forked from Mirrors/bubbletea
67 lines
1.6 KiB
Go
67 lines
1.6 KiB
Go
package main
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// This example illustrates how to debounce commands.
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//
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// When the user presses a key we increment the "tag" value on the model and,
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// after a short delay, we include that tag value in the message produced
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// by the Tick command.
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//
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// In a subsequent Update, if the tag in the Msg matches current tag on the
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// model's state we know that the debouncing is complete and we can proceeed as
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// normal. If not, we simply ignore the inbound message.
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import (
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"fmt"
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"os"
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"time"
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tea "github.com/charmbracelet/bubbletea"
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)
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const debounceDuration = time.Second
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type exitMsg int
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type model struct {
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tag int
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}
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func (m model) Init() tea.Cmd {
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return nil
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}
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func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
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switch msg := msg.(type) {
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case tea.KeyMsg:
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// Increment the tag on the model...
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m.tag++
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return m, tea.Tick(debounceDuration, func(_ time.Time) tea.Msg {
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// ...and include a copy of that tag value in the message.
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return exitMsg(m.tag)
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})
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case exitMsg:
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// If the tag in the message doesn't match the tag on the model then we
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// know that this message was not the last one sent and another is on
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// the way. If that's the case we know, we can ignore this message.
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// Otherwise, the debounce timeout has passed and this message is a
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// valid debounced one.
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if int(msg) == m.tag {
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return m, tea.Quit
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}
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}
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return m, nil
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}
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func (m model) View() string {
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return fmt.Sprintf("Key presses: %d", m.tag) +
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"\nTo exit press any key, then wait for one second without pressing anything."
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}
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func main() {
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if _, err := tea.NewProgram(model{}).Run(); err != nil {
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fmt.Println("uh oh:", err)
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os.Exit(1)
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}
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}
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