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IBufferGraph.MapDownToFirstMatch Method (SnapshotPoint, PointTrackingMode, Predicate<ITextSnapshot>, PositionAffinity)

Maps a position in the graph to a position in a matching buffer that is lower in the graph. Source buffers are considered to be lower than the projection buffers that consume them.

Namespace:  Microsoft.VisualStudio.Text.Projection
Assembly:  Microsoft.VisualStudio.Text.Data (in Microsoft.VisualStudio.Text.Data.dll)

Syntax

'Declaration
Function MapDownToFirstMatch ( _
    position As SnapshotPoint, _
    trackingMode As PointTrackingMode, _
    match As Predicate(Of ITextSnapshot), _
    affinity As PositionAffinity _
) As Nullable(Of SnapshotPoint)
Nullable<SnapshotPoint> MapDownToFirstMatch(
    SnapshotPoint position,
    PointTrackingMode trackingMode,
    Predicate<ITextSnapshot> match,
    PositionAffinity affinity
)
Nullable<SnapshotPoint> MapDownToFirstMatch(
    SnapshotPoint position, 
    PointTrackingMode trackingMode, 
    Predicate<ITextSnapshot^>^ match, 
    PositionAffinity affinity
)
abstract MapDownToFirstMatch : 
        position:SnapshotPoint * 
        trackingMode:PointTrackingMode * 
        match:Predicate<ITextSnapshot> * 
        affinity:PositionAffinity -> Nullable<SnapshotPoint> 
function MapDownToFirstMatch(
    position : SnapshotPoint, 
    trackingMode : PointTrackingMode, 
    match : Predicate<ITextSnapshot>, 
    affinity : PositionAffinity
) : Nullable<SnapshotPoint>

Parameters

  • match
    Type: Predicate<ITextSnapshot>

    The predicate that identifies the target buffer.

  • affinity
    Type: Microsoft.VisualStudio.Text.PositionAffinity

    If the mapping is ambiguous (the position is on a source span seam), determines whether the mapping should target the position immediately after the preceding character or immediately before the following character in the top buffer.

    This setting has no effect if the mapping is unambiguous.

Return Value

Type: Nullable<SnapshotPoint>
A point in a snapshot of the target buffer, or nulla null reference (Nothing in Visual Basic) if position does not map down to any buffer selected by match.

Exceptions

Exception Condition
ArgumentNullException

position.Snapshot or match is nulla null reference (Nothing in Visual Basic).

ArgumentOutOfRangeException

trackingMode is not a valid PointTrackingMode, or affinity is not a valid PositionAffinity.

Remarks

The match predicate is called on each text buffer in the buffer graph until it returns true. After that the predicate is not called again.

.NET Framework Security

See Also

Reference

IBufferGraph Interface

MapDownToFirstMatch Overload

Microsoft.VisualStudio.Text.Projection Namespace