Offload selection manipulation of TextInput to backend

textinput.go

@@ -66,57 +66,57 @@ func (this *TextInput) handleKeyDown (key input.Key, numpad bool) bool {
 	dot       := this.Dot()
 	modifiers := this.Window().Modifiers()
 	word      := modifiers.Control
-	sel       := modifiers.Shift
 	changed   := false
 
-	// TODO all dot control (movement, selection, etc) should be done in the
-	// backend. (editing should be done here, though)
+	defer func () {
+		this.Select(dot)
+		if changed {
+			this.SetText(string(this.text))
+			this.on.valueChange.Broadcast()
+		}
+	} ()
 
 	switch {
 	case key == input.KeyEnter:
 		this.on.confirm.Broadcast()
-	case key == input.KeyHome || (modifiers.Alt && key == input.KeyLeft):
-		dot.End = 0
-		if !sel { dot.Start = dot.End }
-	case key == input.KeyEnd || (modifiers.Alt && key == input.KeyRight):
-		dot.End = len(this.text)
-		if !sel { dot.Start = dot.End }
-	case key == input.KeyLeft:
-		if sel {
-			dot = text.SelectLeft(this.text, dot, word)
-		} else {
-			dot = text.MoveLeft(this.text, dot, word)
-		}
-	case key == input.KeyRight:
-		if sel {
-			dot = text.SelectRight(this.text, dot, word)
-		} else {
-			dot = text.MoveRight(this.text, dot, word)
-		}
+		return true
 	case key == input.KeyBackspace:
 		this.text, dot = text.Backspace(this.text, dot, word)
 		changed = true
+		return true
 	case key == input.KeyDelete:
 		this.text, dot = text.Delete(this.text, dot, word)
 		changed = true
+		return true
 	case key == input.Key('a') && modifiers.Control:
 		dot.Start = 0
 		dot.End   = len(this.text)
+		return true
 	case key.Printable():
 		this.text, dot = text.Type(this.text, dot, rune(key))
 		changed = true
+		return true
+	default:
+		return false
 	}
-
-	this.Select(dot)
-	if changed {
-		this.SetText(string(this.text))
-		this.on.valueChange.Broadcast()
-	}
-	return true
 }
 
 func (this *TextInput) handleKeyUp (key input.Key, numpad bool) bool {
-	return true
+	modifiers := this.Window().Modifiers()
+	switch {
+	case key == input.KeyEnter:
+		return true
+	case key == input.KeyBackspace:
+		return true
+	case key == input.KeyDelete:
+		return true
+	case key == input.Key('a') && modifiers.Control:
+		return true
+	case key.Printable():
+		return true
+	default:
+		return false
+	}
 }
 
 func (this *TextInput) handleScroll (x, y float64) bool {