ScreenToGif/Controls/DragScrollGrid.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;

namespace ScreenToGif.Controls
{
    /// <summary>
    /// Scroll by Drag Grid
    /// TODO: Make a grid that reacts to the drag sideway to increase or decrease a number.
    /// </summary>
    public class DragScrollGrid : Grid
    {
        #region Variables

        private Point _lastPosition;

        public static readonly DependencyProperty IsDraggableProperty;

        #endregion

        #region Properties

        /// <summary>
        /// If true, will enable te value increase/decrease by sideway drag.
        /// </summary>
        public bool IsDraggable
        {
            get { return (bool)GetValue(IsDraggableProperty); }
            set { SetValue(IsDraggableProperty, value); }
        }

        #endregion

        static DragScrollGrid()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(DragScrollGrid), new FrameworkPropertyMetadata(typeof(DragScrollGrid)));

            IsDraggableProperty = DependencyProperty.Register("IsDraggable", typeof(bool), typeof(DragScrollGrid), new PropertyMetadata(false));
        }

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();

            MouseDown += DragScrollGrid_MouseDown;
            MouseMove += DragScrollGrid_MouseMove;
            MouseUp += DragScrollGrid_MouseUp;
        }

        #region Events

        private void DragScrollGrid_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            Mouse.Capture(this);