Develop Reference

Access current ItemsControl index via binding

I have the following piece of code
<ItemsControl x:Name="ItemsControl" ItemsSource="{Binding Offers}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Vertical"></StackPanel>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<wpf:Card Padding="32" Margin="5" d:DataContext="{d:DesignData }">
<StackPanel Margin="0,0,0,-30" Height="107">
<TextBlock
Style="{DynamicResource MaterialDesignTitleTextBlock}">
<Run Text="Offer " />
</TextBlock>
<TextBlock Text="{Binding CarDescription}" />
<Separator Height="1" Visibility="Hidden" />
<Button Content="Select"
Width="72"
VerticalAlignment="Bottom"
HorizontalAlignment="Right"
Margin="0,20,0,0"
Command="{Binding SelectOfferCommand}"/>
</StackPanel>
</wpf:Card>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
This produces a bunch of repeated boxes, every has a button. Every time i click the button i want to access current box index (from ItemsControl's ItemsSource) and pass it as a command parameter. Is it possible to do it?

You can pass the current Index of an ItemsControl using the AlterationIndex.
See more info here
Example:
<ItemsControl x:Name="ItemsControl"
ItemsSource="{Binding Offers}"
AlternationCount="1000">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Vertical"></StackPanel>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<wpf:Card Padding="32" Margin="5" d:DataContext="{d:DesignData }">
<StackPanel Margin="0,0,0,-30" Height="107">
<TextBlock
Style="{DynamicResource MaterialDesignTitleTextBlock}">
<Run Text="Offer " />
</TextBlock>
<TextBlock Text="{Binding CarDescription}" />
<Separator Height="1" Visibility="Hidden" />
<Button Content="Select"
Width="72"
VerticalAlignment="Bottom"
HorizontalAlignment="Right"
Margin="0,20,0,0"
Command="{Binding SelectOfferCommand}"
CommandParameter="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ContentPresenter}}, Path=(ItemsControl.AlternationIndex)}"/>
</StackPanel>
</wpf:Card>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>

May be it will be suitable for you to add index property to each Offer while creating Offers and send this index OnSelectOfferCommand. It will be much easier
ps I think i must explain my answer: My sugestion is not only easier in realisation, but also it is a good practice to seperate busines logic from UI. In this case if UI will be changed, changes will not effect whole ordering process

Windows 8 metro app: Accessing the button property

I am new to windows 8.1 development.
I created the pages below with the button on the xaml page
GroupedItemsPage.xaml.cs
GroupedItemsPage.xaml
<Button Style="{StaticResource mystyle}" Click="ItemView_ItemClick" x:Name="Testing">
I was thinking that on page load of the xaml page I will be able to have access to the button property
by doing something like this .. Testing.property as we normally do in the windows development environment. This is not happening. I want to be able to style some buttons programmatically.
How can I get the property of the button in the .cs file?
Thanks. Here is the xaml page below.
<GridView
x:Name="itemGridView"
AutomationProperties.AutomationId="ItemGridView"
AutomationProperties.Name="Grouped Items"
Grid.RowSpan="2"
Padding="116,137,40,46"
ItemsSource="{Binding Source={StaticResource groupedItemsViewSource}}"
SelectionMode="None"
IsSwipeEnabled="false"
>
<GridView.ItemTemplate>
<DataTemplate>
<Grid HorizontalAlignment="Left" Width="Auto" Height="Auto" >
<Image Source="{Binding ImagePath}" Stretch="UniformToFill" AutomationProperties.Name="{Binding Title}"/>
</Border>
<StackPanel VerticalAlignment="Bottom" Background="{ThemeResource ListViewItemOverlayBackgroundThemeBrush}">
<TextBlock Text="{Binding Title}" Foreground="{ThemeResource ListViewItemOverlayForegroundThemeBrush}" Style="{StaticResource TitleTextBlockStyle}" Height="60" Margin="15,0,15,0"/>
<TextBlock Text="{Binding Subtitle}" Foreground="{ThemeResource ListViewItemOverlaySecondaryForegroundThemeBrush}" Style="{StaticResource CaptionTextBlockStyle}" TextWrapping="NoWrap" Margin="15,0,15,10"/>
</StackPanel>-->
<Button Style="{StaticResource contactSquarePref}" Click="ItemView_ItemClick" x:Name="Testing">
<StackPanel Margin="5" >
<TextBlock Tag="cntCustName" Style="{ThemeResource CntNormalTextBlockStyle}" Text="{Binding Name }"/>
<TextBlock Tag="cntCatCode" Style="{ThemeResource CntLrgTextBlockStyle}" Text="{Binding Address}"/>
</StackPanel>
</Button>
</Grid>
</DataTemplate>
</GridView.ItemTemplate>
<GridView.ItemsPanel>
<ItemsPanelTemplate>
<ItemsWrapGrid GroupPadding="0,0,70,0"/>
</ItemsPanelTemplate>
</GridView.ItemsPanel>
<GridView.GroupStyle>
<GroupStyle>
<GroupStyle.HeaderTemplate>
<DataTemplate>
<Grid Margin="0,0,0,2">
<Button Foreground="{ThemeResource ApplicationHeaderForegroundThemeBrush}"
AutomationProperties.Name="Group Title"
Click="Header_Click"
Style="{StaticResource TextBlockButtonStyle}" >
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding ContactType}" Margin="0,-11,10,10" Style="{StaticResource SubheaderTextBlockStyle}" TextWrapping="NoWrap" />
<TextBlock Text="{StaticResource ChevronGlyph}" FontFamily="Segoe UI Symbol" Margin="0,-11,0,10" Style="{StaticResource SubheaderTextBlockStyle}" TextWrapping="NoWrap" />
</StackPanel>
</Button>
</Grid>
</DataTemplate>
</GroupStyle.HeaderTemplate>
</GroupStyle>
</GridView.GroupStyle>
</GridView>

It depends on your XAML. If your button is just a child element (i.e. part of your logical tree) or a named resource of your page, there'll be no problem, there's a code generation process on build, that creates required fields (in this case Button Testing) and finds required elements in InitializeComponent() generated method.
But if your button is a part of control template the only way to get reference to your element is GetTemplateChild() (if you're writing your own control, as this method is protected) or manually observing Visual Tree.
So, if you have a problem with the child element of your page, past all of your XAML markup here, as the line in the question above is not enough to find solution. But if you've defined button in control template, look at the second paragraph.

VariableSizedWrapGrid within GroupStyle events not firing

Ok, this is driving me nuts! I have spent a good half of my day working on this problem. I am using a XAML based Windows 8.1 app, and essentially I am trying to implement some drag and drop functionality between groups in a GridView. So far everything has been working, except when I try to "drop" an item into a new group. After way to much time, I have narrowed it down to the "drop" event not being fired for the GroupStyle.Panel VariableSizedWrapGrid. I was trying to follow something along the lines of this webpage.
I for the life of me cannot figure out why it won't fire. I have tried testing other drop events throughout my gridview, and they all seem to be working as expected.
Below is the code I currently have in place:
<GridView
x:Name="itemGridView"
AutomationProperties.AutomationId="ItemGridView"
AutomationProperties.Name="Grouped Items"
Grid.RowSpan="2"
Padding="116,137,40,46"
ItemsSource="{Binding Source={StaticResource groupedItemsViewSource}, Mode=TwoWay}"
SelectionMode="None"
CanDragItems="True"
DragItemsStarting="itemGridView_DragItemsStarting"
IsSwipeEnabled="true"
IsItemClickEnabled="True"
ItemClick="ItemView_ItemClick">
<GridView.ItemTemplate>
<DataTemplate>
<VariableSizedWrapGrid HorizontalAlignment="Left" Width="250" Height="250">
<Border Background="{ThemeResource ListViewItemPlaceholderBackgroundThemeBrush}">
<Image Source="{Binding Image}" Stretch="UniformToFill" AutomationProperties.Name="splash"/>
</Border>
<StackPanel VerticalAlignment="Bottom" Background="{ThemeResource ListViewItemOverlayBackgroundThemeBrush}">
<TextBlock Text="{Binding Path=Name }" Foreground="{ThemeResource ListViewItemOverlayForegroundThemeBrush}" Style="{StaticResource TitleTextBlockStyle}" Height="60" Margin="15,0,15,0"/>
</StackPanel>
</VariableSizedWrapGrid>
</DataTemplate>
</GridView.ItemTemplate>
<GridView.ItemsPanel>
<ItemsPanelTemplate>
<ItemsWrapGrid GroupPadding="0,0,70,0"/>
</ItemsPanelTemplate>
</GridView.ItemsPanel>
<GridView.GroupStyle>
<GroupStyle HidesIfEmpty="False">
<GroupStyle.HeaderTemplate>
<DataTemplate>
<VariableSizedWrapGrid Margin="0,0,0,2">
<Button Foreground="{ThemeResource ApplicationHeaderForegroundThemeBrush}"
AutomationProperties.Name="Group Title"
Style="{StaticResource TextBlockButtonStyle}"
Click="Button_Click">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Name}" Margin="0,-11,10,10" Style="{StaticResource SubheaderTextBlockStyle}" TextWrapping="NoWrap" />
<TextBlock Text="{StaticResource ChevronGlyph}" FontFamily="Segoe UI Symbol" Margin="0,-11,0,10" Style="{StaticResource SubheaderTextBlockStyle}" TextWrapping="NoWrap" />
</StackPanel>
</Button>
</VariableSizedWrapGrid>
</DataTemplate>
</GroupStyle.HeaderTemplate>
<GroupStyle.Panel>
<ItemsPanelTemplate>
<VariableSizedWrapGrid Drop="VariableSizedWrapGrid_Drop" AllowDrop="True"/>
</ItemsPanelTemplate>
</GroupStyle.Panel>
</GroupStyle>
</GridView.GroupStyle>
</GridView>
I really hope someone out there can see my error! I'm sure it is something simple, but I just need someone to point out the obvious. :)

Had the same problem, then found this example:
How to drag item between groups in grouped gridview
I tried to use StackPanel as ItemsPanel of GridView, worked for me. Try to use StackPanel instead of ItemsWrapGrid for your GridView.
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
Still can't understand this behavior, any ideas?

Listbox with more than one Control

Can somebody help me out in creating a listbox with a checkbox and star rating control align horizontally? I want it for WP7 using C# and XAML.

You need to code a custom list here is an example:
You need to include ControlToolkit:
xmlns:ControlsToolkit="clr-namespace:System.Windows.Controls"
and here is code:
<ListBox x:Name="listBox" SelectionMode="Multiple"
ItemContainerStyle="StaticResource ListBoxCheckedStyle}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<CheckBox Checked="{Binding YourPropertyPath}"/>
<TextBlock Text="{Binding Name}" Width="150" VerticalAlignment="Center"/>
<ControlsToolkit:Rating Height="50" Grid.Row="0" x:Name="rating" ItemCount="5">
<ControlsToolkit:Rating.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" VerticalAlignment="Stretch" HorizontalAlignment="Stretch"/>
</ItemsPanelTemplate>
</ControlsToolkit:Rating.ItemsPanel>
</ControlsToolkit:Rating>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
You can download sample from here:
DownloadSample
or check details here:
Sample site
You can get more detail on these:
CustomDataTemplateSelector
WP7 Checked ListBox in different ways.

Set the ItemTemplate:
<ListBox>
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<CheckBox Checked="{Binding YourPropertyPath}"/>
<ns:StarControl/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>

Arranging ItemsControl items within a DataTemplate

For some reason, Items added witin a dataTemplate will not do what I tell them to do!!
I am trying to put a number of images horizontally within a stackpanel, but no matter how I try, they only go vertically.
Here is my xaml.
<DataTemplate x:Name="View">
<Border BorderBrush="Red" BorderThickness="4" >
<StackPanel Orientation="Horizontal">
<ItemsControl ItemsSource="{Binding Path=_Collection, Mode=OneWay}" >
<ItemsControl.ItemTemplate>
<DataTemplate >
<Image Source="{Binding _Source}" />
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<TextBlock Height="30" FontFamily="Trebuchet MS" FontSize="18" Text="{Binding _Name}" />
</StackPanel>
</Border>
</DataTemplate>
Everything is bound ok. This is called from within the user control proper
<ItemsControl ItemTemplate="{StaticResource siteView}" ItemsSource="{Binding Path=_SiteDisplay"/>
My obervable colletion _SiteDisplay contains another oberservable collection called _Collection which holds the url of the image.
This is cut down from the real code, but illustrates the problem. I can not get the images to align horizontally! Any help very much appreciated - or suggestions for better ways of doing this.

You need to change the panel used by the ItemsControl, not the panel that contains the ItemsControl:
<ItemsControl ItemsSource="{Binding Path=_Collection, Mode=OneWay}" >
<ItemsControl.ItemTemplate>
<DataTemplate >
<Image Source="{Binding _Source}" />
</DataTemplate>
</ItemsControl.ItemTemplate>
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate >
<StackPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ItemsControl>