XAML - RichEditBox

A RichEditBox is a rich text editing control that supports formatted text, hyperlinks, and other rich content. WPF projects do not support this control. So it will be implemented in Windows App. The hierarchical inheritance of RichEditBox class is as follows −

Properties

Events

Methods

Example

The following example shows how to open and save an RTF file in RichEditBox. Here is the XAML code to create and initialize two buttons and a RichEditBox with some properties and events.

<Page x:Class = "XAMLRichEditBox.MainPage" 
   xmlns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
   xmlns:x = "http://schemas.microsoft.com/winfx/2006/xaml" 
   xmlns:local = "using:XAMLRichEditBox" 
   xmlns:d = "http://schemas.microsoft.com/expression/blend/2008" 
   xmlns:mc = "http://schemas.openxmlformats.org/markup-compatibility/2006"
   mc:Ignorable = "d">
	
   <Grid Background = "{ThemeResource ApplicationPageBackgroundThemeBrush}"> 
      <Grid Margin = "120">
         <Grid.RowDefinitions> 
            <RowDefinition Height="50"/> 
            <RowDefinition/> 
         </Grid.RowDefinitions>
			
         <StackPanel Orientation = "Horizontal"> 
            <Button Content = "Open file" Click = "OpenButton_Click"/> 
            <Button Content = "Save file" Click = "SaveButton_Click"/> 
         </StackPanel>
			
         <RichEditBox x:Name = "editor" Grid.Row = "1"/> 
      </Grid>
   </Grid>
   
</Page>

Here is the implementation in C# for different events and file handling −

using System; 
using System.Collections.Generic; 
using System.IO; using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime; 

using Windows.Foundation; 
using Windows.Foundation.Collections;

using Windows.Storage; 
using Windows.Storage.Pickers; 
using Windows.Storage.Provider; 

using Windows.UI.ViewManagement; 
using Windows.UI.Xaml; 
using Windows.UI.Xaml.Controls; 
using Windows.UI.Xaml.Controls.Primitives; 
using Windows.UI.Xaml.Data; 
using Windows.UI.Xaml.Input; 
using Windows.UI.Xaml.Media; 
using Windows.UI.Xaml.Navigation;

// The Blank Page item template is documented at
http://go.microsoft.com/fwlink/?LinkId=234238

namespace XAMLRichEditBox {
   /// <summary> 
      /// An empty page that can be used on its own or navigated to within a Frame.
   /// </summary>
	
   public sealed partial class MainPage : Page {
      public MainPage() { 
         this.InitializeComponent(); 
      } 
      private async void OpenButton_Click(object sender, RoutedEventArgs e) {
         // Open a text file. 
         Windows.Storage.Pickers.FileOpenPicker open = new 
            Windows.Storage.Pickers.FileOpenPicker();
         open.SuggestedStartLocation = 
            Windows.Storage.Pickers.PickerLocationId.DocumentsLibrary;
         open.FileTypeFilter.Add(".rtf");
         Windows.Storage.StorageFile file = await open.PickSingleFileAsync();

         if (file != null) { 
            Windows.Storage.Streams.IRandomAccessStream randAccStream = await 
               file.OpenAsync(Windows.Storage.FileAccessMode.Read);

            // Load the file into the Document property of the RichEditBox.
            editor.Document.LoadFromStream(Windows.UI.Text.TextSetOptions.FormatRtf, randAccStream); 
         }
      }
      private async void SaveButton_Click(object sender, RoutedEventArgs e) {
         if (((ApplicationView.Value != ApplicationViewState.Snapped) || 
            ApplicationView.TryUnsnap())) { 
            
            FileSavePicker savePicker = new FileSavePicker(); 
            savePicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
						
            // Dropdown of file types the user can save the file as
            savePicker.FileTypeChoices.Add("Rich Text", new List <string>() { ".rtf" });
							
            // Default file name if the user does not type one in or select a file to replace
            savePicker.SuggestedFileName = "New Document";
							
            StorageFile file = await savePicker.PickSaveFileAsync();
						
            if (file != null) { 
               // Prevent updates to the remote version of the file until we 
               //finish making changes and call 
               CompleteUpdatesAsync. CachedFileManager.DeferUpdates(file);

               // write to file
               Windows.Storage.Streams.IRandomAccessStream randAccStream = await 
                  file.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite);
							
               editor.Document.SaveToStream(Windows.UI.Text.TextGetOptions.FormatRtf, randAccStream);

               // Let Windows know that we're finished changing the file so the 
               // other app can update the remote version of the file.
								
               FileUpdateStatus status = await CachedFileManager.CompleteUpdatesAsync(file);
								
               if (status != FileUpdateStatus.Complete) { 
                  Windows.UI.Popups.MessageDialog
                     errorBox = new Windows.UI.Popups.MessageDialog(
                     "File " + file.Name + " couldn't be saved."); 
                  
                  await errorBox.ShowAsync(); 
               } 
            }
         } 
      } 
   } 
}

When you compile and execute the above code, it will produce the following output. You can open, edit, and save any RTF file in this application.

We recommend you to execute the above example code and experiment with some other properties and events.

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