tins2020/animation.go

package tins2020

import "time"

type Animation struct {
	active     bool
	start      time.Time
	interval   time.Duration
	lastUpdate time.Duration
}

func NewAnimation(interval time.Duration) Animation {
	return Animation{
		active:   true,
		start:    time.Now(),
		interval: interval,
	}
}

func NewAnimationPtr(interval time.Duration) *Animation {
	ani := NewAnimation(interval)
	return &ani
}

func (a *Animation) Animate() bool {
	since := time.Since(a.start)
	if !a.active || since < a.lastUpdate+a.interval {
		return false
	}
	a.lastUpdate += a.interval
	return true
}

func (a *Animation) AnimateFn(fn func()) {
	since := time.Since(a.start)
	for a.active && since > a.lastUpdate+a.interval {
		fn()
		a.lastUpdate += a.interval
	}
}

func (a *Animation) Pause() {
	a.active = false
}

func (a *Animation) Run() {
	if a.active {
		return
	}
	a.active = true
	a.start = time.Now()
	a.lastUpdate = 0
}

func (a *Animation) SetInterval(interval time.Duration) {
	a.interval = interval
}