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// Copyright © 2019 Bjørn Erik Pedersen <bjorn.erik.pedersen@gmail.com>.
//
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
// Package debounce provides a debouncer func. The most typical use case would be
// the user typing a text into a form; the UI needs an update, but let's wait for
// a break.
package debounce
import (
"sync"
"time"
)
// New returns a debounced function that takes another functions as its argument.
// This function will be called when the debounced function stops being called
// for the given duration.
// The debounced function can be invoked with different functions, if needed,
// the last one will win.
func New(after time.Duration) func(f func()) {
d := &debouncer{after: after}
return func(f func()) {
d.add(f)
}
}
type debouncer struct {
mu sync.Mutex
after time.Duration
timer *time.Timer
}
func (d *debouncer) add(f func()) {
d.mu.Lock()
defer d.mu.Unlock()
if d.timer != nil {
d.timer.Stop()
}
d.timer = time.AfterFunc(d.after, f)
}
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