ColorDialog.cs source code in C# .NET

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

/* 
 */ 
namespace System.Windows.Forms {
    using System.Runtime.InteropServices; 
    using System.Runtime.Versioning;
    using System.Diagnostics;
    using System.Diagnostics.CodeAnalysis;
 
    using System;
    using System.Drawing; 
 
    using System.ComponentModel;
    using System.Windows.Forms; 

    using Microsoft.Win32;
    using System.Security;
    using System.Security.Permissions; 

    ///  
    ///  
    ///    
    ///       Represents a common dialog box that displays available colors along with 
    ///       controls that allow the user to define custom colors.
    ///    
    /// 
    [DefaultProperty("Color")] 
    [SRDescription(SR.DescriptionColorDialog)]
    // The only event this dialog has is HelpRequest, which isn't very useful 
    public class ColorDialog : CommonDialog { 

        private int options; 
        private int[] customColors;

        /// 
        ///  
        /// 
        ///  
        private Color color; 

        ///  
        /// 
        ///    
        ///       Initializes a new instance of the 
        ///       class. 
        ///    
        ///  
        [ 
            SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")  // If the constructor does not call Reset
                                                                                                    // it would be a breaking change. 
        ]
        public ColorDialog() {
            customColors = new int[16];
            Reset(); 
        }
 
        ///  
        /// 
        ///     
        ///       Gets or sets a value indicating whether the user can use the dialog box
        ///       to define custom colors.
        ///    
        ///  
        [
        SRCategory(SR.CatBehavior), 
        DefaultValue(true), 
        SRDescription(SR.CDallowFullOpenDescr)
        ] 
        public virtual bool AllowFullOpen {
            get {
                return !GetOption(NativeMethods.CC_PREVENTFULLOPEN);
            } 

            set { 
                SetOption(NativeMethods.CC_PREVENTFULLOPEN, !value); 
            }
        } 

        /// 
        /// 
        ///     
        ///       Gets or sets a value indicating whether the dialog box displays all available colors in
        ///       the set of basic colors. 
        ///     
        /// 
        [ 
        SRCategory(SR.CatBehavior),
        DefaultValue(false),
        SRDescription(SR.CDanyColorDescr)
        ] 
        public virtual bool AnyColor {
            get { 
                return GetOption(NativeMethods.CC_ANYCOLOR); 
            }
 
            set {
                SetOption(NativeMethods.CC_ANYCOLOR, value);
            }
        } 

        ///  
        ///  
        ///    
        ///       Gets or sets the color selected by the user. 
        ///    
        /// 
        [
        SRCategory(SR.CatData), 
        SRDescription(SR.CDcolorDescr)
        ] 
        public Color Color { 
            get {
                return color; 
            }
            set {
                if (!value.IsEmpty) {
                    color = value; 
                }
                else { 
                    color = Color.Black; 
                }
            } 
        }

        /// 
        ///  
        ///    
        ///       Gets or sets the set of 
        ///       custom colors shown in the dialog box. 
        ///    
        ///  
        [
        Browsable(false),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        SRDescription(SR.CDcustomColorsDescr) 
        ]
        public int[] CustomColors { 
            get { return(int[]) customColors.Clone();} 
            set {
                int length = value == null? 0: Math.Min(value.Length, 16); 
                if (length > 0) Array.Copy(value, 0, customColors, 0, length);
                for (int i = length; i < 16; i++) customColors[i] = 0x00FFFFFF;
            }
        } 

        ///  
        ///  
        ///    
        ///       Gets or sets a value indicating whether the controls used to create custom 
        ///       colors are visible when the dialog box is opened
        ///    
        /// 
        [ 
        SRCategory(SR.CatAppearance),
        DefaultValue(false), 
        SRDescription(SR.CDfullOpenDescr) 
        ]
        public virtual bool FullOpen { 
            get {
                return GetOption(NativeMethods.CC_FULLOPEN);
            }
 
            set {
                SetOption(NativeMethods.CC_FULLOPEN, value); 
            } 
        }
 
        /// 
        /// 
        /// 
        ///     
        ///       Our HINSTANCE from Windows.
        ///     
        ///  
        protected virtual IntPtr Instance {
            [ 
                SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode),
                SecurityPermission(SecurityAction.InheritanceDemand, Flags=SecurityPermissionFlag.UnmanagedCode)
            ]
            [ResourceExposure(ResourceScope.Process)] 
            [ResourceConsumption(ResourceScope.Process)]
            get { return UnsafeNativeMethods.GetModuleHandle(null);} 
        } 

        ///  
        /// 
        ///    Returns our CHOOSECOLOR options.
        /// 
        ///  
        protected virtual int Options {
            get { 
                return options; 
            }
        } 


        /// 
        ///  
        ///    
        ///       Gets or sets a value indicating whether a Help button appears 
        ///       in the color dialog box. 
        ///    
        ///  
        [
        SRCategory(SR.CatBehavior),
        DefaultValue(false),
        SRDescription(SR.CDshowHelpDescr) 
        ]
        public virtual bool ShowHelp { 
            get { 
                return GetOption(NativeMethods.CC_SHOWHELP);
            } 
            set {
                SetOption(NativeMethods.CC_SHOWHELP, value);
            }
        } 

        ///  
        ///  
        ///    
        ///       Gets 
        ///       or sets a value indicating
        ///       whether the dialog
        ///       box will restrict users to selecting solid colors only.
        ///     
        /// 
        [ 
        SRCategory(SR.CatBehavior), 
        DefaultValue(false),
        SRDescription(SR.CDsolidColorOnlyDescr) 
        ]
        public virtual bool SolidColorOnly {
            get {
                return GetOption(NativeMethods.CC_SOLIDCOLOR); 
            }
            set { 
                SetOption(NativeMethods.CC_SOLIDCOLOR, value); 
            }
        } 

        /// 
        /// 
        ///     Lets us control the CHOOSECOLOR options. 
        /// 
        ///  
        private bool GetOption(int option) { 
            return(options & option) != 0;
        } 

        /// 
        /// 
        ///     
        ///       Resets
        ///       all options to their 
        ///       default values, the last selected color to black, and the custom 
        ///       colors to their default values.
        ///     
        /// 
        public override void Reset() {
            options = 0;
            color = Color.Black; 
            CustomColors = null;
        } 
 
 	private void ResetColor() {
		Color = Color.Black; 
	}

        /// 
        ///  
        /// 
        ///  
        protected override bool RunDialog(IntPtr hwndOwner) { 

            NativeMethods.WndProc hookProcPtr = new NativeMethods.WndProc(this.HookProc); 
            NativeMethods.CHOOSECOLOR cc = new NativeMethods.CHOOSECOLOR();
            IntPtr custColorPtr = Marshal.AllocCoTaskMem(64);
            try {
                Marshal.Copy(customColors, 0, custColorPtr, 16); 
                cc.hwndOwner = hwndOwner;
                cc.hInstance = Instance; 
                cc.rgbResult = ColorTranslator.ToWin32(color); 
                cc.lpCustColors = custColorPtr;
 
                int flags = Options | (NativeMethods.CC_RGBINIT | NativeMethods.CC_ENABLEHOOK);
                // Our docs say AllowFullOpen takes precedence over FullOpen; ChooseColor implements the opposite
                if (!AllowFullOpen)
                    flags &= ~NativeMethods.CC_FULLOPEN; 
                cc.Flags = flags;
 
                cc.lpfnHook = hookProcPtr; 
                if (!SafeNativeMethods.ChooseColor(cc)) return false;
                if (cc.rgbResult != ColorTranslator.ToWin32(color)) color = ColorTranslator.FromOle(cc.rgbResult); 
                Marshal.Copy(custColorPtr, customColors, 0, 16);
                return true;
            }
            finally { 
                Marshal.FreeCoTaskMem(custColorPtr);
            } 
        } 

        ///  
        /// 
        ///     Allows us to manipulate the CHOOSECOLOR options
        /// 
        ///  
        private void SetOption(int option, bool value) {
            if (value) { 
                options |= option; 
            }
            else { 
                options &= ~option;
            }
        }
 
        /// 
        ///  
        ///     
        ///       Indicates whether the  property should be
        ///       persisted. 
        ///    
        /// 
        private bool ShouldSerializeColor() {
            return !Color.Equals(Color.Black); 
        }
 
        ///  
        /// 
        ///  
        ///    
        ///       Provides a string version of this object.
        ///    
        ///  
        public override string ToString() {
            string s = base.ToString(); 
            return s + ",  Color: " + Color.ToString(); 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ColorDialog.cs source code in C# .NET

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