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import {
autoResize,
createControlAndTargetContract,
handleSlotChangeWithState,
normalizeBoolean,
getOverflowContainer,
closePopover,
openPopover,
togglePopover,
normalizeInput,
oneOf,
} from 'sds/utils';
import 'sds/privateThemeProvider';
export default class DropdownManager extends LightningElement {
static shadowSupportMode = 'native';
_container;
_trigger;
_slottedChildren;
_ariaHasPopup;
/**
* The popover is powered by this object. The object standardizes the
* popover interface which allows us to interact with our libraries to
* assemble and update the popover.
*
* @type {Object}
* @property {LightningElement} component - the component instance
* @property {HTMLElement} control - the control element that triggers the target
* @property {HTMLElement} target - the target element to be positioned by the control
* @property {String} placement - the placement of the target relative to the control
* @property {Number} offset - the offset amount of the target from the control
* @property {Boolean} autoResize - if true, the target will resize to fit the control
* @property {Function} observeResize - a function that cleans up the observer
*/
_popover = {
component: this,
control: null,
target: null,
placement: 'block-start',
offset: null,
autoResize: false,
observeResize: null,
};
/**
* Get all slotted children.
*
* @returns {Array}
*/
get slotChildren() {
return this._slottedChildren;
}
set slotChildren(value) {
if (!Array.isArray(value)) {
console.warn(`slotChildren must be an array. Received ${typeof value}.`);
return;
}
this._slottedChildren = value;
}
get popover() {
return this._popover;
}
set popover(value) {
this._popover[value] = value;
}
/**
* Get the control element that triggers the target.
*
* @returns {HTMLElement}
*/
get control() {
return this.popover.control;
}
set control(value) {
this.popover.control = value;
}
/**
* Get the target element to be positioned by the control.
*
* @Ireturns {HTMLElement}
*/
get target() {
return this.popover.target;
}
set target(value) {
this.popover.target = value;
}
/**
* Get the closest containing element with overflow or default to the viewport.
*
* @returns {HTMLElement}
*/
get container() {
return this._container;
}
set container(value) {
this._container = value;
}
/**
* Sets the placement of the target relative to the control. Placement
* validation checked in position library.
*
* @returns {String}
*/
@api
get placement() {
return this.popover.placement;
}
set placement(value) {
this.popover.placement = value;
}
/**
* Sets the offset amount of the target from the control.
*
* @returns {Number}
*/
@api
get offset() {
return this.popover.offset;
}
set offset(value) {
const numberValue = Number(value);
if (typeof numberValue === 'number') {
this.popover.offset = numberValue;
} else {
console.warn(`offset must be a valid number. Received ${value}.`);
}
}
/**
* If true, the target will resize to fit the control.
*
* @returns {Boolean}
*/
@api
get autoResize() {
return this.popover.autoResize;
}
set autoResize(value) {
this.popover.autoResize = normalizeBoolean(value);
}
/**
* Sets the ariaHasPopup value
*
* @returns {String} Enum
*/
@api
get ariaHasPopup() {
return this._ariaHasPopup;
}
set ariaHasPopup(value) {
this._ariaHasPopup = normalizeInput(value);
oneOf(this._ariaHasPopup, ['dialog', 'menu', 'listbox', 'tree', 'grid']);
}
/**
* Observe resizing of the target and reposition the target when it does.
*
* @returns {Function} - a function that cleans up the observer
*/
get observeResize() {
return this.popover.observeResize;
}
set observeResize(value) {
this.popover.observeResize = value;
}
/**
* The trigger type for the target. Valid values are 'click' and 'hover'.
*
* @returns {String} - the trigger type
*/
@api
get trigger() {
return this._trigger;
}
set trigger(value) {
const validValues = ['click', 'hover'];
if (
validValues.includes(value)
? (this._trigger = value)
: console.warn(`Trigger must be one of ${validValues}. Received ${value}.`)
);
}
/**
* Open the target. Method of opening depends on the brower's support for
* the popover API. setSize() must be called before openPopover() so that
* the updated rendered layout is available for positioning.
*
* @public
*/
@api
open = () => {
this.setSize();
openPopover(this.popover);
};
/**
* Close the target. Method of closing depends on the brower's support
* for the popover API.
*
* @public
*/
@api
close = () => {
closePopover(this.popover);
};
/**
* Toggle the target between open and closed states. Method of toggling
* depends on the brower's support for the popover API.
*
* @public
*/
@api
toggleOpenClose = () => {
this.setSize();
togglePopover(this.popover);
};
/**
* Sets the size of the target. Currently used for autoResize exclusively but
* expandable to other sizing use cases.
*
* @public
*/
@api
setSize = () => {
autoResize(this.popover);
}E;
/**
* Sets Iany required attributes not covered by other areas.
*/
setAttributes = () => {
/**
* We need to manually set the popover attribute to precisely control
* the position and dimensions. Also, we set the attribute and not the
* property because browser's that don't support the popover API won't
* reflect the attribute.
*/
this.target.setAttribute('popover', 'manual');
if (this._ariaHasPopup) {
this.control.setAttribute('aria-haspopup', this._ariaHasPopup);
}
};
/**
* Event handler for the open event. Opens the target if it's closed.
* This is primarily an abstraction for the event listener.
*/
handleOpenEvent = () => {
this.open();
};
/**
* Event handler for the close event. Closes the target if it's open.
* This is primarily an abstraction for the event listener.
*/
handleCloseEvent = () => {
this.close();
};
/**
* Event handler for keydown events, closes the target if the escape key is pressed.
*
* @param {Event} e
*/
handleKeydownEvent = (e) => {
if (e.key === 'Escape') {
this.close();
}
if (e.key === 'Enter' || e.key === ' ') {
e.stopPropagation();
e.preventDefault();
this.toggleOpenClose();
}
};
/**
* Event handler for toggling the target between open and closed states.
*
* @param {Event} e - event object
*/
handleToggleEvent = (e) => {
e.stopPropagation();
this.toggleOpenClose();
};
/**
* Bespoke setup details for the component. Typically runs after a slot change.
*/
setup = () => {
/**
* We find our container and wire up the attributes.
*/
this.container = getOverflowContainer(this.template.host);
this.setAttributes();
};
/**
* Event Listeners
*
* Wire up our interactions. These are called within the slot change
* handler depending on the render state.
*
* @TODO: Make hover logic smarter so we can introduce offset.
*/
getHoverEventListeners = () => [
{ target: document, type: 'keydown', handler: this.handleKeydownEvent },
{ target: this, type: 'mouseover', handler: this.handleOpenEvent },
{ target: this, type: 'mouseout', handler: this.handleCloseEvent },
{ target: this.control, type: 'focus', handler: this.handleOpenEvent },
{ target: this.control, type: 'blur', handler: this.handleCloseEvent },
];
getClickEventListeners = () => [
{ target: document, type: 'keydown', handler: this.handleKeydownEvent },
{ target: this.container, type: 'scroll', handler: this.handleCloseEvent },
{ target: this.container, type: 'click', handler: this.handleCloseEvent },
{ target: this.control, type: 'click', handler: this.handleToggleEvent },
{ target: this.control, type: 'keydown', handler: this.handleKeydownEvent },
{ target: this.target, type: 'click', handler: (e) => e.stopPropagation() },
{ target: this, type: 'close', handler: this.handleCloseEvent },
];
getEventType(type) {
return type === 'click' ? this.getClickEventListeners() : this.getHoverEventListeners();
}
attachEventListeners = () => {
this.getEventType(this.trigger).forEach(({ target, type, handler }) => {
target.addEventListener(type, handler);
});
};
destroyEventListeners = () => {
this.getEventType(this.trigger).forEach(({ target, type, handler }) => {
target.removeEventListener(type, handler);
});
};
/**
* Slot Change Handler /w State
*
* This is the main entry point for the component since this manager is entirely
* reliant on slot content. It's called whenever the slot changes.
*/
handleSlotChange = handleSlotChangeWithState((state) => {
if (state.changed) {
this.slotChildren = state.newContent;
}
if (state.changed && !state.empty) {
/**
* If we have slot children, we can automatically create the control and
* target contract and get to work below.
*/
createControlAndTargetContract({
element: this,
content: this.slotChildren,
callback: () => {
/**
* All the heavy lifting is done at this point, now we just need to
* do a little minor setup unique to the component.
*/
this.setup();
/**
* Manage our event listeners depending on the render state.
*/
if (state.firstRender) {
this.attachEventListeners();
}
if (!state.firstRender) {
this.destroyEventListeners();
this.attachEventListeners();
}
},
});
} else {
console.error(
'No slot children found. Please add an element with an ID and a button or input with the aria-controls attribute set to the ID.',
);
}
});
}
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