An efficient way to deal with SWT GridLayout and GridData configurations. Allows you to apply SWT GridLayout and GridData to Composites and Controls in a very compact form, while being more powerful at the same time. To apply a GridLayout and configure it to your use case the following expression can be used: GridLayoutUtil.applyGridLayout( comp…

GridDataUtil.java

package com.eclipsesource.swt.util;

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Control;

public class GridDataUtil {

  private final GridData gridData;

  private GridDataUtil( GridData gridData ) {
    this.gridData = gridData;
  }

  public static GridDataUtil applyGridData( Control control ) {
    GridData gridData = new GridData();
    control.setLayoutData( gridData );
    return new GridDataUtil( gridData );
  }

  public static GridDataUtil onGridData( Control control ) {
    Object layoutData = control.getLayoutData();
    if( layoutData instanceof GridData ) {
      return new GridDataUtil( ( GridData )layoutData );
    }
    throw new IllegalStateException( "Control must have GridData layout data. Has " + layoutData );
  }

  public GridDataUtil withHorizontalFill() {
    gridData.horizontalAlignment = SWT.FILL;
    gridData.verticalAlignment = SWT.CENTER;
    gridData.grabExcessHorizontalSpace = true;
    gridData.grabExcessVerticalSpace = false;
    return this;
  }

  public GridDataUtil withVerticalFill() {
    gridData.horizontalAlignment = SWT.TOP;
    gridData.verticalAlignment = SWT.FILL;
    gridData.grabExcessHorizontalSpace = false;
    gridData.grabExcessVerticalSpace = true;
    return this;
  }

  public GridDataUtil withFill() {
    gridData.horizontalAlignment = SWT.FILL;
    gridData.verticalAlignment = SWT.FILL;
    gridData.grabExcessHorizontalSpace = true;
    gridData.grabExcessVerticalSpace = true;
    return this;
  }

  public GridDataUtil withCenterCollapse() {
    gridData.horizontalAlignment = SWT.CENTER;
    gridData.verticalAlignment = SWT.CENTER;
    gridData.grabExcessHorizontalSpace = false;
    gridData.grabExcessVerticalSpace = false;
    return this;
  }

  public GridDataUtil grabExcessHorizontalSpace( boolean grabExcessHorizontalSpace ) {
    gridData.grabExcessHorizontalSpace = grabExcessHorizontalSpace;
    return this;
  }

  public GridDataUtil grabExcessVerticalSpace( boolean grabExcessVerticalSpace ) {
    gridData.grabExcessVerticalSpace = grabExcessVerticalSpace;
    return this;
  }

  public GridDataUtil horizontalSpan( int horizontalSpan ) {
    gridData.horizontalSpan = horizontalSpan;
    return this;
  }

  public GridDataUtil verticalSpan( int verticalSpan ) {
    gridData.verticalSpan = verticalSpan;
    return this;
  }

  public GridDataUtil minimumHeight( int minimumHeight ) {
    gridData.minimumHeight = minimumHeight;
    return this;
  }

  public GridDataUtil minimumWidth( int minimumWidth ) {
    gridData.minimumWidth = minimumWidth;
    return this;
  }

  public GridDataUtil verticalIndent( int verticalIndent ) {
    gridData.verticalIndent = verticalIndent;
    return this;
  }

  public GridDataUtil horizontalIndent( int horizontalIndent ) {
    gridData.horizontalIndent = horizontalIndent;
    return this;
  }

  public GridDataUtil heightHint( int heightHint ) {
    gridData.heightHint = heightHint;
    return this;
  }

  public GridDataUtil widthHint( int widthHint ) {
    gridData.widthHint = widthHint;
    return this;
  }

  public GridDataUtil verticalAlignment( int verticalAlignment ) {
    gridData.verticalAlignment = verticalAlignment;
    return this;
  }

  public GridDataUtil horizontalAlignment( int horizontalAlignment ) {
    gridData.horizontalAlignment = horizontalAlignment;
    return this;
  }

  public GridDataUtil exclude( boolean exclude ) {
    gridData.exclude = exclude;
    return this;
  }

}

GridLayoutUtil.java

package com.eclipsesource.swt.util;

import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Layout;

public class GridLayoutUtil {

  private final GridLayout gridLayout;

  private GridLayoutUtil( GridLayout gridLayout ) {
    this.gridLayout = gridLayout;
  }

  public static GridLayoutUtil applyGridLayout( Composite composite ) {
    GridLayout gridLayout = new GridLayout();
    gridLayout.marginHeight = 0;
    gridLayout.marginWidth = 0;
    gridLayout.verticalSpacing = 0;
    gridLayout.horizontalSpacing = 0;
    composite.setLayout( gridLayout );
    return new GridLayoutUtil( gridLayout );
  }

  public static GridLayoutUtil onGridLayout( Composite composite ) {
    Layout layout = composite.getLayout();
    if( layout instanceof GridLayout ) {
      return new GridLayoutUtil( ( GridLayout )layout );
    }
    throw new IllegalStateException( "Composite has to have a GridLayout. Has " + layout );
  }

  public GridLayoutUtil numColumns( int numColumns ) {
    gridLayout.numColumns = numColumns;
    return this;
  }

  public GridLayoutUtil columnsEqualWidth( boolean columnsEqualWidth ) {
    gridLayout.makeColumnsEqualWidth = columnsEqualWidth;
    return this;
  }

  public GridLayoutUtil horizontalSpacing( int horizontalSpacing ) {
    gridLayout.horizontalSpacing = horizontalSpacing;
    return this;
  }

  public GridLayoutUtil verticalSpacing( int verticalSpacing ) {
    gridLayout.verticalSpacing = verticalSpacing;
    return this;
  }

  public GridLayoutUtil marginWidth( int marginWidth ) {
    gridLayout.marginWidth = marginWidth;
    return this;
  }

  public GridLayoutUtil marginHeight( int marginHeight ) {
    gridLayout.marginHeight = marginHeight;
    return this;
  }

  public GridLayoutUtil marginTop( int marginTop ) {
    gridLayout.marginTop = marginTop;
    return this;
  }

  public GridLayoutUtil marginBottom( int marginBottom ) {
    gridLayout.marginBottom = marginBottom;
    return this;
  }

  public GridLayoutUtil marginLeft( int marginLeft ) {
    gridLayout.marginLeft = marginLeft;
    return this;
  }

  public GridLayoutUtil marginRight( int marginRight ) {
    gridLayout.marginRight = marginRight;
    return this;
  }

}