IVerticalFractionMap Interface

Maps between character positions and fractions of the total vertical extent of an ITextView.

Namespace:  Microsoft.VisualStudio.Text.Editor
Assembly:  Microsoft.VisualStudio.Text.UI (in Microsoft.VisualStudio.Text.UI.dll)

public interface IVerticalFractionMap

The IVerticalFractionMap type exposes the following members.

Public propertyTextViewGets the text view to which this fraction map applies.

Public methodGetBufferPositionAtFractionGets the buffer position that corresponds to a fraction of the vertical extent of the view, if it exists.
Public methodGetFractionAtBufferPositionGets the fraction of the vertical extent of the view that corresponds to the specified buffer position.

Public eventMappingChangedOccurs when the mapping has changed between a character position and its vertical fraction. For example, the view may have re-rendered some lines, changing their font size.

Valid text positions range are [0...TextView.TextSnapshot.Length]. Valid scrollbar coordinates are [0.0 ... 1.0]. 0.0 corresponds to the top of the first line in the text view, and 1.0 corresponds to the bottom of the last line in the view.

Not every text position has a unique value. For example, every character on the same text buffer line has the same value, assuming that word wrap is not enabled. This interface is the base type of the IScrollMap interface, which is created using the IScrollMapFactoryService.

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