Question

Is there a marker bar component for a C# application what i could use in my application? As marker bar i mean something like ReSharper adds to Visual Studio:

Another example for something similar (the bar on the left):

EDIT: I found non-free component for java http://www.sideofsoftware.com/marker_bar/doc/sos/marker/JMarkerBar.html what does exactly what i want to do. It doesnt suite for me but maybe it helps someone.

Answer 1

In WPF the bar is a bit like a ListBox with just a different way of displaying a 1 pixel high line for each line of text. The state of the line would influence the color of the line and selecting a line would raise the SelectionChanged event to which the textbox could respond.

Let me know if you want me to show a prototype.

EDIT

Here goes. You can click/select a line in the bar and the textbox will scroll to that line.

Still to add:

1. what to do when the number of lines is to large for the bar?

2. A different way to show the line that is current in the bar?

3. Keep the selected line in the bar in sync with the caret in the text box.

4. …

These can be solved but depend largely on what you want. This should get you started.

XAML:

<Window x:Class="WpfApplication2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WpfApplication2"
        Title="MainWindow"
        Height="350"
        Width="525">
    <Window.Resources>
        <local:StatusToBrushConverter x:Key="statusToBrushConverter" />
    </Window.Resources>
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="30" />
            <ColumnDefinition />
        </Grid.ColumnDefinitions>
        <ListBox ItemsSource="{Binding}"
                 SelectionChanged="ListBox_SelectionChanged">
            <ListBox.ItemContainerStyle>
                <Style TargetType="ListBoxItem">
                    <Setter Property="HorizontalContentAlignment"
                            Value="Stretch" />
                    <Setter Property="Opacity"
                            Value="0.5" />
                    <Setter Property="MaxHeight"
                            Value="1" />
                    <Setter Property="MinHeight"
                            Value="1" />
                    <Style.Triggers>
                        <Trigger Property="IsSelected"
                                 Value="True">
                            <Trigger.Setters>
                                <Setter Property="Opacity"
                                        Value="1.0" />
                            </Trigger.Setters>
                        </Trigger>
                    </Style.Triggers>
                </Style>

            </ListBox.ItemContainerStyle>
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <Rectangle StrokeThickness="0"
                               Stroke="Green"
                               Fill="{Binding Status, Converter={StaticResource statusToBrushConverter}}"
                               Height="1"
                               HorizontalAlignment="Stretch" />
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
        <TextBox AcceptsReturn="True"
                 Grid.Column="1"
                 x:Name="codeBox" />
    </Grid>
</Window>

C#:

using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Windows;
using System.Windows.Controls;

namespace WpfApplication2
{
    public partial class MainWindow : Window
    {
        private CodeLines lines;

        public MainWindow()
        {
            InitializeComponent();

            lines = new CodeLines();

            Random random = new Random();
            for (int i = 0; i < 200; i++)
            {
                lines.Add(new CodeLine { Status = (VersionStatus)random.Next(0, 5), Line = "Line " + i });
            }

            this.DataContext = lines;

            codeBox.Text = String.Join("\n",  from line in lines
                                            select line.Line);
        }

        private void ListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var selectedLine = ((ListBox)sender).SelectedIndex;
            codeBox.ScrollToLine(selectedLine);
        }
    }

    public enum VersionStatus
    {
        Original,
        Added,
        Modified,
        Deleted
    }

    public class CodeLine : INotifyPropertyChanged
    {

        private VersionStatus status;

        public VersionStatus Status
        {
            get { return status; }
            set
            {
                if (status != value)
                {
                    status = value;
                    OnPropertyChanged("Status");
                }
            }
        }

        private string line;

        public string Line
        {
            get { return line; }
            set
            {
                if (line != value)
                {
                    line = value;
                    OnPropertyChanged("Line");
                }
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        protected void OnPropertyChanged(string propertyName)
        {
            var p = PropertyChanged;
            if (p != null)
            {
                p(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }

    public class CodeLines : ObservableCollection<CodeLine>
    {
    }


    class StatusToBrushConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            var status = (VersionStatus)value;
            switch (status)
            {
                case VersionStatus.Original:
                    return Brushes.Green;
                case VersionStatus.Added:
                    return Brushes.Blue;
                case VersionStatus.Modified:
                    return Brushes.Yellow;
                case VersionStatus.Deleted:
                    return Brushes.Red;
                default:
                    return DependencyProperty.UnsetValue;
            }
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}