104 lines
2.0 KiB
Go
104 lines
2.0 KiB
Go
package tui
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import (
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"github.com/lixenwraith/color"
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"github.com/lixenwraith/terminal"
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)
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// ListItem represents a single row in a scrollable list
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type ListItem struct {
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Indent int // Left padding in cells
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Icon rune // Expand indicator or bullet, 0 = none
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IconFg color.RGB
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Check CheckState // CheckNone to skip checkbox
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CheckFg color.RGB
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Text string
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TextStyle Style
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}
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// ListOpts configures list rendering
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type ListOpts struct {
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CursorBg color.RGB
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DefaultBg color.RGB
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IconWidth int // Width reserved for icon, default 2
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}
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// List renders scrollable list items within region, returns number of rows rendered
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func (r Region) List(items []ListItem, cursor, scroll int, opts ListOpts) int {
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if r.H < 1 || len(items) == 0 {
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return 0
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}
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iconW := opts.IconWidth
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if iconW == 0 {
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iconW = 2
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}
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rendered := 0
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for y := 0; y < r.H; y++ {
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idx := scroll + y
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if idx >= len(items) {
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break
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}
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item := items[idx]
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isCursor := idx == cursor
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// Row background
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bg := opts.DefaultBg
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if isCursor {
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bg = opts.CursorBg
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}
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// Clear row
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for x := 0; x < r.W; x++ {
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r.Cell(x, y, ' ', color.RGB{}, bg, terminal.AttrNone)
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}
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x := item.Indent
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// Icon
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if item.Icon != 0 && x < r.W {
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r.Cell(x, y, item.Icon, item.IconFg, bg, terminal.AttrNone)
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}
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x += iconW
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// Checkbox
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if item.Check != CheckNone || item.CheckFg != (color.RGB{}) {
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if x+3 <= r.W {
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var ch rune
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switch item.Check {
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case CheckNone:
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ch = ' '
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case CheckPartial:
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ch = 'o'
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case CheckFull:
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ch = 'x'
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case CheckPlus:
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ch = '+'
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}
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r.Cell(x, y, '[', item.CheckFg, bg, terminal.AttrNone)
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r.Cell(x+1, y, ch, item.CheckFg, bg, terminal.AttrNone)
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r.Cell(x+2, y, ']', item.CheckFg, bg, terminal.AttrNone)
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}
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x += 4
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}
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// Text
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textStyle := item.TextStyle
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if textStyle.Bg == (color.RGB{}) {
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textStyle.Bg = bg
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}
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text := item.Text
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if x+RuneLen(text) > r.W {
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text = Truncate(text, r.W-x)
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}
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r.TextStyled(x, y, text, textStyle)
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rendered++
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}
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return rendered
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}
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