SnapLine Class

Reference

Definition

Namespace:: System.Windows.Forms.Design.Behavior

Assembly:: System.Design.dll

Assembly:: System.Windows.Forms.Design.dll

Important

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Represents the horizontal and vertical line segments that are dynamically created in the user interface (UI) to assist in the design-time layout of controls in a container. This class cannot be inherited.

public ref class SnapLine sealed

public sealed class SnapLine

type SnapLine = class

Public NotInheritable Class SnapLine

Inheritance: Object
SnapLine

Remarks

The following table lists the common modes that visual design tools support to assist you with positioning and sizing controls on a design surface.

Mode	Description
Freeform	Enables you to freely lay out controls.
Grid	Displays a static overlaid grid that assists you in laying out controls.
Snapline	Displays guide lines that assist you in laying out the container's controls relative to each other. Snaplines originate from controls and their container.

The SnapLine class and related types help support the Snapline mode.

Snaplines are generated dynamically and automatically as a control edge moves near another control or near the boundaries of its container. This can occur when a control is added from the toolbox, or moved or resized by mouse operations or keyboard commands. Controls typically have both horizontal and vertical snaplines defined; for rectangular controls, these typically extend from all four edges.

The SnapLine class uses only a few properties to describe each snapline, as shown in the following table.

Property	Description
SnapLineType	Specifies the location and direction of the line with respect to its associated control. Typically, only snaplines of similar types will auto-align to each other.
Offset	Specifies the distance in pixels from the origin, which is the upper-left corner of the control, to where the snapline starts.
Priority	Specifies the relative importance of the snapline. During any given layout decision point, only the snaplines that are active and have the highest priority are displayed.
Filter	Defines custom categories of snaplines. This is an optional string.
IsHorizontal and IsVertical	Indicates whether a snapline has horizontal or vertical orientation, respectively.

The ControlDesigner class stores snaplines for its corresponding control type in the SnapLines property. This base class handling of snaplines will suffice for the majority of controls, as it defines the Left, Right, Top, and Bottom snaplines, which are aligned along the edges of the control. When you are developing a custom control, if this default organization does not suffice, override the SnapLines property of the class derived from ControlDesigner. For example, you may want to align the horizontal snaplines of text-based controls, such as labels, with the top and base lines of the text (instead of the top and bottom edges of the control).

The SnapLineType class cannot be derived from.

There is extensive support for this feature in Visual Studio, see Walkthrough: Arranging Controls on Windows Forms Using Snaplines.

Constructors

SnapLine(SnapLineType, Int32, SnapLinePriority)	Initializes a new instance of the SnapLine class using the specified snapline type, offset, and priority.
SnapLine(SnapLineType, Int32, String, SnapLinePriority)	Initializes a new instance of the SnapLine class using the specified snapline type, offset, filter name, and priority.
SnapLine(SnapLineType, Int32, String)	Initializes a new instance of the SnapLine class using the specified snapline type, offset, and filter name.
SnapLine(SnapLineType, Int32)	Initializes a new instance of the SnapLine class using the specified snapline type and offset.

Properties

Filter	Gets the programmer-defined filter category associated with this snapline.
IsHorizontal	Gets a value indicating whether the snapline has a horizontal orientation.
IsVertical	Gets a value indicating whether the snapline has a vertical orientation.
Offset	Gets the number of pixels that the snapline is offset from the origin of the associated control.
Priority	Gets a value indicating the relative importance of the snapline.
SnapLineType	Gets the type of a snapline, which indicates the general location and orientation.

Methods

AdjustOffset(Int32)	Adjusts the Offset property of the snapline.
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
ShouldSnap(SnapLine, SnapLine)	Returns a value indicating whether the specified SnapLine should snap to another SnapLine.
ToString()	Returns a string representation of the current snapline.

Applies to

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