WPF'yi küçük bir editör projesiyle öğrenmek ve MVVM ile tasarlayarak.WPF Bağlama Uygulama Komutları ViewModel ICommand
Aşağıdaki kod, "System.Windows.Data.Binding öğesinde değer sağla" özel bir durum oluşturmuştur. XAML ilk ayrıştırıldığında çalışma zamanında. Yapı hatası yok.
nasıl iyi Uygulama Komutları Close, Kaydet, Farklı Kaydet, Aç, Yeni benim ICommands bağlamak vbŞu anda sadece yakın ve Yeni kurulum var.
XAML Kod:
<Window x:Class="Editor.Views.EditorView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:Editor.Views"
xmlns:vm="clr-namespace:Editor.ViewModels"
xmlns:userControls="clr-namespace:Editor.UserControls"
mc:Ignorable="d"
Title="EditorView" Height="600" Width="800" WindowStartupLocation="CenterScreen">
<Window.Resources>
<DataTemplate DataType="{x:Type vm:DocumentViewModel}">
<ContentControl Content="{Binding DocTextBox}" />
</DataTemplate>
</Window.Resources>
<Window.CommandBindings>
<CommandBinding Command="ApplicationCommands.Close"
Executed="{Binding ExitCommand}" />
<CommandBinding Command="ApplicationCommands.New"
Executed="{Binding NewDocumentCommand}" />
<!--<CommandBinding Command="ApplicationCommands.Open"
Executed="OpenDocument" />
<CommandBinding Command="ApplicationCommands.Save"
CanExecute="SaveDocument_CanExecute"
Executed="SaveDocument" />
<CommandBinding Command="ApplicationCommands.SaveAs"
Executed="SaveDocumentAs" />-->
</Window.CommandBindings>
<Window.InputBindings>
<KeyBinding Key="N" Modifiers="Control" Command="{Binding NewDocumentCommand}" />
<KeyBinding Key="F4" Modifiers="Control" Command="{Binding CloseDocumentCommand}" />
</Window.InputBindings>
<DockPanel>
<userControls:Menu x:Name="menu"
DockPanel.Dock="Top" />
<TabControl ItemsSource="{Binding Documents}" SelectedIndex="{Binding SelectedIndex}">
<TabControl.ItemTemplate>
<DataTemplate>
<WrapPanel>
<TextBlock Text="{Binding FileName}" />
<Button Command="{Binding CloseCommand}" Content="X" Margin="4,0,0,0" FontFamily="Courier New" Width="17" Height="17" VerticalContentAlignment="Center" />
</WrapPanel>
</DataTemplate>
</TabControl.ItemTemplate>
</TabControl>
</DockPanel>
</Window>
ViewModel Kodu:
public class EditorViewModel : ViewModelBase
{
private static int _count = 0;
public EditorViewModel()
{
Documents = new ObservableCollection<DocumentViewModel>();
Documents.CollectionChanged += Documents_CollectionChanged;
}
#region Event Handlers
void Documents_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.NewItems != null && e.NewItems.Count != 0)
foreach (DocumentViewModel document in e.NewItems)
document.RequestClose += this.OnDocumentRequestClose;
if (e.OldItems != null && e.OldItems.Count != 0)
foreach (DocumentViewModel document in e.OldItems)
document.RequestClose -= this.OnDocumentRequestClose;
}
private void OnDocumentRequestClose(object sender, EventArgs e)
{
CloseDocument();
}
#endregion
#region Commands
private RelayCommand _exitCommand;
public ICommand ExitCommand
{
get { return _exitCommand ?? (_exitCommand = new RelayCommand(() => Application.Current.Shutdown())); }
}
private RelayCommand _newDocumentCommand;
public ICommand NewDocumentCommand
{
get { return _newDocumentCommand ?? (_newDocumentCommand = new RelayCommand(NewDocument)); }
}
private void NewDocument()
{
_count++;
var document = new DocumentViewModel { FileName = "New " + _count, DocTextBox = new RichTextBox() };
Documents.Add(document);
SelectedIndex = Documents.IndexOf(document);
}
private RelayCommand _closeDocumentCommand;
public ICommand CloseDocumentCommand
{
get { return _closeDocumentCommand ?? (_closeDocumentCommand = new RelayCommand(CloseDocument, param => Documents.Count > 0)); }
}
private void CloseDocument()
{
Documents.RemoveAt(SelectedIndex);
SelectedIndex = 0;
}
#endregion
#region Public Members
public ObservableCollection<DocumentViewModel> Documents { get; set; }
private int _selectedIndex = 0;
public int SelectedIndex
{
get { return _selectedIndex; }
set
{
_selectedIndex = value;
OnPropertyChanged();
}
}
#endregion
}
Sen anlamsızdır başka Komutanlığı'na Gerçekleştirilen bağlayıcıdır. Yürütülen öznitelik için bir yöntem adı sağlayın. – AnjumSKhan