Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Misc / GDI / WindowsBrush.cs / 1 / WindowsBrush.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- [assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode", Scope="member", Target="System.Windows.Forms.Internal.WindowsBrush.FromLogBrush(System.Windows.Forms.Internal.IntNativeMethods+LOGBRUSH):System.Windows.Forms.Internal.WindowsBrush")] [assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode", Scope="member", Target="System.Windows.Forms.Internal.WindowsBrush.FromHdc(System.IntPtr):System.Windows.Forms.Internal.WindowsBrush")] [assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode", Scope="member", Target="System.Windows.Forms.Internal.WindowsBrush.FromBrush(System.Drawing.Brush):System.Windows.Forms.Internal.WindowsBrush")] #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; ////// #if WINFORMS_PUBLIC_GRAPHICS_LIBRARY public #else internal #endif abstract class WindowsBrush : MarshalByRefObject, ICloneable, IDisposable { // Handle to the native Windows brush object. // private DeviceContext dc; private IntPtr nativeHandle; // Cannot be protected because the class is internal (C# doesn't allow it). private Color color = Color.White; // GDI brushes have just one color as opposed to GDI+ that can have background color. // Note: We may need to implement background color too. #if WINGRAPHICS_FINALIZATION_WATCH private string AllocationSite = DbgUtil.StackTrace; #endif public abstract object Clone(); // Declaration required by C# even though this is an abstract class. protected abstract void CreateBrush(); ////// Encapsulates a GDI Brush object. /// ////// Parameterless constructor to use default color. /// Notice that the actual object construction is done in the derived classes. /// public WindowsBrush(DeviceContext dc) { this.dc = dc; } public WindowsBrush(DeviceContext dc, Color color) { this.dc = dc; this.color = color; } ~WindowsBrush() { Dispose(false); } protected DeviceContext DC { get { return this.dc; } } public void Dispose() { Dispose(true); } protected virtual void Dispose(bool disposing) { if (dc != null && this.nativeHandle != IntPtr.Zero) { DbgUtil.AssertFinalization(this, disposing); dc.DeleteObject(this.nativeHandle, GdiObjectType.Brush); this.nativeHandle = IntPtr.Zero; } if (disposing) { GC.SuppressFinalize(this); } } public Color Color { get { return this.color; } } ////// Gets the native Win32 brush handle. It creates it on demand. /// protected IntPtr NativeHandle { get { if( this.nativeHandle == IntPtr.Zero ) { CreateBrush(); } return this.nativeHandle; } set { Debug.Assert(this.nativeHandle == IntPtr.Zero, "WindowsBrush object is immutable"); Debug.Assert(value != IntPtr.Zero, "WARNING: assigning IntPtr.Zero to the nativeHandle object."); this.nativeHandle = value; } } #if WINFORMS_PUBLIC_GRAPHICS_LIBRARY ////// Derived classes implement this method to get a native GDI brush wrapper with the same /// properties as this object. /// public static WindowsBrush FromBrush(DeviceContext dc, Brush originalBrush) { if(originalBrush is SolidBrush) { return new WindowsSolidBrush(dc, ((SolidBrush)originalBrush).Color); } if(originalBrush is System.Drawing.Drawing2D.HatchBrush) { System.Drawing.Drawing2D.HatchBrush hatchBrush = ((System.Drawing.Drawing2D.HatchBrush)originalBrush); return new WindowsHatchBrush(dc, (WindowsHatchStyle) hatchBrush.HatchStyle, hatchBrush.ForegroundColor, hatchBrush.BackgroundColor); } /* */ Debug.Fail("Don't know how to convert this brush!"); return null; } ////// Creates a WindowsBrush from the DC currently selected HBRUSH /// public static WindowsBrush FromDC(DeviceContext dc) { IntPtr hBrush = IntUnsafeNativeMethods.GetCurrentObject(new HandleRef(null, dc.Hdc), IntNativeMethods.OBJ_BRUSH); IntNativeMethods.LOGBRUSH logBrush = new IntNativeMethods.LOGBRUSH(); IntUnsafeNativeMethods.GetObject(new HandleRef(null, hBrush), logBrush); // don't call DeleteObject on handle from GetCurrentObject, it is the one selected in the hdc. return WindowsBrush.FromLogBrush(dc, logBrush ); } ////// Creates a WindowsBrush from a LOGBRUSH. /// public static WindowsBrush FromLogBrush( DeviceContext dc, IntNativeMethods.LOGBRUSH logBrush ) { Debug.Assert( logBrush != null, "logBrush is null" ); switch( logBrush.lbStyle ) { // currently supported brushes: case IntNativeMethods.BS_HATCHED: return new WindowsHatchBrush(dc, (WindowsHatchStyle) logBrush.lbHatch ); case IntNativeMethods.BS_SOLID: return new WindowsSolidBrush( dc, Color.FromArgb(logBrush.lbColor) ); default: Debug.Fail( "Don't know how to create WindowsBrush from specified logBrush" ); return null; } } #endif ////// public IntPtr HBrush { get { return this.NativeHandle; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved./// Returns the native Win32 brush handle. /// ///
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