Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / 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
- oledbconnectionstring.cs
- StateMachine.cs
- CodeDOMUtility.cs
- BindableAttribute.cs
- DataControlPagerLinkButton.cs
- DataColumnMappingCollection.cs
- Vector3DCollection.cs
- KeyProperty.cs
- D3DImage.cs
- EpmTargetPathSegment.cs
- Rectangle.cs
- LocalBuilder.cs
- RPIdentityRequirement.cs
- DesignerAttribute.cs
- VarRemapper.cs
- EntityException.cs
- RecognitionResult.cs
- InvokeBase.cs
- KeyValueInternalCollection.cs
- ParseChildrenAsPropertiesAttribute.cs
- HtmlTableRow.cs
- SqlDeflator.cs
- TextEditorLists.cs
- SystemIcmpV4Statistics.cs
- InkCanvasAutomationPeer.cs
- CodeDomLoader.cs
- ListViewGroupItemCollection.cs
- ButtonBase.cs
- CodeDOMUtility.cs
- TraceListener.cs
- ipaddressinformationcollection.cs
- FileChangeNotifier.cs
- MetadataArtifactLoaderCompositeResource.cs
- ConfigXmlText.cs
- BufferBuilder.cs
- shaperfactory.cs
- AsymmetricAlgorithm.cs
- SiteMapNodeCollection.cs
- DataGridViewRowDividerDoubleClickEventArgs.cs
- WithStatement.cs
- TableHeaderCell.cs
- Listbox.cs
- SmiMetaData.cs
- LongValidator.cs
- DataPagerFieldCollection.cs
- ClientApiGenerator.cs
- COAUTHINFO.cs
- SignatureToken.cs
- ActivityDesignerAccessibleObject.cs
- DrawingBrush.cs
- ScrollPattern.cs
- CodeAttributeDeclarationCollection.cs
- UpDownEvent.cs
- ControlTemplate.cs
- Site.cs
- NamespaceInfo.cs
- ComEventsMethod.cs
- SignerInfo.cs
- ActivityCompletionCallbackWrapper.cs
- XmlMembersMapping.cs
- ProjectionPath.cs
- ObjectNavigationPropertyMapping.cs
- SecurityPermission.cs
- JulianCalendar.cs
- ListViewContainer.cs
- ModuleBuilder.cs
- HttpPostedFileWrapper.cs
- MSAANativeProvider.cs
- XmlSerializerVersionAttribute.cs
- ObjectQueryProvider.cs
- LinearGradientBrush.cs
- MethodBuilder.cs
- MetaModel.cs
- TextRenderingModeValidation.cs
- KeyValueSerializer.cs
- DoubleAnimationBase.cs
- BamlLocalizableResource.cs
- EllipseGeometry.cs
- InvalidCommandTreeException.cs
- dtdvalidator.cs
- ApplicationTrust.cs
- SQLDecimalStorage.cs
- ReachFixedPageSerializer.cs
- ProviderConnectionPointCollection.cs
- Literal.cs
- XmlSerializerNamespaces.cs
- FontEditor.cs
- ClonableStack.cs
- XPathDocumentNavigator.cs
- ClientCultureInfo.cs
- ThreadPool.cs
- BuilderElements.cs
- VisualBrush.cs
- RegisteredHiddenField.cs
- XmlObjectSerializerWriteContext.cs
- Literal.cs
- SessionEndingCancelEventArgs.cs
- EntityViewContainer.cs
- RequiredAttributeAttribute.cs
- InterleavedZipPartStream.cs