是否可以处理 Windows Phone Toolkit HubTile 的 Visual State Changed 事件? [英] Is it possible to handle the Visual State Changed event for the Windows Phone Toolkit HubTile?
问题描述
当视觉状态更改为翻转时,我想更改 HubTile 的源(图像),但是我似乎无法让 VisualStateManager.GetVisualStateGroups 从 Windows Phone 工具包中为 HubTile 控件工作.
I would like to change the Source (Image) of a HubTile when the Visual State changes to Flipped however I don't seem to be able to get the VisualStateManager.GetVisualStateGroups working for the HubTile control from the Windows Phone Toolkit.
我认为一旦我有了 VisualStateGroup,我就可以处理 CurrentStateChanged 事件,但是我似乎无法获得该组.
I presume that once I have the VisualStateGroup I can then handle the CurrentStateChanged event however I don't seem to be able to get the group.
我看到了以下线程,不幸的是它没有包含代码片段:-
I have seen the following thread which unfortunately doesn't include a code snippet :-
我也尝试过使用 VisualTreeHelper.GetChild,我认为这不是必需的.
I have also tried to use the VisualTreeHelper.GetChild, which I don't think is required.
如果您能分享一些想法,我将不胜感激?
I would be very grateful if you could share some ideas?
推荐答案
基于以下博文 :-
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;
}
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