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How can I capture WPF events from a Winforms app

I have an WPF User control which is is hosted in an Elementhost. I use elementhost to include an WPF user control in my classical Windows forms app.
Now, from Windows forms side I am trying to capture the mouseDown event that is produced in an WPF label but I don't know how to do it.
Any ideas?

A case might be able to help you. The winform form calls the wpf control.
Create a WPF custom control. The xaml code of the control is as follows.
<Grid>
<Image Margin="10,10,10,90" x:Name="img" Stretch="Uniform" Opacity="1">
<Image.BitmapEffect>
<DropShadowBitmapEffect Opacity="1" />
</Image.BitmapEffect>
</Image>
<TextBox Background="Transparent" Foreground="White" Height="40" FontSize="32" Margin="44,0,56,36" x:Name="txtBox1" Opacity="0.5" Text="" VerticalAlignment="Bottom" /> </Grid>
You need to add the corresponding function to set the effect. The code is as follows.
public void SetSource(string fileName)
{
img.Source = new BitmapImage(new Uri(fileName) );
}
public void SetOpacity(double opacity)
{
img.Opacity = opacity;
}
//
public string GetText()
{
return txtBox1.Text;
}
Create a Winform application and add a reference, otherwise the control will not work properly. The list of references is pictured below.
Regenerate the solution. On the left toolbar, a WPF control appears and drag it to the form.
Use the button control in the winform project to call the corresponding function.
private void button1_Click(object sender, EventArgs e)
{
((UserControl1)elementHost1.Child).SetSource(#"C:\Users\Admin\Pictures\Saved Pictures\9837f99502eba3d01d4fb671cab20c15.jpg");
}
private void button2_Click(object sender, EventArgs e)
{
((UserControl1)elementHost1.Child).SetOpacity(0.5);
}
private void button3_Click(object sender, EventArgs e)
{
string text = ((UserControl1)elementHost1.Child).GetText();
label1.Text = text;
}
Test items: The left side is the traditional Winform control. The right side is the imported WPF control. You can clearly see the "translucent" effect of the picture.

Not sure what exactly you're trying to achieve. Below is a simple example.You can edit the MouseDown event of the UserControl as needed.
If there is a problem, please make your problem clearer and show me the complete code sample that can reproduce your problem for analysis.
UserControl:
<Grid>
<Label x:Name="label" Content="Label" MouseDown="label_MouseDown" Background="AliceBlue" Width="300" Height="200" />
</Grid>
private void label_MouseDown(object sender, MouseButtonEventArgs e)
{
MessageBox.Show("hello");
}
Add the UserControl reference in the WinForms project, drag and drop the UserControl on the Form1 designer after rebuilding the WinForms project.
The result of running the project and clicking the Label in the UserControl is shown in the figure.

WPF Why button's background is blinking after press?

I created a UserControl, and added a Button inside it removing the Background and Text properties:
<Button x:Name="Button"
HorizontalAlignment="Center"
Height="40"
VerticalAlignment="Center"
Width="40"
RenderTransformOrigin="0,-2"
Margin="0,0,0,0"
BorderBrush="{x:Null}"
Click="Button_Click"
Background="{x:Null}"/>
I also hadled the Button Click event as below:
private void Button_Click(object sender, RoutedEventArgs e)
{
Button.Content = new cross();
}
The above code fills the Button content with another UserControl which is a simple cross pic.
I have placed the UserControl with the Button into a MainWindow app and after pressing Button, it starts blinking - background is fluently changing between two colours. Beside my functionality from code works good. I just don't know how to get rid of that blinking background.
Before click:
After click:

You could set Focusable="False" at your Button to achive this.
But you should read about the Focusableproperty in the MSDN to check if it's ok for you. I guess you can't focus the Buttonusing the tab key anymore. But maybe that's not a problem for you.

WPF Popup vs Tooltip

I have seen a lot of debate about when to use tooltip and when to use popup but I don't know which one is better for my case.
I have a button. When I click on it, the popup panel will appear and it has a lot of text and a small image (so it will be a quite big panel). The panel must stay there until I move my cursor OFF THE BUTTON (it must still close when the cursor is still on the panel but off the button).
<Button Click="clicked" MouseLeave="mouseleaved"/>
<Popup Name="mypopup">
<stuff>
</Popup>
private void clicked(object sender, RoutedEventArgs e) {
mypopopup.isopen = true;
}
private void mouseleaved(object sender, MouseEventArgs e) {
mypopup.isopen = false;
}
This is where I got to so far. The problem is that sometimes, the Popup appears on top of the button (which blocks the view of the button and so MouseLeave event kicks off, and Popup instantly disappears). I want the Popup to stay until i move the cursor away off the button.
So I did some google, and I think Tooltip may avoid this problem. But how to get Tooltip to appear on button click and not button hover?
Which one is better for me? Tooltip or Popup?
EDIT
I think I was not too clear with my question. I am asking which one i should use- Tooltip vs Popup based on MY SPECIFIC SITUATION (paragraph 2) and not in general. I think Popup is the right one to use but I have problems with using it (paragraph 3). so my question is can I solve this problem with Popup or should I use Tooltip better for this?

But how to get Tooltip to appear on button click and not button hover?
Handle the Click event for the Button and set the IsOpen property of the Popup to true:
private void Button_Click(object sender, RoutedEventArgs e)
{
popup1.IsOpen = true;
}
<Popup x:Name="popup1" StaysOpen="False">
<TextBlock>popup content...</TextBlock>
</Popup>
<Button Click="Button_Click" Content="op" />
Which one is better for me? Tooltip or Popup?
Popup is preferable whenever you want to customize the behaviour in any way.
Edit: If I understand your issue correctly, this should work:
<Button x:Name="button" Content="Button" Click="clicked" MouseLeave="mouseleaved"/>
<Popup Name="popup" PlacementTarget="{Binding ElementName=button}" StaysOpen="True" MouseLeave="mouseleaved">
<Border Background="Yellow">
<TextBlock>contents...</TextBlock>
</Border>
</Popup>
private void clicked(object sender, RoutedEventArgs e)
{
popup.IsOpen = true;
}
private void mouseleaved(object sender, MouseEventArgs e)
{
if (!button.IsMouseOver && !popup.IsMouseOver)
popup.IsOpen = false;
}

Universal Apps Windows Phone TextBox.SelectAll() with copy enabled does not work

In Store Apps / Universal Apps / Windows Phone 8.1 Visual Studio 2013 projects, how to to select programmatically all the text in a TextBox with the contextual copy icon menu enabled like in the following screen shot :
(source: free.fr)
The need is to display a text in a context where there is a big probability that the user will want to copy it in the clipboard.
The following tests did not work :
XAML
<TextBox x:Name="MyTextBox" Grid.Row="0"
HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
Text="The text I want to select"
IsReadOnly="True"
IsEnabled="True"
GotFocus="MyTextBox_GotFocus"></TextBox>
<Button x:Name="ButtonSelectAll" Grid.Row="1"
Content="Select All"
HorizontalAlignment="Center"
Click="ButtonSelectAll_Click"></Button>
C#
private void ButtonSelectAll_Click(object sender, RoutedEventArgs e)
{
MyTextBox.SelectAll();
// MyTextBox.Focus(FocusState.Programmatic);
}
private void MyTextBox_GotFocus(object sender, RoutedEventArgs e)
{
MyTextBox.SelectAll();
}
The try on Click event do nothing.
The try on GotFocus event select all the text but the contextual copy icon menu and the two handles are not shown.
If you add on the Click method "text.Focus(FocusState.Programmatic);" then the text is selected but the copy icon is not shown. And unfortunately, if you touch this text with you finger with the intention that the "copy icon" will appear, you lose the selection.

#efdummy Try this:
private void ButtonSelectAll_Click(object sender, RoutedEventArgs e)
{
MyTextBox.Select(0, MyTextBox.Text.Length);
string selectedText = MyTextBox.SelectedText;
DataPackage myPackage = new DataPackage();
myPackage.SetText(selectedText);
Clipboard.SetContent(myPackage);
}

How do I make a Popup included in it's parent Control for the sake of mouse events?

I have a Control that contains a Popup. I am trying to close the Popup whenever someone clicks outside of the Control. This is the part of my code that sets up the problem:
AddHandler(Mouse.PreviewMouseDownOutsideCapturedElementEvent, new MouseuttonEventHandler(HandleOutsideClick), true);
Now whenever I click in the Popup it causes PreviewMouseDownOutsideCapturedElementEvent to be raised. Am I misunderstanding this event? Is there something that I can do to have the Popup be considered a part of the Control so that it doesn't raise this event?

Does this work?
<Popup Name="Pop" LostFocus="ClosePop"/>
private void ClosePop(object sender, RoutedEventArgs e)
{
Pop.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
}
Put the XAML code in your .xaml page and the C# code in the related .xaml.cs file.
Note: You may need to put the focus on the popup before this works, it may be done automatically; I haven't done this on popups, but I have done it on other objects.
Update: This works for me, clicking in the TextBox that says Test1 opens the Popup, and clicking in the TextBox labeled Test2 closes it:
<Grid Background="White">
<StackPanel>
<TextBox Foreground="Black" LostFocus="ClosePop" GotFocus="OpenPop" Height="50">Test1</TextBox>
<TextBox Foreground="Black" Height="50">Test2</TextBox>
</StackPanel>
<Popup Name="Pop" Height="50" Width="50">
<TextBlock Foreground="White" VerticalAlignment="Center" HorizontalAlignment="Center">Pop!</TextBlock>
</Popup>
</Grid>
private void ClosePop(object sender, RoutedEventArgs e)
{
Pop.IsOpen = false;
}
private void OpenPop(object sender, RoutedEventArgs e)
{
Pop.IsOpen = true;
}