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/**
* @license
* Copyright (c) 2016 - 2023 Vaadin Ltd.
* This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
*/
import { addListener } from '@vaadin/component-base/src/gestures.js';
/**
* A mixin that provides basic functionality for the
* ``. This includes properties, cell rendering,
* and overridable methods for handling changes to the selection state.
*
* **NOTE**: This mixin is re-used by the Flow component, and as such must not
* implement any selection state updates for the column element or the grid.
* Web component-specific selection state updates must be implemented in the
* `` itself, by overriding the protected methods
* provided by this mixin.
*
* @polymerMixin
*/
export const GridSelectionColumnBaseMixin = (superClass) =>
class GridSelectionColumnBaseMixin extends superClass {
static get properties() {
return {
/**
* Width of the cells for this column.
*/
width: {
type: String,
value: '58px',
sync: true,
},
/**
* Flex grow ratio for the cell widths. When set to 0, cell width is fixed.
* @attr {number} flex-grow
* @type {number}
*/
flexGrow: {
type: Number,
value: 0,
sync: true,
},
/**
* When true, all the items are selected.
* @attr {boolean} select-all
* @type {boolean}
*/
selectAll: {
type: Boolean,
value: false,
notify: true,
sync: true,
},
/**
* When true, the active gets automatically selected.
* @attr {boolean} auto-select
* @type {boolean}
*/
autoSelect: {
type: Boolean,
value: false,
sync: true,
},
/**
* When true, rows can be selected by dragging over the selection column.
* @attr {boolean} drag-select
* @type {boolean}
*/
dragSelect: {
type: Boolean,
value: false,
sync: true,
},
/** @protected */
_indeterminate: {
type: Boolean,
sync: true,
},
/** @protected */
_selectAllHidden: Boolean,
};
}
static get observers() {
return [
'_onHeaderRendererOrBindingChanged(_headerRenderer, _headerCell, path, header, selectAll, _indeterminate, _selectAllHidden)',
];
}
/**
* Renders the Select All checkbox to the header cell.
*
* @override
*/
_defaultHeaderRenderer(root, _column) {
let checkbox = root.firstElementChild;
if (!checkbox) {
checkbox = document.createElement('vaadin-checkbox');
checkbox.setAttribute('aria-label', 'Select All');
checkbox.classList.add('vaadin-grid-select-all-checkbox');
root.appendChild(checkbox);
// Add listener after appending, so we can skip the initial change event
checkbox.addEventListener('checked-changed', this.__onSelectAllCheckedChanged.bind(this));
}
const checked = this.__isChecked(this.selectAll, this._indeterminate);
checkbox.__rendererChecked = checked;
checkbox.checked = checked;
checkbox.hidden = this._selectAllHidden;
checkbox.indeterminate = this._indeterminate;
}
/**
* Renders the Select Row checkbox to the body cell.
*
* @override
*/
_defaultRenderer(root, _column, { item, selected }) {
let checkbox = root.firstElementChild;
if (!checkbox) {
checkbox = document.createElement('vaadin-checkbox');
checkbox.setAttribute('aria-label', 'Select Row');
root.appendChild(checkbox);
// Add listener after appending, so we can skip the initial change event
checkbox.addEventListener('checked-changed', this.__onSelectRowCheckedChanged.bind(this));
addListener(root, 'track', this.__onCellTrack.bind(this));
root.addEventListener('mousedown', this.__onCellMouseDown.bind(this));
root.addEventListener('click', this.__onCellClick.bind(this));
}
checkbox.__item = item;
checkbox.__rendererChecked = selected;
checkbox.checked = selected;
}
/**
* Updates the select all state when the Select All checkbox is switched.
* The listener handles only user-fired events.
*
* @private
*/
__onSelectAllCheckedChanged(e) {
// Skip if the state is changed by the renderer.
if (e.target.checked === e.target.__rendererChecked) {
return;
}
if (this._indeterminate || e.target.checked) {
this._selectAll();
} else {
this._deselectAll();
}
}
/**
* Selects or deselects the row when the Select Row checkbox is switched.
* The listener handles only user-fired events.
*
* @private
*/
__onSelectRowCheckedChanged(e) {
// Skip if the state is changed by the renderer.
if (e.target.checked === e.target.__rendererChecked) {
return;
}
if (e.target.checked) {
this._selectItem(e.target.__item);
} else {
this._deselectItem(e.target.__item);
}
}
/** @private */
__onCellTrack(event) {
if (!this.dragSelect) {
return;
}
this.__dragCurrentY = event.detail.y;
this.__dragDy = event.detail.dy;
if (event.detail.state === 'start') {
const renderedRows = this._grid._getRenderedRows();
// Get the row where the drag started
const dragStartRow = renderedRows.find((row) => row.contains(event.currentTarget.assignedSlot));
// Whether to select or deselect the items on drag
this.__selectOnDrag = !this._grid._isSelected(dragStartRow._item);
// Store the index of the row where the drag started
this.__dragStartIndex = dragStartRow.index;
// Store the item of the row where the drag started
this.__dragStartItem = dragStartRow._item;
// Start the auto scroller
this.__dragAutoScroller();
} else if (event.detail.state === 'end') {
// if drag start and end stays within the same item, then toggle its state
if (this.__dragStartItem) {
if (this.__selectOnDrag) {
this._selectItem(this.__dragStartItem);
} else {
this._deselectItem(this.__dragStartItem);
}
}
// clear drag state after timeout, which allows preventing the
// subsequent click event if drag started and ended on the same item
setTimeout(() => {
this.__dragStartIndex = undefined;
});
}
}
/** @private */
__onCellMouseDown(e) {
if (this.dragSelect) {
// Prevent text selection when starting to drag
e.preventDefault();
}
}
/** @private */
__onCellClick(e) {
if (this.__dragStartIndex !== undefined) {
// Stop the click event if drag was enabled. This click event should
// only occur if drag started and stopped on the same item. In that case
// the selection state has already been toggled on drag end, and we
// don't want to toggle it again from clicking the checkbox or changing
// the active item.
e.preventDefault();
}
}
/** @private */
_onCellKeyDown(e) {
const target = e.composedPath()[0];
// Toggle on Space without having to enter interaction mode first
if (e.keyCode === 32 && (target === this._headerCell || (this._cells.includes(target) && !this.autoSelect))) {
const checkbox = target._content.firstElementChild;
checkbox.checked = !checkbox.checked;
}
}
/** @private */
__dragAutoScroller() {
if (this.__dragStartIndex === undefined) {
return;
}
// Get the row being hovered over
const renderedRows = this._grid._getRenderedRows();
const hoveredRow = renderedRows.find((row) => {
const rowRect = row.getBoundingClientRect();
return this.__dragCurrentY >= rowRect.top && this.__dragCurrentY <= rowRect.bottom;
});
// Get the index of the row being hovered over or the first/last
// visible row if hovering outside the grid
let hoveredIndex = hoveredRow ? hoveredRow.index : undefined;
const scrollableArea = this.__getScrollableArea();
if (this.__dragCurrentY < scrollableArea.top) {
hoveredIndex = this._grid._firstVisibleIndex;
} else if (this.__dragCurrentY > scrollableArea.bottom) {
hoveredIndex = this._grid._lastVisibleIndex;
}
if (hoveredIndex !== undefined) {
// Select all items between the start and the current row
renderedRows.forEach((row) => {
if (
(hoveredIndex > this.__dragStartIndex && row.index >= this.__dragStartIndex && row.index <= hoveredIndex) ||
(hoveredIndex < this.__dragStartIndex && row.index <= this.__dragStartIndex && row.index >= hoveredIndex)
) {
if (this.__selectOnDrag) {
this._selectItem(row._item);
} else {
this._deselectItem(row._item);
}
this.__dragStartItem = undefined;
}
});
}
// Start scrolling in the top/bottom 15% of the scrollable area
const scrollTriggerArea = scrollableArea.height * 0.15;
// Maximum number of pixels to scroll per iteration
const maxScrollAmount = 10;
if (this.__dragDy < 0 && this.__dragCurrentY < scrollableArea.top + scrollTriggerArea) {
const dy = scrollableArea.top + scrollTriggerArea - this.__dragCurrentY;
const percentage = Math.min(1, dy / scrollTriggerArea);
this._grid.$.table.scrollTop -= percentage * maxScrollAmount;
}
if (this.__dragDy > 0 && this.__dragCurrentY > scrollableArea.bottom - scrollTriggerArea) {
const dy = this.__dragCurrentY - (scrollableArea.bottom - scrollTriggerArea);
const percentage = Math.min(1, dy / scrollTriggerArea);
this._grid.$.table.scrollTop += percentage * maxScrollAmount;
}
// Schedule the next auto scroll
setTimeout(() => this.__dragAutoScroller(), 10);
}
/**
* Gets the scrollable area of the grid as a bounding client rect. The
* scrollable area is the bounding rect of the grid minus the header and
* footer.
*
* @private
*/
__getScrollableArea() {
const gridRect = this._grid.$.table.getBoundingClientRect();
const headerRect = this._grid.$.header.getBoundingClientRect();
const footerRect = this._grid.$.footer.getBoundingClientRect();
return {
top: gridRect.top + headerRect.height,
bottom: gridRect.bottom - footerRect.height,
left: gridRect.left,
right: gridRect.right,
height: gridRect.height - headerRect.height - footerRect.height,
width: gridRect.width,
};
}
/**
* Override to handle the user selecting all items.
* @protected
*/
_selectAll() {}
/**
* Override to handle the user deselecting all items.
* @protected
*/
_deselectAll() {}
/**
* Override to handle the user selecting an item.
* @param {Object} item the item to select
* @protected
*/
_selectItem(item) {}
/**
* Override to handle the user deselecting an item.
* @param {Object} item the item to deselect
* @protected
*/
_deselectItem(item) {}
/**
* IOS needs indeterminate + checked at the same time
* @private
*/
__isChecked(selectAll, indeterminate) {
return indeterminate || selectAll;
}
};
