Prism Region Manager RequestNavigate не перемещается после второго клика - PullRequest
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Prism Region Manager RequestNavigate не перемещается после второго клика

0 голосов
/ 05 марта 2020

Почему я не могу нажать кнопку «Образцы», и она возвращает меня к пользовательскому элементу управления, который я хочу, после второго нажатия кнопки.

Вот настройка приложения :

ShellView XAML Сводка: Когда пользователь нажимает на элемент дерева, он направляет их в пользовательский элемент управления. Для этого примера мы можем сосредоточиться на кнопке «Образцы». При нажатии на «Образцы» он направляет пользователя к представлению «WIOASamples», которое заполняется в области «WIOARegion», расположенной в ShellView xaml. Это представление «WIOASamples» имеет представление списка, которое при щелчке по строке направляется в представление сведений под названием «WIOADataEntry», которое отображается через область «WIOARegion», расположенную в xaml ShellView.

Проблема: когда пользователь находится в подробном представлении и пытается нажать кнопку «Образцы», он возвращается к пользовательскому элементу управления Listview. Тем не менее, если щелкнуть запись в представлении списка и перейти в пользовательский элемент управления «Подробности» и попытаться нажать кнопку «Образцы», она не вернется назад. Есть что-то, что я делаю неправильно? См. XAML / код ниже

Shell View XAML: область фокуса будет областью содержимого и элементом дерева примеров. 

 <Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="200"/>
        <ColumnDefinition Width="211*"/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition/>
    </Grid.RowDefinitions>
    <ContentControl MinHeight="20" Visibility="Collapsed" prism:RegionManager.RegionName="WIOARibbon" Grid.ColumnSpan="2"  Margin="0"/>
    <Grid Background="WhiteSmoke" Grid.Row="1"  Grid.Column="0" Margin="0">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition />
        </Grid.RowDefinitions>
        <TextBlock Text="SRM DASHBOARD" Foreground="DarkGray" Margin="10" FontSize="20" />
        <StackPanel Grid.Row="1" Margin="5" Orientation="Vertical">
            <TextBlock Visibility="Collapsed" Text="Board" VerticalAlignment="Center" Margin="5 0"/>
            <ComboBox Width="150" SelectedIndex="0" DisplayMemberPath="board_name"  ItemsSource="{Binding lstBoards}" Text="{Binding BoardNumber, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" >

            </ComboBox>
            <TextBlock HorizontalAlignment="Center" Padding="5" Margin="5 0" VerticalAlignment="Center">
                    <Hyperlink Command="{Binding SendMessageCommand}">Change</Hyperlink>
            </TextBlock>



        </StackPanel>
        <ScrollViewer  VerticalContentAlignment="Stretch" Grid.Row="2">
            <TreeView Name="treeView" PreviewMouseWheel="treeView_PreviewMouseWheel" VerticalContentAlignment="Stretch" ScrollViewer.VerticalScrollBarVisibility="Auto" >
                <TreeViewItem   IsExpanded="True">
                    <TreeViewItem.Header>
                        <StackPanel Orientation="Horizontal">
                            <materialDesign:PackIcon Margin="5" VerticalAlignment="Center" Kind="Database"/>
                            <TextBlock VerticalAlignment="Center" Text="WIOA TAA Samples"/>
                        </StackPanel>
                    </TreeViewItem.Header>
                    <TreeViewItem   >
                        <TreeViewItem.Header>
                            <StackPanel Orientation="Horizontal">
                                <materialDesign:PackIcon Margin="5" VerticalAlignment="Center" Kind="Layers"/>
                                <TextBlock VerticalAlignment="Center" Text="Samples"/>
                            </StackPanel>
                        </TreeViewItem.Header>


                        <i:Interaction.Triggers>
                            <i:EventTrigger EventName="Selected">
                                <i:InvokeCommandAction Command="{Binding WIOASamplesCommand}" CommandParameter="{Binding ElementName=treeView, Path=SelectedItem}"/>
                            </i:EventTrigger>
                        </i:Interaction.Triggers>
                    </TreeViewItem>


                    <TreeViewItem  >
                        <TreeViewItem.Header>
                            <StackPanel Orientation="Horizontal">
                                <materialDesign:PackIcon Margin="5" VerticalAlignment="Center" Kind="ChartBar"/>
                                <TextBlock VerticalAlignment="Center" Text="Reports"/>
                            </StackPanel>
                        </TreeViewItem.Header>
                        <i:Interaction.Triggers>
                            <i:EventTrigger EventName="Selected">
                                <i:InvokeCommandAction Command="{Binding WIOAReportsCommand}" CommandParameter="{Binding ElementName=treeView, Path=SelectedItem}"/>
                            </i:EventTrigger>
                        </i:Interaction.Triggers>
                    </TreeViewItem>

                    <TreeViewItem >
                        <TreeViewItem.Header>
                            <StackPanel Orientation="Horizontal">
                                <materialDesign:PackIcon Margin="5" VerticalAlignment="Center" Kind="Edit"/>
                                <TextBlock VerticalAlignment="Center" Text="Element Editor"/>
                            </StackPanel>
                        </TreeViewItem.Header>
                    </TreeViewItem>
                </TreeViewItem>

                <TreeViewItem Header="Importer" IsExpanded="True">
                    <TreeViewItem Header="WIOA TAA Import" />
                    <TreeViewItem Header="BATS Import" />

                </TreeViewItem>

            </TreeView>
        </ScrollViewer>





        <!--<RadioButton IsChecked="True" Content="WIOA TAA Samples" FontSize="18" Foreground="#FF3E3E3E" Style="{StaticResource buttonstripe1}" Command="{Binding TestViewCommand}" />
        <RadioButton Content="BATS" FontSize="18" Foreground="#FF3E3E3E" Style="{StaticResource buttonstripe1}" Command="{Binding BATSCommand}" />
        <RadioButton Content="Importer" FontSize="18" Foreground="#FF3E3E3E" Style="{StaticResource buttonstripe1}" Command="{Binding ImporterCommand}" />-->

    </Grid>



    <ContentControl MinWidth="80"  prism:RegionManager.RegionName="WIOARegion" Grid.Column="1" Grid.Row="1" Margin="0"/>

</Grid>

ShellView Code Behind 

    public class SRMShellViewModel : BindableBase, INavigationAware
    {
        IRegionManager _regionManager;
        IRegionNavigationJournal _journal;
        IEventAggregator _ea;


        #region Commands
        public DelegateCommand TestViewCommand { get; set; }
        public DelegateCommand WIOASamplesCommand { get; set; }
        public DelegateCommand WIOAReportsCommand { get; set; }
        public DelegateCommand WIOAEditorCommand { get; set; }

        public DelegateCommand BATSCommand { get; set; }
        public DelegateCommand GoBackCommand { get; set; }

        public DelegateCommand ImporterCommand { get; set; }

        #endregion





        public SRMShellViewModel(IRegionManager regionManager, IEventAggregator ea)
        {
            _regionManager = regionManager;
            _ea = ea;


            TestViewCommand = new DelegateCommand(NavigateToTestView);
            BATSCommand = new DelegateCommand(NavigateToBAMView);
            ImporterCommand = new DelegateCommand(NavigateToImporter);

            WIOAEditorCommand = new DelegateCommand(NavigateToWIOAEditor);
            WIOASamplesCommand = new DelegateCommand(NavigateToWIOASamples);
            WIOAReportsCommand = new DelegateCommand(NavigateToWIOAReports);
            GoBackCommand = new DelegateCommand(GoBack);


        }


        private void NavigateToWIOASamples()
        {
            MessageBox.Show("YOU CLICKED ME");
            _regionManager.RequestNavigate("WIOARegion", "WIOASamples");
            _regionManager.RequestNavigate("WIOARibbon", "WIOARibbon");
        }

        private void NavigateToWIOAReports()
        {
            _regionManager.RequestNavigate("WIOARegion", "WIOAReports");
            _regionManager.RequestNavigate("WIOARibbon", "WIOARibbon");
        }

        private void NavigateToWIOAEditor()
        {
            _regionManager.RequestNavigate("WIOARegion", "WIOAImportLogin");
            _regionManager.RequestNavigate("WIOARibbon", "WIOARibbon");
        }


        private void NavigateToTestView()
        {
            _regionManager.RequestNavigate("WIOARegion", "WIOASampleIndex");
            _regionManager.RequestNavigate("WIOARibbon", "WIOARibbon");
        }

        private void NavigateToImporter()
        {
            _regionManager.RequestNavigate("WIOARegion", "ViewA");
        }

        private void NavigateToBAMView()
        {
            _regionManager.RequestNavigate("WIOARegion", "BatsIndex");
            _regionManager.RequestNavigate("WIOARibbon", "BATSRibbon");
        }

        #region INavigationAware
        public void OnNavigatedTo(NavigationContext navigationContext)
        {
            _journal = navigationContext.NavigationService.Journal;

        }

        public bool IsNavigationTarget(NavigationContext navigationContext)
        {
            return true;
        }

        public void OnNavigatedFrom(NavigationContext navigationContext)
        {
         //   MessageBox.Show("YOU are navigating from  ME");
            _journal = navigationContext.NavigationService.Journal;
            var q = navigationContext.NavigationService.Journal.CurrentEntry;

        }

    }

Примеры XAML 

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <StackPanel Visibility="Collapsed" Grid.RowSpan="2" Orientation="Vertical" Margin="0,0,738,0">

        <Button Visibility="Collapsed" Content="Adults" HorizontalContentAlignment="Left" Command="{Binding AdultCommand}" Background="{x:Null}" BorderBrush="{x:Null}" Foreground="#FF3E3E3E"  />

        <Button Visibility="Collapsed" Margin="0 5" HorizontalContentAlignment="Left" Content="Youth" Command="{Binding YouthCommand}" Background="{x:Null}" BorderBrush="{x:Null}" Foreground="#FF3E3E3E"   />

        <Button Visibility="Collapsed" Margin="0 5" HorizontalContentAlignment="Left" Content="DW" Command="{Binding DWCommand}" Background="{x:Null}" BorderBrush="{x:Null}" Foreground="#FF3E3E3E" />

        <Button Visibility="Collapsed"  HorizontalContentAlignment="Stretch"  VerticalAlignment="Stretch" Margin="10" Background="{x:Null}" BorderBrush="#FF646464" >
            <Grid >
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="100"/>
                    <ColumnDefinition Width="*"/>
                </Grid.ColumnDefinitions>
                <StackPanel Orientation="Vertical">
                    <materialDesign:PackIcon  Foreground="#FF646464" Kind="PersonChild" Height="51" Width="56"/>
                    <TextBlock Text="WIOA NDW" Foreground="#FF646464" FontSize="16"/>
                </StackPanel>
                <TextBlock Text="8" HorizontalAlignment="Right" Foreground="#FF646464" FontSize="36" Grid.Column="1"/>

            </Grid>
        </Button>

        <Button Visibility="Collapsed" Content="TAA" Margin="0 5" HorizontalContentAlignment="Left" Command="{Binding TAACommand}" Background="{x:Null}" BorderBrush="{x:Null}" Foreground="#FF3E3E3E" />

    </StackPanel>

    <Button Content="Export" Grid.Row="0" Margin="0,10,10,10" HorizontalAlignment="Right"/>
    <TextBlock Visibility="Collapsed" Text="{Binding BoardNumber, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>

    <StackPanel Orientation="Horizontal">
        <TextBlock VerticalAlignment="Center" Margin="5" Text="Program" Opacity=".56"/>
        <ComboBox Margin="5" Grid.Column="1" MinWidth="200" SelectedIndex="0" Text="{Binding ProgramName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
            <ComboBoxItem Content="WIOA Adult"/>
            <ComboBoxItem Content="WIOA Youth"/>
            <ComboBoxItem Content="WIOA Dislocated Worker"/>
            <ComboBoxItem Content="Hurricane Harvey NDWG"/>
            <ComboBoxItem Content="Trade Adjustment Act "/>
        </ComboBox>
    </StackPanel>




    <ListView Grid.Row="1" Margin="10" Name="lvUsers" ItemsSource="{Binding lstOfSamples, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
        <ListView.View>
            <GridView>
                <GridViewColumn Header="First Name" Width="150" DisplayMemberBinding="{Binding first_name}" />
                <GridViewColumn Header="Last Name" Width="150" DisplayMemberBinding="{Binding last_name}" />
                <GridViewColumn Header="Customer ID" Width="150" DisplayMemberBinding="{Binding customer_id}" />
                <GridViewColumn Header="Board" Width="100" DisplayMemberBinding="{Binding wda_no, FallbackValue=Incomplete}" />


                <GridViewColumn Header="" Width="150">
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <Button Content="View" Command="{Binding PersonSelectedCommand}"/>
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>
            </GridView>
        </ListView.View>
    </ListView>

    <ListBox Visibility="Collapsed" Margin="160,10,10,10" ItemsSource="{Binding lstOfSamples, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" >

        <ListBox.ItemTemplate>
            <DataTemplate>
                <StackPanel Orientation="Horizontal">

                    <TextBlock VerticalAlignment="Center" Text="{Binding first_name}"/>
                    <TextBlock VerticalAlignment="Center" Text="  "/>
                    <TextBlock VerticalAlignment="Center" Text="{Binding last_name}"/>
                    <TextBlock VerticalAlignment="Center" Text="  "/>
                    <TextBlock VerticalAlignment="Center" Text="{Binding customer_id}"/>

                    <Button Content="View" Margin="10"/>
                </StackPanel>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>

</Grid>

Образцы C#

 public class WIOASamplesViewModel : BindableBase, INavigationAware
{
    IEventAggregator _ea;
    IRegionManager _regionManager;
    IRegionNavigationJournal _journal;



    private int _board_number;
    public int BoardNumber
    {
        get { return _board_number; }
        set { SetProperty(ref _board_number, value); }
    }

    private string _programName;
    public string ProgramName
    {
        get { return _programName; }
        set 
        { 
            SetProperty(ref _programName, value);
            lstOfSamples = GetSampleData(ProgramName, Convert.ToInt32(BoardNumber));
        }
    }




    private wioa_sample_data_view_model _wioa_sample_data_view_model;
    public wioa_sample_data_view_model wioa_sample_data_view_model
    {
        get { return _wioa_sample_data_view_model; }
        set { SetProperty(ref _wioa_sample_data_view_model, value); }
    }


    private ObservableCollection<WIOAListViewModel> _lstOfSamples;
    public ObservableCollection<WIOAListViewModel> lstOfSamples
    {
        get { return _lstOfSamples; }
        set { SetProperty(ref _lstOfSamples, value); }
    }



    public WIOASamplesViewModel(IEventAggregator ea, IRegionManager regionManager)
    {
        _regionManager = regionManager;
        _ea = ea;
        _ea.GetEvent<MessageSentEvent>().Subscribe(MessageReceived);
        // lstOfSamples = GetSampleData("WIOA Adult", 1);

    }

    private void MessageReceived(string message)
    {
        message = message.Remove(2);
        lstOfSamples = GetSampleData(ProgramName, Convert.ToInt32(message));
        BoardNumber = Convert.ToInt32(message);
      //  Messages.Add(message);
    }



    ObservableCollection<WIOAListViewModel> GetSampleData(string program, int boardNumber)
    {
        //ProgramName = program;
        ObservableCollection<WIOAListViewModel> lst = new ObservableCollection<WIOAListViewModel>();
        var qry = DatabaseHelper.audit_sample_repo.GetSampleByProgram(program, boardNumber);
        // var qry = DatabaseHelper.audit_sample_repo.GetAll();
        foreach (var record in qry)
        {
            WIOAListViewModel model = new WIOAListViewModel(_regionManager);
            model.id = record.id;
            model.first_name = record.first_name;
            model.last_name = record.last_name;
            model.customer_id = record.customer_id;
            model.wda_no = record.wda_no;
            model.program = record.program;

            lst.Add(model);
        }
        return lst;
    }

    public void OnNavigatedTo(NavigationContext navigationContext)
    {
        _journal = navigationContext.NavigationService.Journal;
        if (BoardNumber == 0)
        {
            BoardNumber = 1;
            lstOfSamples = GetSampleData(ProgramName, BoardNumber);
        }
    }

    public bool IsNavigationTarget(NavigationContext navigationContext)
    {
        return true;
        //throw new NotImplementedException();
    }

    public void OnNavigatedFrom(NavigationContext navigationContext)
    {
        _journal = navigationContext.NavigationService.Journal;

    }

}

Для пользователя, чтобы перейти в представление сведений для выбранной строки, это делается путем привязки команды кнопки к модели. Код ниже: 

public class WIOAListViewModel : BindableBase, INavigationAware
{
    IRegionManager _regionManager;
    IRegionNavigationJournal _journal;

    private int _id;
    public int id
    {
        get { return _id; }
        set { SetProperty(ref _id, value); }
    }


    private int _wda_no;

    public int wda_no
    {
        get { return _wda_no; }
        set { _wda_no = value; }
    }


    private string _first_name;
    public string first_name
    {
        get { return _first_name; }
        set { SetProperty(ref _first_name, value); }
    }

    private string _last_name;
    public string last_name
    {
        get { return _last_name; }
        set { SetProperty(ref _last_name, value); }
    }

    private int _customer_id;
    public int customer_id
    {
        get { return _customer_id; }
        set { SetProperty(ref _customer_id, value); }
    }


    private string _program;
    public string program
    {
        get { return _program; }
        set { SetProperty(ref _program, value); }
    }


    public WIOAListViewModel(IRegionManager regionManager)
    {
        _regionManager = regionManager;
        PersonSelectedCommand = new DelegateCommand<WIOAListViewModel>(PersonSelected);
    }


    public DelegateCommand<WIOAListViewModel> PersonSelectedCommand { get; private set; }





    private void PersonSelected(WIOAListViewModel person)
    {
        var parameters = new NavigationParameters();
        parameters.Add("person", this);

        if (this != null)
            _regionManager.RequestNavigate("WIOARegion", "WIOADataEntry", parameters);
    }

    public void OnNavigatedTo(NavigationContext navigationContext)
    {
        _journal = navigationContext.NavigationService.Journal;
        PersonSelectedCommand.RaiseCanExecuteChanged();
    }

    public bool IsNavigationTarget(NavigationContext navigationContext)
    {
        return true;
    }

    public void OnNavigatedFrom(NavigationContext navigationContext)
    {
      //  throw new NotImplementedException();
    }

}
...