gtk.cpp

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

    // draw the selected item specially
    if ( flags & wxCONTROL_SELECTED )
    {
        wxRect rectIn;
        DrawBorder(dc, wxBORDER_RAISED, rect, flags, &rectIn);

        DrawBackground(dc, wxSCHEME_COLOUR(m_scheme, CONTROL_CURRENT), rectIn);
    }

    rect.Deflate(MENU_HORZ_MARGIN, MENU_VERT_MARGIN);

    // draw the bitmap: use the bitmap provided or the standard checkmark for
    // the checkable items
    if ( geometryInfo )
    {
        wxBitmap bmp = bitmap;
        if ( !bmp.Ok() && (flags & wxCONTROL_CHECKABLE) )
        {
            bmp = GetCheckBitmap(flags);
        }

        if ( bmp.Ok() )
        {
            rect.SetRight(geometryInfo->GetLabelOffset());
            wxControlRenderer::DrawBitmap(dc, bmp, rect);
        }
    }
    //else: menubar items don't have bitmaps

    // draw the label
    if ( geometryInfo )
    {
        rect.x = geometryInfo->GetLabelOffset();
        rect.SetRight(geometryInfo->GetAccelOffset());
    }

    DrawLabel(dc, label, rect, flags, wxALIGN_CENTRE_VERTICAL, indexAccel);

    // draw the accel string
    if ( !accel.empty() )
    {
        // menubar items shouldn't have them
        wxCHECK_RET( geometryInfo, _T("accel strings only valid for menus") );

        rect.x = geometryInfo->GetAccelOffset();
        rect.SetRight(geometryInfo->GetSize().x);

        // NB: no accel index here
        DrawLabel(dc, accel, rect, flags, wxALIGN_CENTRE_VERTICAL);
    }

    // draw the submenu indicator
    if ( flags & wxCONTROL_ISSUBMENU )
    {
        wxCHECK_RET( geometryInfo, _T("wxCONTROL_ISSUBMENU only valid for menus") );

        rect.x = geometryInfo->GetSize().x - MENU_RIGHT_MARGIN;
        rect.width = MENU_RIGHT_MARGIN;

        DrawArrow(dc, wxRIGHT, rect, flags);
    }
}

void wxGTKRenderer::DrawMenuSeparator(wxDC& dc,
                                      wxCoord y,
                                      const wxMenuGeometryInfo& geomInfo)
{
    DrawHorizontalLine(dc, y + MENU_VERT_MARGIN, 0, geomInfo.GetSize().x);
}

wxSize wxGTKRenderer::GetMenuBarItemSize(const wxSize& sizeText) const
{
    wxSize size = sizeText;

    // TODO: make this configurable
    size.x += 2*MENU_HORZ_MARGIN;
    size.y += 2*MENU_VERT_MARGIN;

    return size;
}

wxMenuGeometryInfo *wxGTKRenderer::GetMenuGeometry(wxWindow *win,
                                                   const wxMenu& menu) const
{
    // prepare the dc: for now we draw all the items with the system font
    wxClientDC dc(win);
    dc.SetFont(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));

    // the height of a normal item
    wxCoord heightText = dc.GetCharHeight();

    // the total height
    wxCoord height = 0;

    // the max length of label and accel strings: the menu width is the sum of
    // them, even if they're for different items (as the accels should be
    // aligned)
    //
    // the max length of the bitmap is never 0 as Windows always leaves enough
    // space for a check mark indicator
    wxCoord widthLabelMax = 0,
            widthAccelMax = 0,
            widthBmpMax = MENU_LEFT_MARGIN;

    for ( wxMenuItemList::compatibility_iterator node = menu.GetMenuItems().GetFirst();
          node;
          node = node->GetNext() )
    {
        // height of this item
        wxCoord h;

        wxMenuItem *item = node->GetData();
        if ( item->IsSeparator() )
        {
            h = MENU_SEPARATOR_HEIGHT;
        }
        else // not separator
        {
            h = heightText;

            wxCoord widthLabel;
            dc.GetTextExtent(item->GetLabel(), &widthLabel, NULL);
            if ( widthLabel > widthLabelMax )
            {
                widthLabelMax = widthLabel;
            }

            wxCoord widthAccel;
            dc.GetTextExtent(item->GetAccelString(), &widthAccel, NULL);
            if ( widthAccel > widthAccelMax )
            {
                widthAccelMax = widthAccel;
            }

            const wxBitmap& bmp = item->GetBitmap();
            if ( bmp.Ok() )
            {
                wxCoord widthBmp = bmp.GetWidth();
                if ( widthBmp > widthBmpMax )
                    widthBmpMax = widthBmp;
            }
            //else if ( item->IsCheckable() ): no need to check for this as
            // MENU_LEFT_MARGIN is big enough to show the check mark
        }

        h += 2*MENU_VERT_MARGIN;

        // remember the item position and height
        item->SetGeometry(height, h);

        height += h;
    }

    // bundle the metrics into a struct and return it
    wxGTKMenuGeometryInfo *gi = new wxGTKMenuGeometryInfo;

    gi->m_ofsLabel = widthBmpMax + 2*MENU_BMP_MARGIN;
    gi->m_ofsAccel = gi->m_ofsLabel + widthLabelMax;
    if ( widthAccelMax > 0 )
    {
        // if we actually have any accesl, add a margin
        gi->m_ofsAccel += MENU_ACCEL_MARGIN;
    }

    gi->m_heightItem = heightText + 2*MENU_VERT_MARGIN;

    gi->m_size.x = gi->m_ofsAccel + widthAccelMax + MENU_RIGHT_MARGIN;
    gi->m_size.y = height;

    return gi;
}

#endif // wxUSE_MENUS

// ----------------------------------------------------------------------------
// combobox
// ----------------------------------------------------------------------------

void wxGTKRenderer::InitComboBitmaps()
{
    wxSize sizeArrow = m_sizeScrollbarArrow;
    sizeArrow.x -= 2;
    sizeArrow.y -= 2;

    size_t n;

    for ( n = ComboState_Normal; n < ComboState_Max; n++ )
    {
        m_bitmapsCombo[n].Create(sizeArrow.x, sizeArrow.y);
    }

    static const int comboButtonFlags[ComboState_Max] =
    {
        0,
        wxCONTROL_CURRENT,
        wxCONTROL_PRESSED,
        wxCONTROL_DISABLED,
    };

    wxRect rect(sizeArrow);

    wxMemoryDC dc;
    for ( n = ComboState_Normal; n < ComboState_Max; n++ )
    {
        int flags = comboButtonFlags[n];

        dc.SelectObject(m_bitmapsCombo[n]);
        DrawSolidRect(dc, GetBackgroundColour(flags), rect);
        DrawArrow(dc, wxDOWN, rect, flags);
    }
}

void wxGTKRenderer::GetComboBitmaps(wxBitmap *bmpNormal,
                                    wxBitmap *bmpFocus,
                                    wxBitmap *bmpPressed,
                                    wxBitmap *bmpDisabled)
{
    if ( !m_bitmapsCombo[ComboState_Normal].Ok() )
    {
        InitComboBitmaps();
    }

    if ( bmpNormal )
        *bmpNormal = m_bitmapsCombo[ComboState_Normal];
    if ( bmpFocus )
        *bmpFocus = m_bitmapsCombo[ComboState_Focus];
    if ( bmpPressed )
        *bmpPressed = m_bitmapsCombo[ComboState_Pressed];
    if ( bmpDisabled )
        *bmpDisabled = m_bitmapsCombo[ComboState_Disabled];
}

// ----------------------------------------------------------------------------
// scrollbar
// ----------------------------------------------------------------------------

void wxGTKRenderer::DrawArrowBorder(wxDC& dc,
                                    wxRect *rect,
                                    wxDirection dir)
{
    static const wxDirection sides[] =
    {
        wxUP, wxLEFT, wxRIGHT, wxDOWN
    };

    wxRect rect1, rect2, rectInner;
    rect1 =
    rect2 =
    rectInner = *rect;

    rect2.Inflate(-1);
    rectInner.Inflate(-2);

    DrawSolidRect(dc, wxSCHEME_COLOUR(m_scheme, SCROLLBAR), *rect);

    // find the side not to draw and also adjust the rectangles to compensate
    // for it
    wxDirection sideToOmit;
    switch ( dir )
    {
        case wxUP:
            sideToOmit = wxDOWN;
            rect2.height += 1;
            rectInner.height += 1;
            break;

        case wxDOWN:
            sideToOmit = wxUP;
            rect2.y -= 1;
            rect2.height += 1;
            rectInner.y -= 2;
            rectInner.height += 1;
            break;

        case wxLEFT:
            sideToOmit = wxRIGHT;
            rect2.width += 1;
            rectInner.width += 1;
            break;

        case wxRIGHT:
            sideToOmit = wxLEFT;
            rect2.x -= 1;
            rect2.width += 1;
            rectInner.x -= 2;
            rectInner.width += 1;
            break;

        default:
            wxFAIL_MSG(_T("unknown arrow direction"));
            return;
    }

    // the outer rect first
    size_t n;
    for ( n = 0; n < WXSIZEOF(sides); n++ )
    {
        wxDirection side = sides[n];
        if ( side == sideToOmit )
            continue;

        DrawAntiShadedRectSide(dc, rect1, m_penDarkGrey, m_penHighlight, side);
    }

    // and then the inner one
    for ( n = 0; n < WXSIZEOF(sides); n++ )
    {
        wxDirection side = sides[n];
        if ( side == sideToOmit )
            continue;

        DrawAntiShadedRectSide(dc, rect2, m_penBlack, m_penGrey, side);
    }

    *rect = rectInner;
}

void wxGTKRenderer::DrawScrollbarArrow(wxDC& dc,
                                       wxDirection dir,
                                       const wxRect& rectArrow,
                                       int flags)
{
    // first of all, draw the border around it - but we don't want the border
    // on the side opposite to the arrow point
    wxRect rect = rectArrow;
    DrawArrowBorder(dc, &rect, dir);

    // then the arrow itself
    DrawArrow(dc, dir, rect, flags);
}

// gtk_default_draw_arrow() takes ~350 lines and we can't do much better here
// these people are just crazy :-(
void wxGTKRenderer::DrawArrow(wxDC& dc,
                              wxDirection dir,
                              const wxRect& rect,
                              int flags)
{
    enum
    {
        Point_First,
        Point_Second,
        Point_Third,
        Point_Max
    };

    wxPoint ptArrow[Point_Max];

    wxColour colInside = GetBackgroundColour(flags);
    wxPen penShadow[4];
    if ( flags & wxCONTROL_DISABLED )
    {
        penShadow[0] = m_penDarkGrey;
        penShadow[1] = m_penDarkGrey;
        penShadow[2] = wxNullPen;
        penShadow[3] = wxNullPen;
    }
    else if ( flags & wxCONTROL_PRESSED )
    {
        penShadow[0] = m_penDarkGrey;
        penShadow[1] = m_penHighlight;
        penShadow[2] = wxNullPen;
        penShadow[3] = m_penBlack;
    }
    else // normal arrow
    {
        penShadow[0] = m_penHighlight;
        penShadow[1] = m_penBlack;
        penShadow[2] = m_penDarkGrey;
        penShadow[3] = wxNullPen;
    }

    wxCoord middle;
    if ( dir == wxUP || dir == wxDOWN )
    {
        // horz middle
        middle = (rect.GetRight() + rect.GetLeft() + 1) / 2;
    }
    else // horz arrow
    {
        middle = (rect.GetTop() + rect.GetBottom() + 1) / 2;
    }

    // draw the arrow interior
    dc.SetPen(*wxTRANSPARENT_PEN);
    dc.SetBrush(colInside);

    switch ( dir )
    {
        case wxUP:
            ptArrow[Point_First].x = rect.GetLeft();
            ptArrow[Point_First].y = rect.GetBottom();
            ptArrow[Point_Second].x = middle;
            ptArrow[Point_Second].y = rect.GetTop();
            ptArrow[Point_Third].x = rect.GetRight();
            ptArrow[Point_Third].y = rect.GetBottom();
            break;

        case wxDOWN:
            ptArrow[Point_First] = rect.GetPosition();
            ptArrow[Point_Second].x = middle;
            ptArrow[Point_Second].y = rect.GetBottom();
            ptArrow[Point_Third].x = rect.GetRight();
            ptArrow[Point_Third].y = rect.GetTop();
            break;

        case wxLEFT:
            ptArrow[Point_First].x = rect.GetRight();
            ptArrow[Point_First].y = rect.GetTop();
            ptArrow[Point_Second].x = rect.GetLeft();
            ptArrow[Point_Second].y