CanvasUser
So the descendant classes need to set the canv.mouseup field to use the mouse and its equivalents.
class Object
trait Matchable
class Any
class CanvasNoPanels
class CArcExs
class HelloWorld
class LsA1
class LsA10
class LsA11
class LsA12
class LsA13
class LsA1a
class LsA1b
class LsA2
class LsA3
class LsA3a
class LsA4
class LsA5
class LsA6
class LsA7
class LsA8
class LsA9
class LsB1
class LsB2
class LsB3
class LsC1
class LsC2
class LsC3
class LsC4
class LsC5
class LsC6
class LsC7
class LsC8
class LsD1
class LsD2
class LsD3
class LsD4
class LsD5
class BlackJackGui
class BattleGui
class FlagSelectorGUI
class FlagsGui
class ReactorGUI
class ColourGen
class CanvasPanelled
class CmdBarGui
class LsE1
class LsE2
class ChessGui
class DraughtsGui
class DungeonGui
class E80GridGuiOld
class EarthBasicGui
class ZugGuiOld
class TileMapGui
class HexMapGui
class EGridGui
class GOneGui
class GThreeGui
class AltReacGui
class CivGui
class ZugGui
class SquareMapGui
class GTwoGui
class MapGui
class UnfixedMapGui
class EarthGuiOld
class BC305Gui
class EarthAllGuiOld
class Y1783GuiOld
class WWIIGuiOld
class PlanetsGui