Java tutorial
/******************************************************************************* * Copyright (c) 2010 Martin Schnabel <mb0@mb0.org>. * 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 ******************************************************************************/ package org.axdt.asdoc.ui.preferences; import java.net.URI; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import java.util.regex.Pattern; import org.axdt.asdoc.ui.AsdocUiActivator; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.Status; import org.eclipse.jface.dialogs.StatusDialog; import org.eclipse.jface.layout.TableColumnLayout; import org.eclipse.jface.preference.FieldEditor; import org.eclipse.jface.viewers.ArrayContentProvider; import org.eclipse.jface.viewers.CellLabelProvider; import org.eclipse.jface.viewers.ColumnLabelProvider; import org.eclipse.jface.viewers.ColumnLayoutData; import org.eclipse.jface.viewers.ColumnWeightData; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.TableViewerColumn; import org.eclipse.jface.window.Window; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.SashForm; import org.eclipse.swt.events.ControlAdapter; import org.eclipse.swt.events.ControlEvent; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; 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; import org.eclipse.swt.widgets.Layout; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; import org.eclipse.swt.widgets.Widget; import com.google.common.collect.Lists; public class DocTableFieldEditor extends FieldEditor { private Composite baseComp; private TableViewer tableViewer; public DocTableFieldEditor(String name, String labelText, Composite comp) { super(name, labelText, comp); } @Override protected void adjustForNumColumns(int numColumns) { GridData layoutData = (GridData) baseComp.getLayoutData(); layoutData.horizontalSpan = numColumns; } protected Composite createBaseComposite(Composite parent, int numColumns) { Composite result = new Composite(parent, SWT.NONE); GridData gd = new GridData(GridData.FILL_BOTH); gd.horizontalSpan = numColumns; result.setLayoutData(gd); result.setLayout(new GridLayout(1, false)); return result; } protected Label createLabel(Composite parent) { Label labelControl = getLabelControl(parent); labelControl.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); return labelControl; } protected SashForm createSashForm(Composite parent) { final SashForm splitComp = new SashForm(parent, SWT.NONE); splitComp.setLayoutData(new GridData(GridData.FILL_BOTH)); splitComp.addControlListener(new ControlAdapter() { @Override public void controlResized(ControlEvent e) { int width = splitComp.getBounds().width; double percent = (width - 100.0) / width; int weight = (int) Math.round(percent * 100); splitComp.setWeights(new int[] { weight, 100 - weight }); } }); return splitComp; } protected TableViewer createTableViewer(Composite parent) { Composite tableComp = new Composite(parent, SWT.NONE); tableComp.setLayout(new TableColumnLayout()); TableViewer tableViewer = new TableViewer(tableComp, SWT.MULTI | SWT.BORDER | SWT.FULL_SELECTION); tableViewer.setContentProvider(new ArrayContentProvider()); tableViewer.getTable().setHeaderVisible(true); tableViewer.getTable().setLinesVisible(true); createTableViwerColumn(tableViewer, "Name", new ColumnLabelProvider() { @Override public String getText(Object element) { if (element instanceof DocItem) { DocItem item = (DocItem) element; return item.name; } return super.getText(element); } }, new ColumnWeightData(1, 50, true)); createTableViwerColumn(tableViewer, "Url", new ColumnLabelProvider() { @Override public String getText(Object element) { if (element instanceof DocItem) { DocItem item = (DocItem) element; return item.url; } return super.getText(element); } }, new ColumnWeightData(5, 250, true)); return tableViewer; } private void createTableViwerColumn(TableViewer tableViewer2, String string, CellLabelProvider labelProvider, ColumnLayoutData layoutData) { TableViewerColumn viewerNameColumn = new TableViewerColumn(tableViewer2, SWT.NONE); viewerNameColumn.getColumn().setText(string); viewerNameColumn.setLabelProvider(labelProvider); Layout layout = tableViewer2.getControl().getParent().getLayout(); if (layout instanceof TableColumnLayout) { ((TableColumnLayout) layout).setColumnData(viewerNameColumn.getColumn(), layoutData); } } protected Button createButton(Composite parent, String label, SelectionListener listener) { Button button = new Button(parent, SWT.PUSH); button.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); button.setText(label); button.addSelectionListener(listener); return button; } protected Composite createButtons(Composite parent) { Composite buttonsComp = new Composite(parent, SWT.NONE); buttonsComp.setLayout(new GridLayout(1, true)); createButton(buttonsComp, "Add", new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { DocItem item = new DocItem("New", ""); boolean doAdd = doEdit(item); if (doAdd) { Object[] input = (Object[]) tableViewer.getInput(); List<Object> list = new ArrayList<Object>(); list.addAll(Arrays.asList(input)); list.add(item); tableViewer.setInput(list.toArray()); } } }); createButton(buttonsComp, "Remove", new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { IStructuredSelection selection = (IStructuredSelection) tableViewer.getSelection(); Object firstElement = selection.getFirstElement(); Object[] input = (Object[]) tableViewer.getInput(); List<Object> list = new ArrayList<Object>(); list.addAll(Arrays.asList(input)); list.remove(firstElement); tableViewer.setInput(list.toArray()); } }); createButton(buttonsComp, "Edit", new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { IStructuredSelection selection = (IStructuredSelection) tableViewer.getSelection(); Object firstElement = selection.getFirstElement(); if (firstElement instanceof DocItem) { doEdit((DocItem) firstElement); tableViewer.refresh(); } } }); return buttonsComp; } protected boolean doEdit(DocItem item) { EditDialog dialog = new EditDialog(tableViewer.getControl().getShell(), item.name, item.url); if (dialog.open() == Window.OK) { IStatus status = dialog.getStatus(); if (status.getCode() == IStatus.OK) { item.name = dialog.getNameText(); item.url = dialog.getUrlText(); return true; } } return false; } @Override protected void doFillIntoGrid(Composite parent, int numColumns) { baseComp = createBaseComposite(parent, numColumns); createLabel(baseComp); SashForm sashForm = createSashForm(baseComp); tableViewer = createTableViewer(sashForm); createButtons(sashForm); } @Override protected void doLoad() { if (tableViewer != null) { String value = getPreferenceStore().getString(getPreferenceName()); Object[] objects = deserializeValue(value); tableViewer.setInput(objects); } } @Override protected void doLoadDefault() { if (tableViewer != null) { String value = getPreferenceStore().getDefaultString(getPreferenceName()); Object[] objects = deserializeValue(value); tableViewer.setInput(objects); } } protected static Object[] deserializeValue(String value) { List<DocItem> list = deserializeList(value); return list.toArray(); } protected static List<DocItem> deserializeList(String value) { List<DocItem> list = Lists.newArrayList(); if (value == null) return list; value = value.trim(); if (value.length() == 0) return list; if (Pattern.matches("('[^']*')([,;]('[^']*'))*", value)) { // rows for (String part : value.split(";")) { // items String[] items = part.split(","); if (items.length == 0) continue; String item = items[0].substring(1, items[0].length() - 1); if (items.length == 1) { list.add(new DocItem("New", item)); } else if (items.length == 2) { String url = items[1].substring(1, items[1].length() - 1); list.add(new DocItem(item, url)); } } } else { // try to reconstruct from old schema for (String part : value.split(" ;,")) { list.add(new DocItem("New", part)); } } return list; } protected static String serializeValue(Object[] items) { StringBuilder value = new StringBuilder(); for (Object item : items) { if (value.length() != 0) value.append(";"); value.append(item.toString()); } return value.toString(); } @Override protected void doStore() { Object[] items = (Object[]) tableViewer.getInput(); getPreferenceStore().setValue(getPreferenceName(), serializeValue(items)); } @Override public int getNumberOfControls() { return 1; } public static class DocItem { public String url; public String name; public IStatus status = null; public String asdocUrl = null; public DocItem(String name, String url) { this.name = name; this.url = url; } @Override public String toString() { StringBuilder builder = new StringBuilder(); builder.append('\'').append(name).append('\''); builder.append(','); builder.append('\'').append(url).append('\''); return builder.toString(); } } public static class EditDialog extends StatusDialog { private Text nameText; private Text urlText; private String name; private String url; public EditDialog(Shell parent, String initialName, String initialUrl) { super(parent); this.name = initialName; this.url = initialUrl; } public String getUrlText() { return url; } public String getNameText() { return name; } @Override protected Control createDialogArea(Composite ancestor) { Composite parent = new Composite(ancestor, SWT.NONE); parent.setLayout(new GridLayout(2, false)); ModifyListener listener = new ModifyListener() { public void modifyText(ModifyEvent e) { doTextChanged(e.widget); } }; Label description = createLabel(parent, "Please add a name and a valid url to an asdoc folder."); GridData gd = new GridData(GridData.FILL_HORIZONTAL); gd.horizontalSpan = 2; description.setLayoutData(gd); createLabel(parent, "Name"); nameText = createText(parent, name); nameText.addModifyListener(listener); createLabel(parent, "Url"); urlText = createText(parent, url); urlText.addModifyListener(listener); return parent; } @Override public void create() { super.create(); updateStatus(checkValid()); } protected void doTextChanged(Widget widget) { updateStatus(checkValid()); } public IStatus checkValid() { if (nameText == null || urlText == null) return EditDialogStatus.INVALID_STATUS; name = nameText.getText().trim(); url = urlText.getText().trim(); if (name == null || url == null) return EditDialogStatus.INVALID_STATUS; if (name.length() == 0) return EditDialogStatus.getInvalidStatus("name must be set"); if (url.length() == 0) return EditDialogStatus.getInvalidStatus("url must be set"); try { URI uri = URI.create(url); if (!uri.isAbsolute()) return EditDialogStatus.getInvalidStatus("url must be absolute"); } catch (Exception e) { return EditDialogStatus.getInvalidStatus("url must be valid"); } return EditDialogStatus.OK_STATUS; } private Label createLabel(Composite parent, String string) { Label label = new Label(parent, SWT.NONE); label.setText(string); label.setLayoutData(new GridData()); return label; } private Text createText(Composite parent, String string) { Text text = new Text(parent, SWT.BORDER); text.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); text.setText(string); return text; } } public static class EditDialogStatus extends Status { public static final IStatus INVALID_STATUS = getInvalidStatus("Error"); public EditDialogStatus(int severity, String pluginId, int code, String message, Throwable exception) { super(severity, pluginId, code, message, exception); } public static IStatus getInvalidStatus(String message) { return getInvalidStatus(message, null); } public static IStatus getInvalidStatus(String message, Throwable exception) { return new EditDialogStatus(ERROR, AsdocUiActivator.PLUGIN_ID, ERROR, message, exception); } } }