I'm having an issue with tabbing through the controls on a WPF application using the MVVM pattern. I have the following XAML which defines a tree structure
<Grid Background="Transparent" Margin="10">
<TreeView ItemsSource="{Binding FirstLevelNavigableViewModels}" Background="Transparent"
HorizontalContentAlignment="Stretch"
HorizontalAlignment="Stretch"
BorderThickness="0"
ItemContainerStyle="{StaticResource TreeViewItemStyle1}">
<TreeView.Resources>
<HierarchicalDataTemplate DataType="{x:Type ViewModel:VendorViewModel}" ItemsSource="{Binding Children}">
<View:VendorView HorizontalContentAlignment="Stretch" />
</HierarchicalDataTemplate>
<DataTemplate DataType="{x:Type ViewModel:ProductViewModel}">
<View:ProductView HorizontalContentAlignment="Stretch" />
</DataTemplate>
</TreeView.Resources>
</TreeView>
</Grid>
When the treeview is loaded, the XAML for the "ProductView" is as follows
<Border Margin="0,2,2,2" CornerRadius="3" Background="#3FC7B299" DockPanel.Dock="Right" HorizontalAlignment="Right" Width="109">
<StackPanel Orientation="Vertical" Margin="6,4">
<DockPanel>
<TextBlock DockPanel.Dock="Left" FontFamily="Segoe" FontSize="10" FontWeight="Medium"
Foreground="Black" Opacity="0.75"
Text="CALC. REG. PRICE"></TextBlock>
<Button Width="10" Height="10" Background="Transparent" BorderBrush="Transparent" BorderThickness="0" Padding="-4" Margin="0" Command="{Binding UserDefinedRetailPriceCommand}" Visibility="{Binding UserDefinedRetailPriceButtonView}">
<Image Width="10" Height="10" Source="/Arhaus.Pricing.Client;component/Styles/Images/error.png"></Image>
</Button>
</DockPanel>
<TextBox FontFamily="Segoe" FontSize="16" FontWeight="Medium" KeyboardNavigation.IsTabStop="True" KeyboardNavigation.TabIndex="{Binding RegularPriceTabIndex}"
Foreground="Black" Opacity="0.9" KeyboardNavigation.TabNavigation="Continue"
ebf:LostFocusBehaviour.LostFocusCommand = "{Binding LostFocusSugg}"
Text="{Binding NewSuggestedRetailPrice,Converter={StaticResource FormattingConverter}, ConverterParameter=' \{0:C\}', Mode=TwoWay, UpdateSourceTrigger=LostFocus}" Background="#FFE6DED3" BorderBrush="#FFE6DED3" DataContext="{Binding StringFormat=\{0:c\}, NotifyOnValidationError=True}" Padding="0" TabIndex="1"></TextBox>
</StackPanel>
</Border>
I have the Tab Index bound to an integer that is ever increasing and bound as the treeview is loaded (I.E. I have it setup as tab index 1, 2, 3 etc. as each successive model is loaded).
I would like to be able to hit tab and jump to the next textbox in the treeview but when I click the TAB key, nothing happens. I'm not sure if I have the tabbing setup correctly but I'm very new to WPF and at a loss as to where and how to set the tabbing to make it work. I'm used to WinForms where you just set the tab index and go from there.
Thank you for your assistance, I apologize for the large code block.
I don't have a solution ready but some thoughts that maybe may help:
I don't know what RegularPriceTabIndex returns but probably it begins for each new TreeViewItem at the same index?
The same tab-index is given then multiple times because of repeating use of ProductView. Perhaps this leads to a problem. You can try setting FocusManager.IsFocusScope="true" for the ProductView. Maybe this helps.
Try also to set Control.IsTabStop="true" on the TextBox.
Related
I have to bind to local variable from code behind in ListView.ItemTemplate. I have tried using datacontext:
<ListView Name="listView" ItemsSource="{Binding}" DataContext="{Binding}" VerticalAlignment="Stretch" MaxHeight="300" Background="White" Foreground="Black" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch" BorderBrush="#FFCDCDCD" BorderThickness="1" ScrollViewer.VerticalScrollBarVisibility="Auto" IncrementalLoadingTrigger="None" SelectionChanged="listView_SelectionChanged" >
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" MaxHeight="25" >
<TextBlock Grid.Row="0" Grid.Column="0" Text="{Binding Text}" Width="{Binding Width}" />
<Image Grid.Row="0" Grid.Column="1" Source="{Binding Image}" Stretch="None" Width="40" HorizontalAlignment="Left" Margin="4,0,0,0" />
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
In place of "Width="{Binding Width}"" I want to have property from datacontext - rest of data is connected with itemsSource. How to "tell" xaml to use property from datacontext? (right now it returns error "property not found"). I don't want to change my itemsource and add there width because it is constant for every element (it's obvious ;) ).
Thank you in advance :)
It does use the DataContext, which for the ItemTemplate is the item. You can walk up the tree to find another DataContext, in this case you want the ListView's:
{Binding DataContext.Width,
RelativeSource={RelativeSource AncestorType=ListView}}
How do I update a nested ListBox in my viewmodel (Mvvm Light) without page navigation after the initial view has been displayed. Currently I am doing a re-entrant page navigation using a changing querystring - there must be a better way?
RaisePropertyChanged is having no effect although I can see the data is populated with the correct data when the callback from the soap request triggered via OpenCallingPoints has fired.
The grid I am trying to populate with soap data is CallingPointsGrid
Short version of the code...
<ListBox x:Name="ResultsListBox" Margin="0" VerticalAlignment="Top" ItemsSource="{Binding JourneyLegs, Mode=TwoWay}" Background="{StaticResource BackgroundWhiteGradientBrush}" >
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel x:Name="StationItem" Orientation="Vertical" VerticalAlignment="Top" background="{Binding id, Converter={StaticResource myconverter}}">
<Grid Name="CallingPointsGrid" Margin="15,10,55,10" Visibility="{Binding JourneyCallingPoints, Converter={StaticResource CallingPointsVisibilityConverter}}" Background="{StaticResource BackgroundWhiteGradientBrush}">
<ListBox Grid.Row="1" Name="CallingPointsListBox" DataContext="{Binding}" VerticalAlignment="Top" ItemsSource="{Binding JourneyCallingPoints, Mode=TwoWay}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel VerticalAlignment="Top" Orientation="Horizontal">
<TextBlock Margin="0" VerticalAlignment="Center" HorizontalAlignment="Left" Width="210" x:Name="Destination" Foreground="Black" Text="{Binding stationName}" />
<TextBlock Margin="5,0,5,0" VerticalAlignment="Center" HorizontalAlignment="Left" Width="75" x:Name="ScheduledDepartureTime" FontWeight="Bold" Foreground="{StaticResource BackgroundBlueLightSolidColor}" Text="{Binding timetable.scheduledTimes.arrival, StringFormat=\{0:HH:mm\}}" />
<TextBlock Margin="5,0,5,0" VerticalAlignment="Center" HorizontalAlignment="Left" Width="75" x:Name="ScheduledArrivalTime" FontWeight="Bold" Foreground="{StaticResource BackgroundBlueLightSolidColor}" Text="{Binding timetable.scheduledTimes.departure, StringFormat=\{0:HH:mm\}}" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
<i:Interaction.Triggers>
<i:EventTrigger SourceName="ResultsListBox" EventName="Tap">
<i:EventTrigger.Actions>
<local:OpenCallingPoints />
</i:EventTrigger.Actions>
</i:EventTrigger>
</i:Interaction.Triggers>
You might look at this:
http://matthamilton.net/madprops-mvvmlight-screenconductor
I was going to suggest you look at Caliburn Micro and was searching around to see if Mvvm-Light had something similar. That article talks about that.
That's one of the things I really like about CM, when you inherit your ViewModel from Screen you automatically get OnInitialize, OnActivate, OnDeactive, OnViewLoaded, and OnViewReady methods you can override. So in this case you'd stick that logic in OnActivate.
On windows phone CM will also auto parse out the query string parameters and populate a property on your VM with them.
It looks like the screen conductor allows you to do similar with mvvm-light.
I have a TextBox in my application that i am developing and the binding is done in the xaml
I want to be able to raise an event when the binding of the TextBox Text Property is completed meaning when the text is loaded/changed through binding into the TextBox how do i achive this?
I tried TextChanged Event also Loaded Event but no luck right after the Binding is complected so how do i do it?
<ListBox x:Name="listBoxCategories" Background="Transparent" BorderThickness="0" Grid.Row="4" Grid.ColumnSpan="2" Margin="0" Padding="0" ItemContainerStyle="{StaticResource ListBoxItemStyle}" ItemsSource="{Binding ElementName=discussion_categoryDomainDataSource, Path=Data}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel x:Name="stackPanelCategory" Orientation="Vertical" Margin="0" VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
<TextBlock x:Name="TextBlockCategoryId" Text="{Binding Path=CategoryID}" />
<toolkit:Expander IsExpanded="True" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Style="{StaticResource ForumExpanderStyleRight}">
<toolkit:Expander.Header>
<TextBlock FontSize="16" FontWeight="Bold" Foreground="White" Margin="4,0,4,0" Text="{Binding CategoryName}" LayoutUpdated="TextBlock_LayoutUpdated" />
</toolkit:Expander.Header>
<ListBox x:Name="listBoxBoards" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Background="Transparent" BorderThickness="0" Margin="0" Padding="0" ItemContainerStyle="{StaticResource ListBoxItemStyle}" ItemsSource="{Binding CategoryBoards}">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid Margin="0" HorizontalAlignment="Stretch" x:Name="GridBoard">
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</toolkit:Expander>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
at this line
<TextBlock x:Name="TextBlockCategoryId" Text="{Binding Path=CategoryID}" />
I want an event where when the Binding is completed i want to give a different data source for the list box under the parent stack panel so i need the binding event so when i have the catedory id int he text block which later will be hidden in the xaml ( which now is not collapsed for testing reasons )
This is a slightly peculiar thing to want to do, it might help if you tell us why you are wanting to do this?
However, with no other information to hand, I will propose a solution.
If the TextBox API events do not provide the infomation you need, try handing the LayoutUpdated event. This event fires each time layout occurs, which is typically as elements ae added to the visual tree. WHen this event fires inspect your TextBox.Text property to see if it is set.
This solved the problem for me :)
<TextBlock FontSize="16" FontWeight="Bold" Foreground="White" Margin="4,0,4,0" Text="{Binding CategoryName}" Loaded="TextBlock_Loaded" />
Loaded event in the inner Text block rather than the upper textblock because by the time this is loaded the upper text block's text is already bound so i can retrive the ID :)
I have a ListView bound to an ObservableCollection of CustomerContacts.
It works great so far, but being new to this, I'm not sure how to do the next part.
Each customer contact has several contact types, which I want to display under their name.
So inside of CustomerContacts I have another ObservableCollection of ContactTypes.
Here is my current datatemplate:
<DataTemplate x:Key="iconTemplate">
<DockPanel Height="133" Width="150">
<Image Source="/Tracks%203.5;component/Images/NoPic.png" Height="25" Width="25" Margin="1,0" />
<TextBlock DockPanel.Dock="Top" Text="{Binding FullName}" Margin="5,3,5,0" FontWeight="Bold" HorizontalAlignment="Left" />
<<TextBlock Text="{Binding Title}" Margin="5,0,5,3" HorizontalAlignment="Left" />>
</DockPanel>
</DataTemplate>
And here's my first attempt at putting the listview inside:
<DataTemplate x:Key="iconTemplate">
<DockPanel Height="133" Width="150">
<Image Source="/Tracks%203.5;component/Images/NoPic.png" Height="25" Width="25" Margin="1,0" />
<TextBlock DockPanel.Dock="Top" Text="{Binding FullName}" Margin="5,3,5,0" FontWeight="Bold" HorizontalAlignment="Left" />
<ListView ItemsSource="{Binding ContactTypes}">
<ListView.Template>
<ControlTemplate TargetType="ItemsControl">
<ItemsPresenter/>
</ControlTemplate>
</ListView.Template>
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal"/>
</ItemsPanelTemplate>
</ListView.ItemsPanel>
<ListView.ItemTemplate>
<DataTemplate>
<TextBlock Margin="3,0,0,0" HorizontalAlignment="Center" Text="{Binding Path=ContactType}"/>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<!--<TextBlock Text="{Binding Title}" Margin="5,0,5,3" HorizontalAlignment="Left" />-->
</DockPanel>
</DataTemplate>
I want to replace the TextBlock bound to Title with a ListView/ListBox/ItemsControl bound to the items in ContactTypes.
Somewhat similar to this question: < WPF: bind to a List inside a class > but without all the codebehind. It would be nice to have it in the XAML.
There's a couple things I would do here:
Simplify what you're trying to do in order to isolate the problem. Instead of that whole ListView business, just put in there an ItemsControl: <ItemsControl ItemsSource="{Binding ContactTypes}" /> That'll give you the default view of things, which may just show you the data type of your objects (whatever ContactTypes is), but it'll let you know if the binding is working. If it is, you'll get something listed there. If it isn't, you won't.
If you're not getting anything listed, go use Snoop to drill into it and look for errors. Snoop shows the databinding errors, allows you to inspect the DataContext of each of the items, etc.
If you're still having problems, it might benefit us if you posted your class definitions and your code where you wire things up. There might be some other underlying issues (for instance, is the ContactTypes property null when the binding initially occurs and you're not using INPC to let the binding system know when it changes?).
I have a two pages say Main.xaml and Details.xaml.Each page has a ListBox and I am setting each of it to a collection in ViewModel(Same collection).The strange thing is that when i select an item in Details page it calls the SelectionChanged event handler on Main page and Details page.Is this a bug?
I have solved the problem by unhooking SelectionChanged eventhandler in OnNavigatedFrom() method.
EDIT
In Main.Xaml I have something like below:
<ListBox Name="MainDataListBox" Margin="8,113,8,8" ItemsSource="{Binding DataList}" SelectionChanged="MainDataListBox_SelectionChanged">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" >
<Border BorderThickness="3" BorderBrush="#A5FFFFFF" Width="80" Margin="0,20,0,20" Height="60">
<Image Source="{Binding ImageUrl, Mode=OneWay}" VerticalAlignment="Stretch" Margin="0,0,0,0" Width="80" Height="60" Stretch="Fill" />
</Border>
<TextBlock TextWrapping="Wrap" Text="{Binding Title}" FontSize="40" FontWeight="Normal" VerticalAlignment="Center" Margin="30,0,0,0" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
In Details.xaml also I have same kind of ListBox:
<ListBox Name="DetailDataListBox" Margin="8,113,8,8" ItemsSource="{Binding DataList}" SelectionChanged="DetailDataListBox_SelectionChanged">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" >
<Border BorderThickness="3" BorderBrush="#A5FFFFFF" Width="80" Margin="0,20,0,20" Height="60">
<Image Source="{Binding ImageUrl, Mode=OneWay}" VerticalAlignment="Stretch" Margin="0,0,0,0" Width="80" Height="60" Stretch="Fill" />
</Border>
<TextBlock TextWrapping="Wrap" Text="{Binding Title}" FontSize="40" FontWeight="Normal" VerticalAlignment="Center" Margin="30,0,0,0" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
Both of the Pages Main and Details have seperate EvenHandlers MainDataListBox_SelectionChanged and DetailDataListBox_SelectionChanged.
The problem is when i select an Item in Details Page MainDataListBox_SelectionChanged is called first and then DetailDataListBox_SelectionChanged.
Also my viewmodel is a static one in App.cs and I am setting the data context of both these pages to same viewmodel.
Thanks and Regards
vaysage
As both listsboxes were bound to the same dataset a change in the selected time in one list would have affected the other.
Obviosuly you're found a work around but I'd recommend having a unique view model for each page. If the page is just a different way of displaying the same data use a single page and alter the display as appropriate. (Creating your own visual states may be a good way to do this.)