c# - 在 UWP Xaml 中创建和填充 NxN 网格

Question

我正在尝试创建一个 UWP 益智游戏，我想将图片切割成 n 个部分，然后在网格中显示这些部分。

我的问题是，如何强制使用某种 NxN 样式。现在我必须最大化窗 Eloquent 能看到 3x3 的网格，如果我缩小任一侧，它将收敛到一个 2 列、1 列的网格。有办法处理吗？

这就是我所做的，我知道 RowDefinition 现在是手动的，直到我找到更好的方法。

<UserControl
    x:Class="PictureSplitter.Views.PictureView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300"
    d:DesignWidth="400">


        <GridView ItemsSource="{Binding Splitter.PuzzlePositions}">

            <GridView.ItemTemplate>
                <DataTemplate>
                    <Border BorderBrush="Red" BorderThickness="2">
                    <Grid x:Name="picGrid">
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto"></RowDefinition>
                            <RowDefinition Height="Auto"></RowDefinition>
                            <RowDefinition Height="Auto"></RowDefinition>
                        </Grid.RowDefinitions>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="Auto"></ColumnDefinition>
                            <ColumnDefinition Width="Auto"></ColumnDefinition>
                            <ColumnDefinition Width="Auto"></ColumnDefinition>
                        </Grid.ColumnDefinitions>
                        <Image Source="{Binding Piece.ImageSource}" />
                    </Grid>
                </Border>
                </DataTemplate>
            </GridView.ItemTemplate>

        </GridView>

</UserControl>

这是两个示例图像:

Answer 1

可能有几种方法可以做到这一点，这是另一种方法。我修改了 UserControl，以便在页面大小更改和/或集合更改时自动调整项目大小以将它们显示为正方形网格。

用户控件 XAML 代码:

<UserControl
    x:Class="MyControls.MyUserControl"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:MyControls"
    Name="myControl">

    <GridView Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" ItemsSource="{Binding ElementName=myControl, Path=Items}"
              Width="{Binding ElementName=myControl, Path=CurrentWidth}" HorizontalAlignment="Center"
              Height="{Binding Width, RelativeSource={RelativeSource Self}}">
        <GridView.ItemContainerStyle>
            <Style TargetType="GridViewItem">
                <Setter Property="Margin" Value="0"/>
            </Style>
        </GridView.ItemContainerStyle>
        <GridView.ItemTemplate>
            <DataTemplate>
                <Border Padding="10" Width="{Binding ElementName=myControl, Path=ElementSize}" Height="{Binding ElementName=Width, RelativeSource={RelativeSource Self}}">
                    <Border BorderBrush="Red" BorderThickness="3">
                        <Image Source="ms-appx:///Assets/StoreLogo.png" Stretch="UniformToFill"/>
                    </Border>
                </Border>
            </DataTemplate>
        </GridView.ItemTemplate>
    </GridView>
</UserControl>

背后的UserControl代码:

public sealed partial class MyUserControl : UserControl, INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    private void RaiseProperty(string name) => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));

    public IList Items
    {
        get { return (IList)GetValue(ItemsProperty); }
        set { SetValue(ItemsProperty, value); }
    }

    public static readonly DependencyProperty ItemsProperty =
        DependencyProperty.Register("Items", typeof(IList), typeof(MyUserControl),
            new PropertyMetadata(0, (s, e) =>
            {
                if (Math.Sqrt((e.NewValue as IList).Count) % 1 != 0)
                    Debug.WriteLine("Bad Collection");
            }));

    public void Items_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
    {
        if (Math.Sqrt(Items.Count) % 1 != 0) Debug.WriteLine("Bad Collection");
        RaiseProperty(nameof(ElementSize));
    }

    private double currentWidth;
    public double CurrentWidth
    {
        get { return currentWidth; }
        set { currentWidth = value; RaiseProperty(nameof(CurrentWidth)); RaiseProperty(nameof(ElementSize)); }
    }

    public double ElementSize => (int)(currentWidth / (int)Math.Sqrt(Items.Count)) - 1;

    public MyUserControl()
    {
        this.InitializeComponent();
    }
}

主页 XAML:

<Grid>
    <local:MyUserControl x:Name="myControl" Items="{Binding MyItems}"/>
    <Button Content="Add" Click="Button_Click"/>
</Grid>

MainPage 背后的代码:

public sealed partial class MainPage : Page
{
    private ObservableCollection<int> myItems = new ObservableCollection<int> { 1, 2, 3, 4, 5, 6, 7, 8 };
    public ObservableCollection<int> MyItems
    {
        get { return myItems; }
        set { myItems = value; }
    }

    public MainPage()
    {
        this.InitializeComponent();
        DataContext = this;
        MyItems.CollectionChanged += myControl.Items_CollectionChanged;
    }

    protected override Size MeasureOverride(Size availableSize)
    {
        myControl.CurrentWidth = Math.Min(availableSize.Height, availableSize.Width);
        return base.MeasureOverride(availableSize);
    }

    private void Button_Click(object sender, RoutedEventArgs e) => MyItems.Add(3);
}

程序以“Bad Collection”开始 - 有 8 个项目，所以你不能用它们制作一个正方形网格，但只要你点击提供的按钮 - 集合的计数就会变为 9，网格应该更新本身。