WPF RichTextBox SelectionChanged

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C#

.NET

WPF

C#4.0

.NET4.5

, +

Hi, I need to make a basic Text Editor. This is what I have so far. Now I don't know how to handle RichTextBox_SelectionChanged. Thanks for advices.

<Window x:Class="MyWpfTextEditor.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <RichTextBox x:Name="rtBox" HorizontalAlignment="Left" Height="264" Margin="10,45,0,0" VerticalAlignment="Top" Width="323" Loaded="rtBox_Loaded" SelectionChanged="rtBox_SelectionChanged"/>
        <ComboBox x:Name="fontSizeComBox" SelectedIndex="4" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Width="50" Loaded="fontSizeComBox_Loaded" SelectionChanged="fontSizeComBox_SelectionChanged"/>
        <ComboBox x:Name="fontNameComBox" SelectedIndex="9" HorizontalAlignment="Left" Margin="65,10,0,0" VerticalAlignment="Top" Width="230" SelectionChanged="fontNameComBox_SelectionChanged" Loaded="fontNameComBox_Loaded"/>
        <ToggleButton x:Name="boldToggButt" Content="B" FontWeight="Bold" Width="22" Height="22" Margin="300,10,192,287" Checked="boldToggButt_Checked" Unchecked="boldToggButt_Unchecked" />
        <ToggleButton x:Name="italicToggButt" Content="I" FontStyle="Italic" Width="22" Height="22" Margin="328,10,167,287" Checked="italicToggButt_Checked" Unchecked="italicToggButt_Unchecked"/>
        <ToggleButton x:Name="underToggButt" Width="22" Height="22" Margin="355,10,140,287" Checked="underToggButt_Checked" Unchecked="underToggButt_Unchecked">
            <ToggleButton.Content>
                <TextBlock>
                    <Underline>U</Underline>
                </TextBlock>
            </ToggleButton.Content>
        </ToggleButton>

    </Grid>
</Window>

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace MyWpfTextEditor
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        //FontSize
        private void fontSizeComBox_Loaded(object sender, RoutedEventArgs e)
        {  
            fontSizeComBox.ItemsSource = new List<double>() { 8, 9, 10, 11, 12, 14, 16, 18, 20, 22, 24, 26, 28, 36, 48, 72 };
        }

        private void fontSizeComBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (rtBox.Selection.IsEmpty)
            {
                var r = new Run() { FontSize = (double)fontSizeComBox.SelectedValue };
                (rtBox.Document.Blocks.FirstBlock as Paragraph).Inlines.Add(r);
                rtBox.CaretPosition = r.ElementStart;
            }
            else
            {
                rtBox.Selection.ApplyPropertyValue(Inline.FontSizeProperty, fontSizeComBox.SelectedValue);
            }
            rtBox.Focus();
        }

        //FontFamily
        private void fontNameComBox_Loaded(object sender, RoutedEventArgs e)
        {
            fontNameComBox.ItemsSource = Fonts.SystemFontFamilies.OrderBy(f => f.Source);
        }

        private void fontNameComBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (rtBox.Selection.IsEmpty)
            {
                var r = new Run() { FontFamily = (FontFamily)fontNameComBox.SelectedItem };
                (rtBox.Document.Blocks.FirstBlock as Paragraph).Inlines.Add(r);
                rtBox.CaretPosition = r.ElementStart;
            }
            else
            {
                rtBox.Selection.ApplyPropertyValue(Inline.FontFamilyProperty, fontNameComBox.SelectedItem);
            }
            rtBox.Focus();
        }

        //Bold Button
        private void boldToggButt_Checked(object sender, RoutedEventArgs e)
        {
            if (rtBox.Selection.IsEmpty)
            {
                var r = new Bold() { FontWeight = (FontWeight)FontWeights.Bold };
                (rtBox.Document.Blocks.FirstBlock as Paragraph).Inlines.Add(r);
                rtBox.CaretPosition = r.ElementStart;
            }
            else
            {
                rtBox.Selection.ApplyPropertyValue(Inline.FontWeightProperty, FontWeights.Bold);
            }
            rtBox.Focus();
        }

        private void boldToggButt_Unchecked(object sender, RoutedEventArgs e)
        {
            if (rtBox.Selection.IsEmpty)
            {
                var r = new Bold() { FontWeight = (FontWeight)FontWeights.Normal };
                (rtBox.Document.Blocks.FirstBlock as Paragraph).Inlines.Add(r);
                rtBox.CaretPosition = r.ElementStart;
            }
            else
            {
                rtBox.Selection.ApplyPropertyValue(Inline.FontWeightProperty, FontWeights.Normal);
            }
            rtBox.Focus();
        }

        //Italic Button
        private void italicToggButt_Checked(object sender, RoutedEventArgs e)
        {
            if (rtBox.Selection.IsEmpty)
            {
                var r = new Italic() { FontStyle = (FontStyle)FontStyles.Italic };
                (rtBox.Document.Blocks.FirstBlock as Paragraph).Inlines.Add(r);
                rtBox.CaretPosition = r.ElementStart;
            }
            else
            {
                rtBox.Selection.ApplyPropertyValue(Inline.FontStyleProperty, FontStyles.Italic);
            }
            rtBox.Focus();
        }

        private void italicToggButt_Unchecked(object sender, RoutedEventArgs e)
        {
            if (rtBox.Selection.IsEmpty)
            {
                var r = new Italic() { FontStyle = (FontStyle)FontStyles.Normal };
                (rtBox.Document.Blocks.FirstBlock as Paragraph).Inlines.Add(r);
                rtBox.CaretPosition = r.ElementStart;
            }
            else
            {
                rtBox.Selection.ApplyPropertyValue(Inline.FontStyleProperty, FontStyles.Normal);
            }
            rtBox.Focus();
        }

        //Underline Button
        private void underToggButt_Checked(object sender, RoutedEventArgs e)
        {
            if (rtBox.Selection.IsEmpty)
            {
                var r = new Underline() { TextDecorations = (TextDecorationCollection)TextDecorations.Underline };
                (rtBox.Document.Blocks.FirstBlock as Paragraph).Inlines.Add(r);
                rtBox.CaretPosition = r.ElementStart;
            }
            else
            {
                rtBox.Selection.ApplyPropertyValue(Inline.TextDecorationsProperty, TextDecorations.Underline);
            }
            rtBox.Focus();
        }

        private void underToggButt_Unchecked(object sender, RoutedEventArgs e)
        {
            if (rtBox.Selection.IsEmpty)
            {
                var r = new Underline() { TextDecorations = (TextDecorationCollection)null };
                (rtBox.Document.Blocks.FirstBlock as Paragraph).Inlines.Add(r);
                rtBox.CaretPosition = r.ElementStart;
            }
            else
            {
                rtBox.Selection.ApplyPropertyValue(Inline.TextDecorationsProperty, null);
            }
            rtBox.Focus();
        }

        //RichTextBox
        private void rtBox_Loaded(object sender, RoutedEventArgs e)
        {
            rtBox.AcceptsTab = true;
            rtBox.AcceptsReturn = true;
            rtBox.VerticalScrollBarVisibility = ScrollBarVisibility.Visible;
        }

        private void rtBox_SelectionChanged(object sender, RoutedEventArgs e)
        {

        }
    }
}