<Window x:Class="WpfApplication50.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:system="clr-namespace:System;assembly=mscorlib"
        xmlns:linq="clr-namespace:System.Linq;assembly=System.Core"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <Style x:Key="BaseButtonStyle" TargetType="{x:Type Button}">
            <Setter Property="Margin" Value="2"/>
        </Style>
        
        <Style x:Key="Style1" TargetType="{x:Type Button}" BasedOn="{StaticResource BaseButtonStyle}">
            <Style.Triggers>
                <EventTrigger RoutedEvent="Click">
                    <EventTrigger.Actions>
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetProperty="Opacity" To="0" Duration="0:0:1"/>
                                <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility">
                                    <DiscreteObjectKeyFrame KeyTime="0:0:1" Value="{x:Static Visibility.Collapsed}"/>
                                </ObjectAnimationUsingKeyFrames>
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger.Actions>
                </EventTrigger>
            </Style.Triggers>
        </Style>
        <Style x:Key="Style2" TargetType="{x:Type Button}" BasedOn="{StaticResource BaseButtonStyle}">
            <Setter Property="RenderTransformOrigin" Value="0.5,0.5"/>
            <Setter Property="RenderTransform">
                <Setter.Value>
                    <RotateTransform/>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <Trigger Property="IsMouseOver" Value="True">
                    <Trigger.EnterActions>
                        <BeginStoryboard x:Name="RotateAnimation">
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetProperty="RenderTransform.(RotateTransform.Angle)"  From="0" To="360" Duration="0:0:3" RepeatBehavior="Forever"/>
                            </Storyboard>
                        </BeginStoryboard>
                    </Trigger.EnterActions>
                    <Trigger.ExitActions>
                        <StopStoryboard BeginStoryboardName="RotateAnimation"/>
                    </Trigger.ExitActions>
                </Trigger>
            </Style.Triggers>
        </Style>

        <ObjectDataProvider x:Key="Range" ObjectType="{x:Type linq:Enumerable}"
                            MethodName="Range">
            <ObjectDataProvider.MethodParameters>
                <system:Int32>0</system:Int32>
                <system:Int32>20</system:Int32>
            </ObjectDataProvider.MethodParameters>
        </ObjectDataProvider>
    </Window.Resources>
    <UniformGrid Columns="2">
        <ItemsControl ItemsSource="{Binding Source={StaticResource Range}}">
            <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <UniformGrid Rows="5" Columns="4"/>
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
            <ItemsControl.ItemTemplate>
                <DataTemplate>
                    <Button Content="{Binding}" Style="{StaticResource Style1}"/>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
        </ItemsControl>
        <ItemsControl ItemsSource="{Binding Source={StaticResource Range}}">
            <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <UniformGrid Rows="5" Columns="4"/>
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
            <ItemsControl.ItemTemplate>
                <DataTemplate>
                    <Button Content="{Binding}" Style="{StaticResource Style2}"/>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
        </ItemsControl>
    </UniformGrid>
</Window>

<Window x:Class="WpfApplication50.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">
    <Window.Resources>
        <Style x:Key="ProgressBarStyle" TargetType="{x:Type ProgressBar}">
            <Setter Property="Opacity" Value="0.0"/>
            <Setter Property="Visibility" Value="Collapsed"/>
            <Style.Triggers>
                <DataTrigger Binding="{Binding IsWorked}" Value="True">
                    <DataTrigger.EnterActions>
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetProperty="Opacity" From="0" To="1" Duration="0:0:1"/>
                                <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility">
                                    <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="{x:Static Visibility.Visible}"/>
                                </ObjectAnimationUsingKeyFrames>
                            </Storyboard>
                        </BeginStoryboard>
                    </DataTrigger.EnterActions>
                    <DataTrigger.ExitActions>
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetProperty="Opacity" From="1" To="0" Duration="0:0:1"/>
                                <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility">
                                    <DiscreteObjectKeyFrame KeyTime="0:0:1" Value="{x:Static Visibility.Collapsed}"/>
                                </ObjectAnimationUsingKeyFrames>
                            </Storyboard>
                        </BeginStoryboard>
                    </DataTrigger.ExitActions>
                </DataTrigger>
                <DataTrigger Binding="{Binding IsWorked}" Value="False">
                    
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Window.Resources>
    <StackPanel>
        
        <StackPanel Orientation="Horizontal">
            <Button Content="Start" Width="200" Height="30" Margin="5" Click="Button_Click" />    
        </StackPanel>
        
        <ProgressBar Height="25" Margin="5"
                     Style="{StaticResource ProgressBarStyle}"
                     Minimum="0"
                     Value="{Binding FileOffset}"
                     Maximum="{Binding FileSize}"/>
        
    </StackPanel>

</Window>

    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            var mainModel = new MainModel();
            DataContext = mainModel;
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            var mainModel = DataContext as MainModel;
            if (mainModel == null) return;
            mainModel.StartOperation();
        }
    }

    public class MainModel : INotifyPropertyChanged
    {

        public MainModel()
        {
            _progress = new Progress<double>(OnProgressChanged);
            FileSize = 1000;
            FileOffset = 0;
        }

        private void OnProgressChanged(double obj)
        {
            FileOffset = obj;
        }

        public double FileSize
        {
            set
            {
                if (value.Equals(_fileSize)) return;
                _fileSize = value;
                OnPropertyChanged();
            }
            get { return _fileSize; }
        }

        public double FileOffset
        {
            set
            {
                if (value.Equals(_fileOffset)) return;
                _fileOffset = value;
                OnPropertyChanged();
            }
            get { return _fileOffset; }
        }

        public bool IsWorked
        {
            set
            {
                if (value.Equals(_isWorked)) return;
                _isWorked = value;
                OnPropertyChanged();
            }
            get { return _isWorked; }
        }

        private readonly IProgress<double> _progress;
        private double _fileSize;
        private double _fileOffset;
        private bool _isWorked;

        public void StartOperation()
        {
            IsWorked = true;
            Task.Factory.StartNew(OnWorker).ContinueWith(OnFinish);
        }

        private void OnFinish(Task obj)
        {
            IsWorked = false;
        }

        private void OnWorker()
        {
            var fileOffset = 0.0;
            while (fileOffset < FileSize)
            {
                fileOffset = fileOffset + 1;
                _progress.Report(fileOffset);

                Task.Delay(10).Wait();
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        [NotifyPropertyChangedInvocator]
        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
        }
    }