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
- HScrollBar.cs
- LogicalExpr.cs
- PropertyValue.cs
- DateTimePickerDesigner.cs
- WsatEtwTraceListener.cs
- DeclarativeCatalogPart.cs
- StrokeCollection.cs
- ShaderEffect.cs
- RegexFCD.cs
- TableColumn.cs
- ReliableMessagingHelpers.cs
- SQLBoolean.cs
- NamedPermissionSet.cs
- MetadataArtifactLoaderXmlReaderWrapper.cs
- StringUtil.cs
- PlatformNotSupportedException.cs
- TraceXPathNavigator.cs
- FormatSelectingMessageInspector.cs
- PersistenceTypeAttribute.cs
- ObjectStateEntryDbUpdatableDataRecord.cs
- DataBindingHandlerAttribute.cs
- SafeThemeHandle.cs
- BasePattern.cs
- _FtpControlStream.cs
- IBuiltInEvidence.cs
- LinkedResourceCollection.cs
- DbConnectionOptions.cs
- KeyInterop.cs
- ActionFrame.cs
- IsolatedStorageFile.cs
- DependencyObjectCodeDomSerializer.cs
- FontDriver.cs
- MaterialCollection.cs
- OperatingSystem.cs
- ImageAttributes.cs
- XmlSecureResolver.cs
- XmlToDatasetMap.cs
- FontStretchConverter.cs
- SQLMoney.cs
- PagesChangedEventArgs.cs
- BaseParser.cs
- CompiledQuery.cs
- GridItemCollection.cs
- HtmlImage.cs
- RenamedEventArgs.cs
- IndexedEnumerable.cs
- figurelengthconverter.cs
- WebPartZoneCollection.cs
- ClickablePoint.cs
- SafeHandles.cs
- Stack.cs
- WindowInteropHelper.cs
- GraphicsPathIterator.cs
- PathFigureCollection.cs
- counter.cs
- DateTimeConstantAttribute.cs
- OpenFileDialog.cs
- EmptyCollection.cs
- QueryPrefixOp.cs
- XPathConvert.cs
- SerializationStore.cs
- DataGridViewImageCell.cs
- MultiBindingExpression.cs
- BrowserDefinitionCollection.cs
- CustomExpressionEventArgs.cs
- PathParser.cs
- RuntimeCompatibilityAttribute.cs
- CodeLabeledStatement.cs
- RoleService.cs
- ObjectStateEntryDbUpdatableDataRecord.cs
- DataGridViewCellValueEventArgs.cs
- ProtectedConfigurationProviderCollection.cs
- FlowPosition.cs
- ExpressionPrefixAttribute.cs
- dsa.cs
- NestPullup.cs
- HierarchicalDataBoundControlAdapter.cs
- SoapMessage.cs
- SettingsAttributeDictionary.cs
- SessionEndingEventArgs.cs
- PersonalizableTypeEntry.cs
- DateBoldEvent.cs
- BulletedListDesigner.cs
- ConfigXmlSignificantWhitespace.cs
- DCSafeHandle.cs
- XmlSchemaSimpleType.cs
- QueryOptionExpression.cs
- Matrix3D.cs
- PenThreadWorker.cs
- RootDesignerSerializerAttribute.cs
- MenuItem.cs
- Triplet.cs
- BuildManager.cs
- SurrogateSelector.cs
- TypeListConverter.cs
- TemplatePagerField.cs
- DbParameterHelper.cs
- ApplicationSecurityInfo.cs
- ListViewGroupCollectionEditor.cs
- DataGridViewLinkColumn.cs