fixes potential crash under gatekeeper

[wxWidgets.git] / samples / widgets / listbox.cpp

diff --git a/samples/widgets/listbox.cpp b/samples/widgets/listbox.cpp
index 82db40460672d8c1fa8a09f1e1f40439a51a4e02..9278c6306b67b975e002b1f5ef70cb8b141a61c8 100644 (file)
--- a/samples/widgets/listbox.cpp
+++ b/samples/widgets/listbox.cpp
@@ -6,7 +6,7 @@
 // Created:     27.03.01
 // Id:          $Id$
 // Copyright:   (c) 2001 Vadim Zeitlin
 // Created:     27.03.01
 // Id:          $Id$
 // Copyright:   (c) 2001 Vadim Zeitlin

-// License:     wxWindows license
+// Licence:     wxWindows licence

 /////////////////////////////////////////////////////////////////////////////
 
 // ============================================================================
 /////////////////////////////////////////////////////////////////////////////
 
 // ============================================================================


@@ -44,6 +44,7 @@
 
 #include "wx/checklst.h"
 
 
 #include "wx/checklst.h"
 

+#include "itemcontainer.h"

 #include "widgets.h"
 
 #include "icons/listbox.xpm"
 #include "widgets.h"
 
 #include "icons/listbox.xpm"


@@ -55,7 +56,7 @@
 // control ids
 enum
 {
 // control ids
 enum
 {

-    ListboxPage_Reset = 100,
+    ListboxPage_Reset = wxID_HIGHEST,

     ListboxPage_Add,
     ListboxPage_AddText,
     ListboxPage_AddSeveral,
     ListboxPage_Add,
     ListboxPage_AddText,
     ListboxPage_AddSeveral,


@@ -66,25 +67,33 @@ enum
     ListboxPage_Delete,
     ListboxPage_DeleteText,
     ListboxPage_DeleteSel,
     ListboxPage_Delete,
     ListboxPage_DeleteText,
     ListboxPage_DeleteSel,

-    ListboxPage_Listbox
+    ListboxPage_Listbox,
+    ListboxPage_EnsureVisible,
+    ListboxPage_EnsureVisibleText,
+    ListboxPage_ContainerTests

 };
 
 // ----------------------------------------------------------------------------
 // ListboxWidgetsPage
 // ----------------------------------------------------------------------------
 
 };
 
 // ----------------------------------------------------------------------------
 // ListboxWidgetsPage
 // ----------------------------------------------------------------------------
 

-class ListboxWidgetsPage : public WidgetsPage
+class ListboxWidgetsPage : public ItemContainerWidgetsPage

 {
 public:
 {
 public:

-    ListboxWidgetsPage(wxBookCtrlBase *book, wxImageList *imaglist);
+    ListboxWidgetsPage(WidgetsBookCtrl *book, wxImageList *imaglist);

 
     virtual wxControl *GetWidget() const { return m_lbox; }
 
     virtual wxControl *GetWidget() const { return m_lbox; }

+    virtual wxItemContainer* GetContainer() const { return m_lbox; }

     virtual void RecreateWidget() { CreateLbox(); }
 
     virtual void RecreateWidget() { CreateLbox(); }
 

+    // lazy creation of the content
+    virtual void CreateContent();
+

 protected:
     // event handlers
     void OnButtonReset(wxCommandEvent& event);
     void OnButtonChange(wxCommandEvent& event);
 protected:
     // event handlers
     void OnButtonReset(wxCommandEvent& event);
     void OnButtonChange(wxCommandEvent& event);

+    void OnButtonEnsureVisible(wxCommandEvent& event);

     void OnButtonDelete(wxCommandEvent& event);
     void OnButtonDeleteSel(wxCommandEvent& event);
     void OnButtonClear(wxCommandEvent& event);
     void OnButtonDelete(wxCommandEvent& event);
     void OnButtonDeleteSel(wxCommandEvent& event);
     void OnButtonClear(wxCommandEvent& event);


@@ -100,6 +109,7 @@ protected:
 
     void OnUpdateUIAddSeveral(wxUpdateUIEvent& event);
     void OnUpdateUIClearButton(wxUpdateUIEvent& event);
 
     void OnUpdateUIAddSeveral(wxUpdateUIEvent& event);
     void OnUpdateUIClearButton(wxUpdateUIEvent& event);

+    void OnUpdateUIEnsureVisibleButton(wxUpdateUIEvent& event);

     void OnUpdateUIDeleteButton(wxUpdateUIEvent& event);
     void OnUpdateUIDeleteSelButton(wxUpdateUIEvent& event);
     void OnUpdateUIResetButton(wxUpdateUIEvent& event);
     void OnUpdateUIDeleteButton(wxUpdateUIEvent& event);
     void OnUpdateUIDeleteSelButton(wxUpdateUIEvent& event);
     void OnUpdateUIResetButton(wxUpdateUIEvent& event);


@@ -110,6 +120,11 @@ protected:
     // (re)create the listbox
     void CreateLbox();
 
     // (re)create the listbox
     void CreateLbox();
 

+    // read the value of a listbox item index from the given control, return
+    // false if it's invalid
+    bool GetValidIndexFromText(const wxTextCtrl *text, int *n = NULL) const;
+
+

     // listbox parameters
     // ------------------
 
     // listbox parameters
     // ------------------
 


@@ -142,12 +157,19 @@ protected:
                *m_chkOwnerDraw;
 
     // the listbox itself and the sizer it is in
                *m_chkOwnerDraw;
 
     // the listbox itself and the sizer it is in

-    wxListBox *m_lbox;
+#ifdef __WXWINCE__
+    wxListBoxBase
+#else
+    wxListBox
+#endif
+                  *m_lbox;
+

     wxSizer *m_sizerLbox;
 
     // the text entries for "Add/change string" and "Delete" buttons
     wxTextCtrl *m_textAdd,
                *m_textChange,
     wxSizer *m_sizerLbox;
 
     // the text entries for "Add/change string" and "Delete" buttons
     wxTextCtrl *m_textAdd,
                *m_textChange,

+               *m_textEnsureVisible,

                *m_textDelete;
 
 private:
                *m_textDelete;
 
 private:


@@ -164,13 +186,16 @@ BEGIN_EVENT_TABLE(ListboxWidgetsPage, WidgetsPage)
     EVT_BUTTON(ListboxPage_Change, ListboxWidgetsPage::OnButtonChange)
     EVT_BUTTON(ListboxPage_Delete, ListboxWidgetsPage::OnButtonDelete)
     EVT_BUTTON(ListboxPage_DeleteSel, ListboxWidgetsPage::OnButtonDeleteSel)
     EVT_BUTTON(ListboxPage_Change, ListboxWidgetsPage::OnButtonChange)
     EVT_BUTTON(ListboxPage_Delete, ListboxWidgetsPage::OnButtonDelete)
     EVT_BUTTON(ListboxPage_DeleteSel, ListboxWidgetsPage::OnButtonDeleteSel)

+    EVT_BUTTON(ListboxPage_EnsureVisible, ListboxWidgetsPage::OnButtonEnsureVisible)

     EVT_BUTTON(ListboxPage_Clear, ListboxWidgetsPage::OnButtonClear)
     EVT_BUTTON(ListboxPage_Add, ListboxWidgetsPage::OnButtonAdd)
     EVT_BUTTON(ListboxPage_AddSeveral, ListboxWidgetsPage::OnButtonAddSeveral)
     EVT_BUTTON(ListboxPage_AddMany, ListboxWidgetsPage::OnButtonAddMany)
     EVT_BUTTON(ListboxPage_Clear, ListboxWidgetsPage::OnButtonClear)
     EVT_BUTTON(ListboxPage_Add, ListboxWidgetsPage::OnButtonAdd)
     EVT_BUTTON(ListboxPage_AddSeveral, ListboxWidgetsPage::OnButtonAddSeveral)
     EVT_BUTTON(ListboxPage_AddMany, ListboxWidgetsPage::OnButtonAddMany)

+    EVT_BUTTON(ListboxPage_ContainerTests, ItemContainerWidgetsPage::OnButtonTestItemContainer)

 
     EVT_TEXT_ENTER(ListboxPage_AddText, ListboxWidgetsPage::OnButtonAdd)
     EVT_TEXT_ENTER(ListboxPage_DeleteText, ListboxWidgetsPage::OnButtonDelete)
 
     EVT_TEXT_ENTER(ListboxPage_AddText, ListboxWidgetsPage::OnButtonAdd)
     EVT_TEXT_ENTER(ListboxPage_DeleteText, ListboxWidgetsPage::OnButtonDelete)

+    EVT_TEXT_ENTER(ListboxPage_EnsureVisibleText, ListboxWidgetsPage::OnButtonEnsureVisible)

 
     EVT_UPDATE_UI(ListboxPage_Reset, ListboxWidgetsPage::OnUpdateUIResetButton)
     EVT_UPDATE_UI(ListboxPage_AddSeveral, ListboxWidgetsPage::OnUpdateUIAddSeveral)
 
     EVT_UPDATE_UI(ListboxPage_Reset, ListboxWidgetsPage::OnUpdateUIResetButton)
     EVT_UPDATE_UI(ListboxPage_AddSeveral, ListboxWidgetsPage::OnUpdateUIAddSeveral)


@@ -180,6 +205,7 @@ BEGIN_EVENT_TABLE(ListboxWidgetsPage, WidgetsPage)
     EVT_UPDATE_UI(ListboxPage_Change, ListboxWidgetsPage::OnUpdateUIDeleteSelButton)
     EVT_UPDATE_UI(ListboxPage_ChangeText, ListboxWidgetsPage::OnUpdateUIDeleteSelButton)
     EVT_UPDATE_UI(ListboxPage_DeleteSel, ListboxWidgetsPage::OnUpdateUIDeleteSelButton)
     EVT_UPDATE_UI(ListboxPage_Change, ListboxWidgetsPage::OnUpdateUIDeleteSelButton)
     EVT_UPDATE_UI(ListboxPage_ChangeText, ListboxWidgetsPage::OnUpdateUIDeleteSelButton)
     EVT_UPDATE_UI(ListboxPage_DeleteSel, ListboxWidgetsPage::OnUpdateUIDeleteSelButton)

+    EVT_UPDATE_UI(ListboxPage_EnsureVisible, ListboxWidgetsPage::OnUpdateUIEnsureVisibleButton)

 
     EVT_LISTBOX(ListboxPage_Listbox, ListboxWidgetsPage::OnListbox)
     EVT_LISTBOX_DCLICK(ListboxPage_Listbox, ListboxWidgetsPage::OnListboxDClick)
 
     EVT_LISTBOX(ListboxPage_Listbox, ListboxWidgetsPage::OnListbox)
     EVT_LISTBOX_DCLICK(ListboxPage_Listbox, ListboxWidgetsPage::OnListboxDClick)


@@ -193,14 +219,20 @@ END_EVENT_TABLE()
 // implementation
 // ============================================================================
 
 // implementation
 // ============================================================================
 

-IMPLEMENT_WIDGETS_PAGE(ListboxWidgetsPage, _T("Listbox"));
+#if defined(__WXUNIVERSAL__)
+    #define FAMILY_CTRLS UNIVERSAL_CTRLS
+#else
+    #define FAMILY_CTRLS NATIVE_CTRLS
+#endif
+
+IMPLEMENT_WIDGETS_PAGE(ListboxWidgetsPage, wxT("Listbox"),
+                       FAMILY_CTRLS | WITH_ITEMS_CTRLS
+                       );

 
 

-ListboxWidgetsPage::ListboxWidgetsPage(wxBookCtrlBase *book,
+ListboxWidgetsPage::ListboxWidgetsPage(WidgetsBookCtrl *book,

                                        wxImageList *imaglist)
                                        wxImageList *imaglist)

-                  : WidgetsPage(book)
+                  : ItemContainerWidgetsPage(book, imaglist, listbox_xpm)

 {
 {

-    imaglist->Add(wxBitmap(listbox_xpm));
-

     // init everything
     m_radioSelMode = (wxRadioBox *)NULL;
 
     // init everything
     m_radioSelMode = (wxRadioBox *)NULL;
 


@@ -210,9 +242,13 @@ ListboxWidgetsPage::ListboxWidgetsPage(wxBookCtrlBase *book,
     m_chkSort =
     m_chkOwnerDraw = (wxCheckBox *)NULL;
 
     m_chkSort =
     m_chkOwnerDraw = (wxCheckBox *)NULL;
 

-    m_lbox = (wxListBox *)NULL;
+    m_lbox = NULL;

     m_sizerLbox = (wxSizer *)NULL;
 
     m_sizerLbox = (wxSizer *)NULL;
 

+}
+
+void ListboxWidgetsPage::CreateContent()
+{

     /*
        What we create here is a frame having 3 panes: style pane is the
        leftmost one, in the middle the pane with buttons allowing to perform
     /*
        What we create here is a frame having 3 panes: style pane is the
        leftmost one, in the middle the pane with buttons allowing to perform


@@ -223,17 +259,17 @@ ListboxWidgetsPage::ListboxWidgetsPage(wxBookCtrlBase *book,
 
     // left pane
     wxStaticBox *box = new wxStaticBox(this, wxID_ANY,
 
     // left pane
     wxStaticBox *box = new wxStaticBox(this, wxID_ANY,

-        _T("&Set listbox parameters"));
+        wxT("&Set listbox parameters"));

     wxSizer *sizerLeft = new wxStaticBoxSizer(box, wxVERTICAL);
 
     static const wxString modes[] =
     {
     wxSizer *sizerLeft = new wxStaticBoxSizer(box, wxVERTICAL);
 
     static const wxString modes[] =
     {

-        _T("single"),
-        _T("extended"),
-        _T("multiple"),
+        wxT("single"),
+        wxT("extended"),
+        wxT("multiple"),

     };
 
     };
 

-    m_radioSelMode = new wxRadioBox(this, wxID_ANY, _T("Selection &mode:"),
+    m_radioSelMode = new wxRadioBox(this, wxID_ANY, wxT("Selection &mode:"),

                                     wxDefaultPosition, wxDefaultSize,
                                     WXSIZEOF(modes), modes,
                                     1, wxRA_SPECIFY_COLS);
                                     wxDefaultPosition, wxDefaultSize,
                                     WXSIZEOF(modes), modes,
                                     1, wxRA_SPECIFY_COLS);


@@ -241,59 +277,69 @@ ListboxWidgetsPage::ListboxWidgetsPage(wxBookCtrlBase *book,
     m_chkVScroll = CreateCheckBoxAndAddToSizer
                    (
                     sizerLeft,
     m_chkVScroll = CreateCheckBoxAndAddToSizer
                    (
                     sizerLeft,

-                    _T("Always show &vertical scrollbar")
+                    wxT("Always show &vertical scrollbar")

                    );
     m_chkHScroll = CreateCheckBoxAndAddToSizer
                    (
                     sizerLeft,
                    );
     m_chkHScroll = CreateCheckBoxAndAddToSizer
                    (
                     sizerLeft,

-                    _T("Show &horizontal scrollbar")
+                    wxT("Show &horizontal scrollbar")

                    );
                    );

-    m_chkCheck = CreateCheckBoxAndAddToSizer(sizerLeft, _T("&Check list box"));
-    m_chkSort = CreateCheckBoxAndAddToSizer(sizerLeft, _T("&Sort items"));
-    m_chkOwnerDraw = CreateCheckBoxAndAddToSizer(sizerLeft, _T("&Owner drawn"));
+    m_chkCheck = CreateCheckBoxAndAddToSizer(sizerLeft, wxT("&Check list box"));
+    m_chkSort = CreateCheckBoxAndAddToSizer(sizerLeft, wxT("&Sort items"));
+    m_chkOwnerDraw = CreateCheckBoxAndAddToSizer(sizerLeft, wxT("&Owner drawn"));

 
     sizerLeft->Add(5, 5, 0, wxGROW | wxALL, 5); // spacer
     sizerLeft->Add(m_radioSelMode, 0, wxGROW | wxALL, 5);
 
 
     sizerLeft->Add(5, 5, 0, wxGROW | wxALL, 5); // spacer
     sizerLeft->Add(m_radioSelMode, 0, wxGROW | wxALL, 5);
 

-    wxButton *btn = new wxButton(this, ListboxPage_Reset, _T("&Reset"));
+    wxButton *btn = new wxButton(this, ListboxPage_Reset, wxT("&Reset"));

     sizerLeft->Add(btn, 0, wxALIGN_CENTRE_HORIZONTAL | wxALL, 15);
 
     // middle pane
     wxStaticBox *box2 = new wxStaticBox(this, wxID_ANY,
     sizerLeft->Add(btn, 0, wxALIGN_CENTRE_HORIZONTAL | wxALL, 15);
 
     // middle pane
     wxStaticBox *box2 = new wxStaticBox(this, wxID_ANY,

-        _T("&Change listbox contents"));
+        wxT("&Change listbox contents"));

     wxSizer *sizerMiddle = new wxStaticBoxSizer(box2, wxVERTICAL);
 
     wxSizer *sizerRow = new wxBoxSizer(wxHORIZONTAL);
     wxSizer *sizerMiddle = new wxStaticBoxSizer(box2, wxVERTICAL);
 
     wxSizer *sizerRow = new wxBoxSizer(wxHORIZONTAL);

-    btn = new wxButton(this, ListboxPage_Add, _T("&Add this string"));
-    m_textAdd = new wxTextCtrl(this, ListboxPage_AddText, _T("test item 0"));
+    btn = new wxButton(this, ListboxPage_Add, wxT("&Add this string"));
+    m_textAdd = new wxTextCtrl(this, ListboxPage_AddText, wxT("test item 0"));

     sizerRow->Add(btn, 0, wxRIGHT, 5);
     sizerRow->Add(m_textAdd, 1, wxLEFT, 5);
     sizerMiddle->Add(sizerRow, 0, wxALL | wxGROW, 5);
 
     sizerRow->Add(btn, 0, wxRIGHT, 5);
     sizerRow->Add(m_textAdd, 1, wxLEFT, 5);
     sizerMiddle->Add(sizerRow, 0, wxALL | wxGROW, 5);
 

-    btn = new wxButton(this, ListboxPage_AddSeveral, _T("&Insert a few strings"));
+    btn = new wxButton(this, ListboxPage_AddSeveral, wxT("&Insert a few strings"));

     sizerMiddle->Add(btn, 0, wxALL | wxGROW, 5);
 
     sizerMiddle->Add(btn, 0, wxALL | wxGROW, 5);
 

-    btn = new wxButton(this, ListboxPage_AddMany, _T("Add &many strings"));
+    btn = new wxButton(this, ListboxPage_AddMany, wxT("Add &many strings"));

     sizerMiddle->Add(btn, 0, wxALL | wxGROW, 5);
 
     sizerRow = new wxBoxSizer(wxHORIZONTAL);
     sizerMiddle->Add(btn, 0, wxALL | wxGROW, 5);
 
     sizerRow = new wxBoxSizer(wxHORIZONTAL);

-    btn = new wxButton(this, ListboxPage_Change, _T("C&hange current"));
+    btn = new wxButton(this, ListboxPage_Change, wxT("C&hange current"));

     m_textChange = new wxTextCtrl(this, ListboxPage_ChangeText, wxEmptyString);
     sizerRow->Add(btn, 0, wxRIGHT, 5);
     sizerRow->Add(m_textChange, 1, wxLEFT, 5);
     sizerMiddle->Add(sizerRow, 0, wxALL | wxGROW, 5);
 
     sizerRow = new wxBoxSizer(wxHORIZONTAL);
     m_textChange = new wxTextCtrl(this, ListboxPage_ChangeText, wxEmptyString);
     sizerRow->Add(btn, 0, wxRIGHT, 5);
     sizerRow->Add(m_textChange, 1, wxLEFT, 5);
     sizerMiddle->Add(sizerRow, 0, wxALL | wxGROW, 5);
 
     sizerRow = new wxBoxSizer(wxHORIZONTAL);

-    btn = new wxButton(this, ListboxPage_Delete, _T("&Delete this item"));
+    btn = new wxButton(this, ListboxPage_EnsureVisible, wxT("Make item &visible"));
+    m_textEnsureVisible = new wxTextCtrl(this, ListboxPage_EnsureVisibleText, wxEmptyString);
+    sizerRow->Add(btn, 0, wxRIGHT, 5);
+    sizerRow->Add(m_textEnsureVisible, 1, wxLEFT, 5);
+    sizerMiddle->Add(sizerRow, 0, wxALL | wxGROW, 5);
+
+    sizerRow = new wxBoxSizer(wxHORIZONTAL);
+    btn = new wxButton(this, ListboxPage_Delete, wxT("&Delete this item"));

     m_textDelete = new wxTextCtrl(this, ListboxPage_DeleteText, wxEmptyString);
     sizerRow->Add(btn, 0, wxRIGHT, 5);
     sizerRow->Add(m_textDelete, 1, wxLEFT, 5);
     sizerMiddle->Add(sizerRow, 0, wxALL | wxGROW, 5);
 
     m_textDelete = new wxTextCtrl(this, ListboxPage_DeleteText, wxEmptyString);
     sizerRow->Add(btn, 0, wxRIGHT, 5);
     sizerRow->Add(m_textDelete, 1, wxLEFT, 5);
     sizerMiddle->Add(sizerRow, 0, wxALL | wxGROW, 5);
 

-    btn = new wxButton(this, ListboxPage_DeleteSel, _T("Delete &selection"));
+    btn = new wxButton(this, ListboxPage_DeleteSel, wxT("Delete &selection"));

     sizerMiddle->Add(btn, 0, wxALL | wxGROW, 5);
 
     sizerMiddle->Add(btn, 0, wxALL | wxGROW, 5);
 

-    btn = new wxButton(this, ListboxPage_Clear, _T("&Clear"));
+    btn = new wxButton(this, ListboxPage_Clear, wxT("&Clear"));
+    sizerMiddle->Add(btn, 0, wxALL | wxGROW, 5);
+
+    btn = new wxButton(this, ListboxPage_ContainerTests, wxT("Run &tests"));

     sizerMiddle->Add(btn, 0, wxALL | wxGROW, 5);
 
     // right pane
     sizerMiddle->Add(btn, 0, wxALL | wxGROW, 5);
 
     // right pane


@@ -315,8 +361,6 @@ ListboxWidgetsPage::ListboxWidgetsPage(wxBookCtrlBase *book,
     Reset();
 
     SetSizer(sizerTop);
     Reset();
 
     SetSizer(sizerTop);

-
-    sizerTop->Fit(this);

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -339,7 +383,7 @@ void ListboxWidgetsPage::CreateLbox()
     switch ( m_radioSelMode->GetSelection() )
     {
         default:
     switch ( m_radioSelMode->GetSelection() )
     {
         default:

-            wxFAIL_MSG( _T("unexpected radio box selection") );
+            wxFAIL_MSG( wxT("unexpected radio box selection") );

 
         case LboxSel_Single:    flags |= wxLB_SINGLE; break;
         case LboxSel_Extended:  flags |= wxLB_EXTENDED; break;
 
         case LboxSel_Single:    flags |= wxLB_SINGLE; break;
         case LboxSel_Extended:  flags |= wxLB_EXTENDED; break;


@@ -390,6 +434,33 @@ void ListboxWidgetsPage::CreateLbox()
     m_sizerLbox->Layout();
 }
 
     m_sizerLbox->Layout();
 }
 

+// ----------------------------------------------------------------------------
+// miscellaneous helpers
+// ----------------------------------------------------------------------------
+
+bool
+ListboxWidgetsPage::GetValidIndexFromText(const wxTextCtrl *text, int *n) const
+{
+    unsigned long idx;
+    if ( !text->GetValue().ToULong(&idx) || (idx >= m_lbox->GetCount()) )
+    {
+        // don't give the warning if we're just testing but do give it if we
+        // want to retrieve the value as this is only done in answer to a user
+        // action
+        if ( n )
+        {
+            wxLogWarning("Invalid index \"%s\"", text->GetValue());
+        }
+
+        return false;
+    }
+
+    if ( n )
+        *n = idx;
+
+    return true;
+}
+

 // ----------------------------------------------------------------------------
 // event handlers
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // event handlers
 // ----------------------------------------------------------------------------


@@ -412,11 +483,21 @@ void ListboxWidgetsPage::OnButtonChange(wxCommandEvent& WXUNUSED(event))
     }
 }
 
     }
 }
 

+void ListboxWidgetsPage::OnButtonEnsureVisible(wxCommandEvent& WXUNUSED(event))
+{
+    int n;
+    if ( !GetValidIndexFromText(m_textEnsureVisible, &n) )
+    {
+        return;
+    }
+
+    m_lbox->EnsureVisible(n);
+}
+

 void ListboxWidgetsPage::OnButtonDelete(wxCommandEvent& WXUNUSED(event))
 {
 void ListboxWidgetsPage::OnButtonDelete(wxCommandEvent& WXUNUSED(event))
 {

-    unsigned long n;
-    if ( !m_textDelete->GetValue().ToULong(&n) ||
-            (n >= (unsigned)m_lbox->GetCount()) )
+    int n;
+    if ( !GetValidIndexFromText(m_textDelete, &n) )

     {
         return;
     }
     {
         return;
     }


@@ -447,7 +528,7 @@ void ListboxWidgetsPage::OnButtonAdd(wxCommandEvent& WXUNUSED(event))
     if ( !m_textAdd->IsModified() )
     {
         // update the default string
     if ( !m_textAdd->IsModified() )
     {
         // update the default string

-        m_textAdd->SetValue(wxString::Format(_T("test item %u"), ++s_item));
+        m_textAdd->SetValue(wxString::Format(wxT("test item %u"), ++s_item));

     }
 
     m_lbox->Append(s);
     }
 
     m_lbox->Append(s);


@@ -458,16 +539,16 @@ void ListboxWidgetsPage::OnButtonAddMany(wxCommandEvent& WXUNUSED(event))
     // "many" means 1000 here
     for ( unsigned int n = 0; n < 1000; n++ )
     {
     // "many" means 1000 here
     for ( unsigned int n = 0; n < 1000; n++ )
     {

-        m_lbox->Append(wxString::Format(_T("item #%u"), n));
+        m_lbox->Append(wxString::Format(wxT("item #%u"), n));

     }
 }
 
 void ListboxWidgetsPage::OnButtonAddSeveral(wxCommandEvent& WXUNUSED(event))
 {
     wxArrayString items;
     }
 }
 
 void ListboxWidgetsPage::OnButtonAddSeveral(wxCommandEvent& WXUNUSED(event))
 {
     wxArrayString items;

-    items.Add(_T("First"));
-    items.Add(_T("another one"));
-    items.Add(_T("and the last (very very very very very very very very very very long) one"));
+    items.Add(wxT("First"));
+    items.Add(wxT("another one"));
+    items.Add(wxT("and the last (very very very very very very very very very very long) one"));

     m_lbox->InsertItems(items, 0);
 }
 
     m_lbox->InsertItems(items, 0);
 }
 


@@ -480,11 +561,14 @@ void ListboxWidgetsPage::OnUpdateUIResetButton(wxUpdateUIEvent& event)
                   m_chkVScroll->GetValue() );
 }
 
                   m_chkVScroll->GetValue() );
 }
 

+void ListboxWidgetsPage::OnUpdateUIEnsureVisibleButton(wxUpdateUIEvent& event)
+{
+    event.Enable(GetValidIndexFromText(m_textEnsureVisible));
+}
+

 void ListboxWidgetsPage::OnUpdateUIDeleteButton(wxUpdateUIEvent& event)
 {
 void ListboxWidgetsPage::OnUpdateUIDeleteButton(wxUpdateUIEvent& event)
 {

-    unsigned long n;
-    event.Enable(m_textDelete->GetValue().ToULong(&n) &&
-                    (n < (unsigned)m_lbox->GetCount()));
+    event.Enable(GetValidIndexFromText(m_textDelete));

 }
 
 void ListboxWidgetsPage::OnUpdateUIDeleteSelButton(wxUpdateUIEvent& event)
 }
 
 void ListboxWidgetsPage::OnUpdateUIDeleteSelButton(wxUpdateUIEvent& event)


@@ -506,22 +590,26 @@ void ListboxWidgetsPage::OnUpdateUIAddSeveral(wxUpdateUIEvent& event)
 void ListboxWidgetsPage::OnListbox(wxCommandEvent& event)
 {
     long sel = event.GetSelection();
 void ListboxWidgetsPage::OnListbox(wxCommandEvent& event)
 {
     long sel = event.GetSelection();

-    m_textDelete->SetValue(wxString::Format(_T("%ld"), sel));
+    m_textDelete->SetValue(wxString::Format(wxT("%ld"), sel));

 
     if (event.IsSelection())
 
     if (event.IsSelection())

-        wxLogMessage(_T("Listbox item %ld selected"), sel);
+    {
+        wxLogMessage(wxT("Listbox item %ld selected"), sel);
+    }

     else
     else

-        wxLogMessage(_T("Listbox item %ld deselected"), sel);
+    {
+        wxLogMessage(wxT("Listbox item %ld deselected"), sel);
+    }

 }
 
 void ListboxWidgetsPage::OnListboxDClick(wxCommandEvent& event)
 {
 }
 
 void ListboxWidgetsPage::OnListboxDClick(wxCommandEvent& event)
 {

-    wxLogMessage( _T("Listbox item %d double clicked"), event.GetInt() );
+    wxLogMessage( wxT("Listbox item %d double clicked"), event.GetInt() );

 }
 
 void ListboxWidgetsPage::OnCheckListbox(wxCommandEvent& event)
 {
 }
 
 void ListboxWidgetsPage::OnCheckListbox(wxCommandEvent& event)
 {

-    wxLogMessage( _T("Listbox item %d toggled"), event.GetInt() );
+    wxLogMessage( wxT("Listbox item %d toggled"), event.GetInt() );

 }
 
 void ListboxWidgetsPage::OnCheckOrRadioBox(wxCommandEvent& WXUNUSED(event))
 }
 
 void ListboxWidgetsPage::OnCheckOrRadioBox(wxCommandEvent& WXUNUSED(event))