I am a controller for SceneViews. I support gestures for scrolling, click-selection, and area selection of scene glyphs. (See the class comment in GestureController for more details about gestures.) I also support construction operations such as inserting new glyphs and merging glyphs to make them share a common point.

The mapping of gestures to actions is as follows (see GestureController comment for more about gestures):

Click:
click on glyph select glyph
shift-click on glyph toggle selection of that glyph
click on background clear selection
Double click:
double-click on glyph inspect glyph
double-click on background select all
Hold/Drag/Sweep:
hold (no movement) yellow-button menu
drag (up/left movement) scrolling hand
sweep (down/right movement) select glyphs in region
shift-sweep toggle selection of glyphs in region

	control sequence	top
	controlActivity Do one step of the Morphic interaction loop. Called repeatedly while window is active.
	controlInitialize This window is becoming active.
	controlLoop Overridden to keep control active when the hand goes out of the view
	controlTerminate This window is becoming inactive; restore the normal cursor.
	isControlActive Answer whether receiver wishes to continue evaluating its controlLoop method. It is sent by Controller|controlLoop in order to determine when the receiver's control loop should terminate, and should be redefined in a subclass if some special condition for terminating the main control loop is needed.