SolidBrush.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CommonUI / System / Drawing / SolidBrush.cs / 1 / SolidBrush.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/*************************************************************************\ 
* 
* Copyright (c) 1998-1999, Microsoft Corp.  All Rights Reserved.
* 
* Module Name:
*
*   SolidBrush.cs
* 
* Abstract:
* 
*   COM+ wrapper for GDI+ SolidBrush objects 
*
* Revision History: 
*
*   12/15/1998 [....]
*       Created it.
* 
\**************************************************************************/
 
namespace System.Drawing { 
    using System.Runtime.InteropServices;
    using System.Diagnostics; 
    using System;
    using Microsoft.Win32;
    using System.ComponentModel;
    using System.Drawing.Internal; 

    ///  
    ///  
    ///    
    ///       Defines a brush made up of a single color. Brushes are 
    ///       used to fill graphics shapes such as rectangles, ellipses, pies, polygons, and paths.
    ///    
    /// 
    public sealed class SolidBrush : Brush, ISystemColorTracker { 
        // GDI+ doesn't understand system colors, so we need to cache the value here
        private Color color = Color.Empty; 
        private bool immutable; 

        /** 
         * Create a new solid fill brush object
         */
        /// 
        ///  
        ///    
        ///       Initializes a new instance of the  class of the specified 
        ///       color. 
        ///    
        ///  
        public SolidBrush(Color color)
        {
            this.color = color;
 
            IntPtr brush = IntPtr.Zero;
            int status = SafeNativeMethods.Gdip.GdipCreateSolidFill(this.color.ToArgb(), out brush); 
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 

            SetNativeBrush(brush);

            if (color.IsSystemColor) 
                SystemColorTracker.Add(this);
        } 
 
        internal SolidBrush(Color color, bool immutable) : this(color) {
            this.immutable = immutable; 
        }

        /// 
        ///     Constructor to initialized this object from a GDI+ Brush native pointer. 
        /// 
        internal SolidBrush( IntPtr nativeBrush ) 
        { 
            Debug.Assert( nativeBrush != IntPtr.Zero, "Initializing native brush with null." );
            SetNativeBrush( nativeBrush ); 
        }

        /// 
        ///  
        ///    Creates an exact copy of this .
        ///  
        public override object Clone() 
        {
            IntPtr cloneBrush = IntPtr.Zero; 

            int status = SafeNativeMethods.Gdip.GdipCloneBrush(new HandleRef(this, this.NativeBrush), out cloneBrush);

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            // We intentionally lose the "immutable" bit. 

            return new SolidBrush(cloneBrush); 
        }


        ///  
        protected override void Dispose(bool disposing) {
            if (!disposing) { 
                immutable = false; 
            }
            else if (immutable) { 
                throw new ArgumentException(SR.GetString(SR.CantChangeImmutableObjects, "Brush"));
            }

            base.Dispose(disposing); 
        }
 
        ///  
        /// 
        ///     
        ///       The color of this .
        ///    
        /// 
        public Color Color { 
            get
            { 
                if (this.color == Color.Empty) 
                {
                    int colorARGB = 0; 
                    int status = SafeNativeMethods.Gdip.GdipGetSolidFillColor(new HandleRef(this, this.NativeBrush), out colorARGB);

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

                    this.color = Color.FromArgb(colorARGB); 
                } 

                // GDI+ doesn't understand system colors, so we can't use GdipGetSolidFillColor in the general case 
                return this.color;
            }

            set 
            {
                if (immutable) 
                { 
                    throw new ArgumentException(SR.GetString(SR.CantChangeImmutableObjects, "Brush"));
                } 

                if( this.color != value )
                {
                    Color oldColor = this.color; 
                    InternalSetColor(value);
 
                    // 

                    if (value.IsSystemColor && !oldColor.IsSystemColor) 
                    {
                        SystemColorTracker.Add(this);
                    }
                } 
            }
        } 
 
        // Sets the color even if the brush is considered immutable
        private void InternalSetColor(Color value) { 
            int status = SafeNativeMethods.Gdip.GdipSetSolidFillColor(new HandleRef(this, this.NativeBrush), value.ToArgb());

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

            this.color = value; 
        } 

        ///  
        /// 
        void ISystemColorTracker.OnSystemColorChanged() {
            if( this.NativeBrush != IntPtr.Zero ){
                InternalSetColor(color); 
            }
        } 
    } 
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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SolidBrush.cs source code in C# .NET

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