XAML Xamarin,根据屏幕方向或大小形成动态布局

uplii1fm  于 2023-02-20  发布在  其他
关注(0)|答案(4)|浏览(93)

Xamarin.Forms是否已经包含一个根据屏幕方向或大小排序内容的控件/布局？
我想要的：如果屏幕有足够的空间，两个水平排列的堆栈布局。当屏幕改变，屏幕没有足够的水平空间时，两个堆栈布局应该垂直排列。
我不想在代码后面做。
我寻找一个只使用xaml的解决方案。

xaml

4条答案

按热度按时间
0qx6xfy6

0qx6xfy61#

我猜你不能只使用XAML来实现这一点。当然，你需要一些c#代码。Xamarin.Forms上的XAML被设计成响应式的，并且你经常以相对模式（而不是绝对模式）定义视图属性。
您可以在本主题中看到所需行为的示例，其中我们可以看到屏幕根据设备方向更改StackLayout的方向（您可以将其作为编写自己的布局组件的指南）

纵向模式下的屏幕：

横向模式下的屏幕：

这是通过以下XAML实现的：

<?xml version="1.0" encoding="UTF-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="ResponsiveLayout.StackLayoutPageXaml"
Title="Stack Photo Editor - XAML">
    <ContentPage.Content>
        <StackLayout Spacing="10" Padding="5" Orientation="Vertical"
        x:Name="outerStack"> <!-- can change orientation to make responsive -->
            <ScrollView>
                <StackLayout Spacing="5" HorizontalOptions="FillAndExpand"
                    WidthRequest="1000">
                    <StackLayout Orientation="Horizontal">
                        <Label Text="Name: " WidthRequest="75"
                            HorizontalOptions="Start" />
                        <Entry Text="deer.jpg"
                            HorizontalOptions="FillAndExpand" />
                    </StackLayout>
                    <StackLayout Orientation="Horizontal">
                        <Label Text="Date: " WidthRequest="75"
                            HorizontalOptions="Start" />
                        <Entry Text="07/05/2015"
                            HorizontalOptions="FillAndExpand" />
                    </StackLayout>
                    <StackLayout Orientation="Horizontal">
                        <Label Text="Tags:" WidthRequest="75"
                            HorizontalOptions="Start" />
                        <Entry Text="deer, tiger"
                            HorizontalOptions="FillAndExpand" />
                    </StackLayout>
                    <StackLayout Orientation="Horizontal">
                        <Button Text="Save" HorizontalOptions="FillAndExpand" />
                    </StackLayout>
                </StackLayout>
            </ScrollView>
            <Image  Source="deer.jpg" />
        </StackLayout>
    </ContentPage.Content>
</ContentPage>

一些C#用于根据设备的方向更改outerStack的方向：

protected override void OnSizeAllocated (double width, double height){
    base.OnSizeAllocated (width, height);
    if (width != this.width || height != this.height) {
        this.width = width;
        this.height = height;
        if (width > height) {
            outerStack.Orientation = StackOrientation.Horizontal;
        } else {
            outerStack.Orientation = StackOrientation.Vertical;
        }
    }
}

希望能帮到你。

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ac1kyiln

ac1kyiln2#

据我所知，这是不可能的。我基本上完全按照你的要求“手动”完成了。不过，这并不太难。首先，你必须将你的堆栈布局 Package 在另一个StackLayout中

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="App.Views.TestPage">
    <ContentPage.Content>
        <StackLayout x:Name="OuterStackLayout">
            <StackLayout>
                <!-- Inner stack layout 1 -->
            </StackLayout>
            <StackLayout>
                <!-- Inner stack layout 2 -->
            </StackLayout>
        </StackLayout>
    </ContentPage.Content>
</ContentPage>

接下来，必须重写OnSizeAllocated，并根据屏幕方向设置外部OuterStackLayout.Orientation

protected override void OnSizeAllocated(double width, double height)
{
    base.OnSizeAllocated(width, height);

    if (SizeHasChanged(width, height)) // elided, just compare width, height with the stored values
    {
        StoreSize(width, height); // store in private members

        if (IsLandscape)
        {
            this.OuterStackLayout.Orientation = StackOrientation.Horizontal;
        }
        else
        {
            this.OuterStackLayout.Orientation = StackOrientation.Vertical;
        }
    }
}

public bool IsLandscape => _width > _height;

也许您需要稍微修改一下内部StackLayout的水平选项或其他布局参数，但基本上这就足够了。

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igsr9ssn

igsr9ssn3#

选项#1“方向状态”-纵向和横向。在可视状态管理器中使用“OrientationStates”，如下所示：
在.XAML文件内部

<Grid x:Name="myGrid"
        Margin="10,30,10,10">
    <VisualStateManager.VisualStateGroups>
        <VisualStateGroup x:Name="OrientationStates">

            <!-- Row & Column Definitions of Grid - [2 Rows, 1 Col = Portrait] & [1 Row, 2 Cols = Landscape] -->
            <VisualState x:Name="Portrait">
                <VisualState.Setters>
                    <Setter Property="Grid.RowDefinitions"
                            Value="*,*" />
                    <Setter Property="Grid.ColumnDefinitions"
                            Value="*" />
                </VisualState.Setters>
            </VisualState>

            <VisualState x:Name="Landscape">
                <VisualState.Setters>
                    <Setter Property="Grid.RowDefinitions"
                            Value="*" />
                    <Setter Property="Grid.ColumnDefinitions"
                            Value="*,*" />
                </VisualState.Setters>
            </VisualState>

        </VisualStateGroup>
    </VisualStateManager.VisualStateGroups>

    <!-- Change position of stack layouts in grid, to match above stated orientation requirement -->
    <StackLayout x:Name="firstStackLayout">
        <Entry Placeholder="Enter first words" />
        <Button Text="Nothing Happens" />

        <VisualStateManager.VisualStateGroups>
            <VisualStateGroup>

                <VisualState x:Name="Portrait">
                    <VisualState.Setters>
                        <Setter Property="Grid.Row" Value="0" />
                        <Setter Property="Grid.Column" Value="0" />
                    </VisualState.Setters>
                </VisualState>

                <VisualState x:Name="Landscape">
                    <VisualState.Setters>
                        <Setter Property="Grid.Row" Value="0" />
                        <Setter Property="Grid.Column" Value="0" />
                    </VisualState.Setters>
                </VisualState>

            </VisualStateGroup>
        </VisualStateManager.VisualStateGroups>
    </StackLayout>

    <StackLayout x:Name="secondStackLayout">
        <Entry Placeholder="Enter last words" />
        <Button Text="Still Nothing Happens" />

        <VisualStateManager.VisualStateGroups>
            <VisualStateGroup>

                <VisualState x:Name="Portrait">
                    <VisualState.Setters>
                        <Setter Property="Grid.Row" Value="1" />
                        <Setter Property="Grid.Column" Value="0" />
                    </VisualState.Setters>
                </VisualState>

                <VisualState x:Name="Landscape">
                    <VisualState.Setters>
                        <Setter Property="Grid.Row" Value="0" />
                        <Setter Property="Grid.Column" Value="1" />
                    </VisualState.Setters>
                </VisualState>

            </VisualStateGroup>
        </VisualStateManager.VisualStateGroups>
    </StackLayout>
</Grid>

在CodeBehind中添加了“OnSizeAllocated（）”函数，如下所示：
在. XAML.CS文件内部

public partial class RegisterPage : ContentPage
{
    public RegisterPage()
    {
        InitializeComponent();
    }

    protected override void OnSizeAllocated(double width, double height)
    {
        base.OnSizeAllocated(width, height);

        var state = (width > height) ? "Landscape" : "Portrait";

        // Call the 'Portrait' & 'Landscape' States in .XAML File
        VisualStateManager.GoToState(myGrid, state);
        VisualStateManager.GoToState(firstStackLayout, state);
        VisualStateManager.GoToState(secondStackLayout, state);
    }
}

[或]
选项#2魔术子弹-您的唯一的.XAML文件解决方案该问题。
“方向触发器”-纵向和横向。
在可视化状态中使用“状态触发器”内的“OrientationStateTriggers”，如下所示：
在.XAML文件内部

<Grid Margin="10,30,10,10">
    <VisualStateManager.VisualStateGroups>
        <VisualStateGroup>

            <!-- Row & Column Definitions of Grid - [2 Rows, 1 Col = Portrait] & [1 Row, 2 Cols = Landscape] -->
            <VisualState x:Name="gridPortrait">

                <VisualState.StateTriggers>
                    <OrientationStateTrigger Orientation="Portrait" />
                </VisualState.StateTriggers>

                <VisualState.Setters>
                    <Setter Property="Grid.RowDefinitions"
                            Value="*,*" />
                    <Setter Property="Grid.ColumnDefinitions" Value="*" />
                </VisualState.Setters>

            </VisualState>

            <VisualState x:Name="gridLandscape">

                <VisualState.StateTriggers>
                    <OrientationStateTrigger Orientation="Landscape" />
                </VisualState.StateTriggers>

                <VisualState.Setters>
                    <Setter Property="Grid.RowDefinitions"
                            Value="*" />
                    <Setter Property="Grid.ColumnDefinitions"
                            Value="*,*" />
                </VisualState.Setters>

            </VisualState>

        </VisualStateGroup>
    </VisualStateManager.VisualStateGroups>

    <!-- Change position of stack layouts in grid, to match above stated orientation requirement -->
    <StackLayout>
        <Entry Placeholder="Enter first words" />
        <Button Text="Nothing Happens" />

        <VisualStateManager.VisualStateGroups>
            <VisualStateGroup>

                <VisualState x:Name="myPortraitState">

                    <VisualState.StateTriggers>
                        <OrientationStateTrigger Orientation="Portrait" />
                    </VisualState.StateTriggers>

                    <VisualState.Setters>
                        <Setter Property="Grid.Row" Value="0" />
                        <Setter Property="Grid.Column" Value="0" />
                    </VisualState.Setters>

                </VisualState>

                <VisualState x:Name="myLandscapeState">

                    <VisualState.StateTriggers>
                        <OrientationStateTrigger Orientation="Landscape" />
                    </VisualState.StateTriggers>

                    <VisualState.Setters>
                        <Setter Property="Grid.Row" Value="0" />
                        <Setter Property="Grid.Column" Value="0" />
                    </VisualState.Setters>

                </VisualState>

            </VisualStateGroup>
        </VisualStateManager.VisualStateGroups>
    </StackLayout>

    <StackLayout>
        <Entry Placeholder="Enter last words" />
        <Button Text="Still Nothing Happens" />

        <VisualStateManager.VisualStateGroups>
            <VisualStateGroup>
                <VisualState x:Name="myPortraitState">
                    <VisualState.StateTriggers>
                        <OrientationStateTrigger Orientation="Portrait" />
                    </VisualState.StateTriggers>
                    <VisualState.Setters>
                        <Setter Property="Grid.Row" Value="1" />
                        <Setter Property="Grid.Column" Value="0" />
                    </VisualState.Setters>
                </VisualState>
                <VisualState x:Name="myLandscapeState">
                    <VisualState.StateTriggers>
                        <OrientationStateTrigger Orientation="Landscape" />
                    </VisualState.StateTriggers>
                    <VisualState.Setters>
                        <Setter Property="Grid.Row" Value="0" />
                        <Setter Property="Grid.Column" Value="1" />
                    </VisualState.Setters>
                </VisualState>

            </VisualStateGroup>
        </VisualStateManager.VisualStateGroups>
    </StackLayout>
</Grid>
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o75abkj4

o75abkj44#

希望我还不算太晚，使用Xamarin.Essentials对我来说是一个更简单的解决方案。
Model.cs

using Xamarin.Essentials;
.
.
.
private DisplayOrientation orientation = DeviceDisplay.MainDisplayInfo.Orientation;
public DisplayOrientation Orientation
{
    get => orientation;
    set => orientation = value;
}

View.xaml.cs

using Xamarin.Essentials;
.
.
.
protected override void OnSizeAllocated(double width, double height)
{
    base.OnSizeAllocated(width, height);
    model.Orientation = DeviceDisplay.MainDisplayInfo.Orientation;
}

View.xaml

<ContentPage xmlns:ess="clr-namespace:Xamarin.Essentials;assembly=Xamarin.Essentials">
    <ContentPage.BindingContext>
        <!--Model here-->
    </ContentPage.BindingContext>
    <DataTrigger TargetType="..."
        Binding="{Binding Orientation}"
        Value="{x:Static ess:DisplayOrientation.Portrait}">
            <Setter Property="..." Value="..." />
    </DataTrigger>
    <DataTrigger TargetType="..."
        Binding="{Binding Orientation}"
        Value="{x:Static ess:DisplayOrientation.Landscape}">
            <Setter Property="..." Value="..." />
    </DataTrigger>
</ContentPage>

不要忘记INotifyPropertyChanged的含义。

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