Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / fx / src / Misc / GDI / DeviceContexts.cs / 5 / 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
- BindingContext.cs
- sortedlist.cs
- SByteStorage.cs
- Internal.cs
- ItemContainerGenerator.cs
- ImageAnimator.cs
- Range.cs
- _DigestClient.cs
- EntityObject.cs
- MobileUserControlDesigner.cs
- AmbiguousMatchException.cs
- CleanUpVirtualizedItemEventArgs.cs
- ItemAutomationPeer.cs
- ThemeableAttribute.cs
- DataGridViewRowConverter.cs
- ScriptingScriptResourceHandlerSection.cs
- HtmlGenericControl.cs
- ICollection.cs
- FixedHighlight.cs
- ContainerUIElement3D.cs
- Mouse.cs
- DataFieldConverter.cs
- Axis.cs
- WebResourceAttribute.cs
- ManualResetEvent.cs
- EntityDataSourceColumn.cs
- EntityDataSourceValidationException.cs
- DATA_BLOB.cs
- ExtendedPropertyDescriptor.cs
- CompiledQuery.cs
- DataDocumentXPathNavigator.cs
- PersistNameAttribute.cs
- CustomError.cs
- CompilerError.cs
- CodeCompileUnit.cs
- SecurityPermission.cs
- ProxyManager.cs
- BuildManagerHost.cs
- ArithmeticException.cs
- ApplicationProxyInternal.cs
- EntityReference.cs
- MULTI_QI.cs
- RotationValidation.cs
- GridViewUpdateEventArgs.cs
- Int32KeyFrameCollection.cs
- MenuItemStyleCollection.cs
- PrintDialog.cs
- PropertyPushdownHelper.cs
- ModelItemCollectionImpl.cs
- UInt16.cs
- Duration.cs
- sitestring.cs
- MessageAction.cs
- CapabilitiesAssignment.cs
- PartialClassGenerationTaskInternal.cs
- ProfilePropertyNameValidator.cs
- DataGridRelationshipRow.cs
- DesignRelation.cs
- Crc32.cs
- ScriptHandlerFactory.cs
- RadioButtonFlatAdapter.cs
- FixedSOMImage.cs
- StandardTransformFactory.cs
- FlowchartSizeFeature.cs
- IntSecurity.cs
- TreeNodeCollection.cs
- LogWriteRestartAreaAsyncResult.cs
- BindingExpressionUncommonField.cs
- GenericEnumerator.cs
- Size3DValueSerializer.cs
- SubMenuStyleCollection.cs
- DefaultAssemblyResolver.cs
- TransactionTraceIdentifier.cs
- XmlComplianceUtil.cs
- GACMembershipCondition.cs
- _ConnectionGroup.cs
- TrackBarRenderer.cs
- CodeTypeConstructor.cs
- Simplifier.cs
- HMACSHA512.cs
- ControlBindingsCollection.cs
- Model3DGroup.cs
- SqlCacheDependency.cs
- DbModificationCommandTree.cs
- StateDesigner.CommentLayoutGlyph.cs
- ObjectDataSourceMethodEventArgs.cs
- GridItem.cs
- ObservableDictionary.cs
- TileBrush.cs
- StructuredTypeEmitter.cs
- Validator.cs
- HttpCacheVary.cs
- HandlerMappingMemo.cs
- Binding.cs
- TimerEventSubscription.cs
- XslCompiledTransform.cs
- GridViewUpdateEventArgs.cs
- DockProviderWrapper.cs
- XmlAttributes.cs
- ContractNamespaceAttribute.cs