midi play command file selection

The play command checks the currently activated view/editor and its
selection and sets the audio view content accordingly.

Author: nittka

org.eclipse.ui.views.midi/META-INF/MANIFEST.MF

@@ -7,7 +7,8 @@ Bundle-Vendor: Open Source Community
 Require-Bundle: org.eclipse.ui,
  org.eclipse.core.runtime,
  org.eclipse.ui.views.file;bundle-version="0.1.0",
- javax.util;bundle-version="0.0.0"
+ javax.util;bundle-version="0.0.0",
+ org.eclipse.util
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
 Export-Package: org.eclipse.ui.views.midi
 Bundle-Activator: org.eclipse.ui.views.midi.Activator

org.eclipse.ui.views.midi/src/org/eclipse/ui/views/midi/PlayPauseHandler.java

@@ -3,37 +3,113 @@
 import org.eclipse.core.commands.AbstractHandler;
 import org.eclipse.core.commands.ExecutionEvent;
 import org.eclipse.core.commands.ExecutionException;
+import org.eclipse.core.resources.IFile;
+import org.eclipse.jface.viewers.ISelection;
+import org.eclipse.jface.viewers.IStructuredSelection;
+import org.eclipse.ui.IEditorInput;
 import org.eclipse.ui.IViewPart;
+import org.eclipse.ui.IWorkbenchPage;
+import org.eclipse.ui.IWorkbenchPart;
+import org.eclipse.ui.PartInitException;
+import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.handlers.HandlerUtil;
+import org.eclipse.ui.part.EditorPart;
 import org.eclipse.ui.views.file.FileView;
 import org.eclipse.ui.views.file.IFileViewType;
+import org.eclipse.util.ResourceUtils;
 
 public class PlayPauseHandler extends AbstractHandler {
 
 	private static final String PARAMETER_VIEW = "org.eclipse.ui.views.midi.commands.PlayPause.view"; //$NON-NLS-1$ //XXX see plugin.xml
 
 	@Override
 	public Object execute(ExecutionEvent event) throws ExecutionException {
+		IWorkbenchPart activePart = HandlerUtil.getActivePart(event);
+		FileView midiView = getMidiFileView(activePart);
 		String viewId = event.getParameter(PARAMETER_VIEW);
-		if (viewId != null) {
+		IFile file = null;
+		if (midiView == null && viewId != null) {
+			file = getMidiFileForSelection(event);
+			//if midi view not already active find it
 			IViewPart view = HandlerUtil.getActivePart(event).getSite().getPage().findView(viewId);
-			if(view == null) {
-				//TODO open view
+			//if it does not exist, but there is a matching midi file - create the view
+			if (file != null && view == null) {
+				IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
+				try {
+					view = page.showView(viewId);
+				} catch (PartInitException e) {
+					Activator.logError("error creating midi view", e);
+				}
 			}
-			if (view instanceof FileView) {
-				//TODO set the correct file if not open
-				FileView fileView = (FileView)view;
-				IFileViewType<?> fileViewType = fileView.getType();
-				if (fileViewType instanceof MidiViewType) {
-					MidiViewType midiViewType = (MidiViewType)fileViewType;
-					MidiViewPage midiViewPage = midiViewType.getPage();
-					if (midiViewPage != null) {
-						midiViewPage.togglePlayback();
+			midiView = getMidiFileView(view);
+		}
+		togglePlayForGivenFile(midiView, file);
+		return null;
+	}
+
+	private void togglePlayForGivenFile(FileView midiView, IFile fileToPlay) {
+		if (midiView != null) {
+			boolean waitForViewToOpen = false;
+			if (fileToPlay != null) {
+				midiView.show(fileToPlay);
+				waitForViewToOpen = true;
+			}
+			IFileViewType<?> type = midiView.getType();
+			for (int i = 0; i < 3; i++) {
+				MidiViewPage page = ((MidiViewType) type).getPage();
+				if (page != null) {
+					page.togglePlayback();
+					return;
+				} else if (waitForViewToOpen) {
+					//page may be null if view was closed and link toggle is disabled
+					try {
+						Thread.sleep(1000);
+					} catch (InterruptedException e) {
 					}
 				}
 			}
 		}
+	}
+
+	private FileView getMidiFileView(IWorkbenchPart part) {
+		if (part instanceof FileView) {
+			FileView fileView = (FileView) part;
+			IFileViewType<?> fileViewType = fileView.getType();
+			if (fileViewType instanceof MidiViewType) {
+				return fileView;
+			}
+		}
 		return null;
 	}
 
-}
+	private IFile getMidiFileForSelection(ExecutionEvent event) {
+		IFile file = null;
+		IWorkbenchPart part = HandlerUtil.getActivePart(event);
+		if (part instanceof EditorPart) {
+			IEditorInput input = ((EditorPart) part).getEditorInput();
+			file = input.getAdapter(IFile.class);
+		} else if (part instanceof FileView) {
+			file = ((FileView) part).getFile();
+		} else {
+			ISelection selection = part.getSite().getSelectionProvider().getSelection();
+			if (selection instanceof IStructuredSelection) {
+				IStructuredSelection structuredSelection = (IStructuredSelection) selection;
+				if (structuredSelection.size() == 1) {
+					Object firstElement = structuredSelection.getFirstElement();
+					if (firstElement instanceof IFile) {
+						file = (IFile) firstElement;
+					}
+				}
+			}
+		}
+		if (file != null) {
+			if (!MidiViewType.EXTENSION.equals(file.getFileExtension())) {
+				file = ResourceUtils.replaceExtension(file, MidiViewType.EXTENSION);
+			}
+			if (!file.exists()) {
+				file = null;
+			}
+		}
+		return file;
+	}
+}