In the previous chapter we use and program only two kinds of control in our dialog (Text edit controls and buttons). We intend in this chapter to go further and use a lot of controls and then see how things work in this area. You cannot read this chapter before reading the previous one, particularly because only code snippets are presented.

We begin again with our counter.

Counter with Numeric Field

When designing the dialog working with our counter, we take two text controls for our numeric data (as input with "setCount" button and as output with "getCount" button). Because text controls are often used our preceding example is important, but it's time now to improve our design and use a numeric field control. Because the dialog aspect is unchanged we don't provide a snapshot of the dialog.

Have a look at com.sun.star.awt.XNumericField interface and see what can be done with this interface : only getvalue and setValue will be used in this section, but you can play with other methods. We provide only the callHandlerMethod function method in the listing below (see the previous chapter and also the corresponding com.sun.star.awt.XDialogEventHandler interface). The corresponding code is as follows.

// Listing 1
// c++
sal_Bool SAL_CALL MyCounterImpl::callHandlerMethod(const Reference< XDialog >& xDialog,const Any& EventObject,const OUString & MethodName ) throw(WrappedTargetException, RuntimeException ){
  if (MethodName.equalsAscii("foo1")){//increment
	increment();
	return sal_True;
  }
  if (MethodName.equalsAscii("foo2")){//decrement
	decrement();
	return sal_True;
  }
  if (MethodName.equalsAscii("foo3")){ //setCount
	Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl=xControlContainer->getControl(OUString::createFromAscii("NumericField1"));
	Reference< XNumericField > xNumericField(xControl,UNO_QUERY);
	setCount((sal_Int32)xNumericField->getValue());
	return sal_True;  
  } 
  if (MethodName.equalsAscii("foo4")){ //getCount
	Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl=xControlContainer->getControl(OUString::createFromAscii("NumericField2"));
	Reference< XNumericField > xNumericField(xControl,UNO_QUERY);
	xNumericField->setValue(getCount());
	return sal_True;
   }
  return sal_False;
}

There is no need to go into this listing in full detail here. We turn now to another interesting example of control : the radio button.

Using Radio buttons

An option button control com.sun.star.awt.UnoControlRadioButton is a simple switch with two states, that is selected by the user. Usually option buttons are used in groups to display several options, that the user may select. While option buttons and check boxes seem to be similar, selecting one option button deselects all the other option buttons in the same group.

We want use radio button to select the increment or decrement (between 1, 5 and 10). Here is a snapshot of our dialog :

Our Second Counter Dialog

where you see a decrement or increment of value five is selected.

For this problem the com.sun.star.awt.XRadioButton interface is your friend. We intend to provide two solutions for this example. We begin with a solution which use only the four methods of the counter.

A simple solution

This solution keeps the four previous methods managed by callHandlerMethod() named "foo1", "foo2", .. "foo4" of the com.sun.star.awt.XDialogEventHandler interface. To put it differently no new event is managed by the dialog. We present now the corresponding code, and again with only the callHandlerMethod. Have a look at the previous chapter if you want to remember you how it works.

// Listing 2
// C++
sal_Bool SAL_CALL MyCounterImpl::callHandlerMethod(const Reference< XDialog >& xDialog,const Any& EventObject,const OUString & MethodName ) throw(WrappedTargetException, RuntimeException ){
  if (MethodName.equalsAscii("foo1")){//increment
        Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl=xControlContainer->getControl(OUString::createFromAscii("OptionButton1"));
	Reference< XRadioButton > xRadioButton(xControl,UNO_QUERY);
	if (xRadioButton->getState())  m_nDelta=1;
	xControl=xControlContainer->getControl(OUString::createFromAscii("OptionButton2"));
	Reference< XRadioButton > xRadioButton2(xControl,UNO_QUERY);
	if (xRadioButton2->getState())  m_nDelta=5;
	xControl=xControlContainer->getControl(OUString::createFromAscii("OptionButton3"));
	Reference< XRadioButton > xRadioButton3(xControl,UNO_QUERY);
	if (xRadioButton3->getState())  m_nDelta=10;
	increment();
	return sal_True;
  }
  if (MethodName.equalsAscii("foo2")){//decrement
	Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl=xControlContainer->getControl(OUString::createFromAscii("OptionButton1"));
	Reference< XRadioButton > xRadioButton(xControl,UNO_QUERY);
	if (xRadioButton->getState())  m_nDelta=1;
	xControl=xControlContainer->getControl(OUString::createFromAscii("OptionButton2"));
	Reference< XRadioButton > xRadioButton2(xControl,UNO_QUERY);
	if (xRadioButton2->getState())  m_nDelta=5;
	xControl=xControlContainer->getControl(OUString::createFromAscii("OptionButton3"));
	Reference< XRadioButton > xRadioButton3(xControl,UNO_QUERY);
	if (xRadioButton3->getState())  m_nDelta=10;
	decrement();
	return sal_True;
  }
  if (MethodName.equalsAscii("foo3")){ //setCount
	Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl=xControlContainer->getControl(OUString::createFromAscii("NumericField1"));
	Reference< XNumericField > xNumericField(xControl,UNO_QUERY);
	setCount((sal_Int32)xNumericField->getValue());
	return sal_True;  
  } 
  if (MethodName.equalsAscii("foo4")){ //getCount
	Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl=xControlContainer->getControl(OUString::createFromAscii("NumericField2"));
	Reference< XNumericField > xNumericField(xControl,UNO_QUERY);
	xNumericField->setValue(getCount());
	return sal_True;
   }
  return sal_False;
}

As you can see only increment() and decrement() methods are looking for the radiobutton which is set. The corresponding checking code is completely similar in both method, then it would be better to put it in a function. No event is fired when setting or cleared a radio button in this example. But it is possible to call a method when status is changed : note in this case, you have to provide a method for every buttons. Let's us now examine this second solution.

Managing Radio Buttons Events

Every times a user set or clear a radio button a method is fired : you have to edit the corresponding property of your option button. That means you have to manage an event when clicking with mouse button (see again Developer's Guide). Because there are three radio buttons we have to add three methods. We see this kind of solution could become too complex while the number of button is increasing.

The code is as follows :

// C++
// Listing 3
sal_Bool SAL_CALL MyCounterImpl::callHandlerMethod(const Reference< XDialog >& xDialog,const Any& EventObject,const OUString & MethodName ) throw(WrappedTargetException, RuntimeException ){
  if (MethodName.equalsAscii("foo1")){//increment
	increment();
	return sal_True;
  }
  if (MethodName.equalsAscii("foo2")){//decrement
	decrement();
	return sal_True;
  }
  if (MethodName.equalsAscii("foo3")){ //setCount
	Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl=xControlContainer->getControl(OUString::createFromAscii("NumericField1"));
	Reference< XNumericField > xNumericField(xControl,UNO_QUERY);
	setCount((sal_Int32)xNumericField->getValue());
	return sal_True;  
  } 
  if (MethodName.equalsAscii("foo4")){ //getCount
	Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl=xControlContainer->getControl(OUString::createFromAscii("NumericField2"));
	Reference< XNumericField > xNumericField(xControl,UNO_QUERY);
	xNumericField->setValue(getCount());
	return sal_True;
   }
   if (MethodName.equalsAscii("foo5")){ //incr/decr +/-1
	if (m_nDelta!=1) m_nDelta=1;
	return sal_True;
   }
   if (MethodName.equalsAscii("foo6")){ //incr/decr +/-5
	if (m_nDelta!=5) m_nDelta=5;
	return sal_True;
   }
   if (MethodName.equalsAscii("foo7")){ //incr/decr +/-10
	if (m_nDelta!=10) m_nDelta=10;
	return sal_True;
   }
  return sal_False;
}

Sequence< OUString > SAL_CALL MyCounterImpl::getSupportedMethodNames() throw (RuntimeException){
  Sequence< OUString > SeqOUStr(7);
  SeqOUStr[0]=OUString::createFromAscii("foo1");
  SeqOUStr[1]=OUString::createFromAscii("foo2");
  SeqOUStr[2]=OUString::createFromAscii("foo3");
  SeqOUStr[3]=OUString::createFromAscii("foo4");
  SeqOUStr[4]=OUString::createFromAscii("foo5");
  SeqOUStr[5]=OUString::createFromAscii("foo6");
  SeqOUStr[6]=OUString::createFromAscii("foo7");
  return SeqOUStr;
}

This code is working without reading the state of the radio button but I cannot certify it could be the case in any situation you will encounter. Note that we have already provided a code to access to the state of a radio button in the previous section. Note also m_nDelta is a new member value set to 1 by the constructor (corresponding to the default selected radio button).

Using a listbox in a dialog

In this section, we replace the radio button control with a list box. Have a look in com.sun.star.awt.XListBox inteface. We only use the getSelectedItemPos() method in the following code.

// XDialogEventHandler implementation
// C++
// Listing 4
sal_Bool SAL_CALL MyCounterImpl::callHandlerMethod(const Reference< XDialog >& xDialog,const Any& EventObject,const OUString & MethodName ) throw(WrappedTargetException, RuntimeException ){
  if (MethodName.equalsAscii("foo1")){//increment
        Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl=xControlContainer->getControl(OUString::createFromAscii("ListBox1"));
	Reference< XListBox > xListBox(xControl,UNO_QUERY);
	switch (xListBox->getSelectedItemPos()){
	case 0:  m_nDelta=1;break;
	case 1:  m_nDelta=5;break;
	case 2:  m_nDelta=10;break;
	}
	increment();
	return sal_True;
  }
  if (MethodName.equalsAscii("foo2")){//decrement
	Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl=xControlContainer->getControl(OUString::createFromAscii("ListBox1"));
	Reference< XListBox > xListBox(xControl,UNO_QUERY);
	switch (xListBox->getSelectedItemPos()){
	case 0:  m_nDelta=1;break;
	case 1:  m_nDelta=5;break;
	case 2:  m_nDelta=10;break;
	}
	decrement();
	return sal_True;
  }
  if (MethodName.equalsAscii("foo3")){ //setCount
	Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl=xControlContainer->getControl(OUString::createFromAscii("NumericField1"));
	Reference< XNumericField > xNumericField(xControl,UNO_QUERY);
	setCount((sal_Int32)xNumericField->getValue());
	return sal_True;  
  } 
  if (MethodName.equalsAscii("foo4")){ //getCount
	Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl=xControlContainer->getControl(OUString::createFromAscii("NumericField2"));
	Reference< XNumericField > xNumericField(xControl,UNO_QUERY);
	xNumericField->setValue(getCount());
	return sal_True;
   }
  return sal_False;
}

which yields the dialog below :

Our Third Counter Dialog

Multi-Page Dialog

The multi-page dialog is tackled in OOBasic Document. Our goal is to use a multipage dialog with our counter and see how it works. Our second page will be very similar to the simple dialog we have already encountered, and the first one manage increment step. The great difference is we have to manage more buttons, particularly the "cancel", "<<previous", "next>>" and "OK" buttons. Because I never make multi-page dialog working before writing this section, I begin with the corresponding OOBasic program.

As already explained, I think it's a good practice to solve a problem in OOoBasic before solving it in C++. Before starting this document, OOBasic was already documented in a BASIC Guide (and also in books) but you have only few examples in the SDK to learn the corresponding C++ part. In my knowledge there is no C++/UNO book. The other great reason is the need of OOBasic GUI when constructing the dialog : and then writing a OOBasic program is only a little step.

OOBasic program

We first give the OOBasic program. The first part after the main is corresponding to the Counter, and the second part is corresponding to the next previous (Step) management. This management is realized with two Sub :

"cmdPrev_Initiated" sub,
"cmdNext_Initiated" sub.

When you are in Step=1 the previous button is disabled, while in the Step=2 the next button has to be disabled.

REM  *****  BASIC  *****
'Listing 5
Dim Dlg As Object
Dim Count As integer 
Dim IncrDecr As integer

Sub Main
  DialogLibraries.LoadLibrary("Standard")
  Dlg = CreateUnoDialog(DialogLibraries.Standard.Dialog2)
'Because of Multi-page don't forget to manage Step :
  Dlg.Model.Step=1
  Dlg.Execute()
  Dlg.dispose()
End Sub

'Our counter begins here <-----------
Sub Increment
  Count = Count + IncrDecr
End Sub

Sub Decrement
  Count = Count - IncrDecr
End Sub    

Sub getCount
   Dim oNumericField
   oNumericField = Dlg.getControl("NumericField2")
   oNumericField.Value = Count
End Sub

Sub setCount
   Dim oNumericField
   oNumericField = Dlg.getControl("NumericField1")
   Count = oNumericField.Value
End Sub
' Our Counter ends here <------------

Sub cmdNext_Initiated
   Dim cmdNext As Object
   Dim cmdPrev As Object
   cmdPrev = Dlg.getControl("cmdPrev")
   'inspect(cmdPrev)
   cmdNext = Dlg.getControl("cmdNext")
   cmdPrev.Model.Enabled = Not cmdPrev.Model.Enabled
   cmdNext.Model.Enabled = False
   'if Next update IncrDecr
   If Dlg.Model.Step = 1 Then
     If Dlg.getControl("OptionButton1").State Then
       IncrDecr = 1
     End If
     If Dlg.getControl("OptionButton2").State Then
       IncrDecr = 5
     End If
     If Dlg.getControl("OptionButton3").State Then
       IncrDecr = 10
     End If    
   End If
   Dlg.Model.Step = Dlg.Model.Step + 1 
End Sub
 
Sub cmdPrev_Initiated
   Dim cmdNext As Object
   Dim cmdPrev As Object
   cmdPrev = Dlg.getControl("cmdPrev")
   cmdNext = Dlg.getControl("cmdNext")
   cmdPrev.Model.Enabled = False
   cmdNext.Model.Enabled = True
   Dlg.Model.Step = Dlg.Model.Step - 1 
End Sub

Note also that the radio buttons are checked only when clicking on the Next button in Step 1. The dialog then changes its appearance as follows:

Page 1 (Step 1 in OOBasic code)

where you see "<<Previous" button disabled and

Page 2 (Step 2 in OOBasic code)

where you see "Next>>" button is disabled.

C++ program

Our goal in this section is to reuse the previous multi-page dialog but with C++. It was easy for me to manage the Next Previous buttons in OOBasic but spend many hours for translating the simple OOBasic line :

REM  *****  BASIC  *****
Dlg.Model.Step = Dlg.Model.Step + 1

Finally Java Inspector C++ automatic code generation shows me the way. The code is as follows :

// C++
// Listing 6
// XDialogEventHandler implementation
sal_Bool SAL_CALL MyCounterImpl::callHandlerMethod(const Reference< XDialog >& xDialog,const Any& EventObject,const OUString & MethodName ) throw(WrappedTargetException, RuntimeException ){
  if (MethodName.equalsAscii("increment")){//increment
	increment();
	return sal_True;
  }
  if (MethodName.equalsAscii("decrement")){//decrement
	decrement();
	return sal_True;
  }
  if (MethodName.equalsAscii("setCount")){ //setCount
	Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl=xControlContainer->getControl(OUString::createFromAscii("NumericField1"));
	Reference< XNumericField > xNumericField(xControl,UNO_QUERY);
	setCount((sal_Int32)xNumericField->getValue());
	return sal_True;  
  } 
  if (MethodName.equalsAscii("getCount")){ //getCount
	Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl=xControlContainer->getControl(OUString::createFromAscii("NumericField2"));
	Reference< XNumericField > xNumericField(xControl,UNO_QUERY);
	xNumericField->setValue(getCount());
	return sal_True;
   }
   if (MethodName.equalsAscii("cmdPrev_Initiated")){ //<<Previous
// xDialog is a parameter
	Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl=xControlContainer->getControl(OUString::createFromAscii("cmdPrev"));
//com.sun.star.awt.XConrolModel
	Reference< XControlModel> xControlModel= xControl->getModel();
	Any any;
	sal_Bool Boolval;
	Reference< XPropertySet > xPropertySet( xControlModel,UNO_QUERY);
	any=xPropertySet->getPropertyValue(OUString::createFromAscii("Enabled"));
	any >>= Boolval;
	Boolval = !Boolval;
	any <<= Boolval;
	xPropertySet->setPropertyValue(OUString::createFromAscii("Enabled"),any);

	xControl=xControlContainer->getControl(OUString::createFromAscii("cmdNext"));
	xControlModel= xControl->getModel();
	Reference< XPropertySet > xPropertySet2( xControlModel,UNO_QUERY);
	any=xPropertySet2->getPropertyValue(OUString::createFromAscii("Enabled"));
	any >>= Boolval;
	Boolval = !Boolval;
	any <<= Boolval;
	xPropertySet2->setPropertyValue(OUString::createFromAscii("Enabled"),any);
	
// found with JavaInspector C++ code generation	:Step property management
	sal_Int32 step;
	Reference< XControl > xControl2 (xDialog,UNO_QUERY_THROW);
	xControlModel= xControl2->getModel(); 
	Reference< XPropertySet > xPropertySet3( xControlModel,UNO_QUERY);
	step = 1;
	any <<= step;
	xPropertySet3->setPropertyValue(OUString::createFromAscii("Step"),any);
	return sal_True;
   }
  if (MethodName.equalsAscii("cmdNext_Initiated")){ //Next>>
// xDialog is a parameter
	Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl=xControlContainer->getControl(OUString::createFromAscii("cmdPrev"));
//com.sun.star.awt.XConrolModel
	Reference< XControlModel> xControlModel= xControl->getModel();
	Any any;
	sal_Bool Boolval;
	Reference< XPropertySet > xPropertySet( xControlModel,UNO_QUERY);
	any <<= sal_True;
	xPropertySet->setPropertyValue(OUString::createFromAscii("Enabled"),any);

	xControl=xControlContainer->getControl(OUString::createFromAscii("cmdNext"));
	xControlModel= xControl->getModel();
	Reference< XPropertySet > xPropertySet2( xControlModel,UNO_QUERY);
	any <<= sal_False;
	xPropertySet2->setPropertyValue(OUString::createFromAscii("Enabled"),any);
// RadioButton management : not great with such if !
	xControl=xControlContainer->getControl(OUString::createFromAscii("OptionButton1"));
	Reference< XRadioButton > xRadioButton(xControl,UNO_QUERY);
	if (xRadioButton->getState())  m_nDelta=1;
	xControl=xControlContainer->getControl(OUString::createFromAscii("OptionButton2"));
	Reference< XRadioButton > xRadioButton2(xControl,UNO_QUERY);
	if (xRadioButton2->getState())  m_nDelta=5;
	xControl=xControlContainer->getControl(OUString::createFromAscii("OptionButton3"));
	Reference< XRadioButton > xRadioButton3(xControl,UNO_QUERY);
	if (xRadioButton3->getState())  m_nDelta=10;
// found with JavaInspector C++ code generation	
	sal_Int32 step;
	// the trick is here : not line below 
	// Reference< XControl >xControl2=xControlContainer->getControl(OUString::createFromAscii("Dialog1"))
	Reference< XControl > xControl2 (xDialog,UNO_QUERY_THROW);
	xControlModel= xControl2->getModel(); 
	Reference< XPropertySet > xPropertySet3( xControlModel,UNO_QUERY);
	step = 2;
	any <<= step;
	xPropertySet3->setPropertyValue(OUString::createFromAscii("Step"),any);
	return sal_True;
   } 
  return sal_False;
}
Sequence< OUString > SAL_CALL MyCounterImpl::getSupportedMethodNames() throw (RuntimeException){
  Sequence< OUString > SeqOUStr(6);
  SeqOUStr[0]=OUString::createFromAscii("increment");
  SeqOUStr[1]=OUString::createFromAscii("decrement");
  SeqOUStr[2]=OUString::createFromAscii("setCount");
  SeqOUStr[3]=OUString::createFromAscii("getCount");
  SeqOUStr[4]=OUString::createFromAscii("cmdNext_Initiated");
  SeqOUStr[5]=OUString::createFromAscii("cmdPrev_Initiated");
  return SeqOUStr;
}

See com.sun.star.awt.XControl, com.sun.star.awt.XControlContainer, com.sun.star.awt.XControlModel and com.sun.star.beans.XPropertySet, Interfaces.

We turn now to other examples where we leave our Counter only because it's too simple.

The New Tree Control

The New Tree Contol is tackled here but the corresponding article is under construction (since 2006). Frankly speaking I am not completly satisfied with this control at the moment for different reasons :

the tree expanded listener is useless if your node has no child (not fired). This raises probably problems when wanting to manage a dynamic tree (for instance for an introspection tool)
The event property in OpenOffice.org dialog editor is too simple and is unable to replace event listener. For instance there is no event to manage a selection change as in Radio Button.

You probably wonder why I take time to write a documentation in such a situation. It's only because I think if the documentation lack nobody will use this control and then nobody will improve the code of this control. And also, I finally achieve to make dynamic trees working with only adding a button (without event listener and without an expanding event). I by-pass then both drawbacks previously evocated.

The most important concept underlying the Tree Control is that of complete separation between data and how that data is displayed on the screen. This is commonly known as Model/View/Controller-design (MVC)

com.sun.star.awt.tree.XMutableTreeDataModel and com.sun.star.awt.tree.XMutableTreeNode interfaces are related to the model,
com.sun.star.awt.tree.XTreeControl is related to the control and view.

Our starting OOoBasic program

rvc44 posted in OOOForum (Thu Dec 20, 2007) an example in OOoBasic which serves me as starting point. I have added event listener and obtain the code snippet as follows :

REM  *****  BASIC  *****
'Listing 7
Option Explicit
'Most of this code belongs to rvc44 http://www.oooforum.org/forum/viewtopic.phtml?t=67005&highlight=
Private oDlg as Object, oLbDescription as Object
Private oTreeCtrl as Object, oTreeModel as Object
Private oMutableTreeDataModel  as Object
Private oRootNode as Object, oChildNode as Object, ogNode as Object


Sub mainTree '[Simple example: collapsing and expanding folders]
   DialogLibraries.loadLibrary("Standard")
   
   'create the dialog
   oDlg = CreateUnoDialog(DialogLibraries.Standard.SimpleTreeDialog)
   If IsNull(oDlg) Then Exit Sub
   
   'get a refrence to the control/s and its model/s
   oLbDescription = oDlg.getControl("lbDescription")
   oLbDescription.setText( "A very simple tree control with listeners." & _
                     chr(13) & chr(13) &_
                     "Expanding and collapsing happends automatically" )
   
   oTreeCtrl = oDlg.getControl("TreeControl1")
   oTreeModel = oTreeCtrl.Model   

   'XRay oTreeModel
   'instantiate the MutableTreeDataModel service
   oMutableTreeDataModel = createUnoService(_
         "com.sun.star.awt.tree.MutableTreeDataModel")
   'XRay oMutableTreeDataModel
   'MutableTreeDataModel implemets XMutableTreeDataModel
   'use XMutableTreeNode::createNode(
   '                  [in] any DisplayValue,
   '                  [in] boolean ChildsOnDemand )
   'to create the root node
   'If you pass to the boolean parameter TRUE as a argument,
   'the created node will be treated as a non-leaf (branch) node
   'by the XTreeControl , even when it has no child nodes.
   'If false, the node will be a leaf.
   'The root should obviously be a non-leaf node.
   oRootNode = oMutableTreeDataModel.createNode( "Root", true )  
   'use XMutableTreeNode::setRoot( [in] XMutableTreeNode RootNode )
   'to set this node as the root of the model
   oMutableTreeDataModel.setRoot(oRootNode)

   'now create the children of the root
   
   Dim oChildNode1
   oChildNode1 = oMutableTreeDataModel.createNode( "Parent 1", true )
   oRootNode.appendChild(oChildNode1)   
      'Create this child's own children      
            'In two steps:
            Dim oSubChildNode
            oSubChildNode = oMutableTreeDataModel.createNode(_
               "Child 1", true )
            oChildNode1.appendChild(oSubChildNode)
                  'In only one:
                  'Go deeper in the hierarchical structure
                  oSubChildNode.appendChild( _
                     oMutableTreeDataModel.createNode( _
                        "Grandson 1", false ) )
                  oSubChildNode.appendChild( _
                     oMutableTreeDataModel.createNode( _
                        "Grandson 2", false ) )
            
            'In only one:
            oChildNode1.appendChild( oMutableTreeDataModel.createNode( _
                                 "Child 2", true ) )
   
   '=======================================================================
   'As you see, the Data Model always creates the nodes
   '(XMutableDataModel::createNode)
   'and then you add it to the node you want, taking care that
   'the node created and the parent node belong to the same data model
   
   Dim oChildNode2
   oChildNode2 = oMutableTreeDataModel.createNode( "Parent 2", true )
   oRootNode.appendChild(oChildNode2)
   
   Dim oChildNode3
   oChildNode3 = oMutableTreeDataModel.createNode( "Parent 3", FALSE )
   'oChildNode3.setCollapsedGraphicURL( ANY_DOC )
   'oChildNode3.setExpandedGraphicURL( ANY_DOC )
   'oChildNode3.setNodeGraphicURL( BASIC_BRAKE )
   oRootNode.appendChild(oChildNode3)
   
   Dim oChildNode4
   oChildNode4 = oMutableTreeDataModel.createNode( "Parent 4", true )
   oRootNode.appendChild(oChildNode4)
   
   Dim oChildNode5
   oChildNode5 = oMutableTreeDataModel.createNode( "Parent 5", true )
   oRootNode.appendChild(oChildNode5)
   
   Dim oChildNode6
   oChildNode6 = oMutableTreeDataModel.createNode( "Parent 6", FALSE )
   oRootNode.appendChild(oChildNode6)
      'Although the API refrence states the following:
      '   "If you want to add child nodes to your tree on demand
      '   you can .[..] Make sure the parent node returns true
      '   for XTreeNode::hasChildsOnDemand() either by implementing
      '   XTreeNode yourself or, if you use the MutableTreeDataModel ,
      '   use XMutableTreeNode::setHasChildsOnDemand() ."
      'https://www.openoffice.org/api/docs/common/ref/com/sun/star/awt/tree/TreeControl.html
      Dim bHasChildernOnDemand as Boolean
      'in this case hasChildsOnDemand returns FALSE
      'bHasChildernOnDemand = oChildNode6.hasChildsOnDemand()
      Dim aChild : aChild = oMutableTreeDataModel.createNode( "Grandson", FALSE )
      'BUT the node is appended to this node that has no children on demand
      oChildNode6.appendChild(aChild)
      'Should it throw an exception?
   
   'set the data model at the TreeControlModel::DataModel property.
   oTreeModel.DataModel = oMutableTreeDataModel
   
   ' oTreeCtrl.DefaultExpandedGraphicURL = FOLDER_OPEN
   'oTreeCtrl.DefaultCollapsedGraphicURL = FOLDER_CLOSED
   
   Dim oListener,oListener2
   oListener = CreateUnoListener("Tree_","com.sun.star.awt.tree.XTreeExpansionListener")
   oListener2 = createUnoListener("Select_","com.sun.star.view.XSelectionChangeListener")
   'Xray oListener2
   oTreeCtrl.addTreeExpansionListener(oListener)
   oTreeCtrl.addSelectionChangeListener(oListener2)
   oDlg.execute()
   oTreeCtrl.removeSelectionChangeListener(oListener2)
   oTreeCtrl.removeTreeExpansionListener(oListener)
   oDlg.dispose()
End Sub

Sub Tree_treeExpanding(oEvt)
'oEvt.Node has methods :
  'getChildAt 	Returns the child tree node at Index .  
  'getChildCount 	Returns the number of child nodes.  
  'getParent 	Returns the parent node of this node.  
  'getIndex 	Returns the index of Node in this instances children.  
  'hasChildsOnDemand 	Returns true if the children of this node are created on demand.  
  'getDisplayValue 	If not empty, the textual representation of this any is used as the text part of this node.  
  'getNodeGraphicURL 	The URL for a graphic that is rendered before the text part of this node.  
  'getExpandedGraphicURL 	The URL for a graphic that is rendered to visualize expanded non leaf nodes.  
  'getCollapsedGraphicURL 	The URL for a graphic that is rendered to visualize collapsed non leaf nodes.
   MsgBox("Node : " & oEvt.Node.getDisplayValue &" expanding")
   ogNode = oEvt.Node
end sub
Sub Tree_treeExpanded(oEvt)
'   MsgBox("Tree expanded")
end sub
Sub Tree_treeCollapsing(oEvt)
   'MsgBox("Tree collapsing")
end sub
Sub Tree_treeCollapsed(oEvt)
'   MsgBox("Tree collapsed")
end sub
Sub Tree_requestChildNodes(oEvt)
  'print oEvt.Node.getIndex(oEvt.Node)
    'XRay oEvt.Node
'   Msgbox ("Tree_requestChildNodes")
End Sub
Sub Tree_disposing(oEvt)
'   Msgbox ("Tree_disposing")
End Sub   
Sub Select_selectionChanged(oEvt)
  MsgBox("Selection Changed")
end sub

Here is the corresponding snapshot

Our tree control with treeExpanding listener messageBox

where you see a "treeExpanding" listener at work, and the second with another listener ("selection change") at work.

Our tree control with selectionChanged listener messageBox

If you want to construct such a tree with another programming language, you have to investigate the corresponding interfaces :

com.sun.star.awt.tree.XMutableTreeDataModel with createNode and setRoot methods,
com.sun.star.awt.tree.XMutableTreeNode with appendChild method,
com.sun.star.awt.tree.XTreeControl -|> com.sun.star.view.XMultiSelectionSupplier -|> com.sun.star.view.XSelectionSupplier with getSelection method (-|> is a simplified inheritance notation).

It's time to examine the C++ translation of this example.

C++ Code without Listener

As usual we plan to use the previous OOoBasic dialog but with C++ code. Because we only want a demonstration we will simplify the Tree. Our goal is to retrieve the expanded node but as mentioned in the section title we don't want to use listener that means we want only to manage events of the tree dialog control with our member functions. We will investigate first with OOoBasic.

Managing Events of Tree Control with OOoBasic

Our goal is simple : retrieve the selected node of the tree. We first remove all the event listener of the OOoBasic code :

REM  *****  BASIC  *****
'Listing 8
...

Sub mainTree '[Simple example: collapsing and expanding folders]

   .....
   'Dim oListener,oListener2
   'oListener = CreateUnoListener("Tree_","com.sun.star.awt.tree.XTreeExpansionListener")
   'oListener2 = createUnoListener("Select_","com.sun.star.view.XSelectionChangeListener")
   'Xray oListener2
   'oTreeCtrl.addTreeExpansionListener(oListener)
   'oTreeCtrl.addSelectionChangeListener(oListener2)
   oDlg.execute()
   'oTreeCtrl.removeSelectionChangeListener(oListener2)
   'oTreeCtrl.removeTreeExpansionListener(oListener)
   oDlg.dispose()
End Sub

We choose among the events shown below

The manageable Events of a Tree Control

where you can see the Losing Focus Event ("perte de focus" in French) is used with the sub :

REM  *****  BASIC  *****
'Listing 9
Sub LosingFocus(Event As Object)
  'inspect(oTreeCtrl)
  'getSelection is member function of com.sun.star.awt.tree.XTreeControl interface
  'getDisplayValue is member function of com.sun.star.awt.tree.XTreeNode interface
  MsgBox(oTreeCtrl.getSelection.getDisplayValue())
End Sub

When expanding the tree and selecting a node, you only click in the Text control to see the result

Retrieving the Name of the selected Node

where you see the LosingFocus Sub above is fired.

Managing Events of Tree Control with a C++ member function

We change the preceding OOoBasic example in four ways :

we simplify the tree to be displayed,
we display the selection in the already present control text instead of in a message Box,
because we are dealing with components (and not addon) we have to start from an IDL file. I have keept the counter IDL file even if my new Dialog is unable to make it working.
the "losing focus" event property is bound to a component method called "LosingFocus" (see Developper's Guide).

The new Constructor

The constructor has to display the tree in the corresponding control. To say it differently we shall find almost of the OOoBasic "mainTree" sub of the previous example in this constructor. The code is then as follows :

// cpp
// Listing 10
inline MyCounterImpl( Reference< XComponentContext > const & xContext) throw ()
        : m_xContext( xContext ) {
	m_xMCF=m_xContext->getServiceManager();
	Reference< XDesktop > xDesktop(
            m_xMCF->createInstanceWithContext( 
            OUString( RTL_CONSTASCII_USTRINGPARAM( "com.sun.star.frame.Desktop" ) ),
            xContext ), UNO_QUERY_THROW );
	Reference< XComponent > xcomponent = xDesktop->getCurrentComponent(); 
	Sequence< Any> Args(1);
	Args[0] <<= xcomponent;
	Reference< XDialogProvider2 > xDialog2(m_xMCF->createInstanceWithArgumentsAndContext( 
            					OUString( RTL_CONSTASCII_USTRINGPARAM( "com.sun.star.awt.DialogProvider2" ) ),
						Args,
						xContext),
						UNO_QUERY_THROW );
// Uncomment below and comment above if you want the OOoDesktop as parent of your dialog
//	Reference< XDialogProvider2 > xDialog2(m_xMCF->createInstanceWithContext( 
//            					OUString( RTL_CONSTASCII_USTRINGPARAM( "com.sun.star.awt.DialogProvider2" ) ),
//						xContext),
//						UNO_QUERY_THROW );
	Reference< XDialog > xDialog=xDialog2->createDialogWithHandler(
		OUString::createFromAscii( "vnd.sun.star.script:Standard.SimpleTreeDialog?location=application" ),
		(XCountable *)this);
// Constructing the Tree (17th Jul 2009)
	Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl = xControlContainer->getControl(OUString::createFromAscii("TreeControl"));
	Reference< XMutableTreeDataModel > xTreeMutDatMod (m_xMCF->createInstanceWithContext(
			OUString::createFromAscii("com.sun.star.awt.tree.MutableTreeDataModel"),xContext),UNO_QUERY_THROW);
//	Reference< XMutableTreeDataModel > xTreeMutDatMod(xTreeControl,UNO_QUERY); //NO NO NO:hangs the office
	Any any;
	any <<= OUString::createFromAscii("root");
	Reference< XMutableTreeNode > xMTN=xTreeMutDatMod->createNode(any,sal_True);
	xTreeMutDatMod->setRoot(xMTN);
	any <<= OUString::createFromAscii("Parent 1");
	Reference< XMutableTreeNode > xChildNode = xTreeMutDatMod->createNode(any,sal_True);
	xMTN->appendChild(xChildNode);
		any <<= OUString::createFromAscii("Child 1");
		Reference< XMutableTreeNode > xChildNode2 = xTreeMutDatMod->createNode(any,sal_True);
		xChildNode->appendChild(xChildNode2);
			any <<= OUString::createFromAscii("Grandson 1");
			Reference< XMutableTreeNode > xChildNode3 = xTreeMutDatMod->createNode(any,sal_False);
			xChildNode2->appendChild(xChildNode3);
			any <<= OUString::createFromAscii("Grandson 2");
			xChildNode3 = xTreeMutDatMod->createNode(any,sal_False);
			xChildNode2->appendChild(xChildNode3);
		any <<= OUString::createFromAscii("Child 2");
		xChildNode2 = xTreeMutDatMod->createNode(any,sal_True);
		xChildNode->appendChild(xChildNode2);
	any <<=  OUString::createFromAscii("Parent 2");
	xChildNode=xTreeMutDatMod->createNode(any,sal_True);
	xMTN->appendChild(xChildNode);
// set the model to see the tree in control (two hours to find the four lines below)
// translation of oTreeModel = oTreeCtrl.Model and oTreeModel.DataModel = oMutableTreeDataModel
        Reference< XControlModel > xControlModel=xControl->getModel();
	Reference< XPropertySet > xPropertySet( xControlModel,UNO_QUERY);
	any <<= xTreeMutDatMod;
	xPropertySet->setPropertyValue(OUString::createFromAscii("DataModel"),any);
// execute dialog
	xDialog->execute();
	}

The "LosingFocus" method

The LosingFocus sub in OOoBasic was very simple. I have translated it with Introspection tools and IDL documentation like com.sun.star.awt.tree.XTreeControl, com.sun.star.awt.tree.XTreeNode and com.sun.star.awt.XTextComponent.

// C++
// Listing 11
sal_Bool SAL_CALL MyCounterImpl::callHandlerMethod(const Reference< XDialog >& xDialog,const Any& EventObject,const OUString & MethodName ) throw(WrappedTargetException, RuntimeException ){
  if (MethodName.equalsAscii("LosingFocus")){//When Losing Focus in Tree control
        Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl = xControlContainer->getControl(OUString::createFromAscii("TreeControl"));
// com.sun.star.awt.tree.XTreeControl
        Reference< XTreeControl > xTreeControl(xControl,UNO_QUERY);
	Any any=xTreeControl->getSelection();
	Reference< XTreeNode > xTreeNode;
        any >>= xTreeNode;
	// put the result of selection in text control
	xControl = xControlContainer->getControl(OUString::createFromAscii("lbDescription"));
        Reference< XTextComponent > xTextComponent(xControl,UNO_QUERY);
	any = xTreeNode->getDisplayValue();
	OUString OUStr;
 	any >>= OUStr;
	xTextComponent->setText(OUStr + OUString::createFromAscii(" -- DONE --"));
	return sal_True;
  }
  return sal_False;
}

This method is called when losing focus : click in the text control, for instance.

Here is a snapshot of the corresponding dialog :

The new Tree Control at work

Because only a method is used, you have also to change the getSupportedMethodNames() member function :

// C++
// Listing 12
Sequence< OUString > SAL_CALL MyCounterImpl::getSupportedMethodNames() throw (RuntimeException){
  Sequence< OUString > SeqOUStr(1);
  SeqOUStr[0]=OUString::createFromAscii("LosingFocus");
//  SeqOUStr[1]=OUString::createFromAscii("foo2");
//  SeqOUStr[2]=OUString::createFromAscii("foo3");
//  SeqOUStr[3]=OUString::createFromAscii("foo4");
  return SeqOUStr;
}

I am not sure xml2cmp tools which proceeds the CppComponent.uno.xml file is able to work with a type as follows :

<type>com.sun.star.awt.tree.XTreeControl</type>

In this type, there is four level (com/sun/star/tree) before the module name, instead of usually three. Is the problem here ?

Have added it to MakeFile to make it working. If you confirm or infirm that, please contact me.SergeMoutou 16:30, 17 July 2009 (UTC)

C++ code with listener

Altough I like event listener in OOoBasic I dislike them in C++ : they are easy to use in OOoBasic but hard in C++. Then I don't know when I will write such a documentation.

TO DO

Dynamic Trees

In this section, we want to Investigate how to manage a dynamic tree. A dynamic tree is a tree that is constructed on the demand.

Dynamic Trees in OOoBasic

In fact I begun to write the next section first. Because I encounter some problem I decided to write this section. After many hours I was not able to make dynamic tree working in C++ while it takes me only few minutes to make it working in OOoBasic ! FYI : dynamic Trees in C++ in the next section are working now.

I keep the initial OOoBasic tree and add two buttons : "OK" button and "add Child" button. You select a node and when clicking on "add Child" button a child is added. Its name is the name of the selected node followed with ".n" where n is the number of the child. This is a dynamic tree because its size is not fixed. Its code is as follows:

REM  *****  BASIC  *****
'Listing 14
Option Explicit

Private oDlg as Object, oLbDescription as Object
Private oTreeCtrl as Object, oTreeModel as Object
Private oMutableTreeDataModel  as Object
Private oRootNode as Object, oChildNode as Object, ogNode as Object


Sub mainTree '[Simple example: collapsing and expanding folders]
   DialogLibraries.loadLibrary("Standard")
   
   oDlg = CreateUnoDialog(DialogLibraries.Standard.SimpleTreeDialog)
   If IsNull(oDlg) Then Exit Sub
      
   oTreeCtrl = oDlg.getControl("TreeControl1")
   oTreeModel = oTreeCtrl.Model   
   
   oMutableTreeDataModel = createUnoService(_
         "com.sun.star.awt.tree.MutableTreeDataModel")
   
   oRootNode = oMutableTreeDataModel.createNode( "Root", true )  
   
   oMutableTreeDataModel.setRoot(oRootNode)

   Dim oChildNode1
   oChildNode1 = oMutableTreeDataModel.createNode( "Parent 1", true )
   oRootNode.appendChild(oChildNode1)   
      'Create this child's own children      
            'In two steps:
            Dim oSubChildNode
            oSubChildNode = oMutableTreeDataModel.createNode(_
               "Child 1", true )
            oChildNode1.appendChild(oSubChildNode)
                  'In only one:
                  'Go deeper in the hierarchical structure
                  oSubChildNode.appendChild( _
                     oMutableTreeDataModel.createNode( _
                        "Grandson 1", false ) )
                  oSubChildNode.appendChild( _
                     oMutableTreeDataModel.createNode( _
                        "Grandson 2", false ) )
            
            'In only one:
            oChildNode1.appendChild( oMutableTreeDataModel.createNode( _
                                 "Child 2", true ) )
   
   Dim oChildNode2
   oChildNode2 = oMutableTreeDataModel.createNode( "Parent 2", true )
   oRootNode.appendChild(oChildNode2)
   
   Dim oChildNode3
   oChildNode3 = oMutableTreeDataModel.createNode( "Parent 3", FALSE )
   oRootNode.appendChild(oChildNode3)
   
   Dim oChildNode4
   oChildNode4 = oMutableTreeDataModel.createNode( "Parent 4", true )
   oRootNode.appendChild(oChildNode4)
   
   Dim oChildNode5
   oChildNode5 = oMutableTreeDataModel.createNode( "Parent 5", true )
   oRootNode.appendChild(oChildNode5)
   
   Dim oChildNode6
   oChildNode6 = oMutableTreeDataModel.createNode( "Parent 6", FALSE )
   oRootNode.appendChild(oChildNode6)
      Dim bHasChildernOnDemand as Boolean
      Dim aChild : aChild = oMutableTreeDataModel.createNode( "Grandson", FALSE )
      oChildNode6.appendChild(aChild)
      
   oTreeModel.DataModel = oMutableTreeDataModel
   
   oDlg.execute()
   oDlg.dispose()
End Sub

Sub addChild(Event As Object)
  Dim oParentNode, oChildNode
  Dim nb as long
  Dim oChildName as String
  oParentNode = oTreeCtrl.getSelection()
  nb = oParentNode.getChildCount()
  nb=nb+1 'I want numerotation begins with 1
  oChildName = oParentNode.getDisplayValue() + "." + nb
  oChildNode = oMutableTreeDataModel.createNode(oChildName , TRUE )
  oParentNode.appendChild(oChildNode)
  oLbDescription = oDlg.getControl("lbDescription")
  oLbDescription.setText(oChildName)
End Sub

The sub "addChild" is bound with the corresponding button. Here is a snapshot of a result:

Dynamic Tree in a Tree Control (OOoBasic)

Question : what is the last created node ? Answer see the Text control : "Root.7.1.2".

Let's turn to the corresponding C++ example.

Dynamic Trees in C++

I start from the previous tree (C++) with the same functioning as in previous section. When a node is selected, "add Child" button creates a child with name nodename.i where i is the number of the child and nodename the name of the node. For debuging intention, I put also the name of the added node in the text control.

Our new constructor

The constructor of previous section is slighty modified. Here is the corresponding code :

// c++
// Listing 15
// added this constructor 06/06/09 
    inline MyCounterImpl( Reference< XComponentContext > const & xContext) throw ()
        : m_xContext( xContext ) {
	m_xMCF=m_xContext->getServiceManager();
//	Reference< XMutableTreeDataModel > xTreeMutDatMod(xTreeControl,UNO_QUERY); //NO NO NO:hangs the office : see below
	Reference< XMutableTreeDataModel > xMutTreeDatMod(m_xMCF->createInstanceWithContext(
			OUString::createFromAscii("com.sun.star.awt.tree.MutableTreeDataModel"),m_xContext),UNO_QUERY_THROW);
	m_xMutTreeDatMod = xMutTreeDatMod;
// If you want to use java Inspector
	Reference< XInstanceInspector > xInspector(m_xMCF->createInstanceWithContext( 
            					OUString( RTL_CONSTASCII_USTRINGPARAM( "org.openoffice.InstanceInspector" ) ),
						m_xContext),
						UNO_QUERY_THROW );
	m_xInspector = xInspector;	
	Reference< XDesktop > xDesktop(
            m_xMCF->createInstanceWithContext( 
            OUString( RTL_CONSTASCII_USTRINGPARAM( "com.sun.star.frame.Desktop" ) ),
            xContext ), UNO_QUERY_THROW );
	Reference< XComponent > xcomponent = xDesktop->getCurrentComponent(); 
	Sequence< Any> Args(1);
	Args[0] <<= xcomponent;
	Reference< XDialogProvider2 > xDialog2(m_xMCF->createInstanceWithArgumentsAndContext( 
            					OUString( RTL_CONSTASCII_USTRINGPARAM( "com.sun.star.awt.DialogProvider2" ) ),
						Args,
						xContext),
						UNO_QUERY_THROW );
//	Reference< XDialogProvider2 > xDialog2(m_xMCF->createInstanceWithContext( 
//            					OUString( RTL_CONSTASCII_USTRINGPARAM( "com.sun.star.awt.DialogProvider2" ) ),
//						xContext),
//						UNO_QUERY_THROW );
	Reference< XDialog > xDialog=xDialog2->createDialogWithHandler(
		OUString::createFromAscii( "vnd.sun.star.script:Standard.SimpleTreeDialog?location=application" ),
		(XCountable *)this);
// Constructing the Tree 21th Jul 2009 (dynamic Tree)
	Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl = xControlContainer->getControl(OUString::createFromAscii("TreeControl"));

	Any any;
	any <<= OUString::createFromAscii("root");
	Reference< XMutableTreeNode > xMTN=m_xMutTreeDatMod->createNode(any,sal_True);
	m_xMutTreeDatMod->setRoot(xMTN);
	any <<= OUString::createFromAscii("Parent 1");
	Reference< XMutableTreeNode > xChildNode = m_xMutTreeDatMod->createNode(any,sal_True);
	xMTN->appendChild(xChildNode);
		any <<= OUString::createFromAscii("Child 1");
		Reference< XMutableTreeNode > xChildNode2 = m_xMutTreeDatMod->createNode(any,sal_True);
		xChildNode->appendChild(xChildNode2);
			any <<= OUString::createFromAscii("Grandson 1");
			Reference< XMutableTreeNode > xChildNode3 = m_xMutTreeDatMod->createNode(any,sal_False);
			xChildNode2->appendChild(xChildNode3);
			any <<= OUString::createFromAscii("Grandson 2");
			xChildNode3 = m_xMutTreeDatMod->createNode(any,sal_False);
			xChildNode2->appendChild(xChildNode3);
		any <<= OUString::createFromAscii("Child 2");
		xChildNode2 = m_xMutTreeDatMod->createNode(any,sal_True);
		xChildNode->appendChild(xChildNode2);
	any <<=  OUString::createFromAscii("Parent 2");
	xChildNode=m_xMutTreeDatMod->createNode(any,sal_True);
	xMTN->appendChild(xChildNode);
// set the model to see the tree in control (two hours to find four lines below)
// translation of oTreeModel = oTreeCtrl.Model and oTreeModel.DataModel = oMutableTreeDataModel
        Reference< XControlModel > xControlModel=xControl->getModel();
	Reference< XPropertySet > xPropertySet( xControlModel,UNO_QUERY);
	any <<= m_xMutTreeDatMod;
	xPropertySet->setPropertyValue(OUString::createFromAscii("DataModel"),any);
// execute dialog
	xDialog->execute();
	}
// end of constructor

The new callHandlerMethod

As you can see in the code below only "addChild" method is used in this example:

// C++
// Listing 16
// XDialogEventHandler implementation
sal_Bool SAL_CALL MyCounterImpl::callHandlerMethod(const Reference< XDialog >& xDialog,const Any& EventObject,const OUString & MethodName ) throw(WrappedTargetException, RuntimeException ){
  if (MethodName.equalsAscii("LosingFocus")){//When Losing Focus in Tree control
	// not used in this example
	return sal_True;
  }
  if (MethodName.equalsAscii("addChild")){//add a child to the selected node
// First retrieve the selection
        Reference< XControlContainer > xControlContainer(xDialog,UNO_QUERY);
	Reference< XControl > xControl = xControlContainer->getControl(OUString::createFromAscii("TreeControl"));	
	// com.sun.star.awt.tree.XTreeControl
        Reference< XTreeControl > xTreeControl(xControl,UNO_QUERY);
	Any any=xTreeControl->getSelection();
	// Parent
	Reference< XMutableTreeNode > xParentNode;
	any >>= xParentNode;	
// adding
	sal_Int32 nb=xParentNode->getChildCount();
	// Child
	OUString OUStr;

	any=xParentNode->getDisplayValue();
	any >>= OUStr;
	OUStr = OUStr + OUString::createFromAscii(".") + OUString::valueOf((sal_Int32)++nb);
// put the new node name in text control
	xControl = xControlContainer->getControl(OUString::createFromAscii("lbDescription"));
        Reference< XTextComponent > xTextComponent(xControl,UNO_QUERY);
	xTextComponent->setText(OUStr);
	any <<= OUStr;
	Reference< XMutableTreeNode > xChildMutTreeNode = m_xMutTreeDatMod->createNode(any ,sal_True);
// Introspection
//	any <<= xChildMutTreeNode;
//	m_xInspector->inspect(any,OUString::createFromAscii("Inspector"));        
	xParentNode->appendChild(xChildMutTreeNode);
	return sal_True;
  }
  return sal_False;
}
Sequence< OUString > SAL_CALL MyCounterImpl::getSupportedMethodNames() throw (RuntimeException){
  Sequence< OUString > SeqOUStr(2);
  SeqOUStr[0]=OUString::createFromAscii("LosingFocus");
  SeqOUStr[1]=OUString::createFromAscii("addChild");
  return SeqOUStr;
}

Here is a snapshot

Dynamic Tree in a Tree Control

where you can see all the nodes added.

See The Cpp Inspector to see an application of a dynamic Tree in a dialog.

General Remark

In this chapter I always use the component constructor to print out the dialog. I am not sure it's a good choice for professional components. I plan to write a chapter on writing professional components but it would be better with a lot of practice that I haven't at the moment.

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