add text input and properly center text

6 files changed, 88 insertions, 27 deletions

diff --git a/go/ui/buffer.go b/go/ui/buffer.go
index c451d7fc..e95102fe 100644
--- a/go/ui/buffer.go
+++ b/go/ui/buffer.go
@@ -64,3 +64,16 @@ func (b *Buffer) Remove(idx int) {
 	b.lines = append(b.lines[:idx], b.lines[idx+1:]...)
 	b.ForceRedraw()
 }
+
+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()
+}
diff --git a/go/ui/button.go b/go/ui/button.go
index 6454ccac..0fd26936 100644
--- a/go/ui/button.go
+++ b/go/ui/button.go
@@ -35,15 +35,8 @@ func (b *SimpleButton) render() *ebiten.Image {
 	ebitenutil.DrawRect(img, float64(0), float64(0), float64(b.Width), float64(b.Height), b.BG)
 
 	bounds := text.BoundString(font.Font24, b.label)
-	x := (b.Width - bounds.Dx()) / 2
-	if x < 0 {
-		x = 0
-	}
-
-	y := b.Height - bounds.Dy()/2
-	if y < 0 {
-		y = 0
-	}
+	x := b.Width/2 - centerTextXOffset(bounds)
+	y := b.Height/2 - centerTextYOffset(bounds)
 	text.Draw(img, b.label, font.Font24, x, y, b.FG)
 	return img
 }
diff --git a/go/ui/stateBar.go b/go/ui/stateBar.go
index 6914de6e..3b9407b5 100644
--- a/go/ui/stateBar.go
+++ b/go/ui/stateBar.go
@@ -50,12 +50,12 @@ func (sb *StateBar) FindObjectAt(x, y int) interface{} {
 
 func (sb *StateBar) ForceRedraw() {
 	if sb.resourceView != nil {
-		sb.resourceView.Text = sb.resourceLabel()
+		sb.resourceView.text = sb.resourceLabel()
 		sb.resourceView.ForceRedraw()
 	}
 
 	if sb.phaseView != nil {
-		sb.phaseView.Text = sb.phaseLabel()
+		sb.phaseView.text = sb.phaseLabel()
 		sb.phaseView.ForceRedraw()
 	}
 }
diff --git a/go/ui/textBox.go b/go/ui/textBox.go
index b4a580bf..d0afbd9b 100644
--- a/go/ui/textBox.go
+++ b/go/ui/textBox.go
@@ -5,6 +5,7 @@ import (
 	"image/color"
 
 	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
 	"github.com/hajimehoshi/ebiten/v2/text"
 	"muhq.space/muhqs-game/go/font"
 	"muhq.space/muhqs-game/go/game"
@@ -19,7 +20,7 @@ var (
 
 type TextBox struct {
 	WidgetBase
-	Text    string
+	text    string
 	Fg      color.Color
 	Bg      color.Color
 	XMargin int
@@ -30,7 +31,7 @@ type TextBox struct {
 func NewFixedTextBox(x, y int, width, height int, t string, center bool) *TextBox {
 	tb := &TextBox{
 		WidgetBase: NewWidgetBase(x, y, width, height),
-		Text:       t,
+		text:       t,
 		Fg:         TEXTBOX_DEFAULT_FOREGROUND,
 		Bg:         TEXTBOX_DEFAULT_BACKGROUND,
 		XMargin:    TEXTBOX_DEFAULT_MARGIN,
@@ -75,7 +76,7 @@ func NewPermInfo(x, y int, p game.Permanent) *TextBox {
 
 func (tb *TextBox) render() *ebiten.Image {
 	var x, y int
-	b := text.BoundString(font.Font24, tb.Text)
+	b := text.BoundString(font.Font24, tb.text)
 	if tb.Width == -1 || tb.Height == -1 {
 		tb.Width = b.Dx() + 2*tb.XMargin
 		tb.Height = b.Dy() + 2*tb.YMargin
@@ -85,21 +86,15 @@ func (tb *TextBox) render() *ebiten.Image {
 		if !tb.Center {
 			x = tb.XMargin + b.Min.X
 		} else {
-			x = (tb.Width - b.Dx()) / 2
-			if x < 0 {
-				x = 0
-			}
+			x = tb.Width/2 - centerTextXOffset(b)
 		}
 
-		y = tb.Height - b.Dy()/2
-		if y < 0 {
-			y = 0
-		}
+		y = tb.Height/2 - centerTextYOffset(b)
 	}
 
 	img := ebiten.NewImage(tb.Width, tb.Height)
 	img.Fill(tb.Bg)
-	text.Draw(img, tb.Text, font.Font24, x, y, tb.Fg)
+	text.Draw(img, tb.text, font.Font24, x, y, tb.Fg)
 	return img
 }
 
@@ -114,7 +109,7 @@ func NewPocList(centerX, bottomY int, poc game.PileOfCards) *PocList {
 	w := &PocList{
 		TextBox: TextBox{
 			WidgetBase: NewWidgetBase(-1, -1, -1, -1),
-			Text:       "",
+			text:       "",
 			Fg:         TEXTBOX_DEFAULT_FOREGROUND,
 			Bg:         TEXTBOX_DEFAULT_BACKGROUND,
 			XMargin:    TEXTBOX_DEFAULT_MARGIN,
@@ -139,12 +134,12 @@ func (w *PocList) setText() {
 	}
 
 	if t != "" {
-		w.Text = t[:len(t)-1]
+		w.text = t[:len(t)-1]
 	} else {
-		w.Text = "No cards"
+		w.text = "No cards"
 	}
 
-	b := text.BoundString(font.Font24, w.Text)
+	b := text.BoundString(font.Font24, w.text)
 	w.X = w.centerX - b.Dx()/2 - w.XMargin
 	w.Y = w.bottomY - b.Dy() - w.YMargin
 }
@@ -159,3 +154,43 @@ func (w *PocList) FindObjectAt(x, y int) interface{} {
 	// i := b.Dy() / w.poc.Size()
 	return cards[0]
 }
+
+type TextInput struct {
+	TextBox
+	input string
+	label string
+}
+
+func NewTextInput(x, y int, width, height int, label string) *TextInput {
+	w := &TextInput{*NewCenteringFixedTextBox(x, y, width, height, ""), "", label}
+
+	w.renderImpl = func() *ebiten.Image {
+		if w.input == "" {
+			w.text = w.label
+		} else {
+			w.text = w.input
+		}
+
+		return w.render()
+	}
+
+	return w
+}
+
+func (ti *TextInput) AddInput(input []rune) {
+	ti.input += string(input)
+	ti.ForceRedraw()
+}
+
+func (ti *TextInput) HandleKey() {
+	if inpututil.IsKeyJustPressed(ebiten.KeyBackspace) {
+		if len(ti.input) > 0 {
+			ti.input = ti.input[:len(ti.input)-1]
+			ti.ForceRedraw()
+		}
+	}
+}
+
+func (ti *TextInput) Text() string {
+	return ti.input
+}
diff --git a/go/ui/textInput.go b/go/ui/textInput.go
new file mode 100644
index 00000000..5b1faa29
--- /dev/null
+++ b/go/ui/textInput.go
@@ -0,0 +1 @@
+package ui
diff --git a/go/ui/utils.go b/go/ui/utils.go
new file mode 100644
index 00000000..fd15b642
--- /dev/null
+++ b/go/ui/utils.go
@@ -0,0 +1,19 @@
+package ui
+
+import (
+	"image"
+)
+
+func centerTextXOffset(b image.Rectangle) int {
+	return (b.Dx() / 2) - b.Min.X
+}
+
+func centerTextYOffset(b image.Rectangle) int {
+	return (b.Dy() / 2) + b.Min.Y
+}
+
+func centerText(b image.Rectangle) (x int, y int) {
+	x = centerTextXOffset(b)
+	y = centerTextYOffset(b)
+	return
+}