【原创】C#WINFORM工作流程图 GDI+轻量级流程图设计器

整体界面展示

 右侧导航说明

流程图操作

根据左侧工具箱进行节点拖入，如下图

 拖入部分代码

 private void pictureBox1_DragEnter(object sender, DragEventArgs e)
        {
            if ((e.Data.GetDataPresent(typeof(Button))))
            {
                e.Effect = DragDropEffects.Copy;
            }
        }
        private void pictureBox1_DragDrop(object sender, DragEventArgs e)
        {
            if ((e.Data.GetDataPresent(typeof(Button))))
            {
                Button btnInstance = new Button();
                FieldInfo info, info2, info3;
                object obj, obj2, obj3;
                info = e.Data.GetType().GetField("innerData", BindingFlags.NonPublic | BindingFlags.Instance);
                obj = info.GetValue(e.Data);
                info2 = obj.GetType().GetField("data", BindingFlags.NonPublic | BindingFlags.Instance);
                obj2 = info2.GetValue(obj);
                System.Collections.Hashtable dataItems = (obj2 as System.Collections.Hashtable);
                foreach (var dataItem in dataItems)
                {
                    System.Collections.DictionaryEntry dictEntry = (System.Collections.DictionaryEntry)dataItem;
                    object key = dictEntry.Key;
                    object value = dictEntry.Value;
                    info3 = value.GetType().GetField("data", BindingFlags.Public | BindingFlags.Instance);
                    obj3 = info3.GetValue(value);
                    btnInstance = obj3 as Button; // 此处转化成功，成功获取到传递进来的button实例。
                }
                try
                {
                    Button bt = new Button();
                    bt.ImageAlign = ContentAlignment.MiddleLeft;
                    bt.TextAlign = ContentAlignment.MiddleRight;
                    bt.ImageList = imageList1;
                    bt.ImageIndex = int.Parse(btnInstance.Tag.ToString());
                    bt.AutoSize = false;
                    bt.Location = this.PointToClient(new Point(e.X-124, e.Y-48/2));
                    bt.Size = new Size(136, 48);
                    bt.ForeColor = Color.Black;
                    bt.Text = btnInstance.Text;
                    bt.Name = btnInstance.Name;
                    bt.BackColor = Color.Transparent;
                    // 在控件增加到窗体里时做一个判断，如果是开始 和结束只能存在一个
                    foreach (Control control in this.pictureBox1.Controls)
                    {
                        if (control.Name == btnInstance.Name || control.Name == btnInstance.Name)
                        {
                            MessageBox.Show("已存在，不能添加");
                            return;
                        }
                    }
                    pictureBox1.Controls.Add(bt);
                    //拖拽移动
                    MoveBlock(bt);
                    bt.ContextMenuStrip = this.contextMenuStrip1;
                    bt.Click += new System.EventHandler(bt_click);
                    huoqu_kongjian();
                    bt.BringToFront();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
        }

        Image ImgDeal(Image img, byte alpha, int width, int height)
        {
            var bmpSize = new Bitmap(width, height);
            using (var g = Graphics.FromImage(bmpSize))
            {
                g.DrawImage(img, new Rectangle(0, 0, width, height));
            }
            var bmpAlpha = new Bitmap(width, height);
            for (int i = 0; i < width; i++)
            {
                for (int j = 0; j < height; j++)
                {
                    var color = bmpSize.GetPixel(i, j);
                    bmpAlpha.SetPixel(i, j, Color.FromArgb(alpha, color));
                }
            }
            return (Image)bmpAlpha.Clone();
        }

    // 定义按钮拖动 轨迹的样式
        private void bt_GiveFeedback(object sender, GiveFeedbackEventArgs e)
        {
            e.UseDefaultCursors = false;
            if (e.Effect == DragDropEffects.None)
            {
                //var img = ImgDeal(imageList1.Images[1], 70, 136,48);
                //Cursor.Current = new Cursor(((Bitmap)img).GetHicon());
            }
            else
            {
                var img = ImgDeal(imageList1.Images[1], 70, 136, 48);
                Cursor.Current = new Cursor(((Bitmap)img).GetHicon());
            }
        }

支持鼠标经过 连接线变色且支持右键删除连线

删除

右键节点支持删除和属性设置

右键属性

 属性设置的部分代码

            try
            {

                c_bt.AutoSize = btn.AutoSize;
                c_bt.Top = btn.Location.Y;
                c_bt.Left = btn.Location.X;
                c_bt.Width = btn.Width;
                c_bt.Height = btn.Height;
                c_bt.BackColor = btn.BackColor;
                //c_bt.BorderStyle = ((Button)this.panel1.Controls.Find(bt.Name, true)[0]).BorderStyle;
                c_bt.ForeColor = btn.ForeColor;
                c_bt.Font = btn.Font;
                c_bt.Text = btn.Text;
                c_bt.TextAlign = btn.TextAlign;
                propertyGrid1.SelectedObject = c_bt;

            }
            catch { }