termui/_widget/list.go
2015-09-18 11:41:44 -04:00

98 lines
2.1 KiB
Go

// +build ignore
// Copyright 2015 Zack Guo <gizak@icloud.com>. All rights reserved.
// Use of this source code is governed by a MIT license that can
// be found in the LICENSE file.
package termui
// List displays []string as its items,
// it has a Overflow option (default is "hidden"), when set to "hidden",
// the item exceeding List's width is truncated, but when set to "wrap",
// the overflowed text breaks into next line.
/*
strs := []string{
"[0] github.com/gizak/termui",
"[1] editbox.go",
"[2] iterrupt.go",
"[3] keyboard.go",
"[4] output.go",
"[5] random_out.go",
"[6] dashboard.go",
"[7] nsf/termbox-go"}
ls := termui.NewList()
ls.Items = strs
ls.ItemFgColor = termui.ColorYellow
ls.Border.Label = "List"
ls.Height = 7
ls.Width = 25
ls.Y = 0
*/
type List struct {
Block
Items []string
Overflow string
ItemFgColor Attribute
ItemBgColor Attribute
RendererFactory TextRendererFactory
}
// NewList returns a new *List with current theme.
func NewList() *List {
l := &List{Block: *NewBlock()}
l.Overflow = "hidden"
l.ItemFgColor = theme.ListItemFg
l.ItemBgColor = theme.ListItemBg
l.RendererFactory = PlainRendererFactory{}
return l
}
// Buffer implements Bufferer interface.
func (l *List) Buffer() []Point {
buffer := l.Block.Buffer()
breakLoop := func(y int) bool {
return y+1 > l.innerHeight
}
y := 0
MainLoop:
for _, item := range l.Items {
x := 0
bg, fg := l.ItemFgColor, l.ItemBgColor
renderer := l.RendererFactory.TextRenderer(item)
sequence := renderer.Render(bg, fg)
for n := range []rune(sequence.NormalizedText) {
point, width := sequence.PointAt(n, x+l.innerX, y+l.innerY)
if width+x <= l.innerWidth {
buffer = append(buffer, point)
x += width
} else {
if l.Overflow == "wrap" {
y++
if breakLoop(y) {
break MainLoop
}
x = 0
} else {
dotR := []rune(dot)[0]
dotX := l.innerWidth + l.innerX - charWidth(dotR)
p := newPointWithAttrs(dotR, dotX, y+l.innerY, bg, fg)
buffer = append(buffer, p)
break
}
}
}
y++
if breakLoop(y) {
break MainLoop
}
}
return l.Block.chopOverflow(buffer)
}