kev/Drawer/Module/GeoSigmaViewer/DrawToolDelete.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Drawing;

namespace GeoSigmaViewer
{
    public class DrawToolDelete : DrawTool
    {
        private MouseMoveResult mmResult;
        public DrawToolDelete()
        {
            ToolCursor = DrawCursors.Delete;
            ItemType = DrawItemType.ITEM_DELETE;
            mmResult = new MouseMoveResult();
        }
        public override void Start()
        {
            drawer.Cursor = ToolCursor;
            drawer.Geo.Delete_SetType(0);
        }

        public override void OnMouseClick(Drawer drawArea, MouseEventArgs e)
        {
            base.OnMouseClick(drawArea, e);
        }

        public override void OnLButtonDown(Drawer drawArea, MouseEventArgs e)
        {
            drawArea.Geo.Delete_ClearCountSelected();
            drawArea.Geo.OnLButtonDown(e.X, e.Y);
        }

        public override void OnMouseMove(Drawer drawArea, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                Graphics g = drawArea.CreateGraphics();
                drawArea.Geo.ItemMouseMove(g.GetHdc(), e.X, e.Y, ref mmResult);
            }
        }

        public override void OnLButtonUp(Drawer drawArea, MouseEventArgs e)
        {
            drawArea.Geo.OnLButtonUp(e.X, e.Y);
            drawArea.Geo.EnableRedraw(true);
            drawArea.ReDraw();

            if (drawArea.Geo.Delete_GetCountSelected() <= 0)
            {
                MessageBox.Show("未选中图元？", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
        }
    }
}