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 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System;
  34 using System.Text;
  35 using System.IO;
  36 using System.Drawing;
  37 using System.ComponentModel;
  38 using System.Windows.Forms;
  39
  40 namespace System.Drawing.Design
  41 {
  42         // LAMESPEC: Why isn't this class inherited from ImageEditor?
  43         public class IconEditor : UITypeEditor
  44         {
  45
  46                 private OpenFileDialog openDialog;
  47
  48                 public IconEditor()
  49                 {
  50                 }
  51
  52                 protected static string CreateExtensionsString (string[] extensions, string sep)
  53                 {
  54                         if (extensions.Length > 0) {
  55                                 StringBuilder sb = new StringBuilder();
  56
  57                                 sb.Append (extensions[0]);
  58                                 for (int x = 1; x < extensions.Length - 1; x++) {
  59                                         sb.Append (sep);
  60                                         sb.Append (extensions[x]);
  61                                 }
  62                                 return sb.ToString();
  63                         }
  64                         else {
  65                                 return string.Empty;
  66                         }
  67                 }
  68
  69                 protected static string CreateFilterEntry (IconEditor e)
  70                 {
  71                         StringBuilder sb = new StringBuilder();
  72                         string ExtStr = CreateExtensionsString (e.GetExtensions(), ";");
  73
  74                         sb.Append (e.GetFileDialogDescription());
  75                         sb.Append (" (" + ExtStr + ")" + "|");
  76                         sb.Append (ExtStr);
  77                         return sb.ToString();
  78                 }
  79
  80                 public override object EditValue (ITypeDescriptorContext context,
  81                         IServiceProvider provider, object value)
  82                 {
  83                         openDialog = new OpenFileDialog();
  84                         openDialog.Title = Locale.GetText ("Open image file");
  85                         openDialog.CheckFileExists = true;
  86                         openDialog.CheckPathExists = true;
  87                         openDialog.Filter = CreateFilterEntry (this);
  88                         openDialog.Multiselect = false;
  89
  90                         // Show the dialog
  91                         DialogResult result = openDialog.ShowDialog();
  92
  93                         // Check the result and create a new image from the file
  94                         if (result == DialogResult.OK)
  95                         {
  96                                 return LoadFromStream (openDialog.OpenFile());
  97                         }
  98                         else
  99                                 return value;
 100                 }
 101
 102                 public override UITypeEditorEditStyle GetEditStyle (ITypeDescriptorContext context)
 103                 {
 104                         return UITypeEditorEditStyle.Modal;
 105                 }
 106
 107                 protected virtual string[] GetExtensions()
 108                 {
 109                         return new string[] {"*.ico"};
 110                 }
 111
 112                 protected virtual string GetFileDialogDescription()
 113                 {
 114                         return Locale.GetText ("Icon files");
 115                 }
 116
 117                 public override bool GetPaintValueSupported (ITypeDescriptorContext context)
 118                 {
 119                         return true;
 120                 }
 121
 122                 protected virtual Icon LoadFromStream (Stream stream)
 123                 {
 124                         return new Icon (stream);
 125                 }
 126
 127                 public override void PaintValue (PaintValueEventArgs e)
 128                 {
 129                         Graphics G = e.Graphics;
 130
 131                         if (e.Value != null) {
 132                                 Icon i = (Icon) e.Value;
 133                                 Image img = i.ToBitmap ();
 134                                 G.DrawImage (img, e.Bounds);
 135                                 img.Dispose ();
 136                         }
 137
 138                         G.DrawRectangle (Pens.Black, e.Bounds);
 139                 }
 140         }
 141 }