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selection.ts
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selection.ts
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export interface SelectionItem {
id: string | number
[key: string]: unknown // TODO: Ring UI 7.0 drop this index type as it forces users to have index type in their data
}
export interface TableSelectionConfig<T extends SelectionItem> {
data?: readonly T[] | undefined
selected?: Set<T> | undefined
focused?: T | null | undefined
getKey?: ((item: T) => string | number) | undefined
isItemSelectable?: ((item: T) => boolean | undefined) | undefined
getChildren?: ((item: T) => readonly T[]) | undefined
}
export interface CloneWithConfig<T> {
data?: readonly T[] | null | undefined
selected?: Set<T> | readonly T[] | null | undefined
focused?: T | null | undefined
}
export default class Selection<T extends SelectionItem> {
private _rawData: readonly T[];
protected _getChildren: ((item: T) => readonly T[]);
protected _data: Set<T>;
protected _selected: Set<T>;
protected _focused: T | null;
private _getKey: (item: T) => string | number;
protected _isItemSelectable: (item: T) => boolean | undefined;
constructor({
data = [],
selected = new Set(),
focused = null,
getKey = item => item.id,
getChildren = () => [],
isItemSelectable = () => true
}: TableSelectionConfig<T> = {}) {
this._rawData = data;
this._getChildren = getChildren;
this._data = this._buildData(data);
this._selected = selected;
this._focused = focused;
this._getKey = getKey;
this._isItemSelectable = isItemSelectable;
}
protected _buildData(data: readonly T[] | null | undefined) {
return new Set(data);
}
protected _buildSelected(data: Set<T>, selected: Set<T>) {
return new Set(selected);
}
cloneWith({data, selected, focused}: CloneWithConfig<T>) {
const newData = data || this._rawData;
let newSelected;
if (data && !selected) {
newSelected = new Set([...this._buildData(newData)].
filter(item => [...this._selected].some(it => this._getKey(item) === this._getKey(it))));
newSelected = this._buildSelected(this._buildData(newData), newSelected);
} else if (selected) {
newSelected = selected;
} else {
newSelected = this._selected;
}
newSelected = new Set([...newSelected].filter(item => this._isItemSelectable(item)));
const cloneFocus = () => [...this._buildData(data)].filter(
item => this._focused && this._getKey(item) === this._getKey(this._focused)
)[0];
const newFocused = focused === undefined ? this._focused : focused;
return new (this.constructor as typeof Selection)({
data: newData,
selected: newSelected,
focused: (data && !focused) ? cloneFocus() : newFocused,
getKey: this._getKey,
getChildren: this._getChildren,
isItemSelectable: this._isItemSelectable
});
}
focus(value: T | null | undefined) {
return this.cloneWith({focused: value});
}
moveUp() {
const focused = this._focused;
const data = [...this._data];
if (!focused) {
return this.cloneWith({focused: data[data.length - 1]});
}
const nextItem = data[data.indexOf(focused) - 1];
if (nextItem) {
return this.cloneWith({focused: nextItem});
}
return undefined;
}
moveDown() {
const focused = this._focused;
const data = [...this._data];
if (!focused) {
return this.cloneWith({focused: data[0]});
}
const nextItem = data[data.indexOf(focused) + 1];
if (nextItem) {
return this.cloneWith({focused: nextItem});
}
return undefined;
}
moveStart() {
const data = [...this._data];
if (data.length) {
return this.cloneWith({focused: data[0]});
}
return undefined;
}
moveEnd() {
const data = [...this._data];
if (data.length) {
return this.cloneWith({focused: data.pop()});
}
return undefined;
}
select(value = this._focused) {
if (!value || !this._isItemSelectable(value)) {
return this;
}
const selected = new Set(this._selected);
selected.add(value);
return this.cloneWith({selected});
}
deselect(value = this._focused) {
if (!value || !this._isItemSelectable(value)) {
return this;
}
const selected = new Set(this._selected);
selected.delete(value);
return this.cloneWith({selected});
}
toggleSelection(value = this._focused) {
if (this.isSelected(value)) {
return this.deselect(value);
} else {
return this.select(value);
}
}
selectAll() {
return this.cloneWith({selected: [...this._data]});
}
resetFocus() {
return this.cloneWith({focused: null});
}
resetSelection() {
return this.cloneWith({selected: new Set()});
}
reset() {
return this.resetFocus().resetSelection();
}
isFocused(value: T | null) {
return this._focused === value;
}
isSelected(value: T | null) {
return value != null && this._selected.has(value);
}
getFocused() {
return this._focused;
}
getSelected() {
return new Set(this._selected);
}
getActive(): Set<T> {
if (this._selected.size) {
return new Set(this._selected);
} else if (this._focused) {
return new Set([this._focused]);
} else {
return new Set();
}
}
}