window selection change event is not firing in word vsto add-in C#

Question

Hi,

could anyone suggest me how to call the style change/click event to fire. This is my sample code.

<?xml version="1.0" encoding="UTF-8"?>
<customUI onLoad="Ribbon_Load">
   <ribbon>
       <tabs>
           <tab idMso="TabAddIns">
               <group id="ContentGroup" label="Content">
                   <button id="textButton" label="Draft assist panel"
                       screentip="Text" onAction="OnTextButton"
                       supertip="click on to open the next drafting style panel"/>

               </group>
           </tab>
       </tabs>
   </ribbon>
</customUI>

In Ribbon1.cs(Ribbon visual designer)

Creating own style and creating a new paragraph when click/change on the custom style but the selection event is not firing. Here is the my sampke code.

public void OnTextButton(Office.IRibbonControl control)
{
string[] array_StyleRules = null;
array_StyleRules = getStyleRules("");

Microsoft.Office.Interop.Word.Application wordApp = Globals.ThisAddIn.Application;
Microsoft.Office.Interop.Word.Document doc = wordApp.ActiveDocument;

Microsoft.Office.Interop.Word.Style newStyle;

// Create a new custom style
foreach (string arr_style in array_StyleRules)
{
newStyle = doc.Styles.Add(arr_style, Microsoft.Office.Interop.Word.WdStyleType.wdStyleTypeCharacter);
newStyle.Font.Bold = 1;
newStyle.Font.Italic = 1;
// Apply the custom style to selected text (for example)
if (wordApp.Selection != null && !string.IsNullOrEmpty(wordApp.Selection.Text))
{
wordApp.Selection.set_Style(arr_style);
}
}

}

The below Ribbon.cs event is not firing when change the custom style. could anyone please help me how and where I need to call style change event

private void ThisAddIn_Startup(object sender, System.EventArgs e)
{
Globals.ThisAddIn.Application.WindowSelectionChange +=
new ApplicationEvents4_WindowSelectionChangeEventHandler(Application_WindowSelectionChange);

}

private void Application_WindowSelectionChange(Word.Selection Sel)
{
if (Sel != null)
{
InsertNewParagraph(Sel);
}
}
private void InsertNewParagraph(Selection selection)
{
Microsoft.Office.Interop.Word.Application wordApp = Globals.ThisAddIn.Application;
Microsoft.Office.Interop.Word.Document doc = wordApp.ActiveDocument;

// Insert a new paragraph at the current selection
Paragraph newParagraph = wordApp.ActiveDocument.Content.Paragraphs.Add();// selection.Paragraphs.Add();
newParagraph.Range.Text = "This is a new paragraph.";
newParagraph.Range.set_Style(selection);
newParagraph.Range.InsertParagraphAfter();
}

Eliana Blake · Answer

Thank you for providing detailed information on the issue you are facing with the window selection change event in your Word VSTO add-in. Let's delve into this matter: From the code snippets you shared, it seems like you are trying to create a new custom style and then apply that style to selected text. However, you are encountering an issue where the window selection change event is not firing as expected when changing the custom style. One key aspect to note is that the `WindowSelectionChange` event is triggered when the selection in the Word document changes. In your case, you are looking to capture this event when a custom style is applied. Here are some suggestions to troubleshoot and potentially resolve this issue: 1. Verify Event Subscription : Ensure that the event subscription is correctly set up in your `ThisAddIn_Startup` method. Double-check that the event handler is properly registered with the `WindowSelectionChange` event. 2. Check Selection Change Triggers : As the `WindowSelectionChange` event is not directly tied to style changes, you may need to consider alternative approaches to detect style changes. For instance, you could monitor changes in the style of the selected text directly or utilize other events related to document content modifications. 3. Alternative Event Handling : If the `WindowSelectionChange` event does not cater to your specific requirement, you might explore other events or approaches within the Word object model that can capture style changes or content modifications more effectively. 4. Testing and Debugging : Implement debugging techniques to track the flow of your code and identify where the issue might lie. It can help to step through the code and observe the behavior to pinpoint the exact moment when the event is not firing as expected. Additionally, it may be beneficial to dive deeper into the Word VSTO documentation or seek insights from the Microsoft Developer Network (MSDN) community forums to get further assistance on handling style change events within Word VSTO add-ins. Do you require further clarification on any of these points, or do you have additional details to share that could shed more light on the issue at hand? Your contributions and feedback are crucial in tailoring the solution to your specific scenario.