LinkArea.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / LinkArea.cs / 1 / LinkArea.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Windows.Forms { 
    using System; 
    using System.Reflection;
    using System.ComponentModel; 
    using System.ComponentModel.Design;
    using System.ComponentModel.Design.Serialization;
    using System.Globalization;
    using System.Collections; 

    ///  
    ///  
    ///    [To be supplied.]
    ///  
    [
        TypeConverterAttribute(typeof(LinkArea.LinkAreaConverter)),
        Serializable
    ] 
    public struct LinkArea {
        int start; 
        int length; 

        ///  
        /// 
        ///    [To be supplied.]
        /// 
        public LinkArea(int start, int length) { 
            this.start = start;
            this.length = length; 
        } 

        ///  
        /// 
        ///    [To be supplied.]
        /// 
        public int Start { 
            get {
                return start; 
            } 
            set {
                start = value; 
            }
        }

        ///  
        /// 
        ///    [To be supplied.] 
        ///  
        public int Length {
            get { 
                return length;
            }
            set {
                length = value; 
            }
        } 
 
        /// 
        [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] 
        public bool IsEmpty {
            get {
                return length == start && start == 0;
            } 
        }
        ///  
        public override bool Equals(object o) { 
            if (!(o is LinkArea)) {
                return false; 
            }

            LinkArea a = (LinkArea)o;
            return this == a; 
        }
 
        public override string ToString() { 
            return "{Start=" + Start.ToString(CultureInfo.CurrentCulture) + ", Length=" + Length.ToString(CultureInfo.CurrentCulture) + "}";
        } 

        public static bool operator == (LinkArea linkArea1, LinkArea linkArea2){
            return (linkArea1.start == linkArea2.start) && (linkArea1.length == linkArea2.length);
        } 

        public static bool operator != (LinkArea linkArea1, LinkArea linkArea2) { 
            return !(linkArea1 == linkArea2); 
        }
 
        /// 
        public override int GetHashCode() {
            return start << 4 | length;
        } 

        ///  
        ///  
        ///      LinkAreaConverter is a class that can be used to convert
        ///      LinkArea from one data type to another.  Access this 
        ///      class through the TypeDescriptor.
        /// 
        public class LinkAreaConverter : TypeConverter {
 
            /// 
            ///  
            ///      Determines if this converter can convert an object in the given source 
            ///      type to the native type of the converter.
            ///  
            public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
                if (sourceType == typeof(string)) {
                    return true;
                } 
                return base.CanConvertFrom(context, sourceType);
            } 
 
            /// 
            ///  
            ///    Gets a value indicating whether this converter can
            ///       convert an object to the given destination type using the context.
            /// 
            public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { 
                if (destinationType == typeof(InstanceDescriptor)) {
                    return true; 
                } 
                return base.CanConvertTo(context, destinationType);
            } 

            /// 
            /// 
            ///      Converts the given object to the converter's native type. 
            /// 
            public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) { 
 
                if (value is string) {
 
                    string text = ((string)value).Trim();

                    if (text.Length == 0) {
                        return null; 
                    }
                    else { 
 
                        // Parse 2 integer values.
                        // 
                        if (culture == null) {
                            culture = CultureInfo.CurrentCulture;
                        }
                        char sep = culture.TextInfo.ListSeparator[0]; 
                        string[] tokens = text.Split(new char[] {sep});
                        int[] values = new int[tokens.Length]; 
                        TypeConverter intConverter = TypeDescriptor.GetConverter(typeof(int)); 
                        for (int i = 0; i < values.Length; i++) {
                            values[i] = (int)intConverter.ConvertFromString(context, culture, tokens[i]); 
                        }

                        if (values.Length == 2) {
                            return new LinkArea(values[0], values[1]); 
                        }
                        else { 
                            throw new ArgumentException(SR.GetString(SR.TextParseFailedFormat, 
                                                                      text,
                                                                      "start, length")); 
                        }
                    }
                }
 
                return base.ConvertFrom(context, culture, value);
            } 
 
            /// 
            ///  
            ///      Converts the given object to another type.  The most common types to convert
            ///      are to and from a string object.  The default implementation will make a call
            ///      to ToString on the object if the object is valid and if the destination
            ///      type is string.  If this cannot convert to the desitnation type, this will 
            ///      throw a NotSupportedException.
            ///  
            public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { 
                if (destinationType == null) {
                    throw new ArgumentNullException("destinationType"); 
                }

                if (destinationType == typeof(string) && value is LinkArea) {
                    LinkArea pt = (LinkArea)value; 

                    if (culture == null) { 
                        culture = CultureInfo.CurrentCulture; 
                    }
                    string sep = culture.TextInfo.ListSeparator + " "; 
                    TypeConverter intConverter = TypeDescriptor.GetConverter(typeof(int));
                    string[] args = new string[2];
                    int nArg = 0;
 
                    args[nArg++] = intConverter.ConvertToString(context, culture, pt.Start);
                    args[nArg++] = intConverter.ConvertToString(context, culture, pt.Length); 
 
                    return string.Join(sep, args);
                } 
                if (destinationType == typeof(InstanceDescriptor) && value is LinkArea) {
                    LinkArea pt = (LinkArea)value;

                    ConstructorInfo ctor = typeof(LinkArea).GetConstructor(new Type[] {typeof(int), typeof(int)}); 
                    if (ctor != null) {
                        return new InstanceDescriptor(ctor, new object[] {pt.Start, pt.Length}); 
                    } 
                }
 
                return base.ConvertTo(context, culture, value, destinationType);
            }

            ///  
            /// 
            ///      Creates an instance of this type given a set of property values 
            ///      for the object.  This is useful for objects that are immutable, but still 
            ///      want to provide changable properties.
            ///  
            public override object CreateInstance(ITypeDescriptorContext context, IDictionary propertyValues) {
                return new LinkArea((int)propertyValues["Start"],
                                 (int)propertyValues["Length"]);
            } 

            ///  
            ///  
            ///      Determines if changing a value on this object should require a call to
            ///      CreateInstance to create a new value. 
            /// 
            public override bool GetCreateInstanceSupported(ITypeDescriptorContext context) {
                return true;
            } 

            ///  
            ///  
            ///      Retrieves the set of properties for this type.  By default, a type has
            ///      does not return any properties.  An easy implementation of this method 
            ///      can just call TypeDescriptor.GetProperties for the correct data type.
            /// 
            public override PropertyDescriptorCollection GetProperties(ITypeDescriptorContext context, object value, Attribute[] attributes) {
                PropertyDescriptorCollection props = TypeDescriptor.GetProperties(typeof(LinkArea), attributes); 
                return props.Sort(new string[] {"Start", "Length"});
            } 
 

            ///  
            /// 
            ///      Determines if this object supports properties.  By default, this
            ///      is false.
            ///  
            public override bool GetPropertiesSupported(ITypeDescriptorContext context) {
                return true; 
            } 

        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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LinkArea.cs source code in C# .NET

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