menu.cpp

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    return m_menuInfos[pos].IsEnabled();
}

void wxMenuBar::SetLabelTop(size_t pos, const wxString& label)
{
    wxCHECK_RET( pos < GetCount(), _T("invalid index in EnableTop") );

    if ( label != m_menuInfos[pos].GetLabel() )
    {
        m_menuInfos[pos].SetLabel(label);

        RefreshItem(pos);
    }
    //else: nothing to do
}

wxString wxMenuBar::GetLabelTop(size_t pos) const
{
    wxCHECK_MSG( pos < GetCount(), wxEmptyString, _T("invalid index in GetLabelTop") );

    return m_menuInfos[pos].GetLabel();
}

// ----------------------------------------------------------------------------
// wxMenuBar drawing
// ----------------------------------------------------------------------------

void wxMenuBar::RefreshAllItemsAfter(size_t pos)
{
    if ( !IsCreated() )
    {
        // no need to refresh if nothing is shown yet
        return;
    }

    wxRect rect = GetItemRect(pos);
    rect.width = GetClientSize().x - rect.x;
    RefreshRect(rect);
}

void wxMenuBar::RefreshItem(size_t pos)
{
    wxCHECK_RET( pos != (size_t)-1,
                 _T("invalid item in wxMenuBar::RefreshItem") );

    if ( !IsCreated() )
    {
        // no need to refresh if nothing is shown yet
        return;
    }

    RefreshRect(GetItemRect(pos));
}

void wxMenuBar::DoDraw(wxControlRenderer *renderer)
{
    wxDC& dc = renderer->GetDC();
    dc.SetFont(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));

    // redraw only the items which must be redrawn

    // we don't have to use GetUpdateClientRect() here because our client rect
    // is the same as total one
    wxRect rectUpdate = GetUpdateRegion().GetBox();

    int flagsMenubar = GetStateFlags();

    wxRect rect;
    rect.y = 0;
    rect.height = GetClientSize().y;

    wxCoord x = 0;
    size_t count = GetCount();
    for ( size_t n = 0; n < count; n++ )
    {
        if ( x > rectUpdate.GetRight() )
        {
            // all remaining items are to the right of rectUpdate
            break;
        }

        rect.x = x;
        rect.width = GetItemWidth(n);
        x += rect.width;
        if ( x < rectUpdate.x )
        {
            // this item is still to the left of rectUpdate
            continue;
        }

        int flags = flagsMenubar;
        if ( m_current != -1 && n == (size_t)m_current )
        {
            flags |= wxCONTROL_SELECTED;
        }

        if ( !IsEnabledTop(n) )
        {
            flags |= wxCONTROL_DISABLED;
        }

        GetRenderer()->DrawMenuBarItem
                       (
                            dc,
                            rect,
                            m_menuInfos[n].GetLabel(),
                            flags,
                            m_menuInfos[n].GetAccelIndex()
                       );
    }
}

// ----------------------------------------------------------------------------
// wxMenuBar geometry
// ----------------------------------------------------------------------------

wxRect wxMenuBar::GetItemRect(size_t pos) const
{
    wxASSERT_MSG( pos < GetCount(), _T("invalid menu bar item index") );
    wxASSERT_MSG( IsCreated(), _T("can't call this method yet") );

    wxRect rect;
    rect.x =
    rect.y = 0;
    rect.height = GetClientSize().y;

    for ( size_t n = 0; n < pos; n++ )
    {
        rect.x += GetItemWidth(n);
    }

    rect.width = GetItemWidth(pos);

    return rect;
}

wxSize wxMenuBar::DoGetBestClientSize() const
{
    wxSize size;
    if ( GetMenuCount() > 0 )
    {
        wxClientDC dc(wxConstCast(this, wxMenuBar));
        dc.SetFont(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
        dc.GetTextExtent(GetLabelTop(0), &size.x, &size.y);

        // adjust for the renderer we use
        size = GetRenderer()->GetMenuBarItemSize(size);
    }
    else // empty menubar
    {
        size.x =
        size.y = 0;
    }

    // the width is arbitrary, of course, for horizontal menubar
    size.x = 100;

    return size;
}

int wxMenuBar::GetMenuFromPoint(const wxPoint& pos) const
{
    if ( pos.x < 0 || pos.y < 0 || pos.y > GetClientSize().y )
        return -1;

    // do find it
    wxCoord x = 0;
    size_t count = GetCount();
    for ( size_t item = 0; item < count; item++ )
    {
        x += GetItemWidth(item);

        if ( x > pos.x )
        {
            return item;
        }
    }

    // to the right of the last menu item
    return -1;
}

// ----------------------------------------------------------------------------
// wxMenuBar menu operations
// ----------------------------------------------------------------------------

void wxMenuBar::SelectMenu(size_t pos)
{
    SetFocus();
    wxLogTrace(_T("mousecapture"), _T("Capturing mouse from wxMenuBar::SelectMenu"));
    CaptureMouse();

    DoSelectMenu(pos);
}

void wxMenuBar::DoSelectMenu(size_t pos)
{
    wxCHECK_RET( pos < GetCount(), _T("invalid menu index in DoSelectMenu") );

    int posOld = m_current;

    m_current = pos;

    if ( posOld != -1 )
    {
        // close the previous menu
        if ( IsShowingMenu() )
        {
            // restore m_shouldShowMenu flag after DismissMenu() which resets
            // it to false
            bool old = m_shouldShowMenu;

            DismissMenu();

            m_shouldShowMenu = old;
        }

        RefreshItem((size_t)posOld);
    }

    RefreshItem(pos);
}

void wxMenuBar::PopupMenu(size_t pos)
{
    wxCHECK_RET( pos < GetCount(), _T("invalid menu index in PopupCurrentMenu") );

    SetFocus();
    DoSelectMenu(pos);
    PopupCurrentMenu();
}

// ----------------------------------------------------------------------------
// wxMenuBar input handing
// ----------------------------------------------------------------------------

/*
   Note that wxMenuBar doesn't use wxInputHandler but handles keyboard and
   mouse in the same way under all platforms. This is because it doesn't derive
   from wxControl (which works with input handlers) but directly from wxWindow.

   Also, menu bar input handling is rather simple, so maybe it's not really
   worth making it themeable - at least I've decided against doing it now as it
   would merging the changes back into trunk more difficult. But it still could
   be done later if really needed.
 */

void wxMenuBar::OnKillFocus(wxFocusEvent& event)
{
    if ( m_current != -1 )
    {
        RefreshItem((size_t)m_current);

        m_current = -1;
    }

    event.Skip();
}

void wxMenuBar::OnLeftDown(wxMouseEvent& event)
{
    if ( HasCapture() )
    {
        OnDismiss();

        event.Skip();
    }
    else // we didn't have mouse capture, capture it now
    {
        m_current = GetMenuFromPoint(event.GetPosition());
        if ( m_current == -1 )
        {
            // unfortunately, we can't prevent wxMSW from giving us the focus,
            // so we can only give it back
            GiveAwayFocus();
        }
        else // on item
        {
            wxLogTrace(_T("mousecapture"), _T("Capturing mouse from wxMenuBar::OnLeftDown"));
            CaptureMouse();

            // show it as selected
            RefreshItem((size_t)m_current);

            // show the menu
            PopupCurrentMenu(false /* don't select first item - as Windows does */);
        }
    }
}

void wxMenuBar::OnMouseMove(wxMouseEvent& event)
{
    if ( HasCapture() )
    {
        (void)ProcessMouseEvent(event.GetPosition());
    }
    else
    {
        event.Skip();
    }
}

bool wxMenuBar::ProcessMouseEvent(const wxPoint& pt)
{
    // a hack to ignore the extra mouse events MSW sends us: this is similar to
    // wxUSE_MOUSEEVENT_HACK in wxWin itself but it isn't enough for us here as
    // we get the messages from different windows (old and new popup menus for
    // example)
#ifdef __WXMSW__
    static wxPoint s_ptLast;
    if ( pt == s_ptLast )
    {
        return false;
    }

    s_ptLast = pt;
#endif // __WXMSW__

    int currentNew = GetMenuFromPoint(pt);
    if ( (currentNew == -1) || (currentNew == m_current) )
    {
        return false;
    }

    // select the new active item
    DoSelectMenu(currentNew);

    // show the menu if we know that we should, even if we hadn't been showing
    // it before (this may happen if the previous menu was disabled)
    if ( m_shouldShowMenu && !m_menuShown)
    {
        // open the new menu if the old one we closed had been opened
        PopupCurrentMenu(false /* don't select first item - as Windows does */);
    }

    return true;
}

void wxMenuBar::OnKeyDown(wxKeyEvent& event)
{
    // ensure that we have a current item - we might not have it if we're
    // given the focus with Alt or F10 press (and under GTK+ the menubar
    // somehow gets the keyboard events even when it doesn't have focus...)
    if ( m_current == -1 )
    {
        if ( !HasCapture() )
        {
            SelectMenu(0);
        }
        else // we do have capture
        {
            // we always maintain a valid current item while we're in modal
            // state (i.e. have the capture)
            wxFAIL_MSG( _T("how did we manage to lose current item?") );

            return;
        }
    }

    int key = event.GetKeyCode();

    // first let the menu have it
    if ( IsShowingMenu() && m_menuShown->ProcessKeyDown(key) )
    {
        return;
    }

    // cycle through the menu items when left/right arrows are pressed and open
    // the menu when up/down one is
    switch ( key )
    {
        case WXK_ALT:
            // Alt must be processed at wxWindow level too
            event.Skip();
            // fall through

        case WXK_ESCAPE:
            // remove the selection and give the focus away
            if ( m_current != -1 )
            {
                if ( IsShowingMenu() )
                {
                    DismissMenu();
                }

                OnDismiss();
            }
            break;

        case WXK_LEFT:
        case WXK_RIGHT:
            {
                size_t count = GetCount();
                if ( count == 1 )
                {
                    // the item won't change anyhow
                    break;
                }
                //else: otherwise, it will

                // remember if we were showing a menu - if we did, we should
                // show the new menu after changing the item
                bool wasMenuOpened = IsShowingMenu();
                if ( wasMenuOpened )
                {
                    DismissMenu();
                }

                // cast is safe as we tested for -1 above
                size_t currentNew = (size_t)m_current;

                if ( key == WXK_LEFT )
                {
                    if ( currentNew-- == 0 )
                        currentNew = count - 1;
                }
                else // right
                {
                    if ( ++currentNew == count )
                        currentNew = 0;
                }

                DoSelectMenu(currentNew);

                if ( wasMenuOpened )
                {
                    PopupCurrentMenu();
                }
            }
            break;

        case WXK_DOWN:
        case WXK_UP:
        case WXK_RETURN:
            // open the menu
            PopupCurrentMenu();
            break;

        default:
            // letters open the corresponding menu
            {
                bool unique;
                int idxFound = FindNextItemForAccel(m_current, key, &unique);

                if ( idxFound != -1 )
                {
                    if ( IsShowingMenu() )
                    {
                        DismissMenu();
                    }

                    DoSelectMenu((size_t)idxFound);

                    // if the item is not unique, just select it but don't
                    // activate as the user might have wanted to activate
                    // another item
                    //
                    // also, don't try to open a disabled menu