216 lines
3.7 KiB
Go
216 lines
3.7 KiB
Go
package exhibit
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import (
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"image"
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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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Style Style
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blockLock sync.Mutex
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block Block
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attributesLock sync.Mutex
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attributes Attributes
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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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}
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func (l *ListWidget) Attributes() Attributes {
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l.attributesLock.Lock()
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defer l.attributesLock.Unlock()
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return l.attributes
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}
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func (l *ListWidget) SetAttributes(a Attributes) {
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l.attributesLock.Lock()
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l.attributes = a
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l.attributesLock.Unlock()
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l.recalculateCells()
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}
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func (l *ListWidget) Size() image.Point {
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l.blockLock.Lock()
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defer l.blockLock.Unlock()
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return l.block.Rect.Size()
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}
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func (l *ListWidget) SetSize(p image.Point) {
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l.blockLock.Lock()
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defer l.blockLock.Unlock()
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l.block.SetSize(p)
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}
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func (l *ListWidget) Origin() image.Point {
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l.blockLock.Lock()
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defer l.blockLock.Unlock()
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return l.block.Rect.Min
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}
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func (l *ListWidget) SetOrigin(p image.Point) {
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l.blockLock.Lock()
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defer l.blockLock.Unlock()
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l.block.SetOrigin(p)
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}
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func (l *ListWidget) Render(origin image.Point) Block {
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l.blockLock.Lock()
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defer l.blockLock.Unlock()
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b := NewBlock(0, 0, 0, 0)
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b.Rect = l.block.Rect.Add(origin)
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for k, v := range l.block.Cells {
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k = k.Add(origin)
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b.Cells[k] = v
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}
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return b
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}
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func (l *ListWidget) AddEntry(entry ListEntry) {
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l.listLock.Lock()
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defer l.listLock.Unlock()
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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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l.blockLock.Lock()
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origin := l.block.Rect.Min
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size := l.block.Rect.Size()
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l.blockLock.Unlock()
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cells := make(map[image.Point]Cell)
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var i, bx, by int
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if l.border {
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size = size.Add(image.Point{2, 2})
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bx = 1
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by = 1
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}
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for x := 0; x < size.X; x++ {
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for y := 0; y < size.Y; y++ {
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c := Cell{Value: ' '}
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point := image.Pt(x, y).Add(origin)
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if l.border {
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cell, ok := l.borderCell(image.Pt(x, y), size)
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if ok {
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cells[point] = cell
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continue
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}
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}
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if y < len(l.list)+by {
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length := len(l.list[y-by])
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if l.rightAlign {
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i = (size.X - x - length - bx) * -1
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} else {
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i = x - bx
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}
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if i < length && i >= 0 {
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c = l.list[y-by][i]
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}
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cells[point] = c
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}
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}
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}
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l.blockLock.Lock()
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l.block.Cells = cells
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l.blockLock.Unlock()
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}
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func (l *ListWidget) borderCell(p image.Point, size image.Point) (Cell, bool) {
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c := Cell{}
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c.Attrs = l.Attributes()
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if p.X != 0 && p.X != size.X-1 && p.Y != 0 && p.Y != size.Y-1 {
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return c, false
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}
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if p.X == 0 && p.Y == 0 {
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c.Value = BorderRune(TopLeft, l.Style)
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} else if p.X == size.X-1 && p.Y == 0 {
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c.Value = BorderRune(TopRight, l.Style)
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} else if p.X == 0 && p.Y == size.Y-1 {
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c.Value = BorderRune(BottomLeft, l.Style)
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} else if p.X == size.X-1 && p.Y == size.Y-1 {
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c.Value = BorderRune(BottomRight, l.Style)
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} else if p.X == 0 || p.X == size.X-1 {
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c.Value = BorderRune(Vertical, l.Style)
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} else if p.Y == 0 || p.Y == size.Y-1 {
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c.Value = BorderRune(Horizontal, l.Style)
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}
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return c, true
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}
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