aistudio-wpf-diagram/AIStudio.Wpf.DiagramDesigner.Test/ViewModels/MainWindowViewModel.cs

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

namespace AIStudio.Wpf.DiagramDesigner.Test.ViewModels
{
    class MainWindowViewModel : BindableBase
    {
        public ToolBoxViewModel ToolBoxViewModel
        {
            get; private set;
        }

        public DiagramViewModel DiagramViewModel
        {
            get; private set;
        }

        protected IDiagramServiceProvider _service
        {
            get
            {
                return DiagramServicesProvider.Instance.Provider;
            }
        }

        public SelectableDesignerItemViewModelBase SelectedItem
        {
            get
            {
                return DiagramViewModel.SelectedItems?.FirstOrDefault();
            }
        }

        public MainWindowViewModel()
        {
            ToolBoxViewModel = new ToolBoxViewModel();
            DiagramViewModel = new DiagramViewModel();
            DiagramViewModel.ShowGrid = true;
            DiagramViewModel.GridCellSize = new Size(100, 60);
            DiagramViewModel.GridMargin = 0d;
            DiagramViewModel.CellHorizontalAlignment = CellHorizontalAlignment.Center;
            DiagramViewModel.CellVerticalAlignment = CellVerticalAlignment.Center;
            DiagramViewModel.PageSizeType = PageSizeType.Custom;
            DiagramViewModel.PageSize = new Size(double.NaN, double.NaN);

            _service.DrawModeViewModel.VectorLineDrawMode = DrawMode.BoundaryConnectingLine;
            DiagramViewModel.PropertyChanged += DiagramViewModel_PropertyChanged;
        }

        private void DiagramViewModel_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            if (e.PropertyName == "IsSelected")
            {
                RaisePropertyChanged(nameof(SelectedItem));
            }
        }
    }
    
}