predix-ui
Version:
px-* web components as React styled components
79 lines (78 loc) • 2.21 kB
JavaScript
export default class IronSelection {
constructor(props) {
this.selection = [];
this.selectCallback = props && props.selectCallback;
}
/**
* Retrieves the selected item(s).
*
* @method get
* @returns Returns the selected item(s). If the multi property is true,
* `get` will return an array, otherwise it will return
* the selected item or undefined if there is no selection.
*/
get() {
return this.multi
? this.selection.slice()
: this.selection[0];
}
/**
* Clears all the selection except the ones indicated.
*
* @method clear
* @param {Array} excludes items to be excluded.
*/
clear(excludes) {
this.selection.slice().forEach(function (item) {
if (!excludes || excludes.indexOf(item) < 0) {
this.setItemSelected(item, false);
}
}, this);
}
/**
* Indicates if a given item is selected.
*
* @method isSelected
* @param {*} item The item whose selection state should be checked.
* @returns Returns true if `item` is selected.
*/
isSelected(item) {
return this.selection.indexOf(item) >= 0;
}
/**
* Sets the selection state for a given item to either selected or deselected.
*
* @method setItemSelected
* @param {*} item The item to select.
* @param {boolean} isSelected True for selected, false for deselected.
*/
setItemSelected(item, isSelected) {
if (item != null) {
if (isSelected !== this.isSelected(item)) {
// proceed to update selection only if requested state differs from current
if (isSelected) {
this.selection.push(item);
} else {
const i = this.selection.indexOf(item);
if (i >= 0) {
this.selection.splice(i, 1);
}
}
if (this.selectCallback) {
this.selectCallback(item, isSelected);
}
}
}
}
select(item) {
if (this.multi) {
this.toggle(item);
} else if (this.get() !== item) {
this.setItemSelected(this.get(), false);
this.setItemSelected(item, true);
}
}
toggle(item) {
this.setItemSelected(item, !this.isSelected(item));
}
}