Add TextView, improved Scrollbar

input.go

@@ -20,6 +20,7 @@ type TextInput struct {
 func NewTextInput (text string) *TextInput {
 	this := &TextInput { TextBox: tomo.NewTextBox() }
 	theme.Apply(this, theme.R("objects", "TextInput", ""))
+	this.SetAlign(tomo.AlignStart, tomo.AlignMiddle)
 	this.SetText(text)
 	this.SetFocusable(true)
 	this.SetSelectable(true)
@@ -53,6 +54,9 @@ func (this *TextInput) handleKeyDown (key input.Key, numpad bool) {
 	sel       := modifiers.Shift
 	changed   := false
 
+	// TODO all this (except editing stuff) really should be moved into the
+	// backend
+
 	switch {
 	case key == input.KeyEnter:
 		this.on.enter.Broadcast()