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package ui
import (
"image/color"
"iter"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/text/v2"
"muhq.space/muhqs-game/go/font"
"muhq.space/muhqs-game/go/game"
)
var (
BUFFER_BACKGROUND = Gray
BUFFER_FOREGROUND = color.White
)
type Buffer struct {
WidgetBase
lines []string
highlights map[int]color.Color
pos int
font *text.GoTextFace
lineSpacing float64
xMargin float64
bg color.Color
fg color.Color
}
func NewBuffer(x, y int, width, height int) *Buffer {
b := &Buffer{
NewWidgetBase(x, y, width, height),
[]string{},
make(map[int]color.Color),
0,
font.Font18,
1.5,
10.,
BUFFER_BACKGROUND,
BUFFER_FOREGROUND,
}
b.renderImpl = func() *ebiten.Image { return b.render() }
return b
}
func (b *Buffer) render() *ebiten.Image {
img := ebiten.NewImage(b.Width, b.Height)
img.Fill(b.bg)
y := -b.font.Size
for i, line := range b.lines[b.pos:] {
_, h := text.Measure(line, b.font, b.font.Size*b.lineSpacing)
y += h
if y > float64(b.Height) {
break
}
op := &text.DrawOptions{}
if clr, highlighted := b.highlights[i]; highlighted {
op.ColorScale.ScaleWithColor(clr)
} else {
op.ColorScale.ScaleWithColor(b.fg)
}
op.GeoM.Translate(b.xMargin, float64(y))
op.LineSpacing = b.font.Size * b.lineSpacing
text.Draw(img, line, b.font, op)
}
return img
}
func (b *Buffer) AddLines(lines []string) {
b.lines = append(b.lines, lines...)
b.ForceRedraw()
}
func (b *Buffer) AddLine(line string) {
b.AddLines([]string{line})
}
func (b *Buffer) AddText(text string) {
// TODO: auto break text
lines := []string{text}
b.AddLines(lines)
}
func (b *Buffer) ClearLines() {
b.lines = []string{}
b.ForceRedraw()
}
func (b *Buffer) RemoveLast() {
b.lines = b.lines[:len(b.lines)-1]
b.ForceRedraw()
}
func (b *Buffer) Remove(idx int) {
b.lines = append(b.lines[:idx], b.lines[idx+1:]...)
b.ForceRedraw()
}
func (b *Buffer) PrefixLine(idx int, prefix string) {
b.lines[idx] = prefix + b.lines[idx]
b.ForceRedraw()
}
func (b *Buffer) LinesSeq() iter.Seq[string] {
return func(yield func(string) bool) {
for _, l := range b.lines {
if !yield(l) {
return
}
}
}
}
func (*Buffer) IsScrollable() bool { return true }
func (b *Buffer) Scroll(x, y int) {
if y == 0 {
return
}
if y < 0 && b.pos > 0 {
b.pos--
} else if y > 0 && b.pos < len(b.lines)-1 {
b.pos++
}
b.ForceRedraw()
}
func (b *Buffer) Bg(bg color.Color) *Buffer {
b.bg = bg
return b
}
func (b *Buffer) Fg(fg color.Color) *Buffer {
b.fg = fg
return b
}
type StackBuffer struct {
Buffer
actions []game.Action
}
func NewStackBuffer(x, y int, width, height int, actions []game.Action) *StackBuffer {
sb := &StackBuffer{Buffer: *NewBuffer(x, y, width, height)}
// This is needed because we do not use the pointer created in NewBuffer
sb.renderImpl = func() *ebiten.Image { return sb.render() }
for _, action := range actions {
sb.AddAction(action)
}
return sb
}
func (b *StackBuffer) AddAction(a game.Action) {
b.AddLine(a.String())
b.actions = append(b.actions, a)
}
func (b *StackBuffer) AddHighlight(a game.Action, clr color.Color) {
for i, ba := range b.actions {
if a == ba {
b.highlights[i] = clr
}
}
b.ForceRedraw()
}
func (b *StackBuffer) ClearHighlights() {
b.highlights = make(map[int]color.Color)
b.ForceRedraw()
}
func (b *StackBuffer) RemoveLast() {
b.Buffer.RemoveLast()
// Remove potential highlight
i := len(b.actions) - 1
delete(b.highlights, i)
b.actions = b.actions[:i]
}
func (b *StackBuffer) FindObjectAt(x, y int) any {
if !b.Contains(x, y) {
return nil
}
var _y float64 = 0
for i, line := range b.lines[b.pos:] {
_, h := text.Measure(line, b.font, b.font.Size*b.lineSpacing)
_y += h
if int(_y)+b.Y >= y {
return b.actions[i]
}
}
return nil
}
|
