/
widgets.go
179 lines (150 loc) · 3.81 KB
/
widgets.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
// Copyright 2014 The gocui Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"errors"
"fmt"
"log"
"strings"
"github.com/jroimartin/gocui"
)
const delta = 0.2
type HelpWidget struct {
name string
x, y int
w, h int
body string
}
func NewHelpWidget(name string, x, y int, body string) *HelpWidget {
lines := strings.Split(body, "\n")
w := 0
for _, l := range lines {
if len(l) > w {
w = len(l)
}
}
h := len(lines) + 1
w = w + 1
return &HelpWidget{name: name, x: x, y: y, w: w, h: h, body: body}
}
func (w *HelpWidget) Layout(g *gocui.Gui) error {
v, err := g.SetView(w.name, w.x, w.y, w.x+w.w, w.y+w.h)
if err != nil {
if err != gocui.ErrUnknownView {
return err
}
fmt.Fprint(v, w.body)
}
return nil
}
type StatusbarWidget struct {
name string
x, y int
w int
val float64
}
func NewStatusbarWidget(name string, x, y, w int) *StatusbarWidget {
return &StatusbarWidget{name: name, x: x, y: y, w: w}
}
func (w *StatusbarWidget) SetVal(val float64) error {
if val < 0 || val > 1 {
return errors.New("invalid value")
}
w.val = val
return nil
}
func (w *StatusbarWidget) Val() float64 {
return w.val
}
func (w *StatusbarWidget) Layout(g *gocui.Gui) error {
v, err := g.SetView(w.name, w.x, w.y, w.x+w.w, w.y+2)
if err != nil && err != gocui.ErrUnknownView {
return err
}
v.Clear()
rep := int(w.val * float64(w.w-1))
fmt.Fprint(v, strings.Repeat("▒", rep))
return nil
}
type ButtonWidget struct {
name string
x, y int
w int
label string
handler func(g *gocui.Gui, v *gocui.View) error
}
func NewButtonWidget(name string, x, y int, label string, handler func(g *gocui.Gui, v *gocui.View) error) *ButtonWidget {
return &ButtonWidget{name: name, x: x, y: y, w: len(label) + 1, label: label, handler: handler}
}
func (w *ButtonWidget) Layout(g *gocui.Gui) error {
v, err := g.SetView(w.name, w.x, w.y, w.x+w.w, w.y+2)
if err != nil {
if err != gocui.ErrUnknownView {
return err
}
if _, err := g.SetCurrentView(w.name); err != nil {
return err
}
if err := g.SetKeybinding(w.name, gocui.KeyEnter, gocui.ModNone, w.handler); err != nil {
return err
}
fmt.Fprint(v, w.label)
}
return nil
}
func main() {
g, err := gocui.NewGui(gocui.OutputNormal)
if err != nil {
log.Panicln(err)
}
defer g.Close()
g.Highlight = true
g.SelFgColor = gocui.ColorRed
help := NewHelpWidget("help", 1, 1, helpText)
status := NewStatusbarWidget("status", 1, 7, 50)
butdown := NewButtonWidget("butdown", 52, 7, "DOWN", statusDown(status))
butup := NewButtonWidget("butup", 58, 7, "UP", statusUp(status))
g.SetManager(help, status, butdown, butup)
if err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit); err != nil {
log.Panicln(err)
}
if err := g.SetKeybinding("", gocui.KeyTab, gocui.ModNone, toggleButton); err != nil {
log.Panicln(err)
}
if err := g.MainLoop(); err != nil && err != gocui.ErrQuit {
log.Panicln(err)
}
}
func quit(g *gocui.Gui, v *gocui.View) error {
return gocui.ErrQuit
}
func toggleButton(g *gocui.Gui, v *gocui.View) error {
nextview := "butdown"
if v != nil && v.Name() == "butdown" {
nextview = "butup"
}
_, err := g.SetCurrentView(nextview)
return err
}
func statusUp(status *StatusbarWidget) func(g *gocui.Gui, v *gocui.View) error {
return func(g *gocui.Gui, v *gocui.View) error {
return statusSet(status, delta)
}
}
func statusDown(status *StatusbarWidget) func(g *gocui.Gui, v *gocui.View) error {
return func(g *gocui.Gui, v *gocui.View) error {
return statusSet(status, -delta)
}
}
func statusSet(sw *StatusbarWidget, inc float64) error {
val := sw.Val() + inc
if val < 0 || val > 1 {
return nil
}
return sw.SetVal(val)
}
const helpText = `KEYBINDINGS
Tab: Move between buttons
Enter: Push button
^C: Exit`