support action targeting from the stack buffer

1 files changed, 73 insertions, 2 deletions

diff --git a/go/ui/buffer.go b/go/ui/buffer.go
index d2a4667e..c44bbdd0 100644
--- a/go/ui/buffer.go
+++ b/go/ui/buffer.go
@@ -8,6 +8,7 @@ import (
 	"github.com/hajimehoshi/ebiten/v2/text/v2"
 
 	"muhq.space/muhqs-game/go/font"
+	"muhq.space/muhqs-game/go/game"
 )
 
 var (
@@ -18,6 +19,7 @@ var (
 type Buffer struct {
 	WidgetBase
 	lines       []string
+	highlights  map[int]color.Color
 	pos         int
 	font        *text.GoTextFace
 	lineSpacing float64
@@ -30,6 +32,7 @@ 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,
@@ -45,14 +48,18 @@ func (b *Buffer) render() *ebiten.Image {
 	img := ebiten.NewImage(b.Width, b.Height)
 	img.Fill(b.bg)
 	var y float64 = -b.font.Size
-	for _, line := range b.lines[b.pos:] {
+	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{}
-		op.ColorScale.ScaleWithColor(b.fg)
+		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)
@@ -129,3 +136,67 @@ 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
+	if _, found := b.highlights[i]; found {
+		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
+}