158 lines
4.5 KiB
C++
158 lines
4.5 KiB
C++
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/**********************************************************************/
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/** Microsoft Windows/NT **/
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/** Copyright(c) Microsoft Corp., 1991 **/
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/**********************************************************************/
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/*
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bltlbsel.hxx
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Selections within listboxen - class definitions
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FILE HISTORY:
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beng 06-Aug-1991 Created
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*/
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#ifndef _BLT_HXX_
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#error "Don't include this file directly; instead, include it through blt.hxx"
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#endif // _BLT_HXX_
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#ifndef _BLTLBSEL_HXX_
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#define _BLTLBSEL_HXX_
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#if 0 // DEAD
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/******************************************************************
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NAME: LB_SELECTION
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SYNOPSIS: Represents the set of lines selected in a listbox.
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INTERFACE:
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LB_SELECTION() - given a listbox, builds the current selection
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in that listbox.
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Select() - adds an existing element (identified by index)
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to the selection. I.e., selects the element.
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This would be "Add" to a collection.
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Unselect() - removes an existing selected element (id'd by
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index) from the selection. I.e., deselects
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the element. This would be "Remove" to a coll.
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UnselectAll() - removes every element from the selection.
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Listbox has no selection.
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AddItem() - adds a new element to the listbox, and leaves
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it selected. The difference between adding the
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item here and adding it at the listbox is
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that this selects the new item.
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DeleteAllItems()- completely empties the listbox of every item
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currently selected.
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QueryCount() - return the number of items selected.
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Redundant, given LISTBOX::QuerySelCount,
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yet convenient.
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PARENT: BASE
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USES: BLT_LISTBOX, ITER_LB
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CAVEATS:
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At any time a listbox may have no more than one SELECTION
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object in existence. More may lead to bad behavior, esp. if
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each calls DeleteAllItems or some such.
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NOTES:
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Placing the SELECTION attributes in a separate class lets the
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class allocate the (potentially large) set of selected records
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only when needed.
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The selection uses a "collection" metaphor, which is a bit
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confusing when juxtaposed against AddItem and such which work
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on the underlying collection of LBI*.
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HISTORY:
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beng 06-Aug-1991 Created
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**********************************************************************/
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DLL_CLASS LB_SELECTION: public BASE
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{
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friend LB_ITER;
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private:
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BLT_LISTBOX* _plb;
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UINT _cilbSelected;
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INT * _pilbSelected;
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public:
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LB_SELECTION( BLT_LISTBOX * );
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UINT QueryCount() const;
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VOID Select(INT)
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VOID Unselect(INT);
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VOID UnselectAll();
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INT AddItem(const LBI*);
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VOID DeleteAllItems();
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};
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/*************************************************************************
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NAME: ITER_LB
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SYNOPSIS: Step through the lines of a listbox
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INTERFACE:
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ITER_LB() - Construct the iterator. Can take either a listbox
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proper, in which case it steps through every line,
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or else a selection, in which case it steps through
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only those lines selected.
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Reset() - as usual for iterator
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operator()
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Next() - as usual for iterator, returning a LBI*.
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UnselectThis() - unselects the *current* line (the one just returned
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by Next). This will remove it from a selection.
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DeleteThis()- deletes the *current* line from the listbox.
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USES: LBI
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CAVEATS:
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The usual warnings apply about deleting items from a collection
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which has outstanding iterators. UnselectThis and DeleteThis
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are guaranteed safe on the current iterator, but no others.
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NOTES:
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HISTORY:
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beng 06-Aug-1991 Created
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**************************************************************************/
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DLL_CLASS ITER_LB
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{
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public:
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ITER_LB(const BLT_LISTBOX &);
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ITER_LB(const LB_SELECTION &);
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VOID Reset();
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LBI* Next();
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LBI* operator()() { return Next(); }
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VOID UnselectThis();
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VOID DeleteThis();
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};
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#endif // DEAD
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#endif // _BLTLBSEL_HXX_ - end of file
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