C# 4.0 如何知道在windows 10中的通用windows应用程序中哪个元素处于焦点
我在Windows10的通用windows应用程序中有一个xaml页面。此页面包含两个列表框。两个列表框具有相同的项源，如C# 4.0 如何知道在windows 10中的通用windows应用程序中哪个元素处于焦点,c#-4.0,uwp,windows-10-universal,C# 4.0,Uwp,Windows 10 Universal,我在Windows10的通用windows应用程序中有一个xaml页面。此页面包含两个列表框。两个列表框具有相同的项源，如 public class CategoryModel { public int CategoryId {get; set;} public string CategoryName {get; set;} public List<string> ImageURL {get; set;} } 公共类类别模型 { public int CategoryId{g
public class CategoryModel
{
public int CategoryId {get; set;}
public string CategoryName {get; set;}
public List<string> ImageURL {get; set;}
}
公共类类别模型
{
public int CategoryId{get；set；}
公共字符串CategoryName{get；set；}
公共列表ImageURL{get；set；}
}
<ListView x:Name="lvMenuBar" Grid.Column="1" FlowDirection="LeftToRight" ItemsSource="{Binding MenuCategories}" Width="Auto">
<ListView.ItemTemplate>
<DataTemplate>
<Button Click="MenuBarClick" HorizontalAlignment="Center" VerticalAlignment="Top" Tag="{Binding CategoryId}" Content="{Binding CategoryName}" Style="{StaticResource CustomButtonStyle}" FontFamily="Segoe UI" FontWeight="SemiBold" FontSize="18" Margin="0" Padding="20" BorderBrush="Red" BorderThickness="0" Opacity="0.5" Foreground="Black"/>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</ListView.ItemsPanel>
</ListView>
<ListView x:Name="lvMenuBar" Grid.Column="1" FlowDirection="LeftToRight" ItemsSource="{Binding MenuCategories}" Width="Auto">
<ListView.ItemTemplate>
<DataTemplate>
以上是我的XAML如果我正确理解了问题，那么您希望在顶部列表中选择（或突出显示）底部列表中的项目。您可以通过数据绑定来实现这一点，例如：
<ListView
Grid.Row="0"
ItemsSource="{Binding MenuCategories}"
Margin="8"
SelectedIndex="{Binding SelectedIndex, ElementName=verticalList, Mode=OneWay}"
>
列表视图IsItemClickEnabled编辑：如果我理解正确，您希望上水平列表中的选择跟踪下垂直滚动，而不是选择。在这种情况下，您需要掌握内置的
ScrollViewer<Page.Resources>
<Style x:Key="CustomButtonStyle" TargetType="Button" />
</Page.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<ListView
Grid.Row="0"
ItemsSource="{Binding MenuCategories}"
Margin="8"
SelectedIndex="{Binding SelectedIndex, ElementName=verticalList, Mode=OneWay}"
>
<ListView.ItemTemplate>
<DataTemplate x:DataType="local:CategoryModel">
<Button
HorizontalAlignment="Center"
VerticalAlignment="Top"
Tag="{Binding CategoryId}"
Content="{Binding CategoryName}"
Style="{StaticResource CustomButtonStyle}"
FontFamily="Segoe UI"
FontWeight="SemiBold"
FontSize="18"
Margin="0"
Padding="20"
BorderBrush="Red"
BorderThickness="0"
Opacity="0.5"
Foreground="Black"/>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</ListView.ItemsPanel>
</ListView>
<ListView
x:Name="verticalList"
Grid.Row="1"
ItemsSource="{Binding MenuCategories}"
Margin="8"
IsItemClickEnabled="True"
SelectionMode="Single">
<ListView.ItemTemplate>
<DataTemplate x:DataType="local:CategoryModel">
<Button
HorizontalAlignment="Center"
VerticalAlignment="Top"
Tag="{Binding CategoryId}"
Content="{Binding CategoryName}"
Style="{StaticResource CustomButtonStyle}"
FontFamily="Segoe UI"
FontWeight="SemiBold"
FontSize="18"
Margin="0"
Padding="20"
BorderBrush="Red"
BorderThickness="0"
Opacity="0.5"
Foreground="Black"/>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel Orientation="Vertical" />
</ItemsPanelTemplate>
</ListView.ItemsPanel>
</ListView>
</Grid>
public MainPage()
{
InitializeComponent();
DataContext = this;
Loaded += (sender, args) =>
{
ScrollViewer scrollViewer = FindVisualChild<ScrollViewer>(verticalList);
if (scrollViewer != null)
{
scrollViewer.ViewChanged += (o, eventArgs) =>
{
int length = MenuCategories.Length;
double offset = scrollViewer.VerticalOffset;
double height = scrollViewer.ExtentHeight;
int index = (int)(length * offset / height);
horizontalList.SelectedIndex = index;
};
}
};
}
private static T FindVisualChild<T>(DependencyObject parent)
where T : DependencyObject
{
if (parent != null)
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
{
DependencyObject child = VisualTreeHelper.GetChild(parent, i);
T candidate = child as T;
if (candidate != null)
{
return candidate;
}
T childOfChild = FindVisualChild<T>(child);
if (childOfChild != null)
{
return childOfChild;
}
}
}
return default(T);
}
public主页（）
{
初始化组件（）；
DataContext=this；
已加载+=（发送方，参数）=>
{
ScrollViewer ScrollViewer=FindVisualChild（verticalList）；
如果（scrollViewer！=null）
{
scrollViewer.ViewChanged+=（o，eventArgs）=>
{
int length=MenuCategories.length；
双偏移=scrollViewer.VerticalOffset；
双倍高度=scrollViewer.ExtentHeight；
int索引=（int）（长度*偏移/高度）；
horizontalList.SelectedIndex=索引；
};
}
};
}
私有静态T FindVisualChild（DependencyObject父对象）
其中T:DependencyObject
{
如果（父项！=null）
{
for（int i=0；i您可能需要在这里进行计算实验；这对我来说有点实验性。这段代码解决了我的大部分问题
private double _scrollExtentHeight;
private ScrollViewer _scrollViewer;
_scrollViewer = FindVisualChild<ScrollViewer>(lvMenuItems);
if (_scrollViewer != null)
{
_scrollViewer.ManipulationMode = ManipulationModes.TranslateY;
_scrollViewer.DirectManipulationCompleted += scrollViewerDirectManipulationCompleted;
_scrollExtentHeight = _scrollViewer.ExtentHeight;
}
private static T FindVisualChild<T>(DependencyObject parent)
where T : DependencyObject
{
if (parent != null)
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
{
DependencyObject child = VisualTreeHelper.GetChild(parent, i);
T candidate = child as T;
if (candidate != null)
{
return candidate;
}
T childOfChild = FindVisualChild<T>(child);
if (childOfChild != null)
{
return childOfChild;
}
}
}
return default(T);
}
private void scrollViewerDirectManipulationCompleted(object sender, object e)
{
_menuVM.StartDispatcher();
if (_scrollViewer != null)
{
int length = _menuVM.Categories.Count;
double offset = _scrollViewer.VerticalOffset;
//Horizontal scroll viewer
List<Button> menuItems = GetAllMenuItemControl(lvMenuBar);
int currIndex = 0, index = 0;
//Categories height ratio contains the height ratio of each element for total height
for (; index < _menuVM.CategoriesHeightRatio.Count; index++)
{
if ((_menuVM.CategoriesHeightRatio[index - 1 > 0 ? index - 1 : 0] * _scrollExtentHeight) < offset && (_menuVM.CategoriesHeightRatio[index] * _scrollExtentHeight) >= offset)
{
currIndex = index;
}
else
{
menuItems[index].BorderThickness = new Thickness(0, 0, 0, 0);
menuItems[index].Opacity = 0.5;
}
}
menuItems[currIndex].BorderThickness = new Thickness(0, 0, 0, 2);
menuItems[currIndex].Opacity = 1;
var transform = lvMenuBar.TransformToVisual(menuItems[currIndex]);
Point absolutePoint = transform.TransformPoint(new Point(0, 0));
svMenuBar.ChangeView(Math.Abs(absolutePoint.X), null, null, false);
}
}
private List<Button> GetAllMenuItemControl(DependencyObject parent)
{
var _List = new List<Button>();
for (int index = 0; index < VisualTreeHelper.GetChildrenCount(parent); index++)
{
var _Child = VisualTreeHelper.GetChild(parent, index);
if (_Child is Button)
_List.Add(_Child as Button);
_List.AddRange(GetAllMenuItemControl(_Child));
}
return _List;
}
private-double\u-scroll扩展权限；
私有ScrollViewer\u ScrollViewer；
_scrollViewer=FindVisualChild（lvMenuItems）；
如果（_scrollViewer！=null）
{
_scrollViewer.操纵模式=操纵模式.TranslateY；
_scrollViewer.DirectOperationCompleted+=ScrollViewerDirectOperationCompleted；
_scrollExtentHeight=\u scrollViewer.ExtentHeight；
}
私有静态T FindVisualChild（DependencyObject父对象）
其中T:DependencyObject
{
如果（父项！=null）
{
for（int i=0；i0？index-1:0]*\u scrollExtentHeight）=offset）
{
currIndex=指数；
}
其他的
{
menuItems[index].BorderThickness=新厚度（0,0,0,0）；
menuItems[索引]。不透明度=0.5；
}
}
menuItems[currIndex]。边界厚度=新厚度（0,0,0,2）；