Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / Drawing / System / Drawing / Design / FontNameEditor.cs / 1 / FontNameEditor.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ namespace System.Drawing.Design { using Microsoft.Win32; using System; using System.Collections; using System.ComponentModel; using System.Diagnostics; using System.Diagnostics.CodeAnalysis; using System.Drawing; using System.IO; using System.Globalization; using System.Reflection; using System.Runtime.InteropServices; using System.Windows.Forms; using System.Windows.Forms.ComponentModel; using System.Windows.Forms.Design; ////// /// /// [System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.LinkDemand, Name="FullTrust")] [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand, Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)] [System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.InheritanceDemand, Name="FullTrust")] [System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.LinkDemand, Name="FullTrust")] public class FontNameEditor : UITypeEditor { ///Provides an editor that paints a glyph for the font name. ////// /// Determines if this editor supports the painting of a representation /// of an object's value. /// public override bool GetPaintValueSupported(ITypeDescriptorContext context) { return true; } ////// /// [SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers")] [SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes")] public override void PaintValue(PaintValueEventArgs e) { string fontName = e.Value as string; if (fontName != null) { if (fontName == "") { // don't draw anything if we don't have a value. return; } e.Graphics.FillRectangle(SystemBrushes.ActiveCaption, e.Bounds); FontFamily family = null; try { family = new FontFamily(fontName); } catch { // Ignore the exception if the fontName does not exist or is invalid... // we just won't render a preview of the font at all } if (family != null) { // Believe it or not, not all font families have a "normal" face. Try normal, then italic, // then bold, then bold italic, then give up. try { DrawFontSample(e, family, FontStyle.Regular); } catch { try { DrawFontSample(e, family, FontStyle.Italic); } catch { try { DrawFontSample(e, family, FontStyle.Bold); } catch { try { DrawFontSample(e, family, FontStyle.Bold | FontStyle.Italic); } catch { // No font style we can think of is supported } } } } } e.Graphics.DrawLine(SystemPens.WindowFrame, e.Bounds.Right, e.Bounds.Y, e.Bounds.Right, e.Bounds.Bottom); } } // Tries to render sample of text in specified font and style, // throwing exception if specified font does not support that style... // [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2000:DisposeObjectsBeforeLosingScope")] static private void DrawFontSample(PaintValueEventArgs e, FontFamily fontFamily, FontStyle fontStyle) { float fontSize = (float) (e.Bounds.Height / 1.2); Font font = new Font(fontFamily, fontSize, fontStyle, GraphicsUnit.Pixel); if (font == null) { return; } try { e.Graphics.DrawString("abcd", font, SystemBrushes.ActiveCaptionText, e.Bounds); } finally { font.Dispose(); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved./// Paints a representative value of the given object to the provided /// canvas. Painting should be done within the boundaries of the /// provided rectangle. /// ///
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