/// <summary>
/// Gets the suggestions.
/// </summary>
/// <param name="basedOn">
/// String (as object) with the text on which the suggestions are based (i.e. the currently displayed
/// text).
/// </param>
/// <returns>
/// Returns an <see cref="T:System.Collections.ObjectModel.ObservableCollection`1" /> of strings containing the
/// suggestions.
/// </returns>
/// <remarks>
/// <para>
/// The suggestions are sorted by Presage. Configuration of Presage is done through an XML file located in its
/// installation folder.
/// </para>
/// <para>
/// Conversion between UTF8 (for this module) and Default encoding (for Presage) is performed when communicating
/// with the Presage Service.
/// </para>
/// </remarks>
public ObservableCollection <string> GetSuggestions(object basedOn)
{
var currentText = basedOn as string;
if (currentText == null)
{
return(new ObservableCollection <string>());
}
if ((this.channel.State != CommunicationState.Opened) && (this.channel.State != CommunicationState.Opening))
{
this.InitializeChannel();
}
string prefix, lastWord;
StringEditHelper.SplitStringPrefixAndLastWord(currentText, out prefix, out lastWord);
prefix = StringEditHelper.ConvertToDefaultEncodingFromUtf8(prefix);
lastWord = StringEditHelper.ConvertToDefaultEncodingFromUtf8(lastWord);
try
{
var result =
this.channel.predict(prefix, lastWord)
.Select(StringEditHelper.ConvertToUtf8FromDefaultEncoding)
.ToList();
return(new ObservableCollection <string>(result));
}
catch (Exception)
{
return(new ObservableCollection <string>());
}
}
private ObservableCollection <string> AddSpaceIfNecessary(ObservableCollection <string> collection)
{
var currentPrefix = StringEditHelper.RemoveLastWord(this.textModel.CurrentText);
var needsSpace = (currentPrefix.Length > 0) &&
!CharacterClasses.Whitespace.Contains(currentPrefix[currentPrefix.Length - 1]);
var result = collection.Select(
s =>
{
if (needsSpace)
{
s = " " + s;
}
return(s);
});
return(new ObservableCollection <string>(result));
}
private ObservableCollection <string> AddUppercaseIfNecessary(ObservableCollection <string> collection)
{
var currentPrefix = StringEditHelper.RemoveLastWord(this.textModel.CurrentText);
var trimmedPrefix = currentPrefix.Trim();
var needsUppercase = (this.textModel.CurrentText.Trim().Length == 0) || (trimmedPrefix.Length == 0) ||
CharacterClasses.FollowedByUppercase.Contains(
trimmedPrefix[trimmedPrefix.Length - 1]);
var result = collection.Select(
s =>
{
if (needsUppercase)
{
s = s.Length > 1 ? char.ToUpper(s[0]) + s.Substring(1) : s.ToUpper();
}
return(s);
});
return(new ObservableCollection <string>(result));
}
/// <summary>
/// Initializes a new instance of the <see cref="TextViewModel" /> class.
/// </summary>
/// <param name="eventAggregator">Provides pub/sub events (obtained through DI).</param>
public TextViewModel(IEventAggregator eventAggregator)
{
this.eventAggregator = eventAggregator;
this.AppendTextCommand = new DelegateCommand <string>(this.AppendText);
this.ClearTextCommand = new DelegateCommand(() => this.CurrentText = string.Empty);
this.RemoveLastCharacterCommand =
new DelegateCommand(
() =>
this.CurrentText =
this.CurrentText.Length > 0
? this.CurrentText.Remove(this.CurrentText.Length - 1)
: this.CurrentText,
() => this.CurrentText.Length > 0).ObservesProperty(() => this.CurrentText);
this.RemoveLastWordCommand =
new DelegateCommand(
() =>
{
this.CurrentText =
StringEditHelper.RemoveLastWord(this.CurrentText.TrimEnd(CharacterClasses.Whitespace));
});
this.RemoveLastWordWithoutTrimCommand =
new DelegateCommand(() => { this.CurrentText = StringEditHelper.RemoveLastWord(this.CurrentText); });
this.SaveTextCommand =
new DelegateCommand(() =>
{
var saveFileDialog = new SaveFileDialog();
saveFileDialog.Filter = "Text file (*.txt)|*.txt|All(*.*)|*";
if (saveFileDialog.ShowDialog() == true)
{
File.WriteAllText(saveFileDialog.FileName, this.CurrentText);
}
this.CurrentText = StringEditHelper.RemoveLastWord(this.CurrentText);
});
Commands.AppendTextCommand.RegisterCommand(this.AppendTextCommand);
Commands.ClearTextCommand.RegisterCommand(this.ClearTextCommand);
Commands.RemoveLastCharacterCommand.RegisterCommand(this.RemoveLastCharacterCommand);
Commands.RemoveLastWordCommand.RegisterCommand(this.RemoveLastWordCommand);
Commands.RemoveLastWordWithoutTrimCommand.RegisterCommand(this.RemoveLastWordWithoutTrimCommand);
Commands.SaveTextCommand.RegisterCommand(this.SaveTextCommand);
}
/// <summary>
/// Adds a suggestion.
/// </summary>
/// <param name="s">The suggestion.</param>
private void WriteSuggestion(string s)
{
if (string.IsNullOrEmpty(s))
{
return;
}
var currentText = this.textModel.CurrentText;
var lastWord = StringEditHelper.GetLastWord(currentText);
if (s.ToLower().StartsWith(lastWord.ToLower()))
{
Commands.RemoveLastWordWithoutTrimCommand.Execute(null);
}
else if (!StringEditHelper.EndsWithWhitespace(currentText))
{
Commands.AppendTextCommand.Execute(" ");
}
Commands.AppendTextCommand.Execute(s + " ");
}