corrected (?) wxStringList::Delete()

[wxWidgets.git] / samples / treectrl / treetest.cpp

diff --git a/samples/treectrl/treetest.cpp b/samples/treectrl/treetest.cpp
index 94a72b0d556884b729dc70dc1f0394c01829b81e..17d2ac3490bb6aeccb22f70fedb8a539dc7aa8ec 100644 (file)
--- a/samples/treectrl/treetest.cpp
+++ b/samples/treectrl/treetest.cpp
@@ -6,53 +6,65 @@
 // Created:     04/01/98
 // RCS-ID:      $Id$
 // Copyright:   (c) Julian Smart and Markus Holzem
 // Created:     04/01/98
 // RCS-ID:      $Id$
 // Copyright:   (c) Julian Smart and Markus Holzem

-// Licence:    wxWindows license
+// Licence:     wxWindows license

 /////////////////////////////////////////////////////////////////////////////
 
 #ifdef __GNUG__
 /////////////////////////////////////////////////////////////////////////////
 
 #ifdef __GNUG__

-#pragma implementation
-#pragma interface
+  #pragma implementation
+  #pragma interface

 #endif
 
 // For compilers that support precompilation, includes "wx/wx.h".
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
 #endif
 
 // For compilers that support precompilation, includes "wx/wx.h".
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__

-#pragma hdrstop
+  #pragma hdrstop

 #endif
 
 #ifndef WX_PRECOMP
 #endif
 
 #ifndef WX_PRECOMP

-#include "wx/wx.h"
+  #include "wx/wx.h"

 #endif
 
 #endif
 

+// under Windows the icons are in the .rc file

 #ifndef __WXMSW__
   #include "icon1.xpm"
   #include "icon2.xpm"
   #include "mondrian.xpm"
 #endif
 
 #ifndef __WXMSW__
   #include "icon1.xpm"
   #include "icon2.xpm"
   #include "mondrian.xpm"
 #endif
 

+#include "wx/log.h"
+
+#include "wx/imaglist.h"

 #include "wx/treectrl.h"
 
 #include "treetest.h"
 
 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 #include "wx/treectrl.h"
 
 #include "treetest.h"
 
 BEGIN_EVENT_TABLE(MyFrame, wxFrame)

-       EVT_MENU(TREE_QUIT, MyFrame::OnQuit)
-       EVT_MENU(TREE_ABOUT, MyFrame::OnAbout)
+  EVT_MENU(TreeTest_Quit, MyFrame::OnQuit)
+  EVT_MENU(TreeTest_About, MyFrame::OnAbout)
+  EVT_MENU(TreeTest_Dump, MyFrame::OnDump)
+  EVT_MENU(TreeTest_Bold, MyFrame::OnSetBold)
+  EVT_MENU(TreeTest_UnBold, MyFrame::OnClearBold)
+  EVT_MENU(TreeTest_Delete, MyFrame::OnDelete)
+  EVT_MENU(TreeTest_DeleteAll, MyFrame::OnDeleteAll)
+  EVT_MENU(TreeTest_Recreate, MyFrame::OnRecreate)

 END_EVENT_TABLE()
 
 BEGIN_EVENT_TABLE(MyTreeCtrl, wxTreeCtrl)
 END_EVENT_TABLE()
 
 BEGIN_EVENT_TABLE(MyTreeCtrl, wxTreeCtrl)

-       EVT_TREE_BEGIN_DRAG(TREE_CTRL, MyTreeCtrl::OnBeginDrag)
-       EVT_TREE_BEGIN_RDRAG(TREE_CTRL, MyTreeCtrl::OnBeginRDrag)
-       EVT_TREE_BEGIN_LABEL_EDIT(TREE_CTRL, MyTreeCtrl::OnBeginLabelEdit)
-       EVT_TREE_END_LABEL_EDIT(TREE_CTRL, MyTreeCtrl::OnEndLabelEdit)
-       EVT_TREE_DELETE_ITEM(TREE_CTRL, MyTreeCtrl::OnDeleteItem)
-       EVT_TREE_GET_INFO(TREE_CTRL, MyTreeCtrl::OnGetInfo)
-       EVT_TREE_SET_INFO(TREE_CTRL, MyTreeCtrl::OnSetInfo)
-       EVT_TREE_ITEM_EXPANDED(TREE_CTRL, MyTreeCtrl::OnItemExpanded)
-       EVT_TREE_ITEM_EXPANDING(TREE_CTRL, MyTreeCtrl::OnItemExpanding)
-       EVT_TREE_SEL_CHANGED(TREE_CTRL, MyTreeCtrl::OnSelChanged)
-       EVT_TREE_SEL_CHANGING(TREE_CTRL, MyTreeCtrl::OnSelChanging)
-       EVT_TREE_KEY_DOWN(TREE_CTRL, MyTreeCtrl::OnKeyDown)
+  EVT_TREE_BEGIN_DRAG(TreeTest_Ctrl, MyTreeCtrl::OnBeginDrag)
+  EVT_TREE_BEGIN_RDRAG(TreeTest_Ctrl, MyTreeCtrl::OnBeginRDrag)
+  EVT_TREE_BEGIN_LABEL_EDIT(TreeTest_Ctrl, MyTreeCtrl::OnBeginLabelEdit)
+  EVT_TREE_END_LABEL_EDIT(TreeTest_Ctrl, MyTreeCtrl::OnEndLabelEdit)
+  EVT_TREE_DELETE_ITEM(TreeTest_Ctrl, MyTreeCtrl::OnDeleteItem)
+  EVT_TREE_GET_INFO(TreeTest_Ctrl, MyTreeCtrl::OnGetInfo)
+  EVT_TREE_SET_INFO(TreeTest_Ctrl, MyTreeCtrl::OnSetInfo)
+  EVT_TREE_ITEM_EXPANDED(TreeTest_Ctrl, MyTreeCtrl::OnItemExpanded)
+  EVT_TREE_ITEM_EXPANDING(TreeTest_Ctrl, MyTreeCtrl::OnItemExpanding)
+  EVT_TREE_ITEM_COLLAPSED(TreeTest_Ctrl, MyTreeCtrl::OnItemCollapsed)
+  EVT_TREE_ITEM_COLLAPSING(TreeTest_Ctrl, MyTreeCtrl::OnItemCollapsing)
+  EVT_TREE_SEL_CHANGED(TreeTest_Ctrl, MyTreeCtrl::OnSelChanged)
+  EVT_TREE_SEL_CHANGING(TreeTest_Ctrl, MyTreeCtrl::OnSelChanging)
+  EVT_TREE_KEY_DOWN(TreeTest_Ctrl, MyTreeCtrl::OnTreeKeyDown)

 END_EVENT_TABLE()
 
 IMPLEMENT_APP(MyApp)
 END_EVENT_TABLE()
 
 IMPLEMENT_APP(MyApp)


@@ -61,320 +73,277 @@ IMPLEMENT_APP(MyApp)
 bool MyApp::OnInit()
 {
   // Create the main frame window
 bool MyApp::OnInit()
 {
   // Create the main frame window

-  MyFrame *frame = new MyFrame((wxFrame *) NULL, (char *) "wxTreeCtrl Test", 50, 50, 450, 340);
+  MyFrame *frame = new MyFrame("wxTreeCtrl Test", 50, 50, 450, 340);

 
 

-  // This reduces flicker effects - even better would be to define OnEraseBackground
-  // to do nothing. When the tree control's scrollbars are show or hidden, the
-  // frame is sent a background erase event.
-  frame->SetBackgroundColour(wxColour(255, 255, 255));
+  // Show the frame
+  frame->Show(TRUE);
+  SetTopWindow(frame);

 
 

-  // Give it an icon
-  frame->SetIcon(wxICON(mondrian));
+  return TRUE;
+}

 
 

-  // Make an image list containing small icons
-  m_imageListNormal = new wxImageList(16, 16, TRUE);

 
 

-  m_imageListNormal->Add(wxICON(icon1));
-  m_imageListNormal->Add(wxICON(icon2));
+// My frame constructor
+MyFrame::MyFrame(const wxString& title, int x, int y, int w, int h)
+       : wxFrame((wxFrame *)NULL, -1, title, wxPoint(x, y), wxSize(w, h))
+{
+  // This reduces flicker effects - even better would be to define
+  // OnEraseBackground to do nothing. When the tree control's scrollbars are
+  // show or hidden, the frame is sent a background erase event.
+  SetBackgroundColour(wxColour(255, 255, 255));
+
+  // Give it an icon
+  SetIcon(wxICON(mondrian));

 
   // Make a menubar
   wxMenu *file_menu = new wxMenu;
 
 
   // Make a menubar
   wxMenu *file_menu = new wxMenu;
 

-  file_menu->Append(TREE_ABOUT, "&About");
-  file_menu->Append(TREE_QUIT, "E&xit");
+  file_menu->Append(TreeTest_Dump, "D&ump tree items");
+  file_menu->Append(TreeTest_Delete, "&Delete this item");
+  file_menu->Append(TreeTest_DeleteAll, "Delete &all items");
+  file_menu->Append(TreeTest_Recreate, "&Recreate the tree");
+  file_menu->AppendSeparator();
+  file_menu->Append(TreeTest_Bold, "Make item &bold");
+  file_menu->Append(TreeTest_UnBold, "Make item &not bold");
+  file_menu->AppendSeparator();
+  file_menu->Append(TreeTest_About, "&About...");
+  file_menu->AppendSeparator();
+  file_menu->Append(TreeTest_Quit, "E&xit");
+

   wxMenuBar *menu_bar = new wxMenuBar;
   menu_bar->Append(file_menu, "&File");
   wxMenuBar *menu_bar = new wxMenuBar;
   menu_bar->Append(file_menu, "&File");

-  frame->SetMenuBar(menu_bar);
+  SetMenuBar(menu_bar);

 
   // Make a panel with a message
 
   // Make a panel with a message

-  frame->m_treeCtrl = new MyTreeCtrl(frame, TREE_CTRL, wxPoint(0, 0), wxSize(400, 200),
-       wxTR_HAS_BUTTONS|wxSUNKEN_BORDER);
-  frame->m_logWindow = new wxTextCtrl(frame, -1, "", wxPoint(0, 0), wxSize(400, 200),
-       wxTE_MULTILINE|wxSUNKEN_BORDER);
+  m_treeCtrl = new MyTreeCtrl(this, TreeTest_Ctrl,
+                              wxDefaultPosition, wxDefaultSize,
+                              wxTR_HAS_BUTTONS | wxSUNKEN_BORDER);
+  wxTextCtrl *textCtrl = new wxTextCtrl(this, -1, "",
+                                        wxDefaultPosition, wxDefaultSize,
+                                        wxTE_MULTILINE | wxSUNKEN_BORDER);

 
   wxLayoutConstraints *c = new wxLayoutConstraints;
 
   wxLayoutConstraints *c = new wxLayoutConstraints;

-  c->top.SameAs                        (frame, wxTop);
-  c->left.SameAs               (frame, wxLeft);
-  c->right.SameAs              (frame, wxRight);
-  c->height.PercentOf  (frame, wxHeight, 66);
-  frame->m_treeCtrl->SetConstraints(c);
+  c->top.SameAs(this, wxTop);
+  c->left.SameAs(this, wxLeft);
+  c->right.SameAs(this, wxRight);
+  c->height.PercentOf(this, wxHeight, 66);
+  m_treeCtrl->SetConstraints(c);

 
   c = new wxLayoutConstraints;
 
   c = new wxLayoutConstraints;

-  c->top.Below                 (frame->m_treeCtrl);
-  c->left.SameAs               (frame, wxLeft);
-  c->right.SameAs              (frame, wxRight);
-  c->bottom.SameAs             (frame, wxBottom);
-  frame->m_logWindow->SetConstraints(c);
-  frame->SetAutoLayout(TRUE);
-
-  frame->m_treeCtrl->SetImageList(wxGetApp().m_imageListNormal, wxIMAGE_LIST_NORMAL);
-
-  wxTreeItemId rootId = frame->m_treeCtrl->AddRoot("Root", 0);
-
-  char buf[20];
-  int i;
-  wxString str;
-
-  for ( i = 0; i < 10; i++)
-  {
-       sprintf(buf, "Folder child %d", i);
-    str = buf;
-    wxTreeItemId id = frame->m_treeCtrl->AppendItem(rootId, str, 0);
-       int j;
-    for ( j = 0; j < 5; j++)
-    {
-         sprintf(buf, "File child %d", j);
-      str = buf;
-      frame->m_treeCtrl->AppendItem(id, str, 1);
-    }
-  }
-  for ( i = 0; i < 10; i++)
-  {
-       sprintf(buf, "File child %d", i);
-    str = buf;
-    frame->m_treeCtrl->AppendItem(rootId, str, 1);
-  }
-
-  frame->CreateStatusBar(3);
-  frame->SetStatusText("", 0);
-
-  // Show the frame
-  frame->Show(TRUE);
-  
-  SetTopWindow(frame);
-
-  return TRUE;
-}
-
-// My frame constructor
-MyFrame::MyFrame(wxFrame *frame, char *title, int x, int y, int w, int h):
-  wxFrame(frame, -1, title, wxPoint(x, y), wxSize(w, h))
-{
-       m_treeCtrl = (MyTreeCtrl *) NULL;
-       m_logWindow = (wxTextCtrl *) NULL;
+  c->top.Below(m_treeCtrl);
+  c->left.SameAs(this, wxLeft);
+  c->right.SameAs(this, wxRight);
+  c->bottom.SameAs(this, wxBottom);
+  textCtrl->SetConstraints(c);
+  SetAutoLayout(TRUE);
+
+  // create a status bar with 3 panes
+  CreateStatusBar(3);
+  SetStatusText("", 0);
+
+#ifdef __WXMOTIF__
+  // For some reason, we get a memcpy crash in wxLogStream::DoLogStream
+  // on gcc/wxMotif, if we use wxLogTextCtl. Maybe it's just gcc?
+  delete wxLog::SetActiveTarget(new wxLogStderr);
+#else
+  // set our text control as the log target
+  wxLogTextCtrl *logWindow = new wxLogTextCtrl(textCtrl);
+  delete wxLog::SetActiveTarget(logWindow);
+#endif

 }
 
 MyFrame::~MyFrame()
 {
 }
 
 MyFrame::~MyFrame()
 {

-       delete wxGetApp().m_imageListNormal;
+  delete wxLog::SetActiveTarget(NULL);

 }
 
 }
 

-void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event) )
+void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))

 {
   Close(TRUE);
 }
 
 {
   Close(TRUE);
 }
 

-void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event) )
+void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))

 {
 {

-  wxMessageDialog dialog(this, "Tree test sample\nJulian Smart (c) 1997",
-       "About tree test", wxOK|wxCANCEL);
+  wxMessageDialog dialog(this,
+                         "Tree test sample\n"
+                         "Julian Smart (c) 1997",
+                         "About tree test", wxOK);

 
   dialog.ShowModal();
 }
 
 
   dialog.ShowModal();
 }
 

-// MyTreeCtrl
-
-void MyTreeCtrl::OnBeginDrag(wxTreeEvent& WXUNUSED(event) )
+void MyFrame::OnDump(wxCommandEvent& WXUNUSED(event))

 {
 {

-       if ( !wxGetApp().GetTopWindow() )
-               return;
-
-       wxTextCtrl *text = ((MyFrame *)wxGetApp().GetTopWindow())->m_logWindow;
-       if ( !text )
-               return;
-
-#ifndef __GNUWIN32__
-       ostream str(text);
-
-       str << "OnBeginDrag\n";
-       str.flush();
-#endif
+  wxTreeItemId root = m_treeCtrl->GetSelection();
+  m_treeCtrl->GetItemsRecursively(root, -1);

 }
 
 }
 

-void MyTreeCtrl::OnBeginRDrag(wxTreeEvent& WXUNUSED(event) )
+void MyFrame::DoSetBold(bool bold)

 {
 {

-       if ( !wxGetApp().GetTopWindow() )
-               return;
-
-       wxTextCtrl *text = ((MyFrame *)wxGetApp().GetTopWindow())->m_logWindow;
-       if ( !text )
-               return;
-
-#ifndef __GNUWIN32__
-       ostream str(text);
-
-       str << "OnBeginRDrag\n";
-       str.flush();
-#endif
+  m_treeCtrl->SetItemBold(m_treeCtrl->GetSelection(), bold);

 }
 
 }
 

-void MyTreeCtrl::OnBeginLabelEdit(wxTreeEvent& WXUNUSED(event) )
+void MyFrame::OnDelete(wxCommandEvent& WXUNUSED(event))

 {
 {

-       if ( !wxGetApp().GetTopWindow() )
-               return;
-
-       wxTextCtrl *text = ((MyFrame *)wxGetApp().GetTopWindow())->m_logWindow;
-       if ( !text )
-               return;
-
-#ifndef __GNUWIN32__
-       ostream str(text);
-
-       str << "OnBeginLabelEdit\n";
-       str.flush();
-#endif
+  wxTreeItemId item = m_treeCtrl->GetSelection();
+  m_treeCtrl->Delete(item);

 }
 
 }
 

-void MyTreeCtrl::OnEndLabelEdit(wxTreeEvent& WXUNUSED(event) )
+void MyFrame::OnDeleteAll(wxCommandEvent& WXUNUSED(event))

 {
 {

-       if ( !wxGetApp().GetTopWindow() )
-               return;
-
-       wxTextCtrl *text = ((MyFrame *)wxGetApp().GetTopWindow())->m_logWindow;
-       if ( !text )
-               return;
-
-#ifndef __GNUWIN32__
-       ostream str(text);
-
-       str << "OnEndLabelEdit\n";
-       str.flush();
-#endif
+  m_treeCtrl->DeleteAllItems();

 }
 
 }
 

-void MyTreeCtrl::OnDeleteItem(wxTreeEvent& WXUNUSED(event) )
+void MyFrame::OnRecreate(wxCommandEvent& event)

 {
 {

-       if ( !wxGetApp().GetTopWindow() )
-               return;
-
-       wxTextCtrl *text = ((MyFrame *)wxGetApp().GetTopWindow())->m_logWindow;
-       if ( !text )
-               return;
-
-#ifndef __GNUWIN32__
-       ostream str(text);
-
-       str << "OnDeleteItem\n";
-       str.flush();
-#endif
+  OnDeleteAll(event);
+  m_treeCtrl->AddTestItemsToTree(3, 2);

 }
 
 }
 

-void MyTreeCtrl::OnGetInfo(wxTreeEvent& WXUNUSED(event) )
+// MyTreeCtrl implementation
+MyTreeCtrl::MyTreeCtrl(wxWindow *parent, const wxWindowID id,
+                       const wxPoint& pos, const wxSize& size,
+                       long style)
+          : wxTreeCtrl(parent, id, pos, size, style)

 {
 {

-       if ( !wxGetApp().GetTopWindow() )
-               return;
+  // Make an image list containing small icons
+  m_imageListNormal = new wxImageList(16, 16, TRUE);

 
 

-       wxTextCtrl *text = ((MyFrame *)wxGetApp().GetTopWindow())->m_logWindow;
-       if ( !text )
-               return;
+  // should correspond to TreeCtrlIcon_xxx enum
+  m_imageListNormal->Add(wxICON(icon1));
+  m_imageListNormal->Add(wxICON(icon2));

 
 

-#ifndef __GNUWIN32__
-       ostream str(text);
+  SetImageList(m_imageListNormal);

 
 

-       str << "OnGetInfo\n";
-       str.flush();
-#endif
+  // Add some items to the tree
+  AddTestItemsToTree(3, 2);

 }
 
 }
 

-void MyTreeCtrl::OnSetInfo(wxTreeEvent& WXUNUSED(event) )
+MyTreeCtrl::~MyTreeCtrl()

 {
 {

-       if ( !wxGetApp().GetTopWindow() )
-               return;
-
-       wxTextCtrl *text = ((MyFrame *)wxGetApp().GetTopWindow())->m_logWindow;
-       if ( !text )
-               return;
-
-#ifndef __GNUWIN32__
-       ostream str(text);
-
-       str << "OnSetInfo\n";
-       str.flush();
-#endif
+  delete m_imageListNormal;

 }
 
 }
 

-void MyTreeCtrl::OnItemExpanded(wxTreeEvent& WXUNUSED(event) )
+void MyTreeCtrl::AddItemsRecursively(const wxTreeItemId& idParent,
+                                     size_t numChildren,
+                                     size_t depth,
+                                     size_t folder)

 {
 {

-       if ( !wxGetApp().GetTopWindow() )
-               return;
-
-       wxTextCtrl *text = ((MyFrame *)wxGetApp().GetTopWindow())->m_logWindow;
-       if ( !text )
-               return;
+  if ( depth > 0 )
+  {
+    wxString str;
+    for ( size_t n = 0; n < numChildren; n++ )
+    {
+      // at depth 1 elements won't have any more children
+      if (depth == 1)
+        str.Printf("%s child %d.%d", "File", folder, n + 1);
+      else
+        str.Printf("%s child %d","Folder", n + 1);
+
+      int image = depth == 1 ? TreeCtrlIcon_File : TreeCtrlIcon_Folder;
+      wxTreeItemId id = AppendItem(idParent, str, image, image,
+                                   new MyTreeItemData(str));
+      AddItemsRecursively(id, numChildren, depth - 1, n + 1);
+    }
+  }
+  //else: done!
+}

 
 

-#ifndef __GNUWIN32__
-       ostream str(text);
+void MyTreeCtrl::AddTestItemsToTree(size_t numChildren,
+                                    size_t depth)
+{
+  wxTreeItemId rootId = AddRoot("Root",
+                        TreeCtrlIcon_Folder, TreeCtrlIcon_Folder,
+                        new MyTreeItemData("Root item"));

 
 

-       str << "OnItemExpanded\n";
-       str.flush();
-#endif
+  AddItemsRecursively(rootId, numChildren, depth, 0);

 }
 
 }
 

-void MyTreeCtrl::OnItemExpanding(wxTreeEvent& WXUNUSED(event) )
+void MyTreeCtrl::GetItemsRecursively(const wxTreeItemId& idParent, long cookie)

 {
 {

-       if ( !wxGetApp().GetTopWindow() )
-               return;
+  wxTreeItemId id;

 
 

-       wxTextCtrl *text = ((MyFrame *)wxGetApp().GetTopWindow())->m_logWindow;
-       if ( !text )
-               return;
+  if( cookie == -1 )
+    id = GetFirstChild(idParent, cookie);
+  else
+    id = GetNextChild(idParent, cookie);

 
 

-#ifndef __GNUWIN32__
-       ostream str(text);
+  if(id <= 0)
+    return;

 
 

-       str << "OnItemExpanding\n";
-       str.flush();
-#endif
-}
+  wxString text=GetItemText(id);
+  wxLogMessage(text);

 
 

-void MyTreeCtrl::OnSelChanged(wxTreeEvent& WXUNUSED(event) )
-{
-       if ( !wxGetApp().GetTopWindow() )
-               return;
+  if (ItemHasChildren(id))
+    GetItemsRecursively(id,-1);

 
 

-       wxTextCtrl *text = ((MyFrame *)wxGetApp().GetTopWindow())->m_logWindow;
-       if ( !text )
-               return;
+  GetItemsRecursively(idParent, cookie);
+}

 
 

-#ifndef __GNUWIN32__
-       ostream str(text);

 
 

-       str << "OnSelChanged\n";
-       str.flush();
-#endif
-}
+// avoid repetition
+#define TREE_EVENT_HANDLER(name)                                \
+    void MyTreeCtrl::name(wxTreeEvent& WXUNUSED(event))         \
+    {                                                           \
+      wxLogMessage(#name);                                      \
+    }

 
 

-void MyTreeCtrl::OnSelChanging(wxTreeEvent& WXUNUSED(event) )
+TREE_EVENT_HANDLER(OnBeginDrag)
+TREE_EVENT_HANDLER(OnBeginRDrag)
+TREE_EVENT_HANDLER(OnBeginLabelEdit)
+TREE_EVENT_HANDLER(OnEndLabelEdit)
+TREE_EVENT_HANDLER(OnDeleteItem)
+TREE_EVENT_HANDLER(OnGetInfo)
+TREE_EVENT_HANDLER(OnSetInfo)
+TREE_EVENT_HANDLER(OnItemExpanded)
+TREE_EVENT_HANDLER(OnItemExpanding)
+TREE_EVENT_HANDLER(OnItemCollapsed)
+TREE_EVENT_HANDLER(OnSelChanged)
+TREE_EVENT_HANDLER(OnSelChanging)
+
+#undef TREE_EVENT_HANDLER
+
+void MyTreeCtrl::OnItemCollapsing(wxTreeEvent& event)

 {
 {

-       if ( !wxGetApp().GetTopWindow() )
-               return;
+  wxLogMessage("OnItemCollapsing");

 
 

-       wxTextCtrl *text = ((MyFrame *)wxGetApp().GetTopWindow())->m_logWindow;
-       if ( !text )
-               return;
-
-#ifndef __GNUWIN32__
-       ostream str(text);
+  // for testing, prevent the user from collapsing the root item
+  wxTreeItemId itemId = event.GetItem();
+  if ( !GetParent(itemId).IsOk() )
+  {
+    wxMessageBox("You can't collapse the root item.");

 
 

-       str << "OnSelChanging\n";
-       str.flush();
-#endif
+    event.Veto();
+  }

 }
 
 }
 

-void MyTreeCtrl::OnKeyDown(wxTreeEvent& WXUNUSED(event) )
+void MyTreeCtrl::OnTreeKeyDown(wxTreeEvent&WXUNUSED(event))

 {
 {

-       if ( !wxGetApp().GetTopWindow() )
-               return;
+  // show some info about this item
+  wxTreeItemId itemId = GetSelection();
+  MyTreeItemData *item = (MyTreeItemData *)GetItemData(itemId);

 
 

-       wxTextCtrl *text = ((MyFrame *)wxGetApp().GetTopWindow())->m_logWindow;
-       if ( !text )
-               return;
+  if ( item != NULL )
+  {
+    item->ShowInfo(this);
+  }

 
 

-#ifndef __GNUWIN32__
-       ostream str(text);
+  wxLogMessage("OnTreeKeyDown");
+}

 
 

-       str << "OnKeyDown\n";
-       str.flush();
-#endif
+static inline const char *Bool2String(bool b)
+{
+  return b ? "" : "not ";

 }
 
 }
 

+void MyTreeItemData::ShowInfo(wxTreeCtrl *tree)
+{
+  wxLogMessage("Item '%s': %sselected, %sexpanded, %sbold,\n"
+               "%u children (%u immediately under this item).",
+               m_desc.c_str(),
+               Bool2String(tree->IsSelected(GetId())),
+               Bool2String(tree->IsExpanded(GetId())),
+               Bool2String(tree->IsBold(GetId())),
+               tree->GetChildrenCount(GetId()),
+               tree->GetChildrenCount(GetId(), FALSE));
+}