spieleprogrammierer.de - Forum und Wiki zur Spieleprogrammierung und Spieleentwicklung

Quellcode

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:MultiItems" x:Class="MultiItems.MainWindow"
        Title="MainWindow" Height="350" Width="200">
    <Window.DataContext>
        <local:MainWindowModel/>
    </Window.DataContext>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="20"/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <Button Grid.Row="0" Command="{Binding AddCommand}" Content="New Mail"/>

        <ScrollViewer Grid.Row="1">
            <ItemsControl HorizontalAlignment="Stretch" VerticalAlignment="Stretch" ItemsSource="{Binding MailItems}">
                <ItemsControl.ItemTemplate>
                    <DataTemplate>
                        <local:MailItemView DataContext="{Binding}"/>
                    </DataTemplate>
                </ItemsControl.ItemTemplate>
            </ItemsControl>
        </ScrollViewer>
    </Grid>
</Window>

C#-Quelltext

using System;
using System.Collections.ObjectModel;
using System.Windows.Input;

namespace MultiItems
{
    internal class MainWindowModel
    {
        private readonly ICommand _addCommand;

        public MainWindowModel()
        {
            _addCommand = new CommandHandler(ExecuteAdd);
        }

        public ICommand AddCommand
        {
            get { return _addCommand; }
        }

        private readonly ObservableCollection<MailItemViewModel> _mailItems = new ObservableCollection<MailItemViewModel>();
        public ObservableCollection<MailItemViewModel> MailItems
        {
            get { return _mailItems; }
        }

        private void ExecuteAdd()
        {
            MailItems.Add(new MailItemViewModel(OnDeleteMail) {Name = string.Empty, EMail = "foo@bar.de"});
        }

        private void OnDeleteMail(object sender, EventArgs eventArgs)
        {
            var mail = sender as MailItemViewModel;
            if (mail == null)
                return;
            _mailItems.Remove(mail);
        }
    }
}

Quellcode

<UserControl x:Class="MultiItems.MailItemView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Grid Margin="5">
         <Grid.ColumnDefinitions>
             <ColumnDefinition/>
             <ColumnDefinition/>
         </Grid.ColumnDefinitions>   
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <Label Grid.Column="0" Grid.Row="0" Content="Name: "/>
        <TextBox  Grid.Column="1" Grid.Row="0" Text="{Binding Name}" Margin="2"/>
        <Label Grid.Column="0" Grid.Row="1" Content="Mail: "/>
        <TextBox  Grid.Column="1" Grid.Row="1" Text="{Binding EMail}" Margin="2"/>
        <Button Height="20" Grid.ColumnSpan="2" Grid.Row="2" Margin="2" Content="Delete" Command="{Binding DeleteCommand}"/>
    </Grid>
</UserControl>

C#-Quelltext

using System;
using System.Windows.Input;

namespace MultiItems
{
    class MailItemViewModel
    {
        private readonly EventHandler<EventArgs> _onDeleteRequest;
        private readonly ICommand _deleteCommand;

        public MailItemViewModel(EventHandler<EventArgs> onDeleteRequest)
        {
            _onDeleteRequest = onDeleteRequest;
            _deleteCommand =
                new CommandHandler(() => { if (_onDeleteRequest != null) _onDeleteRequest(this, new EventArgs()); });
        }

        public string Name { get; set; }

        public string EMail { get; set; }

        public ICommand DeleteCommand
        {
            get { return _deleteCommand; }
        }
    }
}

C#-Quelltext

using System;
using System.Windows.Input;

namespace MultiItems
{
    public class CommandHandler : ICommand
    {
        private readonly Action _action;
        private readonly bool _canExecute;

        public CommandHandler(Action action, bool canExecute = true)
        {
            _action = action;
            _canExecute = canExecute;
        }

        public bool CanExecute(object parameter)
        {
            return _canExecute;
        }

        public event EventHandler CanExecuteChanged;

        public void Execute(object parameter)
        {
            if(_action != null)
                _action();
        }
    }
}

C#-Quelltext

protected void SetPropertyValue<T>(string propertyName, ref T backingField, T value)
{
    if (Equals(backingField, value) return;
    backingField = value;
    OnPropertyChanged(propertyName);
}

C#-Quelltext

public string Name 
{
    get { return _name; }
    set { SetPropertyValue("Name", ref _name, value); }
}

Quellcode

<ResourceDictionary>
    <DataTemplate DataType="{x:Type MyViewModelType}">
        <!-- Mein View -->
    </DataTemplate>
</ResourceDictionary>