windows-8 – 在Windows应用商店应用程序后面的代码中转到Grid内

首先创建一个帮助程序类,就像我们以前在Silverlight或Windows Phone中使用它一样(我从here获取了这段代码并对其进行了一些修改,因此当一个元素没有附加任何可视状态组时,它会自动进行搜索其父级,直到找到任何).

public class ExtendedVisualStateManager : VisualStateManager
{
    protected override bool GoToStateCore(Control control,FrameworkElement stateGroupsRoot,string stateName,VisualStateGroup group,VisualState state,bool useTransitions)
    {
        if ((group == null) || (state == null))
        {
            return false;
        }

        if (control == null)
        {
            control = new ContentControl();
        }

        return base.GoToStateCore(control,stateGroupsRoot,stateName,group,state,useTransitions);
    }

    public static bool GoToElementState(FrameworkElement element,bool useTransitions)
    {
        var root = FindNearestStatefulFrameworkElement(element);

        var customVisualStateManager = VisualStateManager.GetCustomVisualStateManager(root) as ExtendedVisualStateManager;

        return ((customVisualStateManager != null) && customVisualStateManager.GoToStateInternal(root,useTransitions));
    }

    private static FrameworkElement FindNearestStatefulFrameworkElement(FrameworkElement element)
    {
        while (element != null && VisualStateManager.GetCustomVisualStateManager(element) == null)
        {
            element = element.Parent as FrameworkElement;
        }

        return element;
    }

    private bool GoToStateInternal(FrameworkElement stateGroupsRoot,bool useTransitions)
    {
        VisualStateGroup group;
        VisualState state;

        return (TryGetState(stateGroupsRoot,out group,out state) && this.GoToStateCore(null,useTransitions));
    }

    private static bool TryGetState(FrameworkElement element,out VisualStateGroup group,out VisualState state)
    {
        group = null;
        state = null;

        foreach (VisualStateGroup group2 in VisualStateManager.GetVisualStateGroups(element))
        {
            foreach (VisualState state2 in group2.States)
            {
                if (state2.Name == stateName)
                {
                    group = group2;
                    state = state2;
                    return true;
                }
            }
        }

        return false;
    }
}

然后你需要手动将xaml更新为这样的东西 –

<VisualStateManager.CustomVisualStateManager>
    <common:ExtendedVisualStateManager />
</VisualStateManager.CustomVisualStateManager>
<VisualStateManager.VisualStateGroups>
    <VisualStateGroup .../>
</VisualStateManager.VisualStateGroups>

我想这个解决方案的优点是你仍然可以在Blend的States选项卡中看到视觉状态,对于Blend爱好者来说这很酷.