InkAnalyzer.GetNodesFromTextRange 方法 (Int32%, Int32%)

2008-11-04

返回一个 ContextNodeCollection，其中包含与指定文本范围有关的 ContextNode 对象。

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

语法

声明
Public Function GetNodesFromTextRange ( _
    ByRef start As Integer, _
    ByRef length As Integer _
) As ContextNodeCollection
用法
Dim instance As InkAnalyzer
Dim start As Integer
Dim length As Integer
Dim returnValue As ContextNodeCollection

returnValue = instance.GetNodesFromTextRange(start, _
    length)

public ContextNodeCollection GetNodesFromTextRange(
    ref int start,
    ref int length
)

public:
ContextNodeCollection^ GetNodesFromTextRange(
    int% start, 
    int% length
)

public ContextNodeCollection GetNodesFromTextRange(
    /** @ref */int start,
    /** @ref */int length
)

public function GetNodesFromTextRange(
    start : int, 
    length : int
) : ContextNodeCollection

参数

start
类型：System.Int32%

length
类型：System.Int32%

返回值

类型：System.Windows.Ink.ContextNodeCollection
与指定文本范围有关的 ContextNode 对象的集合。

备注

指定的文本范围应相对于整个 InkAnalyzer 的已识别字符串。

此方法通过将文本范围扩展到最近的单词边界来修改 start 和 length 参数的值。例如，如果已识别字符串为“I am late”，则可通过将参数值 6 和 1 分别用于 start 和 length（这对应于“late”中的字母“a”）调用此方法。该方法返回仅包含单个 ContextNode（即 InkWordNode 或 TextWordNode）的集合。此示例中的方法还将 start 和 length 的值分别修改为 5 和 4（这对应于单词“late”）。

示例

此示例将名为 theResultsTextBox 的 TextBox 的 Text 属性从 InkAnalyzer (theInkAnalyzer) 的 GetRecognizedString() 所返回的值重置为文本框所选内容中的新值，这些值标记对应于文本框所选内容的 Strokes。

' Find out what's been selected in the text box
Dim selStart As Integer = theResultsTextBox.SelectionStart
Dim selLength As Integer = theResultsTextBox.SelectionLength

' Get the nodes that correspond to that range
Dim selectedSubNodes As ContextNodeCollection = _
    Me.theInkAnalyzer.GetNodesFromTextRange(selStart, selLength)

' Use the new start and length value to update the
' selection in the TextBox
theResultsTextBox.SelectionStart = selStart
theResultsTextBox.SelectionLength = selLength

' First, set all strokes to black
For Each theStroke As Stroke In Me.theInkAnalyzer.RootNode.Strokes
    theStroke.DrawingAttributes.Color = Colors.Black
Next theStroke

' Next, set all selected sub nodes to red
For Each theContextNode As ContextNode In selectedSubNodes
    For Each theStroke As Stroke In theContextNode.Strokes
        theStroke.DrawingAttributes.Color = Colors.Red
    Next theStroke
Next theContextNode

// Find out what's been selected in the text box
int selStart = theResultsTextBox.SelectionStart;
int selLength = theResultsTextBox.SelectionLength;

// Get the nodes that correspond to that range
ContextNodeCollection selectedSubNodes =
    this.theInkAnalyzer.GetNodesFromTextRange(
        ref selStart, ref selLength);

// Use the new start and length value to update the
// selection in the TextBox
theResultsTextBox.SelectionStart = selStart;
theResultsTextBox.SelectionLength = selLength;

// First, set all strokes to black
foreach (Stroke theStroke
    in this.theInkAnalyzer.RootNode.Strokes)
{
    theStroke.DrawingAttributes.Color = Colors.Black;
}

// Next, set all selected sub nodes to red
foreach (ContextNode theContextNode in selectedSubNodes)
{
    foreach (Stroke theStroke in theContextNode.Strokes)
    {
        theStroke.DrawingAttributes.Color = Colors.Red;
    }
}