189 lines
3.0 KiB
Go
189 lines
3.0 KiB
Go
package exhibit
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import (
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"sync"
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)
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type ListEntry interface {
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String() string
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Attributes() Attributes
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}
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type ListWidget struct {
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Constraints Constraints
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Attrs Attributes
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cellLock sync.Mutex
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cells [][]Cell
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rightAlign bool
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border bool
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listLock sync.Mutex
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list [][]Cell
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listBuf [][]Cell
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lastSize Size
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}
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func (l *ListWidget) Render() [][]Cell {
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l.cellLock.Lock()
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defer l.cellLock.Unlock()
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var sx int
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sy := len(l.cells)
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if sy > 0 {
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sx = len(l.cells[0])
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} else {
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return make([][]Cell, 0)
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}
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dx := 0
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dy := 0
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if l.lastSize.X > sx {
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dx = l.lastSize.X - sx
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}
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if l.lastSize.Y > sy {
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dy = l.lastSize.Y - sy
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}
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for y := 0; y < sy+dy; y++ {
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if y >= sy {
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l.cells = append(l.cells, []Cell{})
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}
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for x := 0; x < sx+dx; x++ {
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if x >= sx || y >= sy {
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c := Cell{}
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c.Pos.X = x
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c.Pos.Y = y
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c.Value = ' '
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l.cells[y] = append(l.cells[y], c)
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} else {
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l.cells[y][x].Pos.X = x
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l.cells[y][x].Pos.Y = y
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}
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}
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}
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l.lastSize.X = sx
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l.lastSize.Y = sy
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return append([][]Cell(nil), l.cells...)
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}
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func (l *ListWidget) AddEntry(entry ListEntry) {
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if l.listBuf == nil {
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l.listBuf = make([][]Cell, 1)
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} else {
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l.listBuf = append(l.listBuf, []Cell{})
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}
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index := len(l.listBuf) - 1
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for _, r := range entry.String() {
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cell := Cell{}
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cell.Value = r
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cell.Attrs = entry.Attributes()
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l.listBuf[index] = append(l.listBuf[index], cell)
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}
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}
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func (l *ListWidget) Commit() {
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l.listLock.Lock()
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l.list = append([][]Cell{}, l.listBuf...)
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l.listLock.Unlock()
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l.listBuf = nil
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l.recalculateCells()
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}
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func (l *ListWidget) SetBorder(b bool) {
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if l.border == b {
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return
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}
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l.border = b
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l.recalculateCells()
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}
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func (l *ListWidget) SetRightAlign(b bool) {
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if l.rightAlign == b {
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return
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}
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l.rightAlign = b
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l.recalculateCells()
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}
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func (l *ListWidget) recalculateCells() {
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l.listLock.Lock()
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defer l.listLock.Unlock()
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var longest int
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var border int
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for _, s := range l.list {
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if longest < len(s) {
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longest = len(s)
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}
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}
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cells := make([][]Cell, len(l.list))
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if l.border {
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border = 1
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top := make([]Cell, longest+2)
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top[0] = Cell{Value: '┏', Attrs: l.Attrs}
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top[longest+1] = Cell{Value: '┓', Attrs: l.Attrs}
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for i := 1; i <= longest; i++ {
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top[i] = Cell{Value: '━', Attrs: l.Attrs}
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}
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bottom := append([]Cell(nil), top...)
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bottom[0] = Cell{Value: '┗', Attrs: l.Attrs}
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bottom[longest+1] = Cell{Value: '┛', Attrs: l.Attrs}
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cells = append([][]Cell{top}, cells...)
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cells = append(cells, bottom)
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}
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for i, s := range l.list {
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cells[i+border] = make([]Cell, longest+border+border)
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var start int
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if l.rightAlign {
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start = longest - len(s)
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} else {
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start = 0
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}
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if l.border {
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c := Cell{Value: '┃', Attrs: l.Attrs}
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cells[i+border][0] = c
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cells[i+border][longest+1] = c
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}
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for j := 0; j < longest; j++ {
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c := Cell{}
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if j > start+len(s)-1 || j < start {
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c.Value = ' '
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} else {
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c = s[j-start]
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}
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cells[i+border][j+border] = c
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}
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}
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l.cellLock.Lock()
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defer l.cellLock.Unlock()
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l.cells = cells
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}
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