Programmatically showing a ToolTip

Question

I have developed a WPF sample project.

Here is the main Window's XAML markup :

<Window x:Class="ToolTipSample.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"
        WindowState="Maximized">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>

        <Button Click="OnButtonClick">Show ToolTip</Button>

        <StatusBar Grid.Row="2">
            <StatusBarItem>
                <TextBlock Text="TextBlock With ToolTip">
                    <TextBlock.ToolTip>
                        <ToolTip x:Name="m_toolTip">
                            ToolTip
                        </ToolTip>
                    </TextBlock.ToolTip>
                </TextBlock>
            </StatusBarItem>
        </StatusBar>
    </Grid>
</Window>

Here is the main Window's code-behind without the using statements :

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

        private void OnButtonClick(object p_sender, RoutedEventArgs p_args)
        {
            m_toolTip.IsOpen = true;
        }
    }
}

I want to programmatically show the ToolTip when the Button is clicked.
I want the ToolTip to be shown above its TextBlock parent.

The ToolTip is automatically shown when the mouse cursor is over the TextBlock and during a constant amount of time C approximatively equal to 5 seconds.
I want the ToolTip to be shown during C when the Button is clicked.

My goals are not achieved in the current project.
The ToolTip is shown when the Button is clicked :

But :

• The ToolTip is too far from its TextBlock parent.
• The ToolTip is not automatically hidden

What do I have to do to achieve my goals ?
Any help will be greatly appreciated.

Answer 1

I have achieved my goals.
Sheridan's answer and comments help me.
I have updated my sample project.
The ToolTip is now shown just above the TextBlock when the Button is clicked.
And a Timer's callback method closes the ToolTip after a constant amount of time equal to 2500 ms.

Here is the updated main Window's XAML markup :

<Window x:Class="ToolTipSample.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"
        WindowState="Maximized">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>

        <Button Click="OnButtonClick">Show ToolTip</Button>

        <StatusBar Grid.Row="2">
            <StatusBarItem>
                <TextBlock Width="900" />
            </StatusBarItem>
            <StatusBarItem>
                <TextBlock x:Name="m_statusMessage" Text="TextBlock With ToolTip" ToolTipService.ShowDuration="30000">
                    <TextBlock.ToolTip>
                        <ToolTip x:Name="m_toolTip" Placement="Top">
                            <TextBlock>
                                ToolTip ToolTipToolTipToolTipToolTipToo lTipToolTipToolTipT oolTipToolTipT
                                <LineBreak />
                                oolTipToolTi pToolTipToo lTipToolTipToolTipToolTipToolTipTo olTipToolTipToolTipTool
                                <LineBreak />
                                TipToo lTipToolTipToolTipToo lTipToolTipTo olTipToolTip
                            </TextBlock>
                        </ToolTip>
                    </TextBlock.ToolTip>
                </TextBlock>
            </StatusBarItem>
        </StatusBar>
    </Grid>
</Window>

Here is the updated main Window's code-behind without the using statements :

namespace ToolTipSample
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private Timer m_toolTipClosingTimer;

        public MainWindow()
        {
            InitializeComponent();
            m_toolTipClosingTimer = new Timer(ToolTipClosingCallBack, null, Timeout.Infinite, Timeout.Infinite);
        }

        private void OnButtonClick(object p_sender, RoutedEventArgs p_args)
        {
            m_toolTip.PlacementTarget = m_statusMessage;
            m_toolTip.IsOpen = true;
            m_toolTipClosingTimer.Change(2500, Timeout.Infinite);
        }

        private void ToolTipClosingCallBack(object p_useless)
        {
            Dispatcher.Invoke(() =>
                {
                    m_toolTip.IsOpen = false;
                });
        }
    }
}