Question

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： 我创建了这样的菜单，但是＆＃39;测试＆＃39;尽管isActive总是返回false，但该项仍然可见。它有什么问题？

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();

Answer 1

给出的答案是正确的。虽然可以改进。你不需要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);
    }
}

这样您就完全不需要引用SelectionLayer甚至改进功能，因为如果右键单击选定的单元格，SelectCellCommand永远不会被触发。

Answer 2

您需要IMouseAction来选择单元格。来自here的示例代码以及在其中添加的一些其他代码用于选择下面添加的调用：

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);
                }
            }

我假设您在代码中将selectionLayer作为私有变量。

Answer 3

我上面使用了SomeDude的答案并且它有效，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调用并首先进行选择，然后菜单出现在它上面 -

@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);
        }
    });

}

显示NatTable上下文菜单

3 个答案: