splittree.cpp

wxGTK 是 wxWidgets 的 linux GTK+ (>2.2.3)版本。wxWidgets 是一个跨平台的 GUI 框架

static wxRect CombineRectangles(const wxRect& rect1, const wxRect& rect2)
{
    wxRect rect;

    int right1 = rect1.GetRight();
    int bottom1 = rect1.GetBottom();
    int right2 = rect2.GetRight();
    int bottom2 = rect2.GetBottom();

    wxPoint topLeft = wxPoint(wxMin(rect1.x, rect2.x), wxMin(rect1.y, rect2.y));
    wxPoint bottomRight = wxPoint(wxMax(right1, right2), wxMax(bottom1, bottom2));

    rect.x = topLeft.x; rect.y = topLeft.y;
    rect.SetRight(bottomRight.x);
    rect.SetBottom(bottomRight.y);

    return rect;
}


// Calculate the tree overall size so we can set the scrollbar
// correctly
void wxRemotelyScrolledTreeCtrl::CalcTreeSize(wxRect& rect)
{
    CalcTreeSize(GetRootItem(), rect);
}

void wxRemotelyScrolledTreeCtrl::CalcTreeSize(const wxTreeItemId& id, wxRect& rect)
{
    // More efficient implementation would be to find the last item (but how?)
    // Q: is the bounding rect relative to the top of the virtual tree workspace
    // or the top of the window? How would we convert?
    wxRect itemSize;
    if (GetBoundingRect(id, itemSize))
    {
        rect = CombineRectangles(rect, itemSize);
    }

    wxTreeItemIdValue cookie;
    wxTreeItemId childId = GetFirstChild(id, cookie);
    while (childId)
    {
        CalcTreeSize(childId, rect);
        childId = GetNextChild(childId, cookie);
    }
}

// Find the scrolled window that contains this control
wxScrolledWindow* wxRemotelyScrolledTreeCtrl::GetScrolledWindow() const
{
    wxWindow* parent = wxWindow::GetParent();
    while (parent)
    {
        if (parent->IsKindOf(CLASSINFO(wxScrolledWindow)))
            return (wxScrolledWindow*) parent;
        parent = parent->GetParent();
    }
    return NULL;
}

void wxRemotelyScrolledTreeCtrl::OnScroll(wxScrollWinEvent& event)
{
    int orient = event.GetOrientation();
    if (orient == wxHORIZONTAL)
    {
        event.Skip();
        return;
    }
    wxScrolledWindow* scrollWin = GetScrolledWindow();
    if (!scrollWin)
        return;

    int x, y;
    scrollWin->GetViewStart(& x, & y);

    ScrollToLine(-1, y);
}

/*
 * wxTreeCompanionWindow
 *
 * A window displaying values associated with tree control items.
 */

IMPLEMENT_CLASS(wxTreeCompanionWindow, wxWindow)

BEGIN_EVENT_TABLE(wxTreeCompanionWindow, wxWindow)
    EVT_PAINT(wxTreeCompanionWindow::OnPaint)
    EVT_SCROLLWIN(wxTreeCompanionWindow::OnScroll)
    EVT_TREE_ITEM_EXPANDED(-1, wxTreeCompanionWindow::OnExpand)
    EVT_TREE_ITEM_COLLAPSED(-1, wxTreeCompanionWindow::OnExpand)
END_EVENT_TABLE()

wxTreeCompanionWindow::wxTreeCompanionWindow(wxWindow* parent, wxWindowID id,
      const wxPoint& pos,
      const wxSize& sz,
      long style):
    wxWindow(parent, id, pos, sz, style)
{
    m_treeCtrl = NULL;
}

void wxTreeCompanionWindow::DrawItem(wxDC& dc, wxTreeItemId id, const wxRect& rect)
{
    // TEST CODE
#if 1
    if (m_treeCtrl)
    {
        wxString text = m_treeCtrl->GetItemText(id);
        dc.SetTextForeground(* wxBLACK);
        dc.SetBackgroundMode(wxTRANSPARENT);

        int textW, textH;
        dc.GetTextExtent(text, & textW, & textH);

        int x = 5;
        int y = rect.GetY() + wxMax(0, (rect.GetHeight() - textH) / 2);

        dc.DrawText(text, x, y);
    }
#endif
}

void wxTreeCompanionWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
{
    wxPaintDC dc(this);

    if (!m_treeCtrl)
        return;

        wxPen pen(wxSystemSettings::GetColour(wxSYS_COLOUR_3DLIGHT), 1, wxSOLID);
    dc.SetPen(pen);
    dc.SetBrush(* wxTRANSPARENT_BRUSH);
    wxFont font(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
    dc.SetFont(font);

    wxSize clientSize = GetClientSize();
    wxRect itemRect;
    wxTreeItemId h, lastH;
    for (h=m_treeCtrl->GetFirstVisibleItem();
         h.IsOk();
         h=m_treeCtrl->GetNextVisible(h))
    {
        if (m_treeCtrl->GetBoundingRect(h, itemRect))
        {
            int cy = itemRect.GetTop();
            wxRect drawItemRect(0, cy, clientSize.x, itemRect.GetHeight());

            lastH = h;

            // Draw the actual item
            DrawItem(dc, h, drawItemRect);
            dc.DrawLine(0, cy, clientSize.x, cy);
        }
        if (! m_treeCtrl->IsVisible(h))
            break;
    }
    if (lastH.IsOk() && m_treeCtrl->GetBoundingRect(lastH, itemRect))
    {
        int cy = itemRect.GetBottom();
        dc.DrawLine(0, cy, clientSize.x, cy);
    }
}

void wxTreeCompanionWindow::OnScroll(wxScrollWinEvent& event)
{
    int orient = event.GetOrientation();
    if (orient == wxHORIZONTAL)
    {
        event.Skip();
        return;
    }
    if (!m_treeCtrl)
        return;

    // TODO: scroll the window physically instead of just refreshing.
    Refresh(true);
}

void wxTreeCompanionWindow::OnExpand(wxTreeEvent& WXUNUSED(event))
{
    // TODO: something more optimized than simply refresh the whole
    // window when the tree is expanded/collapsed. Tricky.
    Refresh();
}

/*
 * wxThinSplitterWindow
 */

IMPLEMENT_CLASS(wxThinSplitterWindow, wxSplitterWindow)

BEGIN_EVENT_TABLE(wxThinSplitterWindow, wxSplitterWindow)
    EVT_SIZE(wxThinSplitterWindow::OnSize)
END_EVENT_TABLE()

wxThinSplitterWindow::wxThinSplitterWindow(wxWindow* parent, wxWindowID id,
      const wxPoint& pos,
      const wxSize& sz,
      long style):
      wxSplitterWindow(parent, id, pos, sz, style)
{
    wxColour faceColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE));
    m_facePen = new wxPen(faceColour, 1, wxSOLID);
    m_faceBrush = new wxBrush(faceColour, wxSOLID);
}

wxThinSplitterWindow::~wxThinSplitterWindow()
{
    delete m_facePen;
    delete m_faceBrush;
}


void wxThinSplitterWindow::SizeWindows()
{
    // The client size may have changed inbetween
    // the sizing of the first window and the sizing of
    // the second. So repeat SizeWindows.
    wxSplitterWindow::SizeWindows();
    wxSplitterWindow::SizeWindows();
}

// Tests for x, y over sash
bool wxThinSplitterWindow::SashHitTest(int x, int y, int WXUNUSED(tolerance))
{
    return wxSplitterWindow::SashHitTest(x, y, 4);
}

void wxThinSplitterWindow::DrawSash(wxDC& dc)
{
    if ( m_sashPosition == 0 || !m_windowTwo)
        return;
    if (GetWindowStyle() & wxSP_NOSASH)
        return;

    int w, h;
    GetClientSize(&w, &h);

    if ( m_splitMode == wxSPLIT_VERTICAL )
    {
        dc.SetPen(* m_facePen);
        dc.SetBrush(* m_faceBrush);
        int h1 = h-1;
        int y1 = 0;
        if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER && (GetWindowStyleFlag() & wxSP_3DBORDER) != wxSP_3DBORDER )
            h1 += 1; // Not sure why this is necessary...
        if ( (GetWindowStyleFlag() & wxSP_3DBORDER) == wxSP_3DBORDER)
        {
            y1 = 2; h1 -= 3;
        }
        dc.DrawRectangle(m_sashPosition, y1, GetSashSize(), h1);
    }
    else
    {
        dc.SetPen(* m_facePen);
        dc.SetBrush(* m_faceBrush);
        int w1 = w-1;
        int x1 = 0;
        if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER && (GetWindowStyleFlag() & wxSP_3DBORDER) != wxSP_3DBORDER )
            w1 ++;
        if ( (GetWindowStyleFlag() & wxSP_3DBORDER) == wxSP_3DBORDER)
        {
            x1 = 2; w1 -= 3;
        }
        dc.DrawRectangle(x1, m_sashPosition, w1, GetSashSize());
    }

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

void wxThinSplitterWindow::OnSize(wxSizeEvent& event)
{
    wxSplitterWindow::OnSize(event);
}

/*
 * wxSplitterScrolledWindow
 */

IMPLEMENT_CLASS(wxSplitterScrolledWindow, wxScrolledWindow)

BEGIN_EVENT_TABLE(wxSplitterScrolledWindow, wxScrolledWindow)
    EVT_SCROLLWIN(wxSplitterScrolledWindow::OnScroll)
    EVT_SIZE(wxSplitterScrolledWindow::OnSize)
END_EVENT_TABLE()

wxSplitterScrolledWindow::wxSplitterScrolledWindow(wxWindow* parent, wxWindowID id,
      const wxPoint& pos,
      const wxSize& sz,
      long style):
      wxScrolledWindow(parent, id, pos, sz, style)
{
}

void wxSplitterScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
{
    wxSize sz = GetClientSize();
    if (GetChildren().GetFirst())
    {
        ((wxWindow*) GetChildren().GetFirst()->GetData())->SetSize(0, 0, sz.x, sz.y);
    }
}

void wxSplitterScrolledWindow::OnScroll(wxScrollWinEvent& event)
{
    // Ensure that events being propagated back up the window hierarchy
    // don't cause an infinite loop
    static bool inOnScroll = false;
    if (inOnScroll)
    {
        event.Skip();
        return;
    }
    inOnScroll = true;

    int orient = event.GetOrientation();

    int nScrollInc = CalcScrollInc(event);
    if (nScrollInc == 0)
    {
        inOnScroll = false;
        return;
    }

    if (orient == wxHORIZONTAL)
    {
        inOnScroll = false;
        event.Skip();
        return;
#if 0
        int newPos = m_xScrollPosition + nScrollInc;
        SetScrollPos(wxHORIZONTAL, newPos, true );
#endif
    }
    else
    {
        int newPos = m_yScrollPosition + nScrollInc;
        SetScrollPos(wxVERTICAL, newPos, true );
    }

    if (orient == wxHORIZONTAL)
    {
        m_xScrollPosition += nScrollInc;
    }
    else
    {
        m_yScrollPosition += nScrollInc;
    }

    // Find targets in splitter window and send the event to them
    wxWindowList::compatibility_iterator node = GetChildren().GetFirst();
    while (node)
    {
        wxWindow* child = (wxWindow*) node->GetData();
        if (child->IsKindOf(CLASSINFO(wxSplitterWindow)))
        {
            wxSplitterWindow* splitter = (wxSplitterWindow*) child;
            if (splitter->GetWindow1())
                splitter->GetWindow1()->ProcessEvent(event);
            if (splitter->GetWindow2())
                splitter->GetWindow2()->ProcessEvent(event);
            break;
        }
        node = node->GetNext();
    }

    m_targetWindow->Update() ;

    inOnScroll = false;
}