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import { NgbDropdown, NgbDropdownConfig } from '@ng-bootstrap/ng-bootstrap';
import { ThemeVariantName } from '../shared/theme';
import { projectContent } from '../shared/utility/projection.utility';
import { WvrBaseComponent } from '../shared/wvr-base.component';
/**
* A dropdown with button and contextualized styling.
*/
@Component({
selector: 'wvr-dropdown-component',
templateUrl: './wvr-dropdown.component.html',
styleUrls: ['./wvr-dropdown.component.scss'],
changeDetection: ChangeDetectionStrategy.Default
})
export class WvrDropdownComponent extends WvrBaseComponent implements AfterViewInit {
/** Sets asside a reference to the NgbDropdown element. */
@ViewChild(NgbDropdown) dropdown: NgbDropdown;
/** Binds the value of the animationspeed in seconds to the css variable `--wvr-dropdown-menu-animation-speed` */
@HostBinding('style.--wvr-dropdown-menu-animation-speed') animationSpeedSeconds;
/**
* This establishes a delay in milliseconds before the dropdown is displayed.
*
* Do not set this too low as there may be problems with the focusIn and click events (click event may trigger or be triggered by a focusIn).
*/
@Input() openDelay = 150;
private _openDelayTimer: NodeJS.Timeout;
/** A setter which sets the speed to `_animationSpeedSeconds` in seconds. */
@Input() set menuAnimationSpeed(speed: number) {
this.animationSpeedSeconds = `${speed / 1000}s`;
}
/** Allows for override of button background value. */
@Input() btnBackground: string;
/** Allows for override of button background value in active state. */
@Input() btnBackgroundActive: string;
/** Allows for override of button background value in hover state. */
@Input() btnBackgroundHover: string;
/** Allows for override of button border value in active state. */
@Input() btnBorderActive: string;
/** Allows for override of button border color. */
@Input() btnBorderColor: string;
/** Allows for override of button border value in focus state. */
@Input() btnBorderFocus: string;
/** Allows for override of button border value in hover state. */
@Input() btnBorderHover: string;
/** Allows for override the button color. */
@Input() btnColor: string;
/** Allows for override the button color in active state. */
@Input() btnColorActive: string;
/** Allows for override the button color in hover state. */
@Input() btnColorHover: string;
/** Allows for override the button radius. */
@Input() btnBorderRadius: string;
/** Allows for override the button box shadow in focus state. */
@Input() btnBoxShadowFocus: string;
/** Allows for override the button cursor. */
@Input() btnCursor: string;
/** Allows for override the button font family. */
@Input() btnFontFamily: string;
/** Allows for override the button font size. */
@Input() btnFontSize: string;
/** Allows for override the button font weight. */
@Input() btnFontWeight: string;
/** Allows for override the button line height. */
@Input() btnLineHeight: string;
/** Allows for override the button line height. */
@Input() btnPadding: string;
/** Allows for override the button line height. */
@Input() btnTextAlign: string;
/** Allows for override the button type. */
@Input() btnType: string;
/** Allows for override the button line height. */
@Input() btnVerticalAlign: string;
/** Allows for override of button href value. */
@Input() btnHref = '';
/** Allows for override of button size. */
@Input() btnSize = '';
/** Allows for the visual customization of the dropdown menu activation button. */
@Input() themeVariant: ThemeVariantName = 'secondary';
/** Binds the input from `menuBackground` to the css variable `--wvr-dropdown-menu-background` */
@Input() menuThemeVariant: ThemeVariantName;
/** Allows for override of role value (such as setting role="menu"). */
@Input() role: string;
/** Binds the input from `menu-border` to the css variable `--wvr-dropdown-menu-border` */
@HostBinding('style.--wvr-dropdown-menu-border') @Input() menuBorder;
/** Binds the input from `menu-border-radius` to the css variable `--wvr-dropdown-menu-border-radius` */
@HostBinding('style.--wvr-dropdown-menu-border-radius') @Input() menuBorderRadius;
/** Binds the input from `menu-border-display` to the css variable `--wvr-dropdown-menu-display` */
@HostBinding('style.--wvr-dropdown-menu-display') @Input() menuBorderDisplay;
/** Binds the input from `menu-border-flexDirection` to the css variable `--wvr-dropdown-menu-flex-direction` */
@HostBinding('style.--wvr-dropdown-menu-flex-direction') @Input() menuFlexDirection;
/** Binds the input from `menu-padding` to the css variable `--wvr-dropdown-menu-padding` */
@HostBinding('style.--wvr-dropdown-menu-padding') @Input() menuPadding;
/** Binds the input from `menu-width` to the css variable `--wvr-dropdown-menu-width` */
@HostBinding('style.--wvr-dropdown-menu-width') @Input() menuWidth;
/**
* Binds the input from `menu-x-offset` to the css variable `--wvr-dropdown-x-offset`.
* This css variable is applied by `left` css rule to the menu.
*/
@HostBinding('style.--wvr-dropdown-menu-x-offset') @Input() menuXOffset;
/**
* Binds the input from `menu-y-offset` to the css variable `--wvr-dropdown-y-offset`.
* This css variable is applied by `margin-top` css rule to the menu.
*/
@HostBinding('style.--wvr-dropdown-menu-y-offset') @Input() menuYOffset;
/**
* Binds the input from `item-margin` to the css variable `--wvr-dropdown-item-margin`.
* This css variable is applied by both the `[wvre-dropdown-menu-item]` and the `wvre-dropdown-menu-item`
* css rules to each item passed to the the dropdown menu.
*/
@HostBinding('style.--wvr-dropdown-menu-item-margin') @Input() menuItemMargin;
/** Configures the event type which will activate the dropdown menu. */
@Input() toggleOn: 'click' | 'mouseover' = 'click';
/** Allows for override the button text decoration. */
private _btnTextDecoration: string;
@Input() set btnTextDecoration(value: string) {
this._btnTextDecoration = value;
}
get btnTextDecoration(): string {
return this._btnTextDecoration ?
this._btnTextDecoration :
`var(--wvr-btn-${this.themeVariant}-text-decoration-default)`;
}
/** Allows for override the button text decoration. */
private _btnTextDecorationActive: string;
@Input() set btnTextDecorationActive(value: string) {
this._btnTextDecorationActive = value;
}
get btnTextDecorationActive(): string {
return this._btnTextDecorationActive ?
this._btnTextDecorationActive :
`var(--wvr-btn-${this.themeVariant}-active-text-decoration-default)`;
}
// text-decoration-focus
private _btnTextDecorationFocus: string;
@Input() set btnTextDecorationFocus(value: string) {
this._btnTextDecorationFocus = value;
}
get btnTextDecorationFocus(): string {
return this._btnTextDecorationFocus ?
this._btnTextDecorationFocus :
`var(--wvr-btn-${this.themeVariant}-focus-text-decoration-default)`;
}
private _btnTextDecorationHover: string;
@Input() set btnTextDecorationHover(value: string) {
this._btnTextDecorationHover = value;
}
get btnTextDecorationHover(): string {
return this._btnTextDecorationHover ?
this._btnTextDecorationHover :
`var(--wvr-btn-${this.themeVariant}-hover-text-decoration-default)`;
}
@Input() placement = 'top-right';
/**
* A public access reference to the open/closed state of the dropdown menu. Used for
* animations;
*/
open = false;
/**
* A state used to represent that focus is on or within the element.
* Used for button navigation decisions.
*/
focus = false;
/**
* Designate that a close has been requested.
*
* Used to inform that the popup should be closed while the popup is still in the process of opening up.
*/
private requestClose = false;
@Input() dropdownMenuDisplay = 'dynamic';
constructor(injector: Injector, config: NgbDropdownConfig) {
super(injector);
config.autoClose = false;
}
/** Called after the view has been intialized. Handles the rendering of the projected content. */
ngAfterViewInit(): void {
projectContent(this.eRef, 'template[dropdown-button]', 'span[button-content]');
projectContent(this.eRef, 'template[dropdown-menu]', 'div[dropdown-menu]');
}
/** An access method to expose the `isOpen` utility method from `NgbDropdown` */
isOpen(): boolean {
return this.dropdown ? this.dropdown.isOpen() : false;
}
/**
* A handler method for the `focus` event.
*/
@HostListener('focusin', ['$event']) focusIn($event: Event): void {
if (this.eRef.nativeElement.contains($event.target)) {
if (!this.focus) {
$event.stopPropagation();
$event.preventDefault();
this.giveFocus();
}
} else {
this.takeFocus();
}
}
/**
* A handler method for the `focus` event.
*
* The 'relatedTarget' may be null if the focus lost is due to the focus leaving the web browser itself rather than the element within the page.
* In this case, do not remove focus because the what goes on outside of the page should not affect what goes inside the page.
*/
@HostListener('focusout', ['$event']) focusOut($event: Event): void {
if ($event['relatedTarget'] !== null) {
if (!this.eRef.nativeElement.contains($event['relatedTarget'])) {
this.takeFocus();
}
}
}
/**
* A handler method for the `mouseenter` event.
*
* Opens the dropdown if `toggleOn` is set to `mouseover`.
*/
@HostListener('mouseenter', ['$event']) hoverOpen($event: Event): void {
Eif (this.toggleOn === 'mouseover') {
this.giveFocus();
}
}
/**
* A handler method for the `mouseleave` event.
*
* Closes the dropdown if `toggleOn` is set to `mouseover`.
*/
@HostListener('mouseleave', ['$event']) hoverClose($event: Event): void {
Eif (this.toggleOn === 'mouseover') {
this.takeFocus();
}
}
/**
* A handler method for the `document:mousedown` event.
*
* Closes the dropdown if `toggleOn` is set to `click`
* And the click occured off of the wvre-dropdown component.
*
* The event.button == 0 is the left click or the un-initialized state.
*
* The 'mousedown' is used instead of 'click' to avoid bubbling problems.
* The 'click' does not happen before 'focusin' and there is a race condition between the two.
* When 'mousedown' is used, it happens before 'focusin' and the bubbling can be blocked to avoid a race condition.
*/
@HostListener('document:mousedown', ['$event']) documentClick($event: MouseEvent): void {
if ($event.button == 0) {
const dropDownButton = this.eRef.nativeElement.querySelector(".wvr-dropdown > div > wvr-button-component");
if (!!dropDownButton && !!dropDownButton.nativeElement && !!$event.target) {
if (dropDownButton.nativeElement.contains($event.target)) {
if (this.toggleOn === 'click') {
$event.stopPropagation();
$event.preventDefault();
if (this.isOpen()) {
this.takeFocus();
} else {
this.giveFocus();
}
}
} else {
this.takeFocus();
}
}
}
}
/**
* A single handler method for when the any key is down while associated with the host element.
*/
@HostListener('keydown', ['$event']) keyDown($event): void {
const lowerKey = $event.key.toLowerCase();
if (lowerKey == "escape") {
if (this.isOpen()) {
const list = this.eRef.nativeElement.querySelector('.dropdown-menu > *');
$event.stopPropagation();
$event.preventDefault();
if (!!list && list.contains($event.target)) {
this.focusToToggle();
} else {
this.takeFocus();
}
}
}
else if (lowerKey == "space") {
const list = this.eRef.nativeElement.querySelector('.dropdown-menu > *');
if (!!list && list.contains($event.target)) {
// @todo
} else {
$event.stopPropagation();
$event.preventDefault();
if (this.isOpen()) {
this.takeFocus();
} else {
this.giveFocus();
}
}
}
else if (lowerKey == "arrowup" || lowerKey == "arrowdown") {
const list = this.eRef.nativeElement.querySelector('.dropdown-menu > *');
if (!!list) {
const up = lowerKey == "arrowup";
$event.stopPropagation();
$event.preventDefault();
if (list.contains($event.target)) {
let focused = list.children.length;
for (let i = 0; i < list.children.length; i++) {
if ($event.target == list.children[i]) {
focused = i;
}
}
this.focusToChild(focused, up, list);
}
else if (list.children.length > 0) {
const focused = up ? list.children.length - 1 : -1;
this.focusToChild(focused, up, list);
}
}
}
}
/** Change focus to the drop down toggle that exists outside of the drop down list. */
private focusToToggle() {
const dropdown = this.eRef.nativeElement.querySelector('.dropdown .dropdown-toggle .wvr-button');
if (!!dropdown) {
dropdown.focus();
}
}
/** Change focus to a non-disabled child based on the current focused position within the list. */
private focusToChild(focused: number, up: boolean, list: any): void {
if (focused == list.children.length || up && focused == 0 || !up && focused == list.children.length) {
this.focusToToggle();
} else {
let i = up ? focused - 1 : focused + 1;
// Select the first non-disabled child.
if (up) {
for (; i >= 0; i--) {
if (!list.children[i].hasAttribute('disabled')) {
break;
}
// There is no available child to move to, so set out of range.
if (i == 0) {
i = list.children.length;
break;
}
}
} else {
for (; i < list.children.length; i++) {
if (!list.children[i].hasAttribute('disabled')) {
break;
}
}
}
if (i == list.children.length) {
this.focusToToggle();
} else {
list.children[i].focus();
}
}
}
/**
* If focus is not set, then set focus.
*
* Does open dropdown, if it is closed and not already in the process of opening.
*/
private giveFocus(): void {
Eif (!this._openDelayTimer && !this.focus) {
this.focus = true;
this.requestClose = false;
this._openDelayTimer = setTimeout(() => {
Eif (this.focus) {
Eif (!this.requestClose && !this.isMobileLayout) {
this.open = true;
this.dropdown.open();
}
this._openDelayTimer = undefined;
}
this.requestClose = false;
}, this.openDelay);
}
};
/**
* If focus is set, then unset focus.
*
* Does close dropdown, if it is open.
*/
private takeFocus(): void {
Iif (!!this._openDelayTimer) {
this.requestClose = true;
} else Iif (this.focus) {
this.focus = false;
if (this.isOpen()) {
this.open = false;
this.dropdown.close();
}
}
};
}
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