Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Misc / GDI / DeviceContexts.cs / 3 / 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)) { activeDeviceContexts.Add(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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- PersistenceTypeAttribute.cs
- ScriptResourceHandler.cs
- Soap12FormatExtensions.cs
- _NegoState.cs
- DataColumn.cs
- CheckBox.cs
- ExecutionContext.cs
- BuildProviderCollection.cs
- Int16Storage.cs
- _CommandStream.cs
- ResXResourceSet.cs
- StdRegProviderWrapper.cs
- latinshape.cs
- MultiSelector.cs
- ResourceReferenceExpressionConverter.cs
- SimpleLine.cs
- CssTextWriter.cs
- TraceLog.cs
- X509ClientCertificateCredentialsElement.cs
- Char.cs
- ToolStrip.cs
- _OSSOCK.cs
- BamlLocalizableResourceKey.cs
- ClientConfigurationHost.cs
- TabItemAutomationPeer.cs
- ApplicationBuildProvider.cs
- FontEmbeddingManager.cs
- HostingEnvironment.cs
- ClickablePoint.cs
- BaseTemplateBuildProvider.cs
- SchemaTableColumn.cs
- Descriptor.cs
- CLRBindingWorker.cs
- KeyedCollection.cs
- Rotation3D.cs
- ConnectionManagementElement.cs
- ColumnHeaderCollectionEditor.cs
- SystemTcpStatistics.cs
- ListView.cs
- CodeChecksumPragma.cs
- PathNode.cs
- ProfileElement.cs
- WebEvents.cs
- DoubleLink.cs
- SmiTypedGetterSetter.cs
- MimePart.cs
- ConnectionConsumerAttribute.cs
- TypeContext.cs
- SQLMembershipProvider.cs
- StreamReader.cs
- WebServiceEnumData.cs
- MemberRestriction.cs
- DataGridViewLinkCell.cs
- ErrorProvider.cs
- HelpInfo.cs
- HtmlTableCell.cs
- Hash.cs
- Size3D.cs
- _LocalDataStoreMgr.cs
- StrokeSerializer.cs
- CompilerErrorCollection.cs
- GridViewDesigner.cs
- Point4DValueSerializer.cs
- FlowLayoutPanel.cs
- PhysicalFontFamily.cs
- PassportAuthentication.cs
- FlowNode.cs
- SqlWriter.cs
- DataGridCellAutomationPeer.cs
- BehaviorEditorPart.cs
- ImageList.cs
- CharKeyFrameCollection.cs
- SingleTagSectionHandler.cs
- InitializationEventAttribute.cs
- Matrix3DStack.cs
- JulianCalendar.cs
- Identity.cs
- LateBoundBitmapDecoder.cs
- CharacterMetrics.cs
- AudioStateChangedEventArgs.cs
- HtmlDocument.cs
- XPathNodeList.cs
- NavigatingCancelEventArgs.cs
- CrossSiteScriptingValidation.cs
- SendKeys.cs
- EdgeModeValidation.cs
- ControllableStoryboardAction.cs
- HttpResponse.cs
- SQLInt64Storage.cs
- Vector3DCollection.cs
- WebDescriptionAttribute.cs
- FunctionParameter.cs
- RepeatButtonAutomationPeer.cs
- DataControlCommands.cs
- SingleTagSectionHandler.cs
- SystemEvents.cs
- NamespaceQuery.cs
- RSAOAEPKeyExchangeFormatter.cs
- TextAdaptor.cs
- StringAttributeCollection.cs