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    <p>I implementer the Group-FieldEditor which can contain other FieldEditors and layout them as a Group.</p> <pre><code> import java.util.Collection; import org.eclipse.jface.preference.FieldEditor; import org.eclipse.jface.preference.FieldEditorPreferencePage; import org.eclipse.jface.preference.IPreferenceStore; import org.eclipse.swt.SWT; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Group; /** * Class is intended to create a Group Widgets, inside of the {@link FieldEditorPreferencePage} * objects. * This class should be used as following: * <ul> * <li>use the {@link #getFieldEditorParent()} to as a parent, while creating new Field Editors. * <li>use {@link #setFieldEditors(Collection)} to add the collection of FieldEditors to the * {@link GroupFieldEditor}. * </ul> * * @author alf * */ public class GroupFieldEditor extends FieldEditor { private String name; private Collection members; private int numcolumns; private Group group; private Composite parent; /** * The gap outside, between the group-frame and the widgets around the group */ private static final int GROUP_PADDING = 5; // px /** * The gap inside, between the group-frame and the content */ private static final int GROUP_VERTICAL_MARGIN = 5; // px /** * The inside-distance creates a new boolean field editor */ protected GroupFieldEditor() { } /** * Creates a Group of {@link FieldEditor} objects * * @param name * - name * @param fieldEditorParent * - parent */ public GroupFieldEditor(String name, Composite fieldEditorParent) { this.name = name; // the parent is a Composite, which is contained inside of the preference page. Initially it // does not have any layout. this.parent = fieldEditorParent; FillLayout fillLayout = new FillLayout(); fillLayout.marginHeight = GROUP_VERTICAL_MARGIN; this.parent.setLayout(fillLayout); this.group = new Group(parent, SWT.DEFAULT); this.group.setText(this.name); } /** * The parent for all the FieldEditors inside of this Group. * * @return - the parent */ public Composite getFieldEditorParent() { return group; } /** * Sets the FieldeditorChildren for this {@link GroupFieldEditor} * * @param membersParam */ public void setFieldEditors(Collection membersParam) { this.members = membersParam; doFillIntoGrid(getFieldEditorParent(), numcolumns); } /* * (non-Javadoc) Method declared on FieldEditor. */ @Override protected void adjustForNumColumns(int numColumns) { this.numcolumns = numColumns; } /* * (non-Javadoc) Method declared on FieldEditor. */ @Override protected void doFillIntoGrid(Composite parentParam, int numColumns) { GridLayout gridLayout = new GridLayout(); gridLayout.marginLeft = GROUP_PADDING; gridLayout.marginRight = GROUP_PADDING; gridLayout.marginTop = GROUP_PADDING; gridLayout.marginBottom = GROUP_PADDING; this.group.setLayout(gridLayout); this.parent.layout(); this.parent.redraw(); if (members != null) { for (FieldEditor editor : members) { editor.fillIntoGrid(getFieldEditorParent(), 1); } } } /* * (non-Javadoc) Method declared on FieldEditor. Loads the value from the * preference store and sets it to the check box. */ @Override protected void doLoad() { if (members != null) { for (FieldEditor editor : members) { editor.load(); } } } /* * (non-Javadoc) Method declared on FieldEditor. Loads the default value * from the preference store and sets it to the check box. */ @Override protected void doLoadDefault() { if (members != null) { for (FieldEditor editor : members) { editor.loadDefault(); } } } /* * (non-Javadoc) Method declared on FieldEditor. */ @Override protected void doStore() { if (members != null) { for (FieldEditor editor : members) { editor.store(); } } } @Override public void store() { super.store(); doStore(); } /* * (non-Javadoc) Method declared on FieldEditor. */ @Override public int getNumberOfControls() { return 1; } /* * (non-Javadoc) Method declared on FieldEditor. */ @Override public void setFocus() { if (members != null && !members.isEmpty()) { members.iterator().next().setFocus(); } } /* * @see FieldEditor.setEnabled */ @Override public void setEnabled(boolean enabled, Composite parentParam) { if (members != null) { for (FieldEditor editor : members) { editor.setEnabled(enabled, parentParam); } } } @Override public void setPreferenceStore(IPreferenceStore store) { super.setPreferenceStore(store); if (members != null) { for (FieldEditor editor : members) { editor.setPreferenceStore(store); } } } } </code></pre>
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