FontFamily.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

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

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

/* 
* font family object (sdkinc\GDIplusFontFamily.h) 
*/
 
namespace System.Drawing {
    using System.Text;
    using System.Runtime.InteropServices;
    using System.Diagnostics; 
    using System;
    using System.ComponentModel; 
    using Microsoft.Win32; 
    using System.Globalization;
    using System.Drawing.Text; 
    using System.Drawing;
    using System.Drawing.Internal;
    using System.Runtime.Versioning;
 
    /**
     * Represent a FontFamily object 
     */ 
    /// 
    ///  
    ///    Abstracts a group of type faces having a
    ///    similar basic design but having certain variation in styles.
    /// 
    public sealed class FontFamily : MarshalByRefObject, IDisposable { 
        private const int LANG_NEUTRAL = 0;
        private IntPtr nativeFamily; 
        private bool createDefaultOnFail; 

#if DEBUG 
        private static object lockObj = new object();
        private static int idCount = 0;
        private int id;
#endif 

        ///  
        ///     Sets the GDI+ native family. 
        /// 
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2106:SecureAsserts")] 
        private void SetNativeFamily( IntPtr family )
        {
            Debug.Assert( this.nativeFamily == IntPtr.Zero, "Setting GDI+ native font family when already initialized." );
            Debug.Assert( family != IntPtr.Zero, "Setting GDI+ native font family to null." ); 

            this.nativeFamily = family; 
#if DEBUG 
            lock(lockObj){
                id = ++idCount; 
            }
#endif
        }
 
        ///
        ///     Internal constructor to initialize the native GDI+ font to an existing one. 
        ///     Used to create generic fonts and by FontCollection class. 
        ///
        internal FontFamily(IntPtr family) 
        {
            SetNativeFamily( family );
        }
 
        /// 
        ///  
        ///     
        ///       Initializes a new instance of the 
        ///       class with the specified name. 
        ///
        ///       The  parameter determines how errors are
        ///       handled when creating a font based on a font family that does not exist on the
        ///       end user's system at run time. If this parameter is true, then a fall-back font 
        ///       will always be used instead. If this parameter is false, an exception will be thrown.
        ///     
        ///  
        [ResourceExposure(ResourceScope.Process)]
        [ResourceConsumption(ResourceScope.Process)] 
        internal FontFamily(string name, bool createDefaultOnFail)
        {
            this.createDefaultOnFail = createDefaultOnFail;
            CreateFontFamily(name, null); 
        }
 
        ///  
        /// 
        ///     
        ///       Initializes a new instance of the 
        ///       class with the specified name.
        ///    
        ///  
        [ResourceExposure(ResourceScope.Process)]
        [ResourceConsumption(ResourceScope.Process)] 
        public FontFamily(string name) 
        {
            CreateFontFamily(name, null); 
        }

        /// 
        ///  
        ///    Initializes a new instance of the 
        ///    class in the specified  and with the specified name. 
        ///  
        [ResourceExposure(ResourceScope.Process)]
        [ResourceConsumption(ResourceScope.Process)] 
        public FontFamily(string name, FontCollection fontCollection)
        {
            CreateFontFamily(name, fontCollection);
        } 

        ///  
        ///     Creates the native font family object. 
        ///     Note: GDI+ creates singleton font family objects (from the corresponding font file) and reference count them.
        ///  
        [ResourceExposure(ResourceScope.Process)]
        [ResourceConsumption(ResourceScope.Process)]
        private void CreateFontFamily(string name, FontCollection fontCollection)
        { 
            IntPtr fontfamily = IntPtr.Zero;
            IntPtr nativeFontCollection = (fontCollection == null) ? IntPtr.Zero : fontCollection.nativeFontCollection; 
 
            int status = SafeNativeMethods.Gdip.GdipCreateFontFamilyFromName(name, new HandleRef(fontCollection, nativeFontCollection), out fontfamily);
 
            if (status != SafeNativeMethods.Gdip.Ok)
            {
                if (createDefaultOnFail)
                { 
                    fontfamily = GetGdipGenericSansSerif();  // This throws if failed.
                } 
                else 
                {
                    // Special case this incredibly common error message to give more information 
                    if (status == SafeNativeMethods.Gdip.FontFamilyNotFound)
                    {
                        throw new ArgumentException(SR.GetString(SR.GdiplusFontFamilyNotFound, name));
                    } 
                    else if (status == SafeNativeMethods.Gdip.NotTrueTypeFont)
                    { 
                        throw new ArgumentException(SR.GetString(SR.GdiplusNotTrueTypeFont, name)); 
                    }
                    else 
                    {
                        throw SafeNativeMethods.Gdip.StatusException(status);
                    }
                } 
            }
 
            SetNativeFamily( fontfamily ); 
        }
 
        /// 
        /// 
        ///    Initializes a new instance of the 
        ///    class from the specified generic font family. 
        /// 
        [ResourceExposure(ResourceScope.Process)] 
        [ResourceConsumption(ResourceScope.Process)] 
        public FontFamily(GenericFontFamilies genericFamily) {
            IntPtr fontfamily = IntPtr.Zero; 
            int status;

            switch (genericFamily) {
                case GenericFontFamilies.Serif: 
                {
                    status = SafeNativeMethods.Gdip.GdipGetGenericFontFamilySerif(out fontfamily); 
                    break; 
                }
                case GenericFontFamilies.SansSerif: 
                {
                    status = SafeNativeMethods.Gdip.GdipGetGenericFontFamilySansSerif(out fontfamily);
                    break;
                } 
                case GenericFontFamilies.Monospace:
                default: 
                { 
                    status = SafeNativeMethods.Gdip.GdipGetGenericFontFamilyMonospace(out fontfamily);
                    break; 
                }
            }

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            SetNativeFamily( fontfamily ); 
        }
 
        /// 
        /// 
        ///    
        ///       Allows an object to free resources before the object is reclaimed by the 
        ///       Garbage Collector ().
        ///     
        ///  
        ~FontFamily()
        { 
            Dispose(false);
        }

        ///  
        ///     The GDI+ native font family.  It is shared by all FontFamily objects with same family name.
        ///  
        internal IntPtr NativeFamily 
        {
            [System.Runtime.TargetedPatchingOptOutAttribute("Performance critical to inline across NGen image boundaries")] 
            get
            {
                //Debug.Assert( this.nativeFamily != IntPtr.Zero, "this.nativeFamily == IntPtr.Zero." );
                return this.nativeFamily; 
            }
        } 
 
        // The managed wrappers do not expose a Clone method, as it's really nothing more
        // than AddRef (it doesn't copy the underlying GpFont), and in a garbage collected 
        // world, that's not very useful.

        /// 
        ///  
        ///    [To be supplied.]
        ///  
        public override bool Equals(object obj) 
        {
 
            if (obj == this)
                return true;

            FontFamily ff = obj as FontFamily; 

            if (ff == null) 
                return false; 

            // We can safely use the ptr to the native GDI+ FontFamily because it is common to 
            // all objects of the same family (singleton RO object).
            return ff.NativeFamily == this.NativeFamily;
        }
 
        /// 
        ///  
        ///    Converts this  to a 
        ///    human-readable string.
        ///  
        public override string ToString() {
            return string.Format(CultureInfo.CurrentCulture, "[{0}: Name={1}]", GetType().Name, this.Name);
        }
 
        /// 
        ///  
        ///    Gets a hash code for this . 
        /// 
        public override int GetHashCode() { 
            return this.GetName(LANG_NEUTRAL).GetHashCode();
        }

        private static int CurrentLanguage { 
            get {
                return System.Globalization.CultureInfo.CurrentUICulture.LCID; 
            } 
        }
 
        /// 
        /// 
        ///    Disposes of this .
        ///  
        public void Dispose() {
            Dispose(true); 
            GC.SuppressFinalize(this); 
        }
 
        void Dispose(bool disposing)
        {
            if (this.nativeFamily != IntPtr.Zero)
            { 
                try
                { 
#if DEBUG 
                    int status =
#endif 
                    SafeNativeMethods.Gdip.GdipDeleteFontFamily(new HandleRef(this, this.nativeFamily));
#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 
                { 
                    this.nativeFamily = IntPtr.Zero;
                } 
            }
        }

        ///  
        /// 
        ///    Gets the name of this . 
        ///  
        public String Name
        { 
            get
            {
                return GetName(CurrentLanguage);
            } 
        }
 
        ///  
        /// 
        ///     
        ///       Retuns the name of this  in
        ///       the specified language.
        ///    
        ///  
        public String GetName(int language)
        { 
            // LF_FACESIZE is 32 
            StringBuilder name = new StringBuilder(32);
 
            int status = SafeNativeMethods.Gdip.GdipGetFamilyName(new HandleRef(this, this.NativeFamily), name, language);

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

            return name.ToString(); 
        } 

 
        /// 
        /// 
        ///    Returns an array that contains all of the
        ///  objects associated with the current graphics 
        ///    context.
        ///  
        public static FontFamily[] Families { 
            [ResourceExposure(ResourceScope.None)]
            [ResourceConsumption(ResourceScope.Process, ResourceScope.Process)] 
            get {
                return new InstalledFontCollection().Families;
            }
        } 

         ///  
        ///  
        ///    
        ///       Gets a generic SansSerif . 
        ///    
        /// 
        public static FontFamily GenericSansSerif {
            [ResourceExposure(ResourceScope.Process)] 
            [ResourceConsumption(ResourceScope.Process)]
            get { 
                return new FontFamily(GetGdipGenericSansSerif()); 
            }
        } 

        [ResourceExposure(ResourceScope.Process)]
        [ResourceConsumption(ResourceScope.Process)]
        private static IntPtr GetGdipGenericSansSerif() { 
            IntPtr fontfamily = IntPtr.Zero;
 
            int status = SafeNativeMethods.Gdip.GdipGetGenericFontFamilySansSerif(out fontfamily); 

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

            return fontfamily;
        } 

        ///  
        ///  
        ///    Gets a generic Serif .
        ///  
        public static FontFamily GenericSerif {
            [ResourceExposure(ResourceScope.Process)]
            [ResourceConsumption(ResourceScope.Process)]
            get { 
                return new FontFamily(GetNativeGenericSerif());
            } 
        } 

        [ResourceExposure(ResourceScope.Process)] 
        [ResourceConsumption(ResourceScope.Process)]
        private static IntPtr GetNativeGenericSerif() {
            IntPtr fontfamily = IntPtr.Zero;
 
            int status = SafeNativeMethods.Gdip.GdipGetGenericFontFamilySerif(out fontfamily);
 
            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            return fontfamily;
        }

        ///  
        /// 
        ///    Gets a generic monospace . 
        ///  
        public static FontFamily GenericMonospace {
            [ResourceExposure(ResourceScope.Process)] 
            [ResourceConsumption(ResourceScope.Process)]
            get {
                return new FontFamily(GetNativeGenericMonospace());
            } 
        }
 
        [ResourceExposure(ResourceScope.Process)] 
        [ResourceConsumption(ResourceScope.Process)]
        private static IntPtr GetNativeGenericMonospace() { 
            IntPtr fontfamily = IntPtr.Zero;

            int status = SafeNativeMethods.Gdip.GdipGetGenericFontFamilyMonospace(out fontfamily);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
 
            return fontfamily;
        } 

        // No longer support in FontFamily
        // Obsolete API and need to be removed later
        // 
        /// 
        ///  
        ///     
        ///       Returns an array that contains all of the  objects associated with
        ///       the specified graphics context. 
        ///    
        /// 
        [ResourceExposure(ResourceScope.Process)]
        [ResourceConsumption(ResourceScope.Process)] 
        [Obsolete("Do not use method GetFamilies, use property Families instead")]
        public static FontFamily[] GetFamilies(Graphics graphics) { 
            if (graphics == null) 
                throw new ArgumentNullException("graphics");
 
            return new InstalledFontCollection().Families;
        }

        ///  
        /// 
        ///    Indicates whether the specified  is 
        ///    available. 
        /// 
        public bool IsStyleAvailable(FontStyle style) { 
            int bresult;

            int status = SafeNativeMethods.Gdip.GdipIsStyleAvailable(new HandleRef(this, this.NativeFamily), style, out bresult);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
 
            return bresult != 0;
        } 

        /// 
        /// 
        ///    Gets the size of the Em square for the 
        ///    specified style in font design units.
        ///  
        public int GetEmHeight(FontStyle style) { 
            int result = 0;
 
            int status = SafeNativeMethods.Gdip.GdipGetEmHeight(new HandleRef(this, this.NativeFamily), style, out result);

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

            return result; 
        } 

 
        /// 
        /// 
        ///    
        ///       Returns the ascender metric for Windows. 
        ///    
        ///  
        public int GetCellAscent(FontStyle style) { 
            int result = 0;
 
            int status = SafeNativeMethods.Gdip.GdipGetCellAscent(new HandleRef(this, this.NativeFamily), style, out result);

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

            return result; 
        } 

        ///  
        /// 
        ///    
        ///       Returns the descender metric for Windows.
        ///     
        /// 
        public int GetCellDescent(FontStyle style) { 
            int result = 0; 

            int status = SafeNativeMethods.Gdip.GdipGetCellDescent(new HandleRef(this, this.NativeFamily), style, out result); 

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            return result;
        } 
 
        /// 
        ///  
        ///    Returns the distance between two
        ///    consecutive lines of text for this  with the specified .
        /// 
        public int GetLineSpacing(FontStyle style) { 
            int result = 0;
 
            int status = SafeNativeMethods.Gdip.GdipGetLineSpacing(new HandleRef(this, this.NativeFamily), style, out result); 

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

            return result;
        } 
    }
} 

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

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