Treeview: Howto clear/remove the node-list/nodes

Question

Hi,<br />I'm new to InDesign programming. <br /><br />I need to load data (simple strings) from a database and display it in a List (Treeview).<br /><br />After some time trying, it now works pretty well. I have a panel on which a TreeView-widget and a button is.<br />When I click the button, a lot of strings from the database should be queried.<br /><br />This works very well, but there are some things I don't understand.<br /><br />First, if I click the load button the TreeView is populated with data. Anyway, if I close the InDesign Application and reopen it some time later, the data is still in the TreeView.<br />Why is that so and how can I prevent it from auto-loading (some time later the data is outdated, the user needs to manually load the data again).<br />I would like to clear the list, maybe in the destructor of the panel, but I don't know how.<br /><br />Second, if I click the load button twice (because I know the data on the server has changed) my load-method tells me that the new data has been loaded, *but* it does not display the correct new values and if I minimize the panel and open it again InDesign crashes (that happens only when I click the load button a second time).<br /><br />Here is my load-method. I took most of the code from the WListBoxComposite-Example and put it in a loop, but I don't fully understand it.<br /><br />> InterfacePtr<IPanelControlData> panelControlData(this, UseDefaultIID());<br />> IControlView* treeWidget = panelControlData->FindWidget(kLTListBoxWidgetID); <br />> InterfacePtr<ITreeViewMgr> treeMgr(treeWidget, UseDefaultIID());<br />> InterfacePtr<IStringListData> iListData(treeWidget, IID_ISTRINGLISTDATA);<br /><br />> K2Vector<PMString>* myData = getObjectList(); // loads the data from my database<br /><br />> K2Vector<PMString> lists = iListData->GetStringList();<br /><br />> for(int i=0; i<myData->size(); ++i) {<br /><br />>      PMString item((*myData)[i]);<br />>      item.Translate();<br /><br />>      lists.insert(lists.end(), item);<br /><br />>      iListData->SetStringList(lists); // don't understand this line<br /><br />>      NodeID node = StringNodeID::Create(item);<br />>      treeMgr->NodeAdded(node);<br /><br />> }<br /><br />> PMString msg("Total: ");<br />> msg.AppendNumber(myData->size());<br />> msg.Append(" entries");<br />> CAlert::InformationAlert(msg);<br /><br />     <br />     <br />I would be grateful if anyone can help me with my problems.<br />Best Wishes<br />Tom

Answer 1

As I looked further in the WListBoxComposite example there is a method which does remove a node from the treeview (WLBCmpActionComponent::DoRemoveItem(...)).
To remove some nodes in this example, they use a
b NodeIDList
. But the ITreeViewControler interface has just one method which provides a
b NodeIDList
namely
i void GetSelectedItems (NodeIDList)
In my plug-in I need a list of all nodes, so that I can remove every item in the treeview.
Is there a method to get such a NodeIDList of all nodes, or is there another way to clear the treeview?
I would still be grateful if someone can help me out.
Best Wishes
Tom
btw.: I haven't found out yet why the data in the treeview is persistent. So that when I close the application and re-open it the treeview is still full of (outdated) data.