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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 | 2x 2x 3x 2x 10x 15x 2x 2x 10x 10x 3x 1x 2x 2x | import { CustomElementPropertyMetadata, CustomElementStateMetadata } from "../../../interfaces";
import { selectionChanged } from "../selectable/SelectableMixin";
/**
* Notifies the container when one of the selection in the children has changed
*/
const SelectionContainerMixin = Base =>
class SelectionContainer extends Base {
isSelectionContainer = true; // Mark the instance as a selection
static get properties(): Record<string, CustomElementPropertyMetadata> {
return {
/**
* Whether the component is selectable
*/
selectable: {
type: Boolean,
value: true,
reflect: true,
//inherit: true
},
/**
* Whether we can process multiple selection (false by default)
*/
multiple: {
type: Boolean,
reflect: true
},
/**
* The selected item or items. It is an attribute since it can be passed through a property initially
*/
selection: {
type: Array,
value: [],
mutable: true,
reflect: true
},
/**
* The handler to call when the selection has changed
*/
selectionChanged: {
attribute: 'selection-changed',
type: Function,
defer: true
}
};
}
static get state(): Record<string, CustomElementStateMetadata> {
return {
/**
* To track the current selected child for a single selection model
*/
selectedChild: {
value: undefined
}
};
}
constructor() {
super();
this.updateSelection = this.updateSelection.bind(this);
}
attributeChangedCallback(attributeName: string, oldValue: string, newValue: string) {
super.attributeChangedCallback?.(attributeName, oldValue, newValue);
if (attributeName === "selectable") {
if (newValue === "true" || newValue === "") {
this.addEventListener(selectionChanged, this.updateSelection);
}
else { // newValue === "false"
this.removeEventListener('selectionChanged', this.updateSelection);
}
}
}
updateSelection(event: CustomEvent) {
event.stopPropagation();
const {
multiple,
selection,
selectionChanged
} = this;
const {
element,
selected,
value
} = event.detail;
if (multiple !== undefined) {
if (selected === true) { // Add the value to the selection
this.selection = [...selection, value];
}
else { // Remove the value from the selection
this.selection = selection.filter(item => item.id !== value.id);
}
}
else { // Replace the old selection with the new one
const {
selectedChild
} = this;
// Deselect previous selected child
if (selectedChild !== undefined) {
selectedChild.selected = false;
}
this.selection.length = 0; // Clear the selection
if (selected === true) {
this.selection.push(value);
this.selectedChild = element;
}
else {
this.selectedChild = undefined;
}
}
if (selectionChanged !== undefined) {
selectionChanged(this.selection);
}
}
};
export default SelectionContainerMixin; |