/*******************************************************************************
 * Copyright (c) 2026 Eclipse Foundation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     Eclipse Foundation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.snippets;

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

/**
 * ToolBar computeSize test: verify whether the GTK3 toolbar sizing bug
 * (toolbar reports only the overflow arrow width when show_arrow is enabled)
 * is still present.
 *
 * <p>This snippet creates a ToolBar with several items and compares the
 * computed size with and without the SWT.WRAP style. If the GTK bug is fixed,
 * both sizes should be similar. If the bug is still present, the WRAP toolbar
 * will report a much smaller width (just the arrow).
 *
 * <p>See https://github.com/eclipse-platform/eclipse.platform.swt/issues/3236
 *
 * <p>For a list of all SWT example snippets see
 * https://eclipse.dev/eclipse/swt/snippets/
 */
public class Snippet395 {

public static void main(String[] args) {
	Display display = new Display();
	Shell shell = new Shell(display);
	shell.setText("Snippet 395 - ToolBar computeSize with WRAP");
	shell.setLayout(new GridLayout(1, false));

	// Create a toolbar WITHOUT SWT.WRAP
	ToolBar toolBarNoWrap = new ToolBar(shell, SWT.FLAT | SWT.RIGHT);
	addItems(toolBarNoWrap);

	// Create a toolbar WITH SWT.WRAP
	ToolBar toolBarWrap = new ToolBar(shell, SWT.FLAT | SWT.RIGHT | SWT.WRAP);
	addItems(toolBarWrap);

	// Compute sizes
	Point sizeNoWrap = toolBarNoWrap.computeSize(SWT.DEFAULT, SWT.DEFAULT);
	Point sizeWrap = toolBarWrap.computeSize(SWT.DEFAULT, SWT.DEFAULT);

	// Display results
	Label resultLabel = new Label(shell, SWT.WRAP);
	resultLabel.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
	StringBuilder sb = new StringBuilder();
	sb.append("ToolBar without WRAP: " + sizeNoWrap.x + " x " + sizeNoWrap.y + "\n");
	sb.append("ToolBar with    WRAP: " + sizeWrap.x + " x " + sizeWrap.y + "\n\n");

	int widthDiff = Math.abs(sizeNoWrap.x - sizeWrap.x);
	if (widthDiff > sizeNoWrap.x / 2) {
		sb.append("RESULT: Large width difference (" + widthDiff + "px). "
			+ "The GTK sizing bug may still be present.\n"
			+ "The WRAP toolbar is likely reporting only the arrow width.");
	} else {
		sb.append("RESULT: Widths are similar (diff=" + widthDiff + "px). "
			+ "The GTK sizing bug appears to be fixed.");
	}
	resultLabel.setText(sb.toString());

	// Also print to console
	System.out.println(sb);

	shell.pack();
	shell.open();
	while (!shell.isDisposed()) {
		if (!display.readAndDispatch()) display.sleep();
	}
	display.dispose();
}

private static void addItems(ToolBar toolBar) {
	for (int i = 0; i < 5; i++) {
		ToolItem item = new ToolItem(toolBar, SWT.PUSH);
		item.setText("Action " + (i + 1));
	}
}

}