CODEWITHSUNDEEP
c#wpfxamlevent-handlingframe
greentea
greentea

Reputation: 357

How do I access the child element of a Frame?

I have frames in my main window which are set to visible/collapsed based on user input:

<Grid>
    <ScrollViewer x:Name="ScrollViewer1" Grid.Row="1" Grid.ColumnSpan="3" Margin="10,0,0,0" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto">
           <Frame Name="InputsFrame" Source="Inputs.xaml" NavigationUIVisibility="Hidden" Visibility="Visible" 
                   ScrollViewer.CanContentScroll="True" />
    </ScrollViewer>

    <ScrollViewer x:Name="ScrollViewer2" Grid.Row="1" Grid.ColumnSpan="3" Margin="10,0,0,0" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto" Visibility="Collapsed">
        <Frame Name="LoadCasesFrame" Source="LoadCases.xaml" NavigationUIVisibility="Hidden" Visibility="Collapsed"
                   ScrollViewer.CanContentScroll="True" />
    </ScrollViewer>

    <!-- etc -->

</Grid>

The Inputs.xaml frame basically just consists of a 3rd party DoubleTextBox control (over 100 of them), and the user can just enter in values to that page. C# code behind:

private void InputsTab_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
    LoadCasesFrame.Visibility = Visibility.Collapsed;
    ScrollViewer2.Visibility = Visibility.Collapsed;

    InputsFrame.Visibility = Visibility.Visible;
    ScrollViewer1.Visibility = Visibility.Visible;
}

In this main window, there is a menu on top to allow for saving and opening the file. When I open the file, I want the data to be read (which I am able to do successfully) and also for the UI in the Inputs.xaml file to be updated.

The following code is in Inputs.xaml.cs:

public void LoadValues()
{
    List<DoubleTextBox> dtb1 = App.GetLogicalChildCollection<DoubleTextBox>(inputsGrid);

    for (int i = 0; i < dtb1.Count; i++)
    {
        foreach (var keyValuePair in App.globalDictionary)
        {
            var doubleTextBox = dtb1[i] as DoubleTextBox;

            if (doubleTextBox.Name == keyValuePair.Key)
            {
                doubleTextBox.Value = 500;
                break;
            }
        }
    }
}

This function works (all the values in the GUI update to 500) when I call it from the Inputs.xml.cs page (for example, when I put it in the Page_Loaded event). However, I need to call this function from the MainWindow, since that is where the event handler for the Open File event is located:

private void openProject_Click(object sender, RoutedEventArgs e)
{
    OpenFileDialog openFileDialog = new OpenFileDialog();
    if (openFileDialog.ShowDialog() == true)
    {
        string stringToDeserialize = File.ReadAllText(openFileDialog.FileName);
        App.DeserializeJSONString(stringToDeserialize);
    }

    // call LoadValues here
}

Calling LoadValues() above doesn't update the GUI in the Input.xaml page. I originally had something like this in my MainWindow:

Inputs _inputs = new Inputs();
_inputs.LoadValues();

I know that the problem is that I have created a new object for Inputs and that's probably why it's not working. I'm unsure how to do it so that I don't use a new object -- wonder if I could use the InputsFrame somehow. I've also tried using event handlers to no success.

Upvotes: 3

Views: 2246

Answers (1)

Peter Duniho
Peter Duniho

Reputation: 70701

If you want to interact with the Inputs object that is in your Frame element, you need to retrieve that one, not create a new one.

You can do that like this:

((Inputs)InputsFrame.Content).LoadValues();

I.e. the Contents property of the Frame returns a reference to the Inputs object that is used to populate the Frame. Just cast that to Inputs to access the appropriate members of that class, such as LoadValues().

Upvotes: 2

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