Thickness Structure (System.Windows)

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Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework 3.0

.NET Framework Class Library

Thickness Structure

Updated: November 2007

Describes the thickness of a frame around a rectangle. Four Double values describe the Left, Top, Right, and Bottom sides of the rectangle, respectively.

Namespace: System.Windows
Assembly: PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/xaml/presentation

Syntax

Visual Basic (Declaration)

<LocalizabilityAttribute(LocalizationCategory.None, Readability := Readability.Unreadable)> _
<TypeConverterAttribute(GetType(ThicknessConverter))> _
Public Structure Thickness _
    Implements IEquatable(Of Thickness)

Visual Basic (Usage)

Dim instance As Thickness

[LocalizabilityAttribute(LocalizationCategory.None, Readability = Readability.Unreadable)]
[TypeConverterAttribute(typeof(ThicknessConverter))]
public struct Thickness : IEquatable<Thickness>

Visual C++

[LocalizabilityAttribute(LocalizationCategory::None, Readability = Readability::Unreadable)]
[TypeConverterAttribute(typeof(ThicknessConverter))]
public value class Thickness : IEquatable<Thickness>

/** @attribute LocalizabilityAttribute(LocalizationCategory.None, Readability = Readability.Unreadable) */
/** @attribute TypeConverterAttribute(ThicknessConverter) */
public final class Thickness extends ValueType implements IEquatable<Thickness>

JScript

JScript supports the use of structures, but not the declaration of new ones.

XAML Object Element Usage

<Thickness .../>

XAML Attribute Usage

<object property="left"/>
- or -
<object property="left,top"/>
- or -
<object property=" left,top,right,bottom" ... />

XAML Values

left

                    The left edge of the frame, described as either a  Double value that specifies a device-independent units (1/96th inch per unit) measure, or as a qualifiedDouble (see below). If only a single measure is specified, that measure is applied to ALL of the left,top,right,bottom values of a Thickness. If only a pair of left,top measures are specified, these measures are applied symmetrically to a Thickness: the left value is used for right; the top value is used for bottom.
                
top

                    The top edge of the frame, described as either a  Double value that specifies a device-independent units (1/96th inch per unit) measure, or as a qualifiedDouble (see below). If only a pair of left,top measures are specified, these measures are applied symmetrically to a Thickness: the left value is used for right; the top value is used for bottom.
                
right

                    The right edge of the frame, described as either a  Double value that specifies a device-independent units (1/96th inch per unit) measure, or as a qualifiedDouble (see below). If left unspecified, will use the left value.
                
bottom

                    The bottom edge of the frame, described as either a  Double value that specifies a device-independent units (1/96th inch per unit) measure, or as a qualifiedDouble (see below). If left unspecified, will use the left value.
                
qualifiedDouble

                    A double value as described above for any of the measures, followed by one of the following unit declaration strings: px, in, cm, pt.
                
 px (default) is device-independent units (1/96th inch per unit)
                
 in is inches; 1in==96px
                
 cm is centimeters; 1cm==(96/2.54) px
                
 pt is points; 1pt==(96/72) px

Remarks

You can specify Thickness values in two ways. If you pass four Double values to the structure, they represent the Left, Top, Right and Bottom sides, respectively, of the bounding rectangle. You can also supply a single value, which applies a uniform value to all four sides of the bounding rectangle.

Examples

The following example shows how to create an instance of a Thickness structure and set its properties by using Extensible Application Markup Language (XAML) and code.

Visual Basic

Dim myBorder2 As New Border()
myBorder2.BorderBrush = Brushes.SteelBlue
myBorder2.Width = 400
myBorder2.Height = 400
Dim myThickness As New Thickness()
myThickness.Bottom = 5
myThickness.Left = 10
myThickness.Right = 15
myThickness.Top = 20
myBorder2.BorderThickness = myThickness

myBorder2 = new Border();
myBorder2.BorderBrush = Brushes.SteelBlue;
myBorder2.Width = 400;
myBorder2.Height = 400;
myThickness = new Thickness();
myThickness.Bottom = 5;
myThickness.Left = 10;
myThickness.Right = 15;
myThickness.Top = 20;
myBorder2.BorderThickness = myThickness;

XAML

<Border BorderBrush="SteelBlue" Width="400" Height="400" Canvas.Left="100" Canvas.Top="100">
  <Border.BorderThickness>
    10,20,15,5
  </Border.BorderThickness>
</Border>

More Code

How to: Set Margins of Elements and Controls	This example describes how to set the Margin property, by changing any existing property value for the margin in code-behind. The Margin property is a property of the FrameworkElement base element, and is thus inherited by a variety of controls and other elements. For the complete sample, see Setting Margins Sample.
How to: Use a ThicknessConverter Object	This example shows how to create an instance of ThicknessConverter and use it to change the thickness of a border.
How to: Animate the Thickness of a Border by Using Key Frames	This example shows how to animate the BorderThickness property of a Border.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

Windows Vista

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.

Version Information