CViewportNode Class

class CViewportNode: public CDCLayoutBase

Implementation of the IViewportNode interface.
Provides integration of the Layout Manager service with the MVC architecture, by allowing MVC windowless viewports to participate in layout operations.

Defined in: ViewportNode.h

Comments

There are two types of viewports in MVC: windowed viewports and windowless viewports. The former are implemented as real windows, so they can be attached to standard window layout nodes. Windowless viewports draw directly on the area of their master window, they do not have a window of their own. This characteristic is very similar to the functionality  CDCLayoutBase offers in the context of the layout manager. CViewportNode specializes CDCLayoutBase by delegating the painting processes to the corresponding IVisual methods, and performing the appropiate steps in RealizeNode to assign the new area to the viewport.