Xamarin.Forms多列表GUI

问题描述

ListView是创建表的正确选项吗?

Is ListView the right option to create table, something like this ?

单元格内容仅是文本，但我需要能够在单元格触摸上显示类似下拉菜单的内容，其中很少有最常用的选项以及用于自定义输入的文本字段.最多会有80至100行数据，通常要少得多.

Cell content is text only, but I need to be able to show something like drop down menu on cell touch with few most common options and text field for custom entry.There will be at max 80 to 100 lines data, usually much less.

推荐答案

ListView确实是近似表的最佳方法.这是一个例子...

ListView is indeed the best way to approximate a table. Here is an example...

        <ListView x:Name="listViewm" ItemsSource="{Binding MyItems}">
            <ListView.Header>
                <Grid BackgroundColor="Black">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="1*"></ColumnDefinition>
                        <ColumnDefinition Width="1*"></ColumnDefinition>
                        <ColumnDefinition Width="1*"></ColumnDefinition>
                        <ColumnDefinition Width="1*"></ColumnDefinition>
                    </Grid.ColumnDefinitions>
                    <Label Text="Switch" HorizontalOptions="Fill"  Grid.Column="0"   FontSize="Medium" FontAttributes="Bold" BackgroundColor="MediumBlue" TextColor="White" HorizontalTextAlignment="Center" Margin="1"/>
                    <Label Text="Addend 1" HorizontalOptions="Fill"  Grid.Column="1"  FontSize="Medium" FontAttributes="Bold" BackgroundColor="MediumBlue" TextColor="White" HorizontalTextAlignment="Center" Margin="1"/>
                    <Label Text="Addend 2" HorizontalOptions="Fill"  Grid.Column="2"  FontSize="Medium" FontAttributes="Bold" BackgroundColor="MediumBlue" TextColor="White" HorizontalTextAlignment="Center" Margin="1"/>
                    <Label Text="Result" HorizontalOptions="Fill"  Grid.Column="3"  FontSize="Medium" FontAttributes="Bold" BackgroundColor="MediumBlue" TextColor="White" HorizontalTextAlignment="Center" Margin="1"/>
                </Grid>
            </ListView.Header>

            <ListView.ItemTemplate>
                <DataTemplate>
                    <ViewCell>
                        <Grid BackgroundColor="Black">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="1*"></ColumnDefinition>
                                <ColumnDefinition Width="1*"></ColumnDefinition>
                                <ColumnDefinition Width="1*"></ColumnDefinition>
                                <ColumnDefinition Width="1*"></ColumnDefinition>
                            </Grid.ColumnDefinitions>
                            <Label Grid.Column="0" Text ="{Binding Switch}" HorizontalOptions="Fill" BackgroundColor="LightBlue" HorizontalTextAlignment="Center" Margin="1"></Label>
                            <Label Grid.Column="1" Text ="{Binding Addend1}" HorizontalOptions="Fill" BackgroundColor="LightBlue" HorizontalTextAlignment="Center" Margin="1"></Label>
                            <Label Grid.Column="2" Text ="{Binding Addend2}" HorizontalOptions="Fill" BackgroundColor="LightBlue" HorizontalTextAlignment="Center" Margin="1"></Label>
                            <Label Grid.Column="3" Text ="{Binding Result}" HorizontalOptions="Fill" BackgroundColor="LightBlue" HorizontalTextAlignment="Center" Margin="1"></Label>
                        </Grid>
                    </ViewCell>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>

这是视图模型中的代码...

This is the code in the view model...

public class MyItem : INotifyPropertyChanged
{
    bool _switch = false;
    public bool Switch
    {
        get
        {
            return _switch;
        }
        set
        {
            if (_switch != value)
            {
                _switch = value;
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("Switch"));
            }
        }

    }
    public int Addend1 { get; set; }
    public int Addend2 { get; set; }
    public int Result
    {
        get
        {
            return Addend1 + Addend2;
        }
    }
    public string Summary
    {
        get
        {
            return Addend1 + " + " + Addend2 + " = " + Result;
        }
    }
    public event PropertyChangedEventHandler PropertyChanged;
}

//...

public MyItems ObservableCollection<MyItem> { get; set; }

//...

        MyItems = new ObservableCollection<MyItem>();
        MyItems.Add(new MyItem() { Switch = true, Addend1 = 1, Addend2 = 2 });
        MyItems.Add(new MyItem() { Switch = false, Addend1 = 1, Addend2 = 2 });
        MyItems.Add(new MyItem() { Switch = true, Addend1 = 2, Addend2 = 3 });
        MyItems.Add(new MyItem() { Switch = false, Addend1 = 2, Addend2 = 3 });

这将导致一个看起来像这样的表...

This results in a table that looks like this...

不确定为什么列之间的装订线这么宽.

Not sure why gutters between columns are so wide.

您可以在ViewCell.ContextActions上定义菜单项.

You can define menu items on ViewCell.ContextActions.

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