GridView有2列,填充宽度

Question

我想要实现的结果非常简单,列表有2列,宽度相等.在Windows电话7/8这可以很容易地使用来实现ListBox与WrapPanel作为ItemsPanel和设定ItemWidth到240(如屏幕宽度为480).

现在我正在编写一个通用应用程序,但问题是屏幕不能保证宽度为480(看起来甚至不是电话)所以我无法设置ItemWidth我希望它填充宽度的屏幕.使用以下方法,我已经能够达到几乎所需的效果XAML:

<GridView ItemsSource="{Binding Results}" Margin="12">
    <GridView.ItemTemplate>
        <DataTemplate>
            <Grid>
                <Image Source="{Binding SampleImage}" />
            </Grid>
        </DataTemplate>
    </GridView.ItemTemplate>

    <GridView.ItemsPanel>
        <ItemsPanelTemplate>
            <WrapGrid MaximumRowsOrColumns="2" Orientation="Horizontal" HorizontalChildrenAlignment="Stretch" VerticalChildrenAlignment="Stretch">
            </WrapGrid>
        </ItemsPanelTemplate>
    </GridView.ItemsPanel>
</GridView>

这给出了以下结果:

正如所看到的它成功地给出2列具有相等宽度,但Grid在GridView.ItemTemlate没有填满每列的整个宽度.我已经尝试过设置HorizontalAlignment="Stretch"它Grid和GridView它本身没有任何成功.任何人都知道这样做吗？

Answer 1

我的解决方案是:

<GridView ItemsSource="{Binding Results}" Margin="12"
                       SizeChanged="GridView_SizeChanged"
                       x:Name="MyGridView">
<GridView.ItemTemplate>
    <DataTemplate>
        <Grid>
            <Image Source="{Binding SampleImage}" />
        </Grid>
    </DataTemplate>
</GridView.ItemTemplate>

<GridView.ItemContainerStyle>
            <Style TargetType="GridViewItem">
                <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                <Setter Property="HorizontalAlignment" Value="Stretch"/>
                <Setter Property="VerticalContentAlignment" Value="Stretch"/>
                <Setter Property="VerticalAlignment" Value="Stretch"/>
            </Style>
</GridView.ItemContainerStyle>
</GridView>

代码背后:

private void GridView_SizeChanged(object sender, SizeChangedEventArgs e)
    {
        var panel = (ItemsWrapGrid)MyGridView.ItemsPanelRoot;
        panel.ItemWidth =panel.ItemHeight= e.NewSize.Width / 2;
    }

Answer 2

你可以试试这个:

<GridView.ItemContainerStyle>
    <Style
        TargetType="GridViewItem">
        <Setter
            Property="HorizontalAlignment"
            Value="Stretch" />
        <Setter
            Property="VerticalAlignment"
            Value="Stretch" />
    </Style>
 </GridView.ItemContainerStyle>

你可以尝试的另一件事是手动设置ItemWidth/ ItemHeight每当你得到SizeChanged事件GridView.

如果出于某种原因上述情况不起作用 - 您也可以执行以下操作并更新事件中Value的两个DoubleViewModel资源SizeChanged:

<UserControl.Resources>
    <viewModels:DoubleViewModel
        x:Key="ItemWidth"
        Value="120" />
    <viewModels:DoubleViewModel
        x:Key="ItemHeight"
        Value="120" />
</UserControl.Resources>

...

<ItemsControl.ItemTemplate>
    <DataTemplate>
        <local:YourItemTemplateControl
            Width="{Binding Value, Source={StaticResource ItemWidth}}"
            Height="{Binding Value, Source={StaticResource ItemHeight}}" />
    </DataTemplate>
</ItemsControl.ItemTemplate>

在哪里DoubleViewModel:

public class DoubleViewModel : BindableBase
{
    #region Value
    /// <summary>
    /// Backing field for the Value property.
    /// </summary>
    private double value;

    /// <summary>
    /// Gets or sets a value indicating the value.
    /// </summary>
    public double Value
    {
        get { return this.value; }
        set { this.SetProperty(ref this.value, value); }
    }
    #endregion
}

Answer 3

我使用的解决方案基于Filip Skakuns的建议,但通过使用此行为进行可重用的用户控制,实现了略微不同的实现.用户控件具有(以及其他)Columns和ItemsSource属性.我改变ItemWidth的ItemsWrapGrid,而不是宽度ItemTemplate和直接做这个SizeChanged事件处理程序.

我还需要使用a ItemsWrapGrid而不是a WrapGrid来工作.最终用户控件的XAML:

<UserControl
    x:Class="MyProject.CustomControls.ColumnGridView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Name="ControlRoot">

    <Grid DataContext="{Binding ElementName=ControlRoot}">
        <GridView ItemsSource="{Binding ItemsSource}" ItemTemplate="{Binding ItemTemplate}">
            <GridView.ItemsPanel>
                <ItemsPanelTemplate>
                    <ItemsWrapGrid Orientation="Horizontal" SizeChanged="ItemsWrapGrid_SizeChanged" />
                </ItemsPanelTemplate>
            </GridView.ItemsPanel>
        </GridView>
    </Grid>
</UserControl>

对于代码隐藏:

using System;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;

namespace MyProject.CustomControls
{
    public sealed partial class ColumnGridView : UserControl
    {
        public static readonly DependencyProperty ItemTemplateProperty =
            DependencyProperty.Register("ItemTemplate", typeof(DataTemplate), typeof(ColumnGridView), new PropertyMetadata(null));

        public DataTemplate ItemTemplate
        {
            get { return (DataTemplate)GetValue(ItemTemplateProperty); }
            set { SetValue(ItemTemplateProperty, value); }
        }

        public static readonly DependencyProperty ItemsSourceProperty =
            DependencyProperty.Register("ItemsSource", typeof(object), typeof(ColumnGridView), new PropertyMetadata(null));

        public object ItemsSource
        {
            get { return (object)GetValue(ItemsSourceProperty); }
            set { SetValue(ItemsSourceProperty, value); }
        }

        public static readonly DependencyProperty ColumnsProperty =
            DependencyProperty.Register("Columns", typeof(int), typeof(ColumnGridView), new PropertyMetadata(1));

        public int Columns
        {
            get { return (int)GetValue(ColumnsProperty); }
            set
            {
                if (value <= 0) throw new ArgumentOutOfRangeException("Columns must be greater than 0");
                SetValue(ColumnsProperty, value);
            }
        }

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

        private void ItemsWrapGrid_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            ItemsWrapGrid itemsWrapGrid = sender as ItemsWrapGrid;
            if (itemsWrapGrid != null)
            {
                itemsWrapGrid.ItemWidth = e.NewSize.Width / Columns;
            }
        }
    }
}