122 lines
2.4 KiB
Go
122 lines
2.4 KiB
Go
// Copyright 2015 Zack Guo <gizak@icloud.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.Border.Label = "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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// Align is the position of the gauge's label.
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type Align int
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// All supported positions.
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const (
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AlignLeft Align = iota
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AlignCenter
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AlignRight
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)
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const uint16max = ^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: theme.GaugePercent,
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BarColor: theme.GaugeBar,
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Label: "{{percent}}%",
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LabelAlign: AlignCenter,
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PercentColorHighlighted: Attribute(uint16max),
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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() []Point {
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ps := g.Block.Buffer()
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// plot bar
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w := g.Percent * g.innerWidth / 100
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for i := 0; i < g.innerHeight; i++ {
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for j := 0; j < w; j++ {
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p := Point{}
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p.X = g.innerX + j
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p.Y = g.innerY + i
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p.Ch = ' '
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p.Bg = g.BarColor
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if p.Bg == ColorDefault {
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p.Bg |= AttrReverse
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}
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ps = append(ps, p)
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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.innerY + g.innerHeight/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.innerWidth - strWidth(s)) / 2
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case AlignRight:
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pos = g.innerWidth - strWidth(s)
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}
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pos += g.innerX
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for i, v := range rs {
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p := Point{}
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p.X = 1 + pos + i
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p.Y = pry
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p.Ch = v
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p.Fg = g.PercentColor
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if w+g.innerX > pos+i {
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p.Bg = g.BarColor
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if p.Bg == ColorDefault {
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p.Bg |= AttrReverse
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}
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if g.PercentColorHighlighted != Attribute(uint16max) {
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p.Fg = g.PercentColorHighlighted
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}
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} else {
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p.Bg = g.Block.BgColor
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}
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ps = append(ps, p)
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}
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return g.Block.chopOverflow(ps)
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}
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