SolidBrush.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CommonUI / System / Drawing / SolidBrush.cs / 1305376 / SolidBrush.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

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

    ///  
    ///  
    ///    
    ///       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. 
        ///    
        ///  
        [ResourceExposure(ResourceScope.Process)]
        [ResourceConsumption(ResourceScope.Process)]
        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);

            SetNativeBrushInternal(brush); 

            if (color.IsSystemColor) 
                SystemColorTracker.Add(this); 
        }
 
        [ResourceExposure(ResourceScope.Process)]
        [ResourceConsumption(ResourceScope.Process)]
        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." );
            SetNativeBrushInternal( nativeBrush ); 
        }
 
        ///  
        /// 
        ///    Creates an exact copy of this . 
        /// 
        [ResourceExposure(ResourceScope.Process)]
        [ResourceConsumption(ResourceScope.Process)]
        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.
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SolidBrush.cs source code in C# .NET

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