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
|
// Copyright 2015 The Tcell Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use 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.
package views
import (
"sync"
"github.com/gdamore/tcell"
)
// TextBar is a Widget that provides a single line of text, but with
// distinct left, center, and right areas. Each of the areas can be styled
// differently, and they align to the left, center, and right respectively.
// This is basically a convenience type on top Text and BoxLayout.
type TextBar struct {
changed bool
style tcell.Style
left Text
right Text
center Text
view View
lview ViewPort
rview ViewPort
cview ViewPort
once sync.Once
WidgetWatchers
}
// SetCenter sets the center text for the textbar. The text is
// always center aligned.
func (t *TextBar) SetCenter(s string, style tcell.Style) {
t.initialize()
if style == tcell.StyleDefault {
style = t.style
}
t.center.SetText(s)
t.center.SetStyle(style)
}
// SetLeft sets the left text for the textbar. It is always left-aligned.
func (t *TextBar) SetLeft(s string, style tcell.Style) {
t.initialize()
if style == tcell.StyleDefault {
style = t.style
}
t.left.SetText(s)
t.left.SetStyle(style)
}
// SetRight sets the right text for the textbar. It is always right-aligned.
func (t *TextBar) SetRight(s string, style tcell.Style) {
t.initialize()
if style == tcell.StyleDefault {
style = t.style
}
t.right.SetText(s)
t.right.SetStyle(style)
}
// SetStyle is used to set a default style to use for the textbar, including
// areas where no text is present. Note that this will not change the text
// already displayed, so call this before changing or setting text.
func (t *TextBar) SetStyle(style tcell.Style) {
t.initialize()
t.style = style
}
func (t *TextBar) initialize() {
t.once.Do(func() {
t.center.SetView(&t.cview)
t.left.SetView(&t.lview)
t.right.SetView(&t.rview)
t.center.SetAlignment(VAlignTop | HAlignCenter)
t.left.SetAlignment(VAlignTop | HAlignLeft)
t.right.SetAlignment(VAlignTop | HAlignRight)
t.center.Watch(t)
t.left.Watch(t)
t.right.Watch(t)
})
}
func (t *TextBar) layout() {
w, _ := t.view.Size()
ww, wh := t.left.Size()
t.lview.Resize(0, 0, ww, wh)
ww, wh = t.center.Size()
t.cview.Resize((w-ww)/2, 0, ww, wh)
ww, wh = t.right.Size()
t.rview.Resize(w-ww, 0, ww, wh)
t.changed = false
}
// SetView sets the View drawing context for this TextBar.
func (t *TextBar) SetView(view View) {
t.initialize()
t.view = view
t.lview.SetView(view)
t.rview.SetView(view)
t.cview.SetView(view)
t.changed = true
}
// Draw draws the TextBar into its View context.
func (t *TextBar) Draw() {
t.initialize()
if t.changed {
t.layout()
}
w, h := t.view.Size()
for y := 0; y < h; y++ {
for x := 0; x < w; x++ {
t.view.SetContent(x, y, ' ', nil, t.style)
}
}
// Draw in reverse order -- if we clip, we will clip at the
// right side.
t.right.Draw()
t.center.Draw()
t.left.Draw()
}
// Resize is called when the TextBar's View changes size, and
// updates the layout.
func (t *TextBar) Resize() {
t.initialize()
t.layout()
t.left.Resize()
t.center.Resize()
t.right.Resize()
t.PostEventWidgetResize(t)
}
// Size implements the Size method for Widget, returning the width
// and height in character cells.
func (t *TextBar) Size() (int, int) {
w, h := 0, 0
ww, wh := t.left.Size()
w += ww
if wh > h {
h = wh
}
ww, wh = t.center.Size()
w += ww
if wh > h {
h = wh
}
ww, wh = t.right.Size()
w += ww
if wh > h {
h = wh
}
return w, h
}
// HandleEvent handles incoming events. The only events handled are
// those for the Text objects; when those change, the TextBar adjusts
// the layout to accommodate.
func (t *TextBar) HandleEvent(ev tcell.Event) bool {
switch ev.(type) {
case *EventWidgetContent:
t.changed = true
return true
}
return false
}
// NewTextBar creates an empty, initialized TextBar.
func NewTextBar() *TextBar {
t := &TextBar{}
t.initialize()
return t
}
|
