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ITextView Interface

Represents a view of text in an ITextBuffer. It is the base class for a platform-specific interface that has methods to allow the formatted text to be rendered.

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

Syntax

'Declaration
Public Interface ITextView _
    Inherits IPropertyOwner
public interface ITextView : IPropertyOwner
public interface class ITextView : IPropertyOwner
type ITextView =  
    interface
        interface IPropertyOwner
    end
public interface ITextView extends IPropertyOwner

The ITextView type exposes the following members.

Properties

  Name Description
Public property BufferGraph Gets the IBufferGraph that contains the set of source buffers that contribute to this view.
Public property Caret Gets the caret element.
Public property HasAggregateFocus Determines whether the view or any of its adornments has focus.
Public property InLayout Determines whether the view is in the process of being laid out.
Public property IsClosed Determines whether this text view has been closed.
Public property IsMouseOverViewOrAdornments Determines whether the mouse is over the view or any of its adornments.
Public property LineHeight Gets the nominal height of a line of text in the view.
Public property MaxTextRightCoordinate Gets the right coordinate of the longest line, whether or not that line is currently visible, in logical pixels.
Public property Options Gets the options for this text view.
Public property Properties Gets the collection of properties controlled by the property owner. (Inherited from IPropertyOwner.)
Public property ProvisionalTextHighlight Gets the span of text covered by the provisional text highlight.
Public property Roles The roles which this view plays. Roles partially determine the extensions that are instantiated for the view.
Public property Selection Gets the selection element.
Public property TextBuffer Gets the ITextBuffer whose text is rendered in this view.
Public property TextDataModel Gets the ITextDataModel of this text view.
Public property TextSnapshot Gets the ITextSnapshot of the text that is currently rendered in the view.
Public property TextViewLines Gets a read-only list of the ITextViewLine objects rendered in this view.
Public property TextViewModel Gets the ITextViewModel of this text view.
Public property ViewportBottom Gets the position of the bottom edge of the viewpoint in the text rendering coordinate system.
Public property ViewportHeight Gets the height of the visible content window (including the margin) in logical pixels.
Public property ViewportLeft Gets or sets the position of the left edge of the viewpoint in the text rendering coordinate system.
Public property ViewportRight Gets the position of the right edge of the viewpoint in the text rendering coordinate system.
Public property ViewportTop Gets the position of the top edge of the viewpoint in the text rendering coordinate system.
Public property ViewportWidth Gets the width of the visible content window (including the margin) in logical pixels.
Public property ViewScroller Gets a helper that provides various methods to scroll or manipulate the view.
Public property VisualSnapshot Gets the ITextSnapshot of the visual buffer that is being rendered.

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Methods

  Name Description
Public method Close Closes the text view host and its view.
Public method DisplayTextLineContainingBufferPosition(SnapshotPoint, Double, ViewRelativePosition) Formats and displays the contents of the text buffer so that the ITextViewLine containing the buffer position is displayed at the desired position.
Public method DisplayTextLineContainingBufferPosition(SnapshotPoint, Double, ViewRelativePosition, Nullable<Double>, Nullable<Double>) Formats and displays the contents of the text buffer so that the ITextViewLine containing the specified buffer position is displayed at the desired position.
Public method GetTextElementSpan Gets the SnapshotSpan of text that constitutes a text element (a single visual representation) at the given SnapshotPoint.
Public method GetTextViewLineContainingBufferPosition Gets the ITextViewLine that contains the specified text buffer position.
Public method QueueSpaceReservationStackRefresh Requests a refresh of the space reservation stack.

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Events

  Name Description
Public event Closed Occurs immediately after the text view is closed.
Public event GotAggregateFocus Occurs when the keyboard focus switches to the view or one of its adornments.
Public event LayoutChanged Occurs when the text editor performs a text line layout.
Public event LostAggregateFocus Occurs when the keyboard focus switches away from the view and any of its adornments.
Public event MouseHover Occurs when the mouse has hovered over a character.
Public event ViewportHeightChanged Occurs when the viewport height is changed. Deprecated.
Public event ViewportLeftChanged Occurs when the position of the viewport left edge is changed. Deprecated
Public event ViewportWidthChanged Occurs when the viewport width is changed. Deprecated.

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Remarks

A text view is a platform-independent representation of a contiguous block of formatted and adorned text. The text can be accessed through the TextViewLines property.

For more information about text views, see the section "The Text View" in Inside the Editor.

The text view also instantiates an instance of an IEditorOperations component part so that it can execute various commands.

The text is formatted based on the classifiers that are attached to the underlying ITextBuffer.

Most properties and parameters that are doubles correspond to coordinates or distances in the text rendering coordinate system. In this coordinate system, x = 0.0 corresponds to the left edge of the drawing surface onto which text is rendered (x = view.ViewportLeft corresponds to the left edge of the viewport), and y = view.ViewportTop corresponds to the top edge of the viewport. The x-coordinate increases from left to right, and the y-coordinate increases from top to bottom. The horizontal and vertical axes of the view behave differently. When the text in the view is formatted, only the visible lines are formatted. As a result, a viewport cannot be scrolled horizontally and vertically in the same way. A viewport is scrolled horizontally by changing the left coordinate of the viewport so that it moves with respect to the drawing surface. A view can be scrolled vertically only by performing a new layout. Doing a layout in the view may cause the ViewportTop property of the view to change.

For example, scrolling down one line will not translate any of the visible lines. Instead it will simply change the ViewportTop property, which causes the lines to move on the screen even though their y-coordinates have not changed. Distances in the text rendering coordinate system correspond to logical pixels. If the text rendering surface is displayed without any scaling transform, then one unit in the text rendering coordinate system corresponds to one pixel in the display.

See Also

Reference

Microsoft.VisualStudio.Text.Editor Namespace