WritingRegionNode.GetTextRangeFromNodes 方法

  • 项目

对于给定的 ContextNode 对象集合，此方法查找已识别字符串中相应的文本范围。

命名空间：  System.Windows.Ink
程序集：  IAWinFX（在 IAWinFX.dll 中）

语法

声明
Public Sub GetTextRangeFromNodes ( _
    subTree As ContextNodeCollection, _
    <OutAttribute> ByRef start As Integer, _
    <OutAttribute> ByRef length As Integer _
)
用法
Dim instance As WritingRegionNode
Dim subTree As ContextNodeCollection
Dim start As Integer
Dim length As Integer

instance.GetTextRangeFromNodes(subTree, _
    start, length)

public void GetTextRangeFromNodes(
    ContextNodeCollection subTree,
    out int start,
    out int length
)

public:
void GetTextRangeFromNodes(
    ContextNodeCollection^ subTree, 
    [OutAttribute] int% start, 
    [OutAttribute] int% length
)

public void GetTextRangeFromNodes(
    ContextNodeCollection subTree,
    /** @attribute OutAttribute */ /** @ref */int start,
    /** @attribute OutAttribute */ /** @ref */int length
)

public function GetTextRangeFromNodes(
    subTree : ContextNodeCollection, 
    start : int, 
    length : int
)

参数

备注

如果 subTree 包含的某个 ContextNode 不是 InkWritingNode 的后代，则引发 ArgumentException。

如果 subTree 包含的 ContextNode 对象不连续，则返回涵盖所有 ContextNode 对象的最小文本范围。

示例

下面的示例查找名为 writingRegion 的 WritingRegionNode 中的最后一段。然后查找对应于此段落的文本范围，并将 GetRecognizedString 的值放入名为 selectedResultsTextBox 的 TextBox，然后选中对应于最后一段的文本。

Dim paragraphs As ContextNodeCollection = theInkAnalyzer.FindNodesOfType(ContextNodeType.Paragraph)
Dim lastParagraph As ParagraphNode = Nothing
Dim maxY As Double = Double.MinValue
Dim paragraph As ParagraphNode
For Each paragraph In  paragraphs
    If paragraph.Location.GetBounds().Bottom > maxY Then
        maxY = paragraph.Location.GetBounds().Bottom
        lastParagraph = paragraph
    End If
Next paragraph

If lastParagraph Is Nothing Then
    Return
End If 
' Create a collection to hold this line
Dim lastParagraphCollection As New ContextNodeCollection(theInkAnalyzer)
lastParagraphCollection.Add(lastParagraph)

' Find corresponding start and length
Dim start, length As Integer
writingRegion.GetTextRangeFromNodes(lastParagraphCollection, start, length)

' Select this in the text box
selectedResultsTextBox.Text = writingRegion.GetRecognizedString()
selectedResultsTextBox.Select(start, length)

ContextNodeCollection paragraphs =
     theInkAnalyzer.FindNodesOfType(ContextNodeType.Paragraph);
ParagraphNode lastParagraph = null;
double maxY = double.MinValue;
foreach (ParagraphNode paragraph in paragraphs)
{
    if (paragraph.Location.GetBounds().Bottom > maxY)
    {
        maxY = paragraph.Location.GetBounds().Bottom;
        lastParagraph = paragraph;
    }
}

if (lastParagraph == null)
    return;

// Create a collection to hold this line
ContextNodeCollection lastParagraphCollection = new ContextNodeCollection(theInkAnalyzer);
lastParagraphCollection.Add(lastParagraph);

// Find corresponding start and length
int start, length;
writingRegion.GetTextRangeFromNodes(lastParagraphCollection, out start, out length);

// Select this in the text box
selectedResultsTextBox.Text = writingRegion.GetRecognizedString();
selectedResultsTextBox.Select(start, length);

平台

Windows Vista

.NET Framework 和 .NET Compact Framework 并不是对每个平台的所有版本都提供支持。有关支持的版本的列表，请参见.NET Framework 系统要求。

版本信息

.NET Framework

受以下版本支持：3.0

另请参见

参考

WritingRegionNode 类

WritingRegionNode 成员

System.Windows.Ink 命名空间