在GWT CellList中需要多选

Question

我想在一个CellList组件中选择多个单元格；我是GWT新手，有人可以帮我吗？为了获得多选，我如何修改下面的代码？

public class HelloWorld implements EntryPoint {
private static final List<String> DAYS = Arrays.asList("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday",
        "Friday", "Saturday");

public void onModuleLoad() {
    // Create a cell to render each value.
    TextCell textCell = new TextCell();

    // Create a CellList that uses the cell.
    CellList<String> cellList = new CellList<String>(textCell);
    cellList.setKeyboardSelectionPolicy(KeyboardSelectionPolicy.ENABLED);

    // Add a selection model to handle user selection.
    final SingleSelectionModel<String> selectionModel = new SingleSelectionModel<String>();
    cellList.setSelectionModel(selectionModel);
    selectionModel.addSelectionChangeHandler(new SelectionChangeEvent.Handler() {
        public void onSelectionChange(SelectionChangeEvent event) {
            String selected = selectionModel.getSelectedObject();
            if (selected != null) {
                // Window.alert("You selected: " + selected);
            }
        }
    });

    cellList.setRowCount(DAYS.size(), true);

    // Push the data into the widget.
    cellList.setRowData(0, DAYS);

    // Add it to the root panel.
    RootPanel.get("gwtCellListBox").add(cellList);
}
}

Answer 1

首先，您需要一个MultiSelectionModel。然后，如果您希望按住Ctrl键，请使用DefaultSelectionEventManager作为CellPreviewEvent.Handler，该EventTranslator具有始终返回TOGGLE和false的自定义EventTranslator。

Answer 2

尝尝这个

public class HelloWorld implements EntryPoint {
private static final List<String> DAYS = Arrays.asList("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday",
        "Friday", "Saturday");

public void onModuleLoad() {
    // Create a cell to render each value.
    TextCell textCell = new TextCell();

    // Create a CellList that uses the cell.
    CellList<String> cellList = new CellList<String>(textCell);
    cellList.setKeyboardSelectionPolicy(KeyboardSelectionPolicy.ENABLED);

    // Add a selection model to handle user selection.
     final MultiSelectionModel<String> selectionModel = new MultiSelectionModel<String>();
     cellList.setSelectionModel(selectionModel);
     selectionModel.addSelectionChangeHandler(new SelectionChangeEvent.Handler() {
     public void onSelectionChange(SelectionChangeEvent event) {

        Set<String> selectedItems = selectionModel.getSelectedSet();

        for (String s : selectedItems) {
            System.out.println(s);
            Window.alert("You selected: " + s);
        }
    }
});

    cellList.setRowCount(DAYS.size(), true);

    // Push the data into the widget.
    cellList.setRowData(0, DAYS);

    // Add it to the root panel.
    RootPanel.get("gwtCellListBox").add(cellList);
}
}