是否有可能处理为Windows Phone工具包HubTile可视状态改变的事件?(Is it po

2019-10-18 20:08发布

我想改变HubTile溯源(图像)时,翻转可视化状态的变化,但是我似乎并没有能够得到从Windows手机工具箱的HubTile控制工作VisualStateManager.GetVisualStateGroups。

我相信,一旦我有VisualStateGroup然后我可以处理CurrentStateChanged事件,但是我似乎没有能够拿到小组第一。

我已经看到了以下螺纹不幸的是不包括代码片段: -

改变图像源时Hubtile“复位”

我也曾尝试使用VisualTreeHelper.GetChild,我并不需要考虑。

我会很感激,如果你能分享一些想法?

Answer 1:

主要基于以下博客文章: -

http://blogs.msdn.com/b/ptorr/archive/2010/07/23/how-to-detect-when-a-list-is-scrolling-or-not.aspx

我想出了以下内容: -

    bool alreadyHookedEvents = false;

    List<string> _images = new List<string>();
    int _index = 0;

    void MainPage_Loaded(object sender, RoutedEventArgs e)
    {
        if (_images.Count == 0)
        {
            _images.Add(@"\Images\1.jpg");
            _images.Add(@"\Images\2.jpg");
            _images.Add(@"\Images\3.jpg");
            _images.Add(@"\Images\4.jpg");
            _images.Add(@"\Images\5.jpg");
            _images.Add(@"\Images\6.jpg");
            _images.Add(@"\Images\7.jpg");
            _images.Add(@"\Images\8.jpg");
            _images.Add(@"\Images\9.jpg");
            _images.Add(@"\Images\10.jpg");
            _images.Add(@"\Images\11.jpg");
            _images.Add(@"\Images\12.jpg");
        }

        if (alreadyHookedEvents)
            return;

        alreadyHookedEvents = true;
        // Visual States are always on the first child of the control template
        FrameworkElement element = VisualTreeHelper.GetChild(this.MyHubTile, 0) as FrameworkElement;
        if (element != null)
        {
            VisualStateGroup group = FindVisualState(element, "ImageStates");
            if (group != null)
            {
                group.CurrentStateChanged += (s, args) => 
                {
                    if (group.CurrentState.Name == "Flipped")
                    {
                        _index++;
                        this.MyHubTile.Source = new BitmapImage(new Uri(_images[_index], UriKind.Relative));
                    }
                };
            }
        }
    }

    VisualStateGroup FindVisualState(FrameworkElement element, string name)
    {
        if (element == null)
            return null;

        IList groups = VisualStateManager.GetVisualStateGroups(element);
        foreach (VisualStateGroup group in groups)
            if (group.Name == name)
                return group;

        return null;
    }

    T FindSimpleVisualChild<T>(DependencyObject element) where T : class
    {
        while (element != null)
        {

            if (element is T)
                return element as T;

            element = VisualTreeHelper.GetChild(element, 0);
        }

        return null;
    }


文章来源: Is it possible to handle the Visual State Changed event for the Windows Phone Toolkit HubTile?