uicore-ts/scripts/UITimer.ts

UICore is a library to build native-like user interfaces using pure Typescript. No HTML is needed at all. Components are described as TS classes and all user interactions are handled explicitly. This library is strongly inspired by the UIKit framework tha

const YES = true
const NO = false


export class UITimer {
    
    
    _intervalID!: number
    
    isValid: boolean = YES
    
    
    constructor(public interval: number, public repeats: boolean, public target: Function) {
        
        this.schedule()
        
    }
    
    
    schedule() {
    
        const callback = () => {
            if (this.repeats == NO) {
                this.invalidate()
            }
            this.target()
        }
    
        this._intervalID = window.setInterval(callback, this.interval * 1000)
    
    }
    
    
    reschedule() {
        
        this.invalidate()
        this.schedule()
        
    }
    
    
    fire() {
        if (this.repeats == NO) {
            this.invalidate()
        }
        else {
            this.reschedule()
        }
        this.target()
    }
    
    invalidate() {
        
        if (this.isValid) {
            
            clearInterval(this._intervalID)
            
            this.isValid = NO
            
        }
        
        
    }
    
    
}