org.eclipse.ui.workbench.texteditor/src/org/eclipse/ui/texteditor/templates/EditTemplateDialog.java - platform/eclipse.platform.text - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2004 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Common Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/cpl-v10.html
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.texteditor.templates;

 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.StyledText;
 import org.eclipse.swt.custom.VerifyKeyListener;
 import org.eclipse.swt.events.FocusEvent;
 import org.eclipse.swt.events.FocusListener;
 import org.eclipse.swt.events.ModifyEvent;
 import org.eclipse.swt.events.ModifyListener;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.events.SelectionListener;
 import org.eclipse.swt.events.VerifyEvent;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Combo;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Menu;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.swt.widgets.Text;
 import org.eclipse.swt.widgets.Widget;
 import org.eclipse.jface.action.Action;
 import org.eclipse.jface.action.GroupMarker;
 import org.eclipse.jface.action.IAction;
 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.viewers.ISelectionChangedListener;
 import org.eclipse.jface.viewers.SelectionChangedEvent;
 import org.eclipse.jface.text.Document;
 import org.eclipse.jface.text.IDocument;
 import org.eclipse.jface.text.ITextListener;
 import org.eclipse.jface.text.ITextOperationTarget;
 import org.eclipse.jface.text.ITextViewer;
 import org.eclipse.jface.text.TextEvent;
 import org.eclipse.jface.text.contentassist.ContentAssistant;
 import org.eclipse.jface.text.contentassist.IContentAssistant;
 import org.eclipse.jface.text.source.ISourceViewer;
 import org.eclipse.jface.text.source.SourceViewer;
 import org.eclipse.jface.text.source.SourceViewerConfiguration;
 import org.eclipse.jface.text.templates.TemplateContextType;
 import org.eclipse.jface.text.templates.ContextTypeRegistry;
 import org.eclipse.jface.text.templates.Template;
 import org.eclipse.jface.text.templates.TemplateException;

 import org.eclipse.ui.texteditor.ITextEditorActionConstants;
 import org.eclipse.ui.texteditor.IUpdate;

 /**
  * Dialog to edit a template. Clients will usually instantiate, but may also may
  * extend.
  *
  * @since 3.0
  */
 class EditTemplateDialog extends StatusDialog {

 	private static class TextViewerAction extends Action implements IUpdate {

 		private int fOperationCode= -1;
 		private ITextOperationTarget fOperationTarget;

 		/**
 		 * Creates a new action.
 		 *
 		 * @param viewer the viewer
 		 * @param operationCode the opcode
 		 */
 		public TextViewerAction(ITextViewer viewer, int operationCode) {
 			fOperationCode= operationCode;
 			fOperationTarget= viewer.getTextOperationTarget();
 			update();
 		}

 		/**
 		 * Updates the enabled state of the action.
 		 * Fires a property change if the enabled state changes.
 		 *
 		 * @see Action#firePropertyChange(String, Object, Object)
 		 */
 		public void update() {

 			boolean wasEnabled= isEnabled();
 			boolean isEnabled= (fOperationTarget != null && fOperationTarget.canDoOperation(fOperationCode));
 			setEnabled(isEnabled);

 			if (wasEnabled != isEnabled) {
 				firePropertyChange(ENABLED, wasEnabled ? Boolean.TRUE : Boolean.FALSE, isEnabled ? Boolean.TRUE : Boolean.FALSE);
 			}
 		}

 		/**
 		 * @see Action#run()
 		 */
 		public void run() {
 			if (fOperationCode != -1 && fOperationTarget != null) {
 				fOperationTarget.doOperation(fOperationCode);
 			}
 		}
 	}

 	private final Template fTemplate;

 	private Text fNameText;
 	private Text fDescriptionText;
 	private Combo fContextCombo;
 	private SourceViewer fPatternEditor;
 	private Button fInsertVariableButton;
 	private boolean fIsNameModifiable;

 	private StatusInfo fValidationStatus;
 	private boolean fSuppressError= true; // #4354
 	private Map fGlobalActions= new HashMap(10);
 	private List fSelectionActions = new ArrayList(3);
 	private String[][] fContextTypes;

 	private ContextTypeRegistry fContextTypeRegistry;

 	private final TemplateVariableProcessor fTemplateProcessor= new TemplateVariableProcessor();

 	/**
 	 * Creates a new dialog.
 	 *
 	 * @param parent the shell parent of the dialog
 	 * @param template the template to edit
 	 * @param edit whether this is a new template or an existing being edited
 	 * @param isNameModifiable whether the name of the template may be modified
 	 * @param registry the context type registry to use
 	 */
 	public EditTemplateDialog(Shell parent, Template template, boolean edit, boolean isNameModifiable, ContextTypeRegistry registry) {
 		super(parent);

 		setShellStyle(getShellStyle() | SWT.MAX | SWT.RESIZE);

 		String title= edit
 			? TextEditorTemplateMessages.getString("EditTemplateDialog.title.edit") //$NON-NLS-1$
 			: TextEditorTemplateMessages.getString("EditTemplateDialog.title.new"); //$NON-NLS-1$
 		setTitle(title);

 		fTemplate= template;
 		fIsNameModifiable= isNameModifiable;

 		List contexts= new ArrayList();
 		for (Iterator it= registry.contextTypes(); it.hasNext();) {
 			TemplateContextType type= (TemplateContextType) it.next();
 			contexts.add(new String[] { type.getId(), type.getName() });
 		}
 		fContextTypes= (String[][]) contexts.toArray(new String[contexts.size()][]);

 		fValidationStatus= new StatusInfo();

 		fContextTypeRegistry= registry;

 		TemplateContextType type= fContextTypeRegistry.getContextType(template.getContextTypeId());
 		fTemplateProcessor.setContextType(type);
 	}

 	/*
 	 * @see org.eclipse.ui.texteditor.templates.StatusDialog#create()
 	 */
 	public void create() {
 		super.create();
 		// update initial ok button to be disabled for new templates
 		boolean valid= fNameText == null || fNameText.getText().trim().length() != 0;
 		if (!valid) {
 			StatusInfo status = new StatusInfo();
 			status.setError(TextEditorTemplateMessages.getString("EditTemplateDialog.error.noname")); //$NON-NLS-1$
 			updateButtonsEnableState(status);
  		}
 	}

 	/*
 	 * @see Dialog#createDialogArea(Composite)
 	 */
 	protected Control createDialogArea(Composite ancestor) {
 		Composite parent= new Composite(ancestor, SWT.NONE);
 		GridLayout layout= new GridLayout();
 		layout.numColumns= 2;
 		parent.setLayout(layout);
 		parent.setLayoutData(new GridData(GridData.FILL_BOTH));

 		ModifyListener listener= new ModifyListener() {
 			public void modifyText(ModifyEvent e) {
 				doTextWidgetChanged(e.widget);
 			}
 		};

 		if (fIsNameModifiable) {
 			createLabel(parent, TextEditorTemplateMessages.getString("EditTemplateDialog.name")); //$NON-NLS-1$

 			Composite composite= new Composite(parent, SWT.NONE);
 			composite.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
 			layout= new GridLayout();
 			layout.numColumns= 3;
 			layout.marginWidth= 0;
 			layout.marginHeight= 0;
 			composite.setLayout(layout);

 			fNameText= createText(composite);
 			fNameText.addModifyListener(listener);
 			fNameText.addFocusListener(new FocusListener() {

 				public void focusGained(FocusEvent e) {
 				}

 				public void focusLost(FocusEvent e) {
 					if (fSuppressError) {
 						fSuppressError= false;
 						updateButtons();
 					}
 				}
 			});

 			createLabel(composite, TextEditorTemplateMessages.getString("EditTemplateDialog.context")); //$NON-NLS-1$
 			fContextCombo= new Combo(composite, SWT.READ_ONLY);

 			for (int i= 0; i < fContextTypes.length; i++) {
 				fContextCombo.add(fContextTypes[i][1]);
 			}

 			fContextCombo.addModifyListener(listener);
 		}

 		createLabel(parent, TextEditorTemplateMessages.getString("EditTemplateDialog.description")); //$NON-NLS-1$

 		int descFlags= fIsNameModifiable ? SWT.BORDER : SWT.BORDER | SWT.READ_ONLY;
 		fDescriptionText= new Text(parent, descFlags );
 		fDescriptionText.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

 		fDescriptionText.addModifyListener(listener);

 		Label patternLabel= createLabel(parent, TextEditorTemplateMessages.getString("EditTemplateDialog.pattern")); //$NON-NLS-1$
 		patternLabel.setLayoutData(new GridData(GridData.VERTICAL_ALIGN_BEGINNING));
 		fPatternEditor= createEditor(parent);

 		Label filler= new Label(parent, SWT.NONE);
 		filler.setLayoutData(new GridData());

 		Composite composite= new Composite(parent, SWT.NONE);
 		layout= new GridLayout();
 		layout.marginWidth= 0;
 		layout.marginHeight= 0;
 		composite.setLayout(layout);
 		composite.setLayoutData(new GridData());

 		fInsertVariableButton= new Button(composite, SWT.NONE);
 		fInsertVariableButton.setLayoutData(getButtonGridData(fInsertVariableButton));
 		fInsertVariableButton.setText(TextEditorTemplateMessages.getString("EditTemplateDialog.insert.variable")); //$NON-NLS-1$
 		fInsertVariableButton.addSelectionListener(new SelectionListener() {
 			public void widgetSelected(SelectionEvent e) {
 				fPatternEditor.getTextWidget().setFocus();
 				fPatternEditor.doOperation(ISourceViewer.CONTENTASSIST_PROPOSALS);
 			}

 			public void widgetDefaultSelected(SelectionEvent e) {}
 		});

 		fDescriptionText.setText(fTemplate.getDescription());
 		if (fIsNameModifiable) {
 			fNameText.setText(fTemplate.getName());
 			fNameText.addModifyListener(listener);
 			fContextCombo.select(getIndex(fTemplate.getContextTypeId()));
 		} else {
 			fPatternEditor.getControl().setFocus();
 		}
 		initializeActions();

 		applyDialogFont(parent);
 		return composite;
 	}

 	private void doTextWidgetChanged(Widget w) {
 		if (w == fNameText) {
 			fSuppressError= false;
 			String name= fNameText.getText();
 			fTemplate.setName(name);
 			updateButtons();
 		} else if (w == fContextCombo) {
 			String name= fContextCombo.getText();
 			String contextId= getContextId(name);
 			fTemplate.setContextTypeId(contextId);
 			fTemplateProcessor.setContextType(fContextTypeRegistry.getContextType(contextId));
 		} else if (w == fDescriptionText) {
 			String desc= fDescriptionText.getText();
 			fTemplate.setDescription(desc);
 		}
 	}

 	private String getContextId(String name) {
 		if (name == null)
 			return name;

 		for (int i= 0; i < fContextTypes.length; i++) {
 			if (name.equals(fContextTypes[i][1])) {
 				return fContextTypes[i][0];
 			}
 		}
 		return name;
 	}

 	private void doSourceChanged(IDocument document) {
 		String text= document.get();
 		fTemplate.setPattern(text);
 		fValidationStatus.setOK();
 		TemplateContextType contextType= fContextTypeRegistry.getContextType(fTemplate.getContextTypeId());
 		if (contextType != null) {
 			try {
 				contextType.validate(text);
 			} catch (TemplateException e) {
 				fValidationStatus.setError(e.getLocalizedMessage());
 			}
 		}

 		updateUndoAction();
 		updateButtons();
 	}

 	private static GridData getButtonGridData(Button button) {
 		GridData data= new GridData(GridData.FILL_HORIZONTAL);
 		// TODO get some button hints.
 //		data.heightHint= SWTUtil.getButtonHeightHint(button);

 		return data;
 	}

 	private static Label createLabel(Composite parent, String name) {
 		Label label= new Label(parent, SWT.NULL);
 		label.setText(name);
 		label.setLayoutData(new GridData());

 		return label;
 	}

 	private static Text createText(Composite parent) {
 		Text text= new Text(parent, SWT.BORDER);
 		text.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

 		return text;
 	}

 	private SourceViewer createEditor(Composite parent) {
 		SourceViewer viewer= createViewer(parent);

 		IDocument document= new Document(fTemplate.getPattern());
 		viewer.setEditable(true);
 		viewer.setDocument(document);


 		int nLines= document.getNumberOfLines();
 		if (nLines < 5) {
 			nLines= 5;
 		} else if (nLines > 12) {
 			nLines= 12;
 		}

 		Control control= viewer.getControl();
 		GridData data= new GridData(GridData.FILL_BOTH);
 		data.widthHint= convertWidthInCharsToPixels(80);
 		data.heightHint= convertHeightInCharsToPixels(nLines);
 		control.setLayoutData(data);

 		viewer.addTextListener(new ITextListener() {
 			public void textChanged(TextEvent event) {
 				if (event .getDocumentEvent() != null)
 					doSourceChanged(event.getDocumentEvent().getDocument());
 			}
 		});

 		viewer.addSelectionChangedListener(new ISelectionChangedListener() {
 			public void selectionChanged(SelectionChangedEvent event) {
 				updateSelectionDependentActions();
 			}
 		});

 	 	viewer.prependVerifyKeyListener(new VerifyKeyListener() {
 			public void verifyKey(VerifyEvent event) {
 				handleVerifyKeyPressed(event);
 			}
 		});

 		return viewer;
 	}

 	/**
 	 * Creates the viewer to be used to display the pattern. Subclasses may override.
 	 *
 	 * @param parent the parent composite of the viewer
 	 * @return a configured <code>SourceViewer</code>
 	 */
 	protected SourceViewer createViewer(Composite parent) {
 		SourceViewer viewer= new SourceViewer(parent, null, null, false, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
 		SourceViewerConfiguration configuration= new SourceViewerConfiguration() {
 			public IContentAssistant getContentAssistant(ISourceViewer sourceViewer) {

 				ContentAssistant assistant= new ContentAssistant();
 				assistant.enableAutoActivation(true);
 				assistant.enableAutoInsert(true);
 				assistant.setContentAssistProcessor(fTemplateProcessor, IDocument.DEFAULT_CONTENT_TYPE);
 				return assistant;
 			}
 		};
 		viewer.configure(configuration);
 		return viewer;
 	}

 	private void handleVerifyKeyPressed(VerifyEvent event) {
 		if (!event.doit)
 			return;

 		if (event.stateMask != SWT.MOD1)
 			return;

 		switch (event.character) {
 			case ' ':
 				fPatternEditor.doOperation(ISourceViewer.CONTENTASSIST_PROPOSALS);
 				event.doit= false;
 				break;

 			// CTRL-Z
 			case 'z' - 'a' + 1:
 				fPatternEditor.doOperation(ITextOperationTarget.UNDO);
 				event.doit= false;
 				break;
 		}
 	}

 	private void initializeActions() {
 		TextViewerAction action= new TextViewerAction(fPatternEditor, ITextOperationTarget.UNDO);
 		action.setText(TextEditorTemplateMessages.getString("EditTemplateDialog.undo")); //$NON-NLS-1$
 		fGlobalActions.put(ITextEditorActionConstants.UNDO, action);

 		action= new TextViewerAction(fPatternEditor, ITextOperationTarget.CUT);
 		action.setText(TextEditorTemplateMessages.getString("EditTemplateDialog.cut")); //$NON-NLS-1$
 		fGlobalActions.put(ITextEditorActionConstants.CUT, action);

 		action= new TextViewerAction(fPatternEditor, ITextOperationTarget.COPY);
 		action.setText(TextEditorTemplateMessages.getString("EditTemplateDialog.copy")); //$NON-NLS-1$
 		fGlobalActions.put(ITextEditorActionConstants.COPY, action);

 		action= new TextViewerAction(fPatternEditor, ITextOperationTarget.PASTE);
 		action.setText(TextEditorTemplateMessages.getString("EditTemplateDialog.paste")); //$NON-NLS-1$
 		fGlobalActions.put(ITextEditorActionConstants.PASTE, action);

 		action= new TextViewerAction(fPatternEditor, ITextOperationTarget.SELECT_ALL);
 		action.setText(TextEditorTemplateMessages.getString("EditTemplateDialog.select.all")); //$NON-NLS-1$
 		fGlobalActions.put(ITextEditorActionConstants.SELECT_ALL, action);

 		action= new TextViewerAction(fPatternEditor, ISourceViewer.CONTENTASSIST_PROPOSALS);
 		action.setText(TextEditorTemplateMessages.getString("EditTemplateDialog.content.assist")); //$NON-NLS-1$
 		fGlobalActions.put("ContentAssistProposal", action); //$NON-NLS-1$

 		fSelectionActions.add(ITextEditorActionConstants.CUT);
 		fSelectionActions.add(ITextEditorActionConstants.COPY);
 		fSelectionActions.add(ITextEditorActionConstants.PASTE);

 		// create context menu
 		MenuManager manager= new MenuManager(null, null);
 		manager.setRemoveAllWhenShown(true);
 		manager.addMenuListener(new IMenuListener() {
 			public void menuAboutToShow(IMenuManager mgr) {
 				fillContextMenu(mgr);
 			}
 		});

 		StyledText text= fPatternEditor.getTextWidget();
 		Menu menu= manager.createContextMenu(text);
 		text.setMenu(menu);
 	}

 	private void fillContextMenu(IMenuManager menu) {
 		menu.add(new GroupMarker(ITextEditorActionConstants.GROUP_UNDO));
 		menu.appendToGroup(ITextEditorActionConstants.GROUP_UNDO, (IAction) fGlobalActions.get(ITextEditorActionConstants.UNDO));

 		menu.add(new Separator(ITextEditorActionConstants.GROUP_EDIT));
 		menu.appendToGroup(ITextEditorActionConstants.GROUP_EDIT, (IAction) fGlobalActions.get(ITextEditorActionConstants.CUT));
 		menu.appendToGroup(ITextEditorActionConstants.GROUP_EDIT, (IAction) fGlobalActions.get(ITextEditorActionConstants.COPY));
 		menu.appendToGroup(ITextEditorActionConstants.GROUP_EDIT, (IAction) fGlobalActions.get(ITextEditorActionConstants.PASTE));
 		menu.appendToGroup(ITextEditorActionConstants.GROUP_EDIT, (IAction) fGlobalActions.get(ITextEditorActionConstants.SELECT_ALL));

 		menu.add(new Separator("templates")); //$NON-NLS-1$
 		menu.appendToGroup("templates", (IAction) fGlobalActions.get("ContentAssistProposal")); //$NON-NLS-1$ //$NON-NLS-2$
 	}

 	private void updateSelectionDependentActions() {
 		Iterator iterator= fSelectionActions.iterator();
 		while (iterator.hasNext())
 			updateAction((String)iterator.next());
 	}

 	private void updateUndoAction() {
 		IAction action= (IAction) fGlobalActions.get(ITextEditorActionConstants.UNDO);
 		if (action instanceof IUpdate)
 			((IUpdate) action).update();
 	}

 	private void updateAction(String actionId) {
 		IAction action= (IAction) fGlobalActions.get(actionId);
 		if (action instanceof IUpdate)
 			((IUpdate) action).update();
 	}

 	private int getIndex(String contextid) {

 		if (contextid == null)
 			return -1;

 		for (int i= 0; i < fContextTypes.length; i++) {
 			if (contextid.equals(fContextTypes[i][0])) {
 				return i;
 			}
 		}
 		return -1;
 	}

 	private void updateButtons() {
 		StatusInfo status;

 		boolean valid= fNameText == null || fNameText.getText().trim().length() != 0;
 		if (!valid) {
 			status = new StatusInfo();
 			if (!fSuppressError) {
 				status.setError(TextEditorTemplateMessages.getString("EditTemplateDialog.error.noname")); //$NON-NLS-1$
 			}
  		} else {
  			status= fValidationStatus;
  		}
 		updateStatus(status);
 	}

 }
	/*******************************************************************************
	* Copyright (c) 2000, 2004 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Common Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/cpl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.ui.texteditor.templates;

	import java.util.ArrayList;
	import java.util.HashMap;
	import java.util.Iterator;
	import java.util.List;
	import java.util.Map;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.custom.StyledText;
	import org.eclipse.swt.custom.VerifyKeyListener;
	import org.eclipse.swt.events.FocusEvent;
	import org.eclipse.swt.events.FocusListener;
	import org.eclipse.swt.events.ModifyEvent;
	import org.eclipse.swt.events.ModifyListener;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.events.SelectionListener;
	import org.eclipse.swt.events.VerifyEvent;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.layout.GridLayout;
	import org.eclipse.swt.widgets.Button;
	import org.eclipse.swt.widgets.Combo;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Menu;
	import org.eclipse.swt.widgets.Shell;
	import org.eclipse.swt.widgets.Text;
	import org.eclipse.swt.widgets.Widget;
	import org.eclipse.jface.action.Action;
	import org.eclipse.jface.action.GroupMarker;
	import org.eclipse.jface.action.IAction;
	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.viewers.ISelectionChangedListener;
	import org.eclipse.jface.viewers.SelectionChangedEvent;
	import org.eclipse.jface.text.Document;
	import org.eclipse.jface.text.IDocument;
	import org.eclipse.jface.text.ITextListener;
	import org.eclipse.jface.text.ITextOperationTarget;
	import org.eclipse.jface.text.ITextViewer;
	import org.eclipse.jface.text.TextEvent;
	import org.eclipse.jface.text.contentassist.ContentAssistant;
	import org.eclipse.jface.text.contentassist.IContentAssistant;
	import org.eclipse.jface.text.source.ISourceViewer;
	import org.eclipse.jface.text.source.SourceViewer;
	import org.eclipse.jface.text.source.SourceViewerConfiguration;
	import org.eclipse.jface.text.templates.TemplateContextType;
	import org.eclipse.jface.text.templates.ContextTypeRegistry;
	import org.eclipse.jface.text.templates.Template;
	import org.eclipse.jface.text.templates.TemplateException;

	import org.eclipse.ui.texteditor.ITextEditorActionConstants;
	import org.eclipse.ui.texteditor.IUpdate;

	/**
	* Dialog to edit a template. Clients will usually instantiate, but may also may
	* extend.
	*
	* @since 3.0
	*/
	class EditTemplateDialog extends StatusDialog {

	private static class TextViewerAction extends Action implements IUpdate {

	private int fOperationCode= -1;
	private ITextOperationTarget fOperationTarget;

	/**
	* Creates a new action.
	*
	* @param viewer the viewer
	* @param operationCode the opcode
	*/
	public TextViewerAction(ITextViewer viewer, int operationCode) {
	fOperationCode= operationCode;
	fOperationTarget= viewer.getTextOperationTarget();
	update();
	}

	/**
	* Updates the enabled state of the action.
	* Fires a property change if the enabled state changes.
	*
	* @see Action#firePropertyChange(String, Object, Object)
	*/
	public void update() {

	boolean wasEnabled= isEnabled();
	boolean isEnabled= (fOperationTarget != null && fOperationTarget.canDoOperation(fOperationCode));
	setEnabled(isEnabled);

	if (wasEnabled != isEnabled) {
	firePropertyChange(ENABLED, wasEnabled ? Boolean.TRUE : Boolean.FALSE, isEnabled ? Boolean.TRUE : Boolean.FALSE);
	}
	}

	/**
	* @see Action#run()
	*/
	public void run() {
	if (fOperationCode != -1 && fOperationTarget != null) {
	fOperationTarget.doOperation(fOperationCode);
	}
	}
	}

	private final Template fTemplate;

	private Text fNameText;
	private Text fDescriptionText;
	private Combo fContextCombo;
	private SourceViewer fPatternEditor;
	private Button fInsertVariableButton;
	private boolean fIsNameModifiable;

	private StatusInfo fValidationStatus;
	private boolean fSuppressError= true; // #4354
	private Map fGlobalActions= new HashMap(10);
	private List fSelectionActions = new ArrayList(3);
	private String[][] fContextTypes;

	private ContextTypeRegistry fContextTypeRegistry;

	private final TemplateVariableProcessor fTemplateProcessor= new TemplateVariableProcessor();

	/**
	* Creates a new dialog.
	*
	* @param parent the shell parent of the dialog
	* @param template the template to edit
	* @param edit whether this is a new template or an existing being edited
	* @param isNameModifiable whether the name of the template may be modified
	* @param registry the context type registry to use
	*/
	public EditTemplateDialog(Shell parent, Template template, boolean edit, boolean isNameModifiable, ContextTypeRegistry registry) {
	super(parent);

	setShellStyle(getShellStyle() \| SWT.MAX \| SWT.RESIZE);

	String title= edit
	? TextEditorTemplateMessages.getString("EditTemplateDialog.title.edit") //$NON-NLS-1$
	: TextEditorTemplateMessages.getString("EditTemplateDialog.title.new"); //$NON-NLS-1$
	setTitle(title);

	fTemplate= template;
	fIsNameModifiable= isNameModifiable;

	List contexts= new ArrayList();
	for (Iterator it= registry.contextTypes(); it.hasNext();) {
	TemplateContextType type= (TemplateContextType) it.next();
	contexts.add(new String[] { type.getId(), type.getName() });
	}
	fContextTypes= (String[][]) contexts.toArray(new String[contexts.size()][]);

	fValidationStatus= new StatusInfo();

	fContextTypeRegistry= registry;

	TemplateContextType type= fContextTypeRegistry.getContextType(template.getContextTypeId());
	fTemplateProcessor.setContextType(type);
	}

	/*
	* @see org.eclipse.ui.texteditor.templates.StatusDialog#create()
	*/
	public void create() {
	super.create();
	// update initial ok button to be disabled for new templates
	boolean valid= fNameText == null \|\| fNameText.getText().trim().length() != 0;
	if (!valid) {
	StatusInfo status = new StatusInfo();
	status.setError(TextEditorTemplateMessages.getString("EditTemplateDialog.error.noname")); //$NON-NLS-1$
	updateButtonsEnableState(status);
	}
	}

	/*
	* @see Dialog#createDialogArea(Composite)
	*/
	protected Control createDialogArea(Composite ancestor) {
	Composite parent= new Composite(ancestor, SWT.NONE);
	GridLayout layout= new GridLayout();
	layout.numColumns= 2;
	parent.setLayout(layout);
	parent.setLayoutData(new GridData(GridData.FILL_BOTH));

	ModifyListener listener= new ModifyListener() {
	public void modifyText(ModifyEvent e) {
	doTextWidgetChanged(e.widget);
	}
	};

	if (fIsNameModifiable) {
	createLabel(parent, TextEditorTemplateMessages.getString("EditTemplateDialog.name")); //$NON-NLS-1$

	Composite composite= new Composite(parent, SWT.NONE);
	composite.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
	layout= new GridLayout();
	layout.numColumns= 3;
	layout.marginWidth= 0;
	layout.marginHeight= 0;
	composite.setLayout(layout);

	fNameText= createText(composite);
	fNameText.addModifyListener(listener);
	fNameText.addFocusListener(new FocusListener() {

	public void focusGained(FocusEvent e) {
	}

	public void focusLost(FocusEvent e) {
	if (fSuppressError) {
	fSuppressError= false;
	updateButtons();
	}
	}
	});

	createLabel(composite, TextEditorTemplateMessages.getString("EditTemplateDialog.context")); //$NON-NLS-1$
	fContextCombo= new Combo(composite, SWT.READ_ONLY);

	for (int i= 0; i < fContextTypes.length; i++) {
	fContextCombo.add(fContextTypes[i][1]);
	}

	fContextCombo.addModifyListener(listener);
	}

	createLabel(parent, TextEditorTemplateMessages.getString("EditTemplateDialog.description")); //$NON-NLS-1$

	int descFlags= fIsNameModifiable ? SWT.BORDER : SWT.BORDER \| SWT.READ_ONLY;
	fDescriptionText= new Text(parent, descFlags );
	fDescriptionText.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

	fDescriptionText.addModifyListener(listener);

	Label patternLabel= createLabel(parent, TextEditorTemplateMessages.getString("EditTemplateDialog.pattern")); //$NON-NLS-1$
	patternLabel.setLayoutData(new GridData(GridData.VERTICAL_ALIGN_BEGINNING));
	fPatternEditor= createEditor(parent);

	Label filler= new Label(parent, SWT.NONE);
	filler.setLayoutData(new GridData());

	Composite composite= new Composite(parent, SWT.NONE);
	layout= new GridLayout();
	layout.marginWidth= 0;
	layout.marginHeight= 0;
	composite.setLayout(layout);
	composite.setLayoutData(new GridData());

	fInsertVariableButton= new Button(composite, SWT.NONE);
	fInsertVariableButton.setLayoutData(getButtonGridData(fInsertVariableButton));
	fInsertVariableButton.setText(TextEditorTemplateMessages.getString("EditTemplateDialog.insert.variable")); //$NON-NLS-1$
	fInsertVariableButton.addSelectionListener(new SelectionListener() {
	public void widgetSelected(SelectionEvent e) {
	fPatternEditor.getTextWidget().setFocus();
	fPatternEditor.doOperation(ISourceViewer.CONTENTASSIST_PROPOSALS);
	}

	public void widgetDefaultSelected(SelectionEvent e) {}
	});

	fDescriptionText.setText(fTemplate.getDescription());
	if (fIsNameModifiable) {
	fNameText.setText(fTemplate.getName());
	fNameText.addModifyListener(listener);
	fContextCombo.select(getIndex(fTemplate.getContextTypeId()));
	} else {
	fPatternEditor.getControl().setFocus();
	}
	initializeActions();

	applyDialogFont(parent);
	return composite;
	}

	private void doTextWidgetChanged(Widget w) {
	if (w == fNameText) {
	fSuppressError= false;
	String name= fNameText.getText();
	fTemplate.setName(name);
	updateButtons();
	} else if (w == fContextCombo) {
	String name= fContextCombo.getText();
	String contextId= getContextId(name);
	fTemplate.setContextTypeId(contextId);
	fTemplateProcessor.setContextType(fContextTypeRegistry.getContextType(contextId));
	} else if (w == fDescriptionText) {
	String desc= fDescriptionText.getText();
	fTemplate.setDescription(desc);
	}
	}

	private String getContextId(String name) {
	if (name == null)
	return name;

	for (int i= 0; i < fContextTypes.length; i++) {
	if (name.equals(fContextTypes[i][1])) {
	return fContextTypes[i][0];
	}
	}
	return name;
	}

	private void doSourceChanged(IDocument document) {
	String text= document.get();
	fTemplate.setPattern(text);
	fValidationStatus.setOK();
	TemplateContextType contextType= fContextTypeRegistry.getContextType(fTemplate.getContextTypeId());
	if (contextType != null) {
	try {
	contextType.validate(text);
	} catch (TemplateException e) {
	fValidationStatus.setError(e.getLocalizedMessage());
	}
	}

	updateUndoAction();
	updateButtons();
	}

	private static GridData getButtonGridData(Button button) {
	GridData data= new GridData(GridData.FILL_HORIZONTAL);
	// TODO get some button hints.
	// data.heightHint= SWTUtil.getButtonHeightHint(button);

	return data;
	}

	private static Label createLabel(Composite parent, String name) {
	Label label= new Label(parent, SWT.NULL);
	label.setText(name);
	label.setLayoutData(new GridData());

	return label;
	}

	private static Text createText(Composite parent) {
	Text text= new Text(parent, SWT.BORDER);
	text.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

	return text;
	}

	private SourceViewer createEditor(Composite parent) {
	SourceViewer viewer= createViewer(parent);

	IDocument document= new Document(fTemplate.getPattern());
	viewer.setEditable(true);
	viewer.setDocument(document);


	int nLines= document.getNumberOfLines();
	if (nLines < 5) {
	nLines= 5;
	} else if (nLines > 12) {
	nLines= 12;
	}

	Control control= viewer.getControl();
	GridData data= new GridData(GridData.FILL_BOTH);
	data.widthHint= convertWidthInCharsToPixels(80);
	data.heightHint= convertHeightInCharsToPixels(nLines);
	control.setLayoutData(data);

	viewer.addTextListener(new ITextListener() {
	public void textChanged(TextEvent event) {
	if (event .getDocumentEvent() != null)
	doSourceChanged(event.getDocumentEvent().getDocument());
	}
	});

	viewer.addSelectionChangedListener(new ISelectionChangedListener() {
	public void selectionChanged(SelectionChangedEvent event) {
	updateSelectionDependentActions();
	}
	});

	viewer.prependVerifyKeyListener(new VerifyKeyListener() {
	public void verifyKey(VerifyEvent event) {
	handleVerifyKeyPressed(event);
	}
	});

	return viewer;
	}

	/**
	* Creates the viewer to be used to display the pattern. Subclasses may override.
	*
	* @param parent the parent composite of the viewer
	* @return a configured <code>SourceViewer</code>
	*/
	protected SourceViewer createViewer(Composite parent) {
	SourceViewer viewer= new SourceViewer(parent, null, null, false, SWT.BORDER \| SWT.V_SCROLL \| SWT.H_SCROLL);
	SourceViewerConfiguration configuration= new SourceViewerConfiguration() {
	public IContentAssistant getContentAssistant(ISourceViewer sourceViewer) {

	ContentAssistant assistant= new ContentAssistant();
	assistant.enableAutoActivation(true);
	assistant.enableAutoInsert(true);
	assistant.setContentAssistProcessor(fTemplateProcessor, IDocument.DEFAULT_CONTENT_TYPE);
	return assistant;
	}
	};
	viewer.configure(configuration);
	return viewer;
	}

	private void handleVerifyKeyPressed(VerifyEvent event) {
	if (!event.doit)
	return;

	if (event.stateMask != SWT.MOD1)
	return;

	switch (event.character) {
	case ' ':
	fPatternEditor.doOperation(ISourceViewer.CONTENTASSIST_PROPOSALS);
	event.doit= false;
	break;

	// CTRL-Z
	case 'z' - 'a' + 1:
	fPatternEditor.doOperation(ITextOperationTarget.UNDO);
	event.doit= false;
	break;
	}
	}

	private void initializeActions() {
	TextViewerAction action= new TextViewerAction(fPatternEditor, ITextOperationTarget.UNDO);
	action.setText(TextEditorTemplateMessages.getString("EditTemplateDialog.undo")); //$NON-NLS-1$
	fGlobalActions.put(ITextEditorActionConstants.UNDO, action);

	action= new TextViewerAction(fPatternEditor, ITextOperationTarget.CUT);
	action.setText(TextEditorTemplateMessages.getString("EditTemplateDialog.cut")); //$NON-NLS-1$
	fGlobalActions.put(ITextEditorActionConstants.CUT, action);

	action= new TextViewerAction(fPatternEditor, ITextOperationTarget.COPY);
	action.setText(TextEditorTemplateMessages.getString("EditTemplateDialog.copy")); //$NON-NLS-1$
	fGlobalActions.put(ITextEditorActionConstants.COPY, action);

	action= new TextViewerAction(fPatternEditor, ITextOperationTarget.PASTE);
	action.setText(TextEditorTemplateMessages.getString("EditTemplateDialog.paste")); //$NON-NLS-1$
	fGlobalActions.put(ITextEditorActionConstants.PASTE, action);

	action= new TextViewerAction(fPatternEditor, ITextOperationTarget.SELECT_ALL);
	action.setText(TextEditorTemplateMessages.getString("EditTemplateDialog.select.all")); //$NON-NLS-1$
	fGlobalActions.put(ITextEditorActionConstants.SELECT_ALL, action);

	action= new TextViewerAction(fPatternEditor, ISourceViewer.CONTENTASSIST_PROPOSALS);
	action.setText(TextEditorTemplateMessages.getString("EditTemplateDialog.content.assist")); //$NON-NLS-1$
	fGlobalActions.put("ContentAssistProposal", action); //$NON-NLS-1$

	fSelectionActions.add(ITextEditorActionConstants.CUT);
	fSelectionActions.add(ITextEditorActionConstants.COPY);
	fSelectionActions.add(ITextEditorActionConstants.PASTE);

	// create context menu
	MenuManager manager= new MenuManager(null, null);
	manager.setRemoveAllWhenShown(true);
	manager.addMenuListener(new IMenuListener() {
	public void menuAboutToShow(IMenuManager mgr) {
	fillContextMenu(mgr);
	}
	});

	StyledText text= fPatternEditor.getTextWidget();
	Menu menu= manager.createContextMenu(text);
	text.setMenu(menu);
	}

	private void fillContextMenu(IMenuManager menu) {
	menu.add(new GroupMarker(ITextEditorActionConstants.GROUP_UNDO));
	menu.appendToGroup(ITextEditorActionConstants.GROUP_UNDO, (IAction) fGlobalActions.get(ITextEditorActionConstants.UNDO));

	menu.add(new Separator(ITextEditorActionConstants.GROUP_EDIT));
	menu.appendToGroup(ITextEditorActionConstants.GROUP_EDIT, (IAction) fGlobalActions.get(ITextEditorActionConstants.CUT));
	menu.appendToGroup(ITextEditorActionConstants.GROUP_EDIT, (IAction) fGlobalActions.get(ITextEditorActionConstants.COPY));
	menu.appendToGroup(ITextEditorActionConstants.GROUP_EDIT, (IAction) fGlobalActions.get(ITextEditorActionConstants.PASTE));
	menu.appendToGroup(ITextEditorActionConstants.GROUP_EDIT, (IAction) fGlobalActions.get(ITextEditorActionConstants.SELECT_ALL));

	menu.add(new Separator("templates")); //$NON-NLS-1$
	menu.appendToGroup("templates", (IAction) fGlobalActions.get("ContentAssistProposal")); //$NON-NLS-1$ //$NON-NLS-2$
	}

	private void updateSelectionDependentActions() {
	Iterator iterator= fSelectionActions.iterator();
	while (iterator.hasNext())
	updateAction((String)iterator.next());
	}

	private void updateUndoAction() {
	IAction action= (IAction) fGlobalActions.get(ITextEditorActionConstants.UNDO);
	if (action instanceof IUpdate)
	((IUpdate) action).update();
	}

	private void updateAction(String actionId) {
	IAction action= (IAction) fGlobalActions.get(actionId);
	if (action instanceof IUpdate)
	((IUpdate) action).update();
	}

	private int getIndex(String contextid) {

	if (contextid == null)
	return -1;

	for (int i= 0; i < fContextTypes.length; i++) {
	if (contextid.equals(fContextTypes[i][0])) {
	return i;
	}
	}
	return -1;
	}

	private void updateButtons() {
	StatusInfo status;

	boolean valid= fNameText == null \|\| fNameText.getText().trim().length() != 0;
	if (!valid) {
	status = new StatusInfo();
	if (!fSuppressError) {
	status.setError(TextEditorTemplateMessages.getString("EditTemplateDialog.error.noname")); //$NON-NLS-1$
	}
	} else {
	status= fValidationStatus;
	}
	updateStatus(status);
	}

	}