ScreenToGif/Controls/GhostWindow.cs

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using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;

namespace ScreenToGif.Controls
{
    public class GhostWindow : Window
    {
        private AdornerLayer _adornerLayer;
        private Border _mainBorder;
        private Canvas _mainCanvas;
        private ImageButton _selectButton;
        private Point _latestPosition;

        #region Dependency Properties

        public static readonly DependencyProperty IsPickingRegionProperty = DependencyProperty.Register("IsPickingRegion", typeof(bool), typeof(GhostWindow),
            new PropertyMetadata(false));

        public static readonly DependencyProperty IsRecordingProperty = DependencyProperty.Register("IsRecording", typeof(bool), typeof(GhostWindow),
            new PropertyMetadata(false));

        public static readonly DependencyProperty IsDraggingProperty = DependencyProperty.Register("IsDragging", typeof(bool), typeof(GhostWindow),
            new PropertyMetadata(false));

        public static readonly DependencyProperty RegionProperty = DependencyProperty.Register("Region", typeof(Rect), typeof(GhostWindow),
            new PropertyMetadata(Rect.Empty));

        #endregion

        #region Properties

        public bool IsPickingRegion
        {
            get { return (bool)GetValue(IsPickingRegionProperty); }
            set { SetValue(IsPickingRegionProperty, value); }
        }

        public bool IsRecording
        {
            get { return (bool)GetValue(IsRecordingProperty); }
            set { SetValue(IsRecordingProperty, value); }
        }

        public bool IsDragging
        {
            get { return (bool)GetValue(IsDraggingProperty); }
            set { SetValue(IsDraggingProperty, value); }
        }

        public Rect Region
        {
            get { return (Rect)GetValue(RegionProperty); }
            set { SetValue(RegionProperty, value); }
        }

        private CroppingAdorner _cropAdorner;