Implement and document wxDataViewTreeCtrl::IsContainer(), use it in the sample to not add items to non-containers

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62630 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/dataview.h

@@ -1212,6 +1212,9 @@ public:
     const wxDataViewTreeStore *GetStore() const
         { return (const wxDataViewTreeStore*) GetModel(); }
 
+    bool IsContainer( const wxDataViewItem& item ) const
+        { return GetStore()->IsContainer(item); }
+
     void SetImageList( wxImageList *imagelist );
     wxImageList* GetImageList() { return m_imageList; }
 

interface/wx/dataview.h

@@ -2023,6 +2023,11 @@ public:
                               int icon = -1,
                               wxClientData* data = NULL);
 
+    /**
+        Returns true if item is a container.
+    */
+    bool IsContainer( const wxDataViewItem& item );
+    
     /**
         Calls the same method from wxDataViewTreeStore but uses
         an index position in the image list instead of a wxIcon.

samples/dataview/dataview.cpp

@@ -1092,6 +1092,7 @@ void MyFrame::OnAddTreeItem(wxCommandEvent& WXUNUSED(event))
 {
     wxDataViewTreeCtrl* ctrl = (wxDataViewTreeCtrl*) m_ctrl[3];
     wxDataViewItem selected = ctrl->GetSelection();
+    if (ctrl->IsContainer(selected))
         ctrl->AppendItem( selected, "Item", 0 );
 }
 
@@ -1099,6 +1100,7 @@ void MyFrame::OnAddTreeContainerItem(wxCommandEvent& WXUNUSED(event))
 {
     wxDataViewTreeCtrl* ctrl = (wxDataViewTreeCtrl*) m_ctrl[3];
     wxDataViewItem selected = ctrl->GetSelection();
+    if (ctrl->IsContainer(selected))
         ctrl->AppendContainer(selected, "Container", 0 );
 }
 

src/common/datavcmn.cpp

@@ -1790,6 +1790,14 @@ wxDataViewTreeStore::InsertContainer(const wxDataViewItem& parent,
     return node->GetItem();
 }
 
+bool wxDataViewTreeStore::IsContainer( const wxDataViewItem& item ) const
+{
+    wxDataViewTreeStoreNode *node = FindNode( item );
+    if (!node) return false;
+
+    return node->IsContainer();
+}
+
 wxDataViewItem wxDataViewTreeStore::GetNthChild( const wxDataViewItem& parent, unsigned int pos ) const
 {
     wxDataViewTreeStoreContainerNode *parent_node = FindContainerNode( parent );
@@ -1963,14 +1971,6 @@ wxDataViewItem wxDataViewTreeStore::GetParent( const wxDataViewItem &item ) cons
     return parent->GetItem();
 }
 
-bool wxDataViewTreeStore::IsContainer( const wxDataViewItem &item ) const
-{
-    wxDataViewTreeStoreNode *node = FindNode( item );
-    if (!node) return false;
-
-    return node->IsContainer();
-}
-
 unsigned int wxDataViewTreeStore::GetChildren( const wxDataViewItem &item, wxDataViewItemArray &children ) const
 {
     wxDataViewTreeStoreContainerNode *node = FindContainerNode( item );