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