]> git.saurik.com Git - wxWidgets.git/blobdiff - src/generic/treectlg.cpp
don't crash trying to dereference NULL m_selection (happens when showing a grid witho...
[wxWidgets.git] / src / generic / treectlg.cpp
index d16901dee43b4357e014cfbd75def25711688673..6d56dc596d4a7b890567776445d9d86f49c78deb 100644 (file)
@@ -45,7 +45,6 @@
 class WXDLLEXPORT wxGenericTreeItem;
 
 WX_DEFINE_EXPORTED_ARRAY(wxGenericTreeItem *, wxArrayGenericTreeItems);
-//WX_DEFINE_OBJARRAY(wxArrayTreeItemIds);
 
 // ----------------------------------------------------------------------------
 // constants
@@ -53,7 +52,7 @@ WX_DEFINE_EXPORTED_ARRAY(wxGenericTreeItem *, wxArrayGenericTreeItems);
 
 static const int NO_IMAGE = -1;
 
-#define PIXELS_PER_UNIT 10
+static const int PIXELS_PER_UNIT = 10;
 
 // ----------------------------------------------------------------------------
 // Aqua arrows
@@ -111,12 +110,16 @@ static const char *aqua_arrow_down[] = {
 class WXDLLEXPORT wxTreeRenameTimer: public wxTimer
 {
 public:
+    // start editing the current item after half a second (if the mouse hasn't
+    // been clicked/moved)
+    enum { DELAY = 500 };
+
     wxTreeRenameTimer( wxGenericTreeCtrl *owner );
 
-    void Notify();
+    virtual void Notify();
 
 private:
-    wxGenericTreeCtrl   *m_owner;
+    wxGenericTreeCtrl *m_owner;
 };
 
 // control used for in-place edit
@@ -149,6 +152,22 @@ private:
     DECLARE_EVENT_TABLE()
 };
 
+// timer used to clear wxGenericTreeCtrl::m_findPrefix if no key was pressed
+// for a sufficiently long time
+class WXDLLEXPORT wxTreeFindTimer : public wxTimer
+{
+public:
+    // reset the current prefix after half a second of inactivity
+    enum { DELAY = 500 };
+
+    wxTreeFindTimer( wxGenericTreeCtrl *owner ) { m_owner = owner; }
+
+    virtual void Notify() { m_owner->m_findPrefix.clear(); }
+
+private:
+    wxGenericTreeCtrl *m_owner;
+};
+
 // a tree item
 class WXDLLEXPORT wxGenericTreeItem
 {
@@ -368,7 +387,7 @@ void wxTreeTextCtrl::OnChar( wxKeyEvent &event )
 
         if (!wxPendingDelete.Member(this))
             wxPendingDelete.Append(this);
-            
+
         m_finished = TRUE;
         m_owner->SetFocus(); // This doesn't work. TODO.
 
@@ -424,7 +443,7 @@ void wxTreeTextCtrl::OnKillFocus( wxFocusEvent &event )
 
     (*m_accept) = TRUE;
     (*m_res) = GetValue();
-    
+
     if ((*m_res) != m_startValue)
         m_owner->OnRenameAccept();
 }
@@ -694,7 +713,9 @@ void wxGenericTreeCtrl::Init()
     m_isDragging = FALSE;
     m_dropTarget = m_oldSelection = (wxGenericTreeItem *)NULL;
 
-    m_renameTimer = new wxTreeRenameTimer( this );
+    m_renameTimer = NULL;
+    m_findTimer = NULL;
+
     m_lastOnSame = FALSE;
 
     m_normalFont = wxSystemSettings::GetFont( wxSYS_DEFAULT_GUI_FONT );
@@ -716,7 +737,7 @@ bool wxGenericTreeCtrl::Create(wxWindow *parent,
 #ifdef __WXMAC__
     int major,minor;
     wxGetOsVersion( &major, &minor );
-    
+
     if (style & wxTR_HAS_BUTTONS) style |= wxTR_MAC_BUTTONS;
     if (style & wxTR_HAS_BUTTONS) style &= ~wxTR_HAS_BUTTONS;
     style &= ~wxTR_LINES_AT_ROOT;
@@ -741,9 +762,9 @@ bool wxGenericTreeCtrl::Create(wxWindow *parent,
     wxScrolledWindow::Create( parent, id, pos, size,
                               style|wxHSCROLL|wxVSCROLL, name );
 
-        // If the tree display has no buttons, but does have
-        // connecting lines, we can use a narrower layout.
-        // It may not be a good idea to force this...
+    // If the tree display has no buttons, but does have
+    // connecting lines, we can use a narrower layout.
+    // It may not be a good idea to force this...
     if (!HasButtons() && !HasFlag(wxTR_NO_LINES))
     {
         m_indent= 10;
@@ -754,7 +775,8 @@ bool wxGenericTreeCtrl::Create(wxWindow *parent,
     SetValidator( validator );
 #endif
 
-    SetBackgroundColour( wxSystemSettings::GetColour( wxSYS_COLOUR_LISTBOX ) );
+    SetForegroundColour( wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOWTEXT) );
+    SetBackgroundColour( wxSystemSettings::GetColour(wxSYS_COLOUR_LISTBOX) );
 
 //  m_dottedPen = wxPen( "grey", 0, wxDOT );  too slow under XFree86
     m_dottedPen = wxPen( wxT("grey"), 0, 0 );
@@ -766,16 +788,21 @@ wxGenericTreeCtrl::~wxGenericTreeCtrl()
 {
     delete m_hilightBrush;
     delete m_hilightUnfocusedBrush;
-    
-    if (m_arrowRight) delete m_arrowRight;
-    if (m_arrowDown) delete m_arrowDown;
+
+    delete m_arrowRight;
+    delete m_arrowDown;
 
     DeleteAllItems();
 
     delete m_renameTimer;
-    if (m_ownsImageListNormal) delete m_imageListNormal;
-    if (m_ownsImageListState) delete m_imageListState;
-    if (m_ownsImageListButtons) delete m_imageListButtons;
+    delete m_findTimer;
+
+    if (m_ownsImageListNormal)
+        delete m_imageListNormal;
+    if (m_ownsImageListState)
+        delete m_imageListState;
+    if (m_ownsImageListButtons)
+        delete m_imageListButtons;
 }
 
 // -----------------------------------------------------------------------------
@@ -789,13 +816,13 @@ size_t wxGenericTreeCtrl::GetCount() const
 
 void wxGenericTreeCtrl::SetIndent(unsigned int indent)
 {
-    m_indent = indent;
+    m_indent = (unsigned short) indent;
     m_dirty = TRUE;
 }
 
 void wxGenericTreeCtrl::SetSpacing(unsigned int spacing)
 {
-    m_spacing = spacing;
+    m_spacing = (unsigned short) spacing;
     m_dirty = TRUE;
 }
 
@@ -1159,6 +1186,52 @@ wxTreeItemId wxGenericTreeCtrl::GetPrevVisible(const wxTreeItemId& item) const
     return wxTreeItemId();
 }
 
+// find the first item starting with the given prefix after the given item
+wxTreeItemId wxGenericTreeCtrl::FindItem(const wxTreeItemId& idParent,
+                                         const wxString& prefixOrig) const
+{
+    // match is case insensitive as this is more convenient to the user: having
+    // to press Shift-letter to go to the item starting with a capital letter
+    // would be too bothersome
+    wxString prefix = prefixOrig.Lower();
+
+    // determine the starting point: we shouldn't take the current item (this
+    // allows to switch between two items starting with the same letter just by
+    // pressing it) but we shouldn't jump to the next one if the user is
+    // continuing to type as otherwise he might easily skip the item he wanted
+    wxTreeItemId id = idParent;
+    if ( prefix.length() == 1 )
+    {
+        id = GetNext(id);
+    }
+
+    // look for the item starting with the given prefix after it
+    while ( id.IsOk() && !GetItemText(id).Lower().StartsWith(prefix) )
+    {
+        id = GetNext(id);
+    }
+
+    // if we haven't found anything...
+    if ( !id.IsOk() )
+    {
+        // ... wrap to the beginning
+        id = GetRootItem();
+        if ( HasFlag(wxTR_HIDE_ROOT) )
+        {
+            // can't select virtual root
+            id = GetNext(id);
+        }
+
+        // and try all the items (stop when we get to the one we started from)
+        while ( id != idParent && !GetItemText(id).Lower().StartsWith(prefix) )
+        {
+            id = GetNext(id);
+        }
+    }
+
+    return id;
+}
+
 // -----------------------------------------------------------------------------
 // operations
 // -----------------------------------------------------------------------------
@@ -1211,7 +1284,8 @@ wxTreeItemId wxGenericTreeCtrl::AddRoot(const wxString& text,
         // if root is hidden, make sure we can navigate
         // into children
         m_anchor->SetHasPlus();
-        Expand(m_anchor);
+        m_anchor->Expand();
+        CalculatePositions();
     }
 
     if (!HasFlag(wxTR_MULTIPLE))
@@ -1244,9 +1318,13 @@ wxTreeItemId wxGenericTreeCtrl::InsertItem(const wxTreeItemId& parentId,
         return AddRoot(text, image, selImage, data);
     }
 
-    int index = parent->GetChildren().Index((wxGenericTreeItem*) idPrevious.m_pItem);
-    wxASSERT_MSG( index != wxNOT_FOUND,
-                  wxT("previous item in wxGenericTreeCtrl::InsertItem() is not a sibling") );
+    int index = -1;
+    if (idPrevious.IsOk())
+    {
+        index = parent->GetChildren().Index((wxGenericTreeItem*) idPrevious.m_pItem);
+        wxASSERT_MSG( index != wxNOT_FOUND,
+                      wxT("previous item in wxGenericTreeCtrl::InsertItem() is not a sibling") );
+    }
 
     return DoInsertItem(parentId, (size_t)++index, text, image, selImage, data);
 }
@@ -1355,6 +1433,8 @@ void wxGenericTreeCtrl::Expand(const wxTreeItemId& itemId)
     wxGenericTreeItem *item = (wxGenericTreeItem*) itemId.m_pItem;
 
     wxCHECK_RET( item, _T("invalid item in wxGenericTreeCtrl::Expand") );
+    wxCHECK_RET( !HasFlag(wxTR_HIDE_ROOT) || itemId != GetRootItem(),
+                 _T("can't expand hidden root") );
 
     if ( !item->HasPlus() )
         return;
@@ -1399,6 +1479,9 @@ void wxGenericTreeCtrl::ExpandAll(const wxTreeItemId& item)
 
 void wxGenericTreeCtrl::Collapse(const wxTreeItemId& itemId)
 {
+    wxCHECK_RET( !HasFlag(wxTR_HIDE_ROOT) || itemId != GetRootItem(),
+                 _T("can't collapse hidden root") );
+
     wxGenericTreeItem *item = (wxGenericTreeItem*) itemId.m_pItem;
 
     if ( !item->IsExpanded() )
@@ -1561,8 +1644,8 @@ void wxGenericTreeCtrl::SelectItemRange(wxGenericTreeItem *item1, wxGenericTreeI
 }
 
 void wxGenericTreeCtrl::SelectItem(const wxTreeItemId& itemId,
-                            bool unselect_others,
-                            bool extended_select)
+                                   bool unselect_others,
+                                   bool extended_select)
 {
     wxCHECK_RET( itemId.IsOk(), wxT("invalid tree item") );
 
@@ -1644,7 +1727,7 @@ void wxGenericTreeCtrl::SelectItem(const wxTreeItemId& itemId,
 }
 
 void wxGenericTreeCtrl::FillArray(wxGenericTreeItem *item,
-                           wxArrayTreeItemIds &array) const
+                                  wxArrayTreeItemIds &array) const
 {
     if ( item->IsSelected() )
         array.Add(wxTreeItemId(item));
@@ -1679,10 +1762,22 @@ void wxGenericTreeCtrl::EnsureVisible(const wxTreeItemId& item)
 
     // first expand all parent branches
     wxGenericTreeItem *parent = gitem->GetParent();
-    while ( parent )
+
+    if ( HasFlag(wxTR_HIDE_ROOT) )
     {
-        Expand(parent);
-        parent = parent->GetParent();
+        while ( parent != m_anchor )
+        {
+            Expand(parent);
+            parent = parent->GetParent();
+        }
+    }
+    else
+    {
+        while ( parent )
+        {
+            Expand(parent);
+            parent = parent->GetParent();
+        }
     }
 
     //if (parent) CalculatePositions();
@@ -1838,7 +1933,10 @@ void wxGenericTreeCtrl::SetImageList(wxImageList *imageList)
     m_imageListNormal = imageList;
     m_ownsImageListNormal = FALSE;
     m_dirty = TRUE;
-    CalculateLineHeight();
+    // Don't do any drawing if we're setting the list to NULL,
+    // since we may be in the process of deleting the tree control.
+    if (imageList)
+        CalculateLineHeight();
 }
 
 void wxGenericTreeCtrl::SetStateImageList(wxImageList *imageList)
@@ -2061,7 +2159,7 @@ void wxGenericTreeCtrl::PaintLevel( wxGenericTreeItem *item, wxDC &dc, int level
             if (attr && attr->HasTextColour())
                 colText = attr->GetTextColour();
             else
-                colText = wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOWTEXT);
+                colText = GetForegroundColour();
         }
 
         // prepare to draw
@@ -2115,7 +2213,7 @@ void wxGenericTreeCtrl::PaintLevel( wxGenericTreeItem *item, wxDC &dc, int level
             else if (HasFlag(wxTR_TWIST_BUTTONS))
             {
                 // draw the twisty button here
-                
+
                 if (HasFlag(wxTR_AQUA_BUTTONS))
                 {
                     if (item->IsExpanded())
@@ -2337,7 +2435,9 @@ void wxGenericTreeCtrl::OnChar( wxKeyEvent &event )
     // right : open if parent and go next
     // home  : go to root
     // end   : go to last item without opening parents
-    switch (event.KeyCode())
+    // alnum : start or continue searching for the item with this prefix
+    int keyCode = event.KeyCode();
+    switch ( keyCode )
     {
         case '+':
         case WXK_ADD:
@@ -2397,7 +2497,6 @@ void wxGenericTreeCtrl::OnChar( wxKeyEvent &event )
                             // otherwise we return to where we came from
                             SelectItem( prev, unselect_others, extended_select );
                             m_key_current= (wxGenericTreeItem*) prev.m_pItem;
-                            EnsureVisible( prev );
                             break;
                         }
                     }
@@ -2415,7 +2514,6 @@ void wxGenericTreeCtrl::OnChar( wxKeyEvent &event )
 
                     SelectItem( prev, unselect_others, extended_select );
                     m_key_current=(wxGenericTreeItem*) prev.m_pItem;
-                    EnsureVisible( prev );
                 }
             }
             break;
@@ -2431,7 +2529,6 @@ void wxGenericTreeCtrl::OnChar( wxKeyEvent &event )
                 }
                 if (prev)
                 {
-                    EnsureVisible( prev );
                     SelectItem( prev, unselect_others, extended_select );
                 }
             }
@@ -2451,7 +2548,6 @@ void wxGenericTreeCtrl::OnChar( wxKeyEvent &event )
                     wxTreeItemId child = GetFirstChild( m_key_current, cookie );
                     SelectItem( child, unselect_others, extended_select );
                     m_key_current=(wxGenericTreeItem*) child.m_pItem;
-                    EnsureVisible( child );
                 }
                 else
                 {
@@ -2469,7 +2565,6 @@ void wxGenericTreeCtrl::OnChar( wxKeyEvent &event )
                     {
                         SelectItem( next, unselect_others, extended_select );
                         m_key_current=(wxGenericTreeItem*) next.m_pItem;
-                        EnsureVisible( next );
                     }
                 }
             }
@@ -2495,7 +2590,6 @@ void wxGenericTreeCtrl::OnChar( wxKeyEvent &event )
 
                 if ( last.IsOk() )
                 {
-                    EnsureVisible( last );
                     SelectItem( last, unselect_others, extended_select );
                 }
             }
@@ -2505,20 +2599,56 @@ void wxGenericTreeCtrl::OnChar( wxKeyEvent &event )
         case WXK_HOME:
             {
                 wxTreeItemId prev = GetRootItem();
-                if (!prev) break;
-                if (HasFlag(wxTR_HIDE_ROOT))
+                if (!prev)
+                    break;
+
+                if ( HasFlag(wxTR_HIDE_ROOT) )
                 {
                     long dummy;
                     prev = GetFirstChild(prev, dummy);
-                    if (!prev) break;
+                    if (!prev)
+                        break;
                 }
-                EnsureVisible( prev );
+
                 SelectItem( prev, unselect_others, extended_select );
             }
             break;
 
         default:
-            event.Skip();
+            // do not use wxIsalnum() here
+            if ( !event.HasModifiers() && 
+                 ((keyCode >= '0' && keyCode <= '9') ||
+                  (keyCode >= 'a' && keyCode <= 'z') ||
+                  (keyCode >= 'A' && keyCode <= 'Z' )))
+            {
+                // find the next item starting with the given prefix
+                char ch = (char)keyCode;
+                
+                wxTreeItemId id = FindItem(m_current, m_findPrefix + (wxChar)ch);
+                if ( !id.IsOk() )
+                {
+                    // no such item
+                    break;
+                }
+
+                SelectItem(id);
+
+                m_findPrefix += ch;
+
+                // also start the timer to reset the current prefix if the user
+                // doesn't press any more alnum keys soon -- we wouldn't want
+                // to use this prefix for a new item search
+                if ( !m_findTimer )
+                {
+                    m_findTimer = new wxTreeFindTimer(this);
+                }
+
+                m_findTimer->Start(wxTreeFindTimer::DELAY, wxTIMER_ONE_SHOT);
+            }
+            else
+            {
+                event.Skip();
+            }
     }
 }
 
@@ -2542,14 +2672,8 @@ wxTreeItemId wxGenericTreeCtrl::HitTest(const wxPoint& point, int& flags)
         return wxTreeItemId();
     }
 
-    wxClientDC dc(this);
-    PrepareDC(dc);
-    wxCoord x = dc.DeviceToLogicalX( point.x );
-    wxCoord y = dc.DeviceToLogicalY( point.y );
-    wxGenericTreeItem *hit =  m_anchor->HitTest(wxPoint(x, y),
-                                                this,
-                                                flags,
-                                                0 );
+    wxGenericTreeItem *hit =  m_anchor->HitTest(CalcUnscrolledPosition(point),
+                                                this, flags, 0);
     if (hit == NULL)
     {
         flags = wxTREE_HITTEST_NOWHERE;
@@ -2600,10 +2724,10 @@ void wxGenericTreeCtrl::Edit( const wxTreeItemId& item )
     if (m_dirty) wxYieldIfNeeded();
 
     wxString s = m_currentEdit->GetText();
-    int x = m_currentEdit->GetX();
-    int y = m_currentEdit->GetY();
     int w = m_currentEdit->GetWidth();
     int h = m_currentEdit->GetHeight();
+    int x, y;
+    CalcScrolledPosition(m_currentEdit->GetX(), m_currentEdit->GetY(), &x, &y);
 
     int image_h = 0;
     int image_w = 0;
@@ -2624,11 +2748,6 @@ void wxGenericTreeCtrl::Edit( const wxTreeItemId& item )
     x += image_w;
     w -= image_w + 4; // I don't know why +4 is needed
 
-    wxClientDC dc(this);
-    PrepareDC( dc );
-    x = dc.LogicalToDeviceX( x );
-    y = dc.LogicalToDeviceY( y );
-
     wxTreeTextCtrl *text = new wxTreeTextCtrl(this, -1,
                                               &m_renameAccept,
                                               &m_renameRes,
@@ -2677,21 +2796,15 @@ void wxGenericTreeCtrl::OnMouse( wxMouseEvent &event )
         return;
     }
 
-    wxClientDC dc(this);
-    PrepareDC(dc);
-    wxCoord x = dc.DeviceToLogicalX( event.GetX() );
-    wxCoord y = dc.DeviceToLogicalY( event.GetY() );
+    wxPoint pt = CalcUnscrolledPosition(event.GetPosition());
 
     int flags = 0;
-    wxGenericTreeItem *item = m_anchor->HitTest( wxPoint(x,y),
-                                                 this,
-                                                 flags,
-                                                 0 );
+    wxGenericTreeItem *item = m_anchor->HitTest(pt, this, flags, 0);
 
     if ( event.Dragging() && !m_isDragging )
     {
         if (m_dragCount == 0)
-            m_dragStart = wxPoint(x,y);
+            m_dragStart = pt;
 
         m_dragCount++;
 
@@ -2768,7 +2881,7 @@ void wxGenericTreeCtrl::OnMouse( wxMouseEvent &event )
         wxTreeEvent event(wxEVT_COMMAND_TREE_END_DRAG, GetId());
 
         event.m_item = (long) item;
-        event.m_pointDrag = wxPoint(x, y);
+        event.m_pointDrag = pt;
         event.SetEventObject(this);
 
         (void)GetEventHandler()->ProcessEvent(event);
@@ -2794,9 +2907,7 @@ void wxGenericTreeCtrl::OnMouse( wxMouseEvent &event )
         {
             wxTreeEvent nevent(wxEVT_COMMAND_TREE_ITEM_RIGHT_CLICK, GetId());
             nevent.m_item = (long) item;
-            CalcScrolledPosition(x, y,
-                                 &nevent.m_pointDrag.x,
-                                 &nevent.m_pointDrag.y);
+            nevent.m_pointDrag = CalcScrolledPosition(pt);
             nevent.SetEventObject(this);
             GetEventHandler()->ProcessEvent(nevent);
         }
@@ -2808,10 +2919,17 @@ void wxGenericTreeCtrl::OnMouse( wxMouseEvent &event )
                      (flags & wxTREE_HITTEST_ONITEMLABEL) &&
                      HasFlag(wxTR_EDIT_LABELS) )
                 {
-                    if ( m_renameTimer->IsRunning() )
-                        m_renameTimer->Stop();
+                    if ( m_renameTimer )
+                    {
+                        if ( m_renameTimer->IsRunning() )
+                            m_renameTimer->Stop();
+                    }
+                    else
+                    {
+                        m_renameTimer = new wxTreeRenameTimer( this );
+                    }
 
-                    m_renameTimer->Start( 100, TRUE );
+                    m_renameTimer->Start( wxTreeRenameTimer::DELAY, TRUE );
                 }
 
                 m_lastOnSame = FALSE;
@@ -2851,15 +2969,15 @@ void wxGenericTreeCtrl::OnMouse( wxMouseEvent &event )
             if ( event.LeftDClick() )
             {
                 // double clicking should not start editing the item label
-                m_renameTimer->Stop();
+                if ( m_renameTimer )
+                    m_renameTimer->Stop();
+
                 m_lastOnSame = FALSE;
 
                 // send activate event first
                 wxTreeEvent nevent( wxEVT_COMMAND_TREE_ITEM_ACTIVATED, GetId() );
                 nevent.m_item = (long) item;
-                CalcScrolledPosition(x, y,
-                                     &nevent.m_pointDrag.x,
-                                     &nevent.m_pointDrag.y);
+                nevent.m_pointDrag = CalcScrolledPosition(pt);
                 nevent.SetEventObject( this );
                 if ( !GetEventHandler()->ProcessEvent( nevent ) )
                 {
@@ -2895,7 +3013,10 @@ void wxGenericTreeCtrl::CalculateSize( wxGenericTreeItem *item, wxDC &dc )
     wxCoord text_w = 0;
     wxCoord text_h = 0;
 
-    if (item->IsBold())
+    wxTreeItemAttr *attr = item->GetAttributes();
+    if ( attr && attr->HasFont() )
+        dc.SetFont(attr->GetFont());
+    else if ( item->IsBold() )
         dc.SetFont(m_boldFont);
 
     dc.GetTextExtent( item->GetText(), &text_w, &text_h );
@@ -2989,20 +3110,14 @@ void wxGenericTreeCtrl::RefreshSubtree(wxGenericTreeItem *item)
 {
     if (m_dirty) return;
 
-    wxClientDC dc(this);
-    PrepareDC(dc);
-
-    int cw = 0;
-    int ch = 0;
-    GetClientSize( &cw, &ch );
+    wxSize client = GetClientSize();
 
     wxRect rect;
-    rect.x = dc.LogicalToDeviceX( 0 );
-    rect.width = cw;
-    rect.y = dc.LogicalToDeviceY( item->GetY() );
-    rect.height = ch;
+    CalcScrolledPosition(0, item->GetY(), NULL, &rect.y);
+    rect.width = client.x;
+    rect.height = client.y;
 
-    Refresh( TRUE, &rect );
+    Refresh(TRUE, &rect);
 
     AdjustMyScrollbars();
 }
@@ -3011,20 +3126,12 @@ void wxGenericTreeCtrl::RefreshLine( wxGenericTreeItem *item )
 {
     if (m_dirty) return;
 
-    wxClientDC dc(this);
-    PrepareDC( dc );
-
-    int cw = 0;
-    int ch = 0;
-    GetClientSize( &cw, &ch );
-
     wxRect rect;
-    rect.x = dc.LogicalToDeviceX( 0 );
-    rect.y = dc.LogicalToDeviceY( item->GetY() );
-    rect.width = cw;
+    CalcScrolledPosition(0, item->GetY(), NULL, &rect.y);
+    rect.width = GetClientSize().x;
     rect.height = GetLineHeight(item); //dc.GetCharHeight() + 6;
 
-    Refresh( TRUE, &rect );
+    Refresh(TRUE, &rect);
 }
 
 void wxGenericTreeCtrl::RefreshSelected()