aboutsummaryrefslogtreecommitdiff
path: root/lib/ui/tab.go
blob: 00614723e30081bbbd64b8873d03842d2280099e (plain)
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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
package ui

import (
	"github.com/gdamore/tcell"
	"github.com/mattn/go-runewidth"
)

type Tabs struct {
	Tabs       []*Tab
	TabStrip   *TabStrip
	TabContent *TabContent
	Selected   int
	history    []int

	onInvalidateStrip   func(d Drawable)
	onInvalidateContent func(d Drawable)
}

type Tab struct {
	Content Drawable
	Name    string
	invalid bool
}

type TabStrip Tabs
type TabContent Tabs

func NewTabs() *Tabs {
	tabs := &Tabs{}
	tabs.TabStrip = (*TabStrip)(tabs)
	tabs.TabContent = (*TabContent)(tabs)
	tabs.history = []int{0}
	return tabs
}

func (tabs *Tabs) Add(content Drawable, name string) *Tab {
	tab := &Tab{
		Content: content,
		Name:    name,
	}
	tabs.Tabs = append(tabs.Tabs, tab)
	tabs.TabStrip.Invalidate()
	content.OnInvalidate(tabs.invalidateChild)
	return tab
}

func (tabs *Tabs) invalidateChild(d Drawable) {
	if tabs.Selected >= len(tabs.Tabs) {
		return
	}

	if tabs.Tabs[tabs.Selected].Content == d {
		if tabs.onInvalidateContent != nil {
			tabs.onInvalidateContent(tabs.TabContent)
		}
	}
}

func (tabs *Tabs) Remove(content Drawable) {
	for i, tab := range tabs.Tabs {
		if tab.Content == content {
			tabs.Tabs = append(tabs.Tabs[:i], tabs.Tabs[i+1:]...)
			tabs.removeHistory(i)
			break
		}
	}
	tabs.Select(tabs.popHistory())
	tabs.TabStrip.Invalidate()
}

func (tabs *Tabs) Replace(contentSrc Drawable, contentTarget Drawable, name string) {
	replaceTab := &Tab{
		Content: contentTarget,
		Name:    name,
	}
	for i, tab := range tabs.Tabs {
		if tab.Content == contentSrc {
			tabs.Tabs[i] = replaceTab
			tabs.Select(i)
			break
		}
	}
	tabs.TabStrip.Invalidate()
	contentTarget.OnInvalidate(tabs.invalidateChild)
}

func (tabs *Tabs) Select(index int) {
	if index >= len(tabs.Tabs) {
		panic("Tried to set tab index to a non-existing element")
	}

	if tabs.Selected != index {
		tabs.Selected = index
		tabs.pushHistory(index)
		tabs.TabStrip.Invalidate()
		tabs.TabContent.Invalidate()
	}
}

func (tabs *Tabs) pushHistory(index int) {
	tabs.history = append(tabs.history, index)
}

func (tabs *Tabs) popHistory() int {
	lastIdx := len(tabs.history) - 1
	item := tabs.history[lastIdx]
	tabs.history = tabs.history[:lastIdx]
	return item
}

func (tabs *Tabs) removeHistory(index int) {
	newHist := make([]int, 0, len(tabs.history))
	for i, item := range tabs.history {
		if item == index {
			continue
		}
		if item > index {
			item = item - 1
		}
		// dedup
		if i > 0 && len(newHist) > 0 && item == newHist[len(newHist)-1] {
			continue
		}
		newHist = append(newHist, item)
	}
	tabs.history = newHist
}

func (tabs *Tabs) MouseEvent(event tcell.Event) {
	switch event := event.(type) {
	case *tcell.EventMouse:
		if event.Buttons()&tcell.Button1 != 0 {
			x, y := event.Position()
			selectedTab, ok := tabs.TabStrip.Clicked(x, y)
			if ok {
				tabs.Select(selectedTab)
			}
		}
	}
}

// TODO: Color repository
func (strip *TabStrip) Draw(ctx *Context) {
	x := 0
	for i, tab := range strip.Tabs {
		style := tcell.StyleDefault.Reverse(true)
		if strip.Selected == i {
			style = tcell.StyleDefault
		}
		trunc := runewidth.Truncate(tab.Name, 32, "…")
		x += ctx.Printf(x, 0, style, " %s ", trunc)
	}
	style := tcell.StyleDefault.Reverse(true)
	ctx.Fill(x, 0, ctx.Width()-x, 1, ' ', style)
}

func (strip *TabStrip) Invalidate() {
	if strip.onInvalidateStrip != nil {
		strip.onInvalidateStrip(strip)
	}
}

func (strip *TabStrip) OnInvalidate(onInvalidate func(d Drawable)) {
	strip.onInvalidateStrip = onInvalidate
}

func (strip *TabStrip) Clicked(mouseX int, mouseY int) (int, bool) {
	x := 0
	if mouseY == 0 {
		for i, tab := range strip.Tabs {
			trunc := runewidth.Truncate(tab.Name, 32, "…")
			length := len(trunc) + 2
			if x <= mouseX && mouseX < x+length {
				return i, true
			}
			x += length
		}
	}
	return 0, false
}

func (content *TabContent) Children() []Drawable {
	children := make([]Drawable, len(content.Tabs))
	for i, tab := range content.Tabs {
		children[i] = tab.Content
	}
	return children
}

func (content *TabContent) Draw(ctx *Context) {
	if content.Selected >= len(content.Tabs) {
		width := ctx.Width()
		height := ctx.Height()
		ctx.Fill(0, 0, width, height, ' ', tcell.StyleDefault)
	}

	tab := content.Tabs[content.Selected]
	tab.Content.Draw(ctx)
}

func (content *TabContent) Invalidate() {
	if content.onInvalidateContent != nil {
		content.onInvalidateContent(content)
	}
	tab := content.Tabs[content.Selected]
	tab.Content.Invalidate()
}

func (content *TabContent) OnInvalidate(onInvalidate func(d Drawable)) {
	content.onInvalidateContent = onInvalidate
}