自学教程：C++ GetClientObject函数代码示例

void wxChoice::SetString(unsigned int n, const wxString& s){    wxCHECK_RET( IsValid(n), wxT("invalid item index in wxChoice::SetString") );    // we have to delete and add back the string as there is no way to change a    // string in place    // we need to preserve the client data manually    void *oldData = NULL;    wxClientData *oldObjData = NULL;    if ( HasClientUntypedData() )        oldData = GetClientData(n);    else if ( HasClientObjectData() )        oldObjData = GetClientObject(n);    // and also the selection if we're going to delete the item that was    // selected    const bool wasSelected = static_cast<int>(n) == GetSelection();    ::SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);    ::SendMessage(GetHwnd(), CB_INSERTSTRING, n, (LPARAM)s.wx_str() );    // restore the client data    if ( oldData )        SetClientData(n, oldData);    else if ( oldObjData )        SetClientObject(n, oldObjData);    // and the selection    if ( wasSelected )        SetSelection(n);    // the width could have changed so the best size needs to be recomputed    InvalidateBestSize();}

bool wxChoice::OS2Command(  WXUINT                            uParam, WXWORD                            WXUNUSED(wId)){    if (uParam != LN_SELECT)    {        //        // "selection changed" is the only event we're after        //        return false;    }    int                             n = GetSelection();    if (n > -1)    {        wxCommandEvent              vEvent( wxEVT_CHOICE                                           ,m_windowId                                          );        vEvent.SetInt(n);        vEvent.SetEventObject(this);        vEvent.SetString(GetStringSelection());        if (HasClientObjectData())            vEvent.SetClientObject(GetClientObject(n));        else if (HasClientUntypedData())            vEvent.SetClientData(GetClientData(n));        ProcessCommand(vEvent);    }    return true;} // end of wxChoice::OS2Command

bool wxListBox::SendEvent(wxEventType type, int item){    wxCommandEvent event(type, m_windowId);    event.SetEventObject(this);    // use the current item by default    if ( item == -1 )    {        item = m_current;    }    // client data and string parameters only make sense if we have an item    if ( item != -1 )    {        if ( HasClientObjectData() )            event.SetClientObject(GetClientObject(item));        else if ( HasClientUntypedData() )            event.SetClientData(GetClientData(item));        event.SetString(GetString(item));    }    event.SetInt(item);    return GetEventHandler()->ProcessEvent(event);}

void wxChoice::SetString(unsigned int n, const wxString& s){    wxCHECK_RET( IsValid(n), wxT("invalid item index in wxChoice::SetString") );    // we have to delete and add back the string as there is no way to change a    // string in place    // we need to preserve the client data manually    void *oldData = NULL;    wxClientData *oldObjData = NULL;    if ( HasClientUntypedData() )        oldData = GetClientData(n);    else if ( HasClientObjectData() )        oldObjData = GetClientObject(n);    ::SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);    ::SendMessage(GetHwnd(), CB_INSERTSTRING, n, (LPARAM)s.wx_str() );    // restore the client data    if ( oldData )        SetClientData(n, oldData);    else if ( oldObjData )        SetClientObject(n, oldObjData);    InvalidateBestSize();}

void wxListBox::SetString(unsigned int n, const wxString& rsString){    wxCHECK_RET( IsValid(n),                 wxT("invalid index in wxListBox::SetString") );    //    // Remember the state of the item    //    bool           bWasSelected = IsSelected(n);    void*          pOldData = NULL;    wxClientData*  pOldObjData = NULL;    if ( HasClientUntypedData() )        pOldData = GetClientData(n);    else if ( HasClientObjectData() )        pOldObjData = GetClientObject(n);    //    // Delete and recreate it    //    ::WinSendMsg( GetHwnd()                 ,LM_DELETEITEM                 ,(MPARAM)n                 ,(MPARAM)0                );    int nNewN = n;    if (n == (m_nNumItems - 1))        nNewN = -1;    ::WinSendMsg( GetHwnd()                 ,LM_INSERTITEM                 ,(MPARAM)nNewN                 ,(MPARAM)rsString.wx_str()                );    //    // Restore the client data    //    if (pOldData)        SetClientData(n, pOldData);    else if (pOldObjData)        SetClientObject(n, pOldObjData);    //    // We may have lost the selection    //    if (bWasSelected)        Select(n);#if wxUSE_OWNER_DRAWN    if (m_windowStyle & wxLB_OWNERDRAW)        //        // Update item's text        //        m_aItems[n]->SetName(rsString);#endif  //USE_OWNER_DRAWN} // end of wxListBox::SetString

wxString ctlComboBoxFix::GetStringKey(int sel){    if (sel < 0)        sel = GetSelection();    StringClientData *scd=(StringClientData*)GetClientObject(sel);    if (scd)        return scd->str;    return wxEmptyString;}

void wxItemContainer::ResetItemClientObject(unsigned int n){    wxClientData * const data = GetClientObject(n);    if ( data )    {        delete data;        DoSetItemClientData(n, NULL);    }}

void MainFrame::OnImageButtonClick(wxCommandEvent &event) {  wxProgressDialog progress("Loading", "Now Loading", 4, this);  auto button = dynamic_cast<wxButton *>(event.GetEventObject());  auto clientData =      dynamic_cast<wxStringClientData *>(button->GetClientObject());  auto page = notebook->GetPageCount();  progress.Update(1);  auto childEntry =      dynamic_cast<EntryItemData *>(button->GetClientObject())->Get();  progress.Update(2);  auto bitmapCtl = new ImageViewPanel(notebook, childEntry);  progress.Update(3);  notebook->AddPage(bitmapCtl, childEntry->Name());  progress.Update(4);  bitmapCtl->SwitchToTheActualImage();  notebook->SetSelection(page);}

void wxRearrangeList::Swap(int pos1, int pos2){    // update the internally stored order    wxSwap(m_order[pos1], m_order[pos2]);    // and now also swap all the attributes of the items    // first the label    const wxString stringTmp = GetString(pos1);    SetString(pos1, GetString(pos2));    Check(pos1, IsChecked(pos2));    // then the checked state    const bool checkedTmp = IsChecked(pos1);    SetString(pos2, stringTmp);    Check(pos2, checkedTmp);    // and finally the client data, if necessary    switch ( GetClientDataType() )    {        case wxClientData_None:            // nothing to do            break;        case wxClientData_Object:            {                wxClientData * const dataTmp = GetClientObject(pos1);                SetClientObject(pos1, GetClientObject(pos2));                SetClientObject(pos2, dataTmp);            }            break;        case wxClientData_Void:            {                void * const dataTmp = GetClientData(pos1);                SetClientData(pos1, GetClientData(pos2));                SetClientData(pos2, dataTmp);            }            break;    }}

void wxChoice::FreeData(){    if ( HasClientObjectData() )    {        size_t count = GetCount();        for ( size_t n = 0; n < count; n++ )        {            delete GetClientObject(n);        }    }}

wxChoice::~wxChoice(){    if ( HasClientObjectData() )    {        unsigned int i, max = GetCount();        for ( i = 0; i < max; ++i )            delete GetClientObject( i );    }    delete m_popUpMenu;}

void wxChoice::Free(){    if ( HasClientObjectData() )    {        unsigned int count = GetCount();        for ( unsigned int n = 0; n < count; n++ )        {            delete GetClientObject(n);        }    }}

void wxChoice::Delete(int n){    wxCHECK_RET( n < GetCount(), wxT("invalid item index in wxChoice::Delete") );    if ( HasClientObjectData() )    {        delete GetClientObject(n);    }    ::SendMessage(GetBuddyHwnd(), LB_DELETESTRING, n, 0);}

void wxChoice::Delete(int n){    wxCHECK_RET( n < GetCount(), wxT("invalid item index in wxChoice::Delete") );    if ( HasClientObjectData() )    {        delete GetClientObject(n);    }    ::DeleteMenuItem( MAC_WXHMENU(m_macPopUpMenuHandle) , n + 1) ;    m_strings.RemoveAt( n ) ;    m_datas.RemoveAt( n ) ;    m_peer->SetMaximum( GetCount() ) ;}

void wxChoice::Delete(unsigned int n){    wxCHECK_RET( IsValid(n) , wxT("wxChoice::Delete: invalid index") );    if ( HasClientObjectData() )        delete GetClientObject( n );    ::DeleteMenuItem( MAC_WXHMENU(m_macPopUpMenuHandle) , n + 1 ) ;    m_strings.RemoveAt( n ) ;    m_datas.RemoveAt( n ) ;    m_peer->SetMaximum( GetCount() ) ;}

voidwxControlWithItemsBase::InitCommandEventWithItems(wxCommandEvent& event, int n){    InitCommandEvent(event);    if ( n != wxNOT_FOUND )    {        if ( HasClientObjectData() )            event.SetClientObject(GetClientObject(n));        else if ( HasClientUntypedData() )            event.SetClientData(GetClientData(n));    }}

void wxChoice::DoDeleteOneItem(unsigned int n){    wxCHECK_RET( IsValid(n) , wxT("wxChoice::Delete: invalid index") );    if ( HasClientObjectData() )        delete GetClientObject( n );    m_popUpMenu->Delete( m_popUpMenu->FindItemByPosition( n ) );    m_strings.RemoveAt( n ) ;    m_datas.RemoveAt( n ) ;    DoAfterItemCountChange();}

bool wxListBoxBase::SendEvent(wxEventType evtType, int item, bool selected){    wxCommandEvent event(evtType, GetId());    event.SetEventObject(this);    event.SetInt(item);    event.SetString(GetString(item));    event.SetExtraLong(selected);    if ( HasClientObjectData() )        event.SetClientObject(GetClientObject(item));    else if ( HasClientUntypedData() )        event.SetClientData(GetClientData(item));    return HandleWindowEvent(event);}

void wxChoice::Delete(unsigned int n){    wxCHECK_RET( IsValid(n), wxT("invalid item index in wxChoice::Delete") );    if ( HasClientObjectData() )    {        delete GetClientObject(n);    }    SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);    if ( !IsFrozen() )        UpdateVisibleHeight();    InvalidateBestSize();}

void wxListBox::SetString(int N, const wxString& s){    wxCHECK_RET( N >= 0 && N < m_noItems,                 wxT("invalid index in wxListBox::SetString") );    // remember the state of the item    bool wasSelected = IsSelected(N);    void *oldData = NULL;    wxClientData *oldObjData = NULL;    if ( m_clientDataItemsType == wxClientData_Void )        oldData = GetClientData(N);    else if ( m_clientDataItemsType == wxClientData_Object )        oldObjData = GetClientObject(N);    // delete and recreate it    SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);    int newN = N;    if ( N == m_noItems - 1 )        newN = -1;    ListBox_InsertString(GetHwnd(), newN, s);    // restore the client data    if ( oldData )        SetClientData(N, oldData);    else if ( oldObjData )        SetClientObject(N, oldObjData);#if wxUSE_OWNER_DRAWN    if ( m_windowStyle & wxLB_OWNERDRAW )    {        // update item's text        m_aItems[N]->SetName(s);        // reassign the item's data        ListBox_SetItemData(GetHwnd(), N, m_aItems[N]);    }#endif  //USE_OWNER_DRAWN    // we may have lost the selection    if ( wasSelected )        Select(N);    InvalidateBestSize();}

bool wxListBox::OS2Command(  WXUINT                            uParam, WXWORD                            WXUNUSED(wId)){    wxEventType                     eEvtType;    if (uParam == LN_SELECT)    {        eEvtType = wxEVT_COMMAND_LISTBOX_SELECTED;    }    else if (uParam == LN_ENTER)    {        eEvtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;    }    else    {        //        // Some event we're not interested in        //        return false;    }    wxCommandEvent                  vEvent( eEvtType                                           ,m_windowId                                          );    vEvent.SetEventObject(this);    wxArrayInt                      aSelections;    int                             n;    int                             nCount = GetSelections(aSelections);    if (nCount > 0)    {        n = aSelections[0];        if (HasClientObjectData())            vEvent.SetClientObject(GetClientObject(n));        else if ( HasClientUntypedData() )            vEvent.SetClientData(GetClientData(n));        vEvent.SetString(GetString(n));    }    else    {        n = -1;    }    vEvent.SetInt(n);    return GetEventHandler()->ProcessEvent(vEvent);} // end of wxListBox::OS2Command

void wxListBox::SetString(unsigned int n, const wxString& s){    wxCHECK_RET( IsValid(n),                 wxT("invalid index in wxListBox::SetString") );    // remember the state of the item    bool wasSelected = IsSelected(n);    void *oldData = NULL;    wxClientData *oldObjData = NULL;    if ( m_clientDataItemsType == wxClientData_Void )        oldData = GetClientData(n);    else if ( m_clientDataItemsType == wxClientData_Object )        oldObjData = GetClientObject(n);    // delete and recreate it    SendMessage(GetHwnd(), LB_DELETESTRING, n, 0);    int newN = n;    if ( n == (m_noItems - 1) )        newN = -1;    ListBox_InsertString(GetHwnd(), newN, s);    // restore the client data    if ( oldData )        SetClientData(n, oldData);    else if ( oldObjData )        SetClientObject(n, oldObjData);#if wxUSE_OWNER_DRAWN    if ( m_windowStyle & wxLB_OWNERDRAW )    {        // update item's text        m_aItems[n]->SetName(s);        // reassign the item's data        ListBox_SetItemData(GetHwnd(), n, m_aItems[n]);    }#endif  //USE_OWNER_DRAWN    // we may have lost the selection    if ( wasSelected )        Select(n);    SetHorizontalExtent();}

void wxListBox::Free(){#if wxUSE_OWNER_DRAWN    if ( m_windowStyle & wxLB_OWNERDRAW )    {        WX_CLEAR_ARRAY(m_aItems);    }    else#endif // wxUSE_OWNER_DRAWN    if ( HasClientObjectData() )    {        for ( unsigned int n = 0; n < m_noItems; n++ )        {            delete GetClientObject(n);        }    }}

void wxListBox::MacDoClick(){    wxArrayInt aSelections;    int n ;    size_t count = GetSelections(aSelections);    if ( count == m_selectionPreImage.GetCount() )    {        bool hasChanged = false ;        for ( size_t i = 0 ; i < count ; ++i )        {            if ( aSelections[i] != m_selectionPreImage[i] )            {                hasChanged = true ;                break ;            }        }        if ( !hasChanged )        {            return ;        }    }    m_selectionPreImage = aSelections;    wxCommandEvent event(wxEVT_COMMAND_LISTBOX_SELECTED, m_windowId);    event.SetEventObject( this );    if ( count > 0 )    {        n = aSelections[0];        if ( HasClientObjectData() )            event.SetClientObject( GetClientObject(n) );        else if ( HasClientUntypedData() )            event.SetClientData( GetClientData(n) );        event.SetString(GetString(n));    }    else    {        n = -1;    }    event.SetInt(n);    GetEventHandler()->ProcessEvent(event);}

bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id)){    if ((param == LBN_SELCHANGE) && HasMultipleSelection())    {        CalcAndSendEvent();        return true;    }    wxEventType evtType;    int n;    if ( param == LBN_SELCHANGE )    {        evtType = wxEVT_COMMAND_LISTBOX_SELECTED;        n = SendMessage(GetHwnd(), LB_GETCARETINDEX, 0, 0);        // NB: conveniently enough, LB_ERR is the same as wxNOT_FOUND    }    else if ( param == LBN_DBLCLK )    {        evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;        n = HitTest(ScreenToClient(wxGetMousePosition()));    }    else    {        // some event we're not interested in        return false;    }    // retrieve the affected item    if ( n == wxNOT_FOUND )        return false;    wxCommandEvent event(evtType, m_windowId);    event.SetEventObject(this);    if ( HasClientObjectData() )        event.SetClientObject( GetClientObject(n) );    else if ( HasClientUntypedData() )        event.SetClientData( GetClientData(n) );    event.SetString(GetString(n));    event.SetInt(n);    return HandleWindowEvent(event);}

    virtual bool GetAttr(const wxDataViewItem &item,                         unsigned int col,                         wxDataViewItemAttr & attr) const {        if ( col == 1 ) {            clFunctionImplDetails *cd = dynamic_cast<clFunctionImplDetails*>( GetClientObject(item));            if ( !cd->IsSelected() ) {                attr.SetColour( wxSystemSettings::GetColour(wxSYS_COLOUR_GRAYTEXT ) );                attr.SetBold(false);            } else {                attr.SetBold(true);            }            return true;        } else {            return false;        }    }

wxInt32 wxChoice::MacControlHit(WXEVENTHANDLERREF WXUNUSED(handler) , WXEVENTREF WXUNUSED(event) ){    wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, m_windowId );    int n = GetSelection();    // actually n should be made sure by the os to be a valid selection, but ...    if ( n > -1 )    {        event.SetInt( n );        event.SetString(GetStringSelection());        event.SetEventObject(this);        if ( HasClientObjectData() )            event.SetClientObject( GetClientObject(n) );        else if ( HasClientUntypedData() )            event.SetClientData( GetClientData(n) );        ProcessCommand(event);    }    return noErr ;}