4C/Gumming/Modules/Print/DraggableField.cs

using GummingCommon;
using System;
using System.IO;
using System.Reflection;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using static GummingCommon.AppEnum;

namespace Gumming
{    
    /// <summary>
    /// Image control which can be dragged and resized at runtime
    /// </summary>
    public class DraggableField : Border, IDraggableBase
    {
        #region Events

        public event DraggableImageDragHandler Drag;
        public event DraggableImageResizeHandler Resize;

        #endregion

        #region Member Variables
        private Point _previousLocation;
        //private Transform _previousTransform;
        private Point _imagePosition;
        private Point _imageSize;
        private UIElement _container;
        private bool _doubleConfirm;
        private TextBlock _TextArea;
        public TextBlock TextArea
        {
            get
            {
                return _TextArea;
            }
            set
            {
                _TextArea = value;
            }
        }
       
        public PrintControlType ControlType { get; set; }
        /// <summary>
        /// ControlField
        /// </summary>
        public string ControlField { get; set; }
        /// <summary>
        /// ControlFormat
        /// </summary>
        public string ControlFormat
        {
            get
            {
                return TextArea.Text;
            }
            set
            {
                TextArea.Text = value;
            }
        }
        #endregion

        #region Constructors

        /// <summary>
        /// Static constructor
        /// </summary>
        static DraggableField()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(DraggableField), new FrameworkPropertyMetadata(typeof(Border)));
        }

        /// <summary>
        /// Default constructor
        /// </summary>
        public DraggableField(UIElement container, string controltype = null, string field = null, string format = null)
        {
            TextArea = new TextBlock();
            TextArea.VerticalAlignment = VerticalAlignment.Top;
            TextArea.HorizontalAlignment = HorizontalAlignment.Left;
            this.Child = TextArea;
            ControlType = (PrintControlType)Enum.Parse(typeof(PrintControlType), controltype);
            ControlField = field;
            ControlFormat = format;
            this.MinHeight = 20;
            this.MinWidth = 20;
            _container = container;
            this.Background = new SolidColorBrush(Colors.White);
        }

        public void SetFont(string font = null, decimal? fontsize = null, string fontstyle = null)
        {
            if (fontsize != null)
            {
                TextArea.FontSize = (double)fontsize;
                TextArea.FontFamily = new FontFamily(font);

                var propertyInfo = typeof(FontWeights).GetProperty(fontstyle,
                                                  BindingFlags.Static |
                                                  BindingFlags.Public |
                                                  BindingFlags.IgnoreCase);
                TextArea.FontWeight = (FontWeight)propertyInfo.GetValue(null, null);
            }
        }
        #endregion

        #region Methods

        protected void OnDrag(DraggableImageDragEventArgs e)
        {
            DraggableImageDragHandler handler = Drag;
            if (handler != null) handler(this, e);
        }

        protected void OnResize(DraggableImageResizeEventArgs e)
        {
            DraggableImageResizeHandler handler = Resize;
            if (handler != null) handler(this, e);
        }

        #endregion

        #region Overrides

        protected override void OnMouseEnter(MouseEventArgs e)
        {
            if (e.LeftButton == MouseButtonState.Pressed)
            {
                this.CaptureMouse();
            }

            base.OnMouseEnter(e);
        }

        protected override void OnMouseLeave(MouseEventArgs e)
        {
            this.ReleaseMouseCapture();
            base.OnMouseLeave(e);
        }

        protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
        {
            this.ReleaseMouseCapture();
            base.OnMouseLeftButtonUp(e);
            this.Cursor = Cursors.Arrow;
            _doubleConfirm = false;
        }

        protected override void OnPreviewMouseDown(MouseButtonEventArgs e)
        {
            this.CaptureMouse();
            base.OnPreviewMouseDown(e);
            Point currentLocation = e.MouseDevice.GetPosition(_container);
            _previousLocation = currentLocation;
            _imagePosition.X = (double)this.GetValue(Canvas.LeftProperty);
            _imagePosition.Y = (double)this.GetValue(Canvas.TopProperty);
            double width = !double.IsNaN(this.ActualWidth) ? this.ActualWidth : this.Width;
            double height = !double.IsNaN(this.ActualHeight) ? this.ActualHeight : this.Height;
            _imageSize.X = width;
            _imageSize.Y = height;
            
            //_previousTransform = this.RenderTransform;
            Point locaion = e.MouseDevice.GetPosition(this);
            bool stretchRight = (locaion.X >= width - 3) ? true : false;
            bool stretchBottom = (locaion.Y >= height - 3) ? true : false;
            //set cursor to show stretch direction 
            if (stretchRight && stretchBottom)
            {
                this.Cursor = Cursors.SizeNWSE;
            }
            else if (stretchRight)
            {
                this.Cursor = Cursors.SizeWE;
            }
            else if (stretchBottom)
            {
                this.Cursor = Cursors.SizeNS;
            }
            else
            {
                this.Cursor = Cursors.Hand;
            }
            _doubleConfirm = true;
        }

        protected override void OnMouseMove(MouseEventArgs e)
        {            
            Point currentLocation = e.MouseDevice.GetPosition(_container);

            //var move = new TranslateTransform(
            //        currentLocation.X - _previousLocation.X, currentLocation.Y - _previousLocation.Y);

            double width = !double.IsNaN(this.ActualWidth) ? this.ActualWidth : this.Width;
            double height = !double.IsNaN(this.ActualHeight) ? this.ActualHeight : this.Height;

            if (e.LeftButton == MouseButtonState.Pressed && _doubleConfirm)
            {
                if (this.Cursor == Cursors.Hand)
                {
                    /*
                    var group = new TransformGroup();
                    if (_previousTransform != null)
                    {
                        group.Children.Add(_previousTransform);
                    }
                    group.Children.Add(move);

                    this.RenderTransform = group;
                     * */
                    double chnageX = currentLocation.X - _previousLocation.X;
                    double chnageY = currentLocation.Y - _previousLocation.Y;

                    this.SetValue(Canvas.LeftProperty, _imagePosition.X + chnageX);
                    this.SetValue(Canvas.TopProperty, _imagePosition.Y + chnageY);

                    // Invoke drag event
                    OnDrag(new DraggableImageDragEventArgs(currentLocation, _previousLocation, chnageX, chnageY));
                }
                else if (this.Cursor == Cursors.SizeNWSE)
                {
                    double chnageX = currentLocation.X - _previousLocation.X;
                    double chnageY = currentLocation.Y - _previousLocation.Y;
                    this.Width = _imageSize.X + chnageX < 1 ? 10 : _imageSize.X + chnageX;
                    this.Height = _imageSize.Y + chnageY < 1 ? 10 : _imageSize.Y + chnageY;
                }
                else if (this.Cursor == Cursors.SizeWE)
                {
                    double chnageX = currentLocation.X - _previousLocation.X;
                    this.Width = _imageSize.X + chnageX < 1 ? 10 : _imageSize.X + chnageX;
                }
                else if (this.Cursor == Cursors.SizeNS)
                {
                    double chnageY = currentLocation.Y - _previousLocation.Y;
                    this.Height = _imageSize.Y + chnageY < 1 ? 10 : _imageSize.Y + chnageY;
                }
            }
            else
            {
                this.Cursor = Cursors.Arrow;              
                Point locaion = e.MouseDevice.GetPosition(this); 
                bool stretchRight = (locaion.X >= width - 3) ? true : false;
                bool stretchBottom = (locaion.Y >= height - 3) ? true : false;
                //set cursor to show stretch direction 
                if (stretchRight && stretchBottom)
                {
                    this.Cursor = Cursors.SizeNWSE;
                }
                else if (stretchRight)
                {
                    this.Cursor = Cursors.SizeWE;
                }
                else if (stretchBottom)
                {
                    this.Cursor = Cursors.SizeNS;
                }
                else
                {
                    this.Cursor = Cursors.Hand;
                }
            }

            base.OnMouseMove(e);
        }

        public override string ToString()
        {
            string details = string.Empty;

            double width = !double.IsNaN(this.ActualWidth) ? this.ActualWidth : this.Width;
            double height = !double.IsNaN(this.ActualHeight) ? this.ActualHeight : this.Height;

            if (this.Cursor == Cursors.Hand)
            {
                Window wnd = Window.GetWindow(this);
                Point location = this.TranslatePoint(new Point(0, 0), wnd);

                details = " : X = " + location.X + ", Y = " + location.Y;
            }
            else if (this.Cursor == Cursors.SizeWE)
            {
                details = " : Width2 = " + width;
            }
            else if (this.Cursor == Cursors.SizeNS)
            {
                details = " : Height2 = " + height;
            }

            return this.Name + details;
        }

        #endregion
    }    
}