Java tutorial
/******************************************************************************* * Copyright (c) 2014, 2015 IBM Corporation 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: * IBM Corporation - initial API and implementation * Moshe Wajnberg - <wajnberg@il.ibm.com> - ******************************************************************************/ package org.eclipse.ui.internal.dialogs; import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.layout.GridDataFactory; import org.eclipse.jface.layout.LayoutConstants; import org.eclipse.jface.preference.IPreferenceStore; import org.eclipse.jface.preference.PreferencePage; import org.eclipse.jface.preference.StringFieldEditor; import org.eclipse.jface.util.BidiUtils; import org.eclipse.jface.window.Window; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Combo; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.ui.IWorkbench; import org.eclipse.ui.IWorkbenchPreferencePage; import org.eclipse.ui.PlatformUI; import org.eclipse.ui.internal.IPreferenceConstants; import org.eclipse.ui.internal.IWorkbenchHelpContextIds; import org.eclipse.ui.internal.WorkbenchMessages; import org.eclipse.ui.internal.WorkbenchPlugin; import org.eclipse.ui.internal.util.PrefUtil; /** * Globalization preference page. */ public class GlobalizationPreferencePage extends PreferencePage implements IWorkbenchPreferencePage { private Combo layoutDirectionCombo; private Button bidiSupportClickButton; private Combo textDirectionCombo; private StringFieldEditor nlExtensionsField; private int layoutDirection; private boolean bidiSupport; private String textDirection; private static final String DEFAULT_DIR = WorkbenchMessages.GlobalizationPreference_defaultDirection; private static final String LTR_DIR = WorkbenchMessages.GlobalizationPreference_ltrDirection; private static final String AUTO_DIR = WorkbenchMessages.GlobalizationPreference_autoDirection; private static final String RTL_DIR = WorkbenchMessages.GlobalizationPreference_rtlDirection; @Override protected Control createContents(Composite parent) { PlatformUI.getWorkbench().getHelpSystem().setHelp(parent, IWorkbenchHelpContextIds.GLOBALIZATION_PREFERENCE_PAGE); Composite composite = createComposite(parent); createNlsExtensionsGroup(composite); createSpace(composite); createBidiPreferencesGroup(composite); applyDialogFont(composite); return composite; } /** * Creates the composite which will contain all the preference controls for * this page. * * @param parent * the parent composite * @return the composite for this page */ private static Composite createComposite(Composite parent) { Composite composite = new Composite(parent, SWT.NONE); GridLayout layout = new GridLayout(2, false); layout.marginWidth = 0; layout.marginHeight = 0; composite.setLayout(layout); composite.setLayoutData(new GridData(GridData.VERTICAL_ALIGN_FILL | GridData.HORIZONTAL_ALIGN_FILL)); return composite; } private void createNlsExtensionsGroup(Composite parent) { nlExtensionsField = new StringFieldEditor(IPreferenceConstants.NL_EXTENSIONS, WorkbenchMessages.GlobalizationPreference_nlExtensions, parent); nlExtensionsField.setPreferenceStore(getPreferenceStore()); nlExtensionsField.setPage(this); nlExtensionsField.load(); } private void createBidiPreferencesGroup(Composite composite) { layoutDirectionCombo = addComboBox(composite, WorkbenchMessages.GlobalizationPreference_layoutDirection, 0); layoutDirectionCombo.setItems(new String[] { DEFAULT_DIR, LTR_DIR, RTL_DIR }); layoutDirectionCombo.select(getLayoutDirectionIndex(layoutDirection)); layoutDirectionCombo.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { layoutDirection = getLayoutDirectionInteger(layoutDirectionCombo.getSelectionIndex()); } }); createSpace(composite); bidiSupportClickButton = new Button(composite, SWT.CHECK | SWT.LEFT); bidiSupportClickButton.setLayoutData(GridDataFactory.swtDefaults().span(2, 1).create()); bidiSupportClickButton.setText(WorkbenchMessages.GlobalizationPreference_bidiSupport); bidiSupportClickButton.setSelection(bidiSupport); bidiSupportClickButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { selectClickMode(bidiSupportClickButton.getSelection()); } }); textDirectionCombo = addComboBox(composite, WorkbenchMessages.GlobalizationPreference_textDirection, LayoutConstants.getIndent()); textDirectionCombo.setItems(new String[] { DEFAULT_DIR, LTR_DIR, AUTO_DIR, RTL_DIR }); textDirectionCombo.setEnabled(bidiSupport); textDirectionCombo.select(getTextDirectionIndex(textDirection)); textDirectionCombo.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { textDirection = getTextDirectionString(textDirectionCombo.getSelectionIndex()); } }); createSpace(composite); Font font = composite.getFont(); Composite note = createNoteComposite(font, composite, WorkbenchMessages.Preference_note, WorkbenchMessages.GlobalizationPreference_restartWidget); note.setLayoutData(GridDataFactory.swtDefaults().span(2, 1).create()); } private void selectClickMode(boolean singleClick) { bidiSupport = singleClick; textDirectionCombo.setEnabled(bidiSupport); } private int getTextDirectionIndex(String textDirection) { int index; if (textDirection.equals(BidiUtils.LEFT_TO_RIGHT)) { index = textDirectionCombo.indexOf(LTR_DIR); } else if (textDirection.equals(BidiUtils.RIGHT_TO_LEFT)) { index = textDirectionCombo.indexOf(RTL_DIR); } else if (textDirection.equals(BidiUtils.AUTO)) { index = textDirectionCombo.indexOf(AUTO_DIR); } else { index = textDirectionCombo.indexOf(DEFAULT_DIR); } return index; } private String getTextDirectionString(int index) { String textDir; if (index == textDirectionCombo.indexOf(LTR_DIR)) { textDir = BidiUtils.LEFT_TO_RIGHT; } else if (index == textDirectionCombo.indexOf(AUTO_DIR)) { textDir = BidiUtils.AUTO; } else if (index == textDirectionCombo.indexOf(RTL_DIR)) { textDir = BidiUtils.RIGHT_TO_LEFT; } else { textDir = ""; //$NON-NLS-1$ } return textDir; } private int getLayoutDirectionIndex(int layoutDirection) { int index; if (layoutDirection == SWT.LEFT_TO_RIGHT) { index = layoutDirectionCombo.indexOf(LTR_DIR); } else if (layoutDirection == SWT.RIGHT_TO_LEFT) { index = layoutDirectionCombo.indexOf(RTL_DIR); } else { index = layoutDirectionCombo.indexOf(DEFAULT_DIR); } return index; } private int getLayoutDirectionInteger(int index) { int layoutDir; if (index == layoutDirectionCombo.indexOf(LTR_DIR)) { layoutDir = SWT.LEFT_TO_RIGHT; } else if (index == layoutDirectionCombo.indexOf(RTL_DIR)) { layoutDir = SWT.RIGHT_TO_LEFT; } else { layoutDir = SWT.NONE; } return layoutDir; } private static Combo addComboBox(Composite parent, String label, int indent) { Label labelControl = new Label(parent, SWT.LEFT); GridData gd = new GridData(); gd.horizontalIndent = indent; labelControl.setLayoutData(gd); labelControl.setText(label); Combo comboBox = new Combo(parent, SWT.READ_ONLY); return comboBox; } private static void createSpace(Composite parent) { Label vfiller = new Label(parent, SWT.LEFT); GridData gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL); gridData.horizontalSpan = 2; GC gc = new GC(parent); gridData.heightHint = Dialog.convertHeightInCharsToPixels(gc.getFontMetrics(), 1) / 2; gc.dispose(); vfiller.setLayoutData(gridData); } @Override protected IPreferenceStore doGetPreferenceStore() { return WorkbenchPlugin.getDefault().getPreferenceStore(); } /** * @see IWorkbenchPreferencePage */ @Override public void init(IWorkbench aWorkbench) { IPreferenceStore store = getPreferenceStore(); layoutDirection = store.getInt(IPreferenceConstants.LAYOUT_DIRECTION); bidiSupport = store.getBoolean(IPreferenceConstants.BIDI_SUPPORT); textDirection = store.getString(IPreferenceConstants.TEXT_DIRECTION); } /** * The default button has been pressed. */ @Override protected void performDefaults() { IPreferenceStore store = getPreferenceStore(); nlExtensionsField.setStringValue(store.getDefaultString(IPreferenceConstants.NL_EXTENSIONS)); layoutDirection = store.getDefaultInt(IPreferenceConstants.LAYOUT_DIRECTION); bidiSupport = store.getDefaultBoolean(IPreferenceConstants.BIDI_SUPPORT); textDirection = store.getDefaultString(IPreferenceConstants.TEXT_DIRECTION); layoutDirectionCombo.select(getLayoutDirectionIndex(layoutDirection)); bidiSupportClickButton.setSelection(bidiSupport); textDirectionCombo.select(getTextDirectionIndex(textDirection)); textDirectionCombo.setEnabled(bidiSupport); super.performDefaults(); } /** * The user has pressed Ok. Store/apply this page's values appropriately. */ @Override public boolean performOk() { IPreferenceStore store = getPreferenceStore(); store.setValue(IPreferenceConstants.NL_EXTENSIONS, nlExtensionsField.getStringValue()); store.setValue(IPreferenceConstants.LAYOUT_DIRECTION, layoutDirection); store.setValue(IPreferenceConstants.BIDI_SUPPORT, bidiSupport); store.setValue(IPreferenceConstants.TEXT_DIRECTION, textDirection); Window.setDefaultOrientation(layoutDirection); BidiUtils.setBidiSupport(bidiSupport); BidiUtils.setTextDirection(textDirection.isEmpty() ? null : textDirection); PrefUtil.savePrefs(); return true; } }