Fix the equality operator

[amule.git] / src / MuleListCtrl.cpp

//
// This file is part of the aMule Project.
//
// Copyright (c) 2003-2011 aMule Team ( admin@amule.org / http://www.amule.org )
// Copyright (c) 2002 Merkur ( devs@emule-project.net / http://www.emule-project.net )
//
// Any parts of this program derived from the xMule, lMule or eMule project,
// or contributed by third-party developers are copyrighted by their
// respective authors.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
//

#include <wx/menu.h>                    // Needed for wxMenu
#include <wx/fileconf.h>                // Needed for wxConfig
#include <wx/tokenzr.h>                 // Needed for wxStringTokenizer
#include <wx/imaglist.h>                // Needed for wxImageList

#include <common/MuleDebug.h>                   // Needed for MULE_VALIDATE_
#include <common/StringFunctions.h>             // Needed for StrToLong

#include <common/MenuIDs.h>

#include "MuleListCtrl.h"               // Interface declarations
#include "GetTickCount.h"               // Needed for GetTickCount()
#include "OtherFunctions.h"


// For arrow-pixmaps
#include "pixmaps/sort_dn.xpm"
#include "pixmaps/sort_up.xpm"
#include "pixmaps/sort_dnx2.xpm"
#include "pixmaps/sort_upx2.xpm"


// Global constants
#ifdef __WXGTK__
        const int COL_SIZE_MIN = 10;
#elif defined(__WINDOWS__) || defined(__WXMAC__) || defined(__WXCOCOA__)
        const int COL_SIZE_MIN = 0;
#else
        #error Need to define COL_SIZE_MIN for your OS
#endif


BEGIN_EVENT_TABLE(CMuleListCtrl, MuleExtern::wxGenericListCtrl)
        EVT_LIST_COL_CLICK( -1,                 CMuleListCtrl::OnColumnLClick)
        EVT_LIST_COL_RIGHT_CLICK( -1,   CMuleListCtrl::OnColumnRClick)
        EVT_LIST_ITEM_SELECTED(-1,              CMuleListCtrl::OnItemSelected)
        EVT_LIST_ITEM_DESELECTED(-1,    CMuleListCtrl::OnItemSelected)
        EVT_LIST_DELETE_ITEM(-1,                CMuleListCtrl::OnItemDeleted)
        EVT_LIST_DELETE_ALL_ITEMS(-1,   CMuleListCtrl::OnAllItemsDeleted)
        EVT_CHAR(                                               CMuleListCtrl::OnChar)
        EVT_MENU_RANGE(MP_LISTCOL_1, MP_LISTCOL_15, CMuleListCtrl::OnMenuSelected)
        EVT_MOUSEWHEEL(CMuleListCtrl::OnMouseWheel)
END_EVENT_TABLE()


//! Shared list of arrow-pixmaps
static wxImageList imgList(16, 16, true, 0);


CMuleListCtrl::CMuleListCtrl(wxWindow *parent, wxWindowID winid, const wxPoint& pos, const wxSize& size, long style, const wxValidator& validator, const wxString& name)
        : MuleExtern::wxGenericListCtrl(parent, winid, pos, size, style, validator, name)
{
        m_sort_func = NULL;
        m_tts_time = 0;
        m_tts_item = -1;
        m_isSorting = false;

        if (imgList.GetImageCount() == 0) {
                imgList.Add(wxBitmap(sort_dn_xpm));
                imgList.Add(wxBitmap(sort_up_xpm));
                imgList.Add(wxBitmap(sort_dnx2_xpm));
                imgList.Add(wxBitmap(sort_upx2_xpm));
        }

        // Default sort-order is to sort by the first column (asc).
        m_sort_orders.push_back(CColPair(0, 0));

        SetImageList(&imgList, wxIMAGE_LIST_SMALL);
}


CMuleListCtrl::~CMuleListCtrl()
{
        if (!m_name.IsEmpty()) {
                SaveSettings();
        }
}

long CMuleListCtrl::InsertColumn(long col, const wxString& heading, int format, int width, const wxString& name)
{
        if (!name.IsEmpty()) {
#ifdef __DEBUG__
                // Check for valid names
                wxASSERT_MSG(name.Find(wxT(':')) == wxNOT_FOUND, wxT("Column name \"") + name + wxT("\" contains invalid characters!"));
                wxASSERT_MSG(name.Find(wxT(',')) == wxNOT_FOUND, wxT("Column name \"") + name + wxT("\" contains invalid characters!"));

                // Check for uniqueness of names.
                for (ColNameList::const_iterator it = m_column_names.begin(); it != m_column_names.end(); ++it) {
                        if (name == it->name) {
                                wxFAIL_MSG(wxT("Column name \"") + name + wxT("\" is not unique!"));
                        }
                }
#endif
                // Insert name at position col.
                ColNameList::iterator it = m_column_names.begin();
                while (it != m_column_names.end() && it->index < col) {
                        ++it;
                }
                m_column_names.insert(it, ColNameEntry(col, width, name));
                while (it != m_column_names.end()) {
                        ++it;
                        ++(it->index);
                }
        }

        return MuleExtern::wxGenericListCtrl::InsertColumn(col, heading, format, width);
}

void CMuleListCtrl::SaveSettings()
{
        wxCHECK_RET(!m_name.IsEmpty(), wxT("Cannot save settings for unnamed list"));

        wxConfigBase* cfg = wxConfigBase::Get();

        // Save sorting, column and order
        wxString sortOrder;
        for (CSortingList::iterator it = m_sort_orders.begin(); it != m_sort_orders.end();) {
                wxString columnName = GetColumnName(it->first);
                if (!columnName.IsEmpty()) {
                        sortOrder += columnName;
                        sortOrder += wxT(":");
                        sortOrder += it->second & SORT_DES ? wxT("1") : wxT("0");
                        sortOrder += wxT(":");
                        sortOrder += it->second & SORT_ALT ? wxT("1") : wxT("0");
                        if (++it != m_sort_orders.end()) {
                                sortOrder += wxT(",");
                        }
                } else {
                        ++it;
                }
        }

        cfg->Write(wxT("/eMule/TableOrdering") + m_name, sortOrder);

        // Save column widths. ATM this is also used to signify hidden columns.
        wxString buffer;
        for (int i = 0; i < GetColumnCount(); ++i) {
                wxString columnName = GetColumnName(i);
                if (!columnName.IsEmpty()) {
                        if (!buffer.IsEmpty()) {
                                buffer << wxT(",");
                        }
                        int currentwidth = GetColumnWidth(i);
                        int savedsize = (m_column_sizes.size() && (i < (int) m_column_sizes.size())) ? m_column_sizes[i] : 0;
                        buffer << columnName << wxT(":") << ((currentwidth > 0) ? currentwidth : (-1 * savedsize));
                }
        }

        cfg->Write(wxT("/eMule/TableWidths") + m_name, buffer);
}

void CMuleListCtrl::ParseOldConfigEntries(const wxString& sortOrders, const wxString& columnWidths)
{
        // Set sort order (including sort column)
        wxStringTokenizer tokens(sortOrders, wxT(","));
        while (tokens.HasMoreTokens()) {
                wxString token = tokens.GetNextToken();

                long column = 0;
                unsigned long order = 0;

                if (token.BeforeFirst(wxT(' ')).Strip(wxString::both).ToLong(&column)) {
                        if (token.AfterFirst(wxT(' ')).Strip(wxString::both).ToULong(&order)) {
                                column = GetNewColumnIndex(column);
                                // Sanity checking, to avoid asserting if column count changes.
                                if (column >= 0 && column < GetColumnCount()) {
                                        // Sanity checking, to avoid asserting if data-format changes.
                                        if ((order & ~SORTING_MASK) == 0) {
                                                // SetSorting will take care of duplicate entries
                                                SetSorting(column, order);
                                        }
                                }
                        }
                }
        }

        // Set column widths
        int counter = 0;
        wxStringTokenizer tokenizer(columnWidths, wxT(","));
        while (tokenizer.HasMoreTokens()) {
                long idx = GetNewColumnIndex(counter++);
                long width = StrToLong(tokenizer.GetNextToken());
                if (idx >= 0) {
                        SetColumnWidth(idx, width);
                }
        }
}

void CMuleListCtrl::LoadSettings()
{
        wxCHECK_RET(!m_name.IsEmpty(), wxT("Cannot load settings for unnamed list"));

        wxConfigBase* cfg = wxConfigBase::Get();

        // Load sort order (including sort-column)
        m_sort_orders.clear();
        wxString sortOrders = cfg->Read(wxT("/eMule/TableOrdering") + m_name, wxEmptyString);
        wxString columnWidths = cfg->Read(wxT("/eMule/TableWidths") + m_name, wxEmptyString);

        // Prevent sorting from occuring when calling SetSorting
        MuleListCtrlCompare sortFunc = m_sort_func;
        m_sort_func = NULL;

        if (columnWidths.Find(wxT(':')) == wxNOT_FOUND) {
                // Old-style config entries...
                ParseOldConfigEntries(sortOrders, columnWidths);
        } else {
                // Sort orders
                wxStringTokenizer tokens(sortOrders, wxT(","));
                // Sort orders are stored in order primary, secondary, ...
                // We want to apply them with SetSorting(), so we have to apply them in reverse order,
                // so that the primary order is applied last and wins.
                // Read them with tokenizer and store them in a list in reverse order.
                CStringList tokenList;
                while (tokens.HasMoreTokens()) {
                        tokenList.push_front(tokens.GetNextToken());
                }
                for (CStringList::iterator it = tokenList.begin(); it != tokenList.end(); ++it) {
                        wxString token = *it;
                        wxString name = token.BeforeFirst(wxT(':'));
                        long order = StrToLong(token.AfterFirst(wxT(':')).BeforeLast(wxT(':')));
                        long alt = StrToLong(token.AfterLast(wxT(':')));
                        int col = GetColumnIndex(name);
                        if (col >= 0) {
                                SetSorting(col, (order ? SORT_DES : 0) | (alt ? SORT_ALT : 0));
                        }
                }

                // Column widths
                wxStringTokenizer tkz(columnWidths, wxT(","));
                while (tkz.HasMoreTokens()) {
                        wxString token = tkz.GetNextToken();
                        wxString name = token.BeforeFirst(wxT(':'));
                        long width = StrToLong(token.AfterFirst(wxT(':')));
                        int col = GetColumnIndex(name);
                        if (col >= 0) {
                                if (col >= (int) m_column_sizes.size()) {
                                        m_column_sizes.resize(col + 1, 0);
                                }
                                m_column_sizes[col] = abs(width);
                                SetColumnWidth(col, (width > 0) ? width : 0);
                        }
                }
        }

        // Must have at least one sort-order specified
        if (m_sort_orders.empty()) {
                m_sort_orders.push_back(CColPair(0, 0));
        }

        // Re-enable sorting and resort the contents (if any).
        m_sort_func = sortFunc;
        SortList();
}


const wxString& CMuleListCtrl::GetColumnName(int index) const
{
        for (ColNameList::const_iterator it = m_column_names.begin(); it != m_column_names.end(); ++it) {
                if (it->index == index) {
                        return it->name;
                }
        }
        return EmptyString;
}

int CMuleListCtrl::GetColumnDefaultWidth(int index) const
{
        for (ColNameList::const_iterator it = m_column_names.begin(); it != m_column_names.end(); ++it) {
                if (it->index == index) {
                        return it->defaultWidth;
                }
        }
        return wxLIST_AUTOSIZE;
}

int CMuleListCtrl::GetColumnIndex(const wxString& name) const
{
        for (ColNameList::const_iterator it = m_column_names.begin(); it != m_column_names.end(); ++it) {
                if (it->name == name) {
                        return it->index;
                }
        }
        return -1;
}

int CMuleListCtrl::GetNewColumnIndex(int oldindex) const
{
        wxStringTokenizer oldcolumns(GetOldColumnOrder(), wxT(","), wxTOKEN_RET_EMPTY_ALL);

        while (oldcolumns.HasMoreTokens()) {
                wxString name = oldcolumns.GetNextToken();
                if (oldindex == 0) {
                        return GetColumnIndex(name);
                }
                --oldindex;
        }
        return -1;
}

long CMuleListCtrl::GetInsertPos(wxUIntPtr data)
{
        // Find the best place to position the item through a binary search
        int Min = 0;
        int Max = GetItemCount();

        // Only do this if there are any items and a sorter function.
        // Otherwise insert at end.
        if (Max && m_sort_func) {
                // This search will find the place to position the new item
                // so it matches current sorting.
                // The result will be the position the new item will have
                // after insertion, which is the format expected by the InsertItem function.
                // If the item equals another item it will be inserted after it.
                do {
                        int cur_pos = ( Max - Min ) / 2 + Min;
                        int cmp = CompareItems(data, GetItemData(cur_pos));

                        // Value is less than the one at the current pos
                        if ( cmp < 0 ) {
                                Max = cur_pos;
                        } else {
                                Min = cur_pos + 1;
                        }
                } while ((Min != Max));
        }

        return Max;
}


int CMuleListCtrl::CompareItems(wxUIntPtr item1, wxUIntPtr item2)
{
        CSortingList::const_iterator it = m_sort_orders.begin();
        for (; it != m_sort_orders.end(); ++it) {
                int result = m_sort_func(item1, item2, it->first | it->second);
                if (result != 0) {
                        return result;
                }
        }

        // Ensure that different items are never considered equal.
        return CmpAny(item1, item2);
}

int CMuleListCtrl::SortProc(wxUIntPtr item1, wxUIntPtr item2, long data)
{
        MuleSortData* sortdata = reinterpret_cast<MuleSortData*>(data);
        const CSortingList& orders = sortdata->m_sort_orders;

        CSortingList::const_iterator it = orders.begin();
        for (; it != orders.end(); ++it) {
                int result = sortdata->m_sort_func(item1, item2, it->first | it->second);
                if (result != 0) {
                        return result;
                }
        }

        // Ensure that different items are never considered equal.
        return CmpAny(item1, item2);
}

void CMuleListCtrl::SortList()
{
        if (!IsSorting() && (m_sort_func && GetColumnCount())) {

                m_isSorting = true;

                MuleSortData sortdata(m_sort_orders, m_sort_func);

                // In many cases control already has correct order, and sorting causes nasty flickering.
                // Make one pass through it to check if sorting is necessary at all.
                int nrItems = GetItemCount();
                bool clean = true;
                long lastItemdata = 0;
                if (nrItems > 1) {
                        lastItemdata = GetItemData(0);
                }
                for (int i = 1; i < nrItems; i++) {
                        long nextItemdata = GetItemData(i);
                        if (SortProc(lastItemdata, nextItemdata, (long int)&sortdata) > 0) {
                                // ok - we need to sort
                                clean = false;
                                break;
                        }
                        lastItemdata = nextItemdata;
                }
                if (clean) {
                        // no need to sort
                        m_isSorting = false;
                        return;
                }

                // Positions are likely to be invalid after sorting.
                ResetTTS();

                // Store the current selected items
                ItemDataList selectedItems = GetSelectedItems();
                // Store the focused item
                long pos = GetNextItem( -1, wxLIST_NEXT_ALL, wxLIST_STATE_FOCUSED );
                wxUIntPtr focused = (pos == -1) ? 0 : GetItemData(pos);

                SortItems(SortProc, (long int)&sortdata);

                // Re-select the selected items.
                for (unsigned i = 0; i < selectedItems.size(); ++i) {
                        long it_pos = FindItem(-1, selectedItems[i]);
                        if (it_pos != -1) {
                                SetItemState(it_pos, wxLIST_STATE_SELECTED, wxLIST_STATE_SELECTED);
                        }
                }

                // Set focus on item if any was focused
                if (focused) {
                        long it_pos = FindItem(-1, focused);
                        if (it_pos != -1) {
                                SetItemState(it_pos, wxLIST_STATE_FOCUSED, wxLIST_STATE_FOCUSED);
                        }
                }

                m_isSorting = false;
        }
}

CMuleListCtrl::ItemDataList CMuleListCtrl::GetSelectedItems() const
{
        // Create the initial vector with as many items as are selected
        ItemDataList list( GetSelectedItemCount() );

        // Current item being located
        unsigned int current = 0;

        long pos = GetNextItem( -1, wxLIST_NEXT_ALL, wxLIST_STATE_SELECTED );
        while ( pos != -1 ) {
                wxASSERT( current < list.size() );

                list[ current++ ] = GetItemData( pos );

                pos = GetNextItem( pos, wxLIST_NEXT_ALL, wxLIST_STATE_SELECTED );
        }

        return list;
}


void CMuleListCtrl::OnColumnRClick(wxListEvent& evt)
{
        wxMenu menu;
        wxListItem item;

        for ( int i = 0; i < GetColumnCount() && i < 15; ++i) {
                GetColumn(i, item);

                menu.AppendCheckItem(i + MP_LISTCOL_1, item.GetText() );
                menu.Check( i + MP_LISTCOL_1, GetColumnWidth(i) > COL_SIZE_MIN );
        }

        PopupMenu(&menu, evt.GetPoint());
}


void CMuleListCtrl::OnMenuSelected( wxCommandEvent& evt )
{
        unsigned int col = evt.GetId() - MP_LISTCOL_1;

        if (col >= m_column_sizes.size()) {
                m_column_sizes.resize(col + 1, 0);
        }

        if (GetColumnWidth(col) > COL_SIZE_MIN) {
                m_column_sizes[col] = GetColumnWidth(col);
                SetColumnWidth(col, 0);
        } else {
                int oldsize = m_column_sizes[col];
                SetColumnWidth(col, (oldsize > 0) ? oldsize : GetColumnDefaultWidth(col));
        }
}


void CMuleListCtrl::OnColumnLClick(wxListEvent& evt)
{
        // Stop if no sorter-function has been defined
        if (!m_sort_func) {
                return;
        } else if (evt.GetColumn() == -1) {
                // This happens if a user clicks past the last column header.
                return;
        }

        unsigned sort_order = 0;
        if (m_sort_orders.front().first == (unsigned)evt.GetColumn()) {
                // Same column as before, flip the sort-order
                sort_order = m_sort_orders.front().second;

                if (sort_order & SORT_DES) {
                        if (AltSortAllowed(evt.GetColumn())) {
                                sort_order = (~sort_order) & SORT_ALT;
                        } else {
                                sort_order = 0;
                        }
                } else {
                        sort_order = SORT_DES | (sort_order & SORT_ALT);
                }

                m_sort_orders.pop_front();
        } else {
                // Check if the column has already been set
                CSortingList::iterator it = m_sort_orders.begin();
                for (; it != m_sort_orders.end(); ++it) {
                        if ((unsigned)evt.GetColumn() == it->first) {
                                sort_order = it->second;
                                break;
                        }
                }
        }


        SetSorting(evt.GetColumn(), sort_order);
}


void CMuleListCtrl::ClearSelection()
{
        if (GetSelectedItemCount()) {
                long index = GetNextItem(-1, wxLIST_NEXT_ALL, wxLIST_STATE_SELECTED);
                while (index != -1) {
                        SetItemState(index, 0, wxLIST_STATE_SELECTED);
                        index = GetNextItem(index, wxLIST_NEXT_ALL, wxLIST_STATE_SELECTED);
                }
        }
}


bool CMuleListCtrl::AltSortAllowed(unsigned WXUNUSED(column)) const
{
        return false;
}


void CMuleListCtrl::SetSorting(unsigned column, unsigned order)
{
        MULE_VALIDATE_PARAMS(column < (unsigned)GetColumnCount(), wxT("Invalid column to sort by."));
        MULE_VALIDATE_PARAMS(!(order & ~SORTING_MASK), wxT("Sorting order contains invalid data."));

        if (!m_sort_orders.empty()) {
                SetColumnImage(m_sort_orders.front().first, -1);

                CSortingList::iterator it = m_sort_orders.begin();
                for (; it != m_sort_orders.end(); ++it) {
                        if (it->first == column) {
                                m_sort_orders.erase(it);
                                break;
                        }
                }
        }

        m_sort_orders.push_front(CColPair(column, order));

        if (order & SORT_DES) {
                SetColumnImage(column, (order & SORT_ALT) ? 2 : 0);
        } else {
                SetColumnImage(column, (order & SORT_ALT) ? 3 : 1);
        }

        SortList();
}


bool CMuleListCtrl::IsItemSorted(long item)
{
        wxCHECK_MSG(m_sort_func, true, wxT("No sort function specified!"));
        wxCHECK_MSG((item >= 0) && (item < GetItemCount()), true, wxT("Invalid item"));

        bool sorted = true;
        wxUIntPtr data = GetItemData(item);

        // Check that the item before the current item is smaller (or equal)
        if (item > 0) {
                sorted &= (CompareItems(GetItemData(item - 1), data) <= 0);
        }

        // Check that the item after the current item is greater (or equal)
        if (sorted && (item < GetItemCount() - 1)) {
                sorted &= (CompareItems(GetItemData(item + 1), data) >= 0);
        }

        return sorted;
}


void CMuleListCtrl::OnMouseWheel(wxMouseEvent &event)
{
        // This enables scrolling with the mouse wheel
        event.Skip();
}


void CMuleListCtrl::SetColumnImage(unsigned col, int image)
{
        wxListItem item;
        item.SetMask(wxLIST_MASK_IMAGE);
        item.SetImage(image);
        SetColumn(col, item);
}


long CMuleListCtrl::CheckSelection(wxMouseEvent& event)
{
        int flags = 0;
        wxListEvent evt;
        evt.m_itemIndex = HitTest(event.GetPosition(), flags);

        return CheckSelection(evt);
}


long CMuleListCtrl::CheckSelection(wxListEvent& event)
{
        long item = event.GetIndex();

        // Check if clicked item is selected. If not, unselect all and select it.
        if ((item != -1) && !GetItemState(item, wxLIST_STATE_SELECTED)) {
                ClearSelection();

                SetItemState(item, wxLIST_STATE_SELECTED, wxLIST_STATE_SELECTED);
        }

        return item;
}


wxString CMuleListCtrl::GetTTSText(unsigned item) const
{
        MULE_VALIDATE_PARAMS(item < (unsigned)GetItemCount(), wxT("Invalid row."));
        MULE_VALIDATE_STATE((GetWindowStyle() & wxLC_OWNERDRAW) == 0,
                wxT("GetTTSText must be overwritten for owner-drawn lists."));

        return GetItemText(item);
}


void CMuleListCtrl::OnChar(wxKeyEvent& evt)
{
        int key = evt.GetKeyCode();
        if (key == 0) {
                // We prefer GetKeyCode() to GetUnicodeKey(), in order to work
                // around a bug in the GetUnicodeKey(), that causes values to
                // be returned untranslated. This means for instance, that if
                // shift and '1' is pressed, the result is '1' rather than '!'
                // (as it should be on my keyboard). This has been reported:
                // http://sourceforge.net/tracker/index.php?func=detail&aid=1864810&group_id=9863&atid=109863
                key = evt.GetUnicodeKey();
        } else if (key >= WXK_START) {
                // wxKeycodes are ignored, as they signify events such as the 'home'
                // button. Unicoded chars are not checked as there is an overlap valid
                // chars and the wx keycodes.
                evt.Skip();
                return;
        }

        // We wish to avoid handling shortcuts, with the exception of 'select-all'.
        if (evt.AltDown() || evt.ControlDown() || evt.MetaDown()) {
                if (evt.CmdDown() && (evt.GetKeyCode() == 0x01)) {
                        // Ctrl+a (Command+a on Mac) was pressed, select all items
                        for (int i = 0; i < GetItemCount(); ++i) {
                                SetItemState(i, wxLIST_STATE_SELECTED, wxLIST_STATE_SELECTED);
                        }
                }

                evt.Skip();
                return;
        } else if (m_tts_time + 1500u < GetTickCount()) {
                m_tts_text.Clear();
        }

        m_tts_time = GetTickCount();
        m_tts_text.Append(wxTolower(key));

        // May happen if the subclass does not forward deletion events.
        // Or rather when single-char-repeated (see below) wraps around, so don't assert.
        if (m_tts_item >= GetItemCount()) {
                m_tts_item = -1;
        }

        unsigned next = (m_tts_item == -1) ? 0 : m_tts_item;
        for (unsigned i = 0, count = GetItemCount(); i < count; ++i) {
                wxString text = GetTTSText((next + i) % count).MakeLower();

                if (text.StartsWith(m_tts_text)) {
                        ClearSelection();

                        m_tts_item = (next + i) % count;
                        SetItemState(m_tts_item, wxLIST_STATE_FOCUSED | wxLIST_STATE_SELECTED,
                                        wxLIST_STATE_FOCUSED | wxLIST_STATE_SELECTED);
                        EnsureVisible(m_tts_item);

                        return;
                }
        }

        if (m_tts_item != -1) {
                // Crop the string so that it matches the old item (avoid typos).
                wxString text = GetTTSText(m_tts_item).MakeLower();

                // If the last key didn't result in a hit, then we skip the event.
                if (!text.StartsWith(m_tts_text)) {
                        if ((m_tts_text.Length() == 2) && (m_tts_text[0] == m_tts_text[1])) {
                                // Special case, single-char, repeated. This allows toggeling
                                // between items starting with a specific letter.
                                m_tts_text.Clear();
                                // Increment, so the next will be selected (or wrap around).
                                m_tts_item++;
                                OnChar(evt);
                        } else {
                                m_tts_text.RemoveLast();
                                evt.Skip(true);
                        }
                }
        } else {
                evt.Skip(true);
        }
}


void CMuleListCtrl::OnItemSelected(wxListEvent& evt)
{
        if (IsSorting()) {
                // Selection/Deselection that happened while sorting.
                evt.Veto();
        } else {
                        // We reset the current TTS session if the user manually changes the selection
                if (m_tts_item != evt.GetIndex()) {
                        ResetTTS();

                        // The item is changed so that the next TTS starts from the selected item.
                        m_tts_item = evt.GetIndex();
                }
                evt.Skip();
        }
}


void CMuleListCtrl::OnItemDeleted(wxListEvent& evt)
{
        if (evt.GetIndex() <= m_tts_item) {
                m_tts_item--;
        }

        evt.Skip();
}


void CMuleListCtrl::OnAllItemsDeleted(wxListEvent& evt)
{
        ResetTTS();

        evt.Skip();
}


void CMuleListCtrl::ResetTTS()
{
        m_tts_item = -1;
        m_tts_time =  0;
}

wxString CMuleListCtrl::GetOldColumnOrder() const
{
        return wxEmptyString;
}
// File_checked_for_headers