Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / PaintEvent.cs / 1305376 / PaintEvent.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms { using Microsoft.Win32; using System; using System.ComponentModel; using System.Diagnostics; using System.Drawing; using System.Windows.Forms.Internal; using System.Drawing.Drawing2D; using System.Runtime.InteropServices; ////// /// // NOTE: Please keep this class consistent with PrintPageEventArgs. public class PaintEventArgs : EventArgs, IDisposable { ////// Provides data for the ////// event. /// /// Graphics object with which painting should be done. /// private Graphics graphics = null; // See ResetGraphics() private GraphicsState savedGraphicsState = null; ////// DC (Display context) for obtaining the graphics object. Used to delay getting the graphics /// object until absolutely necessary (for perf reasons) /// private readonly IntPtr dc = IntPtr.Zero; IntPtr oldPal = IntPtr.Zero; ////// Rectangle into which all painting should be done. /// private readonly Rectangle clipRect; //private Control paletteSource; #if DEBUG static readonly TraceSwitch PaintEventFinalizationSwitch = new TraceSwitch("PaintEventFinalization", "Tracks the creation and finalization of PaintEvent objects"); internal static string GetAllocationStack() { if (PaintEventFinalizationSwitch.TraceVerbose) { return Environment.StackTrace; } else { return "Enabled 'PaintEventFinalization' trace switch to see stack of allocation"; } } private string AllocationSite = PaintEventArgs.GetAllocationStack(); #endif ////// /// public PaintEventArgs(Graphics graphics, Rectangle clipRect) { if( graphics == null ){ throw new ArgumentNullException("graphics"); } this.graphics = graphics; this.clipRect = clipRect; } // Internal version of constructor for performance // We try to avoid getting the graphics object until needed internal PaintEventArgs(IntPtr dc, Rectangle clipRect) { Debug.Assert(dc != IntPtr.Zero, "dc is not initialized."); this.dc = dc; this.clipRect = clipRect; } ////// Initializes a new instance of the ///class with the specified graphics and /// clipping rectangle. /// ~PaintEventArgs() { Dispose(false); } /// /// /// public Rectangle ClipRectangle { get { return clipRect; } } ////// Gets the /// rectangle in which to paint. /// ////// Gets the HDC this paint event is connected to. If there is no associated /// HDC, or the GDI+ Graphics object has been created (meaning GDI+ now owns the /// HDC), 0 is returned. /// /// internal IntPtr HDC { get { if (graphics == null) return dc; else return IntPtr.Zero; } } ////// /// public System.Drawing.Graphics Graphics { get { if (graphics == null && dc != IntPtr.Zero) { oldPal = Control.SetUpPalette(dc, false /*force*/, false /*realize*/); graphics = Graphics.FromHdcInternal(dc); graphics.PageUnit = GraphicsUnit.Pixel; savedGraphicsState = graphics.Save(); // See ResetGraphics() below } return graphics; } } // We want a way to dispose the GDI+ Graphics, but we don't want to create one // simply to dispose it // cpr: should be internal ////// Gets the ////// object used to /// paint. /// /// /// public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } ////// Disposes /// of the resources (other than memory) used by the ///. /// protected virtual void Dispose(bool disposing) { #if DEBUG Debug.Assert(disposing, "PaintEvent object should be explicitly disposed. Potential GDI multithreading lock issue. Allocation stack:\r\n" + AllocationSite); #endif if (disposing) { //only dispose the graphics object if we created it via the dc. if (graphics != null && dc != IntPtr.Zero) { graphics.Dispose(); } } if (oldPal != IntPtr.Zero && dc != IntPtr.Zero) { SafeNativeMethods.SelectPalette(new HandleRef(this, dc), new HandleRef(this, oldPal), 0); oldPal = IntPtr.Zero; } } // If ControlStyles.AllPaintingInWmPaint, we call this method // after OnPaintBackground so it appears to OnPaint that it's getting a fresh // Graphics. We want to make sure AllPaintingInWmPaint is purely an optimization, // and doesn't change behavior, so we need to make sure any clipping regions established // in OnPaintBackground don't apply to OnPaint. See ASURT 44682. internal void ResetGraphics() { if (graphics != null) { Debug.Assert(dc == IntPtr.Zero || savedGraphicsState != null, "Called ResetGraphics more than once?"); if (savedGraphicsState != null) { graphics.Restore(savedGraphicsState); savedGraphicsState = null; } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ // // Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms { using Microsoft.Win32; using System; using System.ComponentModel; using System.Diagnostics; using System.Drawing; using System.Windows.Forms.Internal; using System.Drawing.Drawing2D; using System.Runtime.InteropServices; ////// /// // NOTE: Please keep this class consistent with PrintPageEventArgs. public class PaintEventArgs : EventArgs, IDisposable { ////// Provides data for the ////// event. /// /// Graphics object with which painting should be done. /// private Graphics graphics = null; // See ResetGraphics() private GraphicsState savedGraphicsState = null; ////// DC (Display context) for obtaining the graphics object. Used to delay getting the graphics /// object until absolutely necessary (for perf reasons) /// private readonly IntPtr dc = IntPtr.Zero; IntPtr oldPal = IntPtr.Zero; ////// Rectangle into which all painting should be done. /// private readonly Rectangle clipRect; //private Control paletteSource; #if DEBUG static readonly TraceSwitch PaintEventFinalizationSwitch = new TraceSwitch("PaintEventFinalization", "Tracks the creation and finalization of PaintEvent objects"); internal static string GetAllocationStack() { if (PaintEventFinalizationSwitch.TraceVerbose) { return Environment.StackTrace; } else { return "Enabled 'PaintEventFinalization' trace switch to see stack of allocation"; } } private string AllocationSite = PaintEventArgs.GetAllocationStack(); #endif ////// /// public PaintEventArgs(Graphics graphics, Rectangle clipRect) { if( graphics == null ){ throw new ArgumentNullException("graphics"); } this.graphics = graphics; this.clipRect = clipRect; } // Internal version of constructor for performance // We try to avoid getting the graphics object until needed internal PaintEventArgs(IntPtr dc, Rectangle clipRect) { Debug.Assert(dc != IntPtr.Zero, "dc is not initialized."); this.dc = dc; this.clipRect = clipRect; } ////// Initializes a new instance of the ///class with the specified graphics and /// clipping rectangle. /// ~PaintEventArgs() { Dispose(false); } /// /// /// public Rectangle ClipRectangle { get { return clipRect; } } ////// Gets the /// rectangle in which to paint. /// ////// Gets the HDC this paint event is connected to. If there is no associated /// HDC, or the GDI+ Graphics object has been created (meaning GDI+ now owns the /// HDC), 0 is returned. /// /// internal IntPtr HDC { get { if (graphics == null) return dc; else return IntPtr.Zero; } } ////// /// public System.Drawing.Graphics Graphics { get { if (graphics == null && dc != IntPtr.Zero) { oldPal = Control.SetUpPalette(dc, false /*force*/, false /*realize*/); graphics = Graphics.FromHdcInternal(dc); graphics.PageUnit = GraphicsUnit.Pixel; savedGraphicsState = graphics.Save(); // See ResetGraphics() below } return graphics; } } // We want a way to dispose the GDI+ Graphics, but we don't want to create one // simply to dispose it // cpr: should be internal ////// Gets the ////// object used to /// paint. /// /// /// public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } ////// Disposes /// of the resources (other than memory) used by the ///. /// protected virtual void Dispose(bool disposing) { #if DEBUG Debug.Assert(disposing, "PaintEvent object should be explicitly disposed. Potential GDI multithreading lock issue. Allocation stack:\r\n" + AllocationSite); #endif if (disposing) { //only dispose the graphics object if we created it via the dc. if (graphics != null && dc != IntPtr.Zero) { graphics.Dispose(); } } if (oldPal != IntPtr.Zero && dc != IntPtr.Zero) { SafeNativeMethods.SelectPalette(new HandleRef(this, dc), new HandleRef(this, oldPal), 0); oldPal = IntPtr.Zero; } } // If ControlStyles.AllPaintingInWmPaint, we call this method // after OnPaintBackground so it appears to OnPaint that it's getting a fresh // Graphics. We want to make sure AllPaintingInWmPaint is purely an optimization, // and doesn't change behavior, so we need to make sure any clipping regions established // in OnPaintBackground don't apply to OnPaint. See ASURT 44682. internal void ResetGraphics() { if (graphics != null) { Debug.Assert(dc == IntPtr.Zero || savedGraphicsState != null, "Called ResetGraphics more than once?"); if (savedGraphicsState != null) { graphics.Restore(savedGraphicsState); savedGraphicsState = null; } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ToolboxBitmapAttribute.cs
- ClientScriptManager.cs
- BuildProviderUtils.cs
- AsymmetricKeyExchangeDeformatter.cs
- WindowsFormsSynchronizationContext.cs
- XmlSchemaException.cs
- ExtensibleClassFactory.cs
- TreeViewHitTestInfo.cs
- CurrentChangingEventArgs.cs
- OperationCanceledException.cs
- EventSource.cs
- OrderByBuilder.cs
- Material.cs
- IISUnsafeMethods.cs
- BulletedListEventArgs.cs
- TakeQueryOptionExpression.cs
- ApplicationActivator.cs
- HyperLinkStyle.cs
- UseManagedPresentationBindingElement.cs
- ProfileSettingsCollection.cs
- GacUtil.cs
- TriState.cs
- Parameter.cs
- RuntimeArgumentHandle.cs
- EntityConnectionStringBuilderItem.cs
- BindUriHelper.cs
- DnsPermission.cs
- ExecutionTracker.cs
- StringUtil.cs
- FixedSOMTextRun.cs
- Evaluator.cs
- TablePatternIdentifiers.cs
- ClientSettingsSection.cs
- SequentialOutput.cs
- RouteParser.cs
- assertwrapper.cs
- EmptyQuery.cs
- DataGridPagerStyle.cs
- ConfigurationStrings.cs
- Vector3DAnimation.cs
- ADMembershipProvider.cs
- FocusManager.cs
- MappingException.cs
- MessagingDescriptionAttribute.cs
- PersonalizationProviderCollection.cs
- ArgIterator.cs
- DataGridViewBand.cs
- SQLDouble.cs
- PersistenceContextEnlistment.cs
- ListBindingHelper.cs
- CellIdBoolean.cs
- OciLobLocator.cs
- EndpointConfigContainer.cs
- ImageFormat.cs
- NamedObject.cs
- Figure.cs
- KeyGestureValueSerializer.cs
- ComponentResourceManager.cs
- SqlFacetAttribute.cs
- SecUtil.cs
- WebPartUserCapability.cs
- XmlElement.cs
- XmlAttributeCollection.cs
- InvalidateEvent.cs
- MachineSettingsSection.cs
- ADConnectionHelper.cs
- ConversionContext.cs
- InfoCardCryptoHelper.cs
- OracleDataReader.cs
- ResourceWriter.cs
- ReferencedType.cs
- ObjectMaterializedEventArgs.cs
- Function.cs
- SymLanguageVendor.cs
- SimpleType.cs
- ColumnMapTranslator.cs
- PerformanceCounter.cs
- StreamUpdate.cs
- KoreanCalendar.cs
- TouchPoint.cs
- SymDocumentType.cs
- WsrmTraceRecord.cs
- CatalogPartCollection.cs
- SetterBase.cs
- ButtonPopupAdapter.cs
- FrameworkPropertyMetadata.cs
- Msec.cs
- GenericParameterDataContract.cs
- TextEditorSelection.cs
- OleDbRowUpdatingEvent.cs
- XmlSchemaAnnotation.cs
- WebPartsPersonalizationAuthorization.cs
- CqlIdentifiers.cs
- SqlConnectionManager.cs
- StateWorkerRequest.cs
- HttpRequestMessageProperty.cs
- TextDpi.cs
- ContextMenuStrip.cs
- ImageButton.cs
- SeekStoryboard.cs