Show new wxTextCtrl value in the widgets sample

This is useful for quickly checking that we're getting expected events
when modifying the control and/or not getting any unexpected ones and
was already done on wxComboBox page, but not for wxTextCtrl.

samples/widgets/textctrl.cpp

@@ -31,6 +31,7 @@
     #include "wx/bitmap.h"
     #include "wx/button.h"
     #include "wx/checkbox.h"
+    #include "wx/dcclient.h"
     #include "wx/radiobox.h"
     #include "wx/statbox.h"
     #include "wx/stattext.h"
@@ -986,7 +987,7 @@ void TextWidgetsPage::OnUpdateUIResetButton(wxUpdateUIEvent& event)
                   (m_radioWrap->GetSelection() != DEFAULTS.wrapStyle) );
 }
 
-void TextWidgetsPage::OnText(wxCommandEvent& WXUNUSED(event))
+void TextWidgetsPage::OnText(wxCommandEvent& event)
 {
     // small hack to suppress the very first message: by then the logging is
     // not yet redirected and so initial setting of the text value results in
@@ -998,7 +999,16 @@ void TextWidgetsPage::OnText(wxCommandEvent& WXUNUSED(event))
         return;
     }
 
-    wxLogMessage("Text ctrl value changed");
+    // Replace middle of long text with ellipsis just to avoid filling up the
+    // log control with too much unnecessary stuff.
+    wxLogMessage("Text control value changed (now '%s')",
+                 wxControl::Ellipsize
+                 (
+                    event.GetString(),
+                    wxClientDC(this),
+                    wxELLIPSIZE_MIDDLE,
+                    GetTextExtent('W').x*100
+                 ));
 }
 
 void TextWidgetsPage::OnTextEnter(wxCommandEvent& event)