110 lines
2.2 KiB
Go
110 lines
2.2 KiB
Go
// Copyright 2017 Zack Guo <zack.y.guo@gmail.com>. All rights reserved.
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// Use of this source code is governed by a MIT license that can
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// be found in the LICENSE file.
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package termui
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import (
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"strconv"
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"strings"
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)
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// Gauge is a progress bar like widget.
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// A simple example:
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/*
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g := termui.NewGauge()
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g.Percent = 40
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g.Width = 50
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g.Height = 3
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g.BorderLabel = "Slim Gauge"
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g.BarColor = termui.ColorRed
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g.PercentColor = termui.ColorBlue
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*/
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const ColorUndef Attribute = Attribute(^uint16(0))
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type Gauge struct {
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Block
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Percent int
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BarColor Attribute
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PercentColor Attribute
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PercentColorHighlighted Attribute
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Label string
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LabelAlign Align
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}
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// NewGauge return a new gauge with current theme.
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func NewGauge() *Gauge {
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g := &Gauge{
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Block: *NewBlock(),
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PercentColor: ThemeAttr("gauge.percent.fg"),
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BarColor: ThemeAttr("gauge.bar.bg"),
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Label: "{{percent}}%",
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LabelAlign: AlignCenter,
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PercentColorHighlighted: ColorUndef,
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}
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g.Width = 12
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g.Height = 5
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return g
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}
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// Buffer implements Bufferer interface.
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func (g *Gauge) Buffer() Buffer {
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buf := g.Block.Buffer()
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// plot bar
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w := g.Percent * g.innerArea.Dx() / 100
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for i := 0; i < g.innerArea.Dy(); i++ {
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for j := 0; j < w; j++ {
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c := Cell{}
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c.Ch = ' '
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c.Bg = g.BarColor
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if c.Bg == ColorDefault {
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c.Bg |= AttrReverse
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}
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buf.Set(g.innerArea.Min.X+j, g.innerArea.Min.Y+i, c)
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}
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}
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// plot percentage
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s := strings.Replace(g.Label, "{{percent}}", strconv.Itoa(g.Percent), -1)
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pry := g.innerArea.Min.Y + g.innerArea.Dy()/2
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rs := str2runes(s)
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var pos int
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switch g.LabelAlign {
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case AlignLeft:
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pos = 0
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case AlignCenter:
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pos = (g.innerArea.Dx() - strWidth(s)) / 2
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case AlignRight:
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pos = g.innerArea.Dx() - strWidth(s) - 1
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}
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pos += g.innerArea.Min.X
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for i, v := range rs {
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c := Cell{
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Ch: v,
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Fg: g.PercentColor,
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}
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if w+g.innerArea.Min.X > pos+i {
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c.Bg = g.BarColor
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if c.Bg == ColorDefault {
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c.Bg |= AttrReverse
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}
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if g.PercentColorHighlighted != ColorUndef {
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c.Fg = g.PercentColorHighlighted
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}
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} else {
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c.Bg = g.Block.Bg
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}
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buf.Set(1+pos+i, pry, c)
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}
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return buf
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}
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