157 lines
2.8 KiB
Go
157 lines
2.8 KiB
Go
package uiterm
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import (
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"strings"
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"github.com/nsf/termbox-go"
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)
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type Textview struct {
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Lines []string
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CurrentLine int
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Fg, Bg Attribute
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parsedLines []string
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ui *Ui
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x0, y0, x1, y1 int
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}
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func (t *Textview) uiInitialize(ui *Ui) {
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t.ui = ui
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}
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func (t *Textview) uiSetActive(active bool) {
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}
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func (t *Textview) uiSetBounds(x0, y0, x1, y1 int) {
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t.x0 = x0
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t.y0 = y0
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t.x1 = x1
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t.y1 = y1
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t.updateParsedLines()
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t.uiDraw()
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}
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func (t *Textview) ScrollUp() {
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if newLine := t.CurrentLine + 1; newLine < len(t.parsedLines) {
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t.CurrentLine = newLine
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}
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t.uiDraw()
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}
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func (t *Textview) ScrollDown() {
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if newLine := t.CurrentLine - 1; newLine >= 0 {
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t.CurrentLine = newLine
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}
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t.uiDraw()
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}
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func (t *Textview) ScrollTop() {
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if newLine := len(t.parsedLines) - 1; newLine > 0 {
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t.CurrentLine = newLine
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} else {
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t.CurrentLine = 0
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}
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t.uiDraw()
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}
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func (t *Textview) ScrollBottom() {
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t.CurrentLine = 0
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t.uiDraw()
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}
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func (t *Textview) updateParsedLines() {
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width := t.x1 - t.x0 - 3
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if t.Lines == nil || width <= 0 {
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t.parsedLines = nil
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return
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}
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parsed := make([]string, 0, len(t.Lines))
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for _, line := range t.Lines {
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current := ""
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chars := 0
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reader := strings.NewReader(line)
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for {
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if chars >= width {
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parsed = append(parsed, current)
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chars = 0
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current = ""
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}
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if reader.Len() <= 0 {
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if chars > 0 {
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parsed = append(parsed, current)
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}
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break
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}
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if ch, _, err := reader.ReadRune(); err == nil {
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current = current + string(ch)
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chars++
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}
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}
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}
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t.parsedLines = parsed
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}
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func (t *Textview) AddLine(line string) {
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t.Lines = append(t.Lines, line)
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t.updateParsedLines()
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t.uiDraw()
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}
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func (t *Textview) Clear() {
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t.Lines = nil
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t.CurrentLine = 0
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t.parsedLines = nil
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t.uiDraw()
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}
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func (t *Textview) uiDraw() {
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t.ui.beginDraw()
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defer t.ui.endDraw()
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var reader *strings.Reader
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line := len(t.parsedLines) - 1 - t.CurrentLine
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if line < 0 {
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line = 0
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}
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totalLines := len(t.parsedLines)
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if totalLines == 0 {
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totalLines = 1
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}
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currentScrollLine := t.y1 - 1 - int((float32(t.CurrentLine)/float32(totalLines))*float32(t.y1-t.y0))
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for y := t.y1 - 1; y >= t.y0; y-- {
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if t.parsedLines != nil && line >= 0 {
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reader = strings.NewReader(t.parsedLines[line])
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} else {
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reader = nil
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}
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for x := t.x0; x < t.x1; x++ {
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var chr rune = ' '
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if x == t.x1-1 { // scrollbar
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if y == currentScrollLine {
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chr = '█'
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} else {
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chr = '░'
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}
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} else if x < t.x1-3 {
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if reader != nil {
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if ch, _, err := reader.ReadRune(); err == nil {
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chr = ch
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}
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}
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}
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termbox.SetCell(x, y, chr, termbox.Attribute(t.Fg), termbox.Attribute(t.Bg))
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}
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line--
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}
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}
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func (t *Textview) uiKeyEvent(mod Modifier, key Key) {
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}
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func (t *Textview) uiCharacterEvent(chr rune) {
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}
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