ngx-bootstrap/buttons/esm2015/button-checkbox.directive.js

import { Directive, forwardRef, HostBinding, HostListener, Input } from '@angular/core';
import { NG_VALUE_ACCESSOR } from '@angular/forms';
// TODO: config: activeClass - Class to apply to the checked buttons
export const CHECKBOX_CONTROL_VALUE_ACCESSOR = {
    provide: NG_VALUE_ACCESSOR,
    useExisting: forwardRef(() => ButtonCheckboxDirective),
    multi: true
};
/**
 * Add checkbox functionality to any element
 */
export class ButtonCheckboxDirective {
    constructor() {
        /** Truthy value, will be set to ngModel */
        this.btnCheckboxTrue = true;
        /** Falsy value, will be set to ngModel */
        this.btnCheckboxFalse = false;
        this.state = false;
        this.isDisabled = false;
        this.onChange = Function.prototype;
        this.onTouched = Function.prototype;
    }
    // view -> model
    onClick() {
        if (this.isDisabled) {
            return;
        }
        this.toggle(!this.state);
        this.onChange(this.value);
    }
    ngOnInit() {
        this.toggle(this.trueValue === this.value);
    }
    get trueValue() {
        return typeof this.btnCheckboxTrue !== 'undefined'
            ? this.btnCheckboxTrue
            : true;
    }
    get falseValue() {
        return typeof this.btnCheckboxFalse !== 'undefined'
            ? this.btnCheckboxFalse
            : false;
    }
    toggle(state) {
        this.state = state;
        this.value = this.state ? this.trueValue : this.falseValue;
    }
    // ControlValueAccessor
    // model -> view
    writeValue(value) {
        this.state = this.trueValue === value;
        this.value = value ? this.trueValue : this.falseValue;
    }
    setDisabledState(isDisabled) {
        this.isDisabled = isDisabled;
    }
    registerOnChange(fn) {
        this.onChange = fn;
    }
    registerOnTouched(fn) {
        this.onTouched = fn;
    }
}
ButtonCheckboxDirective.decorators = [
    { type: Directive, args: [{
                selector: '[btnCheckbox]',
                providers: [CHECKBOX_CONTROL_VALUE_ACCESSOR]
            },] }
];
ButtonCheckboxDirective.propDecorators = {
    btnCheckboxTrue: [{ type: Input }],
    btnCheckboxFalse: [{ type: Input }],
    state: [{ type: HostBinding, args: ['class.active',] }, { type: HostBinding, args: ['attr.aria-pressed',] }],
    onClick: [{ type: HostListener, args: ['click',] }]
};
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