Create model and column in wxDataViewTreeCtrl::Create(), not ctor.

Old code created the tree model and its unique built-in column only in
wxDataViewTreeCtrl ctor but not in Create(), meaning that the behaviour was
very different depending on whether you used base class ctor call or Create()
in a derived class. This was confusing and completely inconsistent with wx API
in which using the default ctor and Create() is supposed to always have
exactly the same effect as using non-default ctor so change this to create the
model in Create() so that it's always done.

Slightly update the documentation and also add wxDataViewTreeCtrl::Init() for
consistency.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62498 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/dataview.h

@@ -71,7 +71,7 @@
         wxDataViewModel *musicModel = new MyMusicModel;
         m_musicCtrl->AssociateModel( musicModel );
         musicModel->DecRef();  // avoid memory leak !!
-        
+
         // add columns now
     @endcode
 
@@ -1611,11 +1611,11 @@ public:
        data.push_back( wxVariant("row 3") );
        listctrl->AppendItem( data );
     @endcode
-    
+
     @beginStyleTable
     See wxDataViewCtrl for the list of supported styles.
     @endStyleTable
-    
+
     @beginEventEmissionTable
     See wxDataViewCtrl for the list of events emitted by this class.
     @endEventTable
@@ -1664,7 +1664,7 @@ public:
         @name Column management functions
     */
     //@{
-   
+
     /**
         Appends a column to the control and additionally appends a
         column to the store with the type string.
@@ -1679,24 +1679,24 @@ public:
 
     /**
         Appends a text column to the control and the store.
-        
+
         See wxDataViewColumn::wxDataViewColumn for more info about
         the parameters.
     */
     wxDataViewColumn *AppendTextColumn( const wxString &label,
           wxDataViewCellMode mode = wxDATAVIEW_CELL_INERT,
-          int width = -1, wxAlignment align = wxALIGN_LEFT, 
+          int width = -1, wxAlignment align = wxALIGN_LEFT,
           int flags = wxDATAVIEW_COL_RESIZABLE );
 
     /**
         Appends a toggle column to the control and the store.
-        
+
         See wxDataViewColumn::wxDataViewColumn for more info about
         the parameters.
     */
     wxDataViewColumn *AppendToggleColumn( const wxString &label,
           wxDataViewCellMode mode = wxDATAVIEW_CELL_ACTIVATABLE,
-          int width = -1, wxAlignment align = wxALIGN_LEFT, 
+          int width = -1, wxAlignment align = wxALIGN_LEFT,
           int flags = wxDATAVIEW_COL_RESIZABLE );
 
     /**
@@ -1707,7 +1707,7 @@ public:
     */
     wxDataViewColumn *AppendProgressColumn( const wxString &label,
           wxDataViewCellMode mode = wxDATAVIEW_CELL_INERT,
-          int width = -1, wxAlignment align = wxALIGN_LEFT, 
+          int width = -1, wxAlignment align = wxALIGN_LEFT,
           int flags = wxDATAVIEW_COL_RESIZABLE );
 
     /**
@@ -1718,7 +1718,7 @@ public:
     */
     wxDataViewColumn *AppendIconTextColumn( const wxString &label,
           wxDataViewCellMode mode = wxDATAVIEW_CELL_INERT,
-          int width = -1, wxAlignment align = wxALIGN_LEFT, 
+          int width = -1, wxAlignment align = wxALIGN_LEFT,
           int flags = wxDATAVIEW_COL_RESIZABLE );
 
     /**
@@ -1731,7 +1731,7 @@ public:
         Inserts a column to the control and additionally inserts a
         column to the list store with the type @a varianttype.
     */
-    void InsertColumn( unsigned int pos, wxDataViewColumn *column, 
+    void InsertColumn( unsigned int pos, wxDataViewColumn *column,
                        const wxString &varianttype );
 
     /**
@@ -1747,13 +1747,13 @@ public:
     void PrependColumn( wxDataViewColumn *column, const wxString &varianttype );
 
     //@}
-    
-    
+
+
     /**
         @name Item management functions
     */
     //@{
-    
+
     /**
         Appends an item (=row) to the control and store.
     */
@@ -1820,7 +1820,7 @@ public:
          respective column.
     */
     bool GetToggleValue( unsigned int row, unsigned int col ) const;
-    
+
     //@}
 };
 
@@ -1832,13 +1832,13 @@ public:
     and forwards most of its API to that class.
     Additionally, it uses a wxImageList to store a list of icons.
 
-    The main purpose of this class is to represent a possible replacement for
-    wxTreeCtrl.
+    The main purpose of this class is to provide a simple upgrade path for code
+    using wxTreeCtrl.
 
     @beginStyleTable
     See wxDataViewCtrl for the list of supported styles.
     @endStyleTable
-    
+
     @beginEventEmissionTable
     See wxDataViewCtrl for the list of events emitted by this class.
     @endEventTable
@@ -1856,12 +1856,14 @@ public:
     wxDataViewTreeCtrl();
 
     /**
-        Constructor. Calls Create().
+        Constructor.
+
+        Calls Create().
     */
     wxDataViewTreeCtrl(wxWindow* parent, wxWindowID id,
                        const wxPoint& pos = wxDefaultPosition,
                        const wxSize& size = wxDefaultSize,
-                       long style = wxDV_NO_HEADER,
+                       long style = wxDV_NO_HEADER | wxDV_ROW_LINES,
                        const wxValidator& validator = wxDefaultValidator);
 
     /**
@@ -1888,11 +1890,14 @@ public:
 
     /**
         Creates the control and a wxDataViewTreeStore as its internal model.
+
+        The default tree column created by this method is an editable column
+        using wxDataViewIconTextRenderer as its renderer.
     */
     bool Create(wxWindow* parent, wxWindowID id,
                 const wxPoint& pos = wxDefaultPosition,
                 const wxSize& size = wxDefaultSize,
-                long style = wxDV_NO_HEADER,
+                long style = wxDV_NO_HEADER | wxDV_ROW_LINES,
                 const wxValidator& validator = wxDefaultValidator);
 
     /**
@@ -2375,7 +2380,7 @@ public:
     @event{EVT_DATAVIEW_CACHE_HINT(id, func)}
            Process a @c wxEVT_COMMAND_DATAVIEW_CACHE_HINT event.
     @endEventTable
-    
+
     @library{wxadv}
     @category{events,dvc}
 */