Develop Reference

WPF : adding a Button as "Show More" where on click of it would load remaining items in the itemControl which is already in Binding a Collection

I am bit new to WPF (XAML) and I have an ItemsControl bound to a list with a MyCollections property . Now my requirement is initially to show only 1st element from the list and having a Show More button option at the end of list. A click on it would show the rest of the items from the collection.
This is my XAML so far, displaying the whole collection:
<ItemsControl x:Name="ContentRoot" ItemsSource="{Binding MyCollections}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<grid>
<TextBox Text="{Binding }" />
<TextBox Text="{Binding }" />
</grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>

You can have both a ContentControl (which displays the first item of the collection) and an ItemsControl (which displays the whole collection) displayed only when a ToggleButton is checked for example.
<StackPanel>
<StackPanel.Resources>
<BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
<DataTemplate DataType="{x:Type local:MyViewModel}">
<Grid>
<TextBox Text="{Binding}" />
</Grid>
</DataTemplate>
</StackPanel.Resources>
<ContentControl Content="{Binding MyCollection[0]}"/>
<ToggleButton x:Name="toggle" Content="Show more"/>
<ItemsControl ItemsSource="{Binding MyCollection}" Visibility="{Binding ElementName=toggle, Path=IsChecked, Converter={StaticResource BooleanToVisibilityConverter}}"/>
</StackPanel>
You can then adapt this to fit your exact needs.

Reuse UserControl in TabControl with Various ViewModels

I have one user control that I would like to reuse with multiple ViewModels, all which implement the same interface. I would like to have these embedded in a TabControl.
Currently I can do this for a single instance but I am struggling to reuse my UserControl. For the single instance I can either bind the ViewModel in the UserContol's xaml or instantiate it in the code behind, however I can't figure out how to set this from a higher level.
Here is what I have,
<TabControl HorizontalAlignment="Left" Height="800" Margin="0,0,0,0" VerticalAlignment="Top" Width="600">
<TabItem Header="Tab1">
<Frame Source="SomeUserControl.xaml" BorderThickness="0" Margin="0" />
</TabItem>
</TabControl>
Here is pseudo code for what I would like to achieve,
<TabControl>
<TabItem Header="Tab1">
<Frame Source="{SomeUserControl.xaml, DataContext=ViewModel1}" />
</TabItem>
<TabItem Header="Tab2">
<Frame Source="{SomeUserControl.xaml, DataContext=ViewModel2}" />
</TabItem>
</TabControl>
Thanks!

Instead of hard coding the tabs, bind to an ObservableCollection of an "item" class. I.e. something like
class MyTabItems : INotifyPropertyChanged
{
public string Header...
public object DataContext...
}
create an:
ObservableCollection<MyTabItems>
Bind the TabControl ItemsSource to the ObservableCollection. In the item template for the TabControl bind the Header to the Header property and the DataContext to the DataContext property. The source can be hardcoded in the template or you can add another property to your item class and bind it to that if you want more flexibility.

Thanks to SledgeHammer's answer I was able to take a different approach and get things working.
<TabControl Name="TabControl" ItemsSource="{Binding TabItems}" HorizontalAlignment="Left" Height="800" Margin="0,0,0,0" VerticalAlignment="Top" Width="600">
<TabControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Header}"/>
</DataTemplate>
</TabControl.ItemTemplate>
<TabControl.ContentTemplate>
<DataTemplate>
<UserControl Content="{Binding DataContext}"/>
</DataTemplate>
</TabControl.ContentTemplate>
TabItems was populated in the code behind associated with the xaml above.
this.TabItems = new ObservableCollection<TabItem>
{
new TabItem("Main", new MainControl()),
new TabItem("Tab1", new GenericTabControl(new ViewModel1())),
new TabItem("Tab2", new GenericTabControl(new ViewModel2()))
};

binding combobox images - how to select saved item in combobox images

I have a Problem with the ComboBox at wpf and xaml. The ItemsSource of my combobox is a list of (CollarTypesImage).
the binding is work fine but the problem when editing data, i can't select the item of my ComboBox.. maybe its selected but the image is not view...
but when click ComboBox, i can see all itams:
http://www.ahmadabouhamdh.com/tmp_global/1.png
i used RelativeSource , nothing changed, ComboBox not selection the my saved item:
<UserControl x:Class="TailorManager.Views.OrderDetailItem"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:vm="clr-namespace:TailorManager.ViewModels"
xmlns:Converter="clr-namespace:TailorManager.Converters"
mc:Ignorable="d"
d:DesignHeight="730" d:DesignWidth="556" FlowDirection="RightToLeft" >
<UserControl.Resources>
<!--<vm:OrderDetailItemViewModel x:Key="OrderDetailItemViewModel1" />-->
<Converter:ImageConverter x:Key="ImgConverter" />
</UserControl.Resources>
<Grid >
<ScrollViewer VerticalScrollBarVisibility="Auto" >
<ItemsControl>
<StackPanel>
<GroupBox Header="تفاصيل الياقة" Margin="5,5,5,0" VerticalAlignment="Top" Height="170">
<Grid>
<ComboBox ItemsSource="{Binding Path= DataContext.ImagesCollarTypes,
RelativeSource={RelativeSource AncestorType=UserControl,AncestorLevel=1}}"
SelectedValue="{Binding Path=OrderDetailItem.CollarTypesImage,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
SelectedValuePath="{Binding Path=OrderDetailItem.CollarTypesImage}"
Margin="393,106,0,0" VerticalAlignment="Top" HorizontalAlignment="Left" Width="132" Height="38">
<ComboBox.ItemTemplate>
<DataTemplate>
<Image Width="50" Height="50" Source="{Binding Path= CollarImage,Converter={StaticResource ImgConverter} }" />
</DataTemplate>
</ComboBox.ItemTemplate >
</ComboBox>
</Grid>
</GroupBox>
<Grid/>
</StackPanel>
</ItemsControl>
</ScrollViewer>
</Grid>
</UserControl>
i added
SelectedItem="{Binding Path=OrderDetailItem.CollarTypesImage}"
and nothing changed.
i use this Control inside window has a different DataContext type,i set the value of (DataContext OrderDetailItem) from constructor of this control.
image below explain the binding is working fine:
this image when click edit to show my saved image from DB, my item not selected:
http://www.ahmadabouhamdh.com/tmp_global/2.png
here all the code:
public List<CollarTypesImage> ImagesCollarTypes
{
get
{
//ImagesCollarTypes[0].CollarImage
if (_imagesCollarTypes.Count == 0)
{
TailorManagerDBEntities db = new TailorManagerDBEntities();
_imagesCollarTypes = db.CollarTypesImages.ToList();
}
return _imagesCollarTypes;
}
set
{
_imagesCollarTypes = value;
RaisePropertyChanged(() => ImagesCollarTypes);
}
}
public partial class CollarTypesImage
{
public CollarTypesImage()
{
this.OrderDetails = new HashSet<OrderDetail>();
}
public System.Guid CollarTypeId { get; set; }
public byte[] CollarImage { get; set; }
public virtual ICollection<OrderDetail> OrderDetails { get; set; }
}
here the xaml code from window i used my control:
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vm="clr-namespace:TailorManager.ViewModels"
xmlns:util="clr-namespace:TailorManagerLib.Business;assembly=TailorManagerLib"
xmlns:local="clr-namespace:TailorManager.Views"
x:Class="TailorManager.Views.AddOrder"
Title="AddCustomer" Height="665" Width="974" MinWidth="600" MinHeight="666" FlowDirection="RightToLeft" >
<Window.Resources>
<vm:ManageOrderDetilsViewModel x:Key="ManageOrderDetilsViewModel1" />
</Window.Resources>
<Grid DataContext="{StaticResource ManageOrderDetilsViewModel1}" x:Name="GridDataContaner">
<Grid.Background>
...
</Grid.Background>
<GroupBox Header="تفاصيل الطلب" Margin="10,160,10,0" FlowDirection="RightToLeft">
<Grid Grid.Column="0" Name="GridOrderDetails">
<Grid.ColumnDefinitions>
<ColumnDefinition Name="ColumnDefinitionListDetails" Width="183*"/>
<ColumnDefinition Name="ColumnDefinitionDetails" Width="0*"/>
</Grid.ColumnDefinitions>
<Grid Margin="0,0,0,40" >
...
</Grid>
<Grid Grid.Column="1">
<Border BorderBrush="Black" BorderThickness="2" CornerRadius="3" Margin="4" >
<Grid>
<local:OrderDetailItem x:Name="OrderDetailItemControl" VerticalAlignment="Top" />
</Grid>
</Border>
</Grid>
...
</Grid>
</GroupBox>
</Grid>
</Window>
how i set the DataContext of the Control, this inside the command in VM of my window:
OrderDetailItemViewModel OrdDetailItem = new OrderDetailItemViewModel(Ord.OrderDetailsId);
OrderDetailItemControl.DataContext = OrdDetailItem;
Please how to fix it??
UPDATE
when i change the relative source as below:
<ComboBox Name="CmbBxImgCollarTyp" ItemsSource="{Binding Path= DataContext.ImagesCollarTypes, RelativeSource={
RelativeSource AncestorType={x:Type vm:OrderDetailItemViewModel}}"
SelectedValue="{Binding Path=OrderDetailItem.CollarTypesImage, Mode=TwoWay,
UpdateSourceTrigger=PropertyChanged}" SelectedValuePath="{Binding Path= OrderDetailItem.CollarTypesImage}" Margin="393,106,0,0" VerticalAlignment="Top"
HorizontalAlignment="Left" Width="132" Height="38">
<ComboBox.ItemTemplate>
<DataTemplate>
<Image Width="50" Height="50" Source="{Binding Path=CollarImage,
Converter={StaticResource ImgConverter}}" />
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
the binding never work at all modes!, i change it to this way cause the datacontext of this control is an object of the viewmodel "OrderDetailItemViewModel"
What should be fix؟؟

You have an error in your RelativeSource Binding Path. You have used the type of UserControl, but the UserControl class does not have a property named ImagesCollarTypes... instead, you should use your UserControl where you defined the property... I'm assuming that class was named OrderDetailItem:
<ComboBox ItemsSource="{Binding Path= DataContext.ImagesCollarTypes, RelativeSource={
RelativeSource AncestorType={x:Type YourViewsPrefix:OrderDetailItem}}}"
SelectedValue="{Binding Path=CollarTypesImage, Mode=TwoWay,
UpdateSourceTrigger=PropertyChanged}" SelectedValuePath="{Binding Path=
CollarTypesImage}" Margin="393,106,0,0" VerticalAlignment="Top"
HorizontalAlignment="Left" Width="132" Height="38">
<ComboBox.ItemTemplate>
<DataTemplate>
<Image Width="50" Height="50" Source="{Binding Path=CollarImage,
Converter={StaticResource ImgConverter}}" />
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
You should have received an error in the Output Window in Visual Studio saying something like Error: property 'ImagesCollarTypes' not found on object 'UserControl' or something similar.
Disclaimer: I didn't go through all of your code because you simply have too much there, so even after you fix this error, your code may still have other errors and not work as expected.
UPDATE >>>
For this Binding to work, the following assumptions were made:
The UserControl.DataContext must have a valid instance of an object set.
The object set as the UserControl.DataContext must have a public property named ImagesCollarTypes.
The ImagesCollarTypes property must be of a type that contains a public property named CollarTypesImage.

after check the Output window, i notes this error:
System.Windows.Data Error: 4 : Cannot find source for binding with
reference 'RelativeSource FindAncestor, AncestorType='Projectname.ViewModels.ViewModel', AncestorLevel='1''. BindingExpression:Path=LookupItems; DataItem=null; target element is 'ComboBox' (Name=''); target property is 'ItemsSource' (type 'IEnumerable')
then i change the RelativeSource from AncestorType from my ViewModel to UserControl, just like this:
RelativeSource={ AncestorType={x:Type UserControl},AncestorLevel=1}}"
and now everything working fine,
Thanks for members make an effort

C# WPF Set Focus TabItem

I have a TabControl and i want to set the focus on the firsttab on a Textbox.
I tried to use in Code:
this.tabItemMerkmalAllgemein.Focus();
this.textBoxMerkmalBezeichnung.Focus();
If the second tab was selected the first Tab will be selected after this but no Cursor at the Textbox is shown, so the Textbox focus dosen't work.
XAML TabControle:
<TabControl Width="359" Grid.Column="1" Style="{StaticResource EditDialogTabControl}" Name="tabControlMerkmalDetails" Margin="4,0,0,0">
<TabItem Header="Allgemein" Name="tabItemMerkmalAllgemein" GotFocus="tabItemMerkmalAllgemein_GotFocus">
…
<Label Grid.Row="0" Style="{StaticResource EditDialogLabel}" Content="Bezeichnung"/>
<TextBox x:Name="textBoxMerkmalBezeichnung" Grid.Row="0" Grid.Column="1"
Style="{StaticResource EditDialogTextBox}" MaxWidth="300"
Text="{Binding Path=bezeichnung, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
TextChanged="textBoxMerkmalBezeichnung_TextChanged" LostFocus="textBoxMerkmalBezeichnung_LostFocus" />
…
</TabItem>
<TabItem Name="tabItemKostenpflichtig">
…
</TabItem>
</TabControl>
</Grid>
</TabItem>

You need to change your declaration of the TabItem to this:
<TabItem FocusManager.FocusedElement="{Binding ElementName=textBoxMerkmalBezeichnung}"
Header="Allgemein" Name="tabItemMerkmalAllgemein" GotFocus="tabItemMerkmalAllgemein_GotFocus">
The important part is the addition of the FocusManager.FocusedElement attached property. You can find out more from the FocusManager.FocusedElement Attached Property page at MSDN.

Caliburn Micro: UserControl Binding

I use Caliburn Micro for my WPF application. I implemented a little UserControl:
<UserControl Name="ImageButtonUserControl"
x:Class="SportyMate.Utility.Controls.ImageButton"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006">
<Grid>
<Button>
<StackPanel Orientation="Horizontal">
<Image Source="{Binding ElementName=ImageButtonUserControl, Path=Image}" />
<TextBlock Text="{Binding ElementName=ImageButtonUserControl, Path=Text}" />
</StackPanel>
</Button>
</Grid>
</UserControl>
Now I want to use these Control in my view:
<uc:ImageButton Name="Cancel" Image="/Images/Icons/cancel_16x16.png" Text="Abbrechen" Margin="3" />
When I want to open my view (in my case it's opened as a dialog) it doesn't work. The View does not openend.
When I remove the Name-Attribute everthing is fine, but the Button have no binding to an action. Can anyone tell me what I have to do for a correct binding? A regular Button worked.

You are on a completely wrong way. You shouldn't create a user control for such a simple modification. You need to create a DataTemplate and use it for a Button.ContentTemplate. First you need to define a helper type for button content:
public class ImageButtonContent
{
public BitmapImage Image { get; set; }
public string Label { get; set; }
}
After that you can use it for DataTemplate:
<Window x:Class="Trys.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:Trys="clr-namespace:Trys"
Title="MainWindow"
Height="350"
Width="525">
<Window.Resources>
<Trys:ImageButtonContent x:Key="YourImageButtonHere"
Label="Your ImageButtonHere">
<Trys:ImageButtonContent.Image>
<BitmapImage UriSource="your-icon.png" />
</Trys:ImageButtonContent.Image>
</Trys:ImageButtonContent>
<DataTemplate x:Key="ImageButton"
DataType="{x:Type Trys:ImageButtonContent}">
<StackPanel Orientation="Horizontal">
<Image Source="{Binding Image}"
Margin="5" />
<TextBlock Text="{Binding Label}"
VerticalAlignment="Center"
Margin="10,0,0,0" />
</StackPanel>
</DataTemplate>
</Window.Resources>
<Grid>
<Button ContentTemplate="{StaticResource ImageButton}"
Content="{StaticResource YourImageButtonHere}"
Height="50"
Width="250" />
</Grid>
</Window>
I used a resource for an object, but you can use a property on your ViewModel. The result is:
And this just a normal button. You can use for it all power of Caliburn.Micro conventions like Click event default binding. Enjoy!