OpenTween/OTPictureBox.cs

   1 // OpenTween - Client of Twitter
   2 // Copyright (c) 2013 kim_upsilon (@kim_upsilon) <https://upsilo.net/~upsilon/>
   3 // All rights reserved.
   4 //
   5 // This file is part of OpenTween.
   6 //
   7 // This program is free software; you can redistribute it and/or modify it
   8 // under the terms of the GNU General Public License as published by the Free
   9 // Software Foundation; either version 3 of the License, or (at your option)
  10 // any later version.
  11 //
  12 // This program is distributed in the hope that it will be useful, but
  13 // WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14 // or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  15 // for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License along
  18 // with this program. If not, see <http://www.gnu.org/licenses/>, or write to
  19 // the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
  20 // Boston, MA 02110-1301, USA.
  21
  22 using System;
  23 using System.Collections.Generic;
  24 using System.Linq;
  25 using System.Runtime.InteropServices;
  26 using System.Text;
  27 using System.Windows.Forms;
  28 using System.ComponentModel;
  29 using System.Drawing;
  30 using System.Threading.Tasks;
  31 using System.Threading;
  32 using System.Net;
  33 using System.Net.Http;
  34 using System.IO;
  35
  36 namespace OpenTween
  37 {
  38     public class OTPictureBox : PictureBox
  39     {
  40         [Browsable(false)]
  41         [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
  42         public new MemoryImage Image
  43         {
  44             get { return this.memoryImage; }
  45             set
  46             {
  47                 this.memoryImage = value;
  48                 base.Image = value != null ? value.Image : null;
  49
  50                 this.RestoreSizeMode();
  51             }
  52         }
  53         private MemoryImage memoryImage;
  54
  55         [Localizable(true)]
  56         [DefaultValue(PictureBoxSizeMode.Normal)]
  57         public new PictureBoxSizeMode SizeMode
  58         {
  59             get { return this.currentSizeMode; }
  60             set
  61             {
  62                 this.currentSizeMode = value;
  63
  64                 if (base.Image != base.InitialImage && base.Image != base.ErrorImage)
  65                 {
  66                     base.SizeMode = value;
  67                 }
  68             }
  69         }
  70
  71         /// <summary>
  72         /// InitialImage や ErrorImage の表示に SizeMode を一時的に変更するため、
  73         /// 現在の SizeMode を記憶しておくためのフィールド
  74         /// </summary>
  75         private PictureBoxSizeMode currentSizeMode;
  76
  77         public void ShowInitialImage()
  78         {
  79             base.Image = base.InitialImage;
  80
  81             // InitialImage は SizeMode の値に依らず中央等倍に表示する必要がある
  82             base.SizeMode = PictureBoxSizeMode.CenterImage;
  83         }
  84
  85         public void ShowErrorImage()
  86         {
  87             base.Image = base.ErrorImage;
  88
  89             // ErrorImage は SizeMode の値に依らず中央等倍に表示する必要がある
  90             base.SizeMode = PictureBoxSizeMode.CenterImage;
  91         }
  92
  93         private void RestoreSizeMode()
  94         {
  95             base.SizeMode = this.currentSizeMode;
  96         }
  97
  98         public async Task SetImageFromTask(Func<Task<MemoryImage>> imageTask)
  99         {
 100             try
 101             {
 102                 this.ShowInitialImage();
 103                 this.Image = await imageTask();
 104             }
 105             catch (Exception)
 106             {
 107                 this.ShowErrorImage();
 108                 try
 109                 {
 110                     throw;
 111                 }
 112                 catch (HttpRequestException) { }
 113                 catch (InvalidImageException) { }
 114                 catch (TaskCanceledException) { }
 115                 catch (WebException) { }
 116             }
 117         }
 118
 119         protected override void OnPaint(PaintEventArgs pe)
 120         {
 121             try
 122             {
 123                 base.OnPaint(pe);
 124             }
 125             catch (ExternalException)
 126             {
 127                 // アニメーション GIF 再生中に発生するエラーの対策
 128                 // 参照: https://sourceforge.jp/ticket/browse.php?group_id=6526&tid=32894
 129                 this.ShowErrorImage();
 130             }
 131         }
 132
 133         [Browsable(false)]
 134         [EditorBrowsable(EditorBrowsableState.Never)]
 135         [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
 136         public new string ImageLocation
 137         {
 138             get { throw new NotSupportedException(); }
 139             set { throw new NotSupportedException(); }
 140         }
 141
 142         [EditorBrowsable(EditorBrowsableState.Never)]
 143         public new void Load(string url)
 144         {
 145             throw new NotSupportedException();
 146         }
 147     }
 148 }