X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.ui%2Fsrc%2Forg%2Fsimantics%2Fui%2Fworkbench%2Fhandler%2Fe4%2FSessionUndoHandler.java;fp=bundles%2Forg.simantics.ui%2Fsrc%2Forg%2Fsimantics%2Fui%2Fworkbench%2Fhandler%2Fe4%2FSessionUndoHandler.java;h=dd931e77ee3a503128abe673de6a6b686f2f7313;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.ui/src/org/simantics/ui/workbench/handler/e4/SessionUndoHandler.java b/bundles/org.simantics.ui/src/org/simantics/ui/workbench/handler/e4/SessionUndoHandler.java
new file mode 100644
index 000000000..dd931e77e
--- /dev/null
+++ b/bundles/org.simantics.ui/src/org/simantics/ui/workbench/handler/e4/SessionUndoHandler.java
@@ -0,0 +1,162 @@
+/*******************************************************************************
+ * Copyright (c) 2007- VTT Technical Research Centre of Finland.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.ui.workbench.handler.e4;
+
+import java.lang.reflect.InvocationTargetException;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicReference;
+
+import org.eclipse.core.commands.Command;
+import org.eclipse.core.commands.ExecutionException;
+import org.eclipse.core.commands.State;
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.e4.core.contexts.Active;
+import org.eclipse.e4.core.di.annotations.CanExecute;
+import org.eclipse.e4.core.di.annotations.Execute;
+import org.eclipse.e4.ui.model.application.MApplication;
+import org.eclipse.e4.ui.model.application.ui.basic.MPart;
+import org.eclipse.e4.ui.workbench.modeling.EModelService;
+import org.eclipse.jface.action.IStatusLineManager;
+import org.eclipse.jface.dialogs.ProgressMonitorDialog;
+import org.eclipse.jface.operation.IRunnableWithProgress;
+import org.eclipse.swt.widgets.Shell;
+import org.eclipse.ui.IWorkbenchPart;
+import org.eclipse.ui.PlatformUI;
+import org.eclipse.ui.commands.ICommandService;
+import org.simantics.Simantics;
+import org.simantics.db.ChangeSetIdentifier;
+import org.simantics.db.Operation;
+import org.simantics.db.Session;
+import org.simantics.db.common.CommentMetadata;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.exception.NoHistoryException;
+import org.simantics.db.service.ManagementSupport;
+import org.simantics.db.service.UndoRedoSupport;
+import org.simantics.ui.states.TrackedTextState;
+import org.simantics.utils.ui.ErrorLogger;
+import org.simantics.utils.ui.workbench.WorkbenchUtils;
+
+/**
+ * @author Kalle Kondelin
+ * @author Jani Simomaa
+ */
+public class SessionUndoHandler {
+    
+    private final static boolean DEBUG = false;
+    private final static boolean ENABLED = true;
+    
+    @CanExecute
+    public boolean canExecute() {
+        return UndoRedoTester.canUndo();
+    }
+    
+    @Execute
+    public void execute(@Active MPart activePart, MApplication mApplication, EModelService modelService) throws ExecutionException {
+        if (DEBUG)
+            System.out.println("--\nUndo handler called.");
+
+        if (activePart == null)
+            return;
+        final Session session = Simantics.peekSession();
+        if (session == null)
+            return;
+        
+        ICommandService service = (ICommandService) PlatformUI.getWorkbench().getService(ICommandService.class);
+        Command command = service.getCommand( TrackedTextState.COMMAND_ID );
+        State state = command.getState( TrackedTextState.STATE_ID );
+        
+        boolean sessionUndoEnabled = true;
+        Object value = state.getValue();
+        if (value != null && value instanceof Boolean)
+            sessionUndoEnabled = (Boolean) value;
+        
+        if (ENABLED) {
+            if (sessionUndoEnabled) {
+                try {
+                    final AtomicReference<String> msg = new AtomicReference<String>();
+                    IRunnableWithProgress undo = new IRunnableWithProgress() {
+                        @Override
+                        public void run(IProgressMonitor monitor) throws InvocationTargetException, InterruptedException {
+                            try {
+                                monitor.beginTask("Undo", IProgressMonitor.UNKNOWN);
+                                msg.set( undo( session ) );
+                            } catch (NoHistoryException e) {
+                                msg.set("Nothing to undo.");
+                            } catch (DatabaseException e) {
+                                throw new InvocationTargetException(e);
+                            } finally {
+                                monitor.done();
+                            }
+                        }
+                    };
+    
+                    // busyCursorWhile does not work because locking the session for undo
+                    // will also lock the UI completely.
+                    //PlatformUI.getWorkbench().getProgressService().busyCursorWhile(undo);
+                    Shell shell = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell();
+                    new ProgressMonitorDialog(shell).run(true, false, undo);
+                    
+                    //
+                    // TODO Not the Eclipse 4 way of using IStatusLineManager!
+                    // See:
+                    // https://bugs.eclipse.org/bugs/show_bug.cgi?id=332499
+                    // https://www.eclipse.org/forums/index.php?t=msg&th=367379&goto=941232&#msg_941232
+                    //
+                    IWorkbenchPart part = WorkbenchUtils.getActiveWorkbenchPart();
+                    IStatusLineManager manager = WorkbenchUtils.getStatusLine(part);
+                    manager.setMessage(msg.get());
+//                    statusManager.setMessage( msg.get() );
+                } catch (InvocationTargetException e1) {
+                    throw new ExecutionException("Undo failed, database failure.", e1);
+                } catch (InterruptedException e1) {
+                    throw new ExecutionException("Undo failed, interrupted.", e1);
+                }
+            }
+        } else {
+            ErrorLogger.getDefault().log(IStatus.INFO, 0, "The undo command is disabled", null);
+        }
+        return;
+    }
+
+    public static String getComment(Session session, ChangeSetIdentifier id) {
+        byte[] data = id.getMetadata().get(CommentMetadata.class.getName());
+        if(data == null)
+            return "Undescribed operation.";
+        String comment = CommentMetadata.deserialise(session, data).toString().trim();
+        if(comment.isEmpty())
+            return "Undescribed operation.";
+        return comment;
+    }
+    
+    private String undo(Session session) throws DatabaseException {
+        UndoRedoSupport support = session.getService(UndoRedoSupport.class);
+        
+        List<Operation> ops = support.undoAndReturnOperations(session, 1);
+        if(ops.isEmpty())
+            return "Undo history is empty.";        
+        
+        Operation mainOperation = ops.get(0);
+        
+        String msg = null;
+        long csId = mainOperation.getCSId();
+
+        ManagementSupport management = session.getService(ManagementSupport.class);
+        for(ChangeSetIdentifier id : management.getChangeSetIdentifiers(csId, csId))
+            if(msg == null)
+                msg = "Undo reverted: " + getComment(session, id);
+
+        if (DEBUG)
+            System.out.println(msg);
+        return msg;
+    }
+
+}