 || expanded) || !searchTerm)
? (
<ListItem key={ `tree-list-${ this.itemIndex++ }` } style={ styles.item } onClick={ handleClickCreator(false) } button >
{ // display the left icon
(this.props.useFolderIcons && <ListItemIcon>{ isFolder ? <FolderIcon /> : <FileIcon /> }</ListItemIcon>) ||
(item.icon && (<ListItemIcon><item.icon /></ListItemIcon>)) }
{ // highlight search result
matchIndex > -1
? (<span>
{ text.substring(0, matchIndex) }
<span
style={ {
display: 'inline-block',
backgroundColor: 'rgba(255,235,59,0.5)',
padding: '3px',
} }
>
{ text.substring(matchIndex, matchIndex + searchTermLength) }
</span>
{ text.substring(matchIndex + searchTermLength) }
</span>)
: (<ListItemText primary={ text } />)
}
{ // display the right icon, depending on the state
!isFolder ? null : expanded ? (<OpenIcon onClick={ handleClickCreator(true) } />) : (<CloseIcon onClick={ handleClickCreator(true) } />) }
</ListItem>
)
: null
);
}
private onFolderClick = (item: TData) => {
// toggle items with children
if (this.state.searchTerm) return;
const indexOfItemToToggle = this.state.expandedItems.indexOf(item);
if (indexOfItemToToggle === -1) {
this.setState({
expandedItems: [...this.state.expandedItems, item],
});
} else {
this.setState({
expandedItems: [
...this.state.expandedItems.slice(0, indexOfItemToToggle),
...this.state.expandedItems.slice(indexOfItemToToggle + 1),
]
});
}
};
private onItemClick = (item: TData) => {
// activate items without children
this.setState({
activeItem: item,
});
};
private onChangeSearchText = (event: React.ChangeEvent<HTMLInputElement>) => {
event.preventDefault();
event.stopPropagation();
if (isTreeViewComponentWithExternalStateProps(this.props)) {
this.props.onSearch(event.target.value)
} else {
this.setState({
searchTerm: event.target.value
});
}
};
static getDerivedStateFromProps(props: TreeViewComponentProps, state: TreeViewComponentState): TreeViewComponentState {
if (isTreeViewComponentWithExternalStateProps(props)) {
return {
...state,
expandedItems: props.expandedItems || [],
activeItem: props.activeItem,
searchTerm: props.searchTerm
};
}
return state;
}
public static defaultProps = {
useFolderIcons: false,
enableSearchBar: false,
autoExpandFolder: false,
depthOffset: 0
}
}
export type TreeViewCtorType<TData extends ITreeItem = ITreeItem> = new () => React.Component<Omit<TreeViewComponentProps<TData>, 'theme'>>;
export const TreeView = withTheme()(TreeViewComponent);
export default TreeView;
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