windows-phone-7 - 全景图wp7 mvvm中的静态和动态全景图项目

这是我的情况。

ViewModelA {
    ObservableCollection<Items> ItemsA
    ObservableCollection<ViewModelB> ViewModelBs
}

将数据上下文设置为ViewModel A的View A
ViewA的全景图具有一个列表框，面板，文本块等，并且列表框的项源绑定(bind)到ItemsA

我想在运行时使用通用数据模板(列表框，文本块等)将其他全景项目添加到全景控件。.每个全景项目将在运行时绑定(bind)到ViewModelBs集合中的每个ViewModelB。

我不反对为此做一些代码隐藏的事情，因为我不是严格的mvvm纯粹主义者。
但是，如果我可以指定控件和数据模板并使其正常工作，则解决方案可能很优雅。我是wpf/xaml的新手，并试图通过编写wp7应用程序来突破这些技术。使用mvvm light框架。最终，我希望动态生成的全景图项目/列表框内容在他们将要绑定(bind)的viewmodel ...

这是我尝试无法成功工作的一些代码片段。希望它能提供一些想法。

<phone:PhoneApplicationPage.Resources>
    <Style x:Key="PanoramaItemStyle" TargetType="ContentControl">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ContentControl">
                    <Grid x:Name="ContentGrid">
                        <controls:PanoramaItem x:Name="ItemLocationPanoramaItem" Header="{Binding TagName}">
                            <StackPanel >
                                <ListBox  x:Name="ItemLocatorsList" ItemsSource="{Binding ItemLocators}" Height="496" SelectedItem="{Binding SelectedItemLocation, Mode=TwoWay}" >
                                    <Custom:Interaction.Triggers>
                                        <Custom:EventTrigger EventName="SelectionChanged">
                                            <GalaSoft_MvvmLight_Command:EventToCommand x:Name="SelectionChangedEvent" Command="{Binding RelativeSource={RelativeSource TemplatedParent},Path=DataContext.GoToEditItemLocatorCommand}" PassEventArgsToCommand="True"/>
                                        </Custom:EventTrigger>
                                    </Custom:Interaction.Triggers>
                                    <ListBox.ItemsPanel>
                                        <ItemsPanelTemplate >
                                            <StackPanel Orientation="Vertical"  ScrollViewer.VerticalScrollBarVisibility="Auto" />
                                        </ItemsPanelTemplate>
                                    </ListBox.ItemsPanel>
                                    <ListBox.ItemTemplate>
                                        <DataTemplate>
                                            <StackPanel>
                                                    <StackPanel Orientation="Horizontal" Margin="0,0,0,17">
                                                        <StackPanel Width="311">
                                                            <TextBlock Text="{Binding Path=Item.Name}" TextWrapping="Wrap" Style="{StaticResource PhoneTextLargeStyle}"/>
                                                            <TextBlock Text="{Binding Path=Location.Description}" TextWrapping="Wrap" Margin="12,-6,12,0" Style="{StaticResource PhoneTextSubtleStyle}"/>
                                                        </StackPanel>
                                                    </StackPanel>
                                            </StackPanel>
                                        </DataTemplate>
                                    </ListBox.ItemTemplate>
                                </ListBox>
                            </StackPanel>
                        </controls:PanoramaItem>
                        <ContentPresenter/>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Setter Property="Foreground" Value="White"/>
    </Style>
</phone:PhoneApplicationPage.Resources>

代码背后:
private LocationGroupsViewModel viewModel = null;

    public LocationGroups()
    {
        InitializeComponent();
        LocationGroupsPanaroma.DefaultItem = LocationGroupsPanaroma.Items[0];
         viewModel = this.DataContext as LocationGroupsViewModel;
         CreateDynamicPanaromaItems();
    }


    private void CreateDynamicPanaromaItems()
    {
        foreach (Model.LocationGroup group in viewModel.LocationGroups)
        {
            if (group.TotalItems > 0)
            {
                PanoramaItem pi = new PanoramaItem();
                pi.Header = group.Name;
                pi.Orientation = System.Windows.Controls.Orientation.Horizontal;
                ItemLocationListViewModel itemLocationViewModel = viewModel[group.LocationGroupId];
                pi.DataContext = itemLocationViewModel;
                pi.Style = Resources["PanoramaItemStyle"] as Style;
                LocationGroupsPanaroma.Items.Add(pi);

            }
        }

    }

编辑

ViewModel A有

Items collection

Collection of ViewModelBs

全景图像数据上下文设置为viewmodelA

panaroma item - Statitically created in xaml to some Items collection in ViewModelA

    This pan item has a list box



panaroma items --- to be bound to collection of viewmodelbs

    These pan items should each have a listbox which is selectable
                  and  bound to some collection in View Model B and fires commands on    selection         changed to viewModelB. Currently using the galasoft eventtocommand to hook the selection changed on the
    list box to a relay command. The problem is that this eventtommand should have the viewmodel as its data context and the not the collection (bound to the listbox) within viewmodel.

最佳答案

好，终于有时间回答问题了。提出的解决方案不需要任何代码，仅依赖MVVM概念和数据绑定(bind)。

从概念上讲Panorama控件是ItemPresenter(它继承自ItemsPresenter)，即，您可以将ItemsSource绑定(bind)到包含与PanoramaItems相对应的项的列表。

要渲染PanoramaItem，您将必须提供Panorama.HeaderTemplate和Panorama.ItemTemplate的模板。模板中的DataContext是表示您的ViewModel的PanoramaItem。如果此ViewModel包含一个项目列表，您现在可以使用它生成所需的ListBoxes。

这是示例...

ViewModelLocator.cs

using GalaSoft.MvvmLight;

namespace WP7Test.ViewModel
{
    public class ViewModelLocator
    {
        private static MainViewModel _main;

        public ViewModelLocator()
        {
    if (ViewModelBase.IsInDesignModeStatic) {
        // Create design time services and viewmodels
    } else {
        // Create run time services and view models
    }
            _main = new MainViewModel();
        }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance",
            "CA1822:MarkMembersAsStatic",
            Justification = "This non-static member is needed for data binding purposes.")]
        public MainViewModel Main
        {
            get
            {
                return _main;
            }
        }
    }
}

MainViewModel.cs

public class MainViewModel : ViewModelBase
{
    public MainViewModel()
    {
        this.Items = new ObservableCollection<ItemViewModel>();

        if (IsInDesignMode) {
            // Code runs in Blend --> create design time data.
        } else {
            // Code runs "for real"
        }
        this.LoadData();
    }

    #region [Items]

    public const string ItemsPropertyName = "Items";

    private ObservableCollection<ItemViewModel> _items = default(ObservableCollection<ItemViewModel>);

    public ObservableCollection<ItemViewModel> Items {
        get {
            return _items;
        }
        private set {
            if (_items == value) {
                return;
            }

            var oldValue = _items;
            _items = value;

            RaisePropertyChanged(ItemsPropertyName);
        }
    }

    #endregion

    private void LoadData() {
        this.Items.Add(new ItemViewModel() { LineOne = "runtime one", LineTwo = "Maecenas praesent accumsan bibendum", LineThree = "Facilisi faucibus habitant inceptos interdum lobortis nascetur pharetra placerat pulvinar sagittis senectus sociosqu" });
        this.Items.Add(new ItemViewModel() { LineOne = "runtime two", LineTwo = "Dictumst eleifend facilisi faucibus", LineThree = "Suscipit torquent ultrices vehicula volutpat maecenas praesent accumsan bibendum dictumst eleifend facilisi faucibus" });
        this.Items.Add(new ItemViewModel() { LineOne = "runtime three", LineTwo = "Habitant inceptos interdum lobortis", LineThree = "Habitant inceptos interdum lobortis nascetur pharetra placerat pulvinar sagittis senectus sociosqu suscipit torquent" });

        foreach (var item in Items) {
            for (int i = 0; i < 5; ++i)
                item.Items.Add(new ItemViewModel() { LineOne = "Item " + i, LineTwo = "Maecenas praesent accumsan bibendum" });
        }
    }
}

ItemViewModel.cs

public class ItemViewModel : ViewModelBase
{
    public ItemViewModel() {
        this.Items = new ObservableCollection<ItemViewModel>();

        if (IsInDesignMode) {
            // Code runs in Blend --> create design time data.
        } else {
            // Code runs "for real": Connect to service, etc...
        }
    }

    public override void Cleanup() {
        // Clean own resources if needed

        base.Cleanup();
    }

    #region [LineOne]

    public const string LineOnePropertyName = "LineOne";

    private string _lineOne = default(string);

    public string LineOne {
        get {
            return _lineOne;
        }

        set {
            if (_lineOne == value) {
                return;
            }

            var oldValue = _lineOne;
            _lineOne = value;
            RaisePropertyChanged(LineOnePropertyName);
        }
    }

    #endregion

    #region [LineTwo]

    public const string LineTwoPropertyName = "LineTwo";

    private string _lineTwo = default(string);

    public string LineTwo {
        get {
            return _lineTwo;
        }

        set {
            if (_lineTwo == value) {
                return;
            }

            var oldValue = _lineTwo;
            _lineTwo = value;

            RaisePropertyChanged(LineTwoPropertyName);
        }
    }

    #endregion

    #region [LineThree]

    public const string LineThreePropertyName = "LineThree";

    private string _lineThree = default(string);

    public string LineThree {
        get {
            return _lineThree;
        }

        set {
            if (_lineThree == value) {
                return;
            }

            var oldValue = _lineThree;
            _lineThree = value;
            RaisePropertyChanged(LineThreePropertyName);
        }
    }

    #endregion

    #region [Items]

    public const string ItemsPropertyName = "Items";

    private ObservableCollection<ItemViewModel> _items = default(ObservableCollection<ItemViewModel>);

    public ObservableCollection<ItemViewModel> Items {
        get {
            return _items;
        }
        private set {
            if (_items == value) {
                return;
            }

            var oldValue = _items;
            _items = value;
            RaisePropertyChanged(ItemsPropertyName);
        }
    }

    #endregion
}

MainPage.xaml

<phone:PhoneApplicationPage
    x:Class="WP7Test.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:controls="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="800"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait"  Orientation="Portrait"
    shell:SystemTray.IsVisible="False">

    <!--LayoutRoot is the root grid where all page content is placed-->
    <Grid x:Name="LayoutRoot" Background="Transparent" DataContext="{Binding Main, Source={StaticResource Locator}}">
        <controls:Panorama Title="my application" ItemsSource="{Binding Items}">
            <controls:Panorama.Background>
                <ImageBrush ImageSource="PanoramaBackground.png"/>
            </controls:Panorama.Background>
            <controls:Panorama.HeaderTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding LineOne}"/>
                </DataTemplate>
            </controls:Panorama.HeaderTemplate>
            <controls:Panorama.ItemTemplate>
                <DataTemplate>
                    <StackPanel>
                        <Border BorderThickness="0,0,0,1" BorderBrush="White">
                            <TextBlock Text="{Binding LineTwo}" FontSize="28" TextWrapping="Wrap"/>
                        </Border>
                        <Border BorderThickness="0,0,0,1" Margin="0,20" BorderBrush="White">
                            <TextBlock Text="{Binding LineThree}" TextWrapping="Wrap"/>
                        </Border>
                        <ListBox ItemsSource="{Binding Items}">
                            <ListBox.ItemTemplate>
                                <DataTemplate>
                                    <StackPanel>
                                        <TextBlock Text="{Binding LineOne}" FontSize="24"/>
                                        <TextBlock Text="{Binding LineTwo}" FontSize="18" Margin="24,0,0,5"/>
                                    </StackPanel>
                                </DataTemplate>
                            </ListBox.ItemTemplate>
                        </ListBox>
                    </StackPanel>
                </DataTemplate>
            </controls:Panorama.ItemTemplate>
        </controls:Panorama>
    </Grid>
    <!--Panorama-based applications should not show an ApplicationBar-->
</phone:PhoneApplicationPage>

编辑-添加其他第一面板

最后，我了解您要达到的目标!但是，您仍然不需要后面的代码即可!您只需要一个模板...此Blend确实可以为您提供帮助，因为它可以让您提取现有控件的模板...好的，这里是更改。

首先，我向MainViewModel添加了一个新属性以显示一些数据:

#region [MainPageProperty]

public const string MainPagePropertyPropertyName = "MainPageProperty";
private string _mainPageProperty = "Facilisi faucibus habitant inceptos interdum lobortis nascetur pharetra placerat pulvinar sagittis senectus sociosqu";

public string MainPageProperty {
    get {
        return _mainPageProperty;
    }
    set {
        if (_mainPageProperty == value) {
            return;
        }

        _mainPageProperty = value;
        RaisePropertyChanged(MainPagePropertyPropertyName);
    }
}

#endregion

然后，我使用Blend获取了Panorama控件的模板，并将其插入到controls:Panorama元素中。

<controls:Panorama.Template>
    <ControlTemplate TargetType="controls:Panorama">
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="auto"/>
                <RowDefinition Height="*"/>
            </Grid.RowDefinitions>
            <controlsPrimitives:PanningBackgroundLayer x:Name="BackgroundLayer" HorizontalAlignment="Left" Grid.RowSpan="2">
                <Border x:Name="background" Background="{TemplateBinding Background}" CacheMode="BitmapCache"/>
            </controlsPrimitives:PanningBackgroundLayer>
            <controlsPrimitives:PanningTitleLayer x:Name="TitleLayer" CacheMode="BitmapCache" ContentTemplate="{TemplateBinding TitleTemplate}" Content="{TemplateBinding Title}" FontSize="187" FontFamily="{StaticResource PhoneFontFamilyLight}" HorizontalAlignment="Left" Margin="10,-76,0,9" Grid.Row="0"/>
            <controlsPrimitives:PanningLayer x:Name="ItemsLayer" HorizontalAlignment="Left" Grid.Row="1">
                <StackPanel Orientation="Horizontal">
                    <controls:PanoramaItem Header="Main panel" Width="432">
                        <TextBlock Text="{Binding ElementName=LayoutRoot, Path=DataContext.MainPageProperty}" TextWrapping="Wrap"/>
                    </controls:PanoramaItem>
                    <ItemsPresenter x:Name="items"/>
                </StackPanel>
            </controlsPrimitives:PanningLayer>
        </Grid>
    </ControlTemplate>
</controls:Panorama.Template>

这里有两个技巧，首先，我在StacPanel中插入了一个名称为controlPrimitives:PanningLayer的ItemsPanel下允许有多个元素的元素。在此StackPanel中，我移动了ItemsPresenter并添加了另一个PanoramaItem。但是，重要的一件事是设置Width的PanoramaItem属性，否则面板将扩展到所需的房间。

另一个技巧是，为了访问DataContext，我不得不在Binding中使用ElementName。

希望这显示了MVVM和模板的功能!

关于windows-phone-7 - 全景图wp7 mvvm中的静态和动态全景图项目，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/6500650/