All selectable TextBoxes have keyboard controls

internal/system/textbox.go

@@ -24,6 +24,7 @@ type textBox struct {
 	attrOverflow  attrHierarchy[tomo.AttrOverflow]
 
 	text        string
+	runes       []rune
 	selectable  bool
 	selecting   bool
 	selectStart int
@@ -70,8 +71,9 @@ func (this *textBox) OnContentBoundsChange (callback func()) event.Cookie {
 
 func (this *textBox) SetText (text string) {
 	if this.text == text { return }
-	this.text = text
-	this.drawer.SetText([]rune(text))
+	this.text  = text
+	this.runes = []rune(text)
+	this.drawer.SetText(this.runes)
 	this.invalidateMinimum()
 	this.invalidateLayout()
 }
@@ -286,6 +288,71 @@ func (this *textBox) runeUnderMouse () int {
 	return this.drawer.AtPosition(fixPt(position))
 }
 
+func (this *textBox) handleKeyDown (key input.Key, numberPad bool) bool {
+	if this.box.handleKeyDown(key, numberPad) { return true  }
+	if this.selectable                        { return false }
+
+	// because fuck you thats why!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+	modifiers := this.Window().Modifiers()
+	dot       := this.Dot()
+	sel       := modifiers.Shift
+	word      := modifiers.Control
+	switch {
+	case key == input.KeyHome || (modifiers.Alt && key == input.KeyLeft):
+		dot.End = 0
+		if !sel { dot.Start = dot.End }
+		this.Select(dot)
+		return true
+	case key == input.KeyEnd || (modifiers.Alt && key == input.KeyRight):
+		dot.End = len(this.text)
+		if !sel { dot.Start = dot.End }
+		this.Select(dot)
+		return true
+	case key == input.KeyLeft:
+		if sel {
+			this.Select(text.SelectLeft(this.runes, dot, word))
+		} else {
+			this.Select(text.MoveLeft(this.runes, dot, word))
+		}
+		return true
+	case key == input.KeyRight:
+		if sel {
+			this.Select(text.SelectRight(this.runes, dot, word))
+		} else {
+			this.Select(text.MoveRight(this.runes, dot, word))
+		}
+		return true
+	case key == input.Key('a') && modifiers.Control:
+		dot.Start = 0
+		dot.End   = len(this.text)
+		this.Select(dot)
+		return true
+	default:
+		return false
+	}
+}
+
+func (this *textBox) handleKeyUp (key input.Key, numberPad bool) bool {
+	if this.box.handleKeyUp(key, numberPad) { return true  }
+	if this.selectable                      { return false }
+	
+	modifiers := this.Window().Modifiers()
+	switch {
+	case key == input.KeyHome || (modifiers.Alt && key == input.KeyLeft):
+		return true
+	case key == input.KeyEnd || (modifiers.Alt && key == input.KeyRight):
+		return true
+	case key == input.KeyLeft:
+		return true
+	case key == input.KeyRight:
+		return true
+	case key == input.Key('a') && modifiers.Control:
+		return true
+	default:
+		return false
+	}
+}
+
 func (this *textBox) normalizedLayoutBoundsSpace () image.Rectangle {
 	bounds := this.drawer.LayoutBoundsSpace()
 	return bounds.Sub(bounds.Min)