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
  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         public class ImageEditor : UITypeEditor
  43         {
  44
  45                 private OpenFileDialog openDialog;
  46
  47                 public ImageEditor()
  48                 {
  49                 }
  50
  51                 public override object EditValue (ITypeDescriptorContext context,
  52                         IServiceProvider provider, object value)
  53                 {
  54                         openDialog = new OpenFileDialog();
  55                         openDialog.Title = Locale.GetText ("Open image file");
  56                         openDialog.CheckFileExists = true;
  57                         openDialog.CheckPathExists = true;
  58                         openDialog.Filter = CreateFilterEntry (this);
  59                         openDialog.Multiselect = false;
  60
  61                         // Show the dialog
  62                         DialogResult result = openDialog.ShowDialog();
  63
  64                         // Check the result and create a new image from the file
  65                         if (result == DialogResult.OK) {
  66                                 return LoadFromStream (openDialog.OpenFile());
  67                         }
  68                         else
  69                                 return value;
  70                 }
  71
  72                 public override UITypeEditorEditStyle GetEditStyle (ITypeDescriptorContext context)
  73                 {
  74                         return UITypeEditorEditStyle.Modal;
  75                 }
  76
  77                 public override bool GetPaintValueSupported (ITypeDescriptorContext context)
  78                 {
  79                         return true;
  80                 }
  81
  82                 public override void PaintValue (PaintValueEventArgs e)
  83                 {
  84                         Graphics G = e.Graphics;
  85
  86                         if (e.Value != null) {
  87                                 Image I = (Image) e.Value;
  88                                 G.DrawImage (I, e.Bounds);
  89                         }
  90
  91                         G.DrawRectangle (Pens.Black, e.Bounds);
  92                 }
  93
  94                 protected static string CreateExtensionsString (string[] extensions, string sep)
  95                 {
  96                         if (extensions.Length > 0) {
  97                                 StringBuilder sb = new StringBuilder();
  98
  99                                 sb.Append (extensions[0]);
 100                                 for (int x = 1; x < extensions.Length - 1; x++) {
 101                                         sb.Append (sep);
 102                                         sb.Append (extensions[x]);
 103                                 }
 104                                 return sb.ToString();
 105                         }
 106                         else {
 107                                 return string.Empty;
 108                         }
 109                 }
 110
 111                 protected static string CreateFilterEntry (ImageEditor e)
 112                 {
 113                         StringBuilder sb = new StringBuilder();
 114                         string ExtStr = CreateExtensionsString (e.GetExtensions(), ";");
 115
 116                         sb.Append (e.GetFileDialogDescription());
 117                         sb.Append (" (" + ExtStr + ")" + "|");
 118                         sb.Append (ExtStr);
 119                         return sb.ToString();
 120                 }
 121
 122                 protected virtual string[] GetExtensions()
 123                 {
 124                         return new string[] {"*.bmp", "*.gif", "*.jpg", "*.jpeg", "*.png", "*.ico", "*.emf", "*.wmf"};
 125                 }
 126
 127                 protected virtual string GetFileDialogDescription()
 128                 {
 129                         return Locale.GetText ("All image files");
 130                 }
 131
 132                 protected virtual Image LoadFromStream (Stream stream)
 133                 {
 134                         return new Bitmap (stream);
 135                 }
 136         }
 137 }