Question

I have a WPF application (Window 1) with a ScrollViewer on it. I have a second window that is apart of the same WPF application, that has a button on it.

When I click the button on the second window, I want it to add an item to the ScrollViewer on the first window.

How can I accomplish this? Sorry if this is vague, I’m not sure how to ask this question.

Answer 1

First, you’ll need a DispatcherTimer and you’ll have to use StackPanel instead of Grid. You’ll also need to declare a public static bool on Window1. Then, when the button on Window2 is clicked, the bool is set to True which means to execute a void that will add the object to the StackPanel or the Scroll Viewer

XAML

^Window1.xaml

First, you will need to change Grid to StackPanel. Assuming that you have a ScrollViewer with the name scrollViewer1, and Margin = "37,36,58,36", You should try the following

Change the following

<Grid>
    <ScrollViewer Margin="37,36,58,36" Name="scrollViewer1" />
</Grid>

to

<StackPanel x:Name="stackPanel">
    <ScrollViewer Margin="37,36,58,36" Name="scrollViewer1" />
</StackPanel>

So that you would be able to use a StackPanel instead of a Grid of a name stackPanel
 

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C#

^Window1.xaml

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public static bool AddItem = false; //This must be public and static so that it can be called from your second Window
        public Window1()
        {
            InitializeComponent();
        }
        public void AddToScrollViewer()
        {
            Button _Object = new Button(); //Create a new object, change button to the UIElement you would like to be
            stackPanel.Children.Add(_Object); //Add the UIElement to the StackPanel
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            System.Windows.Threading.DispatcherTimer dispatcherTimer = new System.Windows.Threading.DispatcherTimer(); //Initialize a new timer object
            dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick); //Link the Tick event with dispatcherTimer_Tick
            dispatcherTimer.Interval = new TimeSpan(0, 0, 1); //Set the Timer Interval
            dispatcherTimer.Start(); //Start the Timer
        }

        private void dispatcherTimer_Tick(object sender, EventArgs e)
        {
            if (AddItem)
            {
                AddItem = false;
                AddToScrollViewer();
            }
        }
    }
}

^Window2.xaml

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for Window2.xaml
    /// </summary>
    public partial class Window2 : Window
    {
        public Window2()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            Window1.AddItem = true;
        }
    }
}

---

Thanks,

I hope you find this helpful 🙂