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

   1 //
   2 // System.Drawing.Design.ImageEditor.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 using System;
  12 using System.IO;
  13 using System.Drawing;
  14 using System.ComponentModel;
  15 using System.Windows.Forms;
  16
  17 namespace System.Drawing.Design
  18 {
  19         public class ImageEditor : UITypeEditor
  20         {
  21
  22                 private OpenFileDialog openDialog;
  23
  24                 public ImageEditor()
  25                 {
  26                 }
  27
  28                 public override object EditValue (ITypeDescriptorContext context,
  29                         IServiceProvider provider, object value)
  30                 {
  31                         openDialog = new OpenFileDialog();
  32                         // FIXME: Add multilanguage support
  33                         openDialog.Title = "Open image file";
  34                         openDialog.CheckFileExists = true;
  35                         openDialog.CheckPathExists = true;
  36                         openDialog.Filter = CreateFilterEntry (this);
  37                         openDialog.Multiselect = false;
  38
  39                         // Show the dialog
  40                         DialogResult result = openDialog.ShowDialog();
  41
  42                         // Check the result and create a new image from the file
  43                         if (result == DialogResult.OK)
  44                         {
  45                                 return LoadFromStream (openDialog.OpenFile());
  46                         }
  47                         else
  48                                 return value;
  49                 }
  50
  51                 public override UITypeEditorEditStyle GetEditStyle (ITypeDescriptorContext context)
  52                 {
  53                         return UITypeEditorEditStyle.Modal;
  54                 }
  55
  56                 public override bool GetPaintValueSupported (ITypeDescriptorContext context)
  57                 {
  58                         return true;
  59                 }
  60
  61                 public override void PaintValue (PaintValueEventArgs e)
  62                 {
  63                         Graphics G = e.Graphics;
  64                         if (e.Value != null)
  65                         {
  66                                 Image I = (Image) e.Value;
  67                                 G.DrawImage (I, e.Bounds);
  68                         }
  69                         G.DrawRectangle (Pens.Black, e.Bounds);
  70                 }
  71
  72                 protected static string CreateExtensionsString (string[] extensions, string sep)
  73                 {
  74                         if (extensions.Length > 0)
  75                         {
  76                                 string Ext = extensions[0];
  77                                 for (int x = 1; x < extensions.Length - 1; x++)
  78                                         Ext = string.Concat(Ext, sep, extensions[x]);
  79                                 return Ext;
  80                         }
  81                         else
  82                         {
  83                                 return string.Empty;
  84                         }
  85                 }
  86
  87                 protected static string CreateFilterEntry (ImageEditor e)
  88                 {
  89                         string ExtStr = CreateExtensionsString (e.GetExtensions(), ";");
  90                         string Desc = e.GetFileDialogDescription() + " (" + ExtStr + ")";
  91                         return String.Concat (Desc, "|", ExtStr);
  92                 }
  93
  94                 protected virtual string[] GetExtensions()
  95                 {
  96                         return new string[] {"*.bmp", "*.gif", "*.jpg", "*.jpeg", "*.png", "*.ico", "*.emf", "*.wmf"};
  97                 }
  98
  99                 protected virtual string GetFileDialogDescription()
 100                 {
 101                         // FIXME: Add multilanguage support
 102                         return "All image files";
 103                 }
 104
 105                 protected virtual Image LoadFromStream (Stream stream)
 106                 {
 107                         return new Bitmap (stream);
 108                 }
 109         }
 110 }