Demonstrates how shortcuts, Intents, and Actions can be used to bind mouse and keyboard events to application behavior.

• Define shortcuts for the arrow keys which move the selected item. Control and shift modifiers should change the motions incremental x,y delta. If no item is selected, then the up/down arrow keys should scroll.
• Define shortcuts that move the selection to the next/previous item.
• Define an Action that means "addItemAt" and create a shortcut (maybe for space) that adds the Item somewhere that's not too surprising.
• Define an Action that deletes the selected item and create delete and backspace shortcuts for it.
• Define a way to bind mouse gestures to actions, notably "addItemAt" and "selectItemAt".
• Enable moving the focus to items and enable editing their labels.
• Support dragging items with the mouse.
• Support adding resize-handles to items (double click or long tap) and changing their size.
• Enable moving the selected item with the "w a s d" keyboard keys, as in many games.
• Enable multiple selection.
• Z-order: send forward/backwards to-front/to-back.
• Enable changing the selected item's color.
• Shortcuts that rearrange the items' layout in rows/columns (animation!).