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Groovy Swing Explorer File Drop Handler

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  1. import java.awt.datatransfer.*;
  2. import java.awt.dnd.*;
  3.  
  4. public class TFileDropHandler
  5. {	
  6. 	// TFileDropHandler.groovy
  7. 	// Laurence Toenjes - 2010-08-18
  8. 	// Based on 1999 example from Cay Horstmann found at
  9. 	// http://java.itags.org/java-core-gui-apis/33457/
  10.  
  11. 	// dropped files closure example: { files -> println files };
  12. 	def TFileDropHandler( aSwingControl, Closure a_onDroppedFiles )
  13. 	{   // ctor
  14. 		def dropTarget = new DropTarget( aSwingControl, new TFileDropTargetListener( a_onDroppedFiles ) )
  15. 		aSwingControl.setDropTarget( dropTarget )
  16. 	}
  17.  
  18. 	// --------------------------------------------------------
  19. 	class TFileDropTargetListener implements DropTargetListener 
  20. 	{
  21. 		def Closure onDroppedFiles =  null // our callback event
  22. 		public TFileDropTargetListener( a_onDroppedFiles ) { // ctor
  23. 					 onDroppedFiles = a_onDroppedFiles }
  24.  
  25. 		public void dragEnter(DropTargetDragEvent event) {}	
  26. 		public void dragExit(DropTargetEvent event) {}
  27. 		public void dropActionChanged(DropTargetDragEvent event) {}
  28. 		public void dragOver(DropTargetDragEvent event) {
  29. 			// provide visual feedback
  30. 			event.acceptDrag(DnDConstants.ACTION_COPY);
  31. 		}
  32.  
  33. 		public void drop(DropTargetDropEvent event) {
  34. 			if ( (event.getSourceActions() & DnDConstants.ACTION_COPY) != 0 ) {
  35. 				event.acceptDrop(DnDConstants.ACTION_COPY);
  36. 			}
  37. 			else {
  38. 				event.rejectDrop();
  39. 				return; // !!!!!!!!!!!!!!!!!!!!!
  40. 			}
  41. 			Transferable transferable = event.getTransferable();
  42. 			DataFlavor[] flavors = event.getCurrentDataFlavors();
  43. 			for (int i = 0; i < flavors.length; i++) {
  44. 				DataFlavor dataFlavor = flavors[i];
  45. 				try {
  46. 					// file flavor
  47. 					if ( dataFlavor.equals( DataFlavor.javaFileListFlavor ) ) {
  48. 						java.util.List fileList = (java.util.List) transferable.getTransferData(dataFlavor);					
  49. 						def files = []	
  50. 						fileList.each { files << it }
  51. 						this?.onDroppedFiles( files )
  52. 						event.dropComplete(true);
  53. 						return;
  54. 					}	
  55. 				} 
  56. 				catch(Exception e) {
  57. 						event.dropComplete(false);
  58. 						return;
  59. 					}
  60. 			} // end for
  61. 			event.dropComplete(false);		
  62. 		} // end drop
  63. 	}
  64. 	// --------------------------------------------------------
  65.  
  66. 	public static void main(String[] args) {
  67. 		// simple example
  68. 		def f = new javax.swing.JFrame()
  69. 		f.setDefaultCloseOperation( javax.swing.JFrame.EXIT_ON_CLOSE )
  70. 		f.size = [400,300]
  71. 		def ta = new javax.swing.JTextArea()
  72. 		f.add( ta )
  73.  
  74. 		new TFileDropHandler( ta,  { files -> 
  75. 			files.each { 
  76. 				ta.append("${it}\n")
  77. 				println it
  78. 			} 
  79. 		} )
  80.  
  81. 		f.show()
  82. 	}
  83. }

URL: http://java.itags.org/java-core-gui-apis/33457/

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