sashwin.cpp

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                DrawSashTracker(m_draggingEdge, x, y);
            }
        }
        m_oldX = x;
        m_oldY = y;
    }
    else if ( event.LeftDClick() )
    {
        // Nothing
    }
    else
    {
    }
}

void wxSashWindow::OnSize(wxSizeEvent& WXUNUSED(event))
{
    SizeWindows();
}

wxSashEdgePosition wxSashWindow::SashHitTest(int x, int y, int WXUNUSED(tolerance))
{
    int cx, cy;
    GetClientSize(& cx, & cy);

    int i;
    for (i = 0; i < 4; i++)
    {
        wxSashEdge& edge = m_sashes[i];
        wxSashEdgePosition position = (wxSashEdgePosition) i ;

        if (edge.m_show)
        {
            switch (position)
            {
                case wxSASH_TOP:
                {
                    if (y >= 0 && y <= GetEdgeMargin(position))
                        return wxSASH_TOP;
                    break;
                }
                case wxSASH_RIGHT:
                {
                    if ((x >= cx - GetEdgeMargin(position)) && (x <= cx))
                        return wxSASH_RIGHT;
                    break;
                }
                case wxSASH_BOTTOM:
                {
                    if ((y >= cy - GetEdgeMargin(position)) && (y <= cy))
                        return wxSASH_BOTTOM;
                    break;
                }
                case wxSASH_LEFT:
                {
                    if ((x <= GetEdgeMargin(position)) && (x >= 0))
                        return wxSASH_LEFT;
                    break;
                }
                case wxSASH_NONE:
                {
                    break;
                }
            }
        }
    }
    return wxSASH_NONE;
}

// Draw 3D effect borders
void wxSashWindow::DrawBorders(wxDC& dc)
{
    int w, h;
    GetClientSize(&w, &h);

    wxPen mediumShadowPen(m_mediumShadowColour, 1, wxSOLID);
    wxPen darkShadowPen(m_darkShadowColour, 1, wxSOLID);
    wxPen lightShadowPen(m_lightShadowColour, 1, wxSOLID);
    wxPen hilightPen(m_hilightColour, 1, wxSOLID);

    if ( GetWindowStyleFlag() & wxSW_3DBORDER )
    {
        dc.SetPen(mediumShadowPen);
        dc.DrawLine(0, 0, w-1, 0);
        dc.DrawLine(0, 0, 0, h - 1);

        dc.SetPen(darkShadowPen);
        dc.DrawLine(1, 1, w-2, 1);
        dc.DrawLine(1, 1, 1, h-2);

        dc.SetPen(hilightPen);
        dc.DrawLine(0, h-1, w-1, h-1);
        dc.DrawLine(w-1, 0, w-1, h); // Surely the maximum y pos. should be h - 1.
                                     /// Anyway, h is required for MSW.

        dc.SetPen(lightShadowPen);
        dc.DrawLine(w-2, 1, w-2, h-2); // Right hand side
        dc.DrawLine(1, h-2, w-1, h-2);     // Bottom
    }
    else if ( GetWindowStyleFlag() & wxSW_BORDER )
    {
        dc.SetBrush(*wxTRANSPARENT_BRUSH);
        dc.SetPen(*wxBLACK_PEN);
        dc.DrawRectangle(0, 0, w-1, h-1);
    }

    dc.SetPen(wxNullPen);
    dc.SetBrush(wxNullBrush);
}

void wxSashWindow::DrawSashes(wxDC& dc)
{
    int i;
    for (i = 0; i < 4; i++)
        if (m_sashes[i].m_show)
            DrawSash((wxSashEdgePosition) i, dc);
}

// Draw the sash
void wxSashWindow::DrawSash(wxSashEdgePosition edge, wxDC& dc)
{
    int w, h;
    GetClientSize(&w, &h);

    wxPen facePen(m_faceColour, 1, wxSOLID);
    wxBrush faceBrush(m_faceColour, wxSOLID);
    wxPen mediumShadowPen(m_mediumShadowColour, 1, wxSOLID);
    wxPen darkShadowPen(m_darkShadowColour, 1, wxSOLID);
    wxPen lightShadowPen(m_lightShadowColour, 1, wxSOLID);
    wxPen hilightPen(m_hilightColour, 1, wxSOLID);
    wxColour blackClr(0, 0, 0);
    wxColour whiteClr(255, 255, 255);
    wxPen blackPen(blackClr, 1, wxSOLID);
    wxPen whitePen(whiteClr, 1, wxSOLID);

    if ( edge == wxSASH_LEFT || edge == wxSASH_RIGHT )
    {
        int sashPosition = (edge == wxSASH_LEFT) ? 0 : ( w - GetEdgeMargin(edge) );

        dc.SetPen(facePen);
        dc.SetBrush(faceBrush);
        dc.DrawRectangle(sashPosition, 0, GetEdgeMargin(edge), h);

        if (GetWindowStyleFlag() & wxSW_3DSASH)
        {
            if (edge == wxSASH_LEFT)
            {
                // Draw a dark grey line on the left to indicate that the
                // sash is raised
                dc.SetPen(mediumShadowPen);
                dc.DrawLine(GetEdgeMargin(edge), 0, GetEdgeMargin(edge), h);
            }
            else
            {
                // Draw a highlight line on the right to indicate that the
                // sash is raised
                dc.SetPen(hilightPen);
                dc.DrawLine(w - GetEdgeMargin(edge), 0, w - GetEdgeMargin(edge), h);
            }
        }
    }
    else // top or bottom
    {
        int sashPosition = (edge == wxSASH_TOP) ? 0 : ( h - GetEdgeMargin(edge) );

        dc.SetPen(facePen);
        dc.SetBrush(faceBrush);
        dc.DrawRectangle(0, sashPosition, w, GetEdgeMargin(edge));

        if (GetWindowStyleFlag() & wxSW_3DSASH)
        {
            if (edge == wxSASH_BOTTOM)
            {
                // Draw a highlight line on the bottom to indicate that the
                // sash is raised
                dc.SetPen(hilightPen);
                dc.DrawLine(0, h - GetEdgeMargin(edge), w, h - GetEdgeMargin(edge));
            }
            else
            {
                // Draw a drak grey line on the top to indicate that the
                // sash is raised
                dc.SetPen(mediumShadowPen);
                dc.DrawLine(1, GetEdgeMargin(edge), w-1, GetEdgeMargin(edge));
            }
        }
    }

    dc.SetPen(wxNullPen);
    dc.SetBrush(wxNullBrush);
}

// Draw the sash tracker (for whilst moving the sash)
void wxSashWindow::DrawSashTracker(wxSashEdgePosition edge, int x, int y)
{
    int w, h;
    GetClientSize(&w, &h);

    wxScreenDC screenDC;
    int x1, y1;
    int x2, y2;

    if ( edge == wxSASH_LEFT || edge == wxSASH_RIGHT )
    {
        x1 = x; y1 = 2;
        x2 = x; y2 = h-2;

        if ( (edge == wxSASH_LEFT) && (x1 > w) )
        {
            x1 = w; x2 = w;
        }
        else if ( (edge == wxSASH_RIGHT) && (x1 < 0) )
        {
            x1 = 0; x2 = 0;
        }
    }
    else
    {
        x1 = 2; y1 = y;
        x2 = w-2; y2 = y;

        if ( (edge == wxSASH_TOP) && (y1 > h) )
        {
            y1 = h;
            y2 = h;
        }
        else if ( (edge == wxSASH_BOTTOM) && (y1 < 0) )
        {
            y1 = 0;
            y2 = 0;
        }
    }

    ClientToScreen(&x1, &y1);
    ClientToScreen(&x2, &y2);

    wxPen sashTrackerPen(*wxBLACK, 2, wxSOLID);

    screenDC.SetLogicalFunction(wxINVERT);
    screenDC.SetPen(sashTrackerPen);
    screenDC.SetBrush(*wxTRANSPARENT_BRUSH);

    screenDC.DrawLine(x1, y1, x2, y2);

    screenDC.SetLogicalFunction(wxCOPY);

    screenDC.SetPen(wxNullPen);
    screenDC.SetBrush(wxNullBrush);
}

// Position and size subwindows.
// Note that the border size applies to each subwindow, not
// including the edges next to the sash.
void wxSashWindow::SizeWindows()
{
    int cw, ch;
    GetClientSize(&cw, &ch);

    if (GetChildren().GetCount() == 1)
    {
        wxWindow* child = GetChildren().GetFirst()->GetData();

        int x = 0;
        int y = 0;
        int width = cw;
        int height = ch;

        // Top
        if (m_sashes[0].m_show)
        {
            y = m_borderSize;
            height -= m_borderSize;
        }
        y += m_extraBorderSize;

        // Left
        if (m_sashes[3].m_show)
        {
            x = m_borderSize;
            width -= m_borderSize;
        }
        x += m_extraBorderSize;

        // Right
        if (m_sashes[1].m_show)
        {
            width -= m_borderSize;
        }
        width -= 2*m_extraBorderSize;

        // Bottom
        if (m_sashes[2].m_show)
        {
            height -= m_borderSize;
        }
        height -= 2*m_extraBorderSize;

        child->SetSize(x, y, width, height);
    }
    else if (GetChildren().GetCount() > 1)
    {
        // Perhaps multiple children are themselves sash windows.
        // TODO: this doesn't really work because the subwindows sizes/positions
        // must be set to leave a gap for the parent's sash (hit-test and decorations).
        // Perhaps we can allow for this within LayoutWindow, testing whether the parent
        // is a sash window, and if so, allowing some space for the edges.
        wxLayoutAlgorithm layout;
        layout.LayoutWindow(this);
    }

    wxClientDC dc(this);
    DrawBorders(dc);
    DrawSashes(dc);
}

// Initialize colours
void wxSashWindow::InitColours()
{
    // Shadow colours
    m_faceColour = wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE);
    m_mediumShadowColour = wxSystemSettings::GetColour(wxSYS_COLOUR_3DSHADOW);
    m_darkShadowColour = wxSystemSettings::GetColour(wxSYS_COLOUR_3DDKSHADOW);
    m_lightShadowColour = wxSystemSettings::GetColour(wxSYS_COLOUR_3DLIGHT);
    m_hilightColour = wxSystemSettings::GetColour(wxSYS_COLOUR_3DHILIGHT);
}

void wxSashWindow::SetSashVisible(wxSashEdgePosition edge, bool sash)
{
     m_sashes[edge].m_show = sash;
     if (sash)
        m_sashes[edge].m_margin = m_borderSize;
     else
        m_sashes[edge].m_margin = 0;
}

#if defined( __WXMSW__ ) || defined( __WXMAC__)

// this is currently called (and needed) under MSW only...
void wxSashWindow::OnSetCursor(wxSetCursorEvent& event)
{
    // if we don't do it, the resizing cursor might be set for child window:
    // and like this we explicitly say that our cursor should not be used for
    // children windows which overlap us

    if ( SashHitTest(event.GetX(), event.GetY()) != wxSASH_NONE)
    {
        // default processing is ok
        event.Skip();
    }
    //else: do nothing, in particular, don't call Skip()
}

#endif // wxMSW

#endif // wxUSE_SASH