Java tutorial
/******************************************************************************* * All Right Reserved. Copyright (c) 1998, 2004 Jackwind Li Guojie * * Created on Mar 3, 2004 7:53:44 PM by JACK $Id$ * ******************************************************************************/ import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.Arrays; import java.util.Comparator; import org.eclipse.jface.action.Action; import org.eclipse.jface.action.Separator; import org.eclipse.jface.action.ToolBarManager; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.TableEditor; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.MessageBox; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.TableColumn; import org.eclipse.swt.widgets.TableItem; import org.eclipse.swt.widgets.Text; import org.eclipse.swt.widgets.ToolBar; public class BugTracker { Display display = new Display(); Shell shell = new Shell(display); Table table; Image bugIcon = new Image(shell.getDisplay(), "java2s.gif"); public BugTracker() { GridLayout gridLayout = new GridLayout(); shell.setLayout(gridLayout); shell.setText("Bug Tracking System"); // Action. Action actionAddNew = new Action("New bug") { public void run() { // Append. TableItem item = new TableItem(table, SWT.NULL); item.setImage(bugIcon); table.select(table.getItemCount() - 1); } }; Action actionDelete = new Action("Delete selected") { public void run() { int index = table.getSelectionIndex(); if (index < 0) { System.out.println("Please select an item first. "); return; } MessageBox messageBox = new MessageBox(shell, SWT.YES | SWT.NO); messageBox.setText("Confirmation"); messageBox.setMessage("Are you sure to remove the bug with id #" + table.getItem(index).getText(0)); if (messageBox.open() == SWT.YES) { table.remove(index); } } }; Action actionSave = new Action("Save") { public void run() { saveBugs(); } }; ToolBar toolBar = new ToolBar(shell, SWT.RIGHT | SWT.FLAT); ToolBarManager manager = new ToolBarManager(toolBar); manager.add(actionAddNew); manager.add(actionDelete); manager.add(new Separator()); manager.add(actionSave); manager.update(true); table = new Table(shell, SWT.BORDER | SWT.FULL_SELECTION); table.setLayoutData(new GridData(GridData.FILL_BOTH)); table.setLinesVisible(true); table.setHeaderVisible(true); TableColumn tcID = new TableColumn(table, SWT.LEFT); tcID.setText("ID"); TableColumn tcSummary = new TableColumn(table, SWT.NULL); tcSummary.setText("Summary"); TableColumn tcAssignedTo = new TableColumn(table, SWT.NULL); tcAssignedTo.setText("Assigned to"); TableColumn tcSolved = new TableColumn(table, SWT.NULL); tcSolved.setText("Solved"); tcID.setWidth(60); tcSummary.setWidth(200); tcAssignedTo.setWidth(80); tcSolved.setWidth(50); table.pack(); // Table editor. final TableEditor editor = new TableEditor(table); table.addListener(SWT.MouseDown, new Listener() { public void handleEvent(Event event) { // Locate the cell position. Point point = new Point(event.x, event.y); final TableItem item = table.getItem(point); if (item == null) return; int column = -1; for (int i = 0; i < table.getColumnCount(); i++) { Rectangle rect = item.getBounds(i); if (rect.contains(point)) column = i; } if (column != 3) return; // Cell position located, now open the table editor. final Button button = new Button(table, SWT.CHECK); button.setSelection(item.getText(column).equalsIgnoreCase("YES")); editor.horizontalAlignment = SWT.LEFT; editor.grabHorizontal = true; editor.setEditor(button, item, column); final int selectedColumn = column; Listener buttonListener = new Listener() { public void handleEvent(final Event e) { switch (e.type) { case SWT.FocusOut: item.setText(selectedColumn, button.getSelection() ? "YES" : "NO"); button.dispose(); break; case SWT.Traverse: switch (e.detail) { case SWT.TRAVERSE_RETURN: item.setText(selectedColumn, button.getSelection() ? "YES" : "NO"); //FALL THROUGH case SWT.TRAVERSE_ESCAPE: button.dispose(); e.doit = false; } break; } } }; button.addListener(SWT.FocusOut, buttonListener); button.addListener(SWT.Traverse, buttonListener); button.setFocus(); } }); table.addListener(SWT.MouseDown, new Listener() { public void handleEvent(Event event) { // Locate the cell position. Point point = new Point(event.x, event.y); final TableItem item = table.getItem(point); if (item == null) return; int column = -1; for (int i = 0; i < table.getColumnCount(); i++) { Rectangle rect = item.getBounds(i); if (rect.contains(point)) column = i; } if (column < 0 || column >= 3) return; // Cell position located, now open the table editor. final Text text = new Text(table, SWT.NONE); text.setText(item.getText(column)); editor.horizontalAlignment = SWT.LEFT; editor.grabHorizontal = true; editor.setEditor(text, item, column); final int selectedColumn = column; Listener textListener = new Listener() { public void handleEvent(final Event e) { switch (e.type) { case SWT.FocusOut: item.setText(selectedColumn, text.getText()); text.dispose(); break; case SWT.Traverse: switch (e.detail) { case SWT.TRAVERSE_RETURN: item.setText(selectedColumn, text.getText()); //FALL THROUGH case SWT.TRAVERSE_ESCAPE: text.dispose(); e.doit = false; } break; } } }; text.addListener(SWT.FocusOut, textListener); text.addListener(SWT.Traverse, textListener); text.setFocus(); } }); loadBugs(); table.addListener(SWT.Selection, new Listener() { public void handleEvent(Event event) { System.out.println("Selected: " + table.getSelection()[0]); } }); Listener sortListener = new Listener() { public void handleEvent(Event event) { if (!(event.widget instanceof TableColumn)) return; TableColumn tc = (TableColumn) event.widget; sortTable(table, table.indexOf(tc)); System.out.println("The table is sorted by column #" + table.indexOf(tc)); } }; for (int i = 0; i < table.getColumnCount(); i++) ((TableColumn) table.getColumn(i)).addListener(SWT.Selection, sortListener); shell.pack(); shell.open(); //textUser.forceFocus(); // Set up the event loop. while (!shell.isDisposed()) { if (!display.readAndDispatch()) { // If no more entries in event queue display.sleep(); } } display.dispose(); } /** * Sorts the given table by the specified column. * @param columnIndex */ public static void sortTable(Table table, int columnIndex) { if (table == null || table.getColumnCount() <= 1) return; if (columnIndex < 0 || columnIndex >= table.getColumnCount()) throw new IllegalArgumentException("The specified column does not exist. "); final int colIndex = columnIndex; Comparator comparator = new Comparator() { public int compare(Object o1, Object o2) { return ((TableItem) o1).getText(colIndex).compareTo(((TableItem) o2).getText(colIndex)); } public boolean equals(Object obj) { return false; } }; TableItem[] tableItems = table.getItems(); Arrays.sort(tableItems, comparator); for (int i = 0; i < tableItems.length; i++) { TableItem item = new TableItem(table, SWT.NULL); for (int j = 0; j < table.getColumnCount(); j++) { item.setText(j, tableItems[i].getText(j)); item.setImage(j, tableItems[i].getImage(j)); } tableItems[i].dispose(); } } private void saveBugs() { // Save bugs to a file. DataOutputStream out = null; try { File file = new File("bugs.dat"); out = new DataOutputStream(new FileOutputStream(file)); for (int i = 0; i < table.getItemCount(); i++) { TableItem item = table.getItem(i); out.writeUTF(item.getText(0)); out.writeUTF(item.getText(1)); out.writeUTF(item.getText(2)); out.writeBoolean(item.getText(3).equalsIgnoreCase("YES")); } } catch (IOException ioe) { // Ignore. } finally { try { if (out != null) out.close(); } catch (IOException e) { e.printStackTrace(); } } } private void loadBugs() { // Load bugs from a file. DataInputStream in = null; try { File file = new File("bugs.dat"); if (!file.exists()) return; in = new DataInputStream(new FileInputStream(file)); while (true) { String id = in.readUTF(); String summary = in.readUTF(); String assignedTo = in.readUTF(); boolean solved = in.readBoolean(); TableItem item = new TableItem(table, SWT.NULL); item.setImage(bugIcon); item.setText(new String[] { id, summary, assignedTo, solved ? "Yes" : "No" }); } } catch (IOException ioe) { // Ignore. } finally { try { if (in != null) in.close(); } catch (IOException e) { e.printStackTrace(); } } } public static void main(String[] args) { new BugTracker(); } }