Question

I have a listview

 <ListView Name="listView2">
        <ListView.View>
            <GridView>
                <!-- First Column -->
                <GridViewColumn Width="105" Header="ID">
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>              
                            <StackPanel>    
                                      <!-- here is the event xID_Loaded -->    
                                <TextBox Loaded="xID_Loaded" Text="{Binding ID}"></TextBox>
                                <Popup Height="Auto"  Width="100" IsOpen="True" >
                                    <ListView Margin="2">
                                    </ListView>
                                </Popup>
                            </StackPanel>
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>

                <!-- Second Column -->
                <GridViewColumn Width="185" Header="Description">
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <TextBox Text="{Binding Description}" ></TextBox>
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>
               etc...

Anyways that listview is binded to an observable collection. I use the Loaded=”xID_Loaded” event on the column to initialize the popup control everytime I add a new row to the listview.

Therefore In my code behind I have:

private void xID_Loaded(object sender, RoutedEventArgs e)
{
    // sender is the textbox

    // I can get the popup relative to the sender
    var stackPanel = (StackPanel)(((Control)sender).Parent);
    var popup = return (Popup)sp.Children[1];

    // every time window moves I want to reset the location
    // of the popu by doing:
    this.LocationChanged += (a, b) =>
    {
        popup.IsOpen = false;   // this will ensure that the popup moves with the control
        popup.IsOpen = true;
    };

   // some more code to initialice the popup
   // ...

---

Now I want to have a method called ResetAllPopups() where that method will reset all popups. in case someone scrolls or for watever reason I want to reset all popus.

I know I will be able to solve this problem by:

iterating through the listviewitems in the listview finding the popup control with VisualTreeHelper then reset each popup that is found.

I think it will be nicer if I could find all the events that are subscribed to this.LocationChanged event handler. How can I execute all the events that are subsribed to the this.LocationChanged event just as if I where to change the location of the window?

Answer 1

You think too UI-centric, just bind the IsOpen to your items, then iterate over them, no need to get a Popup instance.