Was trying the same way as for the good old VCL TTreeNode. Ok, there is no TTreeNode and there is no method to add treenodes to the tree, instead i have to manually create TTreeViewItem instances and set it’s parent property to a TTreeView instance. Now, TTreeViewItem has a data property but it’s type is TValue.
How to handle this type?
I tried the following:
type
TMaster = class(TDevice)
…
end;
…
mstitem := TTreeViewItem.create(self);
mstitem.parent := TreeView1;
mstitem.data := TMaster.Create(i, ‘master’+ inttostr(i));
…
procedure TForm1.TreeView1Click(Sender: TObject);
var
obj: TObject;
begin
selectednode := TTreeView1.Selected;
obj := TDevice(selectednode.Data.AsObject); //Invalid typecast
if obj is TDevice then
showmessage( TDevice(obj).DevName );
end;
