TdxTreeViewNodes Class

A tree node container in the Tree View.

Declaration

delphi

TdxTreeViewNodes = class(
    TdxTreeViewPersistent
)

Remarks

The class members allow you to do the following:

Add nodes to the container (Add, AddFirst, AddObject, AddObjectFirst, AddChild, AddChildFirst, AddChildObject, AddChildObjectFirst, AddNode, Insert, InsertObject, and InsertNode).
Delete nodes (Delete and Clear).
Count nodes (Count).
Access tree nodes (Item and GetFirstNode).
Sort nodes (AlphaSort and CustomSort).
Manage Tree View updates (BeginUpdate and EndUpdate).
Access a handle to the node container (Handle).

The Tree View’s Items property references a TdxTreeViewNodes object.

Refer to the following topic for information on how to use a tree node container: Tree View Control.

Example

The following code checks all nodes in the Tree View control that have child nodes:

Delphi
Delphi (Alternative)
C++
C++ (Alternative)

delphi

var
  ANode: TdxTreeViewNode;
begin
  dxTreeViewControl1.BeginUpdate;
  for ANode in dxTreeViewControl1.Items do
    ANode.Checked := ANode.Count > 0;
  dxTreeViewControl1.EndUpdate;
end;

delphi

var
  I: Integer;
  ANode: TdxTreeViewNode;
begin
  dxTreeViewControl1.BeginUpdate;
  for I := 0 to dxTreeViewControl1.Items.Count - 1 do
    begin
      ANode := dxTreeViewControl1.Items[I];
      ANode.Checked := ANode.Count > 0;
    end;
  dxTreeViewControl1.EndUpdate;
end;

cpp

dxTreeViewControl1->BeginUpdate(); 
for (TdxTreeViewNode *ANode : dxTreeViewControl1->Items)
  ANode->Checked = ANode->Count > 0;
dxTreeViewControl1->EndUpdate();

cpp

TdxTreeViewNode *ANode;
dxTreeViewControl1->BeginUpdate();
for (int I = 0; I < dxTreeViewControl1->Items->Count; I++)
{
  ANode = dxTreeViewControl1->Items->Item[I];
  ANode->Checked = ANode->Count > 0;
}
dxTreeViewControl1->EndUpdate();

Note

A Tree View control shows node checkboxes if the control’s OptionsView.ShowCheckBoxes property is set to True.

Inheritance

TObject TPersistent TdxTreeViewPersistent TdxTreeViewNodes