AppKit.TextKit.Formatter.SourceTextView.KeyDown C# (CSharp) Method

		public override void KeyDown (NSEvent theEvent)
		{
			NSRange range = new NSRange(0, 0);
			string line = "";
			int indentLevel = 0;
			bool consumeKeystroke = false;

			// Avoid processing if no Formatter has been attached
			if (Formatter == null) return;

			// Trap all errors
			try {
				// Get the code of current character
				var c = theEvent.Characters [0];
				var charCode = (int)theEvent.Characters [0];

				// Preprocess based on character code
				switch(charCode) {
				case EnterKey:
					// Get the tab indent level
					range = Formatter.FindLineBoundries(TextStorage.Value, SelectedRange);
					line = TextStorage.Value.Substring((int)range.Location, (int)range.Length);
					indentLevel = CalculateIndentLevel(line);
					break;
				case TabKey:
					// Is a range selected?
					if (SelectedRange.Length > 0 ) {
						// Increase tab indent over the entire selection
						IndentText();
						consumeKeystroke = true;
					}
					break;
				case ShiftTabKey:
					// Is a range selected?
					if (SelectedRange.Length > 0 ) {
						// Increase tab indent over the entire selection
						OutdentText();
						consumeKeystroke = true;
					}
					break;
				default:
					// Are we completing closures
					if (CompleteClosures) {
						if (WrapClosures && SelectedRange.Length > 0) {
							// Yes, see if we are starting a closure
							foreach(LanguageClosure closure in Formatter.Language.Closures) {
								// Found?
								if (closure.StartingCharacter == c) {
									// Yes, get selected text
									var location = SelectedRange.Location;
									line = TextStorage.Value.Substring((int)SelectedRange.Location, (int)SelectedRange.Length);
									var output = "";
									output += closure.StartingCharacter;
									output += line;
									output += closure.EndingCharacter;
									TextStorage.BeginEditing();
									Replace(SelectedRange, output);
									TextStorage.EndEditing();
									if (SelectAfterWrap) {
										SelectedRange = new NSRange(location, output.Length);
									}
									consumeKeystroke = true;
									Formatter.HighlightSyntaxRegion(TextStorage.Value, SelectedRange);
								}
							}
						} else {
							// Yes, see if we are in a language defined closure
							foreach(LanguageClosure closure in Formatter.Language.Closures) {
								// Found?
								if (closure.StartingCharacter == c) {
									// Is this a valid location for a completion?
									if (Formatter.TrailingCharacterIsWhitespaceOrTerminator(TextStorage.Value, SelectedRange)) {
										// Yes, complete closure
										consumeKeystroke = true;
										var output = "";
										output += closure.StartingCharacter;
										output += closure.EndingCharacter;
										TextStorage.BeginEditing();
										InsertText(new NSString(output));
										TextStorage.EndEditing();
										SelectedRange = new NSRange(SelectedRange.Location - 1, 0);
									}
								}
							}
						}
					}
					break;
				}

				// Call base to handle event
				if (!consumeKeystroke)
					base.KeyDown (theEvent);

				// Post process based on character code
				switch(charCode) {
				case EnterKey:
					// Tab indent the new line to the same level
					if (indentLevel >0) {
						var indent = TabIndent(indentLevel);
						TextStorage.BeginEditing();
						InsertText(new NSString(indent));
						TextStorage.EndEditing();
					}
					break;
				}
			} catch {
				// Call base to process on any error
				base.KeyDown (theEvent);
			}

			//Console.WriteLine ("Key: {0}", (int)theEvent.Characters[0]);
		}