Question

我试图在按钮点击时显示一个折叠的堆叠面板，但我遇到了问题所以我试图改变我的想法，我能够折叠一个可见的堆叠面板。但不幸的是，我无法实现我想要的行为，在按钮点击时显示折叠的堆栈面板。代码：D

XAML

<Button x:Name="sentButton" Content="Add Friend" Style="{DynamicResource FlatButtonStyle}" Margin="493,0,0,0" HorizontalAlignment="Left" Width="106"/>
    <StackPanel Style="{DynamicResource stackCollapsed}" Visibility="Collapsed">
        <Label Content="Invite Friends" FontWeight="Bold" Margin="0,0,477,0" Height="32" />
        <StackPanel Orientation="Horizontal" Margin="26,0,0,0">
            <Label Content="Enter your friend's email" Width="222" Height="25" />
            <TextBox Text="{Binding Email, UpdateSourceTrigger=PropertyChanged}" Style="{DynamicResource MyTextBox}" x:Name="textBoxEmail" Width="298"/>
            <Button x:Name="button1" Content="Send" Command="{Binding AddCommand}" Width="77" Style="{DynamicResource FlatButtonStyle}" Margin="20,0,0,0"/>
        </StackPanel>
    </StackPanel>

样式

<!-- Style Collapsed-->
<Style x:Key="stackCollapsed" TargetType="StackPanel">
    <Style.Triggers>
        <DataTrigger Binding="{Binding ElementName=sentButton,Path=IsPressed}" Value="true">
            <Setter Property="StackPanel.Visibility" Value="Visible"/>
        </DataTrigger>
    </Style.Triggers>
</Style>

Answer 1

而不是Button使用ToggleButton并通过StackPanel.Visibility转换器将ToggleButton.IsChecked绑定到BooleanToVisibilityConverter属性

<ToggleButton x:Name="sentButton" Content="Add Friend" Margin="493,0,0,0" HorizontalAlignment="Left" Width="106"/>
<StackPanel Visibility="{Binding ElementName=sentButton, Path=IsChecked, Converter={StaticResource BooleanToVisibilityConverter}}">
    <Label Content="Invite Friends" FontWeight="Bold" Margin="0,0,477,0" Height="32" />
    <StackPanel Orientation="Horizontal" Margin="26,0,0,0">
        <Label Content="Enter your friend's email" Width="222" Height="25" />
        <TextBox Text="{Binding Email, UpdateSourceTrigger=PropertyChanged}"  x:Name="textBoxEmail" Width="298"/>
        <Button x:Name="button1" Content="Send" Command="{Binding AddCommand}" Width="77" Margin="20,0,0,0"/>
    </StackPanel>
</StackPanel>

其中转换器定义如下

<Window.Resources>
    <ResourceDictionary>
        <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
    </ResourceDictionary>
</Window.Resources>

Answer 2

问题是Visibility选项卡中的<StackPanel>属性优先于样式或触发器中设置的任何内容，因此永远不会应用触发器。有关详细信息，请参阅Dependency Property Precedence List。

要修复当前的解决方案，请将Visibliity属性移出<StackPanel>标记并移入您的样式，如下所示：

<Style x:Key="stackCollapsed" TargetType="StackPanel">
    <Setter Property="Visibility" Value="Collapsed"/>
    <Style.Triggers>
        <DataTrigger Binding="{Binding ElementName=sentButton,Path=IsPressed}" Value="true">
            <Setter Property="Visibility" Value="Visible"/>
        </DataTrigger>
    </Style.Triggers>
</Style>

<StackPanel Style="{DynamicResource stackCollapsed}">
    ...
</StackPanel>

那就是说，我个人会推荐类似于切换按钮的内容，StackPanel.Visibility绑定到ToggleButton.IsChecked，例如this answer suggests。

Answer 3

我解决了将Children设置为null

stackPanel.Children.Clear();

如果您是第一次需要显示/隐藏面板，则可以使用此功能，如果需要运行时，则无法使用

Answer 4

就像Stackpanel一样简单。Visibility= Visibility.Collapsed。

StackPanel在按钮上折叠和可见

4 个答案: