lazy-widgets/dist/widgets/Button.js

Typescript retained mode GUI for the HTML canvas API

import { ButtonClickHelper } from '../helpers/ButtonClickHelper.js';
import { BaseContainer } from './BaseContainer.js';
import { PropagationModel } from '../events/WidgetEvent.js';
import { SingleParentXMLInputConfig } from '../xml/SingleParentXMLInputConfig.js';
import { ClickEvent } from '../events/ClickEvent.js';
import { FocusEvent } from '../events/FocusEvent.js';
import { BlurEvent } from '../events/BlurEvent.js';
import { PointerEvent } from '../events/PointerEvent.js';
import { LeaveEvent } from '../events/LeaveEvent.js';
/**
 * A {@link BaseContainer} which can be {@link ClickHelper | clicked} as a
 * button. Since the button grabs all events, no events are propagated to the
 * child.
 *
 * Can be constrained to a specific type of children.
 *
 * @category Widget
 */
export class Button extends BaseContainer {
    constructor(child, properties) {
        var _a;
        super(child, properties);
        this._clickable = (_a = properties === null || properties === void 0 ? void 0 : properties.clickable) !== null && _a !== void 0 ? _a : true;
        this.clickHelper = new ButtonClickHelper(this);
        this.tabFocusable = true;
    }
    /**
     * Click the button. If the button is {@link Button#clickable}, then a
     * {@link ClickEvent} will be fired.
     */
    click() {
        this.dispatchEvent(new ClickEvent(this));
    }
    activate() {
        super.activate();
        this.clickHelper.reset();
    }
    deactivate() {
        super.deactivate();
        this.clickHelper.reset();
    }
    handleEvent(event) {
        if (event.propagation !== PropagationModel.Trickling) {
            if (event.isa(FocusEvent)) {
                this.clickHelper.onFocusGrabbed(event.focusType);
                return this;
            }
            else if (event.isa(BlurEvent)) {
                this.clickHelper.onFocusDropped(event.focusType);
                return this;
            }
            else {
                return super.handleEvent(event);
            }
        }
        const tricklingEvent = event;
        if (tricklingEvent.target !== this) {
            const superCapture = super.handleEvent(event);
            if (superCapture) {
                if (event instanceof PointerEvent) {
                    // XXX simulate an unhover, since the pointer is over some
                    //     nested button now
                    this.clickHelper.handleEvent(new LeaveEvent(this), this.root, this._clickable, this.bounds);
                }
                return superCapture;
            }
            if (tricklingEvent.target !== null) {
                return null;
            }
        }
        const [wasClick, capture] = this.clickHelper.handleEvent(tricklingEvent, this.root, this._clickable, this.bounds);
        if (wasClick) {
            this.click();
        }
        return capture ? this : null;
    }
    handlePreLayoutUpdate() {
        super.handlePreLayoutUpdate();
        this.clickHelper.doneProcessing();
    }
    /**
     * Is the button clickable? True by default. Used for disabling the button
     * without hiding it.
     */
    get clickable() {
        return this._clickable;
    }
    set clickable(clickable) {
        if (this._clickable === clickable) {
            return;
        }
        this._clickable = clickable;
        this.clickHelper.reset();
        this.markWholeAsDirty();
    }
}
Button.autoXML = {
    name: 'button',
    inputConfig: SingleParentXMLInputConfig
};
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