Develop Reference

How to Navigate between xaml controls of UWP using mouse wheel?

I am developing a UWP application in which I have several XAML controls(buttons, textblocks, checkboxes, etc). Ideally, The final user of this app should be able to navigate between these controls ONLY USING MOUSE WHEEL(this is a medical device UI in which only a mouse wheel will be available on top of the monitor). Now my question is that how to force this application use mouse wheel as the primary source of navigation between controls?
Some more feedbacks:
1.Right now, when I run my application in visual studio, I just see mouse pointer and of course buttons are sensitive to mouse clicks but in order to initiate an event, I have to hover to that element and click. MOUSE WHEEL IS NOT WORKING by default to navigate and select controls.
2.when I sideload this UWP application on a raspberry pi device and run the application there, the only way to navigate between controls is using an attached keyboard(possible to navigate and select controls using it). AGAIN ATTACHED MOUSE WHEEL IS NOT WORKING HERE.
an example of controls I use in my code is this:
xaml code:
<Button x:Name="button1" Grid.Column="0" Grid.Row="0" Content="Button1" Click="button1_click" />
<Button x:Name="button2" Grid.Column="1" Grid.Row="0" Content="Button2" Click="button2_click" />
<Button x:Name="button3" Grid.Column="2" Grid.Row="0" Content="Button3" Click="button3_click" />
c# code:
private void button1_click(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
//do sth
}
private void button2_click(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
//do sth
}
private void button3_click(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
//do sth
}
in above code, it is not possible to navigate between three buttons using mouse wheel(both in visual studio and raspberry pi).

AGAIN ATTACHED MOUSE WHEEL IS NOT WORKING HERE.
How did you register the 'MOUSE WHEEL' event in your code? It worked well on my side.
Please see the following code sample:
<StackPanel x:Name="root" >
<Button x:Name="button1" Grid.Column="0" Grid.Row="0" Content="Button1" Click="button1_click" />
<Button x:Name="button2" Grid.Column="1" Grid.Row="0" Content="Button2" Click="button2_click" />
<Button x:Name="button3" Grid.Column="2" Grid.Row="0" Content="Button3" Click="button3_click" />
</StackPanel>
public MainPage()
{
this.InitializeComponent();
Window.Current.CoreWindow.PointerWheelChanged += CoreWindow_PointerWheelChanged;
}
private async void CoreWindow_PointerWheelChanged(Windows.UI.Core.CoreWindow sender, Windows.UI.Core.PointerEventArgs args)
{
Debug.WriteLine(args.CurrentPoint.Properties.MouseWheelDelta);
UIElement element;
if (args.CurrentPoint.Properties.MouseWheelDelta > 0)
{
element = FocusManager.FindNextFocusableElement(FocusNavigationDirection.Up);
if (element == null)
{
element = FocusManager.FindLastFocusableElement(root) as UIElement;
}
var result = await FocusManager.TryFocusAsync(element, FocusState.Keyboard);
Debug.WriteLine((element as Button).Content.ToString() + " focused: " + result.Succeeded);
}
else
{
element = FocusManager.FindNextFocusableElement(FocusNavigationDirection.Down);
if (element == null)
{
element = FocusManager.FindFirstFocusableElement(root) as UIElement;
}
var result = await FocusManager.TryFocusAsync(element, FocusState.Keyboard);
Debug.WriteLine((element as Button).Content.ToString() + " focused: " + result.Succeeded);
}
}

just to give you an idea.
First you should handle tabIndex properties of all of those Items on form and set their order. also whats being triggered with you will move with the tab in your case with mouse wheel gonna be "Focused" or "GotFocus" method. so an event like "GotFocus" will be needed. also you need to handle mouse wheel movements(up or down). you may google about how to override TabIndex property from tab Key to Mouse wheel as you want.

ToolBar OverflowPanel remains open

I have a ToolBar with a ItemsTemplate which works fine until the OverflowPanel is Available.
The OverflowPanel does not close if i select one of the context actions.
The Problem only occurs if the Items are added via the ItemsSource binding:
<ToolBar ItemsSource="{Binding ContextActionViewModels}"
Background="Transparent"
ToolBarTray.IsLocked="True"
FocusManager.IsFocusScope="False">
<ToolBar.ItemTemplateSelector>
<views:ContextActionTemplateSelector>
<views:ContextActionTemplateSelector.SimpleContextActionDataTemplate>
<DataTemplate DataType="{x:Type viewModels:SimpleContextActionViewModel}">
<Button Name="Button"
Command="{Binding ActionCommand}"
Style="{StaticResource ToolBarButtonStyle}"
ToolTip="{userInterface:Translation Binding={Binding ToolTip}}">
<ContentControl Template="{Binding Icon,Converter={StaticResource NameToResourceConverter}}"
Margin="5"
VerticalAlignment="Center"
HorizontalAlignment="Center" />
</Button>
</DataTemplate>
</views:ContextActionTemplateSelector.SimpleContextActionDataTemplate>
<!-- Multiple DataTemplates follow!-->
Why is the DataTemplate / ItemTemplteSelector not working properly. While hardcoded Buttons in XAML work properly?
I uploaded a full sample that illustrates what is not working here:
Just Resize the window and try invoking one off the buttons in the OverflowPanel. While the 'ICommand' is executed properly the Popup stays open.

In the .NET framework source you can find the method that handles the closing behavior of OverflowPanel for ToolBar class:
private static void _OnClick(object e, RoutedEventArgs args)
{
ToolBar toolBar = (ToolBar)e;
ButtonBase bb = args.OriginalSource as ButtonBase;
if (toolBar.IsOverflowOpen && bb != null && bb.Parent == toolBar)
toolBar.Close();
}
When you define a DataTemplate and use ItemsSource property, the Parent property of the created button becomes null and the if check fails. This is the expected behavior of DataTemplate as described here:
For templates, the Parent of the template eventually will be null. To get past this point and extend into the logical tree where the template is actually applied, use TemplatedParent.
As a solution you can set the IsOverflowOpen property to false when you click any of the buttons:
<ToolBar Name="SomeToolBar" ItemsSource="{Binding Items}">
<ToolBar.ItemTemplate>
<DataTemplate DataType="local:ItemViewModel">
<Button Command="{Binding Command}" Content="{Binding Name}" Click="ButtonBase_OnClick"/>
</DataTemplate>
</ToolBar.ItemTemplate>
</ToolBar>
private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
{
SomeToolBar.IsOverflowOpen = false;
}

How to check if AutomationElement has focus?

I'm doing integration tests with help of UI Automation. I need to check if a user control has focus (IsFocused = true). Is it possible ? I tried using AutomationElement.FocusedElement, but as far as I checked it returns different control (probably outside of my app).
My control:
<UserControl GotFocus="UserControl_GotFocus" Focusable="True">
<DockPanel>
<Button DockPanel.Dock="Right" Content=">" IsTabStop="False" Focusable="False" Click="TextButton_Click" />
<TextBox Text="{Binding Text}" x:Name="textBox" />
</DockPanel>
code behind:
private void UserControl_GotFocus(object sender, RoutedEventArgs e)
{
textBox.Focus();
Keyboard.Focus(textBox);
}

You can get the AutomationElement associated with the control you care about, then get the AutomationElement.FocusedElement and compare them. If they are the same, then it is focused.
Also, AutomationElement.Current should have a HasKeyboardFocus property. You can see if that gives you the information you need.

Back button not working in XAML / W8

I have the following button on my page:
<AppBarButton Grid.Column="0" x:Name="backButton" Icon="Back" Margin="10,26,0,-1"
Command="{Binding NavigationHelper.GoBackCommand, ElementName=pageRoot}"
IsEnabled="True"
Visibility="Visible"
Foreground="Green"
AutomationProperties.Name="Back"
AutomationProperties.AutomationId="BackButton"
AutomationProperties.ItemType="Navigation Button" Grid.Row="1" Grid.RowSpan="2" VerticalAlignment="Stretch"
/>
The button appears but clicking it does nothing. This was placed on the second of two pages in the application. I followed the instructions in NavigatonHelper.cs to get it wired up to my second page, but haven't done anything special in the first. What am I missing?
I even tried tying the Click property to a custom function:
public void ClickGoBack(object sender, RoutedEventArgs routedEventArgs) {
this.Frame.Navigate(typeof(HubPage));
}
But this never even got hit when I clicked the button.

Have you checked the Click existed in AppBarButton defined?
like: <AppBarButton ... Click="ClickGoBack"></AppBarButton>
and you should use
if (this.Frame.CanGoBack)
{
this.Frame.GoBack();
}
instead of
this.Frame.Navigate(typeof(HubPage));

You could do this instead much more easier for me.
<AppBar><Button Style="{StaticResource BackButtonStyle}" Click="Click1"></Button>
</AppBar>
and for your code behind...
private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
{
Frame.GoBack();
}

Something was put after the top grid in the XAML that overlapped the button - I didn't understand the concept of "natural order" until now. Thanks for the help everyone!

Get previous page name

something that I thought would be simple is turning out not to be, or I'm just not thinking hard enough :)
I have a page which I navigate to, in the OnNavigateTo event I set the SelectedIndex of a ListPicker and that works fine.
If I then touch the ListPicker and select a new value the OnNavigateTo event is fired again and the new value is overridden by the original value.
My initial thought was to simply check the parent page name and if it was the ListPicker then skip the initial setting but I can't seem to find where to get the parent page name from.
Any clues? or a better way I should be handling this?
Here's the XAML:
<toolkit:ListPicker x:Name="Status" Margin="10,549,163,-97" Header="Status" FullModeHeader="Status" ExpansionMode="FullScreenOnly" BorderBrush="Black" Foreground="Black" Grid.ColumnSpan="2" Visibility="Visible">
<toolkit:ListPicker.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding}" />
</DataTemplate>
</toolkit:ListPicker.ItemTemplate>
<toolkit:ListPicker.FullModeItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding}"
FontSize="43"
FontFamily="{StaticResource PhoneFontFamilyLight}"/>
</DataTemplate>
</toolkit:ListPicker.FullModeItemTemplate>
</toolkit:ListPicker>
And here's the Loaded event:
private void AddNote_Loaded(object sender, RoutedEventArgs e)
{
this.TicketStatus.ItemsSource = ticketStatus();
string st;
if (NavigationContext.QueryString.TryGetValue("status", out st))
{
tStatus = st;
TicketStatus.SelectedIndex = GetStatus(tStatus);
}
}

Ok, worked around it but creating my own page list and manually adding and removing the pages I want to check for. Bit of a hack but it works :)