In WPF, how can I determine whether a control is visible to the user?

by

You can use this little helper function I just wrote that will check if an element is visible for the user, in a given container. The function returns true if the element is partly visible. If you want to check if it’s fully visible, replace the last line by rect.Contains(bounds).

private bool IsUserVisible(FrameworkElement element, FrameworkElement container)
{
    if (!element.IsVisible)
        return false;

    Rect bounds = element.TransformToAncestor(container).TransformBounds(new Rect(0.0, 0.0, element.ActualWidth, element.ActualHeight));
    Rect rect = new Rect(0.0, 0.0, container.ActualWidth, container.ActualHeight);
    return rect.Contains(bounds.TopLeft) || rect.Contains(bounds.BottomRight);
}

In your case, element will be your user control, and container your Window.

More Related Contents:

  1. How to implement Balloon message in a WPF application
  2. How can I add a hint text to WPF textbox?
  3. How do I invert BooleanToVisibilityConverter?
  4. WPF: How to make canvas auto-resize?
  5. How to create/make rounded corner buttons in WPF?
  6. Can/Does WPF have multiple GUI threads?
  7. Dragging an image in WPF
  8. What is The difference between ListBox and ListView
  9. Create guitar chords editor in WPF (from RichTextBox?)
  10. Image UriSource and Data Binding
  11. Apply stroke to a textblock in WPF
  12. How can I read/write app.config settings at runtime without using user settings?
  13. Enumerating .NET assembly resources at runtime
  14. WPF – How to force a Command to re-evaluate ‘CanExecute’ via its CommandBindings
  15. How to set and change the culture in WPF
  16. Lazy loading WPF tab content
  17. Going fullscreen on secondary monitor
  18. What does “{x:Static}” mean in XAML?
  19. DataGridTextColumn.IsReadOnly seems to be faulty
  20. WPF TextBox won’t fill in StackPanel
  21. How do You Create a Read-Only Dependency Property?
  22. Binding in a WPF data grid text column
  23. Is there a WPF Cheat Sheet available? [closed]
  24. How to test a WPF user interface?
  25. Standard Windows menu bars in Windows Forms
  26. How to begin WPF development?
  27. Difference between TargetType=”controlType” and TargetType=”{x:Type controlType}”
  28. Using a custom WPF control in WinForms
  29. WPF – How can I center all items in a WrapPanel?
  30. Get the item doubleclick event of listview

Leave a Comment