It seems that when a WPF application starts, nothing has focus.
This is really weird. Every other framework I\'ve used does just what you\'d expect: puts initial foc
This works, too:
<Window FocusManager.FocusedElement="{Binding ElementName=SomeElement}">
<DataGrid x:Name="SomeElement">
...
</DataGrid>
</Window>
I also faced the same problem. I had three text boxes inside canvas container and wanted the first text box to be focused when the user control opens. WPF code followed MVVM pattern. I created a separate behavior class for focusing the element and binded it to my view like this.
Canvas behavior code
public class CanvasLoadedBehavior : Behavior<Canvas>
{
private Canvas _canvas;
protected override void OnAttached()
{
base.OnAttached();
_canvas = AssociatedObject as Canvas;
if (_canvas.Name == "ReturnRefundCanvas")
{
_canvas.Loaded += _canvas_Loaded;
}
}
void _canvas_Loaded(object sender, RoutedEventArgs e)
{
FocusNavigationDirection focusDirection = FocusNavigationDirection.Next;
// MoveFocus takes a TraveralReqest as its argument.
TraversalRequest request = new TraversalRequest(focusDirection);
UIElement elementWithFocus = Keyboard.FocusedElement as UIElement;
if (elementWithFocus != null)
{
elementWithFocus.MoveFocus(request);
}
}
}
Code for view
<Canvas Name="ReturnRefundCanvas" Height="200" Width="1466" DataContext="{Binding RefundSearchViewModel}">
<i:Interaction.Behaviors>
<b:CanvasLoadedBehavior />
</i:Interaction.Behaviors>
<uc:Keyboard Canvas.Left="973" Canvas.Top="111" ToolTip="Keyboard" RenderTransformOrigin="-2.795,9.787"></uc:Keyboard>
<Label Style="{StaticResource Devlbl}" Canvas.Left="28" Content="Return and Refund Search" Canvas.Top="10" />
<Image Height="30" Width="28" Canvas.Top="6" Canvas.Left="5" Source="pack://application:,,,/HomaKiosk;component/images/searchF.png">
<Image.OpacityMask>
<ImageBrush ImageSource="pack://application:,,,/HomaKiosk;component/images/searchF.png"/>
</Image.OpacityMask>
</Image>
<Separator Height="4" Canvas.Left="6" Margin="0" Canvas.Top="35" Width="1007"/>
<ContentControl Canvas.Top="45" Canvas.Left="21"
ContentTemplate="{StaticResource ErrorMsg}"
Visibility="{Binding Error, Converter={c:StringNullOrEmptyToVisibilityConverter}}"
Content="{Binding Error}" Width="992"></ContentControl>
<Label Style="{StaticResource Devlbl}" Canvas.Left="29" Name="FirstName" Content="First Name" Canvas.Top="90" />
<wpf:AutoCompleteTextBox Style="{StaticResource AutoComp}" Height="32" Canvas.Left="33" ToolTip="First Name" Canvas.Top="120" Width="205" Padding="10,5" TabIndex="1001"
VerticalAlignment="Top"
Watermark=""
IconPlacement="Left"
IconVisibility="Visible"
Delay="100"
Text="{Binding FirstName, Mode=TwoWay, TargetNullValue=''}"
Provider="{Binding FirstNameSuggestions}">
<wpf:AutoCompleteTextBox.ItemTemplate>
<DataTemplate>
<Border Padding="5">
<StackPanel Orientation="Vertical">
<TextBlock Text="{Binding}"
FontWeight="Bold" />
</StackPanel>
</Border>
</DataTemplate>
</wpf:AutoCompleteTextBox.ItemTemplate>
</wpf:AutoCompleteTextBox>
<Label Style="{StaticResource Devlbl}" Canvas.Left="250" Content="Last Name" Canvas.Top="90" />
<wpf:AutoCompleteTextBox Style="{StaticResource AutoComp}" Height="32" ToolTip="Last Name" Canvas.Left="250" Canvas.Top="120" Width="205" Padding="10,5" TabIndex="1002"
VerticalAlignment="Top"
Watermark=""
IconPlacement="Left"
IconVisibility="Visible"
Delay="100"
Text="{Binding LastName, Mode=TwoWay, TargetNullValue=''}"
Provider="{Binding LastNameSuggestions}">
<wpf:AutoCompleteTextBox.ItemTemplate>
<DataTemplate>
<Border Padding="5">
<StackPanel Orientation="Vertical">
<TextBlock Text="{Binding}"
FontWeight="Bold" />
</StackPanel>
</Border>
</DataTemplate>
</wpf:AutoCompleteTextBox.ItemTemplate>
</wpf:AutoCompleteTextBox>
<Label Style="{StaticResource Devlbl}" Canvas.Left="480" Content="Receipt No" Canvas.Top="90" />
<wpf:AutoCompleteTextBox Style="{StaticResource AutoComp}" Height="32" ToolTip="Receipt No" Canvas.Left="480" Canvas.Top="120" Width="205" Padding="10,5" TabIndex="1002"
VerticalAlignment="Top"
Watermark=""
IconPlacement="Left"
IconVisibility="Visible"
Delay="100"
Text="{Binding ReceiptNo, Mode=TwoWay, TargetNullValue=''}"
Provider="{Binding ReceiptIdSuggestions}">
<wpf:AutoCompleteTextBox.ItemTemplate>
<DataTemplate>
<Border Padding="5">
<StackPanel Orientation="Vertical" >
<TextBlock Text="{Binding}"
FontWeight="Bold">
</TextBlock>
</StackPanel>
</Border>
</DataTemplate>
</wpf:AutoCompleteTextBox.ItemTemplate>
<i:Interaction.Behaviors>
<b:AllowableCharactersTextBoxBehavior RegularExpression="^[0-9]+$" MaxLength="15" />
</i:Interaction.Behaviors>
</wpf:AutoCompleteTextBox>
<!--<Label Style="{StaticResource Devlbl}" Canvas.Left="710" Content="Duration" Canvas.Top="79" />-->
<!--<ComboBox AllowDrop="True" Canvas.Left="710" ToolTip="Duration" Canvas.Top="107" Width="205" TabIndex="1004"
Style="{StaticResource CommonComboBox}"
ItemsSource="{Binding Durations}" DisplayMemberPath="Description" SelectedValuePath="Id" SelectedValue="{Binding SelectedDate, Mode=TwoWay}">
</ComboBox>-->
<Button Content="Search" Style="{StaticResource MyButton}" ToolTip="Search"
Canvas.Top="116" Canvas.Left="710" Cursor="Hand"
Command="{Binding SearchCommand}" TabIndex="2001">
</Button>
<Button Content="Clear" Style="{StaticResource MyButton}" ToolTip="Clear"
Canvas.Top="116" Canvas.Left="840" Cursor="Hand"
Command="{Binding ClearCommand}" TabIndex="2002">
</Button>
<Image Height="25" Width="25" Canvas.Top="175" Canvas.Left="25" Source="pack://application:,,,/HomaKiosk;component/images/chkpending.png"/>
<Label Style="{StaticResource LegendLbl}" Canvas.Left="50" Content="Check Returned and Payment Pending" Canvas.Top="178" />
<Image Height="25" Width="25" Canvas.Top="175" Canvas.Left="300" Source="pack://application:,,,/HomaKiosk;component/images/chkrepaid.png"/>
<Label Style="{StaticResource LegendLbl}" Canvas.Left="325" Content="Repaid" Canvas.Top="178" />
<Image Height="25" Width="25" Canvas.Top="175" Canvas.Left="395" Source="pack://application:,,,/HomaKiosk;component/images/refund.png"/>
<Label Style="{StaticResource LegendLbl}" Canvas.Left="415" Content="Refunded" Canvas.Top="178" />
</Canvas>
Above solution was not working as expected for me, I've changed slightly the behavior proposed by Mizipzor as following:
From this part
if ((bool)args.NewValue)
{
control.Loaded += (sender, e) =>
control.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
}
To this
if ((bool)args.NewValue)
{
control.Loaded += (sender, e) => control.Focus();
}
ANd I'm not attaching this behavior to Window or UserControl, but to control I want to focus initially, e.g.:
<TextBox ui:FocusBehavior.InitialFocus="True" />
Oh, sorry for different naming I'm using InitialFocus name for the attached property.
And this is working for me, maybe it could help someone else.
After having a 'WPF Initial Focus Nightmare' and based on some answers on stack, the following proved for me to be the best solution.
First, add your App.xaml OnStartup() the followings:
EventManager.RegisterClassHandler(typeof(Window), Window.LoadedEvent,
new RoutedEventHandler(WindowLoaded));
Then add the 'WindowLoaded' event also in App.xaml :
void WindowLoaded(object sender, RoutedEventArgs e)
{
var window = e.Source as Window;
System.Threading.Thread.Sleep(100);
window.Dispatcher.Invoke(
new Action(() =>
{
window.MoveFocus(new TraversalRequest(FocusNavigationDirection.First));
}));
}
The threading issue must be use as WPF initial focus mostly fails due to some framework race conditions.
I found the following solution best as it is used globally for the whole app.
Hope it helps...
Oran
A minimal version of Mizipzor's answer for C# 6+.
public static class FocusBehavior
{
public static readonly DependencyProperty GiveInitialFocusProperty =
DependencyProperty.RegisterAttached(
"GiveInitialFocus",
typeof(bool),
typeof(FocusBehavior),
new PropertyMetadata(false, OnFocusFirstPropertyChanged));
public static bool GetGiveInitialFocus(Control control) => (bool)control.GetValue(GiveInitialFocusProperty);
public static void SetGiveInitialFocus(Control control, bool value) => control.SetValue(GiveInitialFocusProperty, value);
private static void OnFocusFirstPropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
var control = obj as Control;
if (control == null || !(args.NewValue is bool))
return;
if ((bool)args.NewValue)
control.Loaded += OnControlLoaded;
else
control.Loaded -= OnControlLoaded;
}
private static void OnControlLoaded(object sender, RoutedEventArgs e) => ((Control)sender).MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
}
Use in your XAML:
<Window local:FocusBehavior.GiveInitialFocus="True" />
Had same problem solved it with simple solution: In the main window:
<Window ....
FocusManager.FocusedElement="{Binding ElementName=usercontrolelementname}"
... />
In the user control:
private void UserControl_GotFocus_1(object sender, RoutedEventArgs e)
{
targetcontrol.Focus();
this.GotFocus -= UserControl_GotFocus_1; // to set focus only once
}