animation in wpf - wpf

Question

I am a beginner in WPF.
I want to display my form on every tick.
but it's only displaying once.
when I debug this, it's hitting the this.topmost=true in timer tick event, but
it is not displaying the window.
I am not sure what's wrong with this code.
public partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
System.Windows.Threading.DispatcherTimer timer = new System.Windows.Threading.DispatcherTimer();
timer.Interval = new TimeSpan(0, 0, 0, 2, 0);
timer.Tick += tick;
timer.Start();
}
private void tick(object sender, EventArgs e)
{
this.Topmost = true;//display the form
this.Show();
}
}
<Border BorderThickness="1" Background="Beige" BorderBrush="Black" CornerRadius="10">
<StackPanel Margin="20">
<CheckBox Content="Checkable" Margin="5 5 0 5" />
<Button Content="Clickable" HorizontalAlignment="Center" />
</StackPanel>
</Border>
<!-- Animation -->
<Grid.Triggers>
<EventTrigger RoutedEvent="FrameworkElement.Loaded">
<BeginStoryboard>
<Storyboard>
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(ScaleTransform.ScaleY)">
<SplineDoubleKeyFrame KeyTime="0:0:0" Value="0"/>
<SplineDoubleKeyFrame KeyTime="0:0:0.0" Value="1"/>
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)">
<SplineDoubleKeyFrame KeyTime="0:0:2" Value="1"/>
<SplineDoubleKeyFrame KeyTime="0:0:8" Value="0"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Grid.Triggers>

Answer 1

This should do what you want. I have taken the WPF window that you wanted to show to your client and moved it into another form. I then created another startup form that is hidden and runs the timer showing your animation periodically.
Startup Form:
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="10" Width="10" ShowInTaskbar="False" Visibility="Hidden" >
<Grid />
</Window>
Startup Form Code Behind
public partial class MainWindow : Window
{
Window1 cyclicWindow;
public MainWindow()
{
InitializeComponent();
cyclicWindow = new Window1();
cyclicWindow.Show();
cyclicWindow.Topmost = true;
System.Windows.Threading.DispatcherTimer timer = new System.Windows.Threading.DispatcherTimer();
timer.Interval = new TimeSpan(0, 0, 0, 20, 0);
timer.Tick += tick;
timer.Start();
}
private void tick(object sender, EventArgs e)
{
if (cyclicWindow != null)
{
cyclicWindow.Close() ;
}
cyclicWindow = new Window1();
cyclicWindow.Show();
cyclicWindow.Topmost = true;
}
}
Cycling Window:
<Window x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="200" Width="300" Name="Main"
ShowInTaskbar="False" WindowStyle="None" Background="Transparent" >
<Grid Name="Base" Height="112">
<Border BorderThickness="1" Background="Beige" BorderBrush="Black" CornerRadius="10">
<StackPanel Margin="20">
<CheckBox Content="Checkable" Margin="5 5 0 5" />
<Button Content="Clickable" HorizontalAlignment="Center" />
</StackPanel>
</Border>
<!-- Animation -->
<Grid.Triggers>
<EventTrigger RoutedEvent="FrameworkElement.Loaded">
<BeginStoryboard>
<Storyboard>
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="Main" Storyboard.TargetProperty="(UIElement.RenderTransform).(ScaleTransform.ScaleY)">
<SplineDoubleKeyFrame KeyTime="0:0:0" Value="0"/>
<SplineDoubleKeyFrame KeyTime="0:0:0.0" Value="1"/>
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="Main" Storyboard.TargetProperty="(UIElement.Opacity)">
<SplineDoubleKeyFrame KeyTime="0:0:2" Value="1"/>
<SplineDoubleKeyFrame KeyTime="0:0:8" Value="0"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Grid.Triggers>
</Grid>
</Window>
Cycling Window Code Behind:
public partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
AllowsTransparency = true;
}
}