Question

我试图从我自己的Utility类引用一个MToolItem，这样我就可以通过编程方式设置它的选择状态。问题是我似乎总是回到null。我知道我有正确的id，类似的代码在处理程序类中工作（通过在execute方法中传入EModelService和MApplication）。当我进行find（）调用时，EModelService或MApplication是否可能过时？有更好的方法吗？

public class MyUtilityClass {
    @Inject
    private EModelService modelService;
    @Inject
    private MApplication app;

    private void toggle(final boolean selected) {
        MToolItem toolItem = (MToolItem) modelService.find("my.tool.id", app);
        // toolItem is always null
        if (toolItem != null) {
            toolItem.setSelected(selected);
        }

        // I have also tried to find it via way below but it also doesn't work
        final List<MToolItem> toolItems = modelService.findElements(
            app, "my.tool.id", MToolItem.class,
            new ArrayList<String>(), EModelService.ANYWHERE);
    }
}

Answer 1

假设注入的对象不为null，我会写这样的东西：

private void toggle(final boolean selected) {

        MWindow window = (MWindow) app.getChildren().get(0);

        List<MToolItem> toolItems = modelService.findElements(window, "my.tool.id", 
                MToolItem.class, 
                null, 
                EModelService.OUTSIDE_PERSPECTIVE
                | EModelService.IN_ANY_PERSPECTIVE
                | EModelService.IN_SHARED_AREA);

        if(toolItems.isEmpty()){
            return; // no item found
        }

        // exec your code
        toolItems.get(0).setSelected(selected);
}

找到一个MToolItem

1 个答案: