大家好，我一直在开发一个带有文本编辑器的 WPF 应用程序，这个文本编辑器应该在一些标记（关键字）上应用一些样式或着色以突出显示它并使其明显，问题是我非常努力但是我仍然得到相同的结果，即当用户输入其中一个关键字时，该关键字被设置样式之后的整个文本！想象一下，如果您在“C#”中键入“string”关键字，那么整个文本将被染成蓝色。
这是我使用的代码：
static List<string> tags = new List<string>(); static List<char> specials = new List<char>(); static string text; #region ctor static MainWindow() { string[] specialWords = { "string", "char", "null" }; tags = new List<string>(specialWords); // We also want to know all possible delimiters so adding this stuff. char[] chrs = { '.', ')', '(', '[', ']', '>', '<', ':', ';', '\n', '\t', '\r' }; specials = new List<char>(chrs); } public MainWindow() { InitializeComponent(); } #endregion //Now I should check statically if the string I passed is legal and constants in my dictionary public static bool IsKnownTag(string tag) { return tags.Exists(delegate(string s) { return s.ToLower().Equals(tag.ToLower()); }); } private static bool GetSpecials(char i) { foreach (var item in specials) { if (item.Equals(i)) { return true; } } return false; } // Wow. Great. Now I should separate words, that equals to my tags. For this propose we'll create new internal structure named Tag. This will help us to save words and its' positions. new struct Tag { public TextPointer StartPosition; public TextPointer EndPosition; public string Word; } internal void CheckWordsInRun(Run theRun){ //How, let's go through our text and save all tags we have to save. int sIndex = 0; int eIndex = 0; List<Tag> m_tags = new List<Tag>(); for (int i = 0; i < text.Length; i++) { if (Char.IsWhiteSpace(text[i]) | GetSpecials(text[i])) { if (i > 0 && !(Char.IsWhiteSpace(text[i - 1]) | GetSpecials(text[i - 1]))) { eIndex = i - 1; string word = text.Substring(sIndex, eIndex - sIndex + 1); if (IsKnownTag(word)) { Tag t = new Tag(); t.StartPosition = theRun.ContentStart.GetPositionAtOffset(sIndex, LogicalDirection.Forward); t.EndPosition = theRun.ContentStart.GetPositionAtOffset(eIndex + 1, LogicalDirection.Backward); t.Word = word; m_tags.Add(t); } } sIndex = i + 1; } } //How this works. But wait. If the word is last word in my text I'll never hightlight it, due I'm looking for separators. Let's add some fix for this case string lastWord = text.Substring(sIndex, text.Length - sIndex); if (IsKnownTag(lastWord)) { Tag t = new Tag(); t.StartPosition = theRun.ContentStart.GetPositionAtOffset(sIndex, LogicalDirection.Forward); t.EndPosition = theRun.ContentStart.GetPositionAtOffset(eIndex + 1, LogicalDirection.Backward); t.Word = lastWord; m_tags.Add(t); } //How I have all my words and its' positions in list. Let's color it! Dont forget to unsubscribe! text styling fires TextChanged event. txtStatus.TextChanged -= txtStatus_TextChanged; for (int i = 0; i < m_tags.Count; i++) { try { TextRange range = new TextRange(m_tags[i].StartPosition, m_tags[i].EndPosition); range.ApplyPropertyValue(TextElement.ForegroundProperty, new SolidColorBrush(Colors.Blue)); range.ApplyPropertyValue(TextElement.FontWeightProperty, FontWeights.Bold); } catch { } } m_tags.Clear(); txtStatus.TextChanged += txtStatus_TextChanged; }
这是文本更改的事件处理程序
private void txtStatus_TextChanged(object sender, TextChangedEventArgs e) { if (txtStatus.Document == null) return; TextRange documentRange = new TextRange(txtStatus.Document.ContentStart, txtStatus.Document.ContentEnd); //documentRange.ClearAllProperties(); text = documentRange.Text; //Now let's create navigator to go though the text and hightlight it TextPointer navigator = txtStatus.Document.ContentStart; while (navigator.CompareTo(txtStatus.Document.ContentEnd) < 0) { TextPointerContext context = navigator.GetPointerContext(LogicalDirection.Backward); if (context == TextPointerContext.ElementStart && navigator.Parent is Run) { CheckWordsInRun((Run)navigator.Parent); } navigator = navigator.GetNextContextPosition(LogicalDirection.Forward); } }
任何建议或手将不胜感激，在此先感谢。