CellSelector

Section: ET++ class description (n)
Updated: automatically Mon Apr 8 20:18:15 1991
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NAME

CellSelector - selection of cells of a CollectionView

DESCRIPTION

The CellSelector selects single cells of a CollectionView.
Instances of CellSelector are created by the method CollectionView::DoLeftButtonDownCommmand. As long as the mouse button is pressed and the mouse is moved the CellSelector updates the selection of the CollectionView and calls the method CollectionView::DoOnItem. When the mouse button is released it passes the final selection to the method CollectionView::DoSelect2.

classes are rarely derived from CellSelector.
class CellSelector is heavily reused directly.
class CellSelector contains 3 methods.

owner of class:: nobody.
baseclasses:: Command
flags:: CommandFlags

INSTANCE VARIABLES

clickCount (private int)

contains how often the mouse button has been clicked when the CellSelector is created by the method CollectionView::DoLeftButtonDownCommmand. It is stored here only to be able to pass the number of clicks to the method CollectionView::DoSelect2 when the CellSelector finishes. See method TrackMouse.

item (private Point)

contains the column and row number of the currently selected cell

itemptr (private VObject *)

refers to the item in the currently selected cell

lvp (private CollectionView *)

a reference to the associated CollectionView. See class CollectionView.

INSTANCE METHOD LIST

client interface: CellSelector
miscellaneous: TrackFeedback
TrackMouse

FILES

declaration:: CollView.h

KNOWN PROBLEMS

1. It is impossible to select more than one cell concurrently though the class CollectionView would allow this.
2. Because all instance variables are private it is neither possible to implement selection of multiple cells in a subclass.

HISTORY

joe@csesbg.at Mon Jul 01 18:00 1991

man2html: unable to open or read file ../mann/CellSelector::CellSelector.n

man2html: unable to open or read file ../mann/CellSelector::TrackFeedback.n

man2html: unable to open or read file ../mann/CellSelector::TrackMouse.n

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