IEditableCollectionViewAddNewItem インターフェイス
定義
重要
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特定の型の項目を追加できることを示すために CollectionView で実装するメソッドとプロパティを定義します。
public interface class IEditableCollectionViewAddNewItem : System::ComponentModel::IEditableCollectionViewpublic interface IEditableCollectionViewAddNewItem : System.ComponentModel.IEditableCollectionViewtype IEditableCollectionViewAddNewItem = interface
interface IEditableCollectionViewPublic Interface IEditableCollectionViewAddNewItem
Implements IEditableCollectionView- 派生
- 実装
例
次の例では、ユーザーがコレクションにさまざまな種類の項目を追加できます。 ユーザーは、新しいアイテムを入力してエントリを送信するか、トランザクションを取り消すことができます。 この例では、 の ListBox プロパティから をIEditableCollectionViewAddNewItemItems取得し、その型がユーザーによって決定される オブジェクトを作成します。 次に、 メソッドを AddNewItem 呼び出して、 オブジェクトをコレクションに追加します。
using System;
using System.ComponentModel;
using System.Windows;
namespace IEditableCollectionViewAddItemExample
{
public partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
}
private void Button_Click(object sender, RoutedEventArgs e)
{
IEditableCollectionViewAddNewItem viewToAddDisparateItems =
catalogList.Items as IEditableCollectionViewAddNewItem;
if (!viewToAddDisparateItems.CanAddNewItem)
{
MessageBox.Show("You cannot add items to the list.");
return;
}
// Create a window that prompts the user to enter a new
// item to sell.
AddItemWindow win = new AddItemWindow();
// Create an item, depending on which RadioButton is selected.
// Radio buttons correspond to book, cd, dvd, or other.
LibraryItem newItem;
if ((bool)book.IsChecked)
{
newItem = new Book("Enter the book title", "Enter an Author", "Enter a Genre",
"Enter a call number", DateTime.Now + new TimeSpan(21, 0, 0, 0));
}
else if ((bool)cd.IsChecked)
{
newItem = new MusicCD("Enter the Album", "Enter the artist", 0, "CD.******",
DateTime.Now + new TimeSpan(14, 0, 0, 0));
}
else if ((bool)dvd.IsChecked)
{
newItem = new MovieDVD("Enter the movie title", "Enter the director",
"Enter the genre", new TimeSpan(), "DVD.******",
DateTime.Now + new TimeSpan(7, 0, 0, 0));
}
else
{
newItem = new LibraryItem("Enter the title", "Enter the call number",
DateTime.Now + new TimeSpan(14, 0, 0, 0));
}
// Add the new item to the collection by calling
// IEditableCollectionViewAddNewItem.AddNewItem.
// Set the DataContext of the AddItemWindow to the
// returned item.
win.DataContext = viewToAddDisparateItems.AddNewItem(newItem);
// If the user submits the new item, commit the new
// object to the collection. If the user cancels
// adding the new item, discard the new item.
if ((bool)win.ShowDialog())
{
viewToAddDisparateItems.CommitNew();
}
else
{
viewToAddDisparateItems.CancelNew();
}
}
}
}
Imports System.ComponentModel
Imports System.Windows
Partial Class Window1
Public Sub New()
InitializeComponent()
End Sub
Private Sub Button_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
Dim viewToAddDisparateItems As IEditableCollectionViewAddNewItem =
TryCast(catalogList.Items, IEditableCollectionViewAddNewItem)
If Not viewToAddDisparateItems.CanAddNewItem Then
MessageBox.Show("You cannot add items to the list.")
Exit Sub
End If
' Create a window that prompts the user to enter a new
' item to sell.
Dim win As New AddItemWindow()
' Create an item, depending on which RadioButton is selected.
' Radio buttons correspond to book, cd, dvd, or other.
Dim newItem As LibraryItem
If CBool(Book.IsChecked) Then
newItem = New Book("Enter the book title", "Enter an Author",
"Enter a Genre", "Enter a call number",
DateTime.Now + New TimeSpan(21, 0, 0, 0))
ElseIf CBool(cd.IsChecked) Then
newItem = New MusicCD("Enter the Album", "Enter the artist",
0, "CD.******", DateTime.Now + New TimeSpan(14, 0, 0, 0))
ElseIf CBool(dvd.IsChecked) Then
newItem = New MovieDVD("Enter the movie title",
"Enter the director", "Enter the genre", New TimeSpan(),
"DVD.******", DateTime.Now + New TimeSpan(7, 0, 0, 0))
Else
newItem = New LibraryItem("Enter the title",
"Enter the call number",
DateTime.Now + New TimeSpan(14, 0, 0, 0))
End If
' Add the new item to the collection by calling
' IEditableCollectionViewAddNewItem.AddNewItem.
' Set the DataContext of the AddItemWindow to the
' returned item.
win.DataContext = viewToAddDisparateItems.AddNewItem(newItem)
' If the user submits the new item, commit the new
' object to the collection. If the user cancels
' adding the new item, discard the new item.
If CBool(win.ShowDialog()) Then
viewToAddDisparateItems.CommitNew()
Else
viewToAddDisparateItems.CancelNew()
End If
End Sub
End Class
次の例では、前の例のユーザー インターフェイスを作成します。
<StackPanel xmlns:src="clr-namespace:IEditableCollectionViewAddItemExample">
<StackPanel.Resources>
<src:LibraryCatalog x:Key="catalog"/>
<!--Use AlternationConverter to create alternating background brushes
to better distinguish each item. See AlternationConverter
for more information.-->
<AlternationConverter x:Key="BackgroundConverter">
<SolidColorBrush>LightBlue</SolidColorBrush>
<SolidColorBrush>LightGray</SolidColorBrush>
</AlternationConverter>
<!--The DataTemplate for LibraryItem, which is the base class
of the other data types.-->
<DataTemplate DataType="{x:Type src:LibraryItem}">
<StackPanel>
<TextBlock FontWeight="Bold">Item:</TextBlock>
<TextBlock Text="{Binding Title, StringFormat={}Title: {0}}"/>
<TextBlock>
<TextBlock.Text>
<MultiBinding StringFormat="{}Due Date: {0:d} Call Number: {1}">
<Binding Path="DueDate"/>
<Binding Path="CallNumber"/>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
</StackPanel>
</DataTemplate>
<!--The DataTemplate for Book.-->
<DataTemplate DataType="{x:Type src:Book}">
<StackPanel>
<TextBlock FontWeight="Bold">Book:</TextBlock>
<TextBlock Text="{Binding Title, StringFormat={}Title: {0}}"/>
<TextBlock>
<TextBlock.Text>
<MultiBinding StringFormat="{}Author: {0} Genre: {1}">
<Binding Path="Author"/>
<Binding Path="Genre"/>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
<TextBlock>
<TextBlock.Text>
<MultiBinding StringFormat="{}Due Date: {0:d} Call Number: {1}">
<Binding Path="DueDate"/>
<Binding Path="CallNumber"/>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
</StackPanel>
</DataTemplate>
<!--The DataTemplate for MusicCD.-->
<DataTemplate DataType="{x:Type src:MusicCD}">
<StackPanel>
<TextBlock FontWeight="Bold">Music CD:</TextBlock>
<TextBlock Text="{Binding Title, StringFormat={}Title: {0}}"/>
<TextBlock>
<TextBlock.Text>
<MultiBinding StringFormat="{}Artist: {0} Tracks: {1}">
<Binding Path="Artist"/>
<Binding Path="NumberOfTracks"/>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
<TextBlock>
<TextBlock.Text>
<MultiBinding StringFormat="{}Due Date: {0:d} Call Number: {1}">
<Binding Path="DueDate"/>
<Binding Path="CallNumber"/>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
</StackPanel>
</DataTemplate>
<!--The DataTemplate for MovieDVD-->
<DataTemplate DataType="{x:Type src:MovieDVD}">
<StackPanel>
<TextBlock FontWeight="Bold">Movie DVD:</TextBlock>
<TextBlock Text="{Binding Title, StringFormat={}Title: {0}}"/>
<TextBlock>
<TextBlock.Text>
<MultiBinding StringFormat="{}Director: {0} Genre: {1} Length: {2}">
<Binding Path="Director"/>
<Binding Path="Genre"/>
<Binding Path="Length"/>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
<TextBlock>
<TextBlock.Text>
<MultiBinding StringFormat="{}Due Date: {0:d} Call Number: {1}">
<Binding Path="DueDate"/>
<Binding Path="CallNumber"/>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
</StackPanel>
</DataTemplate>
</StackPanel.Resources>
<!--Bind a ListBox to a collection of LibraryItem objects. The collection
can hold objects any type that inherits from LibraryItem.-->
<ListBox Name="catalogList" Height="350" AlternationCount="2"
ItemsSource="{StaticResource catalog}">
<!--Use alternating background styles to better distinguish each item.
See ItemsControl.AlternationIndex for more information.-->
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Setter Property="Background"
Value="{Binding RelativeSource={RelativeSource Self},
Path=(ItemsControl.AlternationIndex),
Converter={StaticResource BackgroundConverter}}"/>
<Setter Property="Margin" Value="3"/>
</Style>
</ListBox.ItemContainerStyle>
</ListBox>
<!--Enable the user to choose a type of item to add to the collection.-->
<TextBlock>Select an item to add:</TextBlock>
<RadioButton Name="book" >Book</RadioButton>
<RadioButton Name="cd">Music CD</RadioButton>
<RadioButton Name="dvd">DVD</RadioButton>
<RadioButton>Other</RadioButton>
<Button Margin="0,3,0,0" Click="Button_Click">Add Item</Button>
</StackPanel>
次の例では、 AddItemWindow ユーザーが新しい項目のデータを追加する を作成します。
<StackPanel Margin="10" Width="250">
<StackPanel.Resources>
<!--Add an event handler to select all text when
a TextBox gets focus.-->
<Style TargetType="TextBox">
<EventSetter Event="GotFocus" Handler="TextBoxFocus"/>
</Style>
<!--Create a Template for HeaderedContentControl so the header is
to the left of the content.-->
<Style TargetType="HeaderedContentControl">
<Setter Property="Margin" Value="2"/>
<Setter Property="Focusable" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="HeaderedContentControl">
<DockPanel LastChildFill="False">
<ContentPresenter ContentSource="Header" DockPanel.Dock="Left"
Focusable="False" VerticalAlignment="Center"/>
<ContentPresenter ContentSource="Content" Margin="5,0,0,0"
DockPanel.Dock="Right" VerticalAlignment="Center"/>
</DockPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style TargetType="Button">
<Setter Property="Width" Value="100"/>
<Setter Property="Margin" Value="10,15,15,15"/>
</Style>
<!--The DataTemplate that is used when the user
enters a new LibraryItem.-->
<DataTemplate DataType="{x:Type src:LibraryItem}">
<StackPanel>
<HeaderedContentControl Header="Title">
<TextBox Width="150" Text="{Binding Path=Title, Mode=TwoWay}"/>
</HeaderedContentControl>
<HeaderedContentControl Header="Due Date">
<TextBox Width="150" Text="{Binding Path=DueDate, StringFormat=d, Mode=TwoWay}">
</TextBox>
</HeaderedContentControl>
<HeaderedContentControl Header="Call Number">
<TextBox Width="150" Text="{Binding Path=CallNumber, Mode=TwoWay}"/>
</HeaderedContentControl>
</StackPanel>
</DataTemplate>
<!--The DataTemplate that is used when the user
enters a new Book.-->
<DataTemplate DataType="{x:Type src:Book}">
<StackPanel>
<HeaderedContentControl Header="Title">
<TextBox Width="150" Text="{Binding Path=Title, Mode=TwoWay}"/>
</HeaderedContentControl>
<HeaderedContentControl Header="Author">
<TextBox Width="150" Text="{Binding Path=Author, Mode=TwoWay}"/>
</HeaderedContentControl>
<HeaderedContentControl Header="Genre">
<TextBox Width="150" Text="{Binding Path=Genre, Mode=TwoWay}"/>
</HeaderedContentControl>
<HeaderedContentControl Header="Due Date">
<TextBox Width="150" Text="{Binding Path=DueDate, StringFormat=d, Mode=TwoWay}"/>
</HeaderedContentControl>
<HeaderedContentControl Header="Call Number">
<TextBox Width="150" Text="{Binding Path=CallNumber, Mode=TwoWay}"/>
</HeaderedContentControl>
</StackPanel>
</DataTemplate>
<!--The DataTemplate that is used when the user
enters a new MusicCD.-->
<DataTemplate DataType="{x:Type src:MusicCD}">
<StackPanel>
<HeaderedContentControl Header="Title">
<TextBox Width="150" Text="{Binding Path=Title, Mode=TwoWay}"/>
</HeaderedContentControl>
<HeaderedContentControl Header="Artist">
<TextBox Width="150" Text="{Binding Path=Artist, Mode=TwoWay}"/>
</HeaderedContentControl>
<HeaderedContentControl Header="Tracks">
<TextBox Width="150" Text="{Binding Path=NumberOfTracks, Mode=TwoWay}"/>
</HeaderedContentControl>
<HeaderedContentControl Header="Due Date">
<TextBox Width="150" Text="{Binding Path=DueDate, StringFormat=d, Mode=TwoWay}"/>
</HeaderedContentControl>
<HeaderedContentControl Header="Call Number">
<TextBox Width="150" Text="{Binding Path=CallNumber, Mode=TwoWay}"/>
</HeaderedContentControl>
</StackPanel>
</DataTemplate>
<!--The DataTemplate that is used when the user
enters a new MovieDVD.-->
<DataTemplate DataType="{x:Type src:MovieDVD}">
<StackPanel>
<HeaderedContentControl Header="Title">
<TextBox Width="150" Text="{Binding Path=Title, Mode=TwoWay}"/>
</HeaderedContentControl>
<HeaderedContentControl Header="Director">
<TextBox Width="150" Text="{Binding Path=Director, Mode=TwoWay}"/>
</HeaderedContentControl>
<HeaderedContentControl Header="Length">
<TextBox Width="150" Text="{Binding Path=Length, Mode=TwoWay}"/>
</HeaderedContentControl>
<HeaderedContentControl Header="Genre">
<TextBox Width="150" Text="{Binding Path=Genre, Mode=TwoWay}"/>
</HeaderedContentControl>
<HeaderedContentControl Header="Due Date">
<TextBox Width="150" Text="{Binding Path=DueDate, StringFormat=d, Mode=TwoWay}"/>
</HeaderedContentControl>
<HeaderedContentControl Header="Call Number">
<TextBox Width="150" Text="{Binding Path=CallNumber, Mode=TwoWay}"/>
</HeaderedContentControl>
</StackPanel>
</DataTemplate>
</StackPanel.Resources>
<!--One of the DataTemplates that defined above
is used by this ContentControl when the window is created.-->
<ContentControl Content="{Binding}" />
<StackPanel Orientation="Horizontal">
<Button IsDefault="True" Click="Submit_Click">_Submit</Button>
<Button IsCancel="True">_Cancel</Button>
</StackPanel>
</StackPanel>
次の例では、AddItemWindow のロジックを示します。
using System.Windows;
using System.Windows.Controls;
namespace IEditableCollectionViewAddItemExample
{
public partial class AddItemWindow : Window
{
public AddItemWindow()
{
InitializeComponent();
}
private void Submit_Click(object sender, RoutedEventArgs e)
{
DialogResult = true;
Close();
}
// Select all text when the TextBox gets focus.
private void TextBoxFocus(object sender, RoutedEventArgs e)
{
TextBox tbx = sender as TextBox;
tbx.SelectAll();
}
}
}
Imports System.Windows
Imports System.Windows.Controls
Partial Public Class AddItemWindow
Inherits Window
Public Sub New()
InitializeComponent()
End Sub
Private Sub Submit_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
DialogResult = True
Close()
End Sub
' Select all text when the TextBox gets focus.
Private Sub TextBoxFocus(ByVal sender As Object, ByVal e As RoutedEventArgs)
Dim tbx As TextBox = TryCast(sender, TextBox)
tbx.SelectAll()
End Sub
End Class
次の例は、前の例で使用したデータ型とコレクションを示しています。
using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
namespace IEditableCollectionViewAddItemExample
{
// LibraryItem implements INotifyPropertyChanged so that the
// application is notified when a property changes. It
// implements IEditableObject so that pending changes can be discarded.
public class LibraryItem : INotifyPropertyChanged, IEditableObject
{
struct ItemData
{
internal string Title;
internal string CallNumber;
internal DateTime DueDate;
}
ItemData copyData;
ItemData currentData;
public LibraryItem(string title, string callNum, DateTime dueDate)
{
Title = title;
CallNumber = callNum;
DueDate = dueDate;
}
public override string ToString()
{
return String.Format("{0}, {1:c}, {2:D}", Title, CallNumber, DueDate);
}
public string Title
{
get { return currentData.Title; }
set
{
if (currentData.Title != value)
{
currentData.Title = value;
NotifyPropertyChanged("Title");
}
}
}
public string CallNumber
{
get { return currentData.CallNumber; }
set
{
if (currentData.CallNumber != value)
{
currentData.CallNumber = value;
NotifyPropertyChanged("CallNumber");
}
}
}
public DateTime DueDate
{
get { return currentData.DueDate; }
set
{
if (value != currentData.DueDate)
{
currentData.DueDate = value;
NotifyPropertyChanged("DueDate");
}
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
protected void NotifyPropertyChanged(String info)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(info));
}
}
#endregion
#region IEditableObject Members
public virtual void BeginEdit()
{
copyData = currentData;
}
public virtual void CancelEdit()
{
currentData = copyData;
NotifyPropertyChanged("");
}
public virtual void EndEdit()
{
copyData = new ItemData();
}
#endregion
}
public class MusicCD : LibraryItem
{
private struct MusicData
{
internal int SongNumber;
internal string Artist;
}
MusicData copyData;
MusicData currentData;
public MusicCD(string title, string artist, int songNum, string callNum, DateTime dueDate)
: base(title, callNum, dueDate)
{
currentData.SongNumber = songNum;
currentData.Artist = artist;
}
public string Artist
{
get { return currentData.Artist; }
set
{
if (value != currentData.Artist)
{
currentData.Artist = value;
NotifyPropertyChanged("Artist");
}
}
}
public int NumberOfTracks
{
get { return currentData.SongNumber; }
set
{
if (value != currentData.SongNumber)
{
currentData.SongNumber = value;
NotifyPropertyChanged("NumberOfTracks");
}
}
}
public override void BeginEdit()
{
base.BeginEdit();
copyData = currentData;
}
public override void CancelEdit()
{
base.CancelEdit();
currentData = copyData;
}
public override void EndEdit()
{
base.EndEdit();
copyData = new MusicData();
}
public override string ToString()
{
return string.Format(
"Album: {0}\nArtist: {1}\nTracks: {2}\nDue Date: {3:d}\nCall Number: {4}",
this.Title, this.Artist, this.NumberOfTracks, this.DueDate, this.CallNumber);
}
}
public class Book : LibraryItem
{
private struct BookData
{
internal string Author;
internal string Genre;
}
BookData currentData;
BookData copyData;
public Book(string title, string author, string genre, string callnum, DateTime dueDate)
: base (title, callnum, dueDate)
{
this.Author = author;
this.Genre = genre;
}
public string Author
{
get { return currentData.Author; }
set
{
if (value != currentData.Author)
{
currentData.Author = value;
NotifyPropertyChanged("Author");
}
}
}
public string Genre
{
get { return currentData.Genre; }
set
{
if (value != currentData.Genre)
{
currentData.Genre = value;
NotifyPropertyChanged("Genre");
}
}
}
public override void BeginEdit()
{
base.BeginEdit();
copyData = currentData;
}
public override void CancelEdit()
{
base.CancelEdit();
currentData = copyData;
}
public override void EndEdit()
{
base.EndEdit();
copyData = new BookData();
}
public override string ToString()
{
return String.Format(
"Title: {0}\nAuthor: {1}\nGenre: {2}\nDue Date: {3:d}\nCall Number: {4}",
this.Title, this.Author, this.Genre, this.DueDate, this.CallNumber);
}
}
public class MovieDVD : LibraryItem
{
private struct MovieData
{
internal TimeSpan Length;
internal string Director;
internal string Genre;
}
private MovieData currentData;
private MovieData copyData;
public MovieDVD(string title, string director, string genre, TimeSpan length, string callnum, DateTime dueDate)
: base(title, callnum, dueDate)
{
this.Director = director;
this.Length = length;
this.Genre = genre;
}
public TimeSpan Length
{
get { return currentData.Length; }
set
{
if (value != currentData.Length)
{
currentData.Length = value;
NotifyPropertyChanged("Length");
}
}
}
public string Director
{
get { return currentData.Director; }
set
{
if (value != currentData.Director)
{
currentData.Director = value;
NotifyPropertyChanged("Director");
}
}
}
public string Genre
{
get { return currentData.Genre; }
set
{
if (value != currentData.Genre)
{
currentData.Genre = value;
NotifyPropertyChanged("Genre");
}
}
}
public override void BeginEdit()
{
base.BeginEdit();
copyData = currentData;
}
public override void CancelEdit()
{
base.CancelEdit();
currentData = copyData;
}
public override void EndEdit()
{
base.EndEdit();
copyData = new MovieData();
}
public override string ToString()
{
return String.Format("Title: {0}\nDirector: {1}\nGenre: {2}\nLength: {3}\nDue Date: {4:d}\nCall Number: {5}",
this.Title, this.Director, this.Genre, this.Length, this.DueDate, this.CallNumber);
}
}
public class LibraryCatalog : ObservableCollection<LibraryItem>
{
public LibraryCatalog()
{
Add(new MusicCD("A Programmers Plight", "Jon Orton",
12, "CD.OrtPro", new DateTime(2010, 3, 24)));
Add(new Book("Cooking with Thyme", "Eliot J. Graff",
"Home Economics", "HE.GraThy", new DateTime(2010, 2, 26)));
Add(new MovieDVD("Terror of the Testers", "Molly Dempsey",
"Horror", new TimeSpan(1, 27, 19), "DVD.DemTer",
new DateTime(2010, 2, 1)));
Add(new MusicCD("The Best of Jim Hance", "Jim Hance",
15, "CD.HanBes", new DateTime(2010, 1, 31)));
Add(new Book("Victor and the VB Vehicle", "Tommy Hortono",
"YA Fiction", "YA.HorVic", new DateTime(2010, 3, 1)));
}
}
}
Imports System.Collections.ObjectModel
Imports System.ComponentModel
' LibraryItem implements INotifyPropertyChanged so that the
' application is notified when a property changes. It
' implements IEditableObject so that pending changes can be discarded.
Public Class LibraryItem
Implements INotifyPropertyChanged
Implements IEditableObject
Private Structure ItemData
Friend Title As String
Friend CallNumber As String
Friend DueDate As DateTime
End Structure
Private copyData As ItemData
Private currentData As ItemData
Public Sub New(ByVal title As String, ByVal callNum As String, ByVal dueDate As DateTime)
Me.Title = title
Me.CallNumber = callNum
Me.DueDate = dueDate
End Sub
Public Property Title() As String
Get
Return currentData.Title
End Get
Set(ByVal value As String)
If currentData.Title <> value Then
currentData.Title = value
NotifyPropertyChanged("Title")
End If
End Set
End Property
Public Property CallNumber() As String
Get
Return currentData.CallNumber
End Get
Set(ByVal value As String)
If currentData.CallNumber <> value Then
currentData.CallNumber = value
NotifyPropertyChanged("CallNumber")
End If
End Set
End Property
Public Property DueDate() As DateTime
Get
Return currentData.DueDate
End Get
Set(ByVal value As DateTime)
If value <> currentData.DueDate Then
currentData.DueDate = value
NotifyPropertyChanged("DueDate")
End If
End Set
End Property
#Region "INotifyPropertyChanged Members"
Public Event PropertyChanged As PropertyChangedEventHandler _
Implements INotifyPropertyChanged.PropertyChanged
Protected Sub NotifyPropertyChanged(ByVal info As String)
RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(info))
End Sub
#End Region
#Region "IEditableObject Members"
Public Overridable Sub BeginEdit() Implements IEditableObject.BeginEdit
copyData = currentData
End Sub
Public Overridable Sub CancelEdit() Implements IEditableObject.CancelEdit
currentData = copyData
NotifyPropertyChanged("")
End Sub
Public Overridable Sub EndEdit() Implements IEditableObject.EndEdit
copyData = New ItemData()
End Sub
#End Region
End Class
Public Class MusicCD
Inherits LibraryItem
Private Structure MusicData
Friend SongNumber As Integer
Friend Artist As String
End Structure
Private copyData As MusicData
Private currentData As MusicData
Public Sub New(ByVal title As String, ByVal artist As String,
ByVal songNum As Integer, ByVal callNum As String,
ByVal dueDate As DateTime)
MyBase.New(title, callNum, dueDate)
currentData.SongNumber = songNum
currentData.Artist = artist
End Sub
Public Property Artist() As String
Get
Return currentData.Artist
End Get
Set(ByVal value As String)
If value <> currentData.Artist Then
currentData.Artist = value
NotifyPropertyChanged("Artist")
End If
End Set
End Property
Public Property NumberOfTracks() As Integer
Get
Return currentData.SongNumber
End Get
Set(ByVal value As Integer)
If value <> currentData.SongNumber Then
currentData.SongNumber = value
NotifyPropertyChanged("NumberOfTracks")
End If
End Set
End Property
Public Overloads Overrides Sub BeginEdit()
MyBase.BeginEdit()
copyData = currentData
End Sub
Public Overloads Overrides Sub CancelEdit()
MyBase.CancelEdit()
currentData = copyData
End Sub
Public Overloads Overrides Sub EndEdit()
MyBase.EndEdit()
copyData = New MusicData()
End Sub
End Class
Public Class Book
Inherits LibraryItem
Private Structure BookData
Friend Author As String
Friend Genre As String
End Structure
Private currentData As BookData
Private copyData As BookData
Public Sub New(ByVal title As String, ByVal author As String,
ByVal genre As String, ByVal callnum As String,
ByVal dueDate As DateTime)
MyBase.New(title, callnum, dueDate)
Me.Author = author
Me.Genre = genre
End Sub
Public Property Author() As String
Get
Return currentData.Author
End Get
Set(ByVal value As String)
If value <> currentData.Author Then
currentData.Author = value
NotifyPropertyChanged("Author")
End If
End Set
End Property
Public Property Genre() As String
Get
Return currentData.Genre
End Get
Set(ByVal value As String)
If value <> currentData.Genre Then
currentData.Genre = value
NotifyPropertyChanged("Genre")
End If
End Set
End Property
Public Overloads Overrides Sub BeginEdit()
MyBase.BeginEdit()
copyData = currentData
End Sub
Public Overloads Overrides Sub CancelEdit()
MyBase.CancelEdit()
currentData = copyData
End Sub
Public Overloads Overrides Sub EndEdit()
MyBase.EndEdit()
copyData = New BookData()
End Sub
End Class
Public Class MovieDVD
Inherits LibraryItem
Private Structure MovieData
Friend Length As TimeSpan
Friend Director As String
Friend Genre As String
End Structure
Private currentData As MovieData
Private copyData As MovieData
Public Sub New(ByVal title As String, ByVal director As String,
ByVal genre As String, ByVal length As TimeSpan,
ByVal callnum As String, ByVal dueDate As DateTime)
MyBase.New(title, callnum, dueDate)
Me.Director = director
Me.Length = length
Me.Genre = genre
End Sub
Public Property Length() As TimeSpan
Get
Return currentData.Length
End Get
Set(ByVal value As TimeSpan)
If value <> currentData.Length Then
currentData.Length = value
NotifyPropertyChanged("Length")
End If
End Set
End Property
Public Property Director() As String
Get
Return currentData.Director
End Get
Set(ByVal value As String)
If value <> currentData.Director Then
currentData.Director = value
NotifyPropertyChanged("Director")
End If
End Set
End Property
Public Property Genre() As String
Get
Return currentData.Genre
End Get
Set(ByVal value As String)
If value <> currentData.Genre Then
currentData.Genre = value
NotifyPropertyChanged("Genre")
End If
End Set
End Property
Public Overloads Overrides Sub BeginEdit()
MyBase.BeginEdit()
copyData = currentData
End Sub
Public Overloads Overrides Sub CancelEdit()
MyBase.CancelEdit()
currentData = copyData
End Sub
Public Overloads Overrides Sub EndEdit()
MyBase.EndEdit()
copyData = New MovieData()
End Sub
End Class
Public Class LibraryCatalog
Inherits ObservableCollection(Of LibraryItem)
Public Sub New()
Add(New MusicCD("A Programmers Plight", "Jon Orton", 12,
"CD.OrtPro", New DateTime(2010, 3, 24)))
Add(New Book("Cooking with Thyme", "Eliot J. Graff",
"Home Economics", "HE.GraThy", New DateTime(2010, 2, 26)))
Add(New MovieDVD("Terror of the Testers", "Molly Dempsey", "Horror",
New TimeSpan(1, 27, 19), "DVD.DemTer", New DateTime(2010, 2, 1)))
Add(New MusicCD("The Best of Jim Hance", "Jim Hance", 15,
"CD.HanBes", New DateTime(2010, 1, 31)))
Add(New Book("Victor and the VB Vehicle", "Tommy Hortono",
"YA Fiction", "YA.HorVic", New DateTime(2010, 3, 1)))
End Sub
End Class
注釈
インターフェイスを使用すると、アプリケーション開発者は IEditableCollectionViewAddNewItem 、コレクションに追加するオブジェクトの種類を指定できます。 このインターフェイスは を拡張 IEditableCollectionViewするため、コレクション内の項目を追加、編集、および削除できます。 IEditableCollectionViewAddNewItem は、 メソッドを AddNewItem 追加します。これは、コレクションに追加されるオブジェクトを受け取ります。 このメソッドは、追加するコレクションとオブジェクトに次の特性が 1 つ以上ある場合に便利です。
内の CollectionView オブジェクトは異なる型です。
オブジェクトにはパラメーターなしのコンストラクターがありません。
オブジェクトが既に存在します。
オブジェクトをコレクションに追加
nullする場合。
プロパティ
| CanAddNew |
新しい項目をコレクションに追加できるかどうかを示す値を取得します。 (継承元 IEditableCollectionView) |
| CanAddNewItem |
指定したオブジェクトをコレクションに追加できるかどうかを示す値を取得します。 |
| CanCancelEdit |
コレクション ビューが保留中の変更を破棄して、編集されたオブジェクトの元の値を復元できるかどうかを示す値を取得します。 (継承元 IEditableCollectionView) |
| CanRemove |
コレクションから項目を削除できるかどうかを示す値を取得します。 (継承元 IEditableCollectionView) |
| CurrentAddItem |
現在の追加トランザクション処理中に追加される項目を取得します。 (継承元 IEditableCollectionView) |
| CurrentEditItem |
編集されているコレクション内の項目を取得します。 (継承元 IEditableCollectionView) |
| IsAddingNew |
追加トランザクションが実行中かどうかを示す値を取得します。 (継承元 IEditableCollectionView) |
| IsEditingItem |
編集トランザクションが実行中かどうかを示す値を取得します。 (継承元 IEditableCollectionView) |
| NewItemPlaceholderPosition |
コレクション ビューにある新しい項目のプレースホルダーの位置を取得または設定します。 (継承元 IEditableCollectionView) |
メソッド
| AddNew() |
新しい項目をコレクションに追加します。 (継承元 IEditableCollectionView) |
| AddNewItem(Object) |
指定したオブジェクトをコレクションに追加します。 |
| CancelEdit() |
編集トランザクションを終了し、可能な場合は、項目の元の値を復元します。 (継承元 IEditableCollectionView) |
| CancelNew() |
追加トランザクションを終了し、保留中の新しい項目を破棄します。 (継承元 IEditableCollectionView) |
| CommitEdit() |
編集トランザクションを終了し、保留中の変更を保存します。 (継承元 IEditableCollectionView) |
| CommitNew() |
追加トランザクションを終了し、保留中の新しい項目を保存します。 (継承元 IEditableCollectionView) |
| EditItem(Object) |
指定した項目の編集トランザクションを開始します。 (継承元 IEditableCollectionView) |
| Remove(Object) |
指定した項目をコレクションから削除します。 (継承元 IEditableCollectionView) |
| RemoveAt(Int32) |
コレクション内の指定した位置にある項目を削除します。 (継承元 IEditableCollectionView) |
適用対象
GitHub で Microsoft と共同作業する
このコンテンツのソースは GitHub にあります。そこで、issue や pull request を作成および確認することもできます。 詳細については、共同作成者ガイドを参照してください。
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