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() ) ;
}