I have a collection defined as
public class BraiderList : ObservableCollection <Braider>
with the objects defines as
public class Braider : INotifyPropertyChanged
The XAML code for displaying the data is shown below. As far as it goes, everything works correctly but I'd like to change how the items in my collection are displayed. I'd like to have each item in my collection be a separate item in a wrap panel instead of them all being part of one control. Is there any way to do this in XAML or do I need to write the code in C# instead?
<Border Grid.Row="1" BorderBrush="Black" BorderThickness="5" CornerRadius="8" Margin="2,2" ClipToBounds="True" >
<WrapPanel Name="WPanel1">
<Border Margin="5" Padding="5">
<ItemsControl Name="MyList">
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel Name="SPanel1">
<Image Source="{StaticResource BraiderImage}" Height ="75" Width="150" Visibility ="{Binding ShowIcon}"/>
<Label Content= "{Binding Name}" Visibility ="{Binding ShowName}" HorizontalAlignment="Center"/>
<Label Content= "{Binding ProductionCounter}" ContentStringFormat="Production Counter: {0:0.0}" Visibility ="{Binding ShowProductionCounter}" />
<Label Content= "{Binding LeadFront}" ContentStringFormat="Lead, Front Deck: {0:0.0}" Visibility ="{Binding ShowLeadFront}"/>
<Label Content= "{Binding LeadBack}" ContentStringFormat="Lead, Back Deck: {0:0.0}" Visibility ="{Binding ShowLeadBack}"/>
<Label Content= "{Binding Address}" ContentStringFormat="IP Address: {0}" Visibility ="{Binding ShowIP}"/>
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Border>
</WrapPanel>
</Border>
Your XAML seems wrong.
What you're looking for is to set the WrapPanel as the ItemsPanel of the ItemsControl, in such a way that the ItemsControl uses the WrapPanel to layout it's items rather than being inside the WrapPanel itself, like this:
<!-- No Need for a WrapPanel outside the ItemsControl, remove it -->
<Border>
<ItemsControl Name="MyList">
<!-- use a WrapPanel as the ItemsPanel for this ItemsControl -->
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<!-- Rest of your XAML here -->
</ItemsControl>
</Border>
Related
I've written a code example below:
<StackPanel>
<TextBlock>Appointments today</TextBlock>
<ItemsControl ItemsSource="{Binding Appointments}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<controls:CalendarMonthDayEventsItemsPanel OutsideViewportCount="..." />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Border>
<TextBlock Text="{Binding Title}" />
</Border>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<StackPanel Orientation="Horizontal">
<TextBlock>+</TextBlock>
<TextBlock Text="{Binding ......}" /> <!-- Should show number of items in ItemsControl that are outside view, using CalendarMonthDayEventsItemsPanel.OutsideViewportCount -->
<TextBlock>more items</TextBlock>
</StackPanel>
</StackPanel>
I Created a custom Panel, the CalendarMonthDayEventsItemsPanel, and I use that panel as the itemspanel of the ItemsControl. In the panel's layout code, I determine how many items (panel childs) are outside the bounds of the panel. The property OutsideViewportCount contains the number of items that are outside of the visible bounds of the CalendarMonthDayEventsItemsPanel.
Now I want to show the value of OutsideViewportCount in a TextBlock that's below the ItemsControl.
This means I have to create some kind of binding, but everything I tried doesn't work.
Does someone have a solution or a better approach to achieve the same result?
Maybe you can make use of Tag property of ItemsPanel to relay the value of ItemsPanel as a workaround.
<ItemsControl x:Name="A"
ItemsSource="{Binding Appointments}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<local:CalendarMonthDayEventsItemsPanel OutsideViewportCount="{Binding RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}, Path=Tag, Mode=OneWayToSource}"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
...
</ItemsControl>
<StackPanel Orientation="Horizontal">
<TextBlock>+</TextBlock>
<TextBlock Text="{Binding ElementName=A, Path=Tag, Mode=OneWay}"/>
<TextBlock>more items</TextBlock>
</StackPanel>
I have a ConfigList object with a name and a Dictionary and I need to nest ItemsControls with different ItemsSource.
I tried to do it this way :
<ItemsControl x:Name="TestStep" Grid.Row="0" Grid.Column="0" ItemsSource="{Binding Path=ConfigList }" HorizontalAlignment="Center" VerticalAlignment="Center">
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Path=Ictrl.Nom}" />
</DataTemplate>
</ItemsControl.ItemTemplate>
<ItemsControl
ItemsSource="{Binding Path=Param}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Path=Key}" />
<TextBlock Text=" : " />
<TextBlock Text="{Binding Path=Value}" />
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</ItemsControl>
When I start my application, I've got this error :
System.Windows.Markup.XamlParseException : '' Adding a value to the
collection of type 'System.Windows.Controls.ItemCollection' threw an
exception. ' line number '25' and line position '14'. '
Internal Exception
InvalidOperationException: Invalid operation when ItemsSource is in
use. Access and edit items with ItemsControl.ItemsSource.
Any idea what the problem is?
You set an ItemsSource on the ItemsControl. The data template is used to create the controls that display the data. The created items are then put into the Items collection of the ItemsControl. If you add an element to the ItemsControl directly in XAML this will put them into the Items collection, too. Doing both is not allowed. You either specify an ItemsSource or add to Items directly. From the documentation:
Note that you use either the Items or the ItemsSource property to specify the collection that should be used to generate the content of your ItemsControl. When the ItemsSource property is set, the Items collection is made read-only and fixed-size.
However, in your case this is not the real issue, because your markup is wrong for what you want to achieve. If you you really intended to nest ItemsControls, you would simply change the data template for the outer ItemsControl to contain another ItemsControl that binds to a collection property within the outer data item. Since there is already a TextBox, you have to use a panel (e.g. StackPanel) to host multiple controls in the template.
<ItemsControl x:Name="TestStep" Grid.Row="0" Grid.Column="0" ItemsSource="{Binding Path=ConfigList }" HorizontalAlignment="Center" VerticalAlignment="Center">
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding Path=Ictrl.Nom}" />
<ItemsControl ItemsSource="{Binding Path=Param}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Path=Key}" />
<TextBlock Text=" : " />
<TextBlock Text="{Binding Path=Value}" />
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
If you want to have a hierarchical view of your data, using a TreeView might be a better fit.
I have a ViewModel with about 200 contacts and I am binding it to a ListView
<Grid>
<ScrollViewer
HorizontalScrollBarVisibility="Auto"
VerticalScrollBarVisibility="Auto">
<ListView x:Name="ContactListing" ItemsSource="{Binding ContactListing}" >
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Path=DisplayName}" />
<Image Source="{Binding Thumbnail,Converter={StaticResource ResourceKey=contactConv}}" />
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</ScrollViewer>
</Grid>
Would be great if someone could explain the details behind the ScrollViewers visibility
A ListView control already contains a ScrollViewer and implements scrolling based on the amount of items, there is no need to wrap this control in another ScrollViewer. You can double check this in the default ControlTemplate of ListView at line 6219 in the generic.xaml file containing all Windows 10 styles:
C:\Program Files (x86)\Windows Kits\10\DesignTime\CommonConfiguration\Neutral\UAP\10.0.10240.0\Generic\generic.xaml
So you simply have to remove the ScrollViewer from your XAML fragment.
<Grid>
<ListView x:Name="ContactListing" ItemsSource="{Binding ContactListing}" >
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Path=DisplayName}" />
<Image Source="{Binding Thumbnail,Converter={StaticResource ResourceKey=contactConv}}" />
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>
Note: As you're using a ListView, I suppose you want all your items stacked above each other. If you want multiple columns to show your items, use a GridView instead.
I have the following XAML which produces a vertical output of several TextBlocks and ListBoxes, however I want to change it so that it will go horizontally.
<StackPanel>
<TextBlock Margin="5" Text="Collated Results" FontWeight="Bold"
VerticalAlignment="Center" DockPanel.Dock="Top"/>
<ScrollViewer VerticalScrollBarVisibility="Auto"
HorizontalScrollBarVisibility="Auto" CanContentScroll="True">
<ItemsControl x:Name="lstCollatedSensorData">
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Margin="5" Width="100" Text="{Binding Name}"/>
<ListBox Margin="5" Width="100"
ItemsSource="{Binding CollatedResults}"/>
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</ScrollViewer>
</StackPanel>
The Textbox and Listbox in the StackPanel show correctly individually, however, each iteration is placed on top of each other, where I want them to be placed side by side horizontally. I have tried inserting WrapPanels in various locations without success, so there is obviously something that I am missing. It almost seems like the ScrollViewer is forcing the ItemsControl to be vertical rather than horizontal.
Put a stackpanel with orientation horizontal in the ItemsControl's ItemsPanel
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
Try setting Orientation on the stackpanel like so
StackPanel Orientation="Horizontal"
I have searched extensively on Google and am struggling to find an easy example to follow for an ItemsControl which I think I need to be able to do the following.
I currently have a Grid with a scrollable Listbox containing Checkboxes which works as expected using the following XAML layout
<Grid>
<ListBox ScrollViewer.VerticalScrollBarVisibility="Auto"
ItemsSource="{Binding Selections}" Margin="12,22,12,94">
<ListBox.ItemTemplate>
<DataTemplate>
<CheckBox IsChecked="{Binding IsChecked}"
Content="{Binding Path=Item.SelectionName}">
</CheckBox>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
I now want to add a TextBox to the right of each Checkbox so it's aligned horizontally with 1 Checkbox and 1 Textbox per row. I thought I would have to use an ItemsControl to allow two controls but using the ItemsControl as below I lose the ability to scroll
<Grid>
<ItemsControl ScrollViewer.VerticalScrollBarVisibility="Auto"
ItemsSource="{Binding Selections}" Margin="12,22,12,94">
<ItemsControl.ItemTemplate>
<DataTemplate>
<CheckBox IsChecked="{Binding IsChecked}"
Content="{Binding Path=Item.SelectionName}">
</CheckBox>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Grid>
Also, if I try and add a textbox similar to
<DataTemplate>
<CheckBox IsChecked="{Binding sChecked}" Content="{Binding Path=Item.BookieName}" />
<TextBox />
</DataTemplate>
I get an error The object 'DataTemplate' already has a child and cannot add 'TextBox'
Essentially, I want it to look like this
Can anyone give me a few pointers on how to structure the controls in XAML to get my desired layout?
Just use a StackPanel in your DataTemplate and set the orientation to horizontal.
<DataTemplate>
<StackPanel Orientation="Horizontal">
<CheckBox IsChecked="{Binding sChecked}" Content="{Binding Path=Item.BookieName}" />
<TextBox />
</StackPanel>
</DataTemplate>