WindowsPen.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Misc / GDI / WindowsPen.cs / 1 / WindowsPen.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

#if WINFORMS_NAMESPACE 
namespace System.Windows.Forms.Internal 
#elif DRAWING_NAMESPACE
namespace System.Drawing.Internal 
#else
namespace System.Experimental.Gdi
#endif
{ 
    using System;
    using System.Internal; 
    using System.Runtime.InteropServices; 
    using System.ComponentModel;
    using System.Diagnostics; 
    using System.Drawing;
    using System.Drawing.Drawing2D;
    using System.Globalization;
 

    ///  
    ///      
    ///         Encapsulates a GDI Pen object.
    ///      
    /// 
#if WINFORMS_PUBLIC_GRAPHICS_LIBRARY
    public
#else 
    internal
#endif 
    sealed partial class WindowsPen : MarshalByRefObject, ICloneable, IDisposable 
    {
        // 
        // Handle to the native Windows pen object.
        //
        private IntPtr nativeHandle;
 
        private const int dashStyleMask = 0x0000000F;
        private const int endCapMask    = 0x00000F00; 
        private const int joinMask      = 0x0000F000; 

        private DeviceContext dc; 

        //
        // Fields with default values
        // 
        private WindowsBrush wndBrush;
        private WindowsPenStyle style; 
        private Color color; 
        private int width;
 
        private const int cosmeticPenWidth = 1;  // Cosmetic pen width.

#if GDI_FINALIZATION_WATCH
        private string AllocationSite = DbgUtil.StackTrace; 
#endif
 
        public WindowsPen(DeviceContext dc) : 
            this( dc, WindowsPenStyle.Default, cosmeticPenWidth, Color.Black )
        { 
        }

        public WindowsPen(DeviceContext dc, Color color ) :
            this( dc, WindowsPenStyle.Default, cosmeticPenWidth, color ) 
        {
        } 
 
        public WindowsPen(DeviceContext dc, WindowsBrush windowsBrush ) :
            this( dc, WindowsPenStyle.Default, cosmeticPenWidth, windowsBrush ) 
        {
        }

        public WindowsPen(DeviceContext dc, WindowsPenStyle style, int width, Color color) 
        {
            this.style = style; 
            this.width = width; 
            this.color = color;
            this.dc    = dc; 

            // CreatePen() created on demand.
        }
 
        public WindowsPen(DeviceContext dc, WindowsPenStyle style, int width, WindowsBrush windowsBrush )
        { 
            Debug.Assert(windowsBrush != null, "null windowsBrush" ); 

            this.style    = style; 
            this.wndBrush = (WindowsBrush) windowsBrush.Clone();
            this.width    = width;
            this.color    = windowsBrush.Color;
            this.dc       = dc; 

            // CreatePen() created on demand. 
        } 

        private void CreatePen() 
        {
            if (this.width > 1)    // Geometric pen.
            {
                // From MSDN: if width > 1, the style must be PS_NULL, PS_SOLID, or PS_INSIDEFRAME. 
                this.style |= WindowsPenStyle.Geometric | WindowsPenStyle.Solid;
            } 
 
            if (this.wndBrush == null)
            { 
                this.nativeHandle = IntSafeNativeMethods.CreatePen((int) this.style, this.width, ColorTranslator.ToWin32(this.color) );
            }
            else
            { 
                IntNativeMethods.LOGBRUSH lb = new IntNativeMethods.LOGBRUSH();
 
                lb.lbColor = ColorTranslator.ToWin32( this.wndBrush.Color ); 
                lb.lbStyle = IntNativeMethods.BS_SOLID;
                lb.lbHatch = 0; // 

                // Note: We currently don't support custom styles, that's why 0 and null for last two params.
                this.nativeHandle = IntSafeNativeMethods.ExtCreatePen((int)this.style, this.width, lb, 0, null );
            } 
        }
 
        public object Clone() 
        {
            return (this.wndBrush != null) ? 
                new WindowsPen(this.dc, this.style, this.width, (WindowsBrush) this.wndBrush.Clone()) :
                new WindowsPen(this.dc, this.style, this.width, this.color);
        }
 
        ~WindowsPen()
        { 
            Dispose(false); 
        }
 
        public void Dispose()
        {
            Dispose(true);
        } 

        void Dispose(bool disposing) 
        { 
            if (this.nativeHandle != IntPtr.Zero && dc != null)
            { 
                DbgUtil.AssertFinalization(this, disposing);

                dc.DeleteObject(this.nativeHandle, GdiObjectType.Pen);
                this.nativeHandle = IntPtr.Zero; 
            }
 
            if (this.wndBrush != null) 
            {
                this.wndBrush.Dispose(); 
                this.wndBrush = null;
            }

            if (disposing) 
            {
                GC.SuppressFinalize(this); 
            } 
        }
 
        public IntPtr HPen
        {
            get
            { 
                if( this.nativeHandle == IntPtr.Zero )
                { 
                    CreatePen(); 
                }
 
                return this.nativeHandle;
            }
        }
 
        public override string ToString()
        { 
            return String.Format( CultureInfo.InvariantCulture, "{0}: Style={1}, Color={2}, Width={3}, Brush={4}", 
                this.GetType().Name,
                this.style, 
                this.color,
                this.width,
                this.wndBrush != null ? this.wndBrush.ToString() : "null" );
        } 
    }
 
} 

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

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