SizeFConverter.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / CommonUI / System / Drawing / Advanced / SizeFConverter.cs / 1 / SizeFConverter.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 */ 
namespace System.Drawing {
    using System.Runtime.Serialization.Formatters; 
    using System.Runtime.InteropServices;

    using System.Diagnostics;
 
    using Microsoft.Win32;
    using System.Collections; 
    using System.ComponentModel; 
    using System.ComponentModel.Design.Serialization;
    using System.Globalization; 
    using System.Reflection;
    using System.Diagnostics.CodeAnalysis;

    ///  
    /// 
    ///      SizeFConverter is a class that can be used to convert 
    ///      SizeF from one data type to another.  Access this 
    ///      class through the TypeDescriptor.
    ///  
    public class SizeFConverter : 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.
        /// 
        [SuppressMessage("Microsoft.Performance", "CA1808:AvoidCallsThatBoxValueTypes")] 
        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
 
            string strValue = value as string; 

            if (strValue != null) { 

                string text = strValue.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}); 
                    float[] values = new float[tokens.Length]; 
                    TypeConverter floatConverter = TypeDescriptor.GetConverter(typeof(float));
                    for (int i = 0; i < values.Length; i++) { 
                        values[i] = (float)floatConverter.ConvertFromString(context, culture, tokens[i]);
                    }

                    if (values.Length == 2) { 
                        return new SizeF(values[0], values[1]);
                    } 
                    else { 
                        throw new ArgumentException(SR.GetString(SR.TextParseFailedFormat,
                                                                  text, 
                                                                  "Width,Height"));
                    }
                }
            } 

            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. 
        ///  
        [SuppressMessage("Microsoft.Performance", "CA1800:DoNotCastUnnecessarily")]
        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 SizeF) {
                SizeF size = (SizeF)value; 
 
                if (culture == null) {
                    culture = CultureInfo.CurrentCulture; 
                }
                string sep = culture.TextInfo.ListSeparator + " ";
                TypeConverter floatConverter = TypeDescriptor.GetConverter(typeof(float));
                string[] args = new string[2]; 
                int nArg = 0;
 
                args[nArg++] = floatConverter.ConvertToString(context, culture, size.Width); 
                args[nArg++] = floatConverter.ConvertToString(context, culture, size.Height);
 
                return string.Join(sep, args);
            }
            if (destinationType == typeof(InstanceDescriptor) && value is SizeF) {
                SizeF size = (SizeF)value; 

                ConstructorInfo ctor = typeof(SizeF).GetConstructor(new Type[] {typeof(float), typeof(float)}); 
                if (ctor != null) { 
                    return new InstanceDescriptor(ctor, new object[] {size.Width, size.Height});
                } 
            }

            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.
        /// 
        [SuppressMessage("Microsoft.Performance", "CA1808:AvoidCallsThatBoxValueTypes")]
        public override object CreateInstance(ITypeDescriptorContext context, IDictionary propertyValues) { 
            return new SizeF((float)propertyValues["Width"],
                            (float)propertyValues["Height"]); 
        } 

        ///  
        /// 
        ///      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(SizeF), attributes); 
            return props.Sort(new string[] {"Width", "Height"});
        } 


        /// 
        ///  
        ///      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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