Metis_xctg/Annotation/Other/PanTool.cs

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

namespace PaintDotNet.Annotation.Other
{
    /// <summary>
    /// 平移工具(手型)
    /// </summary>
    public class PanTool : Tool
    {
        private static Cursor cursorMouseDown = new Cursor(PdnResources.GetResourceStream("Cursors.PanToolCursorMouseDown.cur"));
        private static Cursor cursorMouseUp = new Cursor(PdnResources.GetResourceStream("Cursors.PanToolCursor.cur"));
        private static bool tracking = false;
        private static Point lastMouseXY;
        private static int ignoreMouseMove = 0;
        private static ISurfaceBox surfaceBox;

        private static bool CanPan()
        {
            if (surfaceBox.GetVisibleDocumentRectangleF().Size == surfaceBox.GetDocumentSize())
            {
                return false;
            }
            else
            {
                return true;
            }
        }

        public static void OnMouseDown(ISurfaceBox drawArea, MouseEventArgs e)
        {
            surfaceBox = drawArea;
            lastMouseXY = new Point(e.X, e.Y);
            tracking = true;

            if (CanPan())
            {
                drawArea.Cursor = cursorMouseDown;
            }
            else
            {
                drawArea.Cursor = null;
            }
        }

        public static void OnMouseMove(ISurfaceBox drawArea, MouseEventArgs e)
        {
            surfaceBox = drawArea;

            if (ignoreMouseMove > 0)
            {
                --ignoreMouseMove;
            }
            else if (tracking)
            {
                Point mouseXY = new Point(e.X, e.Y);
                Size delta = new Size(mouseXY.X - lastMouseXY.X, mouseXY.Y - lastMouseXY.Y);
                if (delta.Width != 0 || delta.Height != 0)
                {
                    PointF scrollPos = drawArea.GetDocumentScrollPositionF();
                    PointF newScrollPos = new PointF(scrollPos.X - delta.Width, scrollPos.Y - delta.Height);
                    ++ignoreMouseMove;
                    drawArea.SetDocumentScrollPositionF(newScrollPos);
                    lastMouseXY = mouseXY;
                }
            }
            else
            {
                if (CanPan())
                {
                    drawArea.Cursor = cursorMouseUp;
                }
                else
                {
                    drawArea.Cursor = null;
                }
            }
        }

        public static void OnMouseUp(ISurfaceBox drawArea, MouseEventArgs e)
        {
            surfaceBox = drawArea;

            if (CanPan())
            {
                drawArea.Cursor = cursorMouseUp;
            }
            else
            {
                drawArea.Cursor = null;
            }

            tracking = false;
        }

        public static void OnMouseClick(ISurfaceBox drawArea, MouseEventArgs e)
        {

        }

        /// <summary>
        /// 鼠标左键双击
        /// </summary>
        /// <param name="drawArea"></param>
        /// <param name="e"></param>
        public static void OnMouseLeftDoubleClick(ISurfaceBox surfacebox, MouseEventArgs e)
        {

        }

        /// <summary>
        /// 删除按键
        /// </summary>
        /// <param name="surfacebox"></param>
        /// <param name="e"></param>
        public static void OnDelKeyDown(ISurfaceBox surfacebox, MouseEventArgs e)
        {

        }

        /// <summary>
        /// 删除划痕处理&污迹处理选择区域的痕迹
        /// </summary>
        /// <param name="surfacebox"></param>
        /// <param name="e"></param>
        public static void OnDel2KeyDown(ISurfaceBox surfacebox, MouseEventArgs e)
        {

        }

        /// <summary>
        /// 清空全部时调用该方法，将可能未绘制完的对象清空
        /// </summary>
        public static void beginWithNewObject()
        {
            
        }
    }
}