ListViewItem样式无法触发未选中

时间:2017-04-18 00:46:47

标签: c# uwp win-universal-app

ListViewItem样式无法触发Unselected但可以触发Selected。

我希望看到someThing在选择listView项目时显示,并在未选中时隐藏。

但是我可以看到它已经显示出来了,但却看不到它被隐藏了。

我从https://msdn.microsoft.com/en-us/library/windows/apps/mt299136.aspx

复制样式

我确定我将SelectionMode设置为Single。

我复制的代码是

  <Style x:Key="ListViewItemStyle" TargetType="ListViewItem">
            <Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}"/>
            <Setter Property="FontSize" Value="{ThemeResource ControlContentThemeFontSize}"/>
            <Setter Property="Background" Value="{ThemeResource ListViewItemBackground}"/>
            <Setter Property="Foreground" Value="{ThemeResource ListViewItemForeground}"/>
            <Setter Property="TabNavigation" Value="Local"/>
            <Setter Property="IsHoldingEnabled" Value="True"/>
            <Setter Property="Padding" Value="12,0,12,0"/>
            <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
            <Setter Property="VerticalContentAlignment" Value="Center"/>
            <Setter Property="MinWidth" Value="{ThemeResource ListViewItemMinWidth}"/>
            <Setter Property="MinHeight" Value="{ThemeResource ListViewItemMinHeight}"/>
            <Setter Property="AllowDrop" Value="False"/>
            <Setter Property="UseSystemFocusVisuals" Value="True"/>
            <Setter Property="FocusVisualMargin" Value="0"/>
            <Setter Property="FocusVisualPrimaryBrush" Value="{ThemeResource ListViewItemFocusVisualPrimaryBrush}"/>
            <Setter Property="FocusVisualPrimaryThickness" Value="2"/>
            <Setter Property="FocusVisualSecondaryBrush" Value="{ThemeResource ListViewItemFocusVisualSecondaryBrush}"/>
            <Setter Property="FocusVisualSecondaryThickness" Value="1"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="ListViewItem">
                        <Grid>
                            <ContentPresenter ></ContentPresenter>
                            <Button x:Name="b" Opacity="0"></Button>
                            <VisualStateManager.VisualStateGroups>
                                <VisualStateGroup x:Name="SelectionStates">
                                    <VisualState x:Name="Unselecting">
                                        <Storyboard BeginTime="0:0:0">
                                            <DoubleAnimation Storyboard.TargetName="b"
                                                     Storyboard.TargetProperty="Opacity"
                                                     Duration="0:0:0.1"
                                                     To="0" />
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Unselected">
                                        <Storyboard BeginTime="0:0:0">
                                            <DoubleAnimation Storyboard.TargetName="b"
                                                     Storyboard.TargetProperty="Opacity"
                                                     Duration="0"
                                                     To="0" />
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Selected">
                                        <Storyboard BeginTime="0:0:0">
                                            <DoubleAnimation Storyboard.TargetName="b"
                                                     Storyboard.TargetProperty="Opacity"
                                                     Duration="0"
                                                     To="1" />
                                        </Storyboard>
                                    </VisualState>
                                </VisualStateGroup>
                            </VisualStateManager.VisualStateGroups>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>

            </Setter>

        </Style>

我已经看到了这个答案https://stackoverflow.com/a/36010296/6116637,Archana提供了一种使用CustomUnselected的方法,并在SelectionChanged时更改它。

这是一个很好的方法,但我不想将相同的代码编写到很多地方因为我有很多ListView应该这样做。有没有什么好的方法只能写xaml?

我已经看到了答案,即绑定到IsSelected但是当我想要TemplateBinding的可见性时,TemplateBinding无法使用转换。

当我使用Visibility="{Binding Path={TemplateBinding IsSelected},Converter={StaticResource BooleanVisibility},Mode=OneWay}"Visibility="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsSelected,Converter={StaticResource BooleanInverseVisibility},Mode=OneWay}"时,结果不是我想要的。

请参阅:https://stackoverflow.com/a/40328520/6116637

1 个答案:

答案 0 :(得分:1)

创建逆可见性转换器:

public class BooleanInverseVisibilityConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language)
    {
        return (bool)value ? Visibility.Collapsed : Visibility.Visible;
    }

    public object ConvertBack(object value, Type targetType, object parameter, string language)
    {
        return (Visibility)value != Visibility.Visible;
    }
}

如果它是真的就会崩溃并显示它的错误。

Visibility="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsSelected,Converter={StaticResource BooleanInverseVisibility},Mode=OneWay}"