SolidBrush.cs source code in C# .NET

                        Code:
                         / Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / fx / src / CommonUI / System / Drawing / SolidBrush.cs / 2 / 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;
 
    /// 
    ///  
    ///     
    ///       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.
// 
//----------------------------------------------------------------------------- 

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.
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SolidBrush.cs source code in C# .NET

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