public static CommandBinding CreateCommandBinding(TextBox textBox, TextCommandType textCommandType)
{
var key = new Key<TextBox, TextCommandType>(textBox, textCommandType);
if (_commandBindingDictionary.ContainsKey(key))
{
return _commandBindingDictionary[key];
}
var commandBinding = new CommandBinding(GetCommand(textCommandType),
GetExecuteEventHandler(textBox, textCommandType),
GetCanExecuteEventHandler(textBox, textCommandType));
_commandBindingDictionary[key] = commandBinding;
return commandBinding;
}
private static RoutedUICommand GetCommand(TextCommandType textCommandType)
{
switch (textCommandType)
{
case TextCommandType.TrimAll:
return TextCommands.Trim;
case TextCommandType.TrimEnd:
return TextCommands.TrimEnd;
case TextCommandType.TrimStart:
return TextCommands.TrimStart;
default:
throw new ArgumentOutOfRangeException(nameof(textCommandType), textCommandType, null);
}
}
private static CanExecuteRoutedEventHandler GetCanExecuteEventHandler(TextBox textBox,
TextCommandType textCommandType)
{
switch (textCommandType)
{
case TextCommandType.TrimAll:
case TextCommandType.TrimEnd:
case TextCommandType.TrimStart:
return
delegate(object sender, CanExecuteRoutedEventArgs e)
{
e.CanExecute = !string.IsNullOrEmpty(textBox.Text);
};
default:
throw new ArgumentOutOfRangeException(nameof(textCommandType), textCommandType, null);
}
}
private static ExecutedRoutedEventHandler GetExecuteEventHandler(TextBox textBox,
TextCommandType textCommandType)
{
switch (textCommandType)
{
case TextCommandType.TrimAll:
return
delegate { textBox.Text = TextProcessor.TrimAllLines(textBox.Text, TrimmingPosition.TrimAll); };
case TextCommandType.TrimEnd:
return
delegate { textBox.Text = TextProcessor.TrimAllLines(textBox.Text, TrimmingPosition.TrimEnd); };
case TextCommandType.TrimStart:
return
delegate
{
textBox.Text = TextProcessor.TrimAllLines(textBox.Text, TrimmingPosition.TrimStart);
};
default:
throw new ArgumentOutOfRangeException(nameof(textCommandType), textCommandType, null);
}
}
private static void CheckCommandBinding(
TextBox textBox, TextCommandFlags textCommandFlags,
IEnumerable<CommandBinding> commandBindings, CommandBindingCollection commandBindingCollection,
RoutedUICommand command, TextCommandFlags commandFlag, TextCommandType commandType)
{
var commandBinding = commandBindings.FirstOrDefault(cb => cb.Command == command);
if (textCommandFlags.HasFlag(commandFlag) && commandBinding == null)
{
commandBindingCollection.Add(TextCommandBindings.CreateCommandBinding(textBox, commandType));
}
else if (!textCommandFlags.HasFlag(commandFlag) && commandBinding != null)
{
commandBindingCollection.Remove(commandBinding);
}
}
