choicece.cpp

很牛的GUI源码wxWidgets-2.8.0.zip 可在多种平台下运行.

    msStyle |= LBS_NOTIFY;

    return msStyle;
}

bool wxChoice::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
{
    if ( param != LBN_SELCHANGE)
    {
        // "selection changed" is the only event we're after
        return false;
    }

    int n = GetSelection();
    if (n > -1)
    {
        wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, m_windowId);
        event.SetInt(n);
        event.SetEventObject(this);
        event.SetString(GetStringSelection());
        if ( HasClientObjectData() )
            event.SetClientObject( GetClientObject(n) );
        else if ( HasClientUntypedData() )
            event.SetClientData( GetClientData(n) );
        ProcessCommand(event);
    }

    return true;
}

wxChoice::~wxChoice()
{
    Free();
}

// ----------------------------------------------------------------------------
// adding/deleting items to/from the list
// ----------------------------------------------------------------------------

int wxChoice::DoAppend(const wxString& item)
{
    int n = (int)::SendMessage(GetBuddyHwnd(), LB_ADDSTRING, 0, (LPARAM)item.c_str());

    if ( n == LB_ERR )
    {
        wxLogLastError(wxT("SendMessage(LB_ADDSTRING)"));
    }

    return n;
}

int wxChoice::DoInsert(const wxString& item, unsigned int pos)
{
    wxCHECK_MSG(!(GetWindowStyle() & wxCB_SORT), -1, wxT("can't insert into choice"));
    wxCHECK_MSG(IsValidInsert(pos), -1, wxT("invalid index"));

    int n = (int)::SendMessage(GetBuddyHwnd(), LB_INSERTSTRING, pos, (LPARAM)item.c_str());
    if ( n == LB_ERR )
    {
        wxLogLastError(wxT("SendMessage(LB_INSERTSTRING)"));
    }

    return n;
}

void wxChoice::Delete(unsigned int n)
{
    wxCHECK_RET( IsValid(n), wxT("invalid item index in wxChoice::Delete") );

    if ( HasClientObjectData() )
    {
        delete GetClientObject(n);
    }

    ::SendMessage(GetBuddyHwnd(), LB_DELETESTRING, n, 0);
}

void wxChoice::Clear()
{
    Free();

    ::SendMessage(GetBuddyHwnd(), LB_RESETCONTENT, 0, 0);
}

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

// ----------------------------------------------------------------------------
// selection
// ----------------------------------------------------------------------------

int wxChoice::GetSelection() const
{
    return (int)::SendMessage(GetBuddyHwnd(), LB_GETCURSEL, 0, 0);
}

void wxChoice::SetSelection(int n)
{
    ::SendMessage(GetBuddyHwnd(), LB_SETCURSEL, n, 0);
}

// ----------------------------------------------------------------------------
// string list functions
// ----------------------------------------------------------------------------

unsigned int wxChoice::GetCount() const
{
    return (unsigned int)::SendMessage(GetBuddyHwnd(), LB_GETCOUNT, 0, 0);
}

int wxChoice::FindString(const wxString& s, bool bCase) const
{
    // back to base class search for not native search type
    if (bCase)
       return wxItemContainerImmutable::FindString( s, bCase );

    int pos = (int)::SendMessage(GetBuddyHwnd(), LB_FINDSTRINGEXACT,
                               (WPARAM)-1, (LPARAM)s.c_str());

    return pos == LB_ERR ? wxNOT_FOUND : pos;
}

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
    void *data;
    if ( m_clientDataItemsType != wxClientData_None )
    {
        data = DoGetItemClientData(n);
    }
    else // no client data
    {
        data = NULL;
    }

    ::SendMessage(GetBuddyHwnd(), LB_DELETESTRING, n, 0);
    ::SendMessage(GetBuddyHwnd(), LB_INSERTSTRING, n, (LPARAM)s.c_str() );

    if ( data )
    {
        DoSetItemClientData(n, data);
    }
    //else: it's already NULL by default
}

wxString wxChoice::GetString(unsigned int n) const
{
    int len = (int)::SendMessage(GetBuddyHwnd(), LB_GETTEXTLEN, n, 0);

    wxString str;
    if ( len != LB_ERR && len > 0 )
    {
        if ( ::SendMessage
               (
                GetBuddyHwnd(),
                LB_GETTEXT,
                n,
                (LPARAM)(wxChar *)wxStringBuffer(str, len)
                ) == LB_ERR )
        {
            wxLogLastError(wxT("SendMessage(LB_GETLBTEXT)"));
        }
    }

    return str;
}

// ----------------------------------------------------------------------------
// client data
// ----------------------------------------------------------------------------

void wxChoice::DoSetItemClientData(unsigned int n, void* clientData)
{
    if ( ::SendMessage(GetHwnd(), LB_SETITEMDATA,
                       n, (LPARAM)clientData) == LB_ERR )
    {
        wxLogLastError(wxT("LB_SETITEMDATA"));
    }
}

void* wxChoice::DoGetItemClientData(unsigned int n) const
{
    LPARAM rc = ::SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
    if ( rc == LB_ERR )
    {
        wxLogLastError(wxT("LB_GETITEMDATA"));

        // unfortunately, there is no way to return an error code to the user
        rc = (LPARAM) NULL;
    }

    return (void *)rc;
}

void wxChoice::DoSetItemClientObject(unsigned int n, wxClientData* clientData)
{
    DoSetItemClientData(n, clientData);
}

wxClientData* wxChoice::DoGetItemClientObject(unsigned int n) const
{
    return (wxClientData *)DoGetItemClientData(n);
}

// ----------------------------------------------------------------------------
// size calculations
// ----------------------------------------------------------------------------

wxSize wxChoice::DoGetBestSize() const
{
    wxSize sizeBtn = GetBestSpinnerSize(IsVertical(GetWindowStyle()));
    sizeBtn.x += DEFAULT_ITEM_WIDTH + MARGIN_BETWEEN;

    int y;
    wxGetCharSize(GetHWND(), NULL, &y, GetFont());
    y = EDIT_HEIGHT_FROM_CHAR_HEIGHT(y);

    // JACS: we should always use the height calculated
    // from above, because otherwise we'll get a spin control
    // that's too big. So never use the height calculated
    // from wxSpinButton::DoGetBestSize().

    // if ( sizeBtn.y < y )
    {
        // make the text tall enough
        sizeBtn.y = y;
    }

    return sizeBtn;
}

void wxChoice::DoMoveWindow(int x, int y, int width, int height)
{
    int widthBtn = GetBestSpinnerSize(IsVertical(GetWindowStyle())).x;
    int widthText = width - widthBtn - MARGIN_BETWEEN;
    if ( widthText <= 0 )
    {
        wxLogDebug(_T("not enough space for wxSpinCtrl!"));
    }

    if ( !::MoveWindow(GetBuddyHwnd(), x, y, widthText, height, TRUE) )
    {
        wxLogLastError(wxT("MoveWindow(buddy)"));
    }

    x += widthText + MARGIN_BETWEEN;
    if ( !::MoveWindow(GetHwnd(), x, y, widthBtn, height, TRUE) )
    {
        wxLogLastError(wxT("MoveWindow"));
    }
}

// get total size of the control
void wxChoice::DoGetSize(int *x, int *y) const
{
    RECT spinrect, textrect, ctrlrect;
    GetWindowRect(GetHwnd(), &spinrect);
    GetWindowRect(GetBuddyHwnd(), &textrect);
    UnionRect(&ctrlrect, &textrect, &spinrect);

    if ( x )
        *x = ctrlrect.right - ctrlrect.left;
    if ( y )
        *y = ctrlrect.bottom - ctrlrect.top;
}

void wxChoice::DoGetPosition(int *x, int *y) const
{
    // hack: pretend that our HWND is the text control just for a moment
    WXHWND hWnd = GetHWND();
    wxConstCast(this, wxChoice)->m_hWnd = m_hwndBuddy;

    wxChoiceBase::DoGetPosition(x, y);

    wxConstCast(this, wxChoice)->m_hWnd = hWnd;
}

#endif // wxUSE_CHOICE && __SMARTPHONE__ && __WXWINCE__