private void ItemsSource_PropertyChanged(DependencyObject sender, DependencyProperty dp)
{
// If we're given a different ItemsSource, we need to wrap that collection in our helper class.
if (ItemsSource != null && ItemsSource.GetType() != typeof(InterspersedObservableCollection))
{
_innerItemsSource = new InterspersedObservableCollection(ItemsSource);
_currentTextEdit = _lastTextEdit = new PretokenStringContainer(true);
_innerItemsSource.Insert(_innerItemsSource.Count, _currentTextEdit);
ItemsSource = _innerItemsSource;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="TokenizingTextBox"/> class.
/// </summary>
public TokenizingTextBox()
{
// Setup our base state of our collection
_innerItemsSource = new InterspersedObservableCollection(new ObservableCollection <object>()); // TODO: Test this still will let us bind to ItemsSource in XAML?
_currentTextEdit = _lastTextEdit = new PretokenStringContainer(true);
_innerItemsSource.Insert(_innerItemsSource.Count, _currentTextEdit);
ItemsSource = _innerItemsSource;
//// TODO: Consolidate with callback below for ItemsSourceProperty changed?
DefaultStyleKey = typeof(TokenizingTextBox);
// TODO: Do we want to support ItemsSource better? Need to investigate how that works with adding...
RegisterPropertyChangedCallback(ItemsSourceProperty, ItemsSource_PropertyChanged);
PreviewKeyDown += TokenizingTextBox_PreviewKeyDown;
PreviewKeyUp += TokenizingTextBox_PreviewKeyUp;
CharacterReceived += TokenizingTextBox_CharacterReceived;
ItemClick += TokenizingTextBox_ItemClick;
}
private void ItemsSource_PropertyChanged(DependencyObject sender, DependencyProperty dp)
{
// If we're given a different ItemsSource, we need to wrap that collection in our helper class.
if (ItemsSource != null && ItemsSource.GetType() != typeof(InterspersedObservableCollection))
{
_innerItemsSource = new InterspersedObservableCollection(ItemsSource);
if (ReadLocalValue(MaximumTokensProperty) != DependencyProperty.UnsetValue && _innerItemsSource.ItemsSource.Count >= MaximumTokens)
{
// Reduce down to below the max as necessary.
var endCount = MaximumTokens > 0 ? MaximumTokens : 0;
for (var i = _innerItemsSource.ItemsSource.Count - 1; i >= endCount; --i)
{
_innerItemsSource.Remove(_innerItemsSource[i]);
}
}
_currentTextEdit = _lastTextEdit = new PretokenStringContainer(true);
_innerItemsSource.Insert(_innerItemsSource.Count, _currentTextEdit);
ItemsSource = _innerItemsSource;
}
}
private async void TokenizingTextBox_CharacterReceived(UIElement sender, CharacterReceivedRoutedEventArgs args)
{
var container = ContainerFromItem(_currentTextEdit) as TokenizingTextBoxItem;
if (container != null && !(GetFocusedElement().Equals(container._autoSuggestTextBox) || char.IsControl(args.Character)))
{
if (SelectedItems.Count > 0)
{
var index = _innerItemsSource.IndexOf(SelectedItems.First());
await RemoveAllSelectedTokens();
// Wait for removal of old items
_ = Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
// If we're before the last textbox and it's empty, redirect focus to that one instead
if (index == _innerItemsSource.Count - 1 && string.IsNullOrWhiteSpace(_lastTextEdit.Text))
{
var lastContainer = ContainerFromItem(_lastTextEdit) as TokenizingTextBoxItem;
lastContainer.UseCharacterAsUser = true; // Make sure we trigger a refresh of suggested items.
_lastTextEdit.Text = string.Empty + args.Character;
UpdateCurrentTextEdit(_lastTextEdit);
lastContainer._autoSuggestTextBox.SelectionStart = 1; // Set position to after our new character inserted
lastContainer._autoSuggestTextBox.Focus(FocusState.Keyboard);
}
else
{
//// Otherwise, create a new textbox for this text.
UpdateCurrentTextEdit(new PretokenStringContainer((string.Empty + args.Character).Trim())); // Trim so that 'space' isn't inserted and can be used to insert a new box.
_innerItemsSource.Insert(index, _currentTextEdit);
// Need to wait for containerization
_ = Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
var newContainer = ContainerFromIndex(index) as TokenizingTextBoxItem; // Should be our last text box
newContainer.UseCharacterAsUser = true; // Make sure we trigger a refresh of suggested items.
void WaitForLoad(object s, RoutedEventArgs eargs)
{
if (newContainer._autoSuggestTextBox != null)
{
newContainer._autoSuggestTextBox.SelectionStart = 1; // Set position to after our new character inserted
newContainer._autoSuggestTextBox.Focus(FocusState.Keyboard);
}
newContainer.Loaded -= WaitForLoad;
}
newContainer.AutoSuggestTextBoxLoaded += WaitForLoad;
});
}
});
}
else
{
// TODO: It looks like we're setting selection and focus together on items? Not sure if that's what we want...
// If that's the case, don't think this code will ever be called?
//// TODO: Behavior question: if no items selected (just focus) does it just go to our last active textbox?
//// Community voted that typing in the end box made sense
if (_innerItemsSource[_innerItemsSource.Count - 1] is ITokenStringContainer textToken)
{
var last = ContainerFromIndex(Items.Count - 1) as TokenizingTextBoxItem; // Should be our last text box
var position = last._autoSuggestTextBox.SelectionStart;
textToken.Text = last._autoSuggestTextBox.Text.Substring(0, position) + args.Character +
last._autoSuggestTextBox.Text.Substring(position);
last._autoSuggestTextBox.SelectionStart = position + 1; // Set position to after our new character inserted
last._autoSuggestTextBox.Focus(FocusState.Keyboard);
}
}
}
}
private async void TokenizingTextBox_CharacterReceived(UIElement sender, CharacterReceivedRoutedEventArgs args)
{
var container = ContainerFromItem(_currentTextEdit) as TokenizingTextBoxItem;
if (container != null && !(GetFocusedElement().Equals(container._autoSuggestTextBox) || char.IsControl(args.Character)))
{
if (SelectedItems.Count > 0)
{
var index = _innerItemsSource.IndexOf(SelectedItems.First());
await RemoveAllSelectedTokens();
// Wait for removal of old items
var dispatcherQueue = DispatcherQueue.GetForCurrentThread();
_ = dispatcherQueue.EnqueueAsync(
() =>
{
// If we're before the last textbox and it's empty, redirect focus to that one instead
if (index == _innerItemsSource.Count - 1 && string.IsNullOrWhiteSpace(_lastTextEdit.Text))
{
var lastContainer = ContainerFromItem(_lastTextEdit) as TokenizingTextBoxItem;
lastContainer.UseCharacterAsUser = true; // Make sure we trigger a refresh of suggested items.
_lastTextEdit.Text = string.Empty + args.Character;
UpdateCurrentTextEdit(_lastTextEdit);
lastContainer._autoSuggestTextBox.SelectionStart = 1; // Set position to after our new character inserted
lastContainer._autoSuggestTextBox.Focus(FocusState.Keyboard);
}
else
{
//// Otherwise, create a new textbox for this text.
UpdateCurrentTextEdit(new PretokenStringContainer((string.Empty + args.Character).Trim())); // Trim so that 'space' isn't inserted and can be used to insert a new box.
_innerItemsSource.Insert(index, _currentTextEdit);
// Need to wait for containerization
_ = dispatcherQueue.EnqueueAsync(
() =>
{
var newContainer = ContainerFromIndex(index) as TokenizingTextBoxItem; // Should be our last text box
newContainer.UseCharacterAsUser = true; // Make sure we trigger a refresh of suggested items.
void WaitForLoad(object s, RoutedEventArgs eargs)
{
if (newContainer._autoSuggestTextBox != null)
{
newContainer._autoSuggestTextBox.SelectionStart = 1; // Set position to after our new character inserted
newContainer._autoSuggestTextBox.Focus(FocusState.Keyboard);
}
newContainer.Loaded -= WaitForLoad;
}
newContainer.AutoSuggestTextBoxLoaded += WaitForLoad;
}, DispatcherQueuePriority.Normal);
}
}, DispatcherQueuePriority.Normal);
}
else
{
// If no items are selected, send input to the last active string container.
// This code is only fires during an edgecase where an item is in the process of being deleted and the user inputs a character before the focus has been redirected to a string container.
if (_innerItemsSource[_innerItemsSource.Count - 1] is ITokenStringContainer textToken)
{
var last = ContainerFromIndex(Items.Count - 1) as TokenizingTextBoxItem; // Should be our last text box
var text = last._autoSuggestTextBox.Text;
var selectionStart = last._autoSuggestTextBox.SelectionStart;
var position = selectionStart > text.Length ? text.Length : selectionStart;
textToken.Text = text.Substring(0, position) + args.Character +
text.Substring(position);
last._autoSuggestTextBox.SelectionStart = position + 1; // Set position to after our new character inserted
last._autoSuggestTextBox.Focus(FocusState.Keyboard);
}
}
}
}
