rcp/org.eclipse.rcptt.ui/src/org/eclipse/rcptt/ui/editors/TextViewerActionsSupport.java - rcptt/org.eclipse.rcptt - Git at Google

 /*******************************************************************************
  * Copyright (c) 2009, 2014 Xored Software Inc and others.
  * 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:
  *     Xored Software Inc - initial API and implementation and/or initial documentation
  *******************************************************************************/
 package org.eclipse.rcptt.ui.editors;

 import java.util.ResourceBundle;

 import org.eclipse.core.commands.ExecutionException;
 import org.eclipse.core.commands.operations.IOperationHistory;
 import org.eclipse.core.commands.operations.IOperationHistoryListener;
 import org.eclipse.core.commands.operations.IUndoContext;
 import org.eclipse.core.commands.operations.OperationHistoryEvent;
 import org.eclipse.core.databinding.DataBindingContext;
 import org.eclipse.core.databinding.observable.ChangeEvent;
 import org.eclipse.core.databinding.observable.IChangeListener;
 import org.eclipse.core.databinding.observable.value.IObservableValue;
 import org.eclipse.jface.action.Action;
 import org.eclipse.jface.action.IMenuListener;
 import org.eclipse.jface.action.IMenuManager;
 import org.eclipse.jface.action.MenuManager;
 import org.eclipse.jface.action.Separator;
 import org.eclipse.jface.bindings.keys.KeyStroke;
 import org.eclipse.jface.bindings.keys.ParseException;
 import org.eclipse.jface.resource.ImageDescriptor;
 import org.eclipse.jface.text.ITextOperationTarget;
 import org.eclipse.jface.text.ITextSelection;
 import org.eclipse.jface.text.ITextViewerExtension6;
 import org.eclipse.jface.text.IUndoManagerExtension;
 import org.eclipse.jface.text.TextViewer;
 import org.eclipse.jface.text.source.ISourceViewer;
 import org.eclipse.jface.viewers.ISelectionChangedListener;
 import org.eclipse.jface.viewers.SelectionChangedEvent;
 import org.eclipse.swt.custom.BusyIndicator;
 import org.eclipse.swt.custom.StyledText;
 import org.eclipse.swt.events.DisposeEvent;
 import org.eclipse.swt.events.DisposeListener;
 import org.eclipse.swt.events.FocusEvent;
 import org.eclipse.swt.events.FocusListener;
 import org.eclipse.swt.events.KeyAdapter;
 import org.eclipse.swt.events.KeyEvent;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.swt.widgets.Menu;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.ui.IActionBars;
 import org.eclipse.ui.IEditorSite;
 import org.eclipse.ui.ISharedImages;
 import org.eclipse.ui.IViewSite;
 import org.eclipse.ui.IWorkbenchCommandConstants;
 import org.eclipse.ui.IWorkbenchPartSite;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.operations.RedoActionHandler;
 import org.eclipse.ui.operations.UndoActionHandler;
 import org.eclipse.ui.texteditor.FindReplaceAction;
 import org.eclipse.ui.texteditor.ITextEditorActionConstants;
 import org.eclipse.ui.texteditor.ITextEditorActionDefinitionIds;
 import org.eclipse.ui.texteditor.ResourceAction;

 import org.eclipse.rcptt.internal.ui.Messages;
 import org.eclipse.rcptt.internal.ui.Q7UIPlugin;
 import org.eclipse.rcptt.ui.actions.GotoScriptLineAction;

 public class TextViewerActionsSupport implements FocusListener, DisposeListener {

 	private final TextViewer textViewer;
 	private final IWorkbenchPartSite partSite;
 	private final Shell shell;
 	private final IObservableValue editable;
 	@SuppressWarnings("unused")
 	private final DataBindingContext dbc = new DataBindingContext();

 	private final static String CutLabel = Messages.TextViewerActionsSupport_CutLabel;
 	private final static String CopyLabel = Messages.TextViewerActionsSupport_CopyLabel;
 	private final static String PasteLabel = Messages.TextViewerActionsSupport_PasteLabel;
 	private final static String DeleteLabel = Messages.TextViewerActionsSupport_DeleteLabel;
 	private final static String SelectAllLabel = Messages.TextViewerActionsSupport_SelectAllLabel;

 	final static String BUNDLE_FOR_CONSTRUCTED_KEYS = "org.eclipse.ui.texteditor.ConstructedEditorMessages";//$NON-NLS-1$

 	private Action undoAction;
 	private Action redoAction;

 	private Action cutAction;
 	private Action copyAction;
 	private Action pasteAction;
 	private Action deleteAction;
 	private Action selectAllAction;

 	private ResourceAction findAction;

 	private Action contentAssistAction;
 	private Action gotoLineAction;

 	public TextViewerActionsSupport(TextViewer textViewer,
 			IWorkbenchPartSite partSite, IObservableValue editable) {
 		this.textViewer = textViewer;
 		this.partSite = partSite;
 		this.shell = partSite.getShell();
 		this.editable = editable;
 		init();
 	}

 	public TextViewerActionsSupport(TextViewer textViewer, Shell shell,
 			IObservableValue editable) {
 		this.textViewer = textViewer;
 		this.partSite = null;
 		this.shell = shell;
 		this.editable = editable;
 		init();
 	}

 	private void init() {
 		addListeners();
 		createActions();
 		if (partSite == null) {
 			setAcceleratorLabel();
 		} else if (getTextWidget() != null && getTextWidget().isFocusControl()) {
 			activateActions();
 		}
 		updateEditActionsEnablement();
 		editable.addChangeListener(new IChangeListener() {
 			public void handleChange(ChangeEvent event) {
 				updateEditActionsEnablement();
 			}
 		});
 		createPopupMenu();
 	}

 	public Action getUndoAction() {
 		return undoAction;
 	}

 	public Action getRedoAction() {
 		return redoAction;
 	}

 	public Action getCutAction() {
 		return cutAction;
 	}

 	public Action getCopyAction() {
 		return copyAction;
 	}

 	public Action getPasteAction() {
 		return pasteAction;
 	}

 	public Action getDeleteAction() {
 		return deleteAction;
 	}

 	public Action getSelectAllAction() {
 		return selectAllAction;
 	}

 	public ResourceAction getFindAction() {
 		return findAction;
 	}

 	public Action getContentAssistAction() {
 		return contentAssistAction;
 	}

 	public Action getGotoLineAction() {
 		return gotoLineAction;
 	}

 	private void addListeners() {
 		if (getTextWidget() != null) {
 			if (partSite != null) {
 				getTextWidget().addFocusListener(this);
 				getTextWidget().addDisposeListener(this);
 			} else {
 				getTextWidget().addKeyListener(new KeyAdapter() {
 					public void keyPressed(KeyEvent event) {
 						try {
 							processKeyDown(event);
 						} catch (ParseException e) {
 							Q7UIPlugin.log(e);
 						}
 					}
 				});
 			}
 		}
 		this.textViewer
 				.addSelectionChangedListener(new ISelectionChangedListener() {
 					public void selectionChanged(SelectionChangedEvent event) {
 						updateEditActionsEnablement();
 					}
 				});
 	}

 	private void processKeyDown(KeyEvent e) throws ParseException {
 		KeyStroke pressed = KeyStroke.getInstance(e.stateMask,
 				Character.toUpperCase(e.keyCode));

 		if (pressed.equals(KeyStroke.getInstance("M1+Z"))) { //$NON-NLS-1$
 			undoAction.run();
 		} else if (pressed.equals(KeyStroke.getInstance("M1+Y"))) { //$NON-NLS-1$
 			redoAction.run();
 		} else if (pressed.equals(KeyStroke.getInstance("M1+A"))) { //$NON-NLS-1$
 			selectAllAction.run();
 		} else if (pressed.equals(KeyStroke.getInstance("M1+F"))) { //$NON-NLS-1$
 			findAction.run();
 		} else if (pressed.equals(KeyStroke.getInstance("Ctrl+Space"))) { //$NON-NLS-1$
 			contentAssistAction.run();
 		} else if (gotoLineAction != null
 				&& pressed.equals(KeyStroke.getInstance("M1+L"))) { //$NON-NLS-1$
 			gotoLineAction.run();
 		}

 	}

 	private void createPopupMenu() {
 		if (getTextWidget() != null) {
 			MenuManager popupMenuManager = new MenuManager();
 			IMenuListener listener = new IMenuListener() {
 				public void menuAboutToShow(IMenuManager mng) {
 					fillContextMenu(mng);
 				}
 			};
 			popupMenuManager.addMenuListener(listener);
 			popupMenuManager.setRemoveAllWhenShown(true);
 			Menu menu = popupMenuManager.createContextMenu(textViewer
 					.getControl());
 			getTextWidget().setMenu(menu);
 		}
 	}

 	private void fillContextMenu(IMenuManager menuManager) {
 		if (undoAction != null)
 			menuManager.add(undoAction);
 		if (redoAction != null)
 			menuManager.add(redoAction);
 		if (undoAction != null || redoAction != null)
 			menuManager.add(new Separator());
 		menuManager.add(cutAction);
 		menuManager.add(copyAction);
 		menuManager.add(pasteAction);
 		menuManager.add(new Separator());
 		menuManager.add(deleteAction);
 		menuManager.add(selectAllAction);
 	}

 	private void updateEditActionsEnablement() {
 		ITextSelection selection = (ITextSelection) textViewer.getSelection();
 		boolean hasSelectedText = !selection.isEmpty()
 				&& selection.getLength() > 0;
 		boolean isEditable = (Boolean) editable.getValue();
 		cutAction.setEnabled(isEditable && hasSelectedText);
 		copyAction.setEnabled(hasSelectedText);
 		pasteAction.setEnabled(isEditable);
 		deleteAction.setEnabled(isEditable && hasSelectedText);
 		if (findAction != null) {
 			findAction.setEnabled(true);
 		}
 	}

 	private void createActions() {
 		createUndoRedoActions();
 		createCommonTextAction();
 		createAdditionalAction();
 	}

 	private void createUndoRedoActions() {
 		if (textViewer instanceof ITextViewerExtension6
 				&& textViewer.getUndoManager() instanceof IUndoManagerExtension) {

 			final IUndoContext undoContext = ((IUndoManagerExtension) textViewer
 					.getUndoManager()).getUndoContext();
 			if (undoContext != null) {

 				if (partSite != null) {
 					undoAction = new UndoActionHandler(partSite, undoContext);
 					redoAction = new RedoActionHandler(partSite, undoContext);
 				} else {
 					undoAction = new CustomUndoAction(undoContext);
 					redoAction = new CustomRedoAction(undoContext);
 				}
 				undoAction
 						.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_UNDO);
 				redoAction
 						.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_REDO);

 				textViewer.getUndoManager().reset();
 			}
 		}
 	}

 	private void createCommonTextAction() {
 		cutAction = new Action(CutLabel) {
 			public void run() {
 				if (textViewer.canDoOperation(ITextOperationTarget.CUT))
 					textViewer.doOperation(ITextOperationTarget.CUT);
 			};
 		};
 		cutAction.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_CUT);
 		cutAction
 				.setImageDescriptor(getImageDescriptor(ISharedImages.IMG_TOOL_CUT));
 		cutAction
 				.setDisabledImageDescriptor(getImageDescriptor(ISharedImages.IMG_TOOL_CUT_DISABLED));

 		copyAction = new Action(CopyLabel) {
 			public void run() {
 				if (textViewer.canDoOperation(ITextOperationTarget.COPY))
 					textViewer.doOperation(ITextOperationTarget.COPY);
 			};
 		};
 		copyAction.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_COPY);
 		copyAction
 				.setImageDescriptor(getImageDescriptor(ISharedImages.IMG_TOOL_COPY));
 		copyAction
 				.setDisabledImageDescriptor(getImageDescriptor(ISharedImages.IMG_TOOL_COPY_DISABLED));

 		pasteAction = new Action(PasteLabel) {
 			public void run() {
 				if (textViewer.canDoOperation(ITextOperationTarget.PASTE))
 					textViewer.doOperation(ITextOperationTarget.PASTE);
 			};
 		};
 		pasteAction
 				.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_PASTE);
 		pasteAction
 				.setImageDescriptor(getImageDescriptor(ISharedImages.IMG_TOOL_PASTE));
 		pasteAction
 				.setDisabledImageDescriptor(getImageDescriptor(ISharedImages.IMG_TOOL_PASTE_DISABLED));

 		deleteAction = new Action(DeleteLabel) {
 			public void run() {
 				if (textViewer.canDoOperation(ITextOperationTarget.DELETE))
 					textViewer.doOperation(ITextOperationTarget.DELETE);
 			};
 		};
 		deleteAction
 				.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_DELETE);
 		deleteAction
 				.setImageDescriptor(getImageDescriptor(ISharedImages.IMG_TOOL_DELETE));
 		deleteAction
 				.setDisabledImageDescriptor(getImageDescriptor(ISharedImages.IMG_TOOL_DELETE_DISABLED));

 		selectAllAction = new Action(SelectAllLabel) {
 			public void run() {
 				if (textViewer.canDoOperation(ITextOperationTarget.SELECT_ALL))
 					textViewer.doOperation(ITextOperationTarget.SELECT_ALL);
 			};
 		};
 		selectAllAction
 				.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_SELECT_ALL);

 	}

 	private void createAdditionalAction() {
 		if (shell != null) {
 			ResourceBundle fgBundleForConstructedKeys = ResourceBundle
 					.getBundle(BUNDLE_FOR_CONSTRUCTED_KEYS);

 			findAction = new FindReplaceAction(
 					fgBundleForConstructedKeys, "Editor.FindReplace.", shell, textViewer.getFindReplaceTarget()); //$NON-NLS-1$
 			findAction
 					.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_FIND_AND_REPLACE);
 		}

 		contentAssistAction = new Action() {
 			@Override
 			public void run() {
 				if (textViewer.isEditable()
 						&& textViewer.getTextWidget().isFocusControl()) {
 					Display display = Display.getCurrent();

 					BusyIndicator.showWhile(display, new Runnable() {
 						public void run() {
 							textViewer
 									.doOperation(ISourceViewer.CONTENTASSIST_PROPOSALS);
 						}
 					});
 				}
 			}
 		};
 		contentAssistAction
 				.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_CONTENT_ASSIST);

 		// create gotoLine action only if textViewer not in editPart
 		if (partSite == null && textViewer.getDocument() != null) {
 			gotoLineAction = new GotoScriptLineAction(textViewer);
 			gotoLineAction
 					.setActionDefinitionId(ITextEditorActionDefinitionIds.LINE_GOTO);
 		}
 	}

 	private void setAcceleratorLabel() {
 		if (undoAction != null) {
 			undoAction.setAccelerator(KeyCodeAcceleratorFormat("M1+Z")); //$NON-NLS-1$
 		}
 		if (redoAction != null) {
 			redoAction.setAccelerator(KeyCodeAcceleratorFormat("M1+Y")); //$NON-NLS-1$
 		}
 		cutAction.setAccelerator(KeyCodeAcceleratorFormat("M1+X")); //$NON-NLS-1$
 		copyAction.setAccelerator(KeyCodeAcceleratorFormat("M1+C")); //$NON-NLS-1$
 		pasteAction.setAccelerator(KeyCodeAcceleratorFormat("M1+V")); //$NON-NLS-1$
 		deleteAction.setAccelerator(KeyCodeAcceleratorFormat("DELETE")); //$NON-NLS-1$
 		selectAllAction.setAccelerator(KeyCodeAcceleratorFormat("M1+A")); //$NON-NLS-1$
 		if (gotoLineAction != null) {
 			gotoLineAction.setAccelerator(KeyCodeAcceleratorFormat("M1+L")); //$NON-NLS-1$
 		}
 	}

 	private int KeyCodeAcceleratorFormat(String shortcut) {
 		try {
 			return KeyStroke.getInstance(shortcut).getModifierKeys()
 					| KeyStroke.getInstance(shortcut).getNaturalKey();
 		} catch (ParseException e) {
 			return 0;
 		}
 	}

 	private void activateActions() {
 		IActionBars actionBars = getActionBars();
 		if (actionBars != null) {
 			actionBars.setGlobalActionHandler(ITextEditorActionConstants.UNDO,
 					undoAction);
 			actionBars.setGlobalActionHandler(ITextEditorActionConstants.REDO,
 					redoAction);
 			actionBars.setGlobalActionHandler(ITextEditorActionConstants.CUT,
 					cutAction);
 			actionBars.setGlobalActionHandler(ITextEditorActionConstants.COPY,
 					copyAction);
 			actionBars.setGlobalActionHandler(ITextEditorActionConstants.PASTE,
 					pasteAction);
 			actionBars.setGlobalActionHandler(
 					ITextEditorActionConstants.DELETE, deleteAction);
 			actionBars.setGlobalActionHandler(
 					ITextEditorActionConstants.SELECT_ALL, selectAllAction);
 			actionBars.setGlobalActionHandler(ITextEditorActionConstants.FIND,
 					findAction);
 			actionBars.setGlobalActionHandler(
 					ITextEditorActionConstants.CONTENT_ASSIST,
 					contentAssistAction);
 			actionBars.updateActionBars();
 		}
 	}

 	private void deactivateActions() {
 		IActionBars actionBars = getActionBars();
 		if (actionBars != null) {
 			actionBars.setGlobalActionHandler(ITextEditorActionConstants.UNDO,
 					null);
 			actionBars.setGlobalActionHandler(ITextEditorActionConstants.REDO,
 					null);
 			actionBars.setGlobalActionHandler(ITextEditorActionConstants.CUT,
 					null);
 			actionBars.setGlobalActionHandler(ITextEditorActionConstants.COPY,
 					null);
 			actionBars.setGlobalActionHandler(ITextEditorActionConstants.PASTE,
 					null);
 			actionBars.setGlobalActionHandler(
 					ITextEditorActionConstants.DELETE, null);
 			actionBars.setGlobalActionHandler(
 					ITextEditorActionConstants.SELECT_ALL, null);
 			actionBars.setGlobalActionHandler(ITextEditorActionConstants.FIND,
 					null);
 			actionBars.setGlobalActionHandler(
 					ITextEditorActionConstants.CONTENT_ASSIST, null);
 			actionBars.updateActionBars();
 		}
 	}

 	public void widgetDisposed(DisposeEvent e) {
 		deactivateActions();
 	}

 	public void focusGained(FocusEvent e) {
 		activateActions();
 	}

 	public void focusLost(FocusEvent e) {
 		deactivateActions();
 	}

 	private ImageDescriptor getImageDescriptor(String imageId) {
 		return PlatformUI.getWorkbench().getSharedImages()
 				.getImageDescriptor(imageId);
 	}

 	private StyledText getTextWidget() {
 		return textViewer.getTextWidget();
 	}

 	private IActionBars getActionBars() {
 		if (partSite instanceof IEditorSite)
 			return ((IEditorSite) partSite).getActionBars();

 		if (partSite instanceof IViewSite)
 			return ((IViewSite) partSite).getActionBars();

 		return null;
 	}

 	private abstract class CustomOperationAction extends Action {

 		private IUndoContext undoContext = null;

 		CustomOperationAction(IUndoContext context) {
 			super(""); //$NON-NLS-1$
 			undoContext = context;
 			AddHistoryListener();
 			updateEnablement();
 		}

 		private void AddHistoryListener() {
 			getHistory().addOperationHistoryListener(
 					new IOperationHistoryListener() {
 						public void historyNotification(
 								OperationHistoryEvent event) {
 							if (event.getOperation().hasContext(undoContext)) {
 								updateEnablement();
 							}
 						}
 					});
 		}

 		protected abstract void updateEnablement();

 		IOperationHistory getHistory() {
 			return PlatformUI.getWorkbench().getOperationSupport()
 					.getOperationHistory();
 		}

 		final IUndoContext getUndoContext() {
 			return undoContext;
 		}
 	}

 	private class CustomUndoAction extends CustomOperationAction {

 		CustomUndoAction(IUndoContext context) {
 			super(context);

 			setText(Messages.TextViewerActionsSupport_UndoLabel);
 			setImageDescriptor(PlatformUI.getWorkbench().getSharedImages()
 					.getImageDescriptor(ISharedImages.IMG_TOOL_UNDO));
 			setDisabledImageDescriptor(PlatformUI.getWorkbench()
 					.getSharedImages()
 					.getImageDescriptor(ISharedImages.IMG_TOOL_UNDO_DISABLED));
 		}

 		public final void run() {
 			if (isEnabled()) {
 				try {
 					getHistory().undo(getUndoContext(), null, null);
 				} catch (ExecutionException e) {
 					Q7UIPlugin.log(e);
 				}
 			}
 		}

 		protected void updateEnablement() {
 			setEnabled(getHistory().canUndo(getUndoContext()));
 		}
 	}

 	private class CustomRedoAction extends CustomOperationAction {

 		CustomRedoAction(IUndoContext context) {
 			super(context);

 			setText(Messages.TextViewerActionsSupport_RedoLabel);
 			setImageDescriptor(PlatformUI.getWorkbench().getSharedImages()
 					.getImageDescriptor(ISharedImages.IMG_TOOL_REDO));
 			setDisabledImageDescriptor(PlatformUI.getWorkbench()
 					.getSharedImages()
 					.getImageDescriptor(ISharedImages.IMG_TOOL_REDO_DISABLED));
 		}

 		public final void run() {
 			if (isEnabled()) {
 				try {
 					getHistory().redo(getUndoContext(), null, null);
 				} catch (ExecutionException e) {
 					e.printStackTrace();
 				}
 			}
 		}

 		protected void updateEnablement() {
 			setEnabled(getHistory().canRedo(getUndoContext()));
 		}
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2009, 2014 Xored Software Inc and others.
	* 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:
	* Xored Software Inc - initial API and implementation and/or initial documentation
	*******************************************************************************/
	package org.eclipse.rcptt.ui.editors;

	import java.util.ResourceBundle;

	import org.eclipse.core.commands.ExecutionException;
	import org.eclipse.core.commands.operations.IOperationHistory;
	import org.eclipse.core.commands.operations.IOperationHistoryListener;
	import org.eclipse.core.commands.operations.IUndoContext;
	import org.eclipse.core.commands.operations.OperationHistoryEvent;
	import org.eclipse.core.databinding.DataBindingContext;
	import org.eclipse.core.databinding.observable.ChangeEvent;
	import org.eclipse.core.databinding.observable.IChangeListener;
	import org.eclipse.core.databinding.observable.value.IObservableValue;
	import org.eclipse.jface.action.Action;
	import org.eclipse.jface.action.IMenuListener;
	import org.eclipse.jface.action.IMenuManager;
	import org.eclipse.jface.action.MenuManager;
	import org.eclipse.jface.action.Separator;
	import org.eclipse.jface.bindings.keys.KeyStroke;
	import org.eclipse.jface.bindings.keys.ParseException;
	import org.eclipse.jface.resource.ImageDescriptor;
	import org.eclipse.jface.text.ITextOperationTarget;
	import org.eclipse.jface.text.ITextSelection;
	import org.eclipse.jface.text.ITextViewerExtension6;
	import org.eclipse.jface.text.IUndoManagerExtension;
	import org.eclipse.jface.text.TextViewer;
	import org.eclipse.jface.text.source.ISourceViewer;
	import org.eclipse.jface.viewers.ISelectionChangedListener;
	import org.eclipse.jface.viewers.SelectionChangedEvent;
	import org.eclipse.swt.custom.BusyIndicator;
	import org.eclipse.swt.custom.StyledText;
	import org.eclipse.swt.events.DisposeEvent;
	import org.eclipse.swt.events.DisposeListener;
	import org.eclipse.swt.events.FocusEvent;
	import org.eclipse.swt.events.FocusListener;
	import org.eclipse.swt.events.KeyAdapter;
	import org.eclipse.swt.events.KeyEvent;
	import org.eclipse.swt.widgets.Display;
	import org.eclipse.swt.widgets.Menu;
	import org.eclipse.swt.widgets.Shell;
	import org.eclipse.ui.IActionBars;
	import org.eclipse.ui.IEditorSite;
	import org.eclipse.ui.ISharedImages;
	import org.eclipse.ui.IViewSite;
	import org.eclipse.ui.IWorkbenchCommandConstants;
	import org.eclipse.ui.IWorkbenchPartSite;
	import org.eclipse.ui.PlatformUI;
	import org.eclipse.ui.operations.RedoActionHandler;
	import org.eclipse.ui.operations.UndoActionHandler;
	import org.eclipse.ui.texteditor.FindReplaceAction;
	import org.eclipse.ui.texteditor.ITextEditorActionConstants;
	import org.eclipse.ui.texteditor.ITextEditorActionDefinitionIds;
	import org.eclipse.ui.texteditor.ResourceAction;

	import org.eclipse.rcptt.internal.ui.Messages;
	import org.eclipse.rcptt.internal.ui.Q7UIPlugin;
	import org.eclipse.rcptt.ui.actions.GotoScriptLineAction;

	public class TextViewerActionsSupport implements FocusListener, DisposeListener {

	private final TextViewer textViewer;
	private final IWorkbenchPartSite partSite;
	private final Shell shell;
	private final IObservableValue editable;
	@SuppressWarnings("unused")
	private final DataBindingContext dbc = new DataBindingContext();

	private final static String CutLabel = Messages.TextViewerActionsSupport_CutLabel;
	private final static String CopyLabel = Messages.TextViewerActionsSupport_CopyLabel;
	private final static String PasteLabel = Messages.TextViewerActionsSupport_PasteLabel;
	private final static String DeleteLabel = Messages.TextViewerActionsSupport_DeleteLabel;
	private final static String SelectAllLabel = Messages.TextViewerActionsSupport_SelectAllLabel;

	final static String BUNDLE_FOR_CONSTRUCTED_KEYS = "org.eclipse.ui.texteditor.ConstructedEditorMessages";//$NON-NLS-1$

	private Action undoAction;
	private Action redoAction;

	private Action cutAction;
	private Action copyAction;
	private Action pasteAction;
	private Action deleteAction;
	private Action selectAllAction;

	private ResourceAction findAction;

	private Action contentAssistAction;
	private Action gotoLineAction;

	public TextViewerActionsSupport(TextViewer textViewer,
	IWorkbenchPartSite partSite, IObservableValue editable) {
	this.textViewer = textViewer;
	this.partSite = partSite;
	this.shell = partSite.getShell();
	this.editable = editable;
	init();
	}

	public TextViewerActionsSupport(TextViewer textViewer, Shell shell,
	IObservableValue editable) {
	this.textViewer = textViewer;
	this.partSite = null;
	this.shell = shell;
	this.editable = editable;
	init();
	}

	private void init() {
	addListeners();
	createActions();
	if (partSite == null) {
	setAcceleratorLabel();
	} else if (getTextWidget() != null && getTextWidget().isFocusControl()) {
	activateActions();
	}
	updateEditActionsEnablement();
	editable.addChangeListener(new IChangeListener() {
	public void handleChange(ChangeEvent event) {
	updateEditActionsEnablement();
	}
	});
	createPopupMenu();
	}

	public Action getUndoAction() {
	return undoAction;
	}

	public Action getRedoAction() {
	return redoAction;
	}

	public Action getCutAction() {
	return cutAction;
	}

	public Action getCopyAction() {
	return copyAction;
	}

	public Action getPasteAction() {
	return pasteAction;
	}

	public Action getDeleteAction() {
	return deleteAction;
	}

	public Action getSelectAllAction() {
	return selectAllAction;
	}

	public ResourceAction getFindAction() {
	return findAction;
	}

	public Action getContentAssistAction() {
	return contentAssistAction;
	}

	public Action getGotoLineAction() {
	return gotoLineAction;
	}

	private void addListeners() {
	if (getTextWidget() != null) {
	if (partSite != null) {
	getTextWidget().addFocusListener(this);
	getTextWidget().addDisposeListener(this);
	} else {
	getTextWidget().addKeyListener(new KeyAdapter() {
	public void keyPressed(KeyEvent event) {
	try {
	processKeyDown(event);
	} catch (ParseException e) {
	Q7UIPlugin.log(e);
	}
	}
	});
	}
	}
	this.textViewer
	.addSelectionChangedListener(new ISelectionChangedListener() {
	public void selectionChanged(SelectionChangedEvent event) {
	updateEditActionsEnablement();
	}
	});
	}

	private void processKeyDown(KeyEvent e) throws ParseException {
	KeyStroke pressed = KeyStroke.getInstance(e.stateMask,
	Character.toUpperCase(e.keyCode));

	if (pressed.equals(KeyStroke.getInstance("M1+Z"))) { //$NON-NLS-1$
	undoAction.run();
	} else if (pressed.equals(KeyStroke.getInstance("M1+Y"))) { //$NON-NLS-1$
	redoAction.run();
	} else if (pressed.equals(KeyStroke.getInstance("M1+A"))) { //$NON-NLS-1$
	selectAllAction.run();
	} else if (pressed.equals(KeyStroke.getInstance("M1+F"))) { //$NON-NLS-1$
	findAction.run();
	} else if (pressed.equals(KeyStroke.getInstance("Ctrl+Space"))) { //$NON-NLS-1$
	contentAssistAction.run();
	} else if (gotoLineAction != null
	&& pressed.equals(KeyStroke.getInstance("M1+L"))) { //$NON-NLS-1$
	gotoLineAction.run();
	}

	}

	private void createPopupMenu() {
	if (getTextWidget() != null) {
	MenuManager popupMenuManager = new MenuManager();
	IMenuListener listener = new IMenuListener() {
	public void menuAboutToShow(IMenuManager mng) {
	fillContextMenu(mng);
	}
	};
	popupMenuManager.addMenuListener(listener);
	popupMenuManager.setRemoveAllWhenShown(true);
	Menu menu = popupMenuManager.createContextMenu(textViewer
	.getControl());
	getTextWidget().setMenu(menu);
	}
	}

	private void fillContextMenu(IMenuManager menuManager) {
	if (undoAction != null)
	menuManager.add(undoAction);
	if (redoAction != null)
	menuManager.add(redoAction);
	if (undoAction != null \|\| redoAction != null)
	menuManager.add(new Separator());
	menuManager.add(cutAction);
	menuManager.add(copyAction);
	menuManager.add(pasteAction);
	menuManager.add(new Separator());
	menuManager.add(deleteAction);
	menuManager.add(selectAllAction);
	}

	private void updateEditActionsEnablement() {
	ITextSelection selection = (ITextSelection) textViewer.getSelection();
	boolean hasSelectedText = !selection.isEmpty()
	&& selection.getLength() > 0;
	boolean isEditable = (Boolean) editable.getValue();
	cutAction.setEnabled(isEditable && hasSelectedText);
	copyAction.setEnabled(hasSelectedText);
	pasteAction.setEnabled(isEditable);
	deleteAction.setEnabled(isEditable && hasSelectedText);
	if (findAction != null) {
	findAction.setEnabled(true);
	}
	}

	private void createActions() {
	createUndoRedoActions();
	createCommonTextAction();
	createAdditionalAction();
	}

	private void createUndoRedoActions() {
	if (textViewer instanceof ITextViewerExtension6
	&& textViewer.getUndoManager() instanceof IUndoManagerExtension) {

	final IUndoContext undoContext = ((IUndoManagerExtension) textViewer
	.getUndoManager()).getUndoContext();
	if (undoContext != null) {

	if (partSite != null) {
	undoAction = new UndoActionHandler(partSite, undoContext);
	redoAction = new RedoActionHandler(partSite, undoContext);
	} else {
	undoAction = new CustomUndoAction(undoContext);
	redoAction = new CustomRedoAction(undoContext);
	}
	undoAction
	.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_UNDO);
	redoAction
	.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_REDO);

	textViewer.getUndoManager().reset();
	}
	}
	}

	private void createCommonTextAction() {
	cutAction = new Action(CutLabel) {
	public void run() {
	if (textViewer.canDoOperation(ITextOperationTarget.CUT))
	textViewer.doOperation(ITextOperationTarget.CUT);
	};
	};
	cutAction.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_CUT);
	cutAction
	.setImageDescriptor(getImageDescriptor(ISharedImages.IMG_TOOL_CUT));
	cutAction
	.setDisabledImageDescriptor(getImageDescriptor(ISharedImages.IMG_TOOL_CUT_DISABLED));

	copyAction = new Action(CopyLabel) {
	public void run() {
	if (textViewer.canDoOperation(ITextOperationTarget.COPY))
	textViewer.doOperation(ITextOperationTarget.COPY);
	};
	};
	copyAction.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_COPY);
	copyAction
	.setImageDescriptor(getImageDescriptor(ISharedImages.IMG_TOOL_COPY));
	copyAction
	.setDisabledImageDescriptor(getImageDescriptor(ISharedImages.IMG_TOOL_COPY_DISABLED));

	pasteAction = new Action(PasteLabel) {
	public void run() {
	if (textViewer.canDoOperation(ITextOperationTarget.PASTE))
	textViewer.doOperation(ITextOperationTarget.PASTE);
	};
	};
	pasteAction
	.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_PASTE);
	pasteAction
	.setImageDescriptor(getImageDescriptor(ISharedImages.IMG_TOOL_PASTE));
	pasteAction
	.setDisabledImageDescriptor(getImageDescriptor(ISharedImages.IMG_TOOL_PASTE_DISABLED));

	deleteAction = new Action(DeleteLabel) {
	public void run() {
	if (textViewer.canDoOperation(ITextOperationTarget.DELETE))
	textViewer.doOperation(ITextOperationTarget.DELETE);
	};
	};
	deleteAction
	.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_DELETE);
	deleteAction
	.setImageDescriptor(getImageDescriptor(ISharedImages.IMG_TOOL_DELETE));
	deleteAction
	.setDisabledImageDescriptor(getImageDescriptor(ISharedImages.IMG_TOOL_DELETE_DISABLED));

	selectAllAction = new Action(SelectAllLabel) {
	public void run() {
	if (textViewer.canDoOperation(ITextOperationTarget.SELECT_ALL))
	textViewer.doOperation(ITextOperationTarget.SELECT_ALL);
	};
	};
	selectAllAction
	.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_SELECT_ALL);

	}

	private void createAdditionalAction() {
	if (shell != null) {
	ResourceBundle fgBundleForConstructedKeys = ResourceBundle
	.getBundle(BUNDLE_FOR_CONSTRUCTED_KEYS);

	findAction = new FindReplaceAction(
	fgBundleForConstructedKeys, "Editor.FindReplace.", shell, textViewer.getFindReplaceTarget()); //$NON-NLS-1$
	findAction
	.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_FIND_AND_REPLACE);
	}

	contentAssistAction = new Action() {
	@Override
	public void run() {
	if (textViewer.isEditable()
	&& textViewer.getTextWidget().isFocusControl()) {
	Display display = Display.getCurrent();

	BusyIndicator.showWhile(display, new Runnable() {
	public void run() {
	textViewer
	.doOperation(ISourceViewer.CONTENTASSIST_PROPOSALS);
	}
	});
	}
	}
	};
	contentAssistAction
	.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_CONTENT_ASSIST);

	// create gotoLine action only if textViewer not in editPart
	if (partSite == null && textViewer.getDocument() != null) {
	gotoLineAction = new GotoScriptLineAction(textViewer);
	gotoLineAction
	.setActionDefinitionId(ITextEditorActionDefinitionIds.LINE_GOTO);
	}
	}

	private void setAcceleratorLabel() {
	if (undoAction != null) {
	undoAction.setAccelerator(KeyCodeAcceleratorFormat("M1+Z")); //$NON-NLS-1$
	}
	if (redoAction != null) {
	redoAction.setAccelerator(KeyCodeAcceleratorFormat("M1+Y")); //$NON-NLS-1$
	}
	cutAction.setAccelerator(KeyCodeAcceleratorFormat("M1+X")); //$NON-NLS-1$
	copyAction.setAccelerator(KeyCodeAcceleratorFormat("M1+C")); //$NON-NLS-1$
	pasteAction.setAccelerator(KeyCodeAcceleratorFormat("M1+V")); //$NON-NLS-1$
	deleteAction.setAccelerator(KeyCodeAcceleratorFormat("DELETE")); //$NON-NLS-1$
	selectAllAction.setAccelerator(KeyCodeAcceleratorFormat("M1+A")); //$NON-NLS-1$
	if (gotoLineAction != null) {
	gotoLineAction.setAccelerator(KeyCodeAcceleratorFormat("M1+L")); //$NON-NLS-1$
	}
	}

	private int KeyCodeAcceleratorFormat(String shortcut) {
	try {
	return KeyStroke.getInstance(shortcut).getModifierKeys()
	\| KeyStroke.getInstance(shortcut).getNaturalKey();
	} catch (ParseException e) {
	return 0;
	}
	}

	private void activateActions() {
	IActionBars actionBars = getActionBars();
	if (actionBars != null) {
	actionBars.setGlobalActionHandler(ITextEditorActionConstants.UNDO,
	undoAction);
	actionBars.setGlobalActionHandler(ITextEditorActionConstants.REDO,
	redoAction);
	actionBars.setGlobalActionHandler(ITextEditorActionConstants.CUT,
	cutAction);
	actionBars.setGlobalActionHandler(ITextEditorActionConstants.COPY,
	copyAction);
	actionBars.setGlobalActionHandler(ITextEditorActionConstants.PASTE,
	pasteAction);
	actionBars.setGlobalActionHandler(
	ITextEditorActionConstants.DELETE, deleteAction);
	actionBars.setGlobalActionHandler(
	ITextEditorActionConstants.SELECT_ALL, selectAllAction);
	actionBars.setGlobalActionHandler(ITextEditorActionConstants.FIND,
	findAction);
	actionBars.setGlobalActionHandler(
	ITextEditorActionConstants.CONTENT_ASSIST,
	contentAssistAction);
	actionBars.updateActionBars();
	}
	}

	private void deactivateActions() {
	IActionBars actionBars = getActionBars();
	if (actionBars != null) {
	actionBars.setGlobalActionHandler(ITextEditorActionConstants.UNDO,
	null);
	actionBars.setGlobalActionHandler(ITextEditorActionConstants.REDO,
	null);
	actionBars.setGlobalActionHandler(ITextEditorActionConstants.CUT,
	null);
	actionBars.setGlobalActionHandler(ITextEditorActionConstants.COPY,
	null);
	actionBars.setGlobalActionHandler(ITextEditorActionConstants.PASTE,
	null);
	actionBars.setGlobalActionHandler(
	ITextEditorActionConstants.DELETE, null);
	actionBars.setGlobalActionHandler(
	ITextEditorActionConstants.SELECT_ALL, null);
	actionBars.setGlobalActionHandler(ITextEditorActionConstants.FIND,
	null);
	actionBars.setGlobalActionHandler(
	ITextEditorActionConstants.CONTENT_ASSIST, null);
	actionBars.updateActionBars();
	}
	}

	public void widgetDisposed(DisposeEvent e) {
	deactivateActions();
	}

	public void focusGained(FocusEvent e) {
	activateActions();
	}

	public void focusLost(FocusEvent e) {
	deactivateActions();
	}

	private ImageDescriptor getImageDescriptor(String imageId) {
	return PlatformUI.getWorkbench().getSharedImages()
	.getImageDescriptor(imageId);
	}

	private StyledText getTextWidget() {
	return textViewer.getTextWidget();
	}

	private IActionBars getActionBars() {
	if (partSite instanceof IEditorSite)
	return ((IEditorSite) partSite).getActionBars();

	if (partSite instanceof IViewSite)
	return ((IViewSite) partSite).getActionBars();

	return null;
	}

	private abstract class CustomOperationAction extends Action {

	private IUndoContext undoContext = null;

	CustomOperationAction(IUndoContext context) {
	super(""); //$NON-NLS-1$
	undoContext = context;
	AddHistoryListener();
	updateEnablement();
	}

	private void AddHistoryListener() {
	getHistory().addOperationHistoryListener(
	new IOperationHistoryListener() {
	public void historyNotification(
	OperationHistoryEvent event) {
	if (event.getOperation().hasContext(undoContext)) {
	updateEnablement();
	}
	}
	});
	}

	protected abstract void updateEnablement();

	IOperationHistory getHistory() {
	return PlatformUI.getWorkbench().getOperationSupport()
	.getOperationHistory();
	}

	final IUndoContext getUndoContext() {
	return undoContext;
	}
	}

	private class CustomUndoAction extends CustomOperationAction {

	CustomUndoAction(IUndoContext context) {
	super(context);

	setText(Messages.TextViewerActionsSupport_UndoLabel);
	setImageDescriptor(PlatformUI.getWorkbench().getSharedImages()
	.getImageDescriptor(ISharedImages.IMG_TOOL_UNDO));
	setDisabledImageDescriptor(PlatformUI.getWorkbench()
	.getSharedImages()
	.getImageDescriptor(ISharedImages.IMG_TOOL_UNDO_DISABLED));
	}

	public final void run() {
	if (isEnabled()) {
	try {
	getHistory().undo(getUndoContext(), null, null);
	} catch (ExecutionException e) {
	Q7UIPlugin.log(e);
	}
	}
	}

	protected void updateEnablement() {
	setEnabled(getHistory().canUndo(getUndoContext()));
	}
	}

	private class CustomRedoAction extends CustomOperationAction {

	CustomRedoAction(IUndoContext context) {
	super(context);

	setText(Messages.TextViewerActionsSupport_RedoLabel);
	setImageDescriptor(PlatformUI.getWorkbench().getSharedImages()
	.getImageDescriptor(ISharedImages.IMG_TOOL_REDO));
	setDisabledImageDescriptor(PlatformUI.getWorkbench()
	.getSharedImages()
	.getImageDescriptor(ISharedImages.IMG_TOOL_REDO_DISABLED));
	}

	public final void run() {
	if (isEnabled()) {
	try {
	getHistory().redo(getUndoContext(), null, null);
	} catch (ExecutionException e) {
	e.printStackTrace();
	}
	}
	}

	protected void updateEnablement() {
	setEnabled(getHistory().canRedo(getUndoContext()));
	}
	}
	}