Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / GridLength.cs / 1305600 / GridLength.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: Grid length implementation // // See spec at http://avalon/layout/Specs/Star%20LengthUnit.mht // // History: // 09/24/2003 : olego - Created (in griddy prototype branch); // 10/27/2003 : olego - Ported from griddy prototype branch; // //--------------------------------------------------------------------------- using MS.Internal; using System.ComponentModel; using System.Globalization; namespace System.Windows { ////// GridUnitType enum is used to indicate what kind of value the /// GridLength is holding. /// // Note: Keep the GridUnitType enum in [....] with the string representation // of units (GridLengthConverter._unitString). public enum GridUnitType { ////// The value indicates that content should be calculated without constraints. /// Auto = 0, ////// The value is expressed as a pixel. /// Pixel, ////// The value is expressed as a weighted proportion of available space. /// Star, } ////// GridLength is the type used for various length-like properties in the system, /// that explicitely support Star unit type. For example, "Width", "Height" /// properties of ColumnDefinition and RowDefinition used by Grid. /// [TypeConverter(typeof(GridLengthConverter))] public struct GridLength : IEquatable{ //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors /// /// Constructor, initializes the GridLength as absolute value in pixels. /// /// Specifies the number of 'device-independent pixels' /// (96 pixels-per-inch). ////// If public GridLength(double pixels) : this(pixels, GridUnitType.Pixel) { } ///pixels parameter isdouble.NaN /// orpixels parameter isdouble.NegativeInfinity /// orpixels parameter isdouble.PositiveInfinity . ////// Constructor, initializes the GridLength and specifies what kind of value /// it will hold. /// /// Value to be stored by this GridLength /// instance. /// Type of the value to be stored by this GridLength /// instance. ////// If the ///type parameter isGridUnitType.Auto , /// then passed in value is ignored and replaced with0 . ////// If public GridLength(double value, GridUnitType type) { if (DoubleUtil.IsNaN(value)) { throw new ArgumentException(SR.Get(SRID.InvalidCtorParameterNoNaN, "value")); } if (double.IsInfinity(value)) { throw new ArgumentException(SR.Get(SRID.InvalidCtorParameterNoInfinity, "value")); } if ( type != GridUnitType.Auto && type != GridUnitType.Pixel && type != GridUnitType.Star ) { throw new ArgumentException(SR.Get(SRID.InvalidCtorParameterUnknownGridUnitType, "type")); } _unitValue = (type == GridUnitType.Auto) ? 0.0 : value; _unitType = type; } #endregion Constructors //------------------------------------------------------ // // Public Methods // //----------------------------------------------------- #region Public Methods ///value parameter isdouble.NaN /// orvalue parameter isdouble.NegativeInfinity /// orvalue parameter isdouble.PositiveInfinity . ////// Overloaded operator, compares 2 GridLength's. /// /// first GridLength to compare. /// second GridLength to compare. ///true if specified GridLengths have same value /// and unit type. public static bool operator == (GridLength gl1, GridLength gl2) { return ( gl1.GridUnitType == gl2.GridUnitType && gl1.Value == gl2.Value ); } ////// Overloaded operator, compares 2 GridLength's. /// /// first GridLength to compare. /// second GridLength to compare. ///true if specified GridLengths have either different value or /// unit type. public static bool operator != (GridLength gl1, GridLength gl2) { return ( gl1.GridUnitType != gl2.GridUnitType || gl1.Value != gl2.Value ); } ////// Compares this instance of GridLength with another object. /// /// Reference to an object for comparison. ///override public bool Equals(object oCompare) { if(oCompare is GridLength) { GridLength l = (GridLength)oCompare; return (this == l); } else return false; } /// true if this GridLength instance has the same value /// and unit type as oCompare./// Compares this instance of GridLength with another instance. /// /// Grid length instance to compare. ///public bool Equals(GridLength gridLength) { return (this == gridLength); } /// true if this GridLength instance has the same value /// and unit type as gridLength./// ////// public override int GetHashCode() { return ((int)_unitValue + (int)_unitType); } /// /// Returns public bool IsAbsolute { get { return (_unitType == GridUnitType.Pixel); } } ///true if this GridLength instance holds /// an absolute (pixel) value. ////// Returns public bool IsAuto { get { return (_unitType == GridUnitType.Auto); } } ///true if this GridLength instance is /// automatic (not specified). ////// Returns public bool IsStar { get { return (_unitType == GridUnitType.Star); } } ///true if this GridLength instance holds weighted propertion /// of available space. ////// Returns value part of this GridLength instance. /// public double Value { get { return ((_unitType == GridUnitType.Auto) ? 1.0 : _unitValue); } } ////// Returns unit type of this GridLength instance. /// public GridUnitType GridUnitType { get { return (_unitType); } } ////// Returns the string representation of this object. /// public override string ToString() { return GridLengthConverter.ToString(this, CultureInfo.InvariantCulture); } #endregion Public Methods //------------------------------------------------------ // // Public Properties // //------------------------------------------------------ #region Public Properties ////// Returns initialized Auto GridLength value. /// public static GridLength Auto { get { return (s_auto); } } #endregion Public Properties //----------------------------------------------------- // // Private Fields // //------------------------------------------------------ #region Private Fields private double _unitValue; // unit value storage private GridUnitType _unitType; // unit type storage // static instance of Auto GridLength private static readonly GridLength s_auto = new GridLength(1.0, GridUnitType.Auto); #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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