/////////////////////////////////////////////////////////////////////////////
// Name:        lboxtest.cpp
// Purpose:     wxListBox sample
// Author:      Vadim Zeitlin
// Id:          $Id$
// Copyright:   (c) 2000 Vadim Zeitlin
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

/*
   Current bugs:

  +1. horz scrollbar doesn't appear in listbox
  +2. truncating text ctrl doesn't update display
  +3. deleting last listbox item doesn't update display
   4. text ctrl background corrupted after resize
 */

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

// for compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

// for all others, include the necessary headers
#ifndef WX_PRECOMP
    #include "wx/wx.h"
    #include "wx/app.h"
    #include "wx/frame.h"
    #include "wx/dcclient.h"

    #include "wx/button.h"
    #include "wx/checkbox.h"
    #include "wx/checklst.h"
    #include "wx/listbox.h"
    #include "wx/radiobox.h"
    #include "wx/radiobut.h"
    #include "wx/statbox.h"
    #include "wx/stattext.h"
    #include "wx/textctrl.h"
#endif

#include "wx/sizer.h"

#ifdef __WXUNIVERSAL__
    #include "wx/univ/theme.h"
#endif // __WXUNIVERSAL__

// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------

// control ids
enum
{
    LboxTest_Reset = 100,
    LboxTest_Create,
    LboxTest_Add,
    LboxTest_AddText,
    LboxTest_AddSeveral,
    LboxTest_AddMany,
    LboxTest_Clear,
#if wxUSE_LOG
    LboxTest_ClearLog,
#endif // wxUSE_LOG
    LboxTest_Change,
    LboxTest_ChangeText,
    LboxTest_Delete,
    LboxTest_DeleteText,
    LboxTest_DeleteSel,
    LboxTest_DeselectAll,
    LboxTest_Listbox,
    LboxTest_Quit
};

// ----------------------------------------------------------------------------
// our classes
// ----------------------------------------------------------------------------

// Define a new application type, each program should derive a class from wxApp
class LboxTestApp : public wxApp
{
public:
    // override base class virtuals
    // ----------------------------

    // this one is called on application startup and is a good place for the app
    // initialization (doing it here and not in the ctor allows to have an error
    // return: if OnInit() returns false, the application terminates)
    virtual bool OnInit();
};

// Define a new frame type: this is going to be our main frame
class LboxTestFrame : public wxFrame
{
public:
    // ctor(s) and dtor
    LboxTestFrame(const wxString& title);
    virtual ~LboxTestFrame();

protected:
    // event handlers
    void OnButtonReset(wxCommandEvent& event);
    void OnButtonCreate(wxCommandEvent& event);
    void OnButtonChange(wxCommandEvent& event);
    void OnButtonDelete(wxCommandEvent& event);
    void OnButtonDeleteSel(wxCommandEvent& event);
    void OnButtonDeselectAll(wxCommandEvent& event);
    void OnButtonClear(wxCommandEvent& event);

#if wxUSE_LOG
    void OnButtonClearLog(wxCommandEvent& event);
#endif // wxUSE_LOG
    void OnButtonAdd(wxCommandEvent& event);
    void OnButtonAddSeveral(wxCommandEvent& event);
    void OnButtonAddMany(wxCommandEvent& event);
    void OnButtonQuit(wxCommandEvent& event);

    void OnListbox(wxCommandEvent& event);
    void OnListboxDClick(wxCommandEvent& event);
    void OnListboxRDown(wxMouseEvent& event);

    void OnCheckOrRadioBox(wxCommandEvent& event);

    void OnUpdateUIAddSeveral(wxUpdateUIEvent& event);
    void OnUpdateUICreateButton(wxUpdateUIEvent& event);
    void OnUpdateUIClearButton(wxUpdateUIEvent& event);
    void OnUpdateUIDeleteButton(wxUpdateUIEvent& event);
    void OnUpdateUIDeleteSelButton(wxUpdateUIEvent& event);
    void OnUpdateUIDeselectAllButton(wxUpdateUIEvent& event);

    // reset the listbox parameters
    void Reset();

    // (re)create the listbox
    void CreateLbox();

    // listbox parameters
    // ------------------

    // the selection mode
    enum LboxSelection
    {
        LboxSel_Single,
        LboxSel_Extended,
        LboxSel_Multiple
    } m_lboxSelMode;

    // should it be sorted?
    bool m_sorted;

    // should it have horz scroll/vert scrollbar permanently shown?
    bool m_horzScroll,
         m_vertScrollAlways;

    // should the recreate button be enabled?
    bool m_dirty;

    // the controls
    // ------------

    // the sel mode radiobox
    wxRadioBox *m_radioSelMode;

    // the checkboxes
    wxCheckBox *m_chkSort,
               *m_chkHScroll,
               *m_chkVScroll;

    // the listbox itself and the sizer it is in
    wxListBox *m_lbox;
    wxSizer *m_sizerLbox;

    // panel the controls such as the listbox are in
    wxPanel* m_panel;

#if wxUSE_LOG
    // the listbox for logging messages
    wxListBox *m_lboxLog;
#endif // wxUSE_LOG

    // the text entries for "Add/change string" and "Delete" buttons
    wxTextCtrl *m_textAdd,
               *m_textChange,
               *m_textDelete;

private:
#if wxUSE_LOG
    // the log target we use to redirect messages to the listbox
    wxLog *m_logTarget;
#endif // wxUSE_LOG

    // any class wishing to process wxWidgets events must use this macro
    DECLARE_EVENT_TABLE()
};

#if wxUSE_LOG
// A log target which just redirects the messages to a listbox
class LboxLogger : public wxLog
{
public:
    LboxLogger(wxListBox *lbox, wxLog *logOld)
    {
        m_lbox = lbox;
        //m_lbox->Disable(); -- looks ugly under MSW
        m_logOld = logOld;
    }

    virtual ~LboxLogger()
    {
        wxLog::SetActiveTarget(m_logOld);
    }

private:
    // implement sink functions
    virtual void DoLog(wxLogLevel level, const wxChar *szString, time_t t)
    {
        // don't put trace messages into listbox or we can get into infinite
        // recursion
        if ( level == wxLOG_Trace )
        {
            if ( m_logOld )
            {
                // cast is needed to call protected method
                ((LboxLogger *)m_logOld)->DoLog(level, szString, t);
            }
        }
        else
        {
            wxLog::DoLog(level, szString, t);
        }
    }

    virtual void DoLogString(const wxChar *szString, time_t WXUNUSED(t))
    {
        wxString msg;
        TimeStamp(&msg);
        msg += szString;
        #ifdef __WXUNIVERSAL__
            m_lbox->AppendAndEnsureVisible(msg);
        #else // other ports don't have this method yet
            m_lbox->Append(msg);

            // SetFirstItem() isn't implemented in wxGTK
            #ifndef __WXGTK__
                m_lbox->SetFirstItem(m_lbox->GetCount() - 1);
            #endif
        #endif
    }

    // the control we use
    wxListBox *m_lbox;

    // the old log target
    wxLog *m_logOld;
};
#endif // wxUSE_LOG

// ----------------------------------------------------------------------------
// misc macros
// ----------------------------------------------------------------------------

IMPLEMENT_APP(LboxTestApp)

// ----------------------------------------------------------------------------
// event tables
// ----------------------------------------------------------------------------

BEGIN_EVENT_TABLE(LboxTestFrame, wxFrame)
    EVT_BUTTON(LboxTest_Reset, LboxTestFrame::OnButtonReset)
    EVT_BUTTON(LboxTest_Create, LboxTestFrame::OnButtonCreate)
    EVT_BUTTON(LboxTest_Change, LboxTestFrame::OnButtonChange)
    EVT_BUTTON(LboxTest_Delete, LboxTestFrame::OnButtonDelete)
    EVT_BUTTON(LboxTest_DeleteSel, LboxTestFrame::OnButtonDeleteSel)
    EVT_BUTTON(LboxTest_DeselectAll, LboxTestFrame::OnButtonDeselectAll)
    EVT_BUTTON(LboxTest_Clear, LboxTestFrame::OnButtonClear)
#if wxUSE_LOG
    EVT_BUTTON(LboxTest_ClearLog, LboxTestFrame::OnButtonClearLog)
#endif // wxUSE_LOG
    EVT_BUTTON(LboxTest_Add, LboxTestFrame::OnButtonAdd)
    EVT_BUTTON(LboxTest_AddSeveral, LboxTestFrame::OnButtonAddSeveral)
    EVT_BUTTON(LboxTest_AddMany, LboxTestFrame::OnButtonAddMany)
    EVT_BUTTON(LboxTest_Quit, LboxTestFrame::OnButtonQuit)

    EVT_TEXT_ENTER(LboxTest_AddText, LboxTestFrame::OnButtonAdd)
    EVT_TEXT_ENTER(LboxTest_DeleteText, LboxTestFrame::OnButtonDelete)

    EVT_UPDATE_UI_RANGE(LboxTest_Reset, LboxTest_Create,
                        LboxTestFrame::OnUpdateUICreateButton)

    EVT_UPDATE_UI(LboxTest_AddSeveral, LboxTestFrame::OnUpdateUIAddSeveral)
    EVT_UPDATE_UI(LboxTest_Clear, LboxTestFrame::OnUpdateUIClearButton)
    EVT_UPDATE_UI(LboxTest_DeleteText, LboxTestFrame::OnUpdateUIClearButton)
    EVT_UPDATE_UI(LboxTest_Delete, LboxTestFrame::OnUpdateUIDeleteButton)
    EVT_UPDATE_UI(LboxTest_Change, LboxTestFrame::OnUpdateUIDeleteSelButton)
    EVT_UPDATE_UI(LboxTest_ChangeText, LboxTestFrame::OnUpdateUIDeleteSelButton)
    EVT_UPDATE_UI(LboxTest_DeleteSel, LboxTestFrame::OnUpdateUIDeleteSelButton)
    EVT_UPDATE_UI(LboxTest_DeselectAll, LboxTestFrame::OnUpdateUIDeselectAllButton)

    EVT_LISTBOX(LboxTest_Listbox, LboxTestFrame::OnListbox)
    EVT_LISTBOX_DCLICK(wxID_ANY, LboxTestFrame::OnListboxDClick)
    EVT_CHECKBOX(wxID_ANY, LboxTestFrame::OnCheckOrRadioBox)
    EVT_RADIOBOX(wxID_ANY, LboxTestFrame::OnCheckOrRadioBox)
END_EVENT_TABLE()

// ============================================================================
// implementation
// ============================================================================

// ----------------------------------------------------------------------------
// app class
// ----------------------------------------------------------------------------

bool LboxTestApp::OnInit()
{
    wxFrame *frame = new LboxTestFrame(_T("wxListBox sample"));
    frame->Show();

#if wxUSE_LOG
    //wxLog::AddTraceMask(_T("listbox"));
    wxLog::AddTraceMask(_T("scrollbar"));
#endif // wxUSE_LOG

    return true;
}

// ----------------------------------------------------------------------------
// top level frame class
// ----------------------------------------------------------------------------

LboxTestFrame::LboxTestFrame(const wxString& title)
             : wxFrame(NULL, wxID_ANY, title, wxPoint(100, 100))
{
    // init everything
    m_dirty = false;
    m_radioSelMode = (wxRadioBox *)NULL;

    m_chkVScroll =
    m_chkHScroll =
    m_chkSort = (wxCheckBox *)NULL;

    m_lbox = (wxListBox *)NULL;
#if wxUSE_LOG
    m_lboxLog = (wxListBox *)NULL;
#endif // wxUSE_LOG
    m_sizerLbox = (wxSizer *)NULL;

#if wxUSE_LOG
    m_logTarget = (wxLog *)NULL;
#endif // wxUSE_LOG

    m_panel = new wxPanel(this, wxID_ANY);

    /*
       What we create here is a frame having 3 panes: the explanatory pane to
       the left allowing to set the listbox styles and recreate the control,
       the pane containing the listbox itself and the lower pane containing
       the buttons which allow to add/change/delete strings to/from it.
    */
    wxSizer *sizerTop = new wxBoxSizer(wxVERTICAL),
            *sizerUp = new wxBoxSizer(wxHORIZONTAL),
            *sizerLeft,
            *sizerRight = new wxBoxSizer(wxVERTICAL);

    // upper left pane
    static const wxString modes[] =
    {
        _T("single"),
        _T("extended"),
        _T("multiple"),
    };

    wxStaticBox *box = new wxStaticBox(m_panel, wxID_ANY, _T("&Set listbox parameters"));
    m_radioSelMode = new wxRadioBox(m_panel, wxID_ANY, _T("Selection &mode:"),
                                    wxDefaultPosition, wxDefaultSize,
                                    WXSIZEOF(modes), modes,
                                    1, wxRA_SPECIFY_COLS);

    m_chkVScroll = new wxCheckBox(m_panel, wxID_ANY, _T("Always show &vertical scrollbar"));
    m_chkHScroll = new wxCheckBox(m_panel, wxID_ANY, _T("Show &horizontal scrollbar"));
    m_chkSort = new wxCheckBox(m_panel, wxID_ANY, _T("&Sort items"));

    sizerLeft = new wxStaticBoxSizer(box, wxVERTICAL);

    sizerLeft->Add(m_chkVScroll, 0, wxLEFT | wxRIGHT, 5);
    sizerLeft->Add(m_chkHScroll, 0, wxLEFT | wxRIGHT, 5);
    sizerLeft->Add(m_chkSort, 0, wxLEFT | wxRIGHT, 5);
    sizerLeft->Add(5, 5, 0, wxGROW | wxALL, 5); // spacer
    sizerLeft->Add(m_radioSelMode, 0, wxGROW | wxALL, 5);

    wxSizer *sizerBtn = new wxBoxSizer(wxHORIZONTAL);
    wxButton *btn = new wxButton(m_panel, LboxTest_Reset, _T("&Reset"));
    sizerBtn->Add(btn, 0, wxLEFT | wxRIGHT, 5);
    btn = new wxButton(m_panel, LboxTest_Create, _T("&Create"));
    sizerBtn->Add(btn, 0, wxLEFT | wxRIGHT, 5);
    sizerLeft->Add(sizerBtn, 0, wxALIGN_CENTRE_HORIZONTAL | wxALL, 15);

    // middle pane
    wxStaticBox *box2 = new wxStaticBox(m_panel, wxID_ANY, _T("&Change listbox contents"));
    wxSizer *sizerMiddle = new wxStaticBoxSizer(box2, wxVERTICAL);

    wxSizer *sizerRow = new wxBoxSizer(wxHORIZONTAL);
    btn = new wxButton(m_panel, LboxTest_Add, _T("&Add this string"));
    m_textAdd = new wxTextCtrl(m_panel, LboxTest_AddText, _T("test item 0"));
    sizerRow->Add(btn, 0, wxRIGHT, 5);
    sizerRow->Add(m_textAdd, 1, wxLEFT, 5);
    sizerMiddle->Add(sizerRow, 0, wxALL | wxGROW, 5);

    btn = new wxButton(m_panel, LboxTest_AddSeveral, _T("&Insert a few strings"));
    sizerMiddle->Add(btn, 0, wxALL | wxGROW, 5);

    btn = new wxButton(m_panel, LboxTest_AddMany, _T("Add &many strings"));
    sizerMiddle->Add(btn, 0, wxALL | wxGROW, 5);

    sizerRow = new wxBoxSizer(wxHORIZONTAL);
    btn = new wxButton(m_panel, LboxTest_Change, _T("C&hange current"));
    m_textChange = new wxTextCtrl(m_panel, LboxTest_ChangeText, wxEmptyString);
    sizerRow->Add(btn, 0, wxRIGHT, 5);
    sizerRow->Add(m_textChange, 1, wxLEFT, 5);
    sizerMiddle->Add(sizerRow, 0, wxALL | wxGROW, 5);

    sizerRow = new wxBoxSizer(wxHORIZONTAL);
    btn = new wxButton(m_panel, LboxTest_Delete, _T("&Delete this item"));
    m_textDelete = new wxTextCtrl(m_panel, LboxTest_DeleteText, wxEmptyString);
    sizerRow->Add(btn, 0, wxRIGHT, 5);
    sizerRow->Add(m_textDelete, 1, wxLEFT, 5);
    sizerMiddle->Add(sizerRow, 0, wxALL | wxGROW, 5);

    btn = new wxButton(m_panel, LboxTest_DeleteSel, _T("Delete &selection"));
    sizerMiddle->Add(btn, 0, wxALL | wxGROW, 5);

    btn = new wxButton(m_panel, LboxTest_DeselectAll, _T("Deselect All"));
    sizerMiddle->Add(btn, 0, wxALL | wxGROW, 5);

    btn = new wxButton(m_panel, LboxTest_Clear, _T("&Clear"));
    sizerMiddle->Add(btn, 0, wxALL | wxGROW, 5);

    // right pane
    sizerRight->SetMinSize(250, 0);
    m_sizerLbox = sizerRight; // save it to modify it later

    // the 3 panes panes compose the upper part of the window
    sizerUp->Add(sizerLeft, 0, wxGROW | (wxALL & ~wxLEFT), 10);
    sizerUp->Add(sizerMiddle, 1, wxGROW | wxALL, 10);
    sizerUp->Add(sizerRight, 1, wxGROW | (wxALL & ~wxRIGHT), 10);

    // the lower one only has the log listbox and a button to clear it
#if wxUSE_LOG
    wxSizer *sizerDown = new wxStaticBoxSizer
                             (
                               new wxStaticBox(m_panel, wxID_ANY, _T("&Log window")),
                               wxVERTICAL
                             );
    m_lboxLog = new wxListBox(m_panel, wxID_ANY);
    sizerDown->Add(m_lboxLog, 1, wxGROW | wxALL, 5);
#else
    wxSizer *sizerDown = new wxBoxSizer(wxVERTICAL);
#endif // wxUSE_LOG
    wxBoxSizer *sizerBtns = new wxBoxSizer(wxHORIZONTAL);
#if wxUSE_LOG
    btn = new wxButton(m_panel, LboxTest_ClearLog, _T("Clear &log"));
    sizerBtns->Add(btn);
    sizerBtns->Add(10, 0); // spacer
#endif // wxUSE_LOG
    btn = new wxButton(m_panel, LboxTest_Quit, _T("E&xit"));
    sizerBtns->Add(btn);
    sizerDown->Add(sizerBtns, 0, wxALL | wxALIGN_RIGHT, 5);

    // put everything together
    sizerTop->Add(sizerUp, 1, wxGROW | (wxALL & ~wxBOTTOM), 10);
    sizerTop->Add(0, 5, 0, wxGROW); // spacer in between
    sizerTop->Add(sizerDown, 0,  wxGROW | (wxALL & ~wxTOP), 10);

    // final initialization and create the listbox
    Reset();
    CreateLbox();

    m_panel->SetSizer(sizerTop);

    sizerTop->Fit(this);
    sizerTop->SetSizeHints(this);

#if wxUSE_LOG
    // now that everything is created we can redirect the log messages to the
    // listbox
    m_logTarget = new LboxLogger(m_lboxLog, wxLog::GetActiveTarget());
    wxLog::SetActiveTarget(m_logTarget);
#endif // wxUSE_LOG
}

LboxTestFrame::~LboxTestFrame()
{
#if wxUSE_LOG
    delete m_logTarget;
#endif // wxUSE_LOG
}

// ----------------------------------------------------------------------------
// operations
// ----------------------------------------------------------------------------

void LboxTestFrame::Reset()
{
    if ( m_radioSelMode->GetSelection() == LboxSel_Single &&
         !m_chkSort->GetValue() &&
         m_chkHScroll->GetValue() &&
         !m_chkVScroll->GetValue() )
    {
        // nothing to do
        return;
    }

    m_radioSelMode->SetSelection(LboxSel_Single);
    m_chkSort->SetValue(false);
    m_chkHScroll->SetValue(true);
    m_chkVScroll->SetValue(false);

    m_dirty = true;
}

void LboxTestFrame::CreateLbox()
{
    int flags = 0;
    switch ( m_radioSelMode->GetSelection() )
    {
        default:
            wxFAIL_MSG( _T("unexpected radio box selection") );

        case LboxSel_Single:    flags |= wxLB_SINGLE; break;
        case LboxSel_Extended:  flags |= wxLB_EXTENDED; break;
        case LboxSel_Multiple:  flags |= wxLB_MULTIPLE; break;
    }

    if ( m_chkVScroll->GetValue() )
        flags |= wxLB_ALWAYS_SB;
    if ( m_chkHScroll->GetValue() )
        flags |= wxLB_HSCROLL;
    if ( m_chkSort->GetValue() )
        flags |= wxLB_SORT;

    wxArrayString items;
    
    if ( m_lbox ) // cache old items to restore later if listbox existed
    {
    int count = m_lbox->GetCount();
    for ( int n = 0; n < count; n++ )
    {
        items.Add(m_lbox->GetString(n));
    }

    m_sizerLbox->Detach(m_lbox);
    delete m_lbox;
    }

    m_lbox = new wxListBox(m_panel, LboxTest_Listbox,
                           wxDefaultPosition, wxDefaultSize,
                           0, NULL,
                           flags);

    m_lbox->Set(items);
    m_sizerLbox->Add(m_lbox, 1, wxGROW | wxALL, 5);
    m_sizerLbox->Layout();

    m_dirty = false;

    m_lbox->Connect(wxEVT_RIGHT_DOWN, 
        wxMouseEventHandler(LboxTestFrame::OnListboxRDown), NULL, this);
}

// ----------------------------------------------------------------------------
// event handlers
// ----------------------------------------------------------------------------

void LboxTestFrame::OnButtonQuit(wxCommandEvent& WXUNUSED(event))
{
    Close();
}

void LboxTestFrame::OnButtonReset(wxCommandEvent& WXUNUSED(event))
{
    Reset();
}

void LboxTestFrame::OnButtonCreate(wxCommandEvent& WXUNUSED(event))
{
    CreateLbox();
}

void LboxTestFrame::OnButtonChange(wxCommandEvent& WXUNUSED(event))
{
    wxArrayInt selections;
    int count = m_lbox->GetSelections(selections);
    wxString s = m_textChange->GetValue();
    for ( int n = 0; n < count; n++ )
    {
        m_lbox->SetString(selections[n], s);
    }
}

void LboxTestFrame::OnButtonDelete(wxCommandEvent& WXUNUSED(event))
{
    unsigned long n;
    if ( !m_textDelete->GetValue().ToULong(&n) ||
            (n >= (unsigned)m_lbox->GetCount()) )
    {
        return;
    }

    m_lbox->Delete(n);
}

void LboxTestFrame::OnButtonDeleteSel(wxCommandEvent& WXUNUSED(event))
{
    wxArrayInt selections;
    int n = m_lbox->GetSelections(selections);
    while ( n > 0 )
    {
        m_lbox->Delete(selections[--n]);
    }
}

void LboxTestFrame::OnButtonDeselectAll(wxCommandEvent& WXUNUSED(event))
{
    m_lbox->SetSelection(-1); 
}

void LboxTestFrame::OnButtonClear(wxCommandEvent& WXUNUSED(event))
{
    m_lbox->Clear();
}

#if wxUSE_LOG
void LboxTestFrame::OnButtonClearLog(wxCommandEvent& WXUNUSED(event))
{
    m_lboxLog->Clear();
}
#endif // wxUSE_LOG

void LboxTestFrame::OnButtonAdd(wxCommandEvent& WXUNUSED(event))
{
    static size_t s_item = 0;

    wxString s = m_textAdd->GetValue();
    if ( !m_textAdd->IsModified() )
    {
        // update the default string
        m_textAdd->SetValue(wxString::Format(_T("test item %u"), ++s_item));
    }

    m_lbox->Append(s);
}

void LboxTestFrame::OnButtonAddMany(wxCommandEvent& WXUNUSED(event))
{
    // "many" means 1000 here
    for ( size_t n = 0; n < 1000; n++ )
    {
        m_lbox->Append(wxString::Format(_T("item #%u"), n));
    }
}

void LboxTestFrame::OnButtonAddSeveral(wxCommandEvent& WXUNUSED(event))
{
    wxArrayString items;
    items.Add(_T("First"));
    items.Add(_T("another one"));
    items.Add(_T("and the last (very very very very very very very very very very long) one"));
    m_lbox->InsertItems(items, 0);
}

void LboxTestFrame::OnUpdateUICreateButton(wxUpdateUIEvent& event)
{
    event.Enable(m_dirty);
}

void LboxTestFrame::OnUpdateUIDeleteButton(wxUpdateUIEvent& event)
{
    unsigned long n;
    event.Enable(m_textDelete->GetValue().ToULong(&n) &&
                    (n < (unsigned)m_lbox->GetCount()));
}

void LboxTestFrame::OnUpdateUIDeleteSelButton(wxUpdateUIEvent& event)
{
    wxArrayInt selections;
    event.Enable(m_lbox->GetSelections(selections) != 0);
}

void LboxTestFrame::OnUpdateUIDeselectAllButton(wxUpdateUIEvent& event)
{
    wxArrayInt selections;
    event.Enable(m_lbox->GetSelections(selections) != 0);
}

void LboxTestFrame::OnUpdateUIClearButton(wxUpdateUIEvent& event)
{
    event.Enable(m_lbox->GetCount() != 0);
}

void LboxTestFrame::OnUpdateUIAddSeveral(wxUpdateUIEvent& event)
{
    event.Enable(!(m_lbox->GetWindowStyle() & wxLB_SORT));
}

void LboxTestFrame::OnListbox(wxCommandEvent& event)
{
    int sel = event.GetInt();
    m_textDelete->SetValue(wxString::Format(_T("%d"), sel));

    wxLogMessage(_T("Listbox item %d selected"), sel);
}

void LboxTestFrame::OnListboxDClick(wxCommandEvent& event)
{
    int sel = event.GetInt();
    wxLogMessage(_T("Listbox item %d double clicked"), sel);
}

void LboxTestFrame::OnListboxRDown(wxMouseEvent& event)
{
    int item = m_lbox->HitTest(event.GetPosition());

    if ( item != wxNOT_FOUND )
        wxLogMessage(_T("Listbox item %d right clicked"), item);
    else
        wxLogMessage(_T("Listbox right clicked but no item clicked upon"));

    event.Skip();
}

void LboxTestFrame::OnCheckOrRadioBox(wxCommandEvent& WXUNUSED(event))
{
    m_dirty = true;
}