Adding changes

Author: Nandhakumar-SF4686

Styles/StylingToolbarItem/README.md

@@ -164,7 +164,6 @@ This namespace enables access to the PDF Viewer control.
     pdfViewer.DocumentSource = DocumentStream;
 ```
 
-
 ### 9. Matching semantics of the custom toolbar item with default toolbar item
 
 To match the text color of newly added toolbar item with that of default toolbar item in the toolbar, set the color of the [TextColor](https://learn.microsoft.com/en-us/dotnet/api/microsoft.maui.controls.button.textcolor?view=net-maui-9.0) for the button as that of the default toolbar item using the [SetAppThemeColor](https://learn.microsoft.com/en-us/dotnet/api/microsoft.maui.controls.bindableobjectextensions.setappthemecolor?view=net-maui-9.0) method. Refer to the below code example.
@@ -181,8 +180,6 @@ To match the text color of newly added toolbar item with that of default toolbar
         BackgroundColor = Colors.Transparent, // Set background for the button
         BorderColor = Colors.Transparent, // Set border color for the button
         CornerRadius = 5, // Set corner radius of the button
-        Opacity = 1,
-        IsEnabled = true
     };
 
     //Set color based on theme.

Styles/StylingToolbarItem/View/PDFViewerPage.xaml.cs

@@ -15,34 +15,47 @@ public PDFViewerPage()
         // Assigning stream to "DocumentSource" property.
         PdfViewer.DocumentSource = documentStream;
 
-        // Calling "AddFileOperationsToolbarItems" for to add save and open options toolbar item in toolbar
+        // Calling "AddFileOperationsToolbarItems" for to add save and open options toolbar item in toolbar.
         AddFileOperationsToolbarItem();
+
+        // Wiring "DocumentLoaded" event to enable the button. 
+        PdfViewer.DocumentLoaded += PdfViewer_DocumentLoaded;
+    }
+
+    private void PdfViewer_DocumentLoaded(object? sender, EventArgs? e)
+    {
+        if (fileOpenButton != null)
+        {
+            // Enable the fileOpenButton to allow user interaction.
+            fileOpenButton.IsEnabled = true;
+            fileOpenButton.Opacity = 1; // Set the opacity of the button.
+        }
     }
 
     void AddFileOperationsToolbarItem()
     {
-        // Create new open button
+        // Create new open button.
         fileOpenButton = new Button
         {
-            Text = "\ue712", // Set button text
-            FontSize = 24, // Set button text font size
-            FontFamily = "MauiMaterialAssets", // Set button text font family
-            BackgroundColor = Colors.Transparent, // Set background for the button
-            BorderColor = Colors.Transparent, // Set border color for the button
-            CornerRadius = 5, // Set corner radius of the button
-            Opacity = 1,
-            IsEnabled = true
+            Text = "\ue712", // Set button text.
+            FontSize = 24, // Set button text font size.
+            FontFamily = "MauiMaterialAssets", // Set button text font family.
+            BackgroundColor = Colors.Transparent, // Set background for the button.
+            BorderColor = Colors.Transparent, // Set border color for the button.
+            CornerRadius = 5, // Set corner radius of the button.
+            Opacity = 0.5, // Set opacity of the button.
+            IsEnabled = false, // Disable the button.
         };
 
-        //Subscription of click event for the open file button
+        //Subscription of click event for the open file button.
         fileOpenButton.Clicked += FileOpenButton_Clicked;
 
         //Set color based on theme.
         fileOpenButton.SetAppThemeColor(Button.TextColorProperty,
         Color.FromArgb("#49454F"),
         Color.FromArgb("#CAC4D0"));
 
-        // Set the tooltip text on hover
+        // Set the tooltip text.
         ToolTipProperties.SetText(fileOpenButton, "OpenFile");
 
 #if !WINDOWS && !MACCATALYST