105 lines
3.8 KiB
C++
105 lines
3.8 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Name: wx/selstore.h
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// Purpose: wxSelectionStore stores selected items in a control
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// Author: Vadim Zeitlin
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// Modified by:
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// Created: 08.06.03 (extracted from src/generic/listctrl.cpp)
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// RCS-ID: $Id: selstore.h 29257 2004-09-22 14:38:52Z ABX $
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// Copyright: (c) 2000-2003 Vadim Zeitlin <vadim@wxwidgets.org>
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// Licence: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_SELSTORE_H_
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#define _WX_SELSTORE_H_
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#include "wx/dynarray.h"
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// ----------------------------------------------------------------------------
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// wxSelectedIndices is just a sorted array of indices
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// ----------------------------------------------------------------------------
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inline int CMPFUNC_CONV wxSizeTCmpFn(size_t n1, size_t n2)
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{
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return (int)(n1 - n2);
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}
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WX_DEFINE_SORTED_EXPORTED_ARRAY_CMP_SIZE_T(size_t,
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wxSizeTCmpFn,
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wxSelectedIndices);
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// ----------------------------------------------------------------------------
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// wxSelectionStore is used to store the selected items in the virtual
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// controls, i.e. it is well suited for storing even when the control contains
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// a huge (practically infinite) number of items.
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//
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// Of course, internally it still has to store the selected items somehow (as
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// an array currently) but the advantage is that it can handle the selection
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// of all items (common operation) efficiently and that it could be made even
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// smarter in the future (e.g. store the selections as an array of ranges +
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// individual items) without changing its API.
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// ----------------------------------------------------------------------------
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class WXDLLEXPORT wxSelectionStore
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{
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public:
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wxSelectionStore() : m_itemsSel(wxSizeTCmpFn) { Init(); }
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// set the total number of items we handle
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void SetItemCount(size_t count) { m_count = count; }
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// special case of SetItemCount(0)
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void Clear() { m_itemsSel.Clear(); m_count = 0; m_defaultState = false; }
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// must be called when a new item is inserted/added
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void OnItemAdd(size_t WXUNUSED(item)) { wxFAIL_MSG( _T("TODO") ); }
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// must be called when an item is deleted
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void OnItemDelete(size_t item);
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// select one item, use SelectRange() insted if possible!
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//
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// returns true if the items selection really changed
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bool SelectItem(size_t item, bool select = true);
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// select the range of items
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//
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// return true and fill the itemsChanged array with the indices of items
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// which have changed state if "few" of them did, otherwise return false
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// (meaning that too many items changed state to bother counting them
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// individually)
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bool SelectRange(size_t itemFrom, size_t itemTo,
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bool select = true,
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wxArrayInt *itemsChanged = NULL);
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// return true if the given item is selected
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bool IsSelected(size_t item) const;
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// return the total number of selected items
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size_t GetSelectedCount() const
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{
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return m_defaultState ? m_count - m_itemsSel.GetCount()
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: m_itemsSel.GetCount();
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}
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private:
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// (re)init
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void Init() { m_defaultState = false; }
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// the total number of items we handle
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size_t m_count;
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// the default state: normally, false (i.e. off) but maybe set to true if
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// there are more selected items than non selected ones - this allows to
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// handle selection of all items efficiently
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bool m_defaultState;
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// the array of items whose selection state is different from default
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wxSelectedIndices m_itemsSel;
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DECLARE_NO_COPY_CLASS(wxSelectionStore)
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};
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#endif // _WX_SELSTORE_H_
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