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donutdemo.go
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/
donutdemo.go
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// Copyright 2019 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Binary donutdemo displays a couple of Donut widgets.
// Exist when 'q' is pressed.
package main
import (
"context"
"time"
"github.com/mum4k/termdash"
"github.com/mum4k/termdash/cell"
"github.com/mum4k/termdash/container"
"github.com/mum4k/termdash/linestyle"
"github.com/mum4k/termdash/terminal/tcell"
"github.com/mum4k/termdash/terminal/terminalapi"
"github.com/mum4k/termdash/widgets/donut"
)
// playType indicates how to play a donut.
type playType int
const (
playTypePercent playType = iota
playTypeAbsolute
)
// playDonut continuously changes the displayed percent value on the donut by the
// step once every delay. Exits when the context expires.
func playDonut(ctx context.Context, d *donut.Donut, start, step int, delay time.Duration, pt playType) {
progress := start
mult := 1
ticker := time.NewTicker(delay)
defer ticker.Stop()
for {
select {
case <-ticker.C:
switch pt {
case playTypePercent:
if err := d.Percent(progress); err != nil {
panic(err)
}
case playTypeAbsolute:
if err := d.Absolute(progress, 100); err != nil {
panic(err)
}
}
progress += step * mult
if progress > 100 || 100-progress < step {
progress = 100
} else if progress < 0 || progress < step {
progress = 0
}
if progress == 100 {
mult = -1
} else if progress == 0 {
mult = 1
}
case <-ctx.Done():
return
}
}
}
func main() {
t, err := tcell.New()
if err != nil {
panic(err)
}
defer t.Close()
ctx, cancel := context.WithCancel(context.Background())
green, err := donut.New(
donut.CellOpts(cell.FgColor(cell.ColorGreen)),
donut.Label("text label", cell.FgColor(cell.ColorGreen)),
)
if err != nil {
panic(err)
}
go playDonut(ctx, green, 0, 1, 250*time.Millisecond, playTypePercent)
blue, err := donut.New(donut.CellOpts(cell.FgColor(cell.ColorNumber(33))))
if err != nil {
panic(err)
}
go playDonut(ctx, blue, 25, 1, 500*time.Millisecond, playTypePercent)
yellow, err := donut.New(donut.CellOpts(cell.FgColor(cell.ColorYellow)))
if err != nil {
panic(err)
}
go playDonut(ctx, yellow, 50, 1, 1*time.Second, playTypeAbsolute)
red, err := donut.New(donut.CellOpts(cell.FgColor(cell.ColorRed)))
if err != nil {
panic(err)
}
go playDonut(ctx, red, 75, 1, 2*time.Second, playTypeAbsolute)
c, err := container.New(
t,
container.Border(linestyle.Light),
container.BorderTitle("PRESS Q TO QUIT"),
container.SplitVertical(
container.Left(
container.SplitVertical(
container.Left(container.PlaceWidget(green)),
container.Right(container.PlaceWidget(blue)),
),
),
container.Right(
container.SplitVertical(
container.Left(container.PlaceWidget(yellow)),
container.Right(container.PlaceWidget(red)),
),
),
),
)
if err != nil {
panic(err)
}
quitter := func(k *terminalapi.Keyboard) {
if k.Key == 'q' || k.Key == 'Q' {
cancel()
}
}
if err := termdash.Run(ctx, t, c, termdash.KeyboardSubscriber(quitter), termdash.RedrawInterval(1*time.Second)); err != nil {
panic(err)
}
}