Question

我正在创建一个下拉列表，该列表应该具有表中特定行的CREATE，DELETE，SUBMIT。有人可以帮我解决如何在GWT中创建一个。

   table.addCellPreviewHandler(new Handler<RequestDto>()
    {

        @Override
        public void onCellPreview(CellPreviewEvent<RequestDto> event)
        {
            if (event.getNativeEvent().getButton() == NativeEvent.BUTTON_RIGHT)
            {


                MenuBar options = new MenuBar();
                MenuBar gwtPop = new MenuBar();
                options.addItem("Create", gwtPop);
                options.addItem("Submit", gwtPop);
                MenuItem Import = new MenuItem(new SafeHtmlBuilder().appendEscaped("Import").toSafeHtml());
                Import.setScheduledCommand(new ScheduledCommand()
                {

                    @Override
                    public void execute()
                    {
                        Window.alert("hello");
                    }
                });
            final DialogBox menuWrapper = new DialogBox(true);
                menuWrapper.add(options);
                gwtPop.addItem(Import);

Answer 1

首先，不要在onCellPreview方法中构建菜单。每次点击都不需要反复构建相同的小部件。

您可以这样做：

int clickedRow = -1;
...
// build your menu here
// use clickedRow where necessary, for example:

deleteMenuItem.setScheduledCommand(new ScheduledCommand() {

    @Override
    public void execute() {
        Window.alert("hello, I am about to delete row " + clickedRow);
    }
});
...
myTable.addCellPreviewHandler(new Handler<MyObject>() {

    @Override
    public void onCellPreview(CellPreviewEvent<MyObject> event) {
        if (event.getNativeEvent().getButton() == NativeEvent.BUTTON_RIGHT) {
            event.getNativeEvent().stopPropagation();
            clickedRow = event.getIndex();
            // show your menu - no need to construct it again 
    }
}

如何在GWT中右键单击创建下拉列表

1 个答案: