Question

在我的TabControl OnSelectionChanged活动中，我从之前选择的标签页中删除了装饰，并在新选择的标签页中添加了装饰。

private void tabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        var tabControl = (TabControl)sender;
        var previousTabItem = (TabItem)e.RemovedItems[0];
        var newTabItem = (TabItem)e.AddedItems[0];

        RemoveTabItemsControlsAdorners(tabControl, previousTabItem);

        var tabControlChildrenSelected = TabControlHelper.GetTabControlAnalysisElements(UIHelper.FindVisualChildrenOfMultipleTypes(UIHelper.AnalysisControlTypes, tabControl.FindChildContentPresenter(newTabItem)));
        var details = (InputControlEventDetails)(tabControl).Tag;

        tabControlChildrenSelected = tabControlChildrenSelected.Concat(new[] { newTabItem });

        AddAdorners(tabControlChildrenSelected, details.InputControlEvents, details.NumberOfLoggedViews);
    }

这一行给了我新选择的TabItem的元素（它不是空的）：

 var tabControlChildrenSelected = TabControlHelper.GetTabControlAnalysisElements(UIHelper.FindVisualChildrenOfMultipleTypes(UIHelper.AnalysisControlTypes, tabControl.FindChildContentPresenter(newTabItem)));

在我的TabControlHelper中，我对可见元素进行了过滤。但是新选择的TabItem的所有元素都还不可见。所以GetTabControlAnalysisElements()返回一个空集合。所以我尝试通过反射检查可见性，但methodInfo始终为空。

public static IEnumerable<FrameworkElement> GetTabControlAnalysisElements(IEnumerable<FrameworkElement> elements)
    {
        var visibleElements = elements.Where(element => WouldBeVisible(element));
        return visibleElements;
    }

    public static bool WouldBeVisible(FrameworkElement element)
    {
        // Returns true if the control would be visible if container is visible
        var methodInfo = element.GetType().GetMethod("GetState", BindingFlags.Instance | BindingFlags.NonPublic);
        if (methodInfo == null) return element.IsVisible;
        return (bool)(methodInfo.Invoke(element, new object[] { 2 }));
    }

如何获取新选择的TabItem的可见项？

获取新选定TabItem的可见控件

0 个答案: