#region License Information /* HeuristicLab * Copyright (C) Heuristic and Evolutionary Algorithms Laboratory (HEAL) * * This file is part of HeuristicLab. * * HeuristicLab is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * HeuristicLab is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with HeuristicLab. If not, see . */ #endregion using System.Collections; using System.Windows.Forms; using HeuristicLab.MainForm; namespace HeuristicLab.Core.Views { [View("ItemSet View")] [Content(typeof(ItemSet<>), true)] [Content(typeof(IItemSet<>), false)] [Content(typeof(ReadOnlyItemSet<>), true)] public partial class ItemSetView : ItemCollectionView where T : class, IItem { protected bool draggedItemsAlreadyContained; public new IItemSet Content { get { return (IItemSet)base.Content; } set { base.Content = value; } } public ItemSetView() { InitializeComponent(); } protected override void itemsListView_DragEnter(object sender, DragEventArgs e) { base.itemsListView_DragEnter(sender, e); draggedItemsAlreadyContained = false; if (validDragOperation) { if (e.Data.GetData(HeuristicLab.Common.Constants.DragDropDataFormat) is T) { draggedItemsAlreadyContained = Content.Contains((T)e.Data.GetData(HeuristicLab.Common.Constants.DragDropDataFormat)); } else if (e.Data.GetData(HeuristicLab.Common.Constants.DragDropDataFormat) is IEnumerable) { IEnumerable items = (IEnumerable)e.Data.GetData(HeuristicLab.Common.Constants.DragDropDataFormat); foreach (object item in items) draggedItemsAlreadyContained = draggedItemsAlreadyContained || Content.Contains((T)item); } } } protected override void itemsListView_DragOver(object sender, DragEventArgs e) { e.Effect = DragDropEffects.None; if (validDragOperation) { if (((e.KeyState & 32) == 32) && !draggedItemsAlreadyContained) e.Effect = DragDropEffects.Link; // ALT key else if (((e.KeyState & 4) == 4) && !draggedItemsAlreadyContained) e.Effect = DragDropEffects.Move; // SHIFT key else if (e.AllowedEffect.HasFlag(DragDropEffects.Copy)) e.Effect = DragDropEffects.Copy; else if (e.AllowedEffect.HasFlag(DragDropEffects.Move) && !draggedItemsAlreadyContained) e.Effect = DragDropEffects.Move; else if (e.AllowedEffect.HasFlag(DragDropEffects.Link) && !draggedItemsAlreadyContained) e.Effect = DragDropEffects.Link; } } } }