Package draw.controller.handler

Adapts low-level mouse events to events relevant for the application-domain.

See: Description

Class Summary

Class	Description
ActiveToolHandler	Adapts mouse events into actions, corresponding to IActionInterface, based on the active tool.
ChangeCursorHandler	React to anchor points on MouseMotion with changing cursor; thereafter, handle dragging behavior.
CreateHandler
DrawerMouseAdapter	GUI Handlers are able to draw into the graphics after all elements have been redrawn.
Handler	Handler for Chain of Responsibilities.
ResizeHandler	React to anchor points on MouseMotion by resizing.
SelectHandler

Package draw.controller.handler Description

Adapts low-level mouse events to events relevant for the application-domain. We want to be able to support a number of expected user experiences that are common in applications. These include reacting to mouse events intuitively and changing the cursor in response to potential events. Instead of wallowing in complex mouse handlers, the classes in this package provide a consistent API to allow new behaviors to easily be added to the initially defined ones. IActionInterface provides the application-domain events of interest, including:

1. Move -- when the user moves the mouse, potentially with key modifiers down but no button pressed.
2. Anchor actions
   1. startAnchor -- press mouse over an anchor for an element
   2. dragAnchor -- drag mouse down to continue action
   3. completeAnchor -- release mouse
3. Empty actions
   1. start -- press mouse over a possible element
   2. drag -- drag mouse down to continue action
   3. complete -- release mouse

To be able to produce these events, the ActiveToolHandler class takes the responsibility of adapting low-level mouse events into application-domain events.

Since:

1.0