SWT表通过单击列标题进行排序

在swt表中，为Strings排序工作如何对Integer，Double和Date值进行排序。 这仅适用于String升序。 任何人都可以提出更好的方法来做到这一点。

TableItem item = new TableItem(table, SWT.NONE); item.setText(new String[] { "1", "v", "1.1", "20/03/2013" }); item = new TableItem(table, SWT.NONE); item.setText(new String[] { "10", "z", "1.5", "20/04/2013" }); item = new TableItem(table, SWT.NONE); item.setText(new String[] { "3", "a", "1.3", "30/01/2013" }); Listener sortListener = new Listener() { public void handleEvent(Event e) { TableItem[] items = table.getItems(); Collator collator = Collator.getInstance(Locale.getDefault()); TableColumn column = (TableColumn) e.widget; int index = column == tblclmnNumber ? 0 : 1; for (int i = 1; i < items.length; i++) { String value1 = items[i].getText(index); for (int j = 0; j < i; j++) { String value2 = items[j].getText(index); if (collator.compare(value1, value2) < 0) { String[] values = { items[i].getText(0), items[i].getText(1), items[i].getText(2), items[i].getText(3) }; items[i].dispose(); TableItem item = new TableItem(table, SWT.NONE, j); item.setText(values); items = table.getItems(); break; } } } table.setSortColumn(column); } }; tblclmnNumber.addListener(SWT.Selection, sortListener); tblclmnName.addListener(SWT.Selection, sortListener); tblclmnDeci.addListener(SWT.Selection, sortListener); tblclmnDate.addListener(SWT.Selection, sortListener); table.setSortColumn(tblclmnNumber); table.setSortDirection(SWT.UP); 

Answer 1

我已经使用排序修改了SWT代码段，以显示如何使用不同的数据类型对列进行排序。

 /* * Table example snippet: sort a table by column * * For a list of all SWT example snippets see * http://www.eclipse.org/swt/snippets/ * * @since 3.2 */ import java.text.SimpleDateFormat; import java.util.Arrays; import java.util.Comparator; import java.util.Date; import org.eclipse.swt.SWT; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.TableColumn; import org.eclipse.swt.widgets.TableItem; public class SortTable { private TableRow rows[] = new TableRow[] { new TableRow(1, "aaa", new Date(1363784269000L)), new TableRow(2, "abc", new Date(1367784269000L)), new TableRow(3, "efc", new Date(1363584269000L)), new TableRow(4, "ccc", new Date(1363734269000L)), }; private Table table; private TableColumn intColumn; private TableColumn strColumn; private TableColumn dateColumn; public SortTable() { Display display = new Display(); Shell shell = new Shell(display); shell.setLayout(new FillLayout()); table = new Table(shell, SWT.BORDER); table.setHeaderVisible(true); intColumn = new TableColumn(table, SWT.NONE); intColumn.setText("int"); intColumn.setWidth(50); strColumn = new TableColumn(table, SWT.NONE); strColumn.setText("string"); strColumn.setWidth(50); dateColumn = new TableColumn(table, SWT.NONE); dateColumn.setText("date"); dateColumn.setWidth(100); updateTable(); Listener sortListener = new Listener() { public void handleEvent(Event e) { TableColumn column = (TableColumn) e.widget; if (column == intColumn) Arrays.sort(rows, BY_VAL); if (column == strColumn) Arrays.sort(rows, BY_STR); if (column == dateColumn) Arrays.sort(rows, BY_DATE); table.setSortColumn(column); updateTable(); } }; intColumn.addListener(SWT.Selection, sortListener); strColumn.addListener(SWT.Selection, sortListener); dateColumn.addListener(SWT.Selection, sortListener); shell.setSize(shell.computeSize(SWT.DEFAULT, SWT.DEFAULT).x, 300); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); } private void updateTable() { table.removeAll(); for (TableRow row : rows) { TableItem item = new TableItem(table, SWT.NONE); item.setText(row.asString()); } } public final Comparator BY_VAL = new Comparator() { @Override public int compare(TableRow o1, TableRow o2) { if (o1.val < o2.val) return -1; if (o1.val > o2.val) return 1; return 0; } }; public final Comparator BY_STR = new Comparator() { @Override public int compare(TableRow o1, TableRow o2) { return o1.str.compareTo(o2.str); } }; public final Comparator BY_DATE = new Comparator() { @Override public int compare(TableRow o1, TableRow o2) { return o1.date.compareTo(o2.date); } }; private class TableRow { private int val; private String str; private Date date; private SimpleDateFormat format = new SimpleDateFormat(); public TableRow(int val, String str, Date date) { this.val = val; this.str = str; this.date = date; } public String[] asString() { return new String[] {Integer.toString(val), str, format.format(date)}; } } public static void main(String[] args) { new SortTable(); } } 

总结它完全取决于程序员如何对表中的列进行排序，因为表总是想要一行的String数组，无论它们是什么意思。

Answer 2

您可以将列的比较器作为数据添加到列中，然后使用它进行排序。 这使排序逻辑更接近列本身的定义。

 intColumn = new TableColumn(table, SWT.NONE); intColumn.setText("int"); intColumn.setWidth(50); intColumn.setData(new Comparator() { @Override public int compare(TableItem t1, TableItem t2) { int i1 = Integer.parseInt(t1.getText(0)); int i2 = Integer.parseInt(t2.getText(0)); if (i1.val < i2.val) return -1; if (i1.val > i2.val) return 1; return 0; } }; strColumn = new TableColumn(table, SWT.NONE); strColumn.setText("string"); strColumn.setWidth(50); strColumn.setData(new Comparator() { @Override public int compare(TableItem t1, TableItem t2) { return t1.getText(1).compareTo(t2.getText(1)); } }; dateColumn = new TableColumn(table, SWT.NONE); dateColumn.setText("date"); dateColumn.setWidth(100); dateColumn.setData(new Comparator() { @Override public int compare(TableItem t1, TableItem t2) { return Date.parse(t1.getText(2)).compareTo(Date.parse(t2.getText(2))); } }; Listener sortListener = e -> { TableColumn sortColumn = table.getSortColumn(); TableColumn selectedColumn = (TableColumn) e.widget; int dir = table.getSortDirection(); if (sortColumn == selectedColumn) { dir = dir == SWT.UP ? SWT.DOWN : SWT.UP; } else { table.setSortColumn(selectedColumn); dir = SWT.UP; } TableItem[] items = table.getItems(); final Comparator comparator = (Comparator) selectedColumn.getData(); for (int i = 1; i < items.length; i++) { for (int j = 0; j < i; j++) { if ((comparator.compare(items[i], items[j]) < 0 && dir == SWT.UP) || (comparator.compare(items[i], items[j]) > 0 && dir == SWT.DOWN)) { String[] oldItem = new String[table.getColumnCount()]; for (int h = 0; h < table.getColumnCount(); h++) { item[h] = items[i].getText(h); } items[i].dispose(); TableItem newItem = new TableItem(table, SWT.NONE, j); newItem.setText(oldItem); items = table.getItems(); break; } } } table.setSortDirection(dir); };