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; ////// /// [ 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; } } ///[To be supplied.] ///[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); } ////// /// public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { if (destinationType == typeof(InstanceDescriptor)) { return true; } return base.CanConvertTo(context, destinationType); } ///Gets a value indicating whether this converter can /// convert an object to the given destination type using the context. ////// /// 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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