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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
AfterViewChecked,
AfterViewInit,
Component,
ElementRef,
EventEmitter,
Input,
Output,
TemplateRef,
ViewChild,
} from '@angular/core';
import { ActionEvent, HasFocusEvent } from '../utils/event.types';
import { isNotEmpty, isUndefOrEmpty } from '../utils/internal-utils';
import { FocusableElementOwner, Item } from '../utils/util.types';
import { TooltipComponent } from '../internal/tooltip/tooltip.component';
export type ButtonContentDisplay =
| 'icon-only'
| 'icon-only-circle'
| 'icon-left'
| 'icon-right'
| 'text-only'
| 'status';
const ARMED_EMULATION = 'gc-input-active';
/**
* A Button element that allows users to fire an action on a button press.
*/
@Component({
selector: 'gc-button',
templateUrl: './button.component.html',
styleUrls: ['./button.component.css'],
host: {
// host element generates an extra text node, which causes Firefox + Jaws to read out the button
// text twice when it's used in a list -> remove it from the a11y tree
role: 'none',
},
})
export class ButtonComponent<MenuItem extends Item = Item>
implements AfterViewInit, AfterViewChecked, FocusableElementOwner
{
/**
* The label that shows on the button.
*/
@Input()
public label = '';
/**
* The visual type of the button.
*/
@Input()
public variant: 'primary' | 'secondary' | 'tertiary' = 'primary';
/**
* Define how the content is displayed
* - icon-only: only the icon is shown
* - icon-only-circle: only the icon is shown in a circular shape
* - icon-left: icon is shown on the left of the text
* - icon-right: icon is shown on the right of the text
* - text-only: only text is displayed
* - status: only the icon is shown but using the width of the label
*/
@Input()
public contentDisplay: ButtonContentDisplay = 'text-only';
/**
* Text displayed as a tooltip to the user
*/
@Input()
public tooltipText?: string;
/**
* @ignore
*/
@Input()
public _classes = '';
/**
* @ignore
*/
@Input()
public _supportLiveTextChange = false;
/**
* Automatically focus the control if it is contained in an area tagged with data-gc-auto-focus-area
*/
@Input()
public autoFocus = false;
/**
* If not empty, the button will open a menu on click and render these as items of the menu.
*/
@Input()
public menuItems: readonly MenuItem[] = [];
/**
* Decides on which side of the menu button the menu is going to appear.
*/
@Input()
public menuAlignment: 'start' | 'end' | 'auto' = 'end';
/** Optional icon provider to use for menu-items */
@Input()
public menuItemIconProvider?: TemplateRef<unknown>;
/**
* Menu items that should be disabled in the menu.
*/
@Input()
public disabledMenuItems: ReadonlySet<string> = new Set();
/**
* @ignore
* Overrides the default tabindex value.
*/
@Input()
public _tabIndexOverride?: number;
/**
* Event which is fired when an menu item is activated.
*/
@Output()
public readonly onMenuAction: EventEmitter<MenuItem> =
new EventEmitter<MenuItem>();
/**
* The method that gets fired when the button is pressed.
*/
@Output()
public readonly onAction: EventEmitter<ActionEvent> =
new EventEmitter<ActionEvent>();
/**
* @ignore
*/
@Output()
public readonly _onHasFocus: EventEmitter<HasFocusEvent> =
new EventEmitter<HasFocusEvent>();
/** @ignore */
@ViewChild('button')
private button!: ElementRef<HTMLButtonElement>;
/** @ignore */
@ViewChild('tooltip')
private tooltip?: TooltipComponent;
/**
* If set to true the button state is set to disabled which means that it is no longer clickable.
*/
@Input()
public get disabled(): boolean {
return this._disabled;
}
public set disabled(value: boolean) {
this._disabled = value;
}
/**
* @ignore
*/
public hasFocus = false;
/**
* @ignore
*/
private _disabled = false;
focusChild(): boolean {
if (!this.disabled) {
this.button.nativeElement.focus();
return true;
}
return false;
}
/** @ignore */
ngAfterViewInit(): void {
if (
this.tooltip !== undefined &&
this.tooltip.tooltipOwner !== this.button
) {
this.tooltip.tooltipOwner = this.button;
}
}
/** @ignore */
ngAfterViewChecked(): void {
this.ngAfterViewInit();
}
/** @ignore */
_handleOnClick(event: MouseEvent): void {
this.onAction.emit({
ctrlKey: event.ctrlKey,
metaKey: event.metaKey,
shiftKey: event.shiftKey,
});
}
/**
* @ignore
* @deprecated use moveFocus
*/
_focus(): void {
this.button.nativeElement.focus();
}
/** @ignore */
_onKeyDown(event: KeyboardEvent): void {
// We need to emulate the armed state for FF
if (event.key == ' ') {
// only emulate for space - ENTER executes the action on key-down already and so native buttons also do not show that
(event.currentTarget as HTMLButtonElement).classList.add(ARMED_EMULATION);
}
}
/** @ignore */
_onKeyUp(event: KeyboardEvent): void {
if (event.key == ' ') {
// only emulate for space - ENTER executes the action on key-down already and so native buttons also do not show that
(event.currentTarget as HTMLButtonElement).classList.remove(
ARMED_EMULATION,
);
}
}
/** @ignore */
_onFocus(): void {
this.hasFocus = true;
this.refreshAriaLive();
this._onHasFocus.emit({ hasFocus: true });
}
/** @ignore */
_onBlur(): void {
this.hasFocus = false;
this.refreshAriaLive();
this.button.nativeElement.classList.remove(ARMED_EMULATION); // Safe guard to clean up if the key-up is not received
this._onHasFocus.emit({ hasFocus: false });
}
/** @ignore */
_hasGraphicTooltip(): boolean {
if (!this.contentDisplay.includes('icon-only')) {
return false;
}
return isUndefOrEmpty(this.tooltipText) && isNotEmpty(this.label);
}
/** @ignore */
_hideTooltip(): void {
this.tooltip?.hide();
}
/** @ignore */
private refreshAriaLive() {
// directly interface with the element befor the other DOM-Syncs happen
const el = this.button.nativeElement;
if (this._supportLiveTextChange && !this.disabled && this.hasFocus) {
el.setAttribute('aria-live', 'polite');
} else {
el.removeAttribute('aria-live');
}
}
}
|