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//------------------------------------------------------------------------------
// <copyright file="LinkArea.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
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;
/// <include file='doc\LinkArea.uex' path='docs/doc[@for="LinkArea"]/*' />
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
[
TypeConverterAttribute(typeof(LinkArea.LinkAreaConverter)),
Serializable
]
public struct LinkArea {
int start;
int length;
/// <include file='doc\LinkArea.uex' path='docs/doc[@for="LinkArea.LinkArea"]/*' />
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public LinkArea(int start, int length) {
this.start = start;
this.length = length;
}
/// <include file='doc\LinkArea.uex' path='docs/doc[@for="LinkArea.Start"]/*' />
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public int Start {
get {
return start;
}
set {
start = value;
}
}
/// <include file='doc\LinkArea.uex' path='docs/doc[@for="LinkArea.Length"]/*' />
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public int Length {
get {
return length;
}
set {
length = value;
}
}
/// <include file='doc\LinkArea.uex' path='docs/doc[@for="LinkArea.IsEmpty"]/*' />
[Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public bool IsEmpty {
get {
return length == start && start == 0;
}
}
/// <include file='doc\LinkArea.uex' path='docs/doc[@for="LinkArea.Equals"]/*' />
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);
}
/// <include file='doc\LinkArea.uex' path='docs/doc[@for="LinkArea.GetHashCode"]/*' />
public override int GetHashCode() {
return start << 4 | length;
}
/// <include file='doc\LinkArea.uex' path='docs/doc[@for="LinkArea.LinkAreaConverter"]/*' />
/// <devdoc>
/// LinkAreaConverter is a class that can be used to convert
/// LinkArea from one data type to another. Access this
/// class through the TypeDescriptor.
/// </devdoc>
public class LinkAreaConverter : TypeConverter {
/// <include file='doc\LinkArea.uex' path='docs/doc[@for="LinkArea.LinkAreaConverter.CanConvertFrom"]/*' />
/// <devdoc>
/// Determines if this converter can convert an object in the given source
/// type to the native type of the converter.
/// </devdoc>
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
if (sourceType == typeof(string)) {
return true;
}
return base.CanConvertFrom(context, sourceType);
}
/// <include file='doc\LinkArea.uex' path='docs/doc[@for="LinkArea.LinkAreaConverter.CanConvertTo"]/*' />
/// <devdoc>
/// <para>Gets a value indicating whether this converter can
/// convert an object to the given destination type using the context.</para>
/// </devdoc>
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
if (destinationType == typeof(InstanceDescriptor)) {
return true;
}
return base.CanConvertTo(context, destinationType);
}
/// <include file='doc\LinkArea.uex' path='docs/doc[@for="LinkArea.LinkAreaConverter.ConvertFrom"]/*' />
/// <devdoc>
/// Converts the given object to the converter's native type.
/// </devdoc>
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);
}
/// <include file='doc\LinkArea.uex' path='docs/doc[@for="LinkArea.LinkAreaConverter.ConvertTo"]/*' />
/// <devdoc>
/// 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.
/// </devdoc>
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);
}
/// <include file='doc\LinkArea.uex' path='docs/doc[@for="LinkArea.LinkAreaConverter.CreateInstance"]/*' />
/// <devdoc>
/// 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.
/// </devdoc>
public override object CreateInstance(ITypeDescriptorContext context, IDictionary propertyValues) {
return new LinkArea((int)propertyValues["Start"],
(int)propertyValues["Length"]);
}
/// <include file='doc\LinkArea.uex' path='docs/doc[@for="LinkArea.LinkAreaConverter.GetCreateInstanceSupported"]/*' />
/// <devdoc>
/// Determines if changing a value on this object should require a call to
/// CreateInstance to create a new value.
/// </devdoc>
public override bool GetCreateInstanceSupported(ITypeDescriptorContext context) {
return true;
}
/// <include file='doc\LinkArea.uex' path='docs/doc[@for="LinkArea.LinkAreaConverter.GetProperties"]/*' />
/// <devdoc>
/// 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.
/// </devdoc>
public override PropertyDescriptorCollection GetProperties(ITypeDescriptorContext context, object value, Attribute[] attributes) {
PropertyDescriptorCollection props = TypeDescriptor.GetProperties(typeof(LinkArea), attributes);
return props.Sort(new string[] {"Start", "Length"});
}
/// <include file='doc\LinkArea.uex' path='docs/doc[@for="LinkArea.LinkAreaConverter.GetPropertiesSupported"]/*' />
/// <devdoc>
/// Determines if this object supports properties. By default, this
/// is false.
/// </devdoc>
public override bool GetPropertiesSupported(ITypeDescriptorContext context) {
return true;
}
}
}
}
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