Additional primitives/widgets

[bugadani]

• Scroll[Listener?] (Scroll widget #17)
  Reacts to pointer and scroll events, translates child widgets along the set axis. Sets clipping rectangle.
  Scroll offset should be r/w
  Optional over-scroll handlers?
• CheckBox, RadioButton (Toggle switch #21)
• Slider, scrollbar (Slider widget #27)
  Multiple types: point selector, interval selector, fixed width interval selector (i.e. scrollbar)
• Text input (Editable text box #50)
  This should probably be an even listener similar to button - set state (based on selection) and have no inherent graphics. Alternative is a complex textbox with cursor. Moving the cursor using pointer events will be fun.
  e-g backend implements using embedded-text, Some way of streaming input or the ability to inject tokens externally embedded-graphics/embedded-text#60 could help.
• Tabs/pages - kinda-sorta possible using Visibility and Toggle buttons
• Layer container
  Has implications on rendering
• Canvas widget - draw embedded-graphics primitives

Longer term possibilities:

• Switch
  Not quite a Toggle because it might need to handle drag events to be fancy. Figure out how to bubble up toggle requests?
• Templated list
  This might be a tricky one.
• Image
• Cascading menu
• Window (resizeable, movable - closable?)
• Resizeable panels (draggable separator)