TablesSWT使用Table、TableColumn和TableItem这3个独立的类来构建table.这3个类都不需要被继承.*****Creating TablesTable类只提供了一个构造方法:public Table(Composite parent, int style)下表显示了style的作用,在构造方法中允许用逻辑与操作符表示style.Style DescriptionSWT.SINGLE 一次只能选择一行,默认的参数.SWT.MULTI 一次能选择多行,一般是使用Ctrl+鼠标实现选择多行.SWT.CHECK 将放置一个checkbox在每行的最开头处.注意checkbox 的选择状态与表格行是否处于被选择的状态无关. SWT.FULL_SELECTION 当表格行被选择时,高亮显示,而不是默认的只显示第一列.SWT.HIDE_SELECTIN 当表格所在的窗口不是当前的窗口时,除去被选择行的高亮 显示.默认的是无论表格所在窗口是否为当前窗口都使被选 择行处于高亮显示. *****Adding ColumnsTableColumn类表示表格里的一列,你创建一列使用一个parent table, a style,和一个可选的index.如果你不设置index,那么这列就将被默认把index设置为0.TableColumn的构造方法:public TableColumn(Table parent, int style)public TableColumn(Table parent, int style, int index)所有设置表格列的内容的对齐参数有:SWT.LEFT 左对齐SWT.CENTER 居中SWT.RIGHT 右对齐只能设置其中一个参数,如果设置了多于一个参数，后果将不确定.可以在构造方法后改变对齐:通过setAlignment()方法.默认对齐是左对齐并且影响在这列中所有的行.表格列能够显示标题.每个标题只能显示一行,它将按照ASC2码显示字符.parent table可以通过setHeadersVisible()方法控制标题是否显示.*****Adding Rows构造方法:TableItem(Table parent, int style)TableItem(Table parent, int style, int index)使用第2个参数在表格中插入行,将已经存在的行往后移,如果传入的参数超过范围就抛出IllegalArgumentException.比如,如果没有行存在与table中,这样写的话:new TableItem(table, SWT.NONE, 1);结果如下:java.lang.IllegalArgumentException: Index out of bounds没有style提供给TableItem,所以你必须经常传递SWT.NONE参数以忽略其它值.你可以改变TableItem的前景颜色和背景颜色,以整行宽或者一个单元格宽都可以.单元格能够显示文字,图片,或者两者都显示.如果你两者都设置了,图片将显示在文字的左方.*****示例程序:import org.eclipse.swt.*;import org.eclipse.swt.graphics.Font;import org.eclipse.swt.graphics.Color;import org.eclipse.swt.layout.*;import org.eclipse.swt.widgets.*;/** * Displays ASCII Codes */public class AsciiTable { // The number of characters to show. private static final int MAX_CHARS = 128; // Names for each of the columns private static final String[] COLUMN_NAMES = { "Char", "Dec", "Hex", "Oct", "Bin", "Name"}; // The names of the first 32 characters private static final String[] CHAR_NAMES = { "NUL", "SOH", "STX", "ETX", "EOT", "ENQ", "ACK", "BEL", "BS", "TAB", "LF", "VT", "FF", "CR", "SO", "SI", "DLE", "DC1", "DC2", "DC3", "DC4", "NAK", "SYN", "ETB", "CAN", "EM", "SUB", "ESC", "FS", "GS", "RS", "US", "Space"}; // The font to use for displaying characters private Font font; // The background colors to use for the rows private Color[] colors = new Color[MAX_CHARS]; /** * Runs the application */ public void run() { Display display = new Display(); Shell shell = new Shell(display); shell.setText("ASCII Codes"); createContents(shell); shell.pack(); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } // Call dispose to dispose any resources // we have created dispose(); display.dispose(); } /** * Disposes the resources created */ private void dispose() { // We created this font; we must dispose it if (font != null) { font.dispose(); } // We created the colors; we must dispose them for (int i = 0, n = colors.length; i < n; i++) { if (colors[i] != null) { colors[i].dispose(); } } } /** * Creates the font */ private void createFont() { // Create a font that will display the range // of characters. "Terminal" works well in // Windows font = new Font(Display.getCurrent(), "Terminal", 10, SWT.NORMAL); } /** * Creates the columns for the table * * @param table the table * @return TableColumn[] */ private TableColumn[] createColumns(Table table) { TableColumn[] columns = new TableColumn[COLUMN_NAMES.length]; for (int i = 0, n = columns.length; i < n; i++) { // Create the TableColumn with right alignment columns[i] = new TableColumn(table, SWT.RIGHT); // This text will appear in the column header columns[i].setText(COLUMN_NAMES[i]); } return columns; } /** * Creates the window's contents (the table) * * @param composite the parent composite */ private void createContents(Composite composite) { composite.setLayout(new FillLayout()); // The system font will not display the lower 32 // characters, so create one that will createFont(); // Create a table with visible headers // and lines, and set the font that we // created Table table = new Table(composite, SWT.SINGLE | SWT.FULL_SELECTION); table.setHeaderVisible(true); table.setLinesVisible(true); table.setRedraw(false); table.setFont(font); // Create the columns TableColumn[] columns = createColumns(table); for (int i = 0; i < MAX_CHARS; i++) { // Create a background color for this row colors[i] = new Color(table.getDisplay(), 255 - i, 127 + i, i); // Create the row in the table by creating // a TableItem and setting text for each // column int c = 0; TableItem item = new TableItem(table, SWT.NONE); item.setText(c++, String.valueOf((char) i)); item.setText(c++, String.valueOf(i)); item.setText(c++, Integer.toHexString(i).toUpperCase()); item.setText(c++, Integer.toOctalString(i)); item.setText(c++, Integer.toBinaryString(i)); item.setText(c++, i < CHAR_NAMES.length ? CHAR_NAMES[i] : ""); item.setBackground(colors[i]); } // Now that we've set the text into the columns, // we call pack() on each one to size it to the // contents for (int i = 0, n = columns.length; i < n; i++) { columns[i].pack(); } // Set redraw back to true so that the table // will paint appropriately table.setRedraw(true); } /** * The application entry point * * @param args the command line arguments */ public static void main(String[] args) { new AsciiTable().run(); }}*****Sorting Tables用户希望能通过点击表格标题使每行按照列排序,以升序或者降序交替.SWT表格不会自动做这些事,但是可以通过编程实现,要实现排序,你可以按照下面的步骤:1.为列标题栏增加一个listener,这样可以侦察到标题栏被鼠标点击.2.取得现在要排序的信息.(按哪一列排序,按哪个方向排序--升序或降序)3.对数据进行排序并且重新显示.*****小结如果你是一个Swing develloper,你一定会取笑SWT表格这种排序方法:取得数据,排序,然后重新填入.用SWT编程意味着在widget level上,使用data(model),view,并且意味着view和controller不可分割.象Swing的表格那样将data和view分离,并且用MVC模式使用controller,使表格排序更加直接.但是记住虽然SWT是在widget的level上,但是JFace提供了一个在SWT之上的MVC层次编程,从而使在JFace中编程变得象Swing一样简单.
