Java tutorial
/******************************************************************************* * Copyright (c) 2004 Actuate Corporation. * 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: * Actuate Corporation - initial API and implementation *******************************************************************************/ package org.eclipse.birt.report.designer.internal.ui.dialogs; import java.util.ArrayList; import java.util.List; import java.util.logging.Logger; import org.eclipse.birt.report.designer.nls.Messages; import org.eclipse.birt.report.designer.ui.dialogs.StyleBuilder; import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.preference.FieldEditor; import org.eclipse.jface.preference.FieldEditorPreferencePage; import org.eclipse.jface.preference.IPreferenceStore; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.jface.util.PropertyChangeEvent; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.Point; 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.Label; /** * Provides default implementation for all Style preference pages */ public abstract class BaseStylePreferencePage extends FieldEditorPreferencePage { protected Logger logger = Logger.getLogger(BaseStylePreferencePage.class.getName()); /* * (non-Javadoc) * * @see * org.eclipse.jface.preference.FieldEditorPreferencePage#createFieldEditors * () */ protected void createFieldEditors() { noDefaultButton(); } private Label descriptionLabel; private Control body; private boolean createDefaultButton = true; private Button defaultsButton; protected void noDefaultButton() { createDefaultButton = false; } public void createControl(Composite parent) { GridData gd; Composite content = new Composite(parent, SWT.NONE); setControl(content); GridLayout layout = new GridLayout(); layout.marginWidth = 0; layout.marginHeight = 0; content.setLayout(layout); // Apply the font on creation for backward compatibility applyDialogFont(content); // initialize the dialog units initializeDialogUnits(content); descriptionLabel = createDescriptionLabel(content); if (descriptionLabel != null) { descriptionLabel.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); } body = createContents(content); if (body != null) { // null is not a valid return value but support graceful failure body.setLayoutData(new GridData(GridData.FILL_BOTH)); } Composite buttonBar = new Composite(content, SWT.NONE); layout = new GridLayout(); layout.numColumns = 0; layout.marginHeight = 0; layout.marginWidth = 0; layout.makeColumnsEqualWidth = false; buttonBar.setLayout(layout); gd = new GridData(GridData.HORIZONTAL_ALIGN_END); buttonBar.setLayoutData(gd); contributeButtons(buttonBar); if (createDefaultButton) { layout.numColumns = layout.numColumns + 1; String[] labels = JFaceResources.getStrings(new String[] { "defaults", "apply" }); //$NON-NLS-2$//$NON-NLS-1$ int widthHint = convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH); defaultsButton = new Button(buttonBar, SWT.PUSH); defaultsButton.setText(labels[0]); Dialog.applyDialogFont(defaultsButton); GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL); Point minButtonSize = defaultsButton.computeSize(SWT.DEFAULT, SWT.DEFAULT, true); data.widthHint = Math.max(widthHint, minButtonSize.x); defaultsButton.setLayoutData(data); defaultsButton.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { performDefaults(); } }); applyDialogFont(buttonBar); } else { /* * Check if there are any other buttons on the button bar. If not, * throw away the button bar composite. Otherwise there is an * unusually large button bar. */ if (buttonBar.getChildren().length < 1) { buttonBar.dispose(); } } } protected Point doComputeSize() { if (descriptionLabel != null && body != null) { Point bodySize = body.computeSize(SWT.DEFAULT, SWT.DEFAULT, true); GridData gd = (GridData) descriptionLabel.getLayoutData(); gd.widthHint = bodySize.x; } return getControl().computeSize(SWT.DEFAULT, SWT.DEFAULT, true); } /** * The constructor. * * @param style */ protected BaseStylePreferencePage(Object model) { super(FieldEditorPreferencePage.GRID); setTitle(Messages.getString("BaseStylePreferencePage.displayname.Title")); //$NON-NLS-1$ // Set the preference store for the preference page. IPreferenceStore store = new StylePreferenceStore(model); setPreferenceStore(store); } public void propertyChange(PropertyChangeEvent event) { if (getBuilder() != null) { getBuilder().refreshPagesStatus(); } } /* * (non-Javadoc) * * @see org.eclipse.jface.preference.FieldEditorPreferencePage#performOk() */ public boolean performOk() { IPreferenceStore ps = getPreferenceStore(); if (ps instanceof StylePreferenceStore) { ((StylePreferenceStore) ps).clearError(); } boolean rt = super.performOk(); if (ps instanceof StylePreferenceStore) { return !((StylePreferenceStore) ps).hasError(); } return rt; } protected Button getDefaultsButton() { return defaultsButton; } private StyleBuilder builder; public StyleBuilder getBuilder() { return builder; } public void setBuilder(StyleBuilder builder) { this.builder = builder; } public void setErrorMessage(String newMessage) { if (builder != null) builder.setErrorMessage(newMessage); else { super.setErrorMessage(newMessage); if (getContainer() != null) { getContainer().updateMessage(); } } } protected abstract String[] getPreferenceNames(); private boolean firstCheck = false; protected boolean hasLocaleProperty = false; public boolean hasLocaleProperties() { if (!firstCheck) { firstCheck = true; String[] fields = getPreferenceNames(); if (fields != null) { for (int i = 0; i < fields.length; i++) { if (getPreferenceStore() instanceof StylePreferenceStore) { StylePreferenceStore store = (StylePreferenceStore) getPreferenceStore(); if (store.hasLocalValue(fields[i])) { hasLocaleProperty = true; return true; } } } } } else { if (fields != null) { for (int i = 0; i < fields.size(); i++) { FieldEditor editor = (FieldEditor) fields.get(i); if (editor instanceof AbstractFieldEditor) { if (((AbstractFieldEditor) editor).hasLocaleValue()) return true; } } return false; } } return hasLocaleProperty; } private List fields; protected void addField(FieldEditor editor) { if (fields == null) { fields = new ArrayList(); } fields.add(editor); super.addField(editor); } }