1. added wxTreeCtrl::DeleteChildren()

2. wxTreeCtrl::CollapseAndReset() doesn't destroy the item itself any more
3. wxTreeCtrl::Delete() sends wxEVT_COMMAND_TREE_CHILDREN event (but
   DeleteChildren() and DeleteAll() do not!)
4. Sample modified to show the new function too
5. Micro redraw bug fixed (small vertical line was sometimes drawn when it
   shouldn't have been)


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1224 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/treectrl.h

@@ -370,7 +370,11 @@ public:
 
         // delete this item and associated data if any
     void Delete(const wxTreeItemId& item);
+        // delete all children (but don't delete the item itself)
+        // NB: this won't send wxEVT_COMMAND_TREE_ITEM_DELETED events
+    void DeleteChildren(const wxTreeItemId& item);
         // delete all items from the tree
+        // NB: this won't send wxEVT_COMMAND_TREE_ITEM_DELETED events
     void DeleteAllItems();
 
         // expand this item

include/wx/msw/treectrl.h

@@ -338,7 +338,11 @@ public:
 
         // delete this item and associated data if any
     void Delete(const wxTreeItemId& item);
+        // delete all children (but don't delete the item itself)
+        // NB: this won't send wxEVT_COMMAND_TREE_ITEM_DELETED events
+    void DeleteChildren(const wxTreeItemId& item);
         // delete all items from the tree
+        // NB: this won't send wxEVT_COMMAND_TREE_ITEM_DELETED events
     void DeleteAllItems();
 
         // expand this item

samples/treectrl/treetest.cpp

@@ -46,6 +46,7 @@ BEGIN_EVENT_TABLE(MyFrame, wxFrame)
   EVT_MENU(TreeTest_Bold, MyFrame::OnSetBold)
   EVT_MENU(TreeTest_UnBold, MyFrame::OnClearBold)
   EVT_MENU(TreeTest_Delete, MyFrame::OnDelete)
+  EVT_MENU(TreeTest_DeleteChildren, MyFrame::OnDeleteChildren)
   EVT_MENU(TreeTest_DeleteAll, MyFrame::OnDeleteAll)
   EVT_MENU(TreeTest_Recreate, MyFrame::OnRecreate)
 END_EVENT_TABLE()
@@ -100,10 +101,12 @@ MyFrame::MyFrame(const wxString& title, int x, int y, int w, int h)
   wxMenu *file_menu = new wxMenu;
 
   file_menu->Append(TreeTest_Dump, "D&ump tree items");
-  file_menu->Append(TreeTest_Delete, "&Delete this item");
-  file_menu->Append(TreeTest_DeleteAll, "Delete &all items");
   file_menu->Append(TreeTest_Recreate, "&Recreate the tree");
   file_menu->AppendSeparator();
+  file_menu->Append(TreeTest_Delete, "&Delete this item");
+  file_menu->Append(TreeTest_DeleteChildren, "Delete &children");
+  file_menu->Append(TreeTest_DeleteAll, "Delete &all items");
+  file_menu->AppendSeparator();
   file_menu->Append(TreeTest_Bold, "Make item &bold");
   file_menu->Append(TreeTest_UnBold, "Make item &not bold");
   file_menu->AppendSeparator();
@@ -190,6 +193,12 @@ void MyFrame::OnDelete(wxCommandEvent& WXUNUSED(event))
   m_treeCtrl->Delete(item);
 }
 
+void MyFrame::OnDeleteChildren(wxCommandEvent& WXUNUSED(event))
+{
+  wxTreeItemId item = m_treeCtrl->GetSelection();
+  m_treeCtrl->DeleteChildren(item);
+}
+
 void MyFrame::OnDeleteAll(wxCommandEvent& WXUNUSED(event))
 {
   m_treeCtrl->DeleteAllItems();

samples/treectrl/treetest.h

@@ -86,6 +86,7 @@ public:
   void OnAbout(wxCommandEvent& event);
   void OnDump(wxCommandEvent& event);
   void OnDelete(wxCommandEvent& event);
+  void OnDeleteChildren(wxCommandEvent& event);
   void OnDeleteAll(wxCommandEvent& event);
   void OnRecreate(wxCommandEvent& event);
 
@@ -109,6 +110,7 @@ enum
   TreeTest_Bold,
   TreeTest_UnBold,
   TreeTest_Delete,
+  TreeTest_DeleteChildren,
   TreeTest_DeleteAll,
   TreeTest_Recreate,
   TreeTest_Ctrl = 100

src/generic/treectrl.cpp

@@ -81,6 +81,7 @@ public:
   wxGenericTreeItem *GetParent() const { return m_parent; }
 
   // operations
+  void DeleteChildren();
   void Reset();
 
   // get count of all children (and grand children if 'recursively')
@@ -182,9 +183,16 @@ wxGenericTreeItem::~wxGenericTreeItem()
 {
   delete m_data;
 
+  DeleteChildren();
+}
+
+void wxGenericTreeItem::DeleteChildren()
+{
   size_t count = m_children.Count();
   for ( size_t n = 0; n < count; n++ )
     delete m_children[n];
+
+  m_children.Empty();
 }
 
 void wxGenericTreeItem::SetText( const wxString &text, wxDC& dc )
@@ -207,7 +215,7 @@ void wxGenericTreeItem::Reset()
 
   m_level = 0;
 
-  m_children.Empty();
+  DeleteChildren();
   m_isCollapsed = TRUE;
 
   m_parent = (wxGenericTreeItem *)NULL;
@@ -690,11 +698,25 @@ wxTreeItemId wxTreeCtrl::AppendItem(const wxTreeItemId& parentId,
                       image, selImage, data);
 }
 
+void wxTreeCtrl::DeleteChildren(const wxTreeItemId& itemId)
+{
+    wxGenericTreeItem *item = itemId.m_pItem;
+    item->DeleteChildren();
+
+    m_dirty = TRUE;
+}
+
 void wxTreeCtrl::Delete(const wxTreeItemId& itemId)
 {
   wxGenericTreeItem *item = itemId.m_pItem;
   wxGenericTreeItem *parent = item->GetParent();
 
+  // notify the parent...
+  wxTreeEvent event( wxEVT_COMMAND_TREE_DELETE_ITEM, GetId() );
+  event.m_item = item;
+  event.SetEventObject( this );
+  ProcessEvent( event );
+
   if ( parent )
   {
     parent->GetChildren().Remove(item);
@@ -779,7 +801,7 @@ void wxTreeCtrl::Collapse(const wxTreeItemId& itemId)
 void wxTreeCtrl::CollapseAndReset(const wxTreeItemId& item)
 {
   Collapse(item);
-  Delete(item);
+  DeleteChildren(item);
 }
 
 void wxTreeCtrl::Toggle(const wxTreeItemId& itemId)
@@ -1061,22 +1083,26 @@ void wxTreeCtrl::PaintLevel( wxGenericTreeItem *item, wxDC &dc, int level, int &
     }
   }
 
-  if ( !item->IsExpanded() )
-    return;
-
-  int semiOldY = y;
-
-  wxArrayTreeItems& children = item->GetChildren();
-  size_t count = children.Count();
-  for ( size_t n = 0; n < count; n++ )
+  if ( item->IsExpanded() )
   {
-    y += m_lineHeight;
-    semiOldY = y;
+      int semiOldY = y;
 
-    PaintLevel( children[n], dc, level+1, y );
+      wxArrayTreeItems& children = item->GetChildren();
+      size_t count = children.Count();
+      for ( size_t n = 0; n < count; n++ )
+      {
+        y += m_lineHeight;
+        semiOldY = y;
+
+        PaintLevel( children[n], dc, level+1, y );
+      }
+
+      // it may happen that the item is expanded but has no items (when you
+      // delete all its children for example) - don't draw the vertical line
+      // in this case
+      if ( count > 0 )
+          dc.DrawLine( horizX+15, oldY+5, horizX+15, semiOldY );
   }
-
-  dc.DrawLine( horizX+15, oldY+5, horizX+15, semiOldY );
 }
 
 // -----------------------------------------------------------------------------