mcs/class/System.Drawing.Design/System.Drawing.Design/IconEditor.cs

   1 //
   2 // System.Drawing.Design.IconEditor.cs
   3 //
   4 // Authors:
   5 //   Martin Willemoes Hansen (mwh@sysrq.dk)
   6 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //
   8 // (C) 2003 Martin Willemoes Hansen
   9 // (C) 2003 Andreas Nahr
  10 //
  11
  12 using System;
  13 using System.Text;
  14 using System.IO;
  15 using System.Drawing;
  16 using System.ComponentModel;
  17 using System.Windows.Forms;
  18
  19 namespace System.Drawing.Design
  20 {
  21         // LAMESPEC: Why isn't this class inherited from ImageEditor?
  22         public class IconEditor : UITypeEditor
  23         {
  24
  25                 private OpenFileDialog openDialog;
  26
  27                 public IconEditor()
  28                 {
  29                 }
  30
  31                 protected static string CreateExtensionsString (string[] extensions, string sep)
  32                 {
  33                         if (extensions.Length > 0) {
  34                                 StringBuilder sb = new StringBuilder();
  35
  36                                 sb.Append (extensions[0]);
  37                                 for (int x = 1; x < extensions.Length - 1; x++) {
  38                                         sb.Append (sep);
  39                                         sb.Append (extensions[x]);
  40                                 }
  41                                 return sb.ToString();
  42                         }
  43                         else {
  44                                 return string.Empty;
  45                         }
  46                 }
  47
  48                 protected static string CreateFilterEntry (IconEditor e)
  49                 {
  50                         StringBuilder sb = new StringBuilder();
  51                         string ExtStr = CreateExtensionsString (e.GetExtensions(), ";");
  52
  53                         sb.Append (e.GetFileDialogDescription());
  54                         sb.Append (" (" + ExtStr + ")" + "|");
  55                         sb.Append (ExtStr);
  56                         return sb.ToString();
  57                 }
  58
  59                 public override object EditValue (ITypeDescriptorContext context,
  60                         IServiceProvider provider, object value)
  61                 {
  62                         openDialog = new OpenFileDialog();
  63                         openDialog.Title = Locale.GetText ("Open image file");
  64                         openDialog.CheckFileExists = true;
  65                         openDialog.CheckPathExists = true;
  66                         openDialog.Filter = CreateFilterEntry (this);
  67                         openDialog.Multiselect = false;
  68
  69                         // Show the dialog
  70                         DialogResult result = openDialog.ShowDialog();
  71
  72                         // Check the result and create a new image from the file
  73                         if (result == DialogResult.OK)
  74                         {
  75                                 return LoadFromStream (openDialog.OpenFile());
  76                         }
  77                         else
  78                                 return value;
  79                 }
  80
  81                 public override UITypeEditorEditStyle GetEditStyle (ITypeDescriptorContext context)
  82                 {
  83                         return UITypeEditorEditStyle.Modal;
  84                 }
  85
  86                 protected virtual string[] GetExtensions()
  87                 {
  88                         return new string[] {"*.ico"};
  89                 }
  90
  91                 protected virtual string GetFileDialogDescription()
  92                 {
  93                         return Locale.GetText ("Icon files");
  94                 }
  95
  96                 public override bool GetPaintValueSupported (ITypeDescriptorContext context)
  97                 {
  98                         return true;
  99                 }
 100
 101                 protected virtual Icon LoadFromStream (Stream stream)
 102                 {
 103                         return new Icon (stream);
 104                 }
 105
 106                 public override void PaintValue (PaintValueEventArgs e)
 107                 {
 108                         Graphics G = e.Graphics;
 109
 110                         if (e.Value != null) {
 111                                 Image I = (Image) e.Value;
 112                                 G.DrawImage (I, e.Bounds);
 113                         }
 114
 115                         G.DrawRectangle (Pens.Black, e.Bounds);
 116                 }
 117         }
 118 }