20: Add-ins in VS .NET

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in Listing 2010 Similar to the event handler for the copy button, this method rst gets the current document and then nds the root node However, before pasting, we check to make sure that the namespace URI of the root node of the current document matches that of the copied node If the namespaces don t match, we show an error message and prevent the paste from occurring (We re assuming that if the namespace URIs match, the schema for each of the nodes is the same You may want to do a more robust check to ensure that they are the same beyond a reasonable doubt)
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Listing 2010: Paste Button Event Handler
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public void OnPasteClick(CommandBarButton Ctrl, ref bool CancelDefault) { XDocument document = _applicationObjectActiveWindowXDocument; IXMLDOMNode targetRootNode = documentDOMselectSingleNode( "*[not(self::processing-instruction())]"); if (targetRootNodenamespaceURI == _copiedNodenamespaceURI) { documentViewDisableAutoUpdate(); targetRootNodeownerDocumentreplaceChild( _copiedNode, targetRootNode); documentViewEnableAutoUpdate(); } else { MessageBoxShow( "You cannot paste into this document The " + "namespace of the target document does not match " + "that of the source document"); } }
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If the namespace URIs match, the root node of the current document is replaced with the copied node by calling the replaceChild method on the owner document of the root node in the current form That s it Once you compile the code, you now have a fully functional COM add-in that will allow you to easily copy data from one InfoPath form to another
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Custom Task Pane s
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In addition to the ability to host COM add-ins, InfoPath 2007 introduces support for a new feature available in other Microsoft Of ce 2007 applications Custom Task Panes You re already familiar with task panes in InfoPath, so you can probably guess that Custom Task Panes are those you can create yourself and add into certain Microsoft Of ce applications such as Access, Excel, InfoPath, Outlook, PowerPoint, and Word in order to add your own behavior to these applications Custom Task Panes are built as a combination of a COM add-in and an ActiveX control, so you can add just about any behavior you want You may be wondering why you need support for this new Custom Task Pane technology when InfoPath already includes support for custom task panes implemented with HTML and script The new Custom Task Pane technology has three main advantages over the existing HTML task panes in InfoPath 1 Custom Task Panes can be shared among multiple Microsoft Of ce applications This allows you to create a consistent user experience across a wide range of applications 2 HTML task panes live with the form template, while Custom Task Panes are installed on the user s machine This allows you to add functionality to forms one time without having to add your task pane to each and every form template 3 Since Custom Task Panes are installed on your users machines, they have full access to the entire InfoPath OM, whether or not the form template has a security level of full trust HTML task panes, on the other hand, can access the full-trust object model only if the form template is installed or digitally signed
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Creating a Custom Task Pane Now that you see the advantages of Custom Task Panes, let s look at how to create one Since you already know a bit about COM add-ins, creating a Custom Task Pane should be relatively easy Let s create a Custom Task Pane that will allow us to view the XML data in a form We ll call this pane the Form Data View pane To open our Form
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20: Add-ins
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Data View pane, we ll create a COM add-in that creates a toolbar and two buttons one to show the Custom Task Pane and one to refresh the XML data shown in the task pane As we mentioned, Custom Task Panes are implemented by using a combination of a COM add-in and an ActiveX control The COM add-in is the driver of the task pane As you ll see, it is through the COM add-in that the task pane is created, displayed, and so on To get started, the rst thing you must do is follow the rst part of this chapter and create a COM add-in in Visual Studio Of course, this time around, you ll want to give it a different name In this case, let s name our project FormDataTaskPane and name our add-in FormDataTaskPaneAddIn (This sample, called FormDataTaskPane, is available with the other samples for this chapter) The process of creating this add-in is exactly the same as we explained earlier You ll want to implement OnConnection to set up the necessary event sinks, OnStartupComplete to create and initialize the toolbar and the two buttons we talked about, and OnSwitchView to enable the buttons when a form is loaded Figure 204 shows how our toolbar and Custom Task
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