Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / DrawingContext.cs / 2 / DrawingContext.cs
//------------------------------------------------------------------------------ // Microsoft Avalon // Copyright (c) Microsoft Corporation, 2003 // // File: DrawingContext.cs // // History: // [....]: 04/19/2003 // Created it based on the RetainedDrawingContext used in the AvPhat branch. // [....]: 07/02/2003 // Turned this class into an abstract base class for RetainedDrawingContext // and PaintingDrawingContext. // //----------------------------------------------------------------------------- using System; using System.Security.Permissions; using System.Windows; using System.Windows.Threading; using System.Windows.Media.Animation; using System.Windows.Media; using System.Diagnostics; using MS.Internal; using System.Runtime.InteropServices; using MS.Utility; namespace System.Windows.Media { ////// Drawing context. /// public abstract partial class DrawingContext : DispatcherObject, IDisposable { #region Constructors ////// Default constructor for DrawingContext - this uses the current Dispatcher. /// internal DrawingContext() { // Nothing to do here } #endregion Constructors #region Public Methods ////// Draw Text at the location specified. /// /// The FormattedText to draw. /// The location at which to draw the text. ////// This call is illegal if this object has already been closed or disposed. /// public void DrawText(FormattedText formattedText, Point origin) { if (EventTrace.IsEnabled(EventTrace.Flags.performance, EventTrace.Level.verbose)) { EventTrace.EventProvider.TraceEvent(EventTrace.GuidFromId(EventTraceGuidId.GENERICSTRINGGUID), EventType.StartEvent, "DrawingContext.DrawText Start"); } VerifyApiNonstructuralChange(); #if DEBUG MediaTrace.DrawingContextOp.Trace("DrawText(const)"); #endif if (formattedText == null) { return; } formattedText.Draw(this, origin); if (EventTrace.IsEnabled(EventTrace.Flags.performance, EventTrace.Level.verbose)) { EventTrace.EventProvider.TraceEvent(EventTrace.GuidFromId(EventTraceGuidId.GENERICSTRINGGUID), EventType.EndEvent, "DrawingContext.DrawText End"); } } ////// Closes the DrawingContext and flushes the content. /// Afterwards the DrawingContext can not be used anymore. /// This call does not require all Push calls to have been Popped. /// ////// This call is illegal if this object has already been closed or disposed. /// public abstract void Close(); ////// This is the same as the Close call: /// Closes the DrawingContext and flushes the content. /// Afterwards the DrawingContext can not be used anymore. /// This call does not require all Push calls to have been Popped. /// ////// This call is illegal if this object has already been closed or disposed. /// void IDisposable.Dispose() { // Call a virtual method for derived Dispose implementations // // Attempting to override a explicit interface member implementation causes // the most-derived implementation to always be called, and the base // implementation becomes uncallable. But FxCop requires the base Dispose // method is always be called. To avoid this situation, we use the *Core // pattern for derived classes, instead of attempting to override // IDisposable.Dispose. VerifyAccess(); DisposeCore(); } #endregion Public Methods #region Protected Methods ////// Dispose functionality implemented by subclasses /// ////// This call is illegal if this object has already been closed or disposed. /// protected abstract void DisposeCore(); ////// This verifies that the API can be called for read only access. /// protected virtual void VerifyApiNonstructuralChange() { this.VerifyAccess(); } #endregion Protected Methods } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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