vlbox.cpp

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                                 wxRect& WXUNUSED(rect),
                                 size_t WXUNUSED(n)) const
{
}

void wxVListBox::OnDrawBackground(wxDC& dc, const wxRect& rect, size_t n) const
{
    // we need to render selected and current items differently
    const bool isSelected = IsSelected(n),
               isCurrent = IsCurrent(n);
    if ( isSelected || isCurrent )
    {
        if ( isSelected )
        {
            dc.SetBrush(wxBrush(m_colBgSel, wxSOLID));
        }
        else // !selected
        {
            dc.SetBrush(*wxTRANSPARENT_BRUSH);
        }

        dc.SetPen(*(isCurrent ? wxBLACK_PEN : wxTRANSPARENT_PEN));

        dc.DrawRectangle(rect);
    }
    //else: do nothing for the normal items
}

void wxVListBox::OnPaint(wxPaintEvent& WXUNUSED(event))
{
    // If size is larger, recalculate double buffer bitmap
    wxSize clientSize = GetClientSize();

    if ( !gs_doubleBuffer ||
         clientSize.x > gs_doubleBuffer->GetWidth() ||
         clientSize.y > gs_doubleBuffer->GetHeight() )
    {
        delete gs_doubleBuffer;
        gs_doubleBuffer = new wxBitmap(clientSize.x+25,clientSize.y+25);
    }

    wxBufferedPaintDC dc(this,*gs_doubleBuffer);

    // the update rectangle
    wxRect rectUpdate = GetUpdateClientRect();

    // Fill it with background colour
    dc.SetBrush(GetBackgroundColour());
    dc.Clear();

    // the bounding rectangle of the current line
    wxRect rectLine;
    rectLine.width = clientSize.x;

    // iterate over all visible lines
    const size_t lineMax = GetLastVisibleLine();
    for ( size_t line = GetFirstVisibleLine(); line <= lineMax; line++ )
    {
        const wxCoord hLine = OnGetLineHeight(line);

        rectLine.height = hLine;

        // and draw the ones which intersect the update rect
        if ( rectLine.Intersects(rectUpdate) )
        {
            // don't allow drawing outside of the lines rectangle
            wxDCClipper clip(dc, rectLine);

            wxRect rect = rectLine;
            OnDrawBackground(dc, rect, line);

            OnDrawSeparator(dc, rect, line);

            rect.Deflate(m_ptMargins.x, m_ptMargins.y);
            OnDrawItem(dc, rect, line);
        }
        else // no intersection
        {
            if ( rectLine.GetTop() > rectUpdate.GetBottom() )
            {
                // we are already below the update rect, no need to continue
                // further
                break;
            }
            //else: the next line may intersect the update rect
        }

        rectLine.y += hLine;
    }
}

// ============================================================================
// wxVListBox keyboard/mouse handling
// ============================================================================

void wxVListBox::DoHandleItemClick(int item, int flags)
{
    // has anything worth telling the client code about happened?
    bool notify = false;

    if ( HasMultipleSelection() )
    {
        // select the iteem clicked?
        bool select = true;

        // NB: the keyboard interface we implement here corresponds to
        //     wxLB_EXTENDED rather than wxLB_MULTIPLE but this one makes more
        //     sense IMHO
        if ( flags & ItemClick_Shift )
        {
            if ( m_current != wxNOT_FOUND )
            {
                if ( m_anchor == wxNOT_FOUND )
                    m_anchor = m_current;

                select = false;

                // only the range from the selection anchor to new m_current
                // must be selected
                if ( DeselectAll() )
                    notify = true;

                if ( SelectRange(m_anchor, item) )
                    notify = true;
            }
            //else: treat it as ordinary click/keypress
        }
        else // Shift not pressed
        {
            m_anchor = item;

            if ( flags & ItemClick_Ctrl )
            {
                select = false;

                if ( !(flags & ItemClick_Kbd) )
                {
                    Toggle(item);

                    // the status of the item has definitely changed
                    notify = true;
                }
                //else: Ctrl-arrow pressed, don't change selection
            }
            //else: behave as in single selection case
        }

        if ( select )
        {
            // make the clicked item the only selection
            if ( DeselectAll() )
                notify = true;

            if ( Select(item) )
                notify = true;
        }
    }

    // in any case the item should become the current one
    if ( DoSetCurrent(item) )
    {
        if ( !HasMultipleSelection() )
        {
            // this has also changed the selection for single selection case
            notify = true;
        }
    }

    if ( notify )
    {
        // notify the user about the selection change
        SendSelectedEvent();
    }
    //else: nothing changed at all
}

// ----------------------------------------------------------------------------
// keyboard handling
// ----------------------------------------------------------------------------

void wxVListBox::OnKeyDown(wxKeyEvent& event)
{
    // flags for DoHandleItemClick()
    int flags = ItemClick_Kbd;

    int current;
    switch ( event.GetKeyCode() )
    {
        case WXK_HOME:
            current = 0;
            break;

        case WXK_END:
            current = GetLineCount() - 1;
            break;

        case WXK_DOWN:
            if ( m_current == (int)GetLineCount() - 1 )
                return;

            current = m_current + 1;
            break;

        case WXK_UP:
            if ( m_current == wxNOT_FOUND )
                current = GetLineCount() - 1;
            else if ( m_current != 0 )
                current = m_current - 1;
            else // m_current == 0
                return;
            break;

        case WXK_PAGEDOWN:
        case WXK_NEXT:
            PageDown();
            current = GetFirstVisibleLine();
            break;

        case WXK_PAGEUP:
        case WXK_PRIOR:
            if ( m_current == (int)GetFirstVisibleLine() )
            {
                PageUp();
            }

            current = GetFirstVisibleLine();
            break;

        case WXK_SPACE:
            // hack: pressing space should work like a mouse click rather than
            // like a keyboard arrow press, so trick DoHandleItemClick() in
            // thinking we were clicked
            flags &= ~ItemClick_Kbd;
            current = m_current;
            break;

#ifdef __WXMSW__
        case WXK_TAB:
            // Since we are using wxWANTS_CHARS we need to send navigation
            // events for the tabs on MSW
            {
                wxNavigationKeyEvent ne;
                ne.SetDirection(!event.ShiftDown());
                ne.SetCurrentFocus(this);
                ne.SetEventObject(this);
                GetParent()->GetEventHandler()->ProcessEvent(ne);
            }
            // fall through to default
#endif
        default:
            event.Skip();
            current = 0; // just to silent the stupid compiler warnings
            wxUnusedVar(current);
            return;
    }

    if ( event.ShiftDown() )
       flags |= ItemClick_Shift;
    if ( event.ControlDown() )
        flags |= ItemClick_Ctrl;

    DoHandleItemClick(current, flags);
}

// ----------------------------------------------------------------------------
// wxVListBox mouse handling
// ----------------------------------------------------------------------------

void wxVListBox::OnLeftDown(wxMouseEvent& event)
{
    SetFocus();

    int item = HitTest(event.GetPosition());

    if ( item != wxNOT_FOUND )
    {
        int flags = 0;
        if ( event.ShiftDown() )
           flags |= ItemClick_Shift;

        // under Mac Apple-click is used in the same way as Ctrl-click
        // elsewhere
#ifdef __WXMAC__
        if ( event.MetaDown() )
#else
        if ( event.ControlDown() )
#endif
            flags |= ItemClick_Ctrl;

        DoHandleItemClick(item, flags);
    }
}

void wxVListBox::OnLeftDClick(wxMouseEvent& eventMouse)
{
    int item = HitTest(eventMouse.GetPosition());
    if ( item != wxNOT_FOUND )
    {

        // if item double-clicked was not yet selected, then treat
        // this event as a left-click instead
        if ( item == m_current )
        {
            wxCommandEvent event(wxEVT_COMMAND_LISTBOX_DOUBLECLICKED, GetId());
            event.SetEventObject(this);
            event.SetInt(item);

            (void)GetEventHandler()->ProcessEvent(event);
        }
        else
        {
            OnLeftDown(eventMouse);
        }
    
    }
}


// ----------------------------------------------------------------------------
// use the same default attributes as wxListBox
// ----------------------------------------------------------------------------

#include "wx/listbox.h"

//static
wxVisualAttributes
wxVListBox::GetClassDefaultAttributes(wxWindowVariant variant)
{
    return wxListBox::GetClassDefaultAttributes(variant);
}

#endif