FillLayoutTab.java

/*******************************************************************************
 * 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 Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.examples.layoutexample;

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CCombo;
import org.eclipse.swt.custom.TableEditor;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.TableItem;

class FillLayoutTab extends Tab {
	CCombo		combo;
	/* TableEditors and related controls */
	TableEditor	comboEditor;
	/* The example layout instance */
	FillLayout	fillLayout;
	/* Controls for setting layout parameters */
	Button		horizontal, vertical;

	/**
	 * Creates the Tab within a given instance of LayoutExample.
	 */
	FillLayoutTab(LayoutExample instance) {
		super(instance);
	}

	/**
	 * Creates the widgets in the "child" group.
	 */
	void createChildWidgets() {
		/* Add common controls */
		super.createChildWidgets();

		/* Add TableEditors */
		comboEditor = new TableEditor(table);
		table.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				resetEditors();
				index = table.getSelectionIndex();
				if (index == -1)
					return;
				TableItem oldItem = comboEditor.getItem();
				newItem = table.getItem(index);
				if (newItem == oldItem || newItem != lastSelected) {
					lastSelected = newItem;
					return;
				}
				table.showSelection();

				combo = new CCombo(table, SWT.READ_ONLY);
				createComboEditor(combo, comboEditor);
			}
		});

		/* Add listener to add an element to the table */
		add.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				TableItem item = new TableItem(table, 0);
				item.setText(0, String.valueOf(table.indexOf(item)));
				item.setText(1, "Button");
				data.addElement("Button");
				resetEditors();
			}
		});
	}

	/**
	 * Creates the control widgets.
	 */
	void createControlWidgets() {
		/* Controls the type of FillLayout */
		Group typeGroup = new Group(controlGroup, SWT.NONE);
		typeGroup.setText(LayoutExample.getResourceString("Type"));
		typeGroup.setLayout(new GridLayout());
		typeGroup.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		horizontal = new Button(typeGroup, SWT.RADIO);
		horizontal.setText("SWT.HORIZONTAL");
		horizontal.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		horizontal.setSelection(true);
		horizontal.addSelectionListener(selectionListener);
		vertical = new Button(typeGroup, SWT.RADIO);
		vertical.setText("SWT.VERTICAL");
		vertical.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		vertical.addSelectionListener(selectionListener);

		/* Add common controls */
		super.createControlWidgets();

		/* Position the sash */
		sash.setWeights(new int[] { 4, 1 });
	}

	/**
	 * Creates the example layout.
	 */
	void createLayout() {
		fillLayout = new FillLayout();
		layoutComposite.setLayout(fillLayout);
	}

	/**
	 * Disposes the editors without placing their contents into the table.
	 */
	void disposeEditors() {
		comboEditor.setEditor(null, null, -1);
		combo.dispose();
	}

	/**
	 * Generates code for the example layout.
	 */
	StringBuffer generateLayoutCode() {
		StringBuffer code = new StringBuffer();
		code.append("\t\tFillLayout fillLayout = new FillLayout ();\n");
		if (fillLayout.type == SWT.VERTICAL)
			code.append("\t\tfillLayout.type = SWT.VERTICAL;\n");
		code.append("\t\tshell.setLayout (fillLayout);\n");
		for (int i = 0; i < children.length; i++) {
			Control control = children[i];
			code.append(getChildCode(control, i));
		}
		return code;
	}

	/**
	 * Returns the layout data field names.
	 */
	String[] getLayoutDataFieldNames() {
		return new String[] { "", "Control" };
	}

	/**
	 * Gets the text for the tab folder item.
	 */
	String getTabText() {
		return "FillLayout";
	}

	/**
	 * Takes information from TableEditors and stores it.
	 */
	void resetEditors() {
		TableItem oldItem = comboEditor.getItem();
		comboEditor.setEditor(null, null, -1);
		if (oldItem != null) {
			int row = table.indexOf(oldItem);
			data.insertElementAt(combo.getText(), row);
			oldItem.setText(1, data.elementAt(row).toString());
			combo.dispose();
		}
		setLayoutState();
		refreshLayoutComposite();
		layoutComposite.layout(true);
		layoutGroup.layout(true);
	}

	/**
	 * Sets the state of the layout.
	 */
	void setLayoutState() {
		if (vertical.getSelection())
			fillLayout.type = SWT.VERTICAL;
		else
			fillLayout.type = SWT.HORIZONTAL;
	}
}