package toolbar;

import java.util.Arrays;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.widgets.ToolBar;
import org.eclipse.swt.widgets.ToolItem;

public class SnippetToolbarResize {

	public static boolean forceLayout = false;
	private static boolean useAsyncRequest = false;

	public static void main(String[] args) {
		Display display = new Display();
		Shell shell = new Shell(display);
		shell.setText("Toolbar with dynamic content");
		ToolBar bar = new ToolBar(shell, SWT.WRAP | SWT.FLAT);
		shell.setLayout(new GridLayout());
		bar.setBackground(display.getSystemColor(SWT.COLOR_RED));
		Text text = new Text(shell, SWT.WRAP);
		text.setLayoutData(new GridData(GridData.FILL_BOTH));
		text.setText("You can type some text here and add it to the combobox");
		ToolItem item = new ToolItem(bar, 0);
		item.setText("Add Text");
		ToolItem sep = new ToolItem(bar, SWT.SEPARATOR);
		Combo combo = new Combo(bar, SWT.READ_ONLY);
		sep.setWidth(100);
		sep.setControl(combo);
		ToolItem otheritem = new ToolItem(bar, 0);
		otheritem.setText("Click here");
		otheritem.addSelectionListener(new SelectionListener() {

			@Override
			public void widgetSelected(SelectionEvent e) {
				item.setText("You should really click here!");
				forceLayout(bar);
			}

			@Override
			public void widgetDefaultSelected(SelectionEvent e) {

			}
		});
		item.addSelectionListener(new SelectionListener() {

			@Override
			public void widgetSelected(SelectionEvent e) {
				combo.add(text.getText());
				int width = Arrays.stream(combo.getItems()).mapToInt(String::length).max().orElse(10) * 10;
				sep.setWidth(width);
				forceLayout(bar);
			}

			@Override
			public void widgetDefaultSelected(SelectionEvent e) {

			}
		});
		shell.setSize(400, 400);
		shell.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}
		display.dispose();
	}

	private static void forceLayout(ToolBar bar) {
		// There are two problems here:
		if (forceLayout) {
			// 1) I don't really want to manually call *any* layout method and would assume
			// this is done automatic by the Toolbar(Item)
			if (useAsyncRequest) {
				// 2) calling bar.requestLayout() works ,
				bar.requestLayout();
			} else {
				// but calling
				// bar.layout(true, true);
				// or
				// bar.layout(true);
				// does not work
				bar.layout();
				bar.layout(true);
				bar.layout(true, true);
			}
		}
	}
}