- 按钮在点击 listviewitem 时出现,离开时消失
- 按下播放时,此按钮保持可见,内容更改为停止
我的问题是:
- 当我按下停止时,此按钮保持可见并且触发器消失:/
我还想做但我不能做的是:
- 当我按下播放时,滑块出现,否则折叠
我希望有人能帮助我。到目前为止,我的代码如下所示:
XAML:
<ListView Name="lst">
<ListView.View>
<GridView>
<GridViewColumn>
<GridViewColumn.CellTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Button Name="btnDownload" Content="Download" Visibility="Hidden" MinWidth="100"/>
<Button Name="btnPlay"
Click="btnPlay_Click"
Content="Play"
Visibility="Hidden"
MinWidth="100"/>
</StackPanel>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding
RelativeSource={RelativeSource
Mode=FindAncestor,
AncestorType={x:Type ListViewItem}},
Path=IsMouseOver}"
Value="True">
<Setter TargetName="btnDownload"
Property="Visibility"
Value="Visible"/>
<Setter TargetName="btnPlay"
Property="Visibility"
Value="Visible"/>
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn>
<GridViewColumn.Header>
<GridViewColumnHeader Tag="Name">Name</GridViewColumnHeader>
</GridViewColumn.Header>
<GridViewColumn.CellTemplate>
<DataTemplate>
<StackPanel MinWidth="200">
<TextBlock Text="{Binding Name}"/>
<Slider Name="Slider" Visibility="Visible"/>
</StackPanel>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
CS:
public partial class MainWindow : Window
{
public ListCollectionView MyCollectionView { get; set; }
public ObservableCollection<Songs> songs = new ObservableCollection<Songs>();
public MainWindow()
{
InitializeComponent();
MyCollectionView = new ListCollectionView(songs);
lst.ItemsSource = MyCollectionView;
songs.Add(new Songs(){Name = "Eminem - Superman"});
songs.Add(new Songs(){Name = "Rihanna - Please don't stop the music"});
songs.Add(new Songs(){Name = "Linkin Park - Numb"});
}
private void btnPlay_Click(object sender, RoutedEventArgs e)
{
//Reset all songs
List<Button> buttons = FindVisualChildren<Button>(lst).ToList();
foreach (Button button in buttons)
{
button.Content = "Play";
//Loosing Triggers
}
//Play current
Button btn = sender as Button;
btn.Visibility = Visibility.Visible;
btn.Content = "Stop";
}
private IEnumerable<T> FindVisualChildren<T>(DependencyObject obj) where T : DependencyObject
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
{
DependencyObject child = VisualTreeHelper.GetChild(obj, i);
if (child != null && child is T)
{
yield return (T)child;
}
else
{
var childOfChild = FindVisualChildren<T>(child);
if (childOfChild != null)
{
foreach (var subchild in childOfChild)
{
yield return subchild;
}
}
}
}
}
}
public class Songs : INotifyPropertyChanged
{
private string name;
public string Name
{
get { return name; }
set
{
if (name != value)
{
name = value;
NotifyPropertyChanged("Name");
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
public void NotifyPropertyChanged(string propName)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propName));
}
}
项目:
当然-对不起我的英语不好:)