Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / Misc / GDI / DeviceContexts.cs / 1 / DeviceContexts.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- #if WGCM_TEST_SUITE // Enable tracking when built for the test suites. #define TRACK_HDC #define GDI_FONT_CACHE_TRACK #endif #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.Collections.Generic; using System.Internal; using System.Diagnostics; using System.Drawing; using System.Threading; using Microsoft.Win32; ////// Keeps a cache of some graphics primitives. /// Created to improve performance of TextRenderer.MeasureText methods that don't receive a WindowsGraphics. /// This class mantains a cache of MRU WindowsFont objects in the process. (See VSWhidbey#301492). /// #if WINFORMS_PUBLIC_GRAPHICS_LIBRARY public #else internal #endif static class DeviceContexts { [ThreadStatic] private static ClientUtils.WeakRefCollection activeDeviceContexts; ////// WindowsGraphicsCacheManager needs to track DeviceContext /// objects so it can ask them if a font is in use before they /// it's deleted. internal static void AddDeviceContext(DeviceContext dc) { if (activeDeviceContexts == null) { activeDeviceContexts = new ClientUtils.WeakRefCollection(); activeDeviceContexts.RefCheckThreshold = 20; // See DevDiv#82664 (the repro app attached to this bug was used to determine this number). } if (!activeDeviceContexts.Contains(dc)) { dc.Disposing += new EventHandler(OnDcDisposing); activeDeviceContexts.Add(dc); } } private static void OnDcDisposing(object sender, EventArgs e) { DeviceContext dc = sender as DeviceContext; if (dc != null) { dc.Disposing -= new EventHandler(OnDcDisposing); RemoveDeviceContext(dc); } } internal static void RemoveDeviceContext(DeviceContext dc) { if (activeDeviceContexts == null) { return; } activeDeviceContexts.RemoveByHashCode(dc); } #if !DRAWING_NAMESPACE internal static bool IsFontInUse(WindowsFont wf) { if (wf == null) { return false; } for (int i = 0; i < activeDeviceContexts.Count; i++) { DeviceContext dc = activeDeviceContexts[i] as DeviceContext; if (dc != null && (dc.ActiveFont == wf || dc.IsFontOnContextStack(wf))) { return true; } } return false; } #endif } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ // // Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- #if WGCM_TEST_SUITE // Enable tracking when built for the test suites. #define TRACK_HDC #define GDI_FONT_CACHE_TRACK #endif #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.Collections.Generic; using System.Internal; using System.Diagnostics; using System.Drawing; using System.Threading; using Microsoft.Win32; ////// Keeps a cache of some graphics primitives. /// Created to improve performance of TextRenderer.MeasureText methods that don't receive a WindowsGraphics. /// This class mantains a cache of MRU WindowsFont objects in the process. (See VSWhidbey#301492). /// #if WINFORMS_PUBLIC_GRAPHICS_LIBRARY public #else internal #endif static class DeviceContexts { [ThreadStatic] private static ClientUtils.WeakRefCollection activeDeviceContexts; ////// WindowsGraphicsCacheManager needs to track DeviceContext /// objects so it can ask them if a font is in use before they /// it's deleted. internal static void AddDeviceContext(DeviceContext dc) { if (activeDeviceContexts == null) { activeDeviceContexts = new ClientUtils.WeakRefCollection(); activeDeviceContexts.RefCheckThreshold = 20; // See DevDiv#82664 (the repro app attached to this bug was used to determine this number). } if (!activeDeviceContexts.Contains(dc)) { dc.Disposing += new EventHandler(OnDcDisposing); activeDeviceContexts.Add(dc); } } private static void OnDcDisposing(object sender, EventArgs e) { DeviceContext dc = sender as DeviceContext; if (dc != null) { dc.Disposing -= new EventHandler(OnDcDisposing); RemoveDeviceContext(dc); } } internal static void RemoveDeviceContext(DeviceContext dc) { if (activeDeviceContexts == null) { return; } activeDeviceContexts.RemoveByHashCode(dc); } #if !DRAWING_NAMESPACE internal static bool IsFontInUse(WindowsFont wf) { if (wf == null) { return false; } for (int i = 0; i < activeDeviceContexts.Count; i++) { DeviceContext dc = activeDeviceContexts[i] as DeviceContext; if (dc != null && (dc.ActiveFont == wf || dc.IsFontOnContextStack(wf))) { return true; } } return false; } #endif } } // 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
- RoutingService.cs
- ManagedIStream.cs
- ClientProxyGenerator.cs
- TextShapeableCharacters.cs
- SqlGatherProducedAliases.cs
- RepeaterItemCollection.cs
- UnsupportedPolicyOptionsException.cs
- WrappedIUnknown.cs
- ErrorWebPart.cs
- CannotUnloadAppDomainException.cs
- DataContractJsonSerializerOperationFormatter.cs
- sqlstateclientmanager.cs
- ContentPosition.cs
- WindowPatternIdentifiers.cs
- TailCallAnalyzer.cs
- MulticastDelegate.cs
- OlePropertyStructs.cs
- ToolStripComboBox.cs
- TakeQueryOptionExpression.cs
- AsymmetricCryptoHandle.cs
- PropertyEmitter.cs
- XamlClipboardData.cs
- BitmapEffectRenderDataResource.cs
- ProfileGroupSettings.cs
- HwndSubclass.cs
- ObjectDataSourceMethodEventArgs.cs
- RemoteArgument.cs
- AttributeCollection.cs
- dbdatarecord.cs
- DbDataRecord.cs
- RenderData.cs
- XmlProcessingInstruction.cs
- Stacktrace.cs
- dataprotectionpermission.cs
- XmlUrlResolver.cs
- COM2ComponentEditor.cs
- PatternMatcher.cs
- BitmapEffectDrawing.cs
- RangeValueProviderWrapper.cs
- SoapConverter.cs
- ManualResetEvent.cs
- XmlMapping.cs
- PropertyNames.cs
- SectionXmlInfo.cs
- Compiler.cs
- CustomCategoryAttribute.cs
- DataGridItemAttachedStorage.cs
- LayoutTable.cs
- QilLiteral.cs
- LoginCancelEventArgs.cs
- SystemResourceHost.cs
- DataFieldEditor.cs
- DependencyPropertyConverter.cs
- TextWriterEngine.cs
- AsymmetricKeyExchangeDeformatter.cs
- DiagnosticTraceSource.cs
- BinHexEncoding.cs
- SecurityTokenInclusionMode.cs
- FlatButtonAppearance.cs
- DesignerProperties.cs
- TemplateBindingExtensionConverter.cs
- odbcmetadatacollectionnames.cs
- SspiWrapper.cs
- _KerberosClient.cs
- Internal.cs
- Internal.cs
- GroupLabel.cs
- OpCopier.cs
- Figure.cs
- CreateParams.cs
- NumericPagerField.cs
- ToolboxItemSnapLineBehavior.cs
- PagePropertiesChangingEventArgs.cs
- SecureUICommand.cs
- PropertyGrid.cs
- CompressionTracing.cs
- Parameter.cs
- Region.cs
- HandleCollector.cs
- NullableDoubleMinMaxAggregationOperator.cs
- BindingSource.cs
- wgx_commands.cs
- BamlLocalizationDictionary.cs
- SQLDouble.cs
- AssemblyBuilderData.cs
- ArrayWithOffset.cs
- Currency.cs
- Pool.cs
- PreviewPageInfo.cs
- SqlCharStream.cs
- SystemIPv4InterfaceProperties.cs
- TargetInvocationException.cs
- ProxyWebPartManager.cs
- SiteOfOriginPart.cs
- ResourceCategoryAttribute.cs
- FormsAuthenticationUserCollection.cs
- XmlRawWriter.cs
- ETagAttribute.cs
- ContainerFilterService.cs
- ExceptionUtil.cs