WPF的FlowDocument"变化情况"特征 [英] WPF Flowdocument "change case" feature
问题描述
我实现我的RichTextBox像字更改大小写的功能与Shift + F3。它所做的就是较低>大写>标题的情况下，一旦我获得我所需要的字符串，这是非常简单的之间的切换。
我的问题是，如何改变（并发现它摆在首位）的FlowDocument的字符串，而不会丢失任何嵌入元素（失去格式不是问题）可能包含字符串中。
一样的话，我需要2例此功能：
1）鼠标选中的文本。我想简单地
this.Selection.Text = newText;
但是，这当然丢失了我的嵌入式元素。
2）前插入位置的最后一个字。任何非文本元素是一个单词分隔符，但一个字可以
他<奇怪的格式开始> LL<奇怪的格式结束≠0。
SOLUTION
这方式，它模仿MS WORD Shift + F3行为。只有在极少数情况下会出现的问题是被移动到字开头，而不是保持其位置CARRET。我想，EditingCommands.MoveLeftByWord.Execute经过短暂的睡眠（null，则此）;想解决这个问题，但是这将是一个肮脏的黑客，我试图找出一个更好的解决方案。
私人无效ChangeCase（ ）
{
试
{
TextPointer启动;
TextPointer结束;
FindSelectedRange（出开始，OUT端）;
名单，LT;&的TextRange GT; textToChange = SplitToTextRanges（开始，结束）;
ChangeCaseToAllRanges（textToChange）;
}
赶上（异常前）
{
mLog.Error（更改大小写错误，前）;
}
}
私人无效FindSelectedRange（出TextPointer开始，出TextPointer完）
{
如果（！ this.Selection.IsEmpty）
{
开始= this.Selection.Start;
端= this.Selection.End;
}
，否则
{
端= this.CaretPosition;
EditingCommands.MoveLeftByWord.Execute（null，则此）;
开始= this.CaretPosition;
this.CaretPosition =结束;
}
}
私人静态列表<&的TextRange GT; SplitToTextRanges（TextPointer开始，TextPointer结束）
{
名单，LT;&的TextRange GT; textToChange =新的List<&的TextRange GT;（）;
VAR previousPointer =启动;
为（VAR指针=启动; pointer.CompareTo（完）< = 0;指针= pointer.GetPositionAtOffset（1 LogicalDirection.Forward））
{
VAR contextAfter = pointer.GetPointerContext （LogicalDirection.Forward）;
VAR contextBefore = pointer.GetPointerContext（LogicalDirection.Backward）;
如果（contextBefore = TextPointerContext.Text和放大器;！&安培; contextAfter == TextPointerContext.Text）
{
previousPointer =指针;
}
如果（contextBefore == TextPointerContext.Text&放大器;&安培;！contextAfter = TextPointerContext.Text&放大器;&安培;！previousPointer =指针）
{
textToChange.Add（新的TextRange（previousPointer，指针））;
previousPointer = NULL;
}
}
textToChange.Add（新的TextRange（previousPointer ??结束，结束））;
返回textToChange;
}
私人无效ChangeCaseToAllRanges（列表<&的TextRange GT; textToChange）
{
VAR TextInfo中=（mCasingCulture ?? CultureInfo.CurrentUICulture）.TextInfo;
变种allText =的string.join（，textToChange.Select（X => x.Text）。凡（X =>！string.IsNullOrWhiteSpace（X）））;
Func键<字符串，字符串> caseChanger = GetConvertorToNextState（TextInfo中，allText）;
的foreach（在textToChange VAR范围）
{
如果（range.IsEmpty&安培;！&安培;！string.IsNullOrWhiteSpace（range.Text））
{
系列的.text = caseChanger（range.Text）;
}
}
}
私有静态Func键<字符串，字符串> GetConvertorToNextState（TextInfo中TextInfo中，字符串allText）
{
Func键<字符串，字符串> caseChanger;
如果（textInfo.ToLower（allText）== allText）
{
caseChanger =（文本）=> textInfo.ToTitleCase（文本）;
}
，否则如果（textInfo.ToTitleCase（textInfo.ToLower（allText））== allText）
{
caseChanger =（文本）=> textInfo.ToUpper（文本）;
}
，否则
{
caseChanger =（文本）=> textInfo.ToLower（文本）;
}
返回caseChanger;
}
I am implementing a "change case" functionality for my RichTextBox like word has with Shift+F3. All it does is switching between lower->upper->title case, which is very simple once I get access to the string I need.
My question is, how to change (and find it in the first place) a string in flowdocument without losing any embedded elements (losing formatting is not a problem) that may be contained within the string. Same as word, I need this functionality for 2 cases:
1) Mouse-selected text. I tried simply
this.Selection.Text = newText;
But that of course lost my embedded elements.
2) The last word before caret position. Any non-text element is a word delimiter, however one word can be
"He<weird formatting begin>ll<weird formatting end>o".
SOLUTION
This way it mimics MS WORD Shift+F3 behaviour. Only problem that in very few cases occurs is the carret being moved to the word beginning instead of keeping its position. I suppose that a short sleep after EditingCommands.MoveLeftByWord.Execute(null, this); would fix this, but this would be a dirty hack and I am trying to find out a nicer solution.
private void ChangeCase()
{
try
{
TextPointer start;
TextPointer end;
FindSelectedRange(out start, out end);
List<TextRange> textToChange = SplitToTextRanges(start, end);
ChangeCaseToAllRanges(textToChange);
}
catch (Exception ex)
{
mLog.Error("Change case error", ex);
}
}
private void FindSelectedRange(out TextPointer start, out TextPointer end)
{
if (!this.Selection.IsEmpty)
{
start = this.Selection.Start;
end = this.Selection.End;
}
else
{
end = this.CaretPosition;
EditingCommands.MoveLeftByWord.Execute(null, this);
start = this.CaretPosition;
this.CaretPosition = end;
}
}
private static List<TextRange> SplitToTextRanges(TextPointer start, TextPointer end)
{
List<TextRange> textToChange = new List<TextRange>();
var previousPointer = start;
for (var pointer = start; pointer.CompareTo(end) <= 0; pointer = pointer.GetPositionAtOffset(1, LogicalDirection.Forward))
{
var contextAfter = pointer.GetPointerContext(LogicalDirection.Forward);
var contextBefore = pointer.GetPointerContext(LogicalDirection.Backward);
if (contextBefore != TextPointerContext.Text && contextAfter == TextPointerContext.Text)
{
previousPointer = pointer;
}
if (contextBefore == TextPointerContext.Text && contextAfter != TextPointerContext.Text && previousPointer != pointer)
{
textToChange.Add(new TextRange(previousPointer, pointer));
previousPointer = null;
}
}
textToChange.Add(new TextRange(previousPointer ?? end, end));
return textToChange;
}
private void ChangeCaseToAllRanges(List<TextRange> textToChange)
{
var textInfo = (mCasingCulture ?? CultureInfo.CurrentUICulture).TextInfo;
var allText = String.Join(" ", textToChange.Select(x => x.Text).Where(x => !string.IsNullOrWhiteSpace(x)));
Func<string, string> caseChanger = GetConvertorToNextState(textInfo, allText);
foreach (var range in textToChange)
{
if (!range.IsEmpty && !string.IsNullOrWhiteSpace(range.Text))
{
range.Text = caseChanger(range.Text);
}
}
}
private static Func<string, string> GetConvertorToNextState(TextInfo textInfo, string allText)
{
Func<string, string> caseChanger;
if (textInfo.ToLower(allText) == allText)
{
caseChanger = (text) => textInfo.ToTitleCase(text);
}
else if (textInfo.ToTitleCase(textInfo.ToLower(allText)) == allText)
{
caseChanger = (text) => textInfo.ToUpper(text);
}
else
{
caseChanger = (text) => textInfo.ToLower(text);
}
return caseChanger;
}
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