Determines the 'mouseAction' from the 'hitTestArea'. It respects the restrictions set
for the MDI view. If the MDI view has set the MDI_NOT_RESIZABLE flag, no resize
operation is started etc.
Possible values for 'hitTestArea':
MDI_NC_NONE |
Invalid point. |
MDI_NC_SIZE_EDGE |
Mouse is over the resize edge. Starts a resize operation. |
MDI_NC_BORDER |
Mouse is over the border. A double click minimizes the view,
a single click starts a move operation. |
MDI_NC_CLOSE_BOX |
Mouse is over the close box.
This value is ignored by this class. |
MDI_NC_MAXIMIZE_BOX |
Mouse is over the maximize box. Ignored. |
MDI_NC_TITLE_TAB |
Mouse is over the title tab. This class handles this
value like MDI_NC_BORDER. |