bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/internal/dialogs/FileEditorsPreferencePage.java - platform/eclipse.platform.ui - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2003 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.internal.dialogs;

 import java.util.*;

 import org.eclipse.jface.dialogs.Dialog;
 import org.eclipse.jface.dialogs.MessageDialog;
 import org.eclipse.jface.preference.IPreferenceStore;
 import org.eclipse.jface.preference.PreferencePage;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.graphics.Font;
 import org.eclipse.swt.graphics.Image;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Event;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Listener;
 import org.eclipse.swt.widgets.Table;
 import org.eclipse.swt.widgets.TableItem;
 import org.eclipse.ui.*;
 import org.eclipse.ui.help.WorkbenchHelp;
 import org.eclipse.ui.internal.*;
 import org.eclipse.ui.internal.misc.Assert;
 import org.eclipse.ui.internal.registry.*;


 /**
  * The file editors page presents the collection of file names and extensions
  * for which the user has registered editors. It also lets the user add new
  * internal or external (program) editors for a given file name and extension.
  *
  * The user can add an editor for either a specific file name and extension
  * (e.g. report.doc), or for all file names of a given extension (e.g. *.doc)
  *
  * The set of registered editors is tracked by the EditorRegistery
  * available from the workbench plugin.
  */
 public class FileEditorsPreferencePage extends PreferencePage implements IWorkbenchPreferencePage, Listener {
 	protected Table resourceTypeTable;
 	protected Button addResourceTypeButton;
 	protected Button removeResourceTypeButton;
 	protected Table editorTable;
 	protected Button addEditorButton;
 	protected Button removeEditorButton;
 	protected Button defaultEditorButton;
 	protected Label editorLabel;

 	protected IWorkbench workbench;
 	protected List imagesToDispose;
 	protected Map editorsToImages;
 /**
  * Add a new resource type to the collection shown in the top of the page.
  * This is typically called after the extension dialog is shown to the user.
  */
 public void addResourceType(String newName, String newExtension) {
 	// Either a file name or extension must be provided
 	Assert.isTrue((newName != null && newName.length() != 0) ||
 		(newExtension != null && newExtension.length() != 0));

 	// Wild card only valid by itself (i.e. rep* is not valid)
 	// And must have an extension
 	int index = newName.indexOf('*');
 	if (index > -1) {
 		Assert.isTrue(index == 0 && newName.length() == 1);
 		Assert.isTrue(newExtension != null && newExtension.length() != 0);
 	}

 	// Find the index at which to insert the new entry.
 	String newFilename = (newName + (newExtension == null || newExtension.length() == 0 ?
 		 "" : "." + newExtension)).toUpperCase();//$NON-NLS-1$ //$NON-NLS-2$
 	IFileEditorMapping resourceType;
 	TableItem[] items = resourceTypeTable.getItems();
 	boolean found = false;
 	int i = 0;

 	while (i < items.length && !found) {
 		resourceType = (IFileEditorMapping) items[i].getData();
 		int result = newFilename.compareToIgnoreCase(resourceType.getLabel());
 		if (result == 0) {
 			// Same resource type not allowed!
 			MessageDialog.openInformation(
 				getControl().getShell(),
 				WorkbenchMessages.getString("FileEditorPreference.existsTitle"), //$NON-NLS-1$
 				WorkbenchMessages.getString("FileEditorPreference.existsMessage")); //$NON-NLS-1$
 			return;
 		}

 		if (result < 0)
 			found = true;
 		else
 			i++;
 	}

 	// Create the new type and insert it
 	resourceType = new FileEditorMapping(newName, newExtension);
 	TableItem item = newResourceTableItem(resourceType, i, true);
 	resourceTypeTable.setFocus();
 	resourceTypeTable.showItem(item);
 	fillEditorTable();
 }
 /**
  * Creates the page's UI content.
  */
 protected Control createContents(Composite parent) {
 	imagesToDispose = new ArrayList();
 	editorsToImages = new HashMap(50);
 	Font font = parent.getFont();

 	// define container & its gridding
 	Composite pageComponent = new Composite(parent, SWT.NULL);
 	GridLayout layout = new GridLayout();
 	layout.numColumns = 2;
 	layout.marginWidth = 0;
 	layout.marginHeight = 0;
 	pageComponent.setLayout(layout);
 	GridData data = new GridData();
 	data.verticalAlignment = GridData.FILL;
 	data.horizontalAlignment = GridData.FILL;
 	pageComponent.setLayoutData(data);
 	pageComponent.setFont(font);

 	//layout the contents

 	//layout the top table & its buttons
 	Label label = new Label(pageComponent, SWT.LEFT);
 	label.setText(WorkbenchMessages.getString("FileEditorPreference.fileTypes")); //$NON-NLS-1$
 	data = new GridData();
 	data.horizontalAlignment = GridData.FILL;
 	data.horizontalSpan = 2;
 	label.setLayoutData(data);
 	label.setFont(font);

 	resourceTypeTable = new Table(pageComponent, SWT.SINGLE | SWT.BORDER | SWT.FULL_SELECTION);
 	resourceTypeTable.addListener(SWT.Selection, this);
 	resourceTypeTable.addListener(SWT.DefaultSelection, this);
 	data = new GridData(GridData.FILL_HORIZONTAL);

 	int availableRows = DialogUtil.availableRows(pageComponent);

 	data.heightHint = resourceTypeTable.getItemHeight()* (availableRows / 8);
 	resourceTypeTable.setLayoutData(data);
 	resourceTypeTable.setFont(font);

 	Composite groupComponent= new Composite(pageComponent, SWT.NULL);
 	GridLayout groupLayout = new GridLayout();
 	groupLayout.marginWidth = 0;
 	groupLayout.marginHeight = 0;
 	groupComponent.setLayout(groupLayout);
 	data = new GridData();
 	data.verticalAlignment = GridData.FILL;
 	data.horizontalAlignment = GridData.FILL;
 	groupComponent.setLayoutData(data);
 	groupComponent.setFont(font);

 	addResourceTypeButton = new Button(groupComponent, SWT.PUSH);
 	addResourceTypeButton.setText(WorkbenchMessages.getString("FileEditorPreference.add")); //$NON-NLS-1$
 	addResourceTypeButton.addListener(SWT.Selection, this);
 	addResourceTypeButton.setLayoutData(data);
 	addResourceTypeButton.setFont(font);
 	setButtonLayoutData(addResourceTypeButton);


 	removeResourceTypeButton = new Button(groupComponent, SWT.PUSH);
 	removeResourceTypeButton.setText(WorkbenchMessages.getString("FileEditorPreference.remove")); //$NON-NLS-1$
 	removeResourceTypeButton.addListener(SWT.Selection, this);
 	removeResourceTypeButton.setFont(font);
 	setButtonLayoutData(removeResourceTypeButton);

 	//Spacer
 	label = new Label(pageComponent, SWT.LEFT);
 	data = new GridData();
 	data.horizontalAlignment = GridData.FILL;
 	data.horizontalSpan = 2;
 	label.setLayoutData(data);

 	// layout the bottom table & its buttons
 	editorLabel = new Label(pageComponent, SWT.LEFT);
 	editorLabel.setText(WorkbenchMessages.getString("FileEditorPreference.associatedEditors")); //$NON-NLS-1$
 	data = new GridData();
 	data.horizontalAlignment = GridData.FILL;
 	data.horizontalSpan = 2;
 	editorLabel.setLayoutData(data);
 	editorLabel.setFont(font);

 	editorTable = new Table(pageComponent, SWT.SINGLE | SWT.BORDER);
 	editorTable.addListener(SWT.Selection, this);
 	editorTable.addListener(SWT.DefaultSelection, this);
 	data = new GridData(GridData.FILL_BOTH);
 	data.heightHint = editorTable.getItemHeight()*7;
 	editorTable.setLayoutData(data);
 	editorTable.setFont(font);

 	groupComponent = new Composite(pageComponent, SWT.NULL);
 	groupLayout = new GridLayout();
 	groupLayout.marginWidth = 0;
 	groupLayout.marginHeight = 0;
 	groupComponent.setLayout(groupLayout);
 	data = new GridData();
 	data.verticalAlignment = GridData.FILL;
 	data.horizontalAlignment = GridData.FILL;
 	groupComponent.setLayoutData(data);
 	groupComponent.setFont(font);

 	addEditorButton = new Button(groupComponent, SWT.PUSH);
 	addEditorButton.setText(WorkbenchMessages.getString("FileEditorPreference.addEditor")); //$NON-NLS-1$
 	addEditorButton.addListener(SWT.Selection, this);
 	addEditorButton.setLayoutData(data);
 	addEditorButton.setFont(font);
 	setButtonLayoutData(addEditorButton);

 	removeEditorButton = new Button(groupComponent, SWT.PUSH);
 	removeEditorButton.setText(WorkbenchMessages.getString("FileEditorPreference.removeEditor")); //$NON-NLS-1$
 	removeEditorButton.addListener(SWT.Selection, this);
 	removeEditorButton.setFont(font);
 	setButtonLayoutData(removeEditorButton);

 	defaultEditorButton= new Button(groupComponent, SWT.PUSH);
 	defaultEditorButton.setText(WorkbenchMessages.getString("FileEditorPreference.default")); //$NON-NLS-1$
 	defaultEditorButton.addListener(SWT.Selection, this);
 	defaultEditorButton.setFont(font);
 	setButtonLayoutData(defaultEditorButton);

 	fillResourceTypeTable();
 	if (resourceTypeTable.getItemCount() > 0) {
 		resourceTypeTable.setSelection(0);
 	}
 	fillEditorTable();
 	updateEnabledState();

 	WorkbenchHelp.setHelp(parent, IHelpContextIds.FILE_EDITORS_PREFERENCE_PAGE);

 	return pageComponent;
 }
 /**
  * The preference page is going to be disposed. So deallocate all allocated
  * SWT resources that aren't disposed automatically by disposing the page
  * (i.e fonts, cursors, etc). Subclasses should reimplement this method to
  * release their own allocated SWT resources.
  */
 public void dispose() {
 	super.dispose();
 	if(imagesToDispose != null) {
 		for (Iterator e = imagesToDispose.iterator(); e.hasNext();) {
 			((Image)e.next()).dispose();
 		}
 		imagesToDispose = null;
 	}
 	if (editorsToImages != null) {
 		for (Iterator e = editorsToImages.values().iterator(); e.hasNext();) {
 			((Image)e.next()).dispose();
 		}
 		editorsToImages = null;
 	}
 }

 /**
  * Hook method to get a page specific preference store. Reimplement this
  * method if a page don't want to use its parent's preference store.
  */
 protected IPreferenceStore doGetPreferenceStore() {
 	return WorkbenchPlugin.getDefault().getPreferenceStore();
 }
 protected void fillEditorTable() {
 	editorTable.removeAll();
 	FileEditorMapping resourceType = getSelectedResourceType();
 	if (resourceType != null) {
 		IEditorDescriptor[] array = resourceType.getEditors();
 		for (int i=0;i < array.length; i++) {
 			IEditorDescriptor editor = array[i];
 			TableItem item = new TableItem(editorTable, SWT.NULL);
 			item.setData(editor);
 			// Check if it is the default editor
 			String defaultString = null;
 			FileEditorMapping ext = getSelectedResourceType();
 			if (ext != null){
 				IEditorDescriptor preferredEditor = ext.getDefaultEditor();
 				if (preferredEditor == editor)
 					defaultString = WorkbenchMessages.getString("FileEditorPreference.defaultLabel"); //$NON-NLS-1$
 			}

 			if (defaultString != null) {
 				item.setText(editor.getLabel() + " " + defaultString); //$NON-NLS-1$
 			}
 			else {
 				item.setText(editor.getLabel());
 			}
 			item.setImage(getImage(editor));
 		}
 	}
 }
 /**
  * Place the existing resource types in the table
  */
 protected void fillResourceTypeTable() {
 	// Populate the table with the items
 	IFileEditorMapping[] array = WorkbenchPlugin.getDefault().getEditorRegistry().getFileEditorMappings();
 	for (int i = 0; i < array.length; i++) {
 		FileEditorMapping mapping = (FileEditorMapping) array[i];
 		mapping = (FileEditorMapping) mapping.clone(); // want a copy
 		newResourceTableItem(mapping, i, false);
 	}
 }
 /**
  * Returns the image associated with the given editor.
  */
 protected Image getImage(IEditorDescriptor editor) {
 	Image image = (Image)editorsToImages.get(editor);
 	if (image == null) {
 		image = editor.getImageDescriptor().createImage();
 		editorsToImages.put(editor, image);
 	}
 	return image;
 }
 protected FileEditorMapping getSelectedResourceType() {
 	TableItem[] items = resourceTypeTable.getSelection();
 	if (items.length > 0) {
 		return (FileEditorMapping)items[0].getData();  //Table is single select
 	} else {
 		return null;
 	}
 }
 protected IEditorDescriptor[] getAssociatedEditors(){
 	if (getSelectedResourceType() == null)
 		return null;
 	if (editorTable.getItemCount() > 0) {
 		ArrayList editorList = new ArrayList();
 		for (int i = 0; i < editorTable.getItemCount(); i++)
 			editorList.add(editorTable.getItem(i).getData());

 		return (IEditorDescriptor[])editorList.toArray(new IEditorDescriptor[editorList.size()]);
 	}
 	else
 		return null;
 }
 public void handleEvent(Event event) {
 	if (event.widget == addResourceTypeButton) {
 		promptForResourceType();
 	} else if (event.widget == removeResourceTypeButton) {
 		removeSelectedResourceType();
 	} else if (event.widget == addEditorButton) {
 		promptForEditor();
 	} else if (event.widget == removeEditorButton) {
 		removeSelectedEditor();
 	} else if (event.widget == defaultEditorButton) {
 		setSelectedEditorAsDefault();
 	} else if (event.widget == resourceTypeTable) {
 		fillEditorTable();
 	}

 	updateEnabledState();

 }
 /**
  * @see IWorkbenchPreferencePage
  */
 public void init(IWorkbench aWorkbench){
 	this.workbench = aWorkbench;
 	noDefaultAndApplyButton();
 }
 /*
  * Create a new <code>TableItem</code> to represent the resource
  * type editor description supplied.
  */
 protected TableItem newResourceTableItem(IFileEditorMapping mapping, int index, boolean selected) {
 	Image image = mapping.getImageDescriptor().createImage(false);
 	if (image != null)
 		imagesToDispose.add(image);

 	TableItem item = new TableItem(resourceTypeTable, SWT.NULL, index);
 	if (image != null) {
 		item.setImage(image);
 	}
 	item.setText(mapping.getLabel());
 	item.setData(mapping);
 	if (selected) {
 		resourceTypeTable.setSelection(index);
 	}

 	return item;
 }
 /**
  * This is a hook for sublcasses to do special things when the ok
  * button is pressed.
  * For example reimplement this method if you want to save the
  * page's data into the preference bundle.
  */
 public boolean performOk() {
 	TableItem[] items = resourceTypeTable.getItems();
 	FileEditorMapping[] resourceTypes = new FileEditorMapping[items.length];
 	for (int i = 0; i < items.length; i++) {
 		resourceTypes[i] = (FileEditorMapping)(items[i].getData());
 	}
 	EditorRegistry registry = (EditorRegistry)WorkbenchPlugin.getDefault().getEditorRegistry(); // cast to allow save to be called
 	registry.setFileEditorMappings(resourceTypes);
 	registry.saveAssociations();
 	return true;
 }
 public void promptForEditor() {
 	EditorSelectionDialog dialog = new EditorSelectionDialog(getControl().getShell());
 	dialog.setEditorsToFilter(getAssociatedEditors());
 	dialog.setMessage(WorkbenchMessages.format("Choose_the_editor_for_file", new Object[] {getSelectedResourceType().getLabel()})); //$NON-NLS-1$
 	if (dialog.open() == Dialog.OK) {
 		EditorDescriptor editor = (EditorDescriptor)dialog.getSelectedEditor();
 		if (editor != null) {
 			int i = editorTable.getItemCount();
 			boolean isEmpty = i < 1;
 			TableItem item = new TableItem(editorTable, SWT.NULL, i);
 			item.setData(editor);
 			if (isEmpty)
 				item.setText(editor.getLabel() + " " + 	WorkbenchMessages.getString("FileEditorPreference.defaultLabel")); //$NON-NLS-2$ //$NON-NLS-1$
 			else
 				item.setText(editor.getLabel());
 			item.setImage(getImage(editor));
 			editorTable.setSelection(i);
 			editorTable.setFocus();
 			getSelectedResourceType().addEditor(editor);
 			updateSelectedResourceType(); //in case of new default
 		}
 	}
 }
 public void promptForResourceType() {
 	FileExtensionDialog dialog = new FileExtensionDialog(getControl().getShell());
 	if (dialog.open() == Dialog.OK) {
 		String name = dialog.getName();
 		String extension = dialog.getExtension();
 		addResourceType(name, extension);
 	}
 }
 /**
  * Remove the editor from the table
  */
 public void removeSelectedEditor() {
 	TableItem[] items = editorTable.getSelection();
 	boolean defaultEditor = editorTable.getSelectionIndex() == 0;
 	if (items.length > 0) {
 		getSelectedResourceType().removeEditor((EditorDescriptor)items[0].getData());
 		items[0].dispose();  //Table is single selection
 	}
 	if (defaultEditor && editorTable.getItemCount() > 0){
 		TableItem item = editorTable.getItem(0);
 		if (item != null)
 			item.setText(((EditorDescriptor)(item.getData())).getLabel() + " " + 	WorkbenchMessages.getString("FileEditorPreference.defaultLabel"));  //$NON-NLS-2$ //$NON-NLS-1$
 	}

 }
 /**
  * Remove the type from the table
  */
 public void removeSelectedResourceType() {
 	TableItem[] items = resourceTypeTable.getSelection();
 	if (items.length > 0) {
 		items[0].dispose();  //Table is single selection
 	}
 	//Clear out the editors too
 	editorTable.removeAll();
 }
 public void setSelectedEditorAsDefault() {
 	TableItem[] items = editorTable.getSelection();
 	if (items.length > 0) {
 		// First change the label of the old default
 		TableItem oldDefaultItem = editorTable.getItem(0);
 		oldDefaultItem.setText(((EditorDescriptor)oldDefaultItem.getData()).getLabel());
 		// Now set the new default
 		EditorDescriptor editor = (EditorDescriptor)items[0].getData();
 		getSelectedResourceType().setDefaultEditor(editor);
 		items[0].dispose();  //Table is single selection
 		TableItem item = new TableItem(editorTable, SWT.NULL, 0);
 		item.setData(editor);
 		item.setText(editor.getLabel() + " " + 	WorkbenchMessages.getString("FileEditorPreference.defaultLabel")); //$NON-NLS-2$ //$NON-NLS-1$
 		item.setImage(getImage(editor));
 		editorTable.setSelection(new TableItem[] {item});
 	}
 }
 public void updateEnabledState() {
 	//Update enabled state
 	boolean resourceTypeSelected = resourceTypeTable.getSelectionIndex() != -1;
 	boolean editorSelected = editorTable.getSelectionIndex() != -1;

 	removeResourceTypeButton.setEnabled(resourceTypeSelected);
 	editorLabel.setEnabled(resourceTypeSelected);
 	addEditorButton.setEnabled(resourceTypeSelected);
 	removeEditorButton.setEnabled(editorSelected);
 	defaultEditorButton.setEnabled(editorSelected);
 }
 public void updateSelectedResourceType() {
 //  TableItem item = resourceTypeTable.getSelection()[0]; //Single select
 //  Image image = ((IFileEditorMapping)item.getData()).getImageDescriptor().getImage();
 //  imagesToDispose.addElement(image);
 //  item.setImage(image);
 }
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2003 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.internal.dialogs;

	import java.util.*;

	import org.eclipse.jface.dialogs.Dialog;
	import org.eclipse.jface.dialogs.MessageDialog;
	import org.eclipse.jface.preference.IPreferenceStore;
	import org.eclipse.jface.preference.PreferencePage;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.graphics.Font;
	import org.eclipse.swt.graphics.Image;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.layout.GridLayout;
	import org.eclipse.swt.widgets.Button;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.swt.widgets.Event;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Listener;
	import org.eclipse.swt.widgets.Table;
	import org.eclipse.swt.widgets.TableItem;
	import org.eclipse.ui.*;
	import org.eclipse.ui.help.WorkbenchHelp;
	import org.eclipse.ui.internal.*;
	import org.eclipse.ui.internal.misc.Assert;
	import org.eclipse.ui.internal.registry.*;


	/**
	* The file editors page presents the collection of file names and extensions
	* for which the user has registered editors. It also lets the user add new
	* internal or external (program) editors for a given file name and extension.
	*
	* The user can add an editor for either a specific file name and extension
	* (e.g. report.doc), or for all file names of a given extension (e.g. *.doc)
	*
	* The set of registered editors is tracked by the EditorRegistery
	* available from the workbench plugin.
	*/
	public class FileEditorsPreferencePage extends PreferencePage implements IWorkbenchPreferencePage, Listener {
	protected Table resourceTypeTable;
	protected Button addResourceTypeButton;
	protected Button removeResourceTypeButton;
	protected Table editorTable;
	protected Button addEditorButton;
	protected Button removeEditorButton;
	protected Button defaultEditorButton;
	protected Label editorLabel;

	protected IWorkbench workbench;
	protected List imagesToDispose;
	protected Map editorsToImages;
	/**
	* Add a new resource type to the collection shown in the top of the page.
	* This is typically called after the extension dialog is shown to the user.
	*/
	public void addResourceType(String newName, String newExtension) {
	// Either a file name or extension must be provided
	Assert.isTrue((newName != null && newName.length() != 0) \|\|
	(newExtension != null && newExtension.length() != 0));

	// Wild card only valid by itself (i.e. rep* is not valid)
	// And must have an extension
	int index = newName.indexOf('*');
	if (index > -1) {
	Assert.isTrue(index == 0 && newName.length() == 1);
	Assert.isTrue(newExtension != null && newExtension.length() != 0);
	}

	// Find the index at which to insert the new entry.
	String newFilename = (newName + (newExtension == null \|\| newExtension.length() == 0 ?
	"" : "." + newExtension)).toUpperCase();//$NON-NLS-1$ //$NON-NLS-2$
	IFileEditorMapping resourceType;
	TableItem[] items = resourceTypeTable.getItems();
	boolean found = false;
	int i = 0;

	while (i < items.length && !found) {
	resourceType = (IFileEditorMapping) items[i].getData();
	int result = newFilename.compareToIgnoreCase(resourceType.getLabel());
	if (result == 0) {
	// Same resource type not allowed!
	MessageDialog.openInformation(
	getControl().getShell(),
	WorkbenchMessages.getString("FileEditorPreference.existsTitle"), //$NON-NLS-1$
	WorkbenchMessages.getString("FileEditorPreference.existsMessage")); //$NON-NLS-1$
	return;
	}

	if (result < 0)
	found = true;
	else
	i++;
	}

	// Create the new type and insert it
	resourceType = new FileEditorMapping(newName, newExtension);
	TableItem item = newResourceTableItem(resourceType, i, true);
	resourceTypeTable.setFocus();
	resourceTypeTable.showItem(item);
	fillEditorTable();
	}
	/**
	* Creates the page's UI content.
	*/
	protected Control createContents(Composite parent) {
	imagesToDispose = new ArrayList();
	editorsToImages = new HashMap(50);
	Font font = parent.getFont();

	// define container & its gridding
	Composite pageComponent = new Composite(parent, SWT.NULL);
	GridLayout layout = new GridLayout();
	layout.numColumns = 2;
	layout.marginWidth = 0;
	layout.marginHeight = 0;
	pageComponent.setLayout(layout);
	GridData data = new GridData();
	data.verticalAlignment = GridData.FILL;
	data.horizontalAlignment = GridData.FILL;
	pageComponent.setLayoutData(data);
	pageComponent.setFont(font);

	//layout the contents

	//layout the top table & its buttons
	Label label = new Label(pageComponent, SWT.LEFT);
	label.setText(WorkbenchMessages.getString("FileEditorPreference.fileTypes")); //$NON-NLS-1$
	data = new GridData();
	data.horizontalAlignment = GridData.FILL;
	data.horizontalSpan = 2;
	label.setLayoutData(data);
	label.setFont(font);

	resourceTypeTable = new Table(pageComponent, SWT.SINGLE \| SWT.BORDER \| SWT.FULL_SELECTION);
	resourceTypeTable.addListener(SWT.Selection, this);
	resourceTypeTable.addListener(SWT.DefaultSelection, this);
	data = new GridData(GridData.FILL_HORIZONTAL);

	int availableRows = DialogUtil.availableRows(pageComponent);

	data.heightHint = resourceTypeTable.getItemHeight()* (availableRows / 8);
	resourceTypeTable.setLayoutData(data);
	resourceTypeTable.setFont(font);

	Composite groupComponent= new Composite(pageComponent, SWT.NULL);
	GridLayout groupLayout = new GridLayout();
	groupLayout.marginWidth = 0;
	groupLayout.marginHeight = 0;
	groupComponent.setLayout(groupLayout);
	data = new GridData();
	data.verticalAlignment = GridData.FILL;
	data.horizontalAlignment = GridData.FILL;
	groupComponent.setLayoutData(data);
	groupComponent.setFont(font);

	addResourceTypeButton = new Button(groupComponent, SWT.PUSH);
	addResourceTypeButton.setText(WorkbenchMessages.getString("FileEditorPreference.add")); //$NON-NLS-1$
	addResourceTypeButton.addListener(SWT.Selection, this);
	addResourceTypeButton.setLayoutData(data);
	addResourceTypeButton.setFont(font);
	setButtonLayoutData(addResourceTypeButton);


	removeResourceTypeButton = new Button(groupComponent, SWT.PUSH);
	removeResourceTypeButton.setText(WorkbenchMessages.getString("FileEditorPreference.remove")); //$NON-NLS-1$
	removeResourceTypeButton.addListener(SWT.Selection, this);
	removeResourceTypeButton.setFont(font);
	setButtonLayoutData(removeResourceTypeButton);

	//Spacer
	label = new Label(pageComponent, SWT.LEFT);
	data = new GridData();
	data.horizontalAlignment = GridData.FILL;
	data.horizontalSpan = 2;
	label.setLayoutData(data);

	// layout the bottom table & its buttons
	editorLabel = new Label(pageComponent, SWT.LEFT);
	editorLabel.setText(WorkbenchMessages.getString("FileEditorPreference.associatedEditors")); //$NON-NLS-1$
	data = new GridData();
	data.horizontalAlignment = GridData.FILL;
	data.horizontalSpan = 2;
	editorLabel.setLayoutData(data);
	editorLabel.setFont(font);

	editorTable = new Table(pageComponent, SWT.SINGLE \| SWT.BORDER);
	editorTable.addListener(SWT.Selection, this);
	editorTable.addListener(SWT.DefaultSelection, this);
	data = new GridData(GridData.FILL_BOTH);
	data.heightHint = editorTable.getItemHeight()*7;
	editorTable.setLayoutData(data);
	editorTable.setFont(font);

	groupComponent = new Composite(pageComponent, SWT.NULL);
	groupLayout = new GridLayout();
	groupLayout.marginWidth = 0;
	groupLayout.marginHeight = 0;
	groupComponent.setLayout(groupLayout);
	data = new GridData();
	data.verticalAlignment = GridData.FILL;
	data.horizontalAlignment = GridData.FILL;
	groupComponent.setLayoutData(data);
	groupComponent.setFont(font);

	addEditorButton = new Button(groupComponent, SWT.PUSH);
	addEditorButton.setText(WorkbenchMessages.getString("FileEditorPreference.addEditor")); //$NON-NLS-1$
	addEditorButton.addListener(SWT.Selection, this);
	addEditorButton.setLayoutData(data);
	addEditorButton.setFont(font);
	setButtonLayoutData(addEditorButton);

	removeEditorButton = new Button(groupComponent, SWT.PUSH);
	removeEditorButton.setText(WorkbenchMessages.getString("FileEditorPreference.removeEditor")); //$NON-NLS-1$
	removeEditorButton.addListener(SWT.Selection, this);
	removeEditorButton.setFont(font);
	setButtonLayoutData(removeEditorButton);

	defaultEditorButton= new Button(groupComponent, SWT.PUSH);
	defaultEditorButton.setText(WorkbenchMessages.getString("FileEditorPreference.default")); //$NON-NLS-1$
	defaultEditorButton.addListener(SWT.Selection, this);
	defaultEditorButton.setFont(font);
	setButtonLayoutData(defaultEditorButton);

	fillResourceTypeTable();
	if (resourceTypeTable.getItemCount() > 0) {
	resourceTypeTable.setSelection(0);
	}
	fillEditorTable();
	updateEnabledState();

	WorkbenchHelp.setHelp(parent, IHelpContextIds.FILE_EDITORS_PREFERENCE_PAGE);

	return pageComponent;
	}
	/**
	* The preference page is going to be disposed. So deallocate all allocated
	* SWT resources that aren't disposed automatically by disposing the page
	* (i.e fonts, cursors, etc). Subclasses should reimplement this method to
	* release their own allocated SWT resources.
	*/
	public void dispose() {
	super.dispose();
	if(imagesToDispose != null) {
	for (Iterator e = imagesToDispose.iterator(); e.hasNext();) {
	((Image)e.next()).dispose();
	}
	imagesToDispose = null;
	}
	if (editorsToImages != null) {
	for (Iterator e = editorsToImages.values().iterator(); e.hasNext();) {
	((Image)e.next()).dispose();
	}
	editorsToImages = null;
	}
	}

	/**
	* Hook method to get a page specific preference store. Reimplement this
	* method if a page don't want to use its parent's preference store.
	*/
	protected IPreferenceStore doGetPreferenceStore() {
	return WorkbenchPlugin.getDefault().getPreferenceStore();
	}
	protected void fillEditorTable() {
	editorTable.removeAll();
	FileEditorMapping resourceType = getSelectedResourceType();
	if (resourceType != null) {
	IEditorDescriptor[] array = resourceType.getEditors();
	for (int i=0;i < array.length; i++) {
	IEditorDescriptor editor = array[i];
	TableItem item = new TableItem(editorTable, SWT.NULL);
	item.setData(editor);
	// Check if it is the default editor
	String defaultString = null;
	FileEditorMapping ext = getSelectedResourceType();
	if (ext != null){
	IEditorDescriptor preferredEditor = ext.getDefaultEditor();
	if (preferredEditor == editor)
	defaultString = WorkbenchMessages.getString("FileEditorPreference.defaultLabel"); //$NON-NLS-1$
	}

	if (defaultString != null) {
	item.setText(editor.getLabel() + " " + defaultString); //$NON-NLS-1$
	}
	else {
	item.setText(editor.getLabel());
	}
	item.setImage(getImage(editor));
	}
	}
	}
	/**
	* Place the existing resource types in the table
	*/
	protected void fillResourceTypeTable() {
	// Populate the table with the items
	IFileEditorMapping[] array = WorkbenchPlugin.getDefault().getEditorRegistry().getFileEditorMappings();
	for (int i = 0; i < array.length; i++) {
	FileEditorMapping mapping = (FileEditorMapping) array[i];
	mapping = (FileEditorMapping) mapping.clone(); // want a copy
	newResourceTableItem(mapping, i, false);
	}
	}
	/**
	* Returns the image associated with the given editor.
	*/
	protected Image getImage(IEditorDescriptor editor) {
	Image image = (Image)editorsToImages.get(editor);
	if (image == null) {
	image = editor.getImageDescriptor().createImage();
	editorsToImages.put(editor, image);
	}
	return image;
	}
	protected FileEditorMapping getSelectedResourceType() {
	TableItem[] items = resourceTypeTable.getSelection();
	if (items.length > 0) {
	return (FileEditorMapping)items[0].getData(); //Table is single select
	} else {
	return null;
	}
	}
	protected IEditorDescriptor[] getAssociatedEditors(){
	if (getSelectedResourceType() == null)
	return null;
	if (editorTable.getItemCount() > 0) {
	ArrayList editorList = new ArrayList();
	for (int i = 0; i < editorTable.getItemCount(); i++)
	editorList.add(editorTable.getItem(i).getData());

	return (IEditorDescriptor[])editorList.toArray(new IEditorDescriptor[editorList.size()]);
	}
	else
	return null;
	}
	public void handleEvent(Event event) {
	if (event.widget == addResourceTypeButton) {
	promptForResourceType();
	} else if (event.widget == removeResourceTypeButton) {
	removeSelectedResourceType();
	} else if (event.widget == addEditorButton) {
	promptForEditor();
	} else if (event.widget == removeEditorButton) {
	removeSelectedEditor();
	} else if (event.widget == defaultEditorButton) {
	setSelectedEditorAsDefault();
	} else if (event.widget == resourceTypeTable) {
	fillEditorTable();
	}

	updateEnabledState();

	}
	/**
	* @see IWorkbenchPreferencePage
	*/
	public void init(IWorkbench aWorkbench){
	this.workbench = aWorkbench;
	noDefaultAndApplyButton();
	}
	/*
	* Create a new <code>TableItem</code> to represent the resource
	* type editor description supplied.
	*/
	protected TableItem newResourceTableItem(IFileEditorMapping mapping, int index, boolean selected) {
	Image image = mapping.getImageDescriptor().createImage(false);
	if (image != null)
	imagesToDispose.add(image);

	TableItem item = new TableItem(resourceTypeTable, SWT.NULL, index);
	if (image != null) {
	item.setImage(image);
	}
	item.setText(mapping.getLabel());
	item.setData(mapping);
	if (selected) {
	resourceTypeTable.setSelection(index);
	}

	return item;
	}
	/**
	* This is a hook for sublcasses to do special things when the ok
	* button is pressed.
	* For example reimplement this method if you want to save the
	* page's data into the preference bundle.
	*/
	public boolean performOk() {
	TableItem[] items = resourceTypeTable.getItems();
	FileEditorMapping[] resourceTypes = new FileEditorMapping[items.length];
	for (int i = 0; i < items.length; i++) {
	resourceTypes[i] = (FileEditorMapping)(items[i].getData());
	}
	EditorRegistry registry = (EditorRegistry)WorkbenchPlugin.getDefault().getEditorRegistry(); // cast to allow save to be called
	registry.setFileEditorMappings(resourceTypes);
	registry.saveAssociations();
	return true;
	}
	public void promptForEditor() {
	EditorSelectionDialog dialog = new EditorSelectionDialog(getControl().getShell());
	dialog.setEditorsToFilter(getAssociatedEditors());
	dialog.setMessage(WorkbenchMessages.format("Choose_the_editor_for_file", new Object[] {getSelectedResourceType().getLabel()})); //$NON-NLS-1$
	if (dialog.open() == Dialog.OK) {
	EditorDescriptor editor = (EditorDescriptor)dialog.getSelectedEditor();
	if (editor != null) {
	int i = editorTable.getItemCount();
	boolean isEmpty = i < 1;
	TableItem item = new TableItem(editorTable, SWT.NULL, i);
	item.setData(editor);
	if (isEmpty)
	item.setText(editor.getLabel() + " " + WorkbenchMessages.getString("FileEditorPreference.defaultLabel")); //$NON-NLS-2$ //$NON-NLS-1$
	else
	item.setText(editor.getLabel());
	item.setImage(getImage(editor));
	editorTable.setSelection(i);
	editorTable.setFocus();
	getSelectedResourceType().addEditor(editor);
	updateSelectedResourceType(); //in case of new default
	}
	}
	}
	public void promptForResourceType() {
	FileExtensionDialog dialog = new FileExtensionDialog(getControl().getShell());
	if (dialog.open() == Dialog.OK) {
	String name = dialog.getName();
	String extension = dialog.getExtension();
	addResourceType(name, extension);
	}
	}
	/**
	* Remove the editor from the table
	*/
	public void removeSelectedEditor() {
	TableItem[] items = editorTable.getSelection();
	boolean defaultEditor = editorTable.getSelectionIndex() == 0;
	if (items.length > 0) {
	getSelectedResourceType().removeEditor((EditorDescriptor)items[0].getData());
	items[0].dispose(); //Table is single selection
	}
	if (defaultEditor && editorTable.getItemCount() > 0){
	TableItem item = editorTable.getItem(0);
	if (item != null)
	item.setText(((EditorDescriptor)(item.getData())).getLabel() + " " + WorkbenchMessages.getString("FileEditorPreference.defaultLabel")); //$NON-NLS-2$ //$NON-NLS-1$
	}

	}
	/**
	* Remove the type from the table
	*/
	public void removeSelectedResourceType() {
	TableItem[] items = resourceTypeTable.getSelection();
	if (items.length > 0) {
	items[0].dispose(); //Table is single selection
	}
	//Clear out the editors too
	editorTable.removeAll();
	}
	public void setSelectedEditorAsDefault() {
	TableItem[] items = editorTable.getSelection();
	if (items.length > 0) {
	// First change the label of the old default
	TableItem oldDefaultItem = editorTable.getItem(0);
	oldDefaultItem.setText(((EditorDescriptor)oldDefaultItem.getData()).getLabel());
	// Now set the new default
	EditorDescriptor editor = (EditorDescriptor)items[0].getData();
	getSelectedResourceType().setDefaultEditor(editor);
	items[0].dispose(); //Table is single selection
	TableItem item = new TableItem(editorTable, SWT.NULL, 0);
	item.setData(editor);
	item.setText(editor.getLabel() + " " + WorkbenchMessages.getString("FileEditorPreference.defaultLabel")); //$NON-NLS-2$ //$NON-NLS-1$
	item.setImage(getImage(editor));
	editorTable.setSelection(new TableItem[] {item});
	}
	}
	public void updateEnabledState() {
	//Update enabled state
	boolean resourceTypeSelected = resourceTypeTable.getSelectionIndex() != -1;
	boolean editorSelected = editorTable.getSelectionIndex() != -1;

	removeResourceTypeButton.setEnabled(resourceTypeSelected);
	editorLabel.setEnabled(resourceTypeSelected);
	addEditorButton.setEnabled(resourceTypeSelected);
	removeEditorButton.setEnabled(editorSelected);
	defaultEditorButton.setEnabled(editorSelected);
	}
	public void updateSelectedResourceType() {
	// TableItem item = resourceTypeTable.getSelection()[0]; //Single select
	// Image image = ((IFileEditorMapping)item.getData()).getImageDescriptor().getImage();
	// imagesToDispose.addElement(image);
	// item.setImage(image);
	}
	}