examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/layoutexample/Tab.java

package org.eclipse.swt.examples.layoutexample;

/*
 * Copyright (c) 2000, 2002 IBM Corp.  All rights reserved.
 * This file is 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
 */
 
import java.util.Vector;

import org.eclipse.swt.*;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

/**
 * <code>Tab</code> is the abstract superclass of every page
 * in the example's tab folder.  Each page in the tab folder
 * displays a layout, and allows the user to manipulate the
 * layout.
 *
 * A typical page in a Tab contains a two column composite.
 * The left column contains the layout group, which contains
 * the "layout composite" (the one that has the example layout).
 * The right column contains the "control" group. The "control"
 * group allows the user to interact with the example. Typical
 * operations are modifying layout parameters, adding children
 * to the "layout composite", and modifying child layout data.
 * The "Code" button in the "control" group opens a new window
 * containing code that will regenerate the layout. This code
 * (or parts of it) can be selected and copied to the clipboard.
 */
abstract class Tab {	
	/* Common groups and composites */
	Composite tabFolderPage;
	SashForm sash;
	Group layoutGroup, controlGroup, childGroup;
	/* The composite that contains the example layout */
	Composite layoutComposite;
	/* Common controls for modifying the example layout */
	String [] names;
	Control [] children;
	Button size, add, delete, clear, code;
	/* Common values for working with TableEditors */
	Table table;
	int index;
	TableItem newItem, lastSelected;
	Vector data = new Vector ();
	/* Controlling instance */
	final LayoutExample instance;

	/* Listeners */
	SelectionListener selectionListener = new SelectionAdapter () {
		public void widgetSelected (SelectionEvent e) {
			resetEditors ();
		};
	};
		
	TraverseListener traverseListener = new TraverseListener () {
		public void keyTraversed (TraverseEvent e) {
			if (e.detail == SWT.TRAVERSE_RETURN) {
				e.doit = false;
				resetEditors ();
			}
		};
	};

	/**
	 * Creates the Tab within a given instance of LayoutExample.
	 */
	Tab(LayoutExample instance) {
		this.instance = instance;
	}
	
	/**
	 * Creates the "child" group. This is the group that allows
	 * you to add children to the layout. It exists within the
	 * controlGroup.
	 */
	void createChildGroup () {
		childGroup = new Group (controlGroup, SWT.NONE);
		childGroup.setText (LayoutExample.getResourceString("Children"));
		GridLayout layout = new GridLayout ();
		layout.numColumns = 3;
		childGroup.setLayout (layout);
		GridData data = new GridData (GridData.FILL_BOTH);
		data.horizontalSpan = 2;
		childGroup.setLayoutData (data); 
		createChildWidgets ();
	}
	
	/**
	 * Creates the controls for modifying the "children" 
	 * table, and the table itself.
	 * Subclasses override this method to augment the
	 * standard table.
	 */
	void createChildWidgets () {
		/* Controls for adding and removing children */
		add = new Button (childGroup, SWT.PUSH);
		add.setText (LayoutExample.getResourceString ("Add"));
		add.setLayoutData(new GridData (GridData.FILL_HORIZONTAL));
		delete = new Button (childGroup, SWT.PUSH);
		delete.setText (LayoutExample.getResourceString ("Delete"));
		delete.setLayoutData(new GridData (GridData.FILL_HORIZONTAL));
		delete.addSelectionListener (new SelectionAdapter () {
			public void widgetSelected (SelectionEvent e) {
				resetEditors ();
				int [] selected = table.getSelectionIndices ();
				table.remove (selected);
				/* Refresh the control indices of the table */
				for (int i = 0; i < table.getItemCount(); i++) {
					table.getItem (i).setText (0, String.valueOf (i));
				}
				refreshLayoutComposite ();
				layoutComposite.layout (true);
				layoutGroup.layout (true);
			}
		});
		clear = new Button (childGroup, SWT.PUSH);
		clear.setText (LayoutExample.getResourceString ("Clear"));
		clear.setLayoutData(new GridData (GridData.FILL_HORIZONTAL));
		clear.addSelectionListener (new SelectionAdapter () {
			public void widgetSelected (SelectionEvent e) {
				resetEditors ();
				children = layoutComposite.getChildren ();
				for (int i = 0; i < children.length; i++) {
					children [i].dispose ();
				}
				table.removeAll ();
				data.clear ();
				children = new Control [0];
				layoutGroup.layout (true);
			}
		});
		/* Create the "children" table */
		table = new Table (childGroup, SWT.MULTI | SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL | SWT.FULL_SELECTION | SWT.HIDE_SELECTION);
		table.setLinesVisible (true);
		table.setHeaderVisible (true);
		GridData gridData = new GridData (GridData.FILL_BOTH);
		gridData.horizontalSpan = 3;
		gridData.heightHint = 150;
		table.setLayoutData (gridData);
		table.addTraverseListener (traverseListener);
		
		/* Add columns to the table */
		String [] columnHeaders = getLayoutDataFieldNames ();
		for (int i = 0; i < columnHeaders.length; i++) {
			TableColumn column = new TableColumn(table, SWT.NONE);
			column.setText (columnHeaders [i]);
			if (i == 0) column.setWidth (20);
			else if (i == 1) column.setWidth (80);
			else column.pack ();
		}
	}

	/**
	 * Creates the TableEditor with a CCombo in the first column
	 * of the table. This CCombo lists all the controls that
	 * the user can select to place on their layout.
	 */
	void createComboEditor (CCombo combo, TableEditor comboEditor) {
		combo.setItems (new String [] {
			"Button", "Canvas", "Combo", "Composite",
			"CoolBar", "Group", "Label", "List",
			"ProgressBar", "Scale", "Slider", "StyledText",
			"Table", "Text", "ToolBar", "Tree"});
		combo.setText (newItem.getText (1));
		
		/* Set up editor */
		comboEditor.horizontalAlignment = SWT.LEFT;
		comboEditor.grabHorizontal = true;
		comboEditor.minimumWidth = 50;
		comboEditor.setEditor (combo, newItem, 1);
		
		/* Add listener */
		combo.addTraverseListener(new TraverseListener() {
        	public void keyTraversed(TraverseEvent e) {
            	if (e.detail == SWT.TRAVERSE_TAB_NEXT || e.detail == SWT.TRAVERSE_RETURN) {
                    resetEditors ();
                }
                if (e.detail == SWT.TRAVERSE_ESCAPE) {
                	disposeEditors ();
                }
            }
        });
	}
	
	/**
	 * Creates the "control" group. This is the group on the
	 * right half of each example tab. It contains controls
	 * for adding new children to the layoutComposite, and
	 * for modifying the children's layout data.
	 */	
	void createControlGroup () {
		controlGroup = new Group (sash, SWT.NONE);
		controlGroup.setText (LayoutExample.getResourceString("Parameters"));
		GridLayout layout = new GridLayout ();
		layout.numColumns = 2;
		controlGroup.setLayout (layout);
		size = new Button (controlGroup, SWT.CHECK);
		size.setText (LayoutExample.getResourceString ("Preferred_Size"));
		size.setSelection (false);
		size.addSelectionListener (new SelectionAdapter () {
			public void widgetSelected (SelectionEvent e) {
				resetEditors ();
				if (size.getSelection ()) {
					layoutComposite.setLayoutData (new GridData ());
					layoutGroup.layout (true);
				} else {
					layoutComposite.setLayoutData (new GridData (GridData.FILL_BOTH));
					layoutGroup.layout (true);
				}
			}
		});
		GridData data = new GridData (GridData.FILL_HORIZONTAL);
		data.horizontalSpan = 2;
		size.setLayoutData (data);
		createControlWidgets ();
	}
		
	/**
	 * Creates the "control" widget children.
	 * Subclasses override this method to augment
	 * the standard controls created.
	 */
	void createControlWidgets () {
		createChildGroup ();
		code = new Button (controlGroup, SWT.PUSH);
		code.setText (LayoutExample.getResourceString ("Code"));
		GridData gridData = new GridData (GridData.HORIZONTAL_ALIGN_CENTER | GridData.GRAB_HORIZONTAL);
		gridData.horizontalSpan = 2;
		code.setLayoutData (gridData);
		code.addSelectionListener (new SelectionAdapter () {
			public void widgetSelected (SelectionEvent e) {
				final Shell shell = new Shell ();	
				shell.setText (LayoutExample.getResourceString ("Generated_Code"));
				shell.setLayout (new FillLayout ());
				final StyledText text = new StyledText (shell, SWT.BORDER | SWT.MULTI | SWT.V_SCROLL | SWT.H_SCROLL);
				String layoutCode = generateCode ().toString ();
				if (layoutCode.length () == 0) return;
				text.setText (layoutCode);
				
				Menu bar = new Menu (shell, SWT.BAR);
				shell.setMenuBar (bar);
				MenuItem editItem = new MenuItem (bar, SWT.CASCADE);
				editItem.setText (LayoutExample.getResourceString ("Edit"));
				Menu menu = new Menu (bar);
				MenuItem select = new MenuItem (menu, SWT.PUSH);
				select.setText (LayoutExample.getResourceString ("Select_All"));
				select.setAccelerator (SWT.MOD1 + 'A');
				select.addSelectionListener (new SelectionAdapter () {
					public void widgetSelected (SelectionEvent e) {
						text.selectAll ();
					}
				});
				MenuItem copy = new MenuItem (menu, SWT.PUSH);
				copy.setText (LayoutExample.getResourceString ("Copy"));
				copy.setAccelerator (SWT.MOD1 + 'C');
				copy.addSelectionListener (new SelectionAdapter () {
					public void widgetSelected (SelectionEvent e) {
						text.copy ();
					}
				});
				MenuItem exit = new MenuItem (menu, SWT.PUSH);
				exit.setText (LayoutExample.getResourceString ("Exit"));
				exit.addSelectionListener (new SelectionAdapter () {
					public void widgetSelected (SelectionEvent e) {
						shell.close ();
					}
				});
				editItem.setMenu (menu);
				
				shell.pack ();
				shell.setSize (400, 500);
				shell.open ();
				Display display = shell.getDisplay ();
				while (!shell.isDisposed ())
					if (!display.readAndDispatch ()) display.sleep ();
			}
		});
	}
	
	/**
	 * Creates the example layout.
	 * Subclasses override this method.
	 */
	void createLayout () {
	}
	
	/**
	 * Creates the composite that contains the example layout.
	 */
	void createLayoutComposite () {
		layoutComposite = new Composite (layoutGroup, SWT.BORDER);
		layoutComposite.setLayoutData (new GridData (GridData.FILL_BOTH));
		createLayout ();
	}
	
	/**
	 * Creates the layout group. This is the group on the
	 * left half of each example tab.
	 */
	void createLayoutGroup () {
		layoutGroup = new Group (sash, SWT.NONE);
		layoutGroup.setText (LayoutExample.getResourceString("Layout"));
		layoutGroup.setLayout (new GridLayout ());
		createLayoutComposite ();
	}
	
	/**
	 * Creates the tab folder page.
	 *
	 * @param tabFolder org.eclipse.swt.widgets.TabFolder
	 * @return the new page for the tab folder
	 */
	Composite createTabFolderPage (TabFolder tabFolder) {
		/* Create a two column page with a SashForm*/
		tabFolderPage = new Composite (tabFolder, SWT.NULL);
		tabFolderPage.setLayout (new FillLayout ());
		sash = new SashForm (tabFolderPage, SWT.HORIZONTAL);
	
		/* Create the "layout" and "control" columns */
		createLayoutGroup ();
		createControlGroup ();
		
		return tabFolderPage;
	}
	
	/**
	 * Creates the TableEditor with a Text in the given column
	 * of the table.
	 */
	void createTextEditor (Text text, TableEditor textEditor, int column) {
		text.setFont (table.getFont ());
		text.selectAll ();
		textEditor.horizontalAlignment = SWT.LEFT;
		textEditor.grabHorizontal = true;
		textEditor.setEditor (text, newItem, column);
		
		text.addTraverseListener(new TraverseListener() {
        	public void keyTraversed(TraverseEvent e) {
            	if (e.detail == SWT.TRAVERSE_TAB_NEXT) {
                    resetEditors (true);
                }
                if (e.detail == SWT.TRAVERSE_ESCAPE) {
                	disposeEditors ();
                }
            }
        });
	}
	
	/** 
	 * Disposes the editors without placing their contents
	 * into the table.
	 * Subclasses override this method.
	 */
	void disposeEditors () {
	}
	
	/**
	 * Generates the code needed to produce the example layout.
	 */	
	StringBuffer generateCode () {
		/* Make sure all information being entered is stored in the table */
		resetEditors ();
		
		/* Get names for controls in the layout */
		names = new String [children.length];
		for (int i = 0; i < children.length; i++) {
			Control control = children [i];
			String controlClass = control.getClass ().toString ();
			String controlType = controlClass.substring (controlClass.lastIndexOf ('.') + 1);
			names [i] = controlType.toLowerCase () + i;
		}
	
		/* Create StringBuffer containing the code */
		StringBuffer code = new StringBuffer ();
		code.append ("import org.eclipse.swt.*;\n");
		code.append ("import org.eclipse.swt.custom.*;\n");
		code.append ("import org.eclipse.swt.graphics.*;\n");
		code.append ("import org.eclipse.swt.layout.*;\n");
		code.append ("import org.eclipse.swt.widgets.*;\n\n");
		code.append ("public class MyLayout {\n");
		code.append ("\tpublic static void main (String [] args) {\n");
		code.append ("\t\tDisplay display = new Display ();\n");
		code.append ("\t\tShell shell = new Shell (display);\n");
		
		/* Get layout specific code */
		code.append (generateLayoutCode ());
		
		code.append ("\n\t\tshell.pack ();\n\t\tshell.open ();\n\n");
		code.append ("\t\twhile (!shell.isDisposed ()) {\n");
		code.append ("\t\t\tif (!display.readAndDispatch ())\n");
		code.append ("\t\t\t\tdisplay.sleep ();\n\t\t}\n\t\tdisplay.dispose ();\n\t}\n}");
		
		return code;
	}
	
	/**
	 * Generates layout specific code for the example layout.
	 * Subclasses override this method.
	 */
	StringBuffer generateLayoutCode () {
		return new StringBuffer ();
	}
	
	/**
	 * Returns the StringBuffer for the code which will 
	 * create a child control.
	 */
	StringBuffer getChildCode (Control control, int i) {
		StringBuffer code = new StringBuffer ();
		/* Find the type of control */
		String controlClass = control.getClass().toString ();
		String controlType = controlClass.substring (controlClass.lastIndexOf ('.') + 1);
		/* Find the style of the control */
		String styleString;
		if (controlType.equals ("Button")) {
			styleString = "SWT.PUSH";
		} else if (controlType.equals ("Text")) {
			styleString = "SWT.BORDER";
		} else if (controlType.equals ("StyledText")) {
			styleString = "SWT.MULTI | SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL";
		} else if (controlType.equals ("Canvas") || controlType.equals ("Composite") || 
					controlType.equals ("Table") || controlType.equals ("StyledText") ||
					controlType.equals ("ToolBar") || controlType.equals ("Tree") ||
					controlType.equals ("List")) {
			styleString = "SWT.BORDER";
		} else styleString = "SWT.NONE";
		/* Write out the control being declared */
		code.append ("\n\t\t" + controlType + " " + names [i] + 
					 " = new " + controlType + " (shell, " + styleString + ");\n");
		/* Add items to those controls that need items */
		if (controlType.equals ("Combo") || controlType.equals ("List")) {
			code.append ("\t\t" + names [i] + ".setItems (new String [] {\"Item 1\", \"Item 2\", \"Item 2\"});\n");
		} else if (controlType.equals ("Table")) {
			code.append ("\t\t" + names [i] + ".setLinesVisible (true);\n");
			for (int j = 1; j < 3; j++) {
				code.append ("\t\tTableItem tableItem" + j + " = new TableItem (" + names [i] + ", SWT.NONE);\n");
				code.append ("\t\ttableItem" + j + ".setText (\"Item" + j + "\");\n");
			}
		} else if (controlType.equals ("Tree")) {
			for (int j = 1; j < 3; j++) {
				code.append ("\t\tTreeItem treeItem" + j + " = new TreeItem (" + names [i] + ", SWT.NONE);\n");
				code.append ("\t\ttreeItem" + j + ".setText (\"Item" + j + "\");\n");
			}
		} else if (controlType.equals ("ToolBar")) {
			for (int j = 1; j < 3; j++) {
				code.append ("\t\tToolItem toolItem" + j + " = new ToolItem (" + names [i] + ", SWT.NONE);\n");
				code.append ("\t\ttoolItem" + j + ".setText (\"Item" + j + "\");\n");
			}
		} else if (controlType.equals ("CoolBar")) {
			code.append ("\t\tToolBar coolToolBar = new ToolBar (" + names [i] + ", SWT.BORDER);\n");
			code.append ("\t\tToolItem coolToolItem = new ToolItem (coolToolBar, SWT.NONE);\n");
			code.append ("\t\tcoolToolItem.setText (\"Item 1\");\n");
			code.append ("\t\tcoolToolItem = new ToolItem (coolToolBar, SWT.NONE);\n");
			code.append ("\t\tcoolToolItem.setText (\"Item 2\");\n");
			code.append ("\t\tCoolItem coolItem1 = new CoolItem (" + names [i] + ", SWT.NONE);\n");
			code.append ("\t\tcoolItem1.setControl (coolToolBar);\n");
			code.append ("\t\tcoolToolBar = new ToolBar (" + names [i] + ", SWT.BORDER);\n");
			code.append ("\t\tcoolToolItem = new ToolItem (coolToolBar, SWT.NONE);\n");
			code.append ("\t\tcoolToolItem.setText (\"Item 3\");\n");
			code.append ("\t\tcoolToolItem = new ToolItem (coolToolBar, SWT.NONE);\n");
			code.append ("\t\tcoolToolItem.setText (\"Item 4\");\n");
			code.append ("\t\tCoolItem coolItem2 = new CoolItem (" + names [i] + ", SWT.NONE);\n");
			code.append ("\t\tcoolItem2.setControl (coolToolBar);\n");
			code.append ("\t\tPoint size = coolToolBar.computeSize (SWT.DEFAULT, SWT.DEFAULT);\n");
			code.append ("\t\tcoolItem1.setSize (coolItem1.computeSize (size.x, size.y));\n");
			code.append ("\t\tcoolItem2.setSize (coolItem2.computeSize (size.x, size.y));\n");
			code.append ("\t\t" + names [i] + ".setSize (" + names [i] + ".computeSize (SWT.DEFAULT, SWT.DEFAULT));\n");
		} else if (controlType.equals ("ProgressBar")) {
			code.append ("\t\t" + names [i] + ".setSelection (50);\n");
		} 
		/* Set text for those controls that support it */			 
		if (controlType.equals ("Button") ||
			controlType.equals ("Combo") ||
			controlType.equals ("Group") ||
			controlType.equals ("Label") ||
			controlType.equals ("StyledText") ||
			controlType.equals ("Text")) {
			code.append ("\t\t" + names [i] + ".setText (\"" + names [i] + "\");\n");
		}
		return code;
	}
		
	/**
	 * Returns the layout data field names.
	 * Subclasses override this method.
	 */
	String [] getLayoutDataFieldNames () {
		return new String [] {};
	}
	
	/**
	 * Gets the text for the tab folder item.
	 * Subclasses override this method.
	 */
	String getTabText () {
		return "";
	}
	
	/**
	 * Refreshes the composite and draws all controls
	 * in the layout example.
	 */
	void refreshLayoutComposite () {
		/* Remove children that are already layed out */
		children = layoutComposite.getChildren ();
		for (int i = 0; i < children.length; i++) {
			children [i].dispose ();
		}
		/* Add all children listed in the table */
		TableItem [] items = table.getItems ();
		children = new Control [items.length];
		String [] itemValues = new String [] {
			LayoutExample.getResourceString ("Item",new String [] {"1"}),
			LayoutExample.getResourceString ("Item",new String [] {"2"}),
			LayoutExample.getResourceString ("Item",new String [] {"3"})};
		for (int i = 0; i < items.length; i++) {
			String control = items [i].getText (1);
			if (control.equals ("Button")) {
				Button button = new Button (layoutComposite, SWT.PUSH);
				button.setText (LayoutExample.getResourceString ("Button_Index", new String [] {new Integer (i).toString ()}));
				children [i] = button;
			} else if (control.equals ("Canvas")) {
				Canvas canvas = new Canvas (layoutComposite, SWT.BORDER);
				children [i] = canvas;
			} else if (control.equals ("Combo")) {
				Combo combo = new Combo (layoutComposite, SWT.NONE);
				combo.setItems (itemValues);
				combo.setText (LayoutExample.getResourceString ("Combo_Index", new String [] {new Integer (i).toString ()}));
				children [i] = combo;
			} else if (control.equals ("Composite")) { 
				Composite composite = new Composite (layoutComposite, SWT.BORDER);
				children [i] = composite;
		    } else if (control.equals ("CoolBar")) { 
		    	CoolBar coolBar = new CoolBar (layoutComposite, SWT.NONE);
		    	ToolBar toolBar = new ToolBar (coolBar, SWT.BORDER);
				ToolItem item = new ToolItem (toolBar, 0);
				item.setText (LayoutExample.getResourceString ("Item",new String [] {"1"}));
				item = new ToolItem (toolBar, 0);
				item.setText (LayoutExample.getResourceString ("Item",new String [] {"2"}));
		    	CoolItem coolItem1 = new CoolItem (coolBar, 0);
		    	coolItem1.setControl (toolBar);
				toolBar = new ToolBar (coolBar, SWT.BORDER);
				item = new ToolItem (toolBar, 0);
				item.setText (LayoutExample.getResourceString ("Item",new String [] {"3"}));
				item = new ToolItem (toolBar, 0);
				item.setText (LayoutExample.getResourceString ("Item",new String [] {"4"}));
		    	CoolItem coolItem2 = new CoolItem (coolBar, 0);
		    	coolItem2.setControl (toolBar);
		    	Point size = toolBar.computeSize(SWT.DEFAULT, SWT.DEFAULT);
        		coolItem1.setSize(coolItem1.computeSize (size.x, size.y));
        		coolItem2.setSize(coolItem2.computeSize (size.x, size.y));
       			coolBar.setSize(coolBar.computeSize(SWT.DEFAULT, SWT.DEFAULT));
				children [i] = coolBar;
		    } else if (control.equals ("Group")) {
				Group group = new Group (layoutComposite, SWT.NONE);
				group.setText (LayoutExample.getResourceString ("Group_Index", new String [] {new Integer (i).toString ()}));
				children [i] = group;
			} else if (control.equals ("Label")) {
				Label label = new Label (layoutComposite, SWT.NONE);
				label.setText (LayoutExample.getResourceString ("Label_Index", new String [] {new Integer (i).toString ()}));
				children [i] = label;
			} else if (control.equals ("List")) {
				List list = new List (layoutComposite, SWT.BORDER);
				list.setItems (itemValues);
				children [i] = list;
			} else if (control.equals ("ProgressBar")) {
				ProgressBar progress = new ProgressBar (layoutComposite, SWT.NONE);
				progress.setSelection (50);
				children [i] = progress;
			} else if (control.equals ("Scale")) {
				Scale scale = new Scale (layoutComposite, SWT.NONE);
				children [i] = scale;
			} else if (control.equals ("Slider")) {
				Slider slider = new Slider (layoutComposite, SWT.NONE);
				children [i] = slider;
			} else if (control.equals ("StyledText")) {
				StyledText styledText = new StyledText (layoutComposite, SWT.MULTI | SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
				styledText.setText (LayoutExample.getResourceString ("StyledText_Index", new String [] {new Integer (i).toString ()}));
				children [i] = styledText;			
			} else if (control.equals ("Table")) {
				Table table = new Table (layoutComposite, SWT.BORDER);
				table.setLinesVisible (true);
				TableItem item1 = new TableItem (table, 0);
				item1.setText (LayoutExample.getResourceString ("Item",new String [] {"1"}));
				TableItem item2 = new TableItem (table, 0);
				item2.setText (LayoutExample.getResourceString ("Item",new String [] {"2"}));
				children [i] = table;
			} else if (control.equals ("Text")) {
				Text text = new Text (layoutComposite, SWT.BORDER);
				text.setText (LayoutExample.getResourceString ("Text_Index", new String [] {new Integer (i).toString ()}));
				children [i] = text;
			} else if (control.equals ("ToolBar")) {
				ToolBar toolBar = new ToolBar (layoutComposite, SWT.BORDER);
				ToolItem item1 = new ToolItem (toolBar, 0);
				item1.setText (LayoutExample.getResourceString ("Item",new String [] {"1"}));
				ToolItem item2 = new ToolItem (toolBar, 0);
				item2.setText (LayoutExample.getResourceString ("Item",new String [] {"2"}));
				children [i] = toolBar;
			} else {
				Tree tree = new Tree (layoutComposite, SWT.BORDER);
				TreeItem item1 = new TreeItem (tree, 0);
				item1.setText (LayoutExample.getResourceString ("Item",new String [] {"1"}));
				TreeItem item2 = new TreeItem (tree, 0);
				item2.setText (LayoutExample.getResourceString ("Item",new String [] {"2"}));
				children [i] = tree;
			} 
		}
	}	
	
	/**
	 * Takes information from TableEditors and stores it.
	 * Subclasses override this method.
	 */
	void resetEditors () {
		resetEditors (false);
	}
	
	void resetEditors (boolean tab) {
	}
	
	/**
	 * Sets the layout data for the children of the layout. 
	 * Subclasses override this method.
	 */
	void setLayoutData () {
	}
	
	/**
	 * Sets the state of the layout.
	 * Subclasses override this method.
	 */
	void setLayoutState () {
	}
}