1

我使用 NatTable。如何根据单元格的内容在特定条件下显示上下文菜单项？以及如何选择调用上下文菜单的单元格？我用以下代码绑定菜单

uiBindingRegistry.registerMouseDownBinding(
            new MouseEventMatcher(SWT.NONE, null, MouseEventMatcher.RIGHT_BUTTON), new PopupMenuAction(menu));

UPD： 我创建这样的菜单，但是尽管isActive总是 return ，但“测试”项目仍然可见false。它出什么问题了？

menu = new PopupMenuBuilder(natTable).withMenuItemProvider(ITEM_ID, new IMenuItemProvider() {
        @Override
        public void addMenuItem(final NatTable natTable, final Menu popupMenu) {
            final MenuItem menuItem = new MenuItem(popupMenu, SWT.PUSH);
            menuItem.setText("Test");
            menuItem.setEnabled(true);
            menuItem.addSelectionListener(new SelectionAdapter() {
                @Override
                public void widgetSelected(final SelectionEvent event) {
                    System.out.println("test");
                }
            });
        }
    }).withVisibleState(ITEM_ID, new IMenuItemState() {
        @Override
        public boolean isActive(final NatEventData natEventData) {
            return false;
        }
    }).build();
4

3 回答 3

2

给出的答案是正确的。虽然可以改进。您不需要 SelectionLayer。

class CellPopupMenuAction implements IMouseAction {

    private final Menu menu;

    public CellPopupMenuAction(Menu menu) {
        this.menu = menu;
    }

    @Override
    public void run(NatTable natTable, MouseEvent event) {
        int columnPosition = natTable.getColumnPositionByX(event.x);
        int rowPosition = natTable.getRowPositionByY(event.y);

        ILayerCell cell = natTable.getCellByPosition(columnPosition, rowPosition);

        if (!cell.getDisplayMode().equals(DisplayMode.SELECT)) {
            natTable.doCommand(
                    new SelectCellCommand(
                            natTable,
                            columnPosition,
                            rowPosition,
                            false,
                            false));
        }

        menu.setData(MenuItemProviders.NAT_EVENT_DATA_KEY, event.data);
        menu.setVisible(true);
    }
}

通过这种方式，您完全无需引用 SelectionLayer，甚至可以改进功能，因为如果您右键单击选定的单元格，则永远不会触发 SelectCellCommand。

于 2016-01-13T07:52:59.147 回答
1

您需要 IMouseAction 来选择单元格。此处的示例代码以及在其中添加的一些附加代码以选择在下面添加的调用：

nattable.addConfiguration( new AbstractUiBindingConfiguration()

    uiBindingRegistry.registerMouseDownBinding( new MouseEventMatcher( SWT.NONE, GridRegion.BODY,
                            MouseEventMatcher.RIGHT_BUTTON ), new CellPopupMenuAction(menu, selectionLayer) );


});

class CellPopupMenuAction implements IMouseAction {

                private final Menu menu;
                private final SelectionLayer selectionLayer;

                public CellPopupMenuAction(Menu menu, SelectionLayer selectionLayer) {
                    this.menu = menu;
                    this.selectionLayer = selectionLayer;
                }

                @Override
                public void run(NatTable natTable, MouseEvent event) 
                {
                    if( selectionLayer.getSelectedRowCount() <= 1 )
                            {
                                int colPosition = LayerUtil.convertColumnPosition( natTable,
                                        natTable.getColumnPositionByX( event.x ), selectionLayer );
                                int rowPosition = LayerUtil.convertRowPosition( natTable,
                                        natTable.getRowPositionByY( event.y ), selectionLayer );

                                natTable.doCommand( new SelectCellCommand( selectionLayer, colPosition, rowPosition, false,
                                        false ) );
                            }
                    menu.setData(event.data);
                    menu.setVisible(true);
                }
            }

我假设您将 selectionLayer 作为代码中的私有变量。

于 2016-01-13T00:55:01.827 回答
0

我在上面使用了 SomeDude 的答案，它有效，但菜单项在选择之前显示，看起来很奇怪。我将菜单显示移动到 UI 线程 asyncExec 调用并首先发生选择，然后菜单出现在其顶部 -

@Override
public void run(NatTable natTable, MouseEvent event) {

    if (selectionLayer.getSelectedRowCount() <= 1) {

        int colPosition = LayerUtil.convertColumnPosition(natTable, natTable.getColumnPositionByX(event.x),
                selectionLayer);

        int rowPosition = LayerUtil.convertRowPosition(natTable, natTable.getRowPositionByY(event.y),
                selectionLayer);

        natTable.doCommand(new SelectCellCommand(selectionLayer, colPosition, rowPosition, false, false));

    }

    Display.getDefault().asyncExec(new Runnable() {
        public void run() {
            menu.setData(event.data);
            menu.setVisible(true);
        }
    });

}
于 2018-04-29T16:46:37.617 回答