aistudio-wpf-diagram/Demos/AIStudio.Wpf.DiagramDesigner.Demo/ViewModels/Groups/CustomDefinedGroupViewModel.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;

namespace AIStudio.Wpf.DiagramDesigner.Demo.ViewModels.Groups
{
    class CustomDefinedGroupViewModel : BaseViewModel
    {
        public CustomDefinedGroupViewModel()
        {
            Title = "Grouping";
            Info = "You can (un)group nodes using CTRL+G.<br>" +
                    "Currently, the library doesn't handle nested groups yet nor ports.";

            DiagramViewModel = new DiagramViewModel();
            DiagramViewModel.PageSizeType = PageSizeType.Custom;
            DiagramViewModel.PageSize = new Size(double.NaN, double.NaN);
            DiagramViewModel.ColorViewModel = new ColorViewModel();
            DiagramViewModel.ColorViewModel.FillColor.Color = System.Windows.Media.Colors.Orange;

            DefaultDesignerItemViewModel node1 = new DefaultDesignerItemViewModel(DiagramViewModel) { Left = 50, Top = 50, Text = "1" };
            DiagramViewModel.Add(node1);

            DefaultDesignerItemViewModel node2 = new DefaultDesignerItemViewModel(DiagramViewModel) { Left = 300, Top = 300, Text = "2" };
            DiagramViewModel.Add(node2);

            DefaultDesignerItemViewModel node3 = new DefaultDesignerItemViewModel(DiagramViewModel) { Left = 300, Top = 50, Text = "3" };
            DiagramViewModel.Add(node3);

            ConnectionViewModel connector1 = new ConnectionViewModel(DiagramViewModel, node1.RightConnector, node2.LeftConnector, DrawMode.ConnectingLineSmooth, RouterMode.RouterNormal);
            DiagramViewModel.Add(connector1);

            ConnectionViewModel connector2 = new ConnectionViewModel(DiagramViewModel, node2.RightConnector, node3.RightConnector, DrawMode.ConnectingLineStraight, RouterMode.RouterOrthogonal);
            DiagramViewModel.Add(connector2);

            //Custom 需要设置为True，表示外面自定义的Group替换默认的。
            CustomDefinedGroupDesignerItemViewModel group = new CustomDefinedGroupDesignerItemViewModel() { Describe = "This is a custom group"};
            group.FontViewModel.FontColor = System.Windows.Media.Colors.Orange;
            DiagramViewModel.GroupCommand.Execute(new List<DesignerItemViewModelBase> { group, node1, node2 });
        }
    }
}