hook up cancel button

core/src/main/groovy/com/muwire/core/download/Downloader.groovy

@@ -27,6 +27,8 @@ public class Downloader {
     private Endpoint endpoint
     private volatile DownloadSession currentSession
     private volatile DownloadState currentState
+    private volatile boolean cancelled
+    private volatile Thread downloadThread
     
     public Downloader(File file, long length, InfoHash infoHash, int pieceSizePow2, I2PConnector connector, Destination destination) {
         this.file = file
@@ -48,6 +50,7 @@ public class Downloader {
     }
     
     void download() {
+        downloadThread = Thread.currentThread()
         Endpoint endpoint = null
         try {
             endpoint = connector.connect(destination)
@@ -59,7 +62,9 @@ public class Downloader {
             currentState = DownloadState.FINISHED
         } catch (Exception bad) {
             log.log(Level.WARNING,"Exception while downloading",bad)
-            if (currentState != DownloadState.FINISHED)
+            if (cancelled)
+                currentState = DownloadState.CANCELLED
+            else if (currentState != DownloadState.FINISHED)
                 currentState = DownloadState.FAILED
         } finally {
             endpoint?.close()
@@ -79,4 +84,9 @@ public class Downloader {
     public DownloadState getCurrentState() {
         currentState
     }
+    
+    public void cancel() {
+        cancelled = true
+        downloadThread?.interrupt()
+    }
 }

gui/griffon-app/controllers/com/muwire/gui/MainFrameController.groovy

@@ -54,6 +54,11 @@ class MainFrameController {
         group.model.results[row]        
     }
     
+    private def selectedDownload() {
+        def selected = builder.getVariable("downloads-table").getSelectedRow()
+        model.downloads[selected].downloader
+    }
+    
     @ControllerAction
     void download() {
         def result = selectedResult()
@@ -79,6 +84,12 @@ class MainFrameController {
         core.eventBus.publish( new TrustEvent(destination : result.sender.destination, level : TrustLevel.DISTRUSTED))
     }
     
+    @ControllerAction 
+    void cancel() {
+        def downloader = selectedDownload()
+        downloader.cancel()
+    }
+    
     void mvcGroupInit(Map<String, String> args) {
         application.addPropertyChangeListener("core", {e-> 
             core = e.getNewValue()

gui/griffon-app/views/com/muwire/gui/MainFrameView.groovy

@@ -98,7 +98,7 @@ class MainFrameView {
                                     }
                                 }
                                 panel (constraints : BorderLayout.SOUTH) {
-                                    button("Cancel", enabled : bind {model.cancelButtonEnabled } )
+                                    button(text: "Cancel", enabled : bind {model.cancelButtonEnabled }, cancelAction )
                                     button("Retry", enabled : bind {model.retryButtonEnabled})
                                 }
                             }