Java tutorial
/******************************************************************************* * Copyright (c) 2013 Google, Inc and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * Sergey Prigogin (Google) - initial API and implementation *******************************************************************************/ package org.eclipse.cdt.internal.ui.preferences; import java.util.ArrayList; import org.eclipse.core.resources.IProject; 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.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Group; import org.eclipse.swt.widgets.Text; import org.eclipse.swt.widgets.Widget; import org.eclipse.ui.preferences.IWorkbenchPreferenceContainer; import org.eclipse.cdt.utils.ui.controls.ControlFactory; import org.eclipse.cdt.internal.ui.dialogs.IStatusChangeListener; import org.eclipse.cdt.internal.ui.dialogs.StatusInfo; import org.eclipse.cdt.internal.ui.refactoring.includes.IncludeGroupStyle; /** * The preference block for configuring styles of different categories of include statements. */ public class IncludeGroupStyleBlock extends OptionsConfigurationBlock { private final String description; private IncludeGroupStyle style; private final ArrayList<Button> checkBoxes = new ArrayList<Button>(); private final ArrayList<Text> textBoxes = new ArrayList<Text>(); private PixelConverter pixelConverter; private Button checkBoxBlankLine; private static final Key[] EMPTY_KEY_ARRAY = {}; public IncludeGroupStyleBlock(IStatusChangeListener context, IProject project, IWorkbenchPreferenceContainer container, String description) { super(context, project, EMPTY_KEY_ARRAY, container); this.description = description; } public IncludeGroupStyle getStyle() { return style; } public void setStyle(IncludeGroupStyle style) { this.style = style; } @Override protected Control createContents(Composite parent) { pixelConverter = new PixelConverter(parent); setShell(parent.getShell()); Composite composite = new Composite(parent, SWT.NONE); composite.setFont(parent.getFont()); GridLayout layout = new GridLayout(); layout.marginHeight = pixelConverter.convertHeightInCharsToPixels(1); layout.marginWidth = 0; composite.setLayout(layout); composite.setFont(parent.getFont()); Group group = ControlFactory.createGroup(composite, description, 1); group.setLayoutData(new GridData(GridData.FILL_BOTH)); Composite envelope = new Composite(group, SWT.NONE); layout = new GridLayout(4, false); layout.marginHeight = 0; layout.marginWidth = 0; envelope.setLayout(layout); addCheckBox(envelope, PreferencesMessages.IncludeGroupStyleBlock_keep_includes_together, 0, new BooleanDataSource() { @Override public boolean get() { return style.isKeepTogether(); } @Override public void set(boolean value) { style.setKeepTogether(value); } }); checkBoxBlankLine = addCheckBox(envelope, PreferencesMessages.IncludeGroupStyleBlock_blank_line_before, pixelConverter.convertHorizontalDLUsToPixels(10), new BooleanDataSource() { @Override public boolean get() { return style.isBlankLineBefore(); } @Override public void set(boolean value) { style.setBlankLineBefore(value); } }); if (!style.getIncludeKind().hasChildren()) { addCheckBox(envelope, PreferencesMessages.IncludeGroupStyleBlock_use_relative_path, 0, new BooleanDataSource() { @Override public boolean get() { return style.isRelativePath(); } @Override public void set(boolean value) { style.setRelativePath(value); } }); addCheckBox(envelope, PreferencesMessages.IncludeGroupStyleBlock_use_angle_brackets, 0, new BooleanDataSource() { @Override public boolean get() { return style.isAngleBrackets(); } @Override public void set(boolean value) { style.setAngleBrackets(value); } }); } updateControls(); updateDependent(); return composite; } private Button addCheckBox(Composite parent, String label, int indent, BooleanDataSource dataSource) { GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_FILL); gd.horizontalSpan = 3; gd.horizontalIndent = indent; Button checkBox = new Button(parent, SWT.CHECK); checkBox.setFont(JFaceResources.getDialogFont()); checkBox.setText(label); checkBox.setData(dataSource); checkBox.setLayoutData(gd); checkBox.addSelectionListener(getSelectionListener()); makeScrollableCompositeAware(checkBox); checkBox.setSelection(dataSource.get()); checkBoxes.add(checkBox); return checkBox; } @Override protected void updateControls() { super.updateControls(); for (int i = checkBoxes.size() - 1; i >= 0; i--) { updateCheckBox(checkBoxes.get(i)); } } @Override protected void updateCheckBox(Button checkBox) { BooleanDataSource dataSource = (BooleanDataSource) checkBox.getData(); checkBox.setSelection(dataSource.get()); } @Override protected void controlChanged(Widget widget) { if (widget instanceof Button) { BooleanDataSource dataSource = (BooleanDataSource) widget.getData(); dataSource.set(((Button) widget).getSelection()); } updateDependent(); } private void updateDependent() { checkBoxBlankLine.setEnabled(style.isKeepTogether()); } @Override protected void validateSettings(Key changedKey, String oldValue, String newValue) { StatusInfo status = new StatusInfo(); fContext.statusChanged(status); } private interface BooleanDataSource { boolean get(); void set(boolean value); } private interface StringDataSource { String get(); void set(String value); } }