154 lines
3.0 KiB
Go
154 lines
3.0 KiB
Go
package model
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import (
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"context"
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"fmt"
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"time"
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"github.com/rs/zerolog/log"
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)
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const (
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// DefaultFlashDelay sets the flash clear delay.
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DefaultFlashDelay = 3 * time.Second
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// FlashInfo represents an info message.
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FlashInfo FlashLevel = iota
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// FlashWarn represents an warning message.
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FlashWarn
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// FlashErr represents an error message.
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FlashErr
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)
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type LevelMessage struct {
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Level FlashLevel
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Text string
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}
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func newClearMessage() LevelMessage {
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return LevelMessage{}
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}
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func (l LevelMessage) IsClear() bool {
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return l.Text == ""
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}
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// FlashLevel represents flash message severity.
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type FlashLevel int
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// FlashChan represents a flash event channel.
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type FlashChan chan LevelMessage
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// FlashListener represents a text model listener.
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type FlashListener interface {
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// FlashChanged notifies the model changed.
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FlashChanged(FlashLevel, string)
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// FlashCleared notifies when the filter changed.
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FlashCleared()
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}
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// Flash represents a flash message model.
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type Flash struct {
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msg LevelMessage
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cancel context.CancelFunc
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delay time.Duration
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msgChan chan LevelMessage
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}
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func NewFlash(dur time.Duration) *Flash {
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return &Flash{
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delay: dur,
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msgChan: make(FlashChan, 3),
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}
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}
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// Channel returns the flash channel.
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func (f *Flash) Channel() FlashChan {
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return f.msgChan
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}
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// Info displays an info flash message.
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func (f *Flash) Info(msg string) {
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f.SetMessage(FlashInfo, msg)
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}
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// Infof displays a formatted info flash message.
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func (f *Flash) Infof(fmat string, args ...interface{}) {
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f.Info(fmt.Sprintf(fmat, args...))
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}
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// Warn displays a warning flash message.
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func (f *Flash) Warn(msg string) {
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log.Warn().Msg(msg)
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f.SetMessage(FlashWarn, msg)
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}
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// Warnf displays a formatted warning flash message.
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func (f *Flash) Warnf(fmat string, args ...interface{}) {
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f.Warn(fmt.Sprintf(fmat, args...))
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}
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// Err displays an error flash message.
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func (f *Flash) Err(err error) {
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log.Error().Msg(err.Error())
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f.SetMessage(FlashErr, err.Error())
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}
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// Errf displays a formatted error flash message.
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func (f *Flash) Errf(fmat string, args ...interface{}) {
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var err error
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for _, a := range args {
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switch e := a.(type) {
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case error:
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err = e
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}
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}
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log.Error().Err(err).Msgf(fmat, args...)
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f.SetMessage(FlashErr, fmt.Sprintf(fmat, args...))
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}
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// Clear clears the flash message.
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func (f *Flash) Clear() {
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f.fireCleared()
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}
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// SetMessage sets the flash level message.
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func (f *Flash) SetMessage(level FlashLevel, msg string) {
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if f.cancel != nil {
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f.cancel()
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f.cancel = nil
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}
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f.setLevelMessage(LevelMessage{Level: level, Text: msg})
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f.fireFlashChanged()
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var ctx context.Context
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ctx, f.cancel = context.WithCancel(context.Background())
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go f.refresh(ctx)
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}
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func (f *Flash) refresh(ctx context.Context) {
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for {
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select {
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case <-ctx.Done():
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return
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case <-time.After(f.delay):
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f.fireCleared()
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return
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}
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}
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}
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func (f *Flash) setLevelMessage(msg LevelMessage) {
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f.msg = msg
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}
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func (f *Flash) fireFlashChanged() {
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f.msgChan <- f.msg
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}
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func (f *Flash) fireCleared() {
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f.msgChan <- newClearMessage()
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}
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