ScreenToGif/Controls/AdornerControl.cs

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using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using ScreenToGif.Util;

namespace ScreenToGif.Controls
{
    /// <summary>
    /// A content control that allows an adorner for the content to
    /// be defined in XAML.
    /// </summary>
    public class AdornedControl : ContentControl
    {
        #region Dependency Properties

        public static readonly DependencyProperty IsAdornerVisibleProperty = DependencyProperty.Register("IsAdornerVisible", typeof(bool), typeof(AdornedControl),
                new FrameworkPropertyMetadata(IsAdornerVisible_PropertyChanged));

        public static readonly DependencyProperty AdornerContentProperty = DependencyProperty.Register("AdornerContent", typeof(FrameworkElement), typeof(AdornedControl),
                new FrameworkPropertyMetadata(AdornerContent_PropertyChanged));

        public static readonly DependencyProperty HorizontalAdornerPlacementProperty = DependencyProperty.Register("HorizontalAdornerPlacement", typeof(AdornerPlacement), typeof(AdornedControl),
                new FrameworkPropertyMetadata(AdornerPlacement.Inside));

        public static readonly DependencyProperty VerticalAdornerPlacementProperty = DependencyProperty.Register("VerticalAdornerPlacement", typeof(AdornerPlacement), typeof(AdornedControl),
                new FrameworkPropertyMetadata(AdornerPlacement.Inside));

        public static readonly DependencyProperty AdornerOffsetXProperty = DependencyProperty.Register("AdornerOffsetX", typeof(double), typeof(AdornedControl));

        public static readonly DependencyProperty AdornerOffsetYProperty = DependencyProperty.Register("AdornerOffsetY", typeof(double), typeof(AdornedControl));

        #endregion Dependency Properties

        #region Commands

        public static readonly RoutedCommand ShowAdornerCommand = new RoutedCommand("ShowAdorner", typeof(AdornedControl));

        public static readonly RoutedCommand HideAdornerCommand = new RoutedCommand("HideAdorner", typeof(AdornedControl));

        #endregion Commands

        static AdornedControl()
        {
            CommandManager.RegisterClassCommandBinding(typeof(AdornedControl), ShowAdornerCommandBinding);
            CommandManager.RegisterClassCommandBinding(typeof(AdornedControl), HideAdornerCommandBinding);
        }

        public AdornedControl()
        {
            Focusable = false; // By default don't want 'AdornedControl' to be focusable.

            DataContextChanged += AdornedControl_DataContextChanged;
        }

        /// <summary>
        /// Event raised when the DataContext of the adorned control changes.
        /// </summary>
        private void AdornedControl_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
        {