sampler-fork/event/handler.go

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package event
import (
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"github.com/sqshq/sampler/component/layout"
"github.com/sqshq/sampler/config"
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"github.com/sqshq/sampler/console"
ui "github.com/sqshq/termui"
"time"
)
const (
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refreshRateToRenderRateRatio = 0.5
)
type Handler struct {
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layout *layout.Layout
renderTicker *time.Ticker
consoleEvents <-chan ui.Event
renderRate time.Duration
}
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func NewHandler(layout *layout.Layout) Handler {
renderRate := calcMinRenderRate(layout)
return Handler{
layout: layout,
consoleEvents: ui.PollEvents(),
renderTicker: time.NewTicker(renderRate),
renderRate: renderRate,
}
}
func (h *Handler) HandleEvents() {
// initial render
ui.Render(h.layout)
for {
select {
case mode := <-h.layout.ChangeModeEvents:
h.handleModeChange(mode)
case <-h.renderTicker.C:
ui.Render(h.layout)
case e := <-h.consoleEvents:
switch e.ID {
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case console.KeyQuit, console.KeyExit:
h.handleExit()
return
case console.SignalResize:
payload := e.Payload.(ui.Resize)
h.layout.ChangeDimensions(payload.Width, payload.Height)
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default:
h.layout.HandleConsoleEvent(e.ID)
}
}
}
}
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func (h *Handler) handleModeChange(m layout.Mode) {
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// render the change before switching the tickers
ui.Render(h.layout)
h.renderTicker.Stop()
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switch m {
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case layout.ModeDefault:
h.renderTicker = time.NewTicker(h.renderRate)
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case layout.ModePause:
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// proceed with stopped timer
default:
h.renderTicker = time.NewTicker(console.MinRenderInterval)
}
}
func (h *Handler) handleExit() {
var settings []config.ComponentSettings
for _, c := range h.layout.Components {
settings = append(settings,
config.ComponentSettings{Type: c.Type, Title: c.Title, Size: c.Size, Position: c.Position})
}
config.Update(settings)
}
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func calcMinRenderRate(layout *layout.Layout) time.Duration {
minRefreshRateMs := layout.Components[0].RefreshRateMs
for _, c := range layout.Components {
if c.RefreshRateMs < minRefreshRateMs {
minRefreshRateMs = c.RefreshRateMs
}
}
renderRate := time.Duration(
int(float64(minRefreshRateMs)*refreshRateToRenderRateRatio)) * time.Millisecond
if renderRate < console.MinRenderInterval {
return console.MinRenderInterval
}
if renderRate > console.MaxRenderInterval {
return console.MaxRenderInterval
}
return renderRate
}