Buttons.java example

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perconik-master
package sk.stuba.fiit.perconik.ui;

import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.layout.PixelConverter;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;

import sk.stuba.fiit.perconik.eclipse.swt.widgets.WidgetListener;

import static java.lang.Math.max;

public final class Buttons {
  private Buttons() {}

  public static Button create(final Composite parent, final String text, final WidgetListener listener) {
    GridData data = new GridData(GridData.FILL, GridData.BEGINNING, false, false);

    return create(parent, text, data, listener);
  }

  public static Button create(final Composite parent, final String text, final GridData data, final WidgetListener listener) {
    Button button = new Button(parent, SWT.PUSH);

    button.setText(text);
    button.setLayoutData(data);
    button.addListener(SWT.Selection, listener);

    return button;
  }

  public static Button createCentering(final Composite parent, final String text, final WidgetListener listener) {
    return createCentering(parent, text, GridData.FILL_HORIZONTAL, listener);
  }

  public static Button createCentering(final Composite parent, final String text, final int style, final WidgetListener listener) {
    GridData data = new GridData(style);
    Button button = create(parent, text, data, listener);

    data.widthHint = computeWidthHint(button);

    return button;
  }

  public static int computeWidthHint(final Button button) {
    button.setFont(JFaceResources.getDialogFont());

    int width = new PixelConverter(button).convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH);

    return max(width, button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x);
  }
}