TableViewer Tutorial
TableViewer是一个比较常用的Viewer，它是对SWT Table的一个封装。
模型
Library library = new Library("Center Public Library");
library.addBook(new Book("Children Education, 3-6 years old",
new Author("Ben Jermain", 34)));
library.addBook(new Book("Children Education, 6-12 years old",
new Author("Ben Jermain", 34)));
library.addBook(new Book("Baby Names Book", new Author("Quan Jia", 56)));
library.addBook(new Book("Java Development", new Author("Van Jondon",
43)));
需求：将Library中所有的Book显示在Table中，Table有两列，第一列显示Book名称，第二列显示Author名称。
1. 常规用法
创建TableViewer
final TableViewer viewer = new TableViewer(shell, SWT.MULTI
| SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER | SWT.FULL_SELECTION);
Table table = viewer.getTable();
// make lines and columns visible
table.setLinesVisible(true);
table.setHeaderVisible(true);
创建TableViewerColumn
TableViewerColumn nameColumn = new TableViewerColumn(viewer, SWT.NONE);
nameColumn.getColumn().setText("Name");
nameColumn.getColumn().setWidth(200);
TableViewerColumn authorColumn = new TableViewerColumn(viewer, SWT.NONE);
authorColumn.getColumn().setText("Author");
authorColumn.getColumn().setWidth(100);
设置Content Provider
viewer.setContentProvider(new BookContentProvider());
Class BookContentProvider
class BookContentProvider implements
IStructuredContentProvider {
public void dispose() {
}
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
}
public Object[] getElements(Object inputElement) {
if (inputElement instanceof Library) {
return ((Library) inputElement).getBooks().toArray();
}
return new Object[0];
}
}
设置Label Provider
viewer.setLabelProvider(new BookLabelProvider());
Class BookLabelProvider
class BookLabelProvider extends LabelProvider implements
ITableLabelProvider {
public Image getColumnImage(Object element, int columnIndex) {
return null;
}
public String getColumnText(Object element, int columnIndex) {
if (element instanceof Book) {
if (columnIndex == 0) {
return ((Book) element).getName();
} else if (columnIndex == 1) {
Author author = ((Book) element).getAuthor();
if (author != null) {
return author.getName();
}
}
}
return null;
}
}
设置input
viewer.setInput(library);
运行之后如图：
2. 高级用法
通过CellLabelProvider来设置Label Provider
nameColumn.setLabelProvider(new ColumnLabelProvider() {
public String getText(Object element) {
if (element instanceof Book) {
return ((Book) element).getName();
}
return super.getText(element);
}
public Color getForeground(Object element) {
return display.getSystemColor(SWT.COLOR_BLUE);
}
});
authorColumn.setLabelProvider(new ColumnLabelProvider() {
public String getText(Object element) {
if (element instanceof Book) {
Author author = ((Book) element).getAuthor();
if (author != null) {
return author.getName() + "(" + author.getAge() + ")";
}
}
return super.getText(element);
}
public Color getBackground(Object element) {
return display.getSystemColor(SWT.COLOR_CYAN);
}
});
设置CellEditor方法一
private static final String[] COLUMN_PROPERYIES = { "NAME", "AUTHOR" };
viewer.setColumnProperties(COLUMN_PROPERYIES);
viewer.setCellEditors(new CellEditor[] {
new TextCellEditor(viewer.getTable()), null });
viewer.setCellModifier(new ICellModifier() {
public void modify(Object element, String property, Object value) {
if (COLUMN_PROPERYIES[0].equals(property)) {
if (element instanceof TableItem) {
element = ((TableItem) element).getData();
}
if (element instanceof Book) {
((Book) element).setName(value.toString());
}
}
viewer.update(element, new String[] { property });
}
public Object getValue(Object element, String property) {
if (COLUMN_PROPERYIES[0].equals(property)) {
if (element instanceof Book) {
return ((Book) element).getName();
}
}
return null;
}
public boolean canModify(Object element, String property) {
return COLUMN_PROPERYIES[0].equals(property);
}
});
设置CellEditor方法二
authorColumn.setEditingSupport(new EditingSupport(viewer) {
protected void setValue(Object element, Object value) {
if (element instanceof Book) {
Author author = ((Book) element).getAuthor();
if (author != null) {
author.setName(value.toString());
}
}
viewer.update(element, null);
}
protected Object getValue(Object element) {
if (element instanceof Book) {
Author author = ((Book) element).getAuthor();
return author.getName();
}
return null;
}
protected CellEditor getCellEditor(Object element) {
return new DialogCellEditor(viewer.getTable()) {
protected Object openDialogBox(Control cellEditorWindow) {
InputDialog dialog = new InputDialog(cellEditorWindow
.getShell(), "Author Name",
"Change the name of Author",
(String) getValue(), null);
dialog.open();
return dialog.getValue();
}
};
}
protected boolean canEdit(Object element) {
return true;
}
});
通过给每一个TableViewerColumn来设置CellLabelProvider完成对这一列所有内容的定制。
除了常用的ColumnLableProvider，还有OwnerDrawLabelProvider用来自定义绘制表格。
设置过滤器（Filter）
viewer.addFilter(new ViewerFilter() {
public boolean select(Viewer viewer, Object parentElement,
Object element) {
if (element instanceof Book) {
Author author = ((Book) element).getAuthor();
if (author != null && author.getAge() < 40) {
return false;
}
}
return true;
}
});
ViewerFilter.select()方法返回true，则显示，否则被过滤掉不显示。
设置排序器（Sorter）
viewer.getTable().setSortColumn(nameColumn.getColumn());
nameColumn.getColumn().addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
viewer.setComparator(new ViewerComparator() {
public int compare(Viewer viewer, Object e1, Object e2) {
String n1 = ((Book) e1).getName();
String n2 = ((Book) e2).getName();
int value = Collator.getInstance().compare(n1, n2);
int sort = ((TableViewer) viewer).getTable()
.getSortDirection();
if ((sort & SWT.DOWN) != 0) {
return -value;
} else if ((sort & SWT.UP) != 0) {
return value;
}
return 0;
}
});
int sort = viewer.getTable().getSortDirection();
viewer.getTable().setSortDirection(
(SWT.UP & sort) != 0 ? SWT.DOWN : SWT.UP);
}
});
排序功能主要通过Viewer.setComparator()方法来实现。
参考资料：
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