private void OnLoaded(object sender, RoutedEventArgs e)
{
var scrollViewer = AssociatedObject.FindVisualChildrenBreadthFirstOrSelf <ScrollViewer>().FirstOrDefault();
if (scrollViewer is null)
{
throw new InvalidOperationException("ScrollViewer not found.");
}
else
{
if (scrollViewer.VerticalScrollBarVisibility == ScrollBarVisibility.Visible || scrollViewer.VerticalScrollBarVisibility == ScrollBarVisibility.Auto)
{
var propertyDescriptor = System.ComponentModel.DependencyPropertyDescriptor.FromProperty(ScrollViewer.VerticalOffsetProperty, typeof(ScrollViewer));
propertyDescriptor?.RemoveValueChanged(scrollViewer, OnVerticalOffsetChanged);
propertyDescriptor?.AddValueChanged(scrollViewer, OnVerticalOffsetChanged);
void OnVerticalOffsetChanged(object?sender, EventArgs args)
{
var atBottom = scrollViewer.VerticalOffset >= scrollViewer.ScrollableHeight;
if (atBottom)
{
CommandExecutionRequested?.Invoke(scrollViewer, EventArgs.Empty);
}
}
}
if (scrollViewer.HorizontalScrollBarVisibility == ScrollBarVisibility.Visible || scrollViewer.VerticalScrollBarVisibility == ScrollBarVisibility.Auto)
{
var propertyDescriptor = System.ComponentModel.DependencyPropertyDescriptor.FromProperty(ScrollViewer.HorizontalOffsetProperty, typeof(ScrollViewer));
propertyDescriptor?.RemoveValueChanged(scrollViewer, OnHorizontalOffsetChanged);
propertyDescriptor?.AddValueChanged(scrollViewer, OnHorizontalOffsetChanged);
void OnHorizontalOffsetChanged(object?sender, EventArgs args)
{
var atBottom = scrollViewer.HorizontalOffset >= scrollViewer.ScrollableWidth;
if (atBottom)
{
CommandExecutionRequested?.Invoke(scrollViewer, EventArgs.Empty);
}
}
}
}
}
public ICommandResult ExecuteCommand(IPlugin caller, string commandTag, params string[] args) => CommandExecutionRequested?.Invoke(caller, commandTag, args);