Figure 204: Form Data View task pane in .NET framework

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Figure 204: Form Data View task pane
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Pane look after we re nished As you can see, the Form Data View task pane shows the XML structure of the form as well as the data entered by the user As we mentioned, the implementation of the FormDataTaskPane COM add-in is pretty much the same as the FormUtilities add-in we implemented earlier However, to tell InfoPath that our COM add-in is the driver for a Custom Task Pane, we must implement a new interface ICustomTaskPaneConsumer This interface includes one method CTPFactoryAvailable which is called after OnConnection but before OnStartupComplete Our implementation of this method, which is shown in Listing 2011, receives an ICTPFactory object This object, as its name implies, is the Custom Task Pane factory object It contains one method CreateCTP which can be used to create as many Custom Task Panes as you like
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Listing 2011: CTPFactoryAvailable Method
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public void CTPFactoryAvailable(ICTPFactory CTPFactoryInst) { _ctpFactory = CTPFactoryInst; }
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As you can see in Listing 2011, we are storing a reference to the Custom Task Pane factory object in a member variable When the user presses the button to show the task pane, at that point we will create the task pane using the _ctpFactory object Of course, once the task pane is created, we ll want to show it The code for the button click event handler, which is called OnToggleClick since we are toggling the visibility of the task pane, is shown in Listing 2012 The code in OnToggleClick is doing quite a bit of work, so let s look at it in detail First, notice that we are getting the hash code of the window and using it as a key into a collection of task panes stored in a member variable called _taskPanes This member variable is just a ListDictionary type that holds a collection of CustomTaskPane objects pertaining to all the task panes we ve created You may be wondering why we have to do this instead of just storing the created task pane as a member variable The reason is simple Remember that there is one instance of a COM add-in per application However, there can be one or more instances of each task pane you create in each
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Listing 2012: OnToggleClick Event Handler for the Show/Hide Task Pane Button
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private void OnToggleClick(CommandBarButton Ctrl, ref bool CancelDefault) { int hashCode = _applicationObjectActiveWindowGetHashCode(); CustomTaskPane taskPane = (CustomTaskPane)_taskPanes[hashCode]; if (CtrlCaption == "Show Form Data View Pane") { if (taskPane == null) { taskPane = _ctpFactoryCreateCTP( "FormDataTaskPaneActiveXFormDataTPAxCtl", "Form Data View", MissingValue); taskPaneVisibleStateChange += new CustomTaskPaneEvents_VisibleStateChangeEventHandler( taskPane_VisibleStateChange); _taskPanesAdd(hashCode, taskPane); } taskPaneVisible = true; CtrlCaption = "Hide Form Data View Pane"; } else { CommandBarButton refreshButton = GetButton(RefreshButtonTag); taskPaneVisible = false; CtrlCaption = "Show Form Data View Pane"; refreshButtonEnabled = false; } }
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application window For example, if you open two InfoPath windows, you will have only one COM add-in However, if you click the show task pane button on the toolbar for your add-in in each window, you will have two instances of your Custom Task Pane one in each window Once you create a task pane, there is no way to access it from the CommandBars collection as you can for a toolbar or button So, once you create the task pane, you need some way to store a reference to it We chose to do that by adding each instance we create to the _taskPanes collection
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When the show task pane button is clicked, we rst try to retrieve the task pane from the _taskPanes collection Then, if the text of the button is currently set to "Show Form Data View Pane" and the task pane doesn t exist in our collection, we create it and add it to the collection, using the window s hash code as the key into the collection Next, we show the task pane by setting its Visible property to true, and nally, we set the text of the toolbar button to "Hide Form Data View Pane" Likewise, when the button is pressed, if the text of the button is "Hide Form Data View Pane", we hide it and reset the text of the button to "Show Form Data View Pane" Creating the task pane is very straightforward As you can see in Listing 2012, to create the task pane, we call the CreateCTP method on the _ctpFactory member variable The CreateCTP method has three parameters, as shown in Table 203 In Listing 2012 we are passing "FormDataTaskPaneActiveXFormDataTPAxCtl" as the ID of the control This is the ProgID of the ActiveX control that will show the XML tree representation of the form This is a standard ActiveX control that we created with Visual Studio in much the same way we did in the last chapter (However, in this case, our control does not implement the InfoPathControl interface This interface is supported by InfoPath only for ActiveX controls that are in the actual form itself) CreateCTP will return an instance of a CustomTaskPane object if the task pane could be created The task pane creation will fail if the ID of the ActiveX control is not provided or is invalid or if the ActiveX control failed to be created for any reason
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