StringFormat.cs source code in C# .NET

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Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CommonUI / System / Drawing / Advanced / StringFormat.cs / 1305376 / StringFormat.cs

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

namespace System.Drawing { 
    using System.Diagnostics; 
    using System;
    using Microsoft.Win32; 
    using System.Drawing;
    using System.ComponentModel;
    using System.Drawing.Text;
    using System.Drawing.Internal; 
    using System.Runtime.InteropServices;
    using System.Globalization; 
    using System.Runtime.Versioning; 

    ///  
    [StructLayout(LayoutKind.Sequential)]
    public struct CharacterRange {

        private int first; 
        private int length;
 
         /** 
         * Create a new CharacterRange object
         */ 
        /// 
        /// 
        ///    
        ///       Initializes a new instance of the  class 
        ///       with the specified coordinates.
        ///     
        ///  
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly")]
        public CharacterRange(int First, int Length) { 
            this.first = First;
            this.length = Length;
        }
 
        /// 
        ///  
        ///    Gets the First character position of this . 
        /// 
        public int First { 
            get {
                return first;
            }
            set { 
                first = value;
            } 
        } 

        ///  
        /// 
        ///    
        ///       Gets the Length of this .
        ///     
        /// 
        public int Length { 
            get { 
                return length;
            } 
            set {
                length = value;
            }
        } 

        public override bool Equals(object obj) 
        { 
            if (obj.GetType() != typeof(CharacterRange))
                return false; 

            CharacterRange cr = (CharacterRange)obj;
            return ((this.first == cr.First) && (this.length == cr.Length));
        } 

        ///  
        public static bool operator ==(CharacterRange cr1, CharacterRange cr2) 
        {
            return ((cr1.First == cr2.First) && (cr1.Length == cr2.Length)); 
        }

        /// 
        public static bool operator !=(CharacterRange cr1, CharacterRange cr2) 
        {
            return !(cr1 == cr2); 
        } 

        ///  
        public override int GetHashCode()
        {
            return this.first << 8 + this.length;
        } 
    }
 
    /** 
     * Represent a Stringformat object
     */ 
    /// 
    /// 
    ///    Encapsulates text layout information (such
    ///    as alignment and linespacing), display manipulations (such as ellipsis insertion 
    ///    and national digit substitution) and OpenType features.
    ///  
    public sealed class StringFormat : MarshalByRefObject, ICloneable, IDisposable { 
        internal IntPtr nativeFormat;
 
        private StringFormat(IntPtr format) {
            nativeFormat = format;
        }
 
        /// 
        ///  
        ///    Initializes a new instance of the  
        ///    class.
        ///  
        [ResourceExposure(ResourceScope.Process)]
        [ResourceConsumption(ResourceScope.Process)]
        public StringFormat() : this(0, 0) {
        } 

        ///  
        ///  
        ///    Initializes a new instance of the 
        ///    class with the specified . 
        /// 
        [ResourceExposure(ResourceScope.Process)]
        [ResourceConsumption(ResourceScope.Process)]
        public StringFormat(StringFormatFlags options) : 
        this(options, 0) {
        } 
 
        /// 
        ///  
        ///    Initializes a new instance of the 
        ///    class with the specified  and language.
        /// 
        [ResourceExposure(ResourceScope.Process)] 
        [ResourceConsumption(ResourceScope.Process)]
        public StringFormat(StringFormatFlags options, int language) { 
            int status = SafeNativeMethods.Gdip.GdipCreateStringFormat(options, language, out nativeFormat); 

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
        }

        ///  
        /// 
        ///     
        ///       Initializes a new instance of the  class from the specified 
        ///       existing .
        ///     
        /// 
        [ResourceExposure(ResourceScope.Process)]
        [ResourceConsumption(ResourceScope.Process)]
        public StringFormat(StringFormat format) { 

            if (format == null) { 
                throw new ArgumentNullException("format"); 
            }
 
            int status = SafeNativeMethods.Gdip.GdipCloneStringFormat(new HandleRef(format, format.nativeFormat), out nativeFormat);

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        }
 
        ///  
        /// 
        ///    Cleans up Windows resources for this 
        /// .
        /// 
        public void Dispose() {
            Dispose(true); 
            GC.SuppressFinalize(this);
        } 
 
        /// 
        void Dispose(bool disposing) { 
            if (nativeFormat != IntPtr.Zero) {
                try{
#if DEBUG
                    int status = 
#endif
                    SafeNativeMethods.Gdip.GdipDeleteStringFormat(new HandleRef(this, nativeFormat)); 
#if DEBUG 
                    Debug.Assert(status == SafeNativeMethods.Gdip.Ok, "GDI+ returned an error status: " + status.ToString(CultureInfo.InvariantCulture));
#endif 
                }
                catch( Exception ex ){
                    if( ClientUtils.IsCriticalException( ex ) ) {
                        throw; 
                    }
 
                    Debug.Fail( "Exception thrown during Dispose: " + ex.ToString() ); 
                }
                finally{ 
                    nativeFormat = IntPtr.Zero;
                }
            }
        } 

        ///  
        ///  
        ///    Creates an exact copy of this .
        ///  
        [ResourceExposure(ResourceScope.Process)]
        [ResourceConsumption(ResourceScope.Process)]
        public object Clone() {
            IntPtr cloneFormat = IntPtr.Zero; 

            int status = SafeNativeMethods.Gdip.GdipCloneStringFormat(new HandleRef(this, nativeFormat), out cloneFormat); 
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 

            StringFormat newCloneStringFormat = new StringFormat(cloneFormat);

            return newCloneStringFormat; 
        }
 
 
        /// 
        ///  
        ///    Gets or sets a  that contains formatting information.
        /// 
        public StringFormatFlags FormatFlags {
            get { 
                StringFormatFlags format;
 
                int status = SafeNativeMethods.Gdip.GdipGetStringFormatFlags(new HandleRef(this, nativeFormat), out format); 

                if (status != SafeNativeMethods.Gdip.Ok) 
                    throw SafeNativeMethods.Gdip.StatusException(status);

                return format;
            } 
            set {
                Debug.Assert(nativeFormat != IntPtr.Zero, "NativeFormat is null!"); 
                int status = SafeNativeMethods.Gdip.GdipSetStringFormatFlags(new HandleRef(this, nativeFormat), value); 

                if (status != SafeNativeMethods.Gdip.Ok) 
                    throw SafeNativeMethods.Gdip.StatusException(status);
            }
        }
 
        /// 
        ///  
        ///     
        ///       Sets the measure of characters to the specified
        ///       range. 
        ///    
        /// 
        public void SetMeasurableCharacterRanges(CharacterRange[] ranges) {
 
            int status = SafeNativeMethods.Gdip.GdipSetStringFormatMeasurableCharacterRanges(new HandleRef(this, nativeFormat), ranges.Length, ranges);
 
            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
 
        }

        // For English, this is horizontal alignment
        ///  
        /// 
        ///    Specifies text alignment information. 
        ///  
        public StringAlignment Alignment {
            get { 
                StringAlignment alignment = 0;
                Debug.Assert(nativeFormat != IntPtr.Zero, "NativeFormat is null!");
                int status = SafeNativeMethods.Gdip.GdipGetStringFormatAlign(new HandleRef(this, nativeFormat), out alignment);
 
                if (status != SafeNativeMethods.Gdip.Ok)
                    throw SafeNativeMethods.Gdip.StatusException(status); 
 
                return alignment;
            } 
            set {
                //valid values are 0x0 to 0x2
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)StringAlignment.Near, (int)StringAlignment.Far))
                { 
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(StringAlignment));
                } 
 
                Debug.Assert(nativeFormat != IntPtr.Zero, "NativeFormat is null!");
                int status = SafeNativeMethods.Gdip.GdipSetStringFormatAlign(new HandleRef(this, nativeFormat), value); 

                if (status != SafeNativeMethods.Gdip.Ok)
                    throw SafeNativeMethods.Gdip.StatusException(status);
            } 
        }
 
        // For English, this is vertical alignment 
        /// 
        ///  
        ///    Gets or sets the line alignment.
        /// 
        public StringAlignment LineAlignment {
            get { 
                StringAlignment alignment = 0;
                Debug.Assert(nativeFormat != IntPtr.Zero, "NativeFormat is null!"); 
                int status = SafeNativeMethods.Gdip.GdipGetStringFormatLineAlign(new HandleRef(this, nativeFormat), out alignment); 

                if (status != SafeNativeMethods.Gdip.Ok) 
                    throw SafeNativeMethods.Gdip.StatusException(status);

                return alignment;
            } 
            set {
                if (value<0 || value>StringAlignment.Far) { 
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(StringAlignment)); 
                }
 
                Debug.Assert(nativeFormat != IntPtr.Zero, "NativeFormat is null!");
                int status = SafeNativeMethods.Gdip.GdipSetStringFormatLineAlign(new HandleRef(this, nativeFormat), value);

                if (status != SafeNativeMethods.Gdip.Ok) 
                    throw SafeNativeMethods.Gdip.StatusException(status);
            } 
        } 

        ///  
        /// 
        ///    
        ///       Gets or sets the  for this  .
        ///     
        /// 
        public HotkeyPrefix HotkeyPrefix { 
            get { 
                HotkeyPrefix hotkeyPrefix;
                Debug.Assert(nativeFormat != IntPtr.Zero, "NativeFormat is null!"); 
                int status = SafeNativeMethods.Gdip.GdipGetStringFormatHotkeyPrefix(new HandleRef(this, nativeFormat), out hotkeyPrefix);

                if (status != SafeNativeMethods.Gdip.Ok)
                    throw SafeNativeMethods.Gdip.StatusException(status); 

                return hotkeyPrefix; 
            } 
            set {
                //valid values are 0x0 to 0x2 
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)HotkeyPrefix.None, (int)HotkeyPrefix.Hide))
                {
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(HotkeyPrefix));
                } 

                Debug.Assert(nativeFormat != IntPtr.Zero, "NativeFormat is null!"); 
                int status = SafeNativeMethods.Gdip.GdipSetStringFormatHotkeyPrefix(new HandleRef(this, nativeFormat), value); 

                if (status != SafeNativeMethods.Gdip.Ok) 
                    throw SafeNativeMethods.Gdip.StatusException(status);
            }
        }
 
        /// 
        ///  
        ///    Sets tab stops for this . 
        /// 
        public void SetTabStops(float firstTabOffset, float[] tabStops) { 
            if (firstTabOffset < 0)
                throw new ArgumentException(SR.GetString(SR.InvalidArgument, "firstTabOffset", firstTabOffset));

            int status = SafeNativeMethods.Gdip.GdipSetStringFormatTabStops(new HandleRef(this, nativeFormat), firstTabOffset, tabStops.Length, tabStops); 

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status); 
        }
 
        /// 
        /// 
        ///    Gets the tab stops for this .
        ///  
        public float [] GetTabStops(out float firstTabOffset) {
 
            int count = 0; 
            int status = SafeNativeMethods.Gdip.GdipGetStringFormatTabStopCount(new HandleRef(this, nativeFormat), out count);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);

            float[] tabStops = new float[count]; 
            status = SafeNativeMethods.Gdip.GdipGetStringFormatTabStops(new HandleRef(this, nativeFormat), count, out firstTabOffset, tabStops);
 
            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            return tabStops;
        }

 
        // String trimming. How to handle more text than can be displayed
        // in the limits available. 
 
        /// 
        ///  
        ///    Gets or sets the 
        ///    for this .
        /// 
        public StringTrimming Trimming { 
            get {
                StringTrimming trimming; 
                int status = SafeNativeMethods.Gdip.GdipGetStringFormatTrimming(new HandleRef(this, nativeFormat), out trimming); 

                if (status != SafeNativeMethods.Gdip.Ok) 
                    throw SafeNativeMethods.Gdip.StatusException(status);
                return trimming;
            }
 
            set {
                //valid values are 0x0 to 0x5 
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)StringTrimming.None, (int)StringTrimming.EllipsisPath)) 
                {
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(StringTrimming)); 
                }

                int status = SafeNativeMethods.Gdip.GdipSetStringFormatTrimming(new HandleRef(this, nativeFormat), value);
 
                if (status != SafeNativeMethods.Gdip.Ok)
                    throw SafeNativeMethods.Gdip.StatusException(status); 
            } 
        }
 
        /// 
        /// 
        ///    Gets a generic default .
        ///    Remarks from MSDN: A generic, default StringFormat object has the following characteristics: 
        ///         - No string format flags are set.
        ///         - Character alignment and line alignment are set to StringAlignmentNear. 
        ///         - Language ID is set to neutral language, which means that the current language associated with the calling thread is used. 
        ///         - String digit substitution is set to StringDigitSubstituteUser.
        ///         - Hot key prefix is set to HotkeyPrefixNone. 
        ///         - Number of tab stops is set to zero.
        ///         - String trimming is set to StringTrimmingCharacter.
        /// 
        public static StringFormat GenericDefault { 
            [ResourceExposure(ResourceScope.Process)]
            [ResourceConsumption(ResourceScope.Process)] 
            get { 
                IntPtr format;
                int status = SafeNativeMethods.Gdip.GdipStringFormatGetGenericDefault(out format); 

                if (status != SafeNativeMethods.Gdip.Ok)
                    throw SafeNativeMethods.Gdip.StatusException(status);
 
                return new StringFormat(format);
            } 
        } 

        ///  
        /// 
        ///    Gets a generic typographic .
        ///    Remarks from MSDN: A generic, typographic StringFormat object has the following characteristics:
        ///         - String format flags StringFormatFlagsLineLimit, StringFormatFlagsNoClip, and StringFormatFlagsNoFitBlackBox are set. 
        ///         - Character alignment and line alignment are set to StringAlignmentNear.
        ///         - Language ID is set to neutral language, which means that the current language associated with the calling thread is used. 
        ///         - String digit substitution is set to StringDigitSubstituteUser. 
        ///         - Hot key prefix is set to HotkeyPrefixNone.
        ///         - Number of tab stops is set to zero. 
        ///         - String trimming is set to StringTrimmingNone.
        /// 
        public static StringFormat GenericTypographic {
            [ResourceExposure(ResourceScope.Process)] 
            [ResourceConsumption(ResourceScope.Process)]
            get { 
                IntPtr format; 
                int status = SafeNativeMethods.Gdip.GdipStringFormatGetGenericTypographic(out format);
 
                if (status != SafeNativeMethods.Gdip.Ok)
                    throw SafeNativeMethods.Gdip.StatusException(status);

                return new StringFormat(format); 
            }
        } 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public void SetDigitSubstitution(int language, StringDigitSubstitute substitute)
        { 
            int status = SafeNativeMethods.Gdip.GdipSetStringFormatDigitSubstitution(new HandleRef(this, nativeFormat), language, substitute);
 
            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
        } 

        /// 
        /// 
        ///    Gets the  
        ///    for this .
        ///  
        public StringDigitSubstitute DigitSubstitutionMethod { 
            get {
                StringDigitSubstitute digitSubstitute; 
                int lang = 0;

                int status = SafeNativeMethods.Gdip.GdipGetStringFormatDigitSubstitution(new HandleRef(this, nativeFormat), out lang, out digitSubstitute);
 
                if (status != SafeNativeMethods.Gdip.Ok)
                    throw SafeNativeMethods.Gdip.StatusException(status); 
 
                return digitSubstitute;
            } 
        }

        /// 
        ///  
        ///    Gets the language of 
        ///    for this . 
        ///  
        public int DigitSubstitutionLanguage {
            get { 
                StringDigitSubstitute digitSubstitute;
                int language = 0;
                int status = SafeNativeMethods.Gdip.GdipGetStringFormatDigitSubstitution(new HandleRef(this, nativeFormat), out language, out digitSubstitute);
 
                if (status != SafeNativeMethods.Gdip.Ok)
                    throw SafeNativeMethods.Gdip.StatusException(status); 
 
                return language;
            } 
        }

        /**
          * Object cleanup 
          */
        ///  
        ///  
        ///    Cleans up Windows resources for this
        /// . 
        /// 
        ~StringFormat() {
            Dispose(false);
        } 

        ///  
        ///  
        ///    Converts this  to
        ///    a human-readable string. 
        /// 
        public override string ToString() {
            return "[StringFormat, FormatFlags=" + FormatFlags.ToString() + "]";
        } 

 
    } 
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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