MainWindow.xaml

<Window x:Class="LogMonitor.MainWindow"
        x:Name="Wnd"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:LogMonitor"
        xmlns:converter="clr-namespace:LogMonitor.Converters"
        xmlns:res="clr-namespace:LogMonitor.Properties"
        Width="{Binding WindowWidth, Mode=TwoWay}"
        Height="{Binding WindowHeight, Mode=TwoWay}" 
        Loaded="MainWindow_OnLoaded"
        Title="{Binding Title}">
    <Window.DataContext>
        <local:MainWindowVm/>
    </Window.DataContext>
    
    <Window.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="Resources/Icons.xaml"/>
                <!--<ResourceDictionary Source="Resources/Scrollbar.xaml"/>-->
            </ResourceDictionary.MergedDictionaries>
            <converter:FilterConverter x:Key="FilterConverter"/>

            <Style x:Key="LevelStyle" TargetType="TextBlock">
                <Setter Property="Background" Value="{Binding Level, Converter={converter:LevelToBrushConverter}}"/>
            </Style>

            <Style x:Key="DateTimeColumnCellStyle" TargetType="DataGridCell">
                <Setter Property="ToolTip" Value="{Binding Converter={converter:DateTimeFormatConverter}}"/>
            </Style>

            <x:Array x:Key="HighlightingColors" Type="SolidColorBrush">
                <SolidColorBrush Color="Transparent"/>
                <SolidColorBrush Color="#FFFFE4"/>
                <SolidColorBrush Color="#FFFFC4"/>
                <SolidColorBrush Color="#FFFFA4"/>
            </x:Array>

            <DataTemplate x:Key="DateTimeColumnHeaderTemplate">
                <DockPanel HorizontalAlignment="Stretch">
                    <CheckBox DockPanel.Dock="Left" x:Name="ShowYearCheckBox" VerticalAlignment="Center" Margin="0 0 5 0"
                              IsChecked="{Binding DataContext.ShowYear, Mode=TwoWay, ElementName=Wnd}"
                              ToolTip="{x:Static res:Resources.Columns_ShowDate}"/>
                    <TextBlock Text="{Binding Content, RelativeSource={RelativeSource Mode=TemplatedParent}}"/>
                </DockPanel>
            </DataTemplate>
        </ResourceDictionary>
    </Window.Resources>
    
    <Grid>
        <DockPanel>
            <DockPanel Dock="Top" Margin="5">
                <Button Command="{Binding RefreshLogCommand}" DockPanel.Dock="Left" Margin="0 0 2 0" 
                        IsEnabled="{Binding IsRun, Converter={StaticResource InversedBooleanConverter}}"
                        Content="{StaticResource RefreshArrow}">
                    <Button.Style>
                        <Style TargetType="Button">
                            <Style.Triggers>
                                <Trigger Property="IsEnabled" Value="False">
                                    <Setter Property="Foreground" Value="Silver"/>
                                </Trigger>
                            </Style.Triggers>
                        </Style>
                    </Button.Style>
                </Button>
                <Button DockPanel.Dock="Right"
                        Width="Auto"
                        Padding="20 0"
                        Content="{x:Static res:Resources.Clear}"
                        Command="{Binding ClearCommand}"/>
                <Button DockPanel.Dock="Right"
                        Width="Auto"
                        Padding="20 0"
                        IsEnabled="{Binding IsRun}"
                        Content="{x:Static res:Resources.Stop}"
                        Command="{Binding StopCommand}"/>
                <Button DockPanel.Dock="Right"
                        Width="Auto"
                        Padding="20 0"
                        IsEnabled="{Binding IsRun, Converter={StaticResource InversedBooleanConverter}}"
                        Content="{x:Static res:Resources.Start}"
                        Command="{Binding RunCommand}"/>
                <Button DockPanel.Dock="Right"
                        Width="20"
                        Margin="0 0 10 0"
                        IsEnabled="{Binding IsRun, Converter={StaticResource InversedBooleanConverter}}"
                        Content="..."
                        Command="{Binding BrowseLogCommand}"/>
                <ComboBox ItemsSource="{Binding SavedFiles}"
                          DisplayMemberPath="FileName"
                          Text="{Binding FileName}"
                          IsEnabled="{Binding IsRun, Converter={StaticResource InversedBooleanConverter}}"
                          IsEditable="False"
                          SelectionChanged="ComboBox_OnSelectionChanged"
                          ContextMenuService.ShowOnDisabled="True">
                    <ComboBox.ContextMenu>
                        <ContextMenu>
                            <MenuItem Header="{x:Static res:Resources.Command_ShowInExternalEditor}" Command="{Binding ShowInExternalEditorCommand}"/>
                        </ContextMenu>
                    </ComboBox.ContextMenu>
                </ComboBox>
            </DockPanel>
            
            <WrapPanel DockPanel.Dock="Top"
                       Margin="5">
                <WrapPanel.Resources>
                    <Style TargetType="CheckBox">
                        <Setter Property="Margin" Value="0 0 5 0"/>
                    </Style>
                    <Style TargetType="RadioButton">
                        <Setter Property="Margin" Value="0 0 5 0"/>
                    </Style>
                </WrapPanel.Resources>

                <StackPanel Orientation="Horizontal" Margin="0 0 20 0">
                    <TextBlock Text="{Binding Source={x:Static res:Resources.FilterLevel}, StringFormat='{}{0}: '}"/>
                    <CheckBox Content="Debug" IsChecked="{Binding FilterLevel, Converter={StaticResource FilterConverter}, ConverterParameter=Level.Debug, Mode=TwoWay}"/>
                    <CheckBox Content="Info" IsChecked="{Binding FilterLevel, Converter={StaticResource FilterConverter}, ConverterParameter=Level.Info, Mode=TwoWay}"/>
                    <CheckBox Content="Warn" IsChecked="{Binding FilterLevel, Converter={StaticResource FilterConverter}, ConverterParameter=Level.Warn, Mode=TwoWay}"/>
                    <CheckBox Content="Error" IsChecked="{Binding FilterLevel, Converter={StaticResource FilterConverter}, ConverterParameter=Level.Error, Mode=TwoWay}"/>
                    <CheckBox Content="Fatal" IsChecked="{Binding FilterLevel, Converter={StaticResource FilterConverter}, ConverterParameter=Level.Fatal, Mode=TwoWay}"/>
                </StackPanel>

                <StackPanel Orientation="Horizontal" Margin="0 0 20 0">
                    <TextBlock Text="{Binding Source={x:Static res:Resources.FilterHighlight}, StringFormat='{}{0}: '}"/>
                    <RadioButton Content="{x:Static res:Resources.Off}" GroupName="Highlighted" IsChecked="{Binding FilterHighlighted, Converter={StaticResource FilterConverter}, ConverterParameter=Highlight.0, Mode=TwoWay}"/>
                    <RadioButton Content="1" GroupName="Highlighted" IsChecked="{Binding FilterHighlighted, Converter={StaticResource FilterConverter}, ConverterParameter=Highlight.1, Mode=TwoWay}"/>
                    <RadioButton Content="2" GroupName="Highlighted" IsChecked="{Binding FilterHighlighted, Converter={StaticResource FilterConverter}, ConverterParameter=Highlight.2, Mode=TwoWay}"/>
                    <RadioButton Content="3" GroupName="Highlighted" IsChecked="{Binding FilterHighlighted, Converter={StaticResource FilterConverter}, ConverterParameter=Highlight.3, Mode=TwoWay}"/>
                </StackPanel>

                <StackPanel Orientation="Horizontal">
                    <TextBlock Text="{Binding Source={x:Static res:Resources.FilterText}, StringFormat='{}{0}: '}"/>
                    <TextBox Text="{Binding FilterText, UpdateSourceTrigger=PropertyChanged}" Width="200"/>
                    <CheckBox IsChecked="{Binding CaseSensitive, Converter={converter:BooleanToIsCheckedConverter}}" Content="{x:Static res:Resources.FilterTextCaseSensitive}"/>
                </StackPanel>
            </WrapPanel>
            
            <DataGrid Name="LogGrid"
                      ItemsSource="{Binding SourceView.View}" 
                      IsReadOnly="True"
                      CanUserAddRows="False"
                      AutoGenerateColumns="False"
                      SelectionUnit="FullRow"
                      GridLinesVisibility="Vertical"
                      VerticalGridLinesBrush="LightGray">
                <DataGrid.Resources>
                    <Style TargetType="DataGridRow">
                        <Setter Property="BorderThickness" Value="0 1 0 0"/>
                        <Setter Property="BorderBrush" Value="LightGray"/>
                        <Setter Property="Background" Value="{Binding Path=HighlightLevel, Converter={converter:IntToBrushConverter}, ConverterParameter={StaticResource HighlightingColors}}"/>
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding IsNextSecond}" Value="True">
                                <Setter Property="BorderBrush" Value="Black"/>
                             </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </DataGrid.Resources>
                <DataGrid.Columns>
                    <DataGridTextColumn Header="{x:Static res:Resources.Columns_Header_Time}" HeaderTemplate="{StaticResource DateTimeColumnHeaderTemplate}"/>
                    <DataGridTextColumn Header="{x:Static res:Resources.Columns_Header_Level}"/>
                    <DataGridTextColumn Header="{x:Static res:Resources.Columns_Header_Cite}"/>
                    <DataGridTextColumn Header="{x:Static res:Resources.Columns_Header_Message}"/>
                </DataGrid.Columns>
            </DataGrid>
        </DockPanel>
        <ToggleButton IsChecked="{Binding IsScrolledToEnd}" 
                      Content="⤓"  FontWeight="Bold"
                      Width="{x:Static SystemParameters.VerticalScrollBarWidth}" 
                      Height="{x:Static SystemParameters.HorizontalScrollBarHeight}"
                      HorizontalAlignment="Right" VerticalAlignment="Bottom" 
                      Margin="0" Padding="1,-4,0,0" FontSize="{Binding ScrolledToEndButtonFontSize}"
                      Focusable="False"
                      Click="ScrollToEndButton_OnClick">
            <ToggleButton.ToolTip>
                <Binding Path="IsScrolledToEnd">
                    <Binding.Converter>
                        <converter:BooleanToTextConverter IsTrue="{x:Static res:Resources.Button_ScrollToTop_On}"
                                                          IsFalse="{x:Static res:Resources.Button_ScrollToTop_Off}" />
                    </Binding.Converter>
                </Binding>
            </ToggleButton.ToolTip>
        </ToggleButton>
    </Grid>
</Window>