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MatchesCriteriaCallback Delegate

Represents a function that is used to evaluate if a ContextNode object meets or fails a specified criteria.

Namespace:  System.Windows.Ink
Assembly:  IAWinFX (in IAWinFX.dll)

public delegate bool MatchesCriteriaCallback(
	ContextNode visitingNode,
	Object data


Type: System.Windows.Ink.ContextNode

The ContextNode to check against the criteria.

Type: System.Object

Optional data that can be used for the criteria.

Return Value

Type: System.Boolean
true if visitingNode matches the criteria; otherwise false.

The following example finds the collection of ContextNode objects in an InkAnalyzer, theInkAnalyzer, that satisfies the criteria specified in the MatchesCriteriaCallBack delegate function, LineIsLowerThan, by using an integer, yValue.

    lineIsLowerThanCallback = new MatchesCriteriaCallback(LineIsLowerThan);
ContextNodeCollection nodesBelowYValue =
    theInkAnalyzer.FindNodes(lineIsLowerThanCallback, yValue);

LineIsLowerThan returns a true if the ContextNode is a LineNode and if the bottom of the bounding box is lower than an integer that is passed in. Therefore, the nodesBelowYValue collection contains all lines with strokes below the value, yValue. Remember that higher y values appear lower on the screen.

public bool LineIsLowerThan(ContextNode node, object data)
    // Return false if not a line 
    if (!(node is LineNode))
        return false;

    // Check if bottom is lower than yValue passed in 
    double yValue = (double)data;
    return (node.Location.GetBounds().Bottom > yValue);

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.0