Develop Reference

WPF - How to trigger an event for each element(button) in a ListBox?

I'd like to trigger event for the elemens which is button in a listbox, the view is as below. It is a listbox with 32 buttons.The purpose is to toggle the button between 0-1 and trigger event for each element.
There are two solutions I am thinking about. The solution one is to set command for each button, it works but the problem is I can't catch a selectedItem or a selectedIndex successfully so that even thougn I know the button is toggled, but I don't know the item index.
<ListBox x:Name="lbDirection"
Grid.Row="1"
Grid.Column="1"
SelectionMode="Extended"
ScrollViewer.HorizontalScrollBarVisibility="Disabled"
ScrollViewer.VerticalScrollBarVisibility="Disabled"
Margin="30,26,44,83"
Style="{StaticResource ListBoxHorz}"
ItemContainerStyle="{StaticResource ItemNoBorder}"
SelectedItem="{Binding SelectedLineItem}"
ItemsSource="{Binding ButtonList}"
IsSynchronizedWithCurrentItem="True">
<ListBox.ItemTemplate>
<DataTemplate>
<Button Style="{StaticResource ChangeButton}"
Command="{Binding DataContext.ToggleDirectionCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType= ListBox}}">
<Button.Content>
<TextBlock Text="{Binding BtnText}"
TextDecorations="Underline" />
</Button.Content>
</Button>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
ViewModel:
public class DigitalIOViewModel : BindableBase
{
public ICommand ToggleDirectionCommand { get; set; }
public ICommand ToggleStateCommand { get; set; }
private ObservableCollection<LineButtons> btnlist;
private LineButtons _selectedLineItem;
public LineButtons SelectedLineItem
{
get { return _selectedLineItem; }
set {
_selectedLineItem=value;
OnPropertyChanged("SelectedLineItem");
}
}
public DigitalIOViewModel()
{
btnlist = new ObservableCollection<LineButtons>();
CreateButtonList();
ToggleDirectionCommand = new RelayCommand(ToggleDirectionAction);
}
private void ToggleDirectionAction()
{
LineButtons selectedLineItem = SelectedLineItem;
int lineIndex=(SelectedLineItem!= null && ButtonList!=null)? ButtonList.IndexOf(SelectedLineItem) : -1;
if (selectedLineItem.BtnText == "1" && lineIndex == 0)
{
ButtonList[lineIndex] = new LineButtons() { BtnText = "0" };
}
else
ButtonList[lineIndex] = new LineButtons() { BtnText = "1" };
}
public ObservableCollection<LineButtons> ButtonList
{
get { return btnlist; }
set { btnlist = value; OnPropertyChanged("ButtonList"); }
}
public void CreateButtonList()
{
for (int i = 0; i < 32; i++)
{
ButtonList.Add(new LineButtons() { BtnText = "1"});
}
}
}
public class LineButtons : BindableBase
{
private string btnText;
public string BtnText
{
get { return btnText; }
set { btnText = value; OnPropertyChanged("BtnText"); }
}
}
I cannot get a correct selectedIndex from this code.
The second solution is to use the IsSelected/SelectedItem property instead of button command binding, I was wondering if there is conflict with the button command binding for item and IsSelected property fot listbox,so we can't use them at the same time, can someone help me out which is the best solution? Thanks in advance.

In addition to the Command property you can set the CommandParameter to the current LineButtons item (class names should be singular, names of collections use plural):
<ListBox.ItemTemplate>
<DataTemplate>
<Button Style="{StaticResource ChangeButton}"
Command="{Binding DataContext.ToggleDirectionCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType= ListBox}}"
CommandParameter="{Binding}">
<Button.Content>
<TextBlock Text="{Binding BtnText, UpdateSourceTrigger=PropertyChanged}"
TextDecorations="Underline" />
</Button.Content>
</Button>
</DataTemplate>
</ListBox.ItemTemplate>
Then get the current item, the item that triggered the command, by accessing the command parameter:
private void Execute(object commandParameter)
{
var currentLineButton = commandParameter as LineButtons;
...
}

WPF Tabcontrol (TabItem Content is not appearing)

I implemented a TabControl with Closable TabItems in my App. For this, I am using a Collection which I fill with the SubMenuItems of MenuItem "Öffne", which are bound to ICommands in the MainViewModel.
So if I click on MenuItem "Open Tab1", then the header of Tab 1 is created, but I can not see any content. The content of the TabItem is shown AFTER I click on the Header of the TabItem. But I want it to be shown directly when the TabItem is "created" without any need of clicking on the header. Closing the TabItems from the "X" button works fine.
I looked at a couple of examples and tried a ContentTemplate, but it didn't work (Maybe I made something wrong?).
I Hope you can tell me what i have done wrong or show me a good example.
Thanks in advance!
Here are my code snippets:
MainWindow.XAML:
<Window.Resources>
<vm:MainViewModel x:Key="viewModel"/>
</Window.Resources>
<TabControl Background="#FFE5E5E5" ItemsSource="{Binding TabControlViews}" SelectedItem="{Binding CurrentTabItem}" Margin="0,21,0,0">
<TabControl.ItemTemplate>
<DataTemplate>
<DockPanel Width="120">
<TextBlock Text="{Binding Header}"/>
<Button
Command="{Binding ParameterizedCommand, Source={StaticResource viewModel}}"
CommandParameter="{Binding Header, RelativeSource={RelativeSource AncestorType={x:Type TabItem}}}"
Content="X"
Cursor="Hand"
DockPanel.Dock="Right"
Focusable="False"
FontFamily="Courier"
FontSize="9"
FontWeight="Bold"
Margin="0,1,0,0"
Padding="0"
VerticalContentAlignment="Bottom"
Width="16" Height="16" />
<ContentPresenter
Content="{Binding Path=DisplayName}"
VerticalAlignment="Center" />
</DockPanel>
</DataTemplate>
</TabControl.ItemTemplate>
<!--<TabControl.ContentTemplate>
<DataTemplate>
</DataTemplate>
</TabControl.ContentTemplate>-->
<TabControl.Resources>
<DataTemplate x:Name="test" DataType="{x:Type vm:MenueVM}">
<cu:MenueSearch/>
</DataTemplate>
<DataTemplate DataType="{x:Type vm:FieldPointsVM}">
<cu:FieldPointsSearch/>
</DataTemplate>
<DataTemplate DataType="{x:Type vm:DataTransferVM}">
<cu:DataTransfer/>
</DataTemplate>
</TabControl.Resources>
</TabControl>
MainWindow.cs:
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
var vm = (MainViewModel)Resources["viewModel"];
this.DataContext = vm;
}
}
MainViewModel.cs:
public MainViewModel()
{
TabControlViews = new ObservableCollection<BaseViewModel>();
_menueVM = new MenueVM("Menüpunkte", "Menue");
_fieldVM = new FieldPointsVM("Feldpunkte", "FieldPoint");
_dataVM = new DataTransferVM("DatenTransfer", "DataTransfer");
ParameterizedCommand = new RelayCommand(DoParameterizedCommand);
}
private void DoParameterizedCommand(object parameter)
{
if (parameter.ToString() == "App.ViewModel.MenueVM")
{
TabControlViews.Remove(_menueVM);
}
else if (parameter.ToString() == "App.ViewModel.FieldPointsVM")
{
TabControlViews.Remove(_fieldVM);
}
else if (parameter.ToString() == "App.ViewModel.DataTransfer")
{
TabControlViews.Remove(_dataVM);
}
}
private ICommand _parameterizedCommand;
public ICommand ParameterizedCommand
{
get
{
return _parameterizedCommand;
}
set
{
_parameterizedCommand = value;
}
}
private TabItem _propCurrentTabItem;
public TabItem CurrentTabItem
{
get
{
return _propCurrentTabItem;
}
set
{
_propCurrentTabItem = value;
}
}
private ObservableCollection<BaseViewModel> _TabControlViews = new ObservableCollection<BaseViewModel>();
public ObservableCollection<BaseViewModel> TabControlViews
{
get
{
return _TabControlViews;
}
set
{
_TabControlViews = value;
OnPropertyChanged();
}
}
public ICommand OpenMenupunkteCommand
{
get
{
return new BaseCommand(OpenMenuPunkte);
}
}
public ICommand OpenFeldpunkteCommand
{
get
{
return new BaseCommand(OpenFeldpunkte);
}
}
public ICommand OpenDataTransferCommand
{
get
{
return new BaseCommand(OpenDataTransfer);
}
}
private void OpenMenuPunkte()
{
if (!TabControlViews.Contains(_menueVM))
{
TabControlViews.Add(_menueVM);
}
}
private void OpenFeldpunkte()
{
if (!TabControlViews.Contains(_fieldVM))
{
TabControlViews.Add(_fieldVM);
}
}
private void OpenDataTransfer()
{
if (!TabControlViews.Contains(_dataVM))
{
TabControlViews.Add(_dataVM);
}
}
MenueVM.cs
public class MenueVM : BaseViewModel
{
public MenueVM()
{
//Here are some actions done for Data, but I think they are unimportant for this question
}
public MenueVM(string header, string content)
{
Header = header;
Content = content;
}
private string _header;
public string Header
{
get
{
return _header;
}
set
{
_header = value;
}
}

Still time to post an answer?
Try this :
XAML:
<TabControl ItemsSource="{Binding....}" IsSynchronizedWithCurrentItem="True">
<!-- style, template, ... -->
</TabControl>
CS:
//Adding your viewModel to your ObservableCollection<> TabControlViews
TabControlViews.Add(_viewModelToAdd);
ICollectionView collectionView = CollectionViewSource.GetDefaultView(TabControlViews);
if (collectionView != null)
{
collectionView.MoveCurrentTo(_viewModelToAdd);
//And this is because you don't want your tabItem to be selected :
collectionView.MoveCurrentToPrevious();
}
Found in the downloadable DemoMVVMApp here : https://msdn.microsoft.com/en-us/magazine/dd419663.aspx#id0090030
I've also spent a huge amount of time to solve this problem... ;-)

The problem is that your tab is been created, but it´s not been selected. So, in addition to calling
TabControlViews.Add(_dataVM)
, you should also update your CurrentTabItem
CurrentTabItem = _dataVM;
and bind your TabControl SelectedItem property to your CurrentTabItem, like this:
<TabControl ItemsSource="{Binding TabControlViews}" SelectedItem="{Binding CurrentTabItem}">
Also, if you remove a TabItem and want to get back to the last one, you have to call
CurrentTabItem = TabControlViews.LastOrDefault();

How to call Command from MVVM binding

I have below code to bind ListBox data using MVVM. I would like to implment the Command from MVVM, data is binded completely and I don't know why it doesn't work with the Command. I don't receive the message when clicking on the button.
ViewModel
public class BookmarkViewModel : INotifyPropertyChanged
{
public BookmarkViewModel()
{
DataSource ds = new DataSource();
deleteBookmark = new Command(executeCommand) { Enabled = true };
_bk = ds.getBookmarkDetail();
}
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
List<BookmarkDetail> _bk;
public List<BookmarkDetail> Bookmarks
{
get { return _bk; }
set
{
if (_bk != value)
{
_bk = value;
OnPropertyChanged("Bookmarks");
}
}
}
private Command deleteBookmark;
public Command DeleteBookmark
{
get
{
return deleteBookmark;
}
set
{
deleteBookmark = value;
}
}
void executeCommand()
{
System.Windows.MessageBox.Show(_bk[0].SuraName);
}
public class Command : ICommand
{
private readonly Action executeAction;
private bool enabled;
public bool Enabled
{
get
{
return enabled;
}
set
{
if (enabled != value)
{
enabled = value;
if (CanExecuteChanged != null)
CanExecuteChanged(this, new EventArgs());
}
}
}
public Command(Action executeAction)
{
this.executeAction = executeAction;
}
public bool CanExecute(object parameter)
{
return enabled;
}
public event EventHandler CanExecuteChanged;
public void Execute(object parameter)
{
executeAction();
}
}
}
and XAML binding
<ListBox x:Name="lsbBookmarks" FontFamily="./Fonts/ScheherazadeRegOT.ttf#Scheherazade"
FlowDirection="RightToLeft"
Style="{StaticResource ListBoxStyle1}"
ItemsSource="{Binding Bookmarks}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel HorizontalAlignment="Stretch">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="60"></ColumnDefinition>
</Grid.ColumnDefinitions>
<StackPanel Orientation="Horizontal" Grid.Column="0"
HorizontalAlignment="Stretch">
<TextBlock Padding="20,0,10,0" HorizontalAlignment="Stretch">
<Run FontSize="50" Text="{Binding ArabicText.ArabicAyaNumber}"
FontFamily="./Fonts/KPGQPC.otf#KFGQPC Uthmanic Script HAFS"
Foreground="Blue"/> <Run FontSize="30" Text="{Binding ArabicText.Aya}"/>
</TextBlock>
</StackPanel>
<Button Grid.Column="1" Tag="{Binding ArabicText.ArabicTextID}"
VerticalAlignment="Center"
Height="60" Width="50" HorizontalAlignment="Right"
Content="X" BorderBrush="Red"
Background="Red" BorderThickness="0"
Padding="0" Command="{Binding DeleteBookmark}"></Button>
</Grid>
<Line X1="0" X2="1" Y1="0" Y2="0" Stretch="Fill" VerticalAlignment="Bottom"
StrokeThickness="1" Stroke="LightGray" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
Any Ideas, How to implement the Command using MVVM?
Thanks!

If I were you I would:
Move the Command implementation to a separate file or declare it outside the scope of the BookmarkViewModel class.
Use the second option as ig2r suggested. Your binding would look like this:Command="{Binding DataContext.DeleteBookmark, ElementName=lsbBookmarks}" You can also use any other ElementName other than lsbBookmarks that's defined as a parent of the ListBox.

It appears that your DeleteBookmark command is exposed as a property on the BookmarkViewModel class, whereas the actual data context within the DataTemplate used to render individual ListBox items will be an instance of BookmarkDetail. Since BookmarkDetail does not declare a DeleteBookmark command, the binding fails.
To correct this, either:
Define and expose the DeleteBookmark command on the BookmarkDetail class, or
Extend your command binding to tell the binding system where to look for the delete command, e.g., Command="{Binding DataContext.DeleteBookmark, ElementName=lsbBookmarks}" (untested).

Wpf MVVM - Tabbed interface is not working as expected

First: I am new to MVVM and WPF.
I am trying to create a little application with a tabbed user interface. Users can create products and storage locations, using a button which should open a new TabItem.
My code in the view looks like this:
<TabControl ItemsSource="{Binding Workspaces}"
IsSynchronizedWithCurrentItem="True"
Margin="3"
DockPanel.Dock="Top">
<TabControl.ItemTemplate>
<DataTemplate>
<Label Content="{Binding DisplayName}" />
</DataTemplate>
</TabControl.ItemTemplate>
</TabControl>
and the View Model is this:
ObservableCollection<WorkspaceViewModel> _workspaces;
public ObservableCollection<WorkspaceViewModel> Workspaces
{
get
{
if (_workspaces == null)
{
_workspaces = new ObservableCollection<WorkspaceViewModel>();
}
return _workspaces;
}
set
{
_workspaces = value;
}
}
public void AddProduct(object obj)
{
Workspaces.Add(new ProductViewModel());
}
Various other buttons add different ViewModels to the Workspaces Collection.
I have defined multiple Data Template (one for each ViewModel). Here is one:
<DataTemplate DataType="{x:Type vm:ProductViewModel}">
<vw:ProductView />
</DataTemplate>
The WorkspaceViewModel is this:
namespace Inventory.Desktop.ViewModels
{
public abstract class WorkspaceViewModel : INotifyPropertyChanged
{
#region Events and EventHandlers
public event PropertyChangedEventHandler PropertyChanged;
protected void NotifyPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
}
and eg the ProductViewModel
namespace Inventory.Desktop.ViewModels
{
public class ProductViewModel: WorkspaceViewModel
{
private Product _product;
private string _displayName;
public string DisplayName
{
get
{
if (String.IsNullOrEmpty(_displayName))
{
return "Neues Produkt";
} else
{
return _displayName;
}
}
set
{
_displayName = value;
NotifyPropertyChanged("DisplayName");
}
}
#region Public Properties
public Product Product
{
get
{
return _product;
}
set
{
_product = value;
NotifyPropertyChanged("Product");
}
}
public string Title
{
get
{
return _product.Title;
}
set
{
_product.Title = value;
NotifyPropertyChanged("Title");
}
}
public string ScanCode
{
get
{
return _product.ScanCode;
}
set
{
_product.ScanCode = value;
NotifyPropertyChanged("ScanCode");
}
}
public string Manufacturer
{
get
{
return _product.Manufacturer;
}
set
{
_product.Manufacturer = value;
NotifyPropertyChanged("Manufacturer");
}
}
public string ManufacturerNumber
{
get
{
return _product.ManufacturerNumber;
}
set
{
_product.ManufacturerNumber = value;
NotifyPropertyChanged("ManufacturerNumber");
}
}
public string Description
{
get
{
return _product.Description;
}
set
{
_product.Description = value;
NotifyPropertyChanged("Description");
}
}
#endregion
#region Commands
private ICommand _saveCommand;
public ICommand SaveCommand
{
get
{
return _saveCommand;
}
set
{
_saveCommand = value;
}
}
#endregion
#region Command Executions
public void Save(object obj)
{
using (var db = new InvContext())
{
db.Products.Attach(Product);
db.Entry(Product).State = Product.ProductId == 0 ?
EntityState.Added : EntityState.Modified;
db.SaveChanges();
}
MessageBox.Show("Product saved: " + Product.Title);
}
#endregion
#region Constructors
public ProductViewModel()
{
if (_product == null)
{
_product = new Product();
}
SaveCommand = new RelayCommand(new Action<object>(Save));
}
#endregion
}
}
Here the ProductView.xaml view:
<UserControl x:Class="Inventory.Desktop.Views.ProductView"
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"
mc:Ignorable="d"
d:DesignHeight="400" d:DesignWidth="450">
<DockPanel>
<StackPanel DockPanel.Dock="Top" Orientation="Horizontal" FlowDirection="RightToLeft">
<Button Name="SaveProductButton" Command="{Binding SaveCommand}" Content="Speichern" Margin="3" BorderThickness="0">
</Button>
</StackPanel>
<StackPanel DockPanel.Dock="Top" VerticalAlignment="Stretch">
<Label Content="Scan Code" />
<TextBox Text="{Binding Path=ScanCode}" HorizontalAlignment="Stretch" Margin="3" Padding="3" Height="50" TextAlignment="Right">
<TextBox.Background>
<ImageBrush ImageSource="..\Images\Barcode32.png" AlignmentX="Left" Stretch="None" />
</TextBox.Background>
</TextBox>
<Label Content="Bezeichnung" />
<TextBox Text="{Binding Path=Title, UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Stretch" Margin="3" />
<Label Content="Hersteller" />
<TextBox Text="{Binding Path=Manufacturer, UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Stretch" Margin="3" />
<Label Content="Hersteller Nummer" />
<TextBox Text="{Binding Path=ManufacturerNumber, UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Stretch" Margin="3" />
<Label Content="Beschreibung / Information" />
<TextBox Text="{Binding Path=Description, UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Stretch" Margin="3" />
</StackPanel>
</DockPanel>
</UserControl>
and here the code-behind ProductView.xaml.cs:
namespace Inventory.Desktop.Views
{
/// <summary>
/// Interaktionslogik für ProductView.xaml
/// </summary>
public partial class ProductView : UserControl
{
ProductViewModel _productModel = new ProductViewModel();
public ProductView()
{
InitializeComponent();
base.DataContext = _productModel;
}
}
}
What's currently working:
When I click a button, I got a new TabItem displaying the correct view and all commands work correctly.
What's not working:
When I open a TabItem, enter some information, and then I open another TabItem with a different ViewModel, switching the focus to the new TabItem and then back to the original oen, then all entered information are gone (object is null).
When I open a TabItem, enter some information, and then I open another TabItem with the same ViewModel, then both TabItems show the the same information.
When I add a new TabItem, it doesn't get focus.
I am totally lost and I hope you can tell me what I am doing wrong.
Best
Stefan

Have a property on your ViewModel to store the reference to current/selected tab
public WorkspaceViewModel SelectedTab
{
get { return _selectedTab; }
set
{
_selectedTab = value;
RaisePropertyChanged(() => SelectedTab);
}
}
and bind this to SelectedItem property on TabControl.
<TabControl ItemsSource="{Binding Workspaces}"
SelectedItem="{Binding SelectedTab, Mode=TwoWay}"
Margin="3"
DockPanel.Dock="Top">
<TabControl.ItemTemplate>
<DataTemplate>
<Label Content="{Binding DisplayName}" />
</DataTemplate>
</TabControl.ItemTemplate>
</TabControl>
And finally, you want to update SelectedTab property whenever you are adding a new tab. Modify your AddProduct like this:
public void AddProduct(object obj)
{
var workspace = new ProductViewModel();
Workspaces.Add(workspace);
SelectedTab = workspace;
}

How to move items in a Grid

I've got a WPF Grid and would like to move rows up or down depending on the user's input. This is what I've tried so far (an example for when the user decides to move an element up):
RowDefinition currentRow = fieldsGrid.RowDefinitions[currentIndex];
fieldsGrid.RowDefinitions.Remove(currentRow);
fieldsGrid.RowDefinitions.Insert(currentIndex - 1, currentRow);
Am I doing something wrong? As the UI remains the same using this approach.

This would be the WPF approach to what you're screenshot looks like:
<Window x:Class="WpfApplication4.Window9"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window9" Height="300" Width="500">
<ItemsControl ItemsSource="{Binding Columns}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<DataTemplate.Resources>
<BooleanToVisibilityConverter x:Key="BoolToVisConverter"/>
</DataTemplate.Resources>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="20"/>
<ColumnDefinition Width="50"/>
<ColumnDefinition/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="25"/>
<ColumnDefinition Width="25"/>
</Grid.ColumnDefinitions>
<!-- This is your Key image, I used a rectangle instead, you can change it -->
<Rectangle Fill="Yellow" Visibility="{Binding IsPrimaryKey, Converter={StaticResource BoolToVisConverter}}" Margin="2"/>
<CheckBox IsChecked="{Binding IsSelected}" Grid.Column="1"/>
<TextBlock Text="{Binding Name}" Grid.Column="2"/>
<ComboBox ItemsSource="{Binding SortOrders}" SelectedItem="{Binding SortOrder}" Grid.Column="3" Margin="2"/>
<Button Content="Up" Grid.Column="4" Margin="2"
Command="{Binding DataContext.MoveUpCommand, RelativeSource={RelativeSource FindAncestor, AncestorType=ItemsControl}}"
CommandParameter="{Binding}"/>
<Button Content="Down" Grid.Column="5" Margin="2"
Command="{Binding DataContext.MoveDownCommand, RelativeSource={RelativeSource FindAncestor, AncestorType=ItemsControl}}"
CommandParameter="{Binding}"/>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Window>
Code Behind:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using InduraClientCommon.MVVM;
using System.Collections.ObjectModel;
namespace WpfApplication4
{
public partial class Window9 : Window
{
public Window9()
{
InitializeComponent();
var vm = new ColumnListViewModel();
vm.Columns.Add(new ColumnViewModel() { IsPrimaryKey = true, Name = "Customer ID", SortOrder = SortOrder.Ascending });
vm.Columns.Add(new ColumnViewModel() {Name = "Customer Name", SortOrder = SortOrder.Descending});
vm.Columns.Add(new ColumnViewModel() {Name = "Customer Age", SortOrder = SortOrder.Unsorted});
DataContext = vm;
}
}
}
ViewModel:
public class ColumnListViewModel: ViewModelBase
{
private ObservableCollection<ColumnViewModel> _columns;
public ObservableCollection<ColumnViewModel> Columns
{
get { return _columns ?? (_columns = new ObservableCollection<ColumnViewModel>()); }
}
private DelegateCommand<ColumnViewModel> _moveUpCommand;
public DelegateCommand<ColumnViewModel> MoveUpCommand
{
get { return _moveUpCommand ?? (_moveUpCommand = new DelegateCommand<ColumnViewModel>(MoveUp, x => Columns.IndexOf(x) > 0)); }
}
private DelegateCommand<ColumnViewModel> _moveDownCommand;
public DelegateCommand<ColumnViewModel> MoveDownCommand
{
get { return _moveDownCommand ?? (_moveDownCommand = new DelegateCommand<ColumnViewModel>(MoveDown, x => Columns.IndexOf(x) < Columns.Count)); }
}
private void MoveUp(ColumnViewModel item)
{
var index = Columns.IndexOf(item);
Columns.Move(index, index - 1);
MoveUpCommand.RaiseCanExecuteChanged();
MoveDownCommand.RaiseCanExecuteChanged();
}
private void MoveDown(ColumnViewModel item)
{
var index = Columns.IndexOf(item);
Columns.Move(index, index + 1);
MoveUpCommand.RaiseCanExecuteChanged();
MoveDownCommand.RaiseCanExecuteChanged();
}
}
public class ColumnViewModel: ViewModelBase
{
private bool _isPrimaryKey;
public bool IsPrimaryKey
{
get { return _isPrimaryKey; }
set
{
_isPrimaryKey = value;
NotifyPropertyChange(() => IsPrimaryKey);
}
}
private bool _isSelected;
public bool IsSelected
{
get { return _isSelected; }
set
{
_isSelected = value;
NotifyPropertyChange(() => IsSelected);
}
}
private string _name;
public string Name
{
get { return _name; }
set
{
_name = value;
NotifyPropertyChange(() => Name);
}
}
private List<SortOrder> _sortOrders;
public List<SortOrder> SortOrders
{
get { return _sortOrders ?? (_sortOrders = Enum.GetValues(typeof(SortOrder)).OfType<SortOrder>().ToList()); }
}
private SortOrder _sortOrder;
public SortOrder SortOrder
{
get { return _sortOrder; }
set
{
_sortOrder = value;
NotifyPropertyChange(() => SortOrder);
}
}
}
public enum SortOrder {Unsorted, Ascending, Descending}
}
This is what it looks like in my screen:
As you can see in the above example, I am in no way manipulating or creating UI elements in code, because it's actually not necessary. Whenever you need to interact with the pieces of information displayed in the screen, you interact with the ViewModels and not the View. This is the clear separation of concerns between UI and application logic WPF makes possible, which is utterly absent in other frameworks. Please consider this approach the de-facto default when doing any kind o N-element UIs in WPF.
Edit:
Advantages of this approach versus the classic one:
No need to manipulate complex WPF classes (I.E UI elements) in your code in order to show / get data from screen (just simple, simple
properties and INotifyPropertyChanged)
Scales better (UI can be anything as long as it honors the ViewModel properties, you could change the ComboBox to a rotating 3d
pink elephant with a Sort order in each foot.
No need to navigate the visual tree to find elements located God knows where.
No need to foreach anything. Just a simple Select that converts your data (from whatever data source you obtained it) to the
ViewModel list.
Bottom line: WPF is much simpler and nicer than anything else currently in existence, if you use the WPF approach.

Here is a quick example of using an ItemsControl to do what you are wanting:
ViewModel
public class ListBoxViewModel
{
private static readonly List<string> sortList = new List<string>() { "Unsorted", "Sorted" };
public List<string> SortList { get { return sortList; } }
public ObservableCollection<ItemDetail> ItemDetails { get; set; }
#region Up Command
ICommand upCommand;
public ICommand UpCommand
{
get
{
if (upCommand == null)
{
upCommand = new RelayCommand(UpExecute);
}
return upCommand;
}
}
private void UpExecute(object param)
{
var id = param as ItemDetail;
if (id != null)
{
var curIndex = ItemDetails.IndexOf(id);
if (curIndex > 0)
ItemDetails.Move(curIndex, curIndex - 1);
}
}
#endregion Up Command
#region Down Command
ICommand downCommand;
public ICommand DownCommand
{
get
{
if (downCommand == null)
{
downCommand = new RelayCommand(DownExecute);
}
return downCommand;
}
}
private void DownExecute(object param)
{
var id = param as ItemDetail;
if (id != null)
{
var curIndex = ItemDetails.IndexOf(id);
if (curIndex < ItemDetails.Count-1)
ItemDetails.Move(curIndex, curIndex + 1);
}
}
#endregion Down Command
public ListBoxViewModel()
{
ItemDetails = new ObservableCollection<ItemDetail>()
{
new ItemDetail() { IsSelected = false, ItemName = "Customer Id", SortOrder = "Unsorted" },
new ItemDetail() { IsSelected = true, ItemName = "Customer Name", SortOrder = "Sorted" },
new ItemDetail() { IsSelected = false, ItemName = "Customer Age", SortOrder = "Unsorted" }
};
}
}
ItemDetail Class (Made up by me to make things easier)
public class ItemDetail
{
public bool IsSelected { get; set; }
public string ItemName { get; set; }
public string SortOrder { get; set; }
}
XAML
<UserControl.Resources>
<DataTemplate DataType="{x:Type vm:ItemDetail}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition SharedSizeGroup="CheckBoxGroup" />
<ColumnDefinition SharedSizeGroup="ItemNameGroup" />
<ColumnDefinition SharedSizeGroup="SortGroup" />
<ColumnDefinition Width="20" />
<ColumnDefinition SharedSizeGroup="UpArrowGroup" />
<ColumnDefinition SharedSizeGroup="DownArrowGroup" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<CheckBox Grid.Column="0" IsChecked="{Binding IsSelected}" VerticalAlignment="Center" />
<Label Grid.Column="1" Content="{Binding ItemName}" />
<ComboBox Grid.Column="2" ItemsSource="{Binding DataContext.SortList, RelativeSource={RelativeSource AncestorType={x:Type views:ListBoxExample}}}" SelectedItem="{Binding SortOrder}" />
<Button Grid.Column="4" Command="{Binding DataContext.UpCommand, RelativeSource={RelativeSource AncestorType={x:Type views:ListBoxExample}}}" CommandParameter="{Binding}">
<Image Source="..\images\up.png" Height="10" />
</Button>
<Button Grid.Column="5" Command="{Binding DataContext.DownCommand, RelativeSource={RelativeSource AncestorType={x:Type views:ListBoxExample}}}" CommandParameter="{Binding}">
<Image Source="..\images\down.png" Height="10" />
</Button>
</Grid>
</DataTemplate>
</UserControl.Resources>
<Grid Grid.IsSharedSizeScope="True">
<ItemsControl ItemsSource="{Binding ItemDetails}" />
</Grid>
And finally the results:
And after pressing the down arrow on the first item:
Hope this helps.

You are changing the order of the RowDefinitions, which is not what you want. You want to change the assignment of elements to rows, which is determined by the Grid.Row attached property
I would put all controls that belong to each row in a container (one per row) and then use Grid.SetRow to change the containers around. See how to change the grid row of the control from code behind in wpf.