XAML Xamarin表单可折叠堆栈布局

soat7uwm 于 2022-12-07 发布在其他

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我正在尝试实现一种可折叠的StackLayout。每次用户点击按钮，它都会展开或折叠StackLayout以显示/隐藏更多的细节。

我能够实现或多或少与以下代码，但它看起来不正确，效果不是很好，因为它立即增长，我把效果应用到其他元素。
我正在使用xamarin表单，对此您有什么建议吗？

XAML格式

<?xml version="1.0" encoding="utf-8" ?>
<StackLayout xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="Sample.MyStackLayout" >

  <StackLayout x:Name="TopLayout">
    <StackLayout Orientation="Horizontal">
      <Label Text="some text" VerticalOptions="Center" HorizontalOptions="StartAndExpand"  />
      <Label Text="123" VerticalOptions="Center" HorizontalOptions="End" FontSize="Large" />
    </StackLayout>

    <BoxView Color="Black" HeightRequest="1" />

    <StackLayout Orientation="Horizontal">
      <Label Text="some text" VerticalOptions="Center" HorizontalOptions="StartAndExpand"  />
      <Label Text="123" VerticalOptions="Center" HorizontalOptions="End" FontSize="Large" />
    </StackLayout>

    <StackLayout Orientation="Horizontal">
      <Label Text="some text" VerticalOptions="Center" HorizontalOptions="StartAndExpand"  />
      <Label Text="123" VerticalOptions="Center" HorizontalOptions="End" FontSize="Large" />
    </StackLayout>

    <Button x:Name="btn" Text="Button" Clicked="btnClicked" />
  </StackLayout>

  <StackLayout x:Name="MoreDetails" IsVisible="False">
    <Label Text="some text 1"></Label>
    <Label Text="some text 2"></Label>
    <Label Text="some text 3"></Label>
    <Label Text="some text 4"></Label>
    <Label Text="some text 5"></Label>
    <Label Text="some text 6"></Label>
    <Label Text="some text 7"></Label>
    <Label Text="some text 8"></Label>
  </StackLayout>
</StackLayout>

代码

public AccountInfo()
{
    InitializeComponent();
}

bool isExpanded = false;
protected async void btnClicked(object sender, EventArgs e)
{
    if (isExpanded)
    {
        await MoreDetails.FadeTo(0);
        MoreDetails.IsVisible = !isExpanded;
    }
    else
    {
        MoreDetails.IsVisible = !isExpanded;
        await MoreDetails.FadeTo(1);
    }

    isExpanded = !isExpanded;
}

xaml

来源：https://stackoverflow.com/questions/39620775/xamarin-forms-collapsable-stacklayout

4条答案

按热度按时间

anhgbhbe1#

您可以创建一个自定义控件来执行此操作。如果使用Xaml创建“ExpandableView”内容视图，如下所示：

<ContentView xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="MyProject.CustomControls.ExpandableView">
    <StackLayout  x:Name="Layout" Orientation="Vertical" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
        <StackLayout x:Name="SummaryRegion"/>               
        <StackLayout x:Name="DetailsRegion" IsVisible="False"/>
    </StackLayout>
</ContentView>

并将.cs类连接起来，如下所示：

public partial class ExpandableView: ContentView
    {

        private TapGestureRecognizer _tapRecogniser;
        private StackLayout _summary;
        private StackLayout _details;

        public ExpandableView()
        {
            InitializeComponent();
            InitializeGuestureRecognizer();
            SubscribeToGuestureHandler();    
        }

        private void InitializeGuestureRecognizer()
        {
            _tapRecogniser= new TapGestureRecognizer();
            SummaryRegion.GestureRecognizers.Add(_tapRecogniser);
        }

        private void SubscribeToGuestureHandler()
        {
            _tapRecogniser.Tapped += TapRecogniser_Tapped;
        }

        public virtual StackLayout Summary
        {
            get { return _summary; }
            set
            {
                _summary = value;    
                SummaryRegion.Children.Add(_summary);
                OnPropertyChanged();
            }
        }

        public virtual StackLayout Details
        {
           get { return _details; }
           set 
           {
              _details = value;
              DetailsRegion.Children.Add(_details);
              OnPropertyChanged();
           }
       }

       private void TapRecogniser_Tapped(object sender, EventArgs e)
    {
        if (DetailsRegion.IsVisible)
        {
            DetailsRegion.IsVisible = false;
        }
        else
        {
             DetailsRegion.IsVisible = true;
        }
    }

并在XAML中定义它，如下所示：

<CustomControls:ExpandableView>
                            <CustomControls:ExpandableView.Summary>
                                   <StackLayout>
                                    YOUR STUFF HERE 
                                </StackLayout>
                            </CustomControls:ExpandableView.Summary>
                            <CustomControls:ExpandableView.Details>
                                <StackLayout>
                                    YOUR STUFF HERE 
                                </StackLayout>
                            </CustomControls:ExpandableView.Details>
                        </CustomControls:ExpandableView>

其中CustomControls是对ExpandableView所在的命名空间的引用。
您可以通过添加诸如展开时的动画、展开时突出显示“摘要区域”等内容来进一步展开此区域。

赞(0）回复(0）举报 2022-12-07

9rygscc12#

在APP类中，添加标志以启用实验功能：

Device.SetFlags(new string[] { "Expander_Experimental" });

然后，您可以这样使用它：

<Expander>
<Expander.Header>
    <StackLayout>
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="AUTO"/>
                <RowDefinition Height="AUTO"/>
                <RowDefinition Height="AUTO"/>
                <RowDefinition Height="AUTO"/>
            </Grid.RowDefinitions>

            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>

            <Label Grid.Row="0" Text="One label" />
            <Label Grid.Row="1" Text="One label" />
            <Label Grid.Row="2" Text="One label" />

            <Label Grid.Row="0" Grid.Column="1" Text="123" />
            <Label Grid.Row="1" Grid.Column="1" Text="123" />
            <Label Grid.Row="2" Grid.Column="1" Text="123" />

            <Image x:Name="Your_Image_DropDown" Grid.Row="3" 
             Grid.ColumnSpan="2" Source="YOUR IMAGE LINK/SOURCE HERE" 
             HorizontalOptions="Center"/>

        </Grid>
    </StackLayout>
</Expander.Header>
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="AUTO"/>
        <RowDefinition Height="AUTO"/>
        <RowDefinition Height="AUTO"/>
    </Grid.RowDefinitions>

    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*"/>
        <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>

    <Label Grid.Row="0" Text="One label" />
    <Label Grid.Row="1" Text="One label" />
    <Label Grid.Row="2" Text="One label" />

    <Label Grid.Row="0" Grid.Column="1" Text="123" />
    <Label Grid.Row="1" Grid.Column="1" Text="123" />
    <Label Grid.Row="2" Grid.Column="1" Text="123" />

  </Grid>
  </Expander>

赞(0）回复(0）举报 2022-12-07

wvt8vs2t3#

将除MoreDetails之外的所有内容 Package 到另一个堆栈布局中，并将其命名为“TopLayout”

void ShowMore(){
    TopLayout.TranslateTo(0, -TopLayout.Bounds.Height, 300,  Easing.Linear);
    MoreDetails.LayoutTo(new Rectangle(0, 0, MoreDetails.Bounds.Width, MoreDetails.Bounds.Height + TopLayout.Bounds.Height), 300, Easing.Linear);
    }

    void ShowLess(){
    TopLayout.TranslateTo(0, 0, 300,  Easing.Linear);
    MoreDetails.LayoutTo(new Rectangle(0, MoreDetails.Bounds.Height, MoreDetails.Bounds.Width, MoreDetails.Bounds.Height - MoreDetails.Bounds.Height), 300, Easing.Linear);
    }

100 -这是你的位移值
作为奖励：

MoreLessImage.RotateXTo(180, Duration, TargetEasing);

您可以像这样改变按钮，使ShowMore/ShowLess图像具有动画效果，

赞(0）回复(0）举报 2022-12-07

qmelpv7a4#

我们可以使用**Xamarin Community Toolkit的Expander**实现可折叠的视图，Xamarin Community Toolkit还提供了大量的视图、控件、行为、扩展、效果等。

赞(0）回复(0）举报 2022-12-07

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XAML Xamarin表单可折叠堆栈布局

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