Add wxDataViewListCtrl::{Set,Get}ItemData() methods.

These methods are convenient when migrating the code that previously used
wxListCtrl to wxDataViewCtrl.

Closes #11088.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71562 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/dataview.h

@@ -2337,6 +2337,15 @@ public:
     */
     void DeleteAllItems();
 
+    /**
+        Returns the client data associated with the item.
+
+        @see SetItemData()
+
+        @since 2.9.4
+    */
+    wxUIntPtr GetItemData(const wxDataViewItem& item) const;
+
     /**
          Sets the value in the store and update the control.
     */
@@ -2379,6 +2388,19 @@ public:
     */
     bool GetToggleValue( unsigned int row, unsigned int col ) const;
 
+    /**
+        Associates a client data pointer with the given item.
+
+        Notice that the control does @e not take ownership of the pointer for
+        compatibility with wxListCtrl. I.e. it will @e not delete the pointer
+        (if it is a pointer and not a number) itself, it is up to you to do it.
+
+        @see GetItemData()
+
+        @since 2.9.4
+    */
+    void SetItemData(const wxDataViewItem& item, wxUIntPtr data);
+
     //@}
 };
 
@@ -2688,6 +2710,15 @@ public:
     */
     void DeleteAllItems();
 
+    /**
+        Returns the client data associated with the item.
+
+        @see SetItemData()
+
+        @since 2.9.4
+    */
+    wxUIntPtr GetItemData(const wxDataViewItem& item) const;
+
     /**
         Overridden from wxDataViewModel
     */
@@ -2698,6 +2729,18 @@ public:
     */
     virtual wxString GetColumnType( unsigned int col ) const;
 
+    /**
+        Sets the client data associated with the item.
+
+        Notice that this class does @e not take ownership of the passed in
+        pointer and will not delete it.
+
+        @see GetItemData()
+
+        @since 2.9.4
+    */
+    void SetItemData(const wxDataViewItem& item, wxUIntPtr data);
+
     /**
         Overridden from wxDataViewIndexListModel
     */