3rdpartylibs/fastreports.wpf/FastReport/Map/MapObject.PreviewExt.cs

using System;
using System.Drawing;
using System.Windows.Forms;

namespace FastReport.Map
{
    partial class MapObject
    {
        #region Fields
        private bool isPanning;
        private bool panned;
        private Point lastMousePoint;
        private bool needPreviewPageModify;
        private ShapeBase hotPoint;
        #endregion // Fields

        #region Properties
        internal ShapeBase HotPoint
        {
            get { return hotPoint; }
            set
            {
                if (hotPoint != value)
                    Page.Refresh();
                hotPoint = value;
            }
        }
        #endregion

        #region Preview mouse support
        /// <inheritdoc/>
        public override void OnMouseDown(MouseEventArgs e)
        {
            base.OnMouseDown(e);
            lastMousePoint = e.Location;
            isPanning = true;
            panned = false;
        }

        /// <inheritdoc/>
        public override void OnMouseMove(MouseEventArgs e)
        {
            base.OnMouseMove(e);
            if (!IsEmpty)
            {
                if (isPanning)
                {
                    int deltaX = e.X - lastMousePoint.X;
                    int deltaY = e.Y - lastMousePoint.Y;
                    if (Math.Abs(deltaX) > 3 || Math.Abs(deltaY) > 3)
                    {
                        OffsetX += deltaX / Zoom;
                        OffsetY += deltaY / Zoom;
                        panned = true;
                        lastMousePoint = e.Location;
                        needPreviewPageModify = true;
                        Page.Refresh();
                    }
                }
                else
                {
                    if (Hyperlink.Kind == HyperlinkKind.DetailPage || Hyperlink.Kind == HyperlinkKind.DetailReport)
                    {
                        foreach (MapLayer layer in Layers)
                        {
                            ShapeBase shape = layer.HitTest(new PointF(e.X + AbsLeft, e.Y + AbsTop));
                            if (shape != null && !shape.IsValueEmpty)
                            {
                                HotPoint = shape;
                                Hyperlink.Value = HotPoint.SpatialValue;
                                Cursor = Cursors.Hand;
                                return;
                            }
                        }

                        HotPoint = null;
                        Hyperlink.Value = "";
                        Cursor = Cursors.Default;
                    }
                }
            }
        }

        /// <inheritdoc/>
        public override void OnMouseUp(MouseEventArgs e)
        {
            base.OnMouseUp(e);
            // prevent hyperlink invoke while panning
            if (panned)
                Hyperlink.Value = "";
            isPanning = false;
            panned = false;
        }

        /// <inheritdoc/>
        public override void OnMouseWheel(MouseEventArgs e)
        {
            base.OnMouseWheel(e);
            if (e.Delta < 0)
                ZoomOut();
            else
                ZoomIn();
            needPreviewPageModify = true;
        }

        /// <inheritdoc/>
        public override void OnMouseEnter(EventArgs e)
        {
            base.OnMouseEnter(e);
            needPreviewPageModify = false;
        }

        /// <inheritdoc/>
        public override void OnMouseLeave(EventArgs e)
        {
            base.OnMouseLeave(e);
            HotPoint = null;
            if (needPreviewPageModify)
                Page.Modify();
        }
        #endregion
    }
}