src/charactermanaj/ui/util/FileDropTarget.java

   1 package charactermanaj.ui.util;\r
   2 \r
   3 import java.awt.datatransfer.DataFlavor;\r
   4 import java.awt.datatransfer.UnsupportedFlavorException;\r
   5 import java.awt.dnd.DnDConstants;\r
   6 import java.awt.dnd.DropTargetAdapter;\r
   7 import java.awt.dnd.DropTargetDropEvent;\r
   8 import java.io.File;\r
   9 import java.io.IOException;\r
  10 import java.net.URI;\r
  11 import java.net.URISyntaxException;\r
  12 import java.util.ArrayList;\r
  13 import java.util.Iterator;\r
  14 import java.util.List;\r
  15 import java.util.logging.Level;\r
  16 import java.util.logging.Logger;\r
  17 \r
  18 /**\r
  19  * ファイルドロップターゲット.<br>\r
  20  * Windows/Macと、Linuxの両方のデスクトップのドロップをサポートする.\r
  21  * @author seraphy\r
  22  */\r
  23 public class FileDropTarget extends DropTargetAdapter {\r
  24 \r
  25         /**\r
  26          * ロガー\r
  27          */\r
  28         private final Logger logger = Logger.getLogger(getClass().getName());\r
  29         \r
  30         protected FileDropListener fileDropListener;\r
  31 \r
  32         public FileDropTarget() {\r
  33                 this(null);\r
  34         }\r
  35         \r
  36         public FileDropTarget(FileDropListener fileDropListener) {\r
  37                 this.fileDropListener = fileDropListener;\r
  38         }\r
  39         \r
  40         public FileDropListener getFileDropListener() {\r
  41                 return fileDropListener;\r
  42         }\r
  43         \r
  44         public void setFileDropListener(FileDropListener fileDropListener) {\r
  45                 this.fileDropListener = fileDropListener;\r
  46         }\r
  47         \r
  48         protected void onDropFiles(List<File> dropFiles) {\r
  49                 if (fileDropListener != null) {\r
  50                         if ( !dropFiles.isEmpty()) {\r
  51                                 fileDropListener.onDropFiles(dropFiles);\r
  52                         }\r
  53                 }\r
  54         }\r
  55         \r
  56         public void drop(DropTargetDropEvent dtde) {\r
  57                 try {\r
  58                         // urlListFlavor (RFC 2483 for the text/uri-list format)\r
  59                         DataFlavor uriListFlavor;\r
  60                         try {\r
  61                                 uriListFlavor = new DataFlavor("text/uri-list;class=java.lang.String");\r
  62                         } catch (ClassNotFoundException ex) {\r
  63                                 logger.log(Level.WARNING, "urlListFlavor is not supported.", ex);\r
  64                                 uriListFlavor = null;\r
  65                         }\r
  66 \r
  67                         final List<File> dropFiles = new ArrayList<File>();\r
  68                         // ドロップされたものが1つのファイルであれば受け入れる。\r
  69                         for (DataFlavor flavor : dtde.getCurrentDataFlavors()) {\r
  70                                 logger.log(Level.FINE, "flavor: " + flavor);\r
  71                                 \r
  72                                 if (DataFlavor.javaFileListFlavor.equals(flavor)) {\r
  73                                         dtde.acceptDrop(DnDConstants.ACTION_COPY);\r
  74                                         @SuppressWarnings({ "unchecked", "rawtypes" })\r
  75                                         List<File> files = (List) dtde.getTransferable().getTransferData(DataFlavor.javaFileListFlavor);\r
  76                                         logger.log(Level.FINER, "DragAndDrop files(javaFileListFlavor)=" + files);\r
  77                                         dropFiles.addAll(files);\r
  78                                         break;\r
  79                                 }\r
  80                                 if (uriListFlavor != null && uriListFlavor.equals(flavor)) {\r
  81                                         // LinuxではjavaFileListFlavorではなく、text/uri-listタイプで送信される.\r
  82                                         dtde.acceptDrop(DnDConstants.ACTION_COPY);\r
  83                                         String uriList = (String) dtde.getTransferable().getTransferData(uriListFlavor);\r
  84                                         logger.log(Level.FINER, "DragAndDrop files(text/uri-list)=" + uriList);\r
  85                                         for (String fileStr : uriList.split("\r\n")) { // RFC2483によると改行コードはCRLF\r
  86                                                 fileStr = fileStr.trim();\r
  87                                                 if (fileStr.startsWith("#")) {\r
  88                                                         continue;\r
  89                                                 }\r
  90                                                 try {\r
  91                                                         URI uri = new URI(fileStr);\r
  92                                                         File dropFile = new File(uri);\r
  93                                                         dropFiles.add(dropFile);\r
  94                                                         break;\r
  95                                                         \r
  96                                                 } catch (URISyntaxException ex) {\r
  97                                                         logger.log(Level.WARNING, "invalid drop file: " + fileStr, ex);\r
  98                                                 }\r
  99                                         }\r
 100                                 }\r
 101                         }\r
 102                         \r
 103                         // 存在しないファイルを除去する.\r
 104                         for (Iterator<File> ite = dropFiles.iterator(); ite.hasNext();) {\r
 105                                 File dropFile = ite.next();\r
 106                                 if (dropFile == null || !dropFile.exists()) {\r
 107                                         ite.remove();\r
 108                                 }\r
 109                         }\r
 110 \r
 111                         // ドロップされたファイルを通知する.\r
 112                         onDropFiles(dropFiles);\r
 113                         \r
 114                 } catch (UnsupportedFlavorException ex) {\r
 115                         logger.log(Level.WARNING, "unsipported flovaor." , ex);\r
 116                         onException(ex);\r
 117 \r
 118                 } catch (IOException ex) {\r
 119                         logger.log(Level.WARNING, "drop target failed." , ex);\r
 120                         onException(ex);\r
 121                 }\r
 122         }\r
 123         \r
 124         protected void onException(Exception ex) {\r
 125                 // do nothing.\r
 126         }\r
 127 }\r