SystemBrushes.cs source code in C# .NET

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

/* 
 */ 
namespace System.Drawing {
 
    using System.Diagnostics;
    using System;

    ///  
    /// 
    ///     Brushes for select Windows system-wide colors.  Whenever possible, try to use 
    ///     SystemPens and SystemBrushes rather than SystemColors. 
    /// 
    public sealed class SystemBrushes { 
        static readonly object SystemBrushesKey = new object();

        private SystemBrushes() {
        } 

        ///  
        ///  
        ///     Brush is the color of the active window border.
        ///  
        public static Brush ActiveBorder {
            get {
                return FromSystemColor(SystemColors.ActiveBorder);
            } 
        }
 
        ///  
        /// 
        ///     Brush is the color of the active caption bar. 
        /// 
        public static Brush ActiveCaption {
            get {
                return FromSystemColor(SystemColors.ActiveCaption); 
            }
        } 
 
        /// 
        ///  
        ///     Brush is the color of the active caption bar.
        /// 
        public static Brush ActiveCaptionText {
            get { 
                return FromSystemColor(SystemColors.ActiveCaptionText);
            } 
        } 

        ///  
        /// 
        ///     Brush is the color of the app workspace window.
        /// 
        public static Brush AppWorkspace { 
            get {
                return FromSystemColor(SystemColors.AppWorkspace); 
            } 
        }
 
        /// 
        /// 
        ///     Brush for the ButtonFace system color.
        ///  
        public static Brush ButtonFace {
            get { 
                return FromSystemColor(SystemColors.ButtonFace); 
            }
        } 

        /// 
        /// 
        ///     Brush for the ButtonHighlight system color. 
        /// 
        public static Brush ButtonHighlight { 
            get { 
                return FromSystemColor(SystemColors.ButtonHighlight);
            } 
        }

        /// 
        ///  
        ///     Brush for the ButtonShadow system color.
        ///  
        public static Brush ButtonShadow { 
            get {
                return FromSystemColor(SystemColors.ButtonShadow); 
            }
        }

        ///  
        /// 
        ///     Brush is the control color, which is the surface color for 3D elements. 
        ///  
        public static Brush Control {
            get { 
                return FromSystemColor(SystemColors.Control);
            }
        }
 
        /// 
        ///  
        ///     Brush is the lighest part of a 3D element. 
        /// 
        public static Brush ControlLightLight { 
            get {
                return FromSystemColor(SystemColors.ControlLightLight);
            }
        } 

        ///  
        ///  
        ///     Brush is the highlight part of a 3D element.
        ///  
        public static Brush ControlLight {
            get {
                return FromSystemColor(SystemColors.ControlLight);
            } 
        }
 
        ///  
        /// 
        ///     Brush is the shadow part of a 3D element. 
        /// 
        public static Brush ControlDark {
            get {
                return FromSystemColor(SystemColors.ControlDark); 
            }
        } 
 
        /// 
        ///  
        ///     Brush is the darkest part of a 3D element.
        /// 
        public static Brush ControlDarkDark {
            get { 
                return FromSystemColor(SystemColors.ControlDarkDark);
            } 
        } 

        ///  
        /// 
        ///     Brush is the color of text on controls.
        /// 
        public static Brush ControlText { 
            get {
                return FromSystemColor(SystemColors.ControlText); 
            } 
        }
 
        /// 
        /// 
        ///     Brush is the color of the desktop.
        ///  
        public static Brush Desktop
        { 
            get 
            {
                return FromSystemColor(SystemColors.Desktop); 
            }
        }

        ///  
        /// 
        ///     Brush for the GradientActiveCaption system color. 
        ///  
        public static Brush GradientActiveCaption {
            get { 
                return FromSystemColor(SystemColors.GradientActiveCaption);
            }
        }
 
        /// 
        ///  
        ///     Brush for the GradientInactiveCaption system color. 
        /// 
        public static Brush GradientInactiveCaption { 
            get {
                return FromSystemColor(SystemColors.GradientInactiveCaption);
            }
        } 

        ///  
        ///  
        ///     Brush for the GrayText system color.
        ///  
        public static Brush GrayText {
            get {
                return FromSystemColor(SystemColors.GrayText);
            } 
        }
 
        ///  
        /// 
        ///     Brush is the color of the background of highlighted elements. 
        /// 
        public static Brush Highlight {
            get {
                return FromSystemColor(SystemColors.Highlight); 
            }
        } 
 
        /// 
        ///  
        ///     Brush is the color of the foreground of highlighted elements.
        /// 
        public static Brush HighlightText {
            get { 
                return FromSystemColor(SystemColors.HighlightText);
            } 
        } 

        ///  
        /// 
        ///     Brush is the color used to represent hot tracking.
        /// 
        public static Brush HotTrack { 
            get {
                return FromSystemColor(SystemColors.HotTrack); 
            } 
        }
 
        /// 
        /// 
        ///     Brush is the color of an inactive caption bar.
        ///  
        public static Brush InactiveCaption {
            get { 
                return FromSystemColor(SystemColors.InactiveCaption); 
            }
        } 

        /// 
        /// 
        ///     Brush is the color if an inactive window border. 
        /// 
        public static Brush InactiveBorder { 
            get { 
                return FromSystemColor(SystemColors.InactiveBorder);
            } 
        }

        /// 
        ///  
        ///     Brush is the color of an inactive caption text.
        ///  
        public static Brush InactiveCaptionText { 
            get {
                return FromSystemColor(SystemColors.InactiveCaptionText); 
            }
        }

        ///  
        /// 
        ///     Brush is the color of the background of the info tooltip. 
        ///  
        public static Brush Info {
            get { 
                return FromSystemColor(SystemColors.Info);
            }
        }
 
        /// 
        ///  
        ///     Brush is the color of the info tooltip's text. 
        /// 
        public static Brush InfoText { 
            get {
                return FromSystemColor(SystemColors.InfoText);
            }
        } 

        ///  
        ///  
        ///     Brush is the color of the menu background.
        ///  
        public static Brush Menu {
            get {
                return FromSystemColor(SystemColors.Menu);
            } 
        }
 
        ///  
        /// 
        ///     Brush is the color of the menu background. 
        /// 
        public static Brush MenuBar {
            get {
                return FromSystemColor(SystemColors.MenuBar); 
            }
        } 
 
        /// 
        ///  
        ///     Brush for the MenuHighlight system color.
        /// 
        public static Brush MenuHighlight {
            get { 
                return FromSystemColor(SystemColors.MenuHighlight);
            } 
        } 

        ///  
        /// 
        ///     Brush is the color of the menu text.
        /// 
        public static Brush MenuText { 
            get {
                return FromSystemColor(SystemColors.MenuText); 
            } 
        }
 
        /// 
        /// 
        ///     Brush is the color of the scroll bar area that is not being used by the
        ///     thumb button. 
        /// 
        public static Brush ScrollBar { 
            get { 
                return FromSystemColor(SystemColors.ScrollBar);
            } 
        }

        /// 
        ///  
        ///     Brush is the color of the window background.
        ///  
        public static Brush Window { 
            get {
                return FromSystemColor(SystemColors.Window); 
            }
        }

        ///  
        /// 
        ///     Brush is the color of the thin frame drawn around a window. 
        ///  
        public static Brush WindowFrame {
            get { 
                return FromSystemColor(SystemColors.WindowFrame);
            }
        }
 
        /// 
        ///  
        ///     Brush is the color of text on controls. 
        /// 
        public static Brush WindowText { 
            get {
                return FromSystemColor(SystemColors.WindowText);
            }
        } 

        ///  
        ///  
        ///     Retrieves a brush given a system color.  An error will be raised
        ///     if the color provide is not a system color. 
        /// 
        public static Brush FromSystemColor(Color c) {
            if (!c.IsSystemColor) {
                throw new ArgumentException(SR.GetString(SR.ColorNotSystemColor, c.ToString())); 
            }
 
            Brush[] systemBrushes = (Brush[])SafeNativeMethods.Gdip.ThreadData[SystemBrushesKey]; 
            if (systemBrushes == null) {
                systemBrushes = new Brush[(int)KnownColor.WindowText + (int)KnownColor.MenuHighlight - (int)KnownColor.YellowGreen]; 
                SafeNativeMethods.Gdip.ThreadData[SystemBrushesKey] = systemBrushes;
            }
            int idx = (int)c.ToKnownColor();
            if (idx > (int)KnownColor.YellowGreen) { 
                idx -= (int)KnownColor.YellowGreen - (int)KnownColor.WindowText;
            } 
            idx--; 

            Debug.Assert(idx >= 0 && idx < systemBrushes.Length, "System colors have been added but our system color array has not been expanded."); 

            if (systemBrushes[idx] == null) {
                systemBrushes[idx] = new SolidBrush(c, true);
            } 

            return systemBrushes[idx]; 
        } 
    }
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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