How to create an attached property for the loaded event to focus on an element in VB.Net and WPF?
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I want to be able to add a line to my User Control that will focus on a certain element during the loaded event for the User Control:
<UserControl custom:FocusOnElement.FocusOn="{Binding ElementName=MyTextBox}">
<TextBox x:Name="MyTextBox" Text="Focus on me" />
My custom attached property class looks like this:
Public NotInheritable Class FocusOnElement
Public Shared FocusOnProperty As DependencyProperty = DependencyProperty.RegisterAttached("FocusOn", GetType(FrameworkElement), GetType(FocusOnElement), New FrameworkPropertyMetadata(AddressOf OnSetCallback))
Private Sub New()
End Sub
Public Shared Function GetFocusOn(element As UIElement) As FrameworkElement
Return CType(element.GetValue(FocusOnProperty), FrameworkElement)
End Function
Public Shared Sub SetFocusOn(element As UIElement, value As FrameworkElement)
element.SetValue(FocusOnProperty, value)
End Sub
Public Shared Sub FocusOnTarget(target As FrameworkElement)
Input.Keyboard.Focus(target)
End Sub
Public Shared Sub OnSetCallback(dependencyObject As DependencyObject, dependencyPropertyChangedEventArgs As DependencyPropertyChangedEventArgs)
Dim fwElement As FrameworkElement = TryCast(dependencyObject, FrameworkElement)
If fwElement Is Nothing Then Exit Sub
Dim target = GetFocusOn(fwElement)
If target Is Nothing Then Return
AddHandler fwElement.Loaded, Sub() FocusOnTarget(target)
End Sub
End Class
When I run the code, MyTextBox doesn't receive focus but I don't get any errors. What could I be doing wrong? Any help or pointers or things to try out would be greatly appreciated. Thank you.
c# .net wpf vb.net xaml
asked Nov 23 '18 at 14:40
1more1more
305
add a comment |
1
I want to be able to add a line to my User Control that will focus on a certain element during the loaded event for the User Control:
<UserControl custom:FocusOnElement.FocusOn="{Binding ElementName=MyTextBox}">
<TextBox x:Name="MyTextBox" Text="Focus on me" />
My custom attached property class looks like this:
Public NotInheritable Class FocusOnElement
Public Shared FocusOnProperty As DependencyProperty = DependencyProperty.RegisterAttached("FocusOn", GetType(FrameworkElement), GetType(FocusOnElement), New FrameworkPropertyMetadata(AddressOf OnSetCallback))
Private Sub New()
End Sub
Public Shared Function GetFocusOn(element As UIElement) As FrameworkElement
Return CType(element.GetValue(FocusOnProperty), FrameworkElement)
End Function
Public Shared Sub SetFocusOn(element As UIElement, value As FrameworkElement)
element.SetValue(FocusOnProperty, value)
End Sub
Public Shared Sub FocusOnTarget(target As FrameworkElement)
Input.Keyboard.Focus(target)
End Sub
Public Shared Sub OnSetCallback(dependencyObject As DependencyObject, dependencyPropertyChangedEventArgs As DependencyPropertyChangedEventArgs)
Dim fwElement As FrameworkElement = TryCast(dependencyObject, FrameworkElement)
If fwElement Is Nothing Then Exit Sub
Dim target = GetFocusOn(fwElement)
If target Is Nothing Then Return
AddHandler fwElement.Loaded, Sub() FocusOnTarget(target)
End Sub
End Class
When I run the code, MyTextBox doesn't receive focus but I don't get any errors. What could I be doing wrong? Any help or pointers or things to try out would be greatly appreciated. Thank you.
c# .net wpf vb.net xaml
asked Nov 23 '18 at 14:40
1more1more
305
Figured it out with this binding in the XAML:<UserControl custom:FocusOnElement.FocusOn="{x:Reference MyTextBox}">
– 1more
Nov 26 '18 at 14:19
add a comment |
1
1
1
I want to be able to add a line to my User Control that will focus on a certain element during the loaded event for the User Control:
<UserControl custom:FocusOnElement.FocusOn="{Binding ElementName=MyTextBox}">
<TextBox x:Name="MyTextBox" Text="Focus on me" />
My custom attached property class looks like this:
Public NotInheritable Class FocusOnElement
Public Shared FocusOnProperty As DependencyProperty = DependencyProperty.RegisterAttached("FocusOn", GetType(FrameworkElement), GetType(FocusOnElement), New FrameworkPropertyMetadata(AddressOf OnSetCallback))
Private Sub New()
End Sub
Public Shared Function GetFocusOn(element As UIElement) As FrameworkElement
Return CType(element.GetValue(FocusOnProperty), FrameworkElement)
End Function
Public Shared Sub SetFocusOn(element As UIElement, value As FrameworkElement)
element.SetValue(FocusOnProperty, value)
End Sub
Public Shared Sub FocusOnTarget(target As FrameworkElement)
Input.Keyboard.Focus(target)
End Sub
Public Shared Sub OnSetCallback(dependencyObject As DependencyObject, dependencyPropertyChangedEventArgs As DependencyPropertyChangedEventArgs)
Dim fwElement As FrameworkElement = TryCast(dependencyObject, FrameworkElement)
If fwElement Is Nothing Then Exit Sub
Dim target = GetFocusOn(fwElement)
If target Is Nothing Then Return
AddHandler fwElement.Loaded, Sub() FocusOnTarget(target)
End Sub
End Class
When I run the code, MyTextBox doesn't receive focus but I don't get any errors. What could I be doing wrong? Any help or pointers or things to try out would be greatly appreciated. Thank you.
c# .net wpf vb.net xaml
asked Nov 23 '18 at 14:40
1more1more
305
I want to be able to add a line to my User Control that will focus on a certain element during the loaded event for the User Control:
<UserControl custom:FocusOnElement.FocusOn="{Binding ElementName=MyTextBox}">
<TextBox x:Name="MyTextBox" Text="Focus on me" />
My custom attached property class looks like this:
Public NotInheritable Class FocusOnElement
Public Shared FocusOnProperty As DependencyProperty = DependencyProperty.RegisterAttached("FocusOn", GetType(FrameworkElement), GetType(FocusOnElement), New FrameworkPropertyMetadata(AddressOf OnSetCallback))
Private Sub New()
End Sub
Public Shared Function GetFocusOn(element As UIElement) As FrameworkElement
Return CType(element.GetValue(FocusOnProperty), FrameworkElement)
End Function
Public Shared Sub SetFocusOn(element As UIElement, value As FrameworkElement)
element.SetValue(FocusOnProperty, value)
End Sub
Public Shared Sub FocusOnTarget(target As FrameworkElement)
Input.Keyboard.Focus(target)
End Sub
Public Shared Sub OnSetCallback(dependencyObject As DependencyObject, dependencyPropertyChangedEventArgs As DependencyPropertyChangedEventArgs)
Dim fwElement As FrameworkElement = TryCast(dependencyObject, FrameworkElement)
If fwElement Is Nothing Then Exit Sub
Dim target = GetFocusOn(fwElement)
If target Is Nothing Then Return
AddHandler fwElement.Loaded, Sub() FocusOnTarget(target)
End Sub
End Class
When I run the code, MyTextBox doesn't receive focus but I don't get any errors. What could I be doing wrong? Any help or pointers or things to try out would be greatly appreciated. Thank you.
c# .net wpf vb.net xaml
c# .net wpf vb.net xaml
asked Nov 23 '18 at 14:40
1more1more
305
asked Nov 23 '18 at 14:40
1more1more
305
edited Nov 23 '18 at 14:45
1more
asked Nov 23 '18 at 14:40
1more1more
305
asked Nov 23 '18 at 14:40
1more1more
305
asked Nov 23 '18 at 14:40
1more1more
305
305
Figured it out with this binding in the XAML:<UserControl custom:FocusOnElement.FocusOn="{x:Reference MyTextBox}">
– 1more
Nov 26 '18 at 14:19
add a comment |
Figured it out with this binding in the XAML:<UserControl custom:FocusOnElement.FocusOn="{x:Reference MyTextBox}">
– 1more
Nov 26 '18 at 14:19
Figured it out with this binding in the XAML:
<UserControl custom:FocusOnElement.FocusOn="{x:Reference MyTextBox}">– 1more
Nov 26 '18 at 14:19
Figured it out with this binding in the XAML:
<UserControl custom:FocusOnElement.FocusOn="{x:Reference MyTextBox}">– 1more
Nov 26 '18 at 14:19
add a comment |
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Figured it out with this binding in the XAML:
<UserControl custom:FocusOnElement.FocusOn="{x:Reference MyTextBox}">– 1more
Nov 26 '18 at 14:19