source: branches/CEDMA-Refactoring-Ticket419/HeuristicLab.Core/OperatorLibraryEditor.cs @ 1265

#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2008 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 <http://www.gnu.org/licenses/>.
 */
#endregion

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
using HeuristicLab.PluginInfrastructure;

namespace HeuristicLab.Core {
  /// <summary>
  /// Visual representation of the class <see cref="IOperatorLibrary"/>.
  /// </summary>
  public partial class OperatorLibraryEditor : EditorBase {
    private ChooseOperatorDialog chooseOperatorDialog;

    /// <summary>
    /// Gets or sets the operator library that should be displayed.
    /// </summary>
    /// <remarks>Uses property <see cref="ViewBase.Item"/> of base class <see cref="EditorBase"/>.</remarks>
    public IOperatorLibrary OperatorLibrary {
      get { return (IOperatorLibrary)Item; }
      set { base.Item = value; }
    }

    /// <summary>
    /// Initializes a new instance of <see cref="OperatorLibraryEditor"/> with caption 
    /// <c>Operator Library</c>.
    /// </summary>
    public OperatorLibraryEditor() {
      InitializeComponent();
      operatorsTreeView.TreeViewNodeSorter = new NodeSorter();
      Caption = "Operator Library";
    }
    /// <summary>
    /// Initializes a new instance of <see cref="OperatorLibraryEditor"/> with the 
    /// specified <paramref name="operatorLibrary"/>.
    /// </summary>
    /// <param name="operatorLibrary">The operator library to display.</param>
    public OperatorLibraryEditor(IOperatorLibrary operatorLibrary)
      : this() {
      OperatorLibrary = operatorLibrary;
    }

    private class NodeSorter : IComparer {
      public int Compare(object x, object y) {
        TreeNode tx = x as TreeNode;
        TreeNode ty = y as TreeNode;

        int result = string.Compare(tx.Text, ty.Text);
        if (result == 0)
          result = tx.Index.CompareTo(ty.Index);
        return result;
      }
    }

    /// <summary>
    /// Updates all controls with the latest data of the model.
    /// </summary>
    /// <remarks>Calls <see cref="EditorBase.UpdateControls"/> of base class <see cref="EditorBase"/>.</remarks>
    protected override void UpdateControls() {
      base.UpdateControls();
      operatorsTreeView.Nodes.Clear();
      addGroupButton.Enabled = false;
      addOperatorButton.Enabled = false;
      removeButton.Enabled = false;
      if (OperatorLibrary == null) {
        Caption = "Operator Library";
        operatorsGroupBox.Enabled = false;
      } else {
        Caption = OperatorLibrary.Group.Name + " (" + OperatorLibrary.GetType().Name + ")";
        operatorsGroupBox.Enabled = true;
        operatorsTreeView.Nodes.Add(CreateTreeNode(OperatorLibrary.Group));
        operatorsTreeView.Sort();
      }
    }

    private TreeNode CreateTreeNode(IOperatorGroup group) {
      TreeNode node = new TreeNode();
      node.Text = group.Name;
      node.ForeColor = Color.LightGray;
      node.Tag = group;

      foreach (IOperator op in group.Operators)
        node.Nodes.Add(CreateTreeNode(op));
      foreach (IOperatorGroup subGroup in group.SubGroups)
        node.Nodes.Add(CreateTreeNode(subGroup));
      return node;
    }
    private TreeNode CreateTreeNode(IOperator op) {
      TreeNode node = new TreeNode();
      node.Text = op.Name;
      node.ToolTipText = op.GetType().Name;
      node.Tag = op;
      return node;
    }
    private void RemoveTreeNode(TreeNode node) {
      if (node.Tag is IOperatorGroup) {
        IOperatorGroup group = node.Tag as IOperatorGroup;
        IOperatorGroup parent = node.Parent.Tag as IOperatorGroup;
        parent.RemoveSubGroup(group);
      } else if (node.Tag is IOperator) {
        IOperator op = node.Tag as IOperator;
        IOperatorGroup group = node.Parent.Tag as IOperatorGroup;
        group.RemoveOperator(op);
      }
      node.Remove();
      EnableDisableButtons();
    }

    private void EnableDisableButtons() {
      addGroupButton.Enabled = false;
      addOperatorButton.Enabled = false;
      removeButton.Enabled = false;
      operatorsTreeView.Focus();

      if (operatorsTreeView.SelectedNode != null) {
        if (operatorsTreeView.SelectedNode.Parent != null)
          removeButton.Enabled = true;
        if (operatorsTreeView.SelectedNode.Tag is IOperatorGroup) {
          addGroupButton.Enabled = true;
          addOperatorButton.Enabled = true;
        }
      }
    }

    private void MergeOperatorLibrary(IOperatorGroup src, IOperatorGroup dest) {
      foreach(IOperator op in src.Operators) {
        if(!Contains(dest, op)) {
          dest.AddOperator(op);
        }
      }

      foreach(OperatorGroup group in src.SubGroups) {
        bool mergedIntoExistingGroup = false;
        // try to find a group in dest with matching name
        foreach(OperatorGroup destGroup in dest.SubGroups) {
          if(group.Name == destGroup.Name) {
            MergeOperatorLibrary(group, destGroup);
            mergedIntoExistingGroup = true;
            break;
          }
        }
        if(!mergedIntoExistingGroup) {
          OperatorGroup newGroup = new OperatorGroup();
          newGroup.Name = group.Name;
          dest.AddSubGroup(newGroup);
          MergeOperatorLibrary(group, newGroup);
        }
      }
    }

    private bool Contains(IOperatorGroup group, IOperator op) {
      foreach(IOperator destOp in group.Operators) {
        if(op.Name == destOp.Name) {
          return true;
        }
      }
      return false;
    }


    #region TreeView Events
    private void operatorsTreeView_AfterSelect(object sender, TreeViewEventArgs e) {
      EnableDisableButtons();
    }
    private void operatorsTreeView_AfterLabelEdit(object sender, NodeLabelEditEventArgs e) {
      e.CancelEdit = false;

      string name = e.Label;
      if (name != null) {
        if (e.Node.Tag is IOperatorGroup)
          ((IOperatorGroup)e.Node.Tag).Name = name;
        else if (e.Node.Tag is IOperator)
          ((IOperator)e.Node.Tag).Name = name;
      }
    }
    private void operatorsTreeView_DoubleClick(object sender, EventArgs e) {
      if (operatorsTreeView.SelectedNode != null) {
        IOperator op = operatorsTreeView.SelectedNode.Tag as IOperator;
        if (op != null) {
          IView view = op.CreateView();
          if (view != null)
            PluginManager.ControlManager.ShowControl(view);
        }
      }
    }
    #endregion

    #region Button Events
    private void addOperatorButton_Click(object sender, EventArgs e) {
      if (chooseOperatorDialog == null) chooseOperatorDialog = new ChooseOperatorDialog();
      if (chooseOperatorDialog.ShowDialog(this) == DialogResult.OK) {
        TreeNode node = operatorsTreeView.SelectedNode;
        IOperatorGroup group = node.Tag as IOperatorGroup;
        group.AddOperator(chooseOperatorDialog.Operator);
        node.Nodes.Add(CreateTreeNode(chooseOperatorDialog.Operator));
        operatorsTreeView.Sort();
        EnableDisableButtons();
      }
    }
    private void addGroupButton_Click(object sender, EventArgs e) {
      TreeNode node = operatorsTreeView.SelectedNode;
      IOperatorGroup newGroup = new OperatorGroup();
      IOperatorGroup group = node.Tag as OperatorGroup;
      group.AddSubGroup(newGroup);
      node.Nodes.Add(CreateTreeNode(newGroup));
      operatorsTreeView.Sort();
      EnableDisableButtons();
    }
    private void removeButton_Click(object sender, EventArgs e) {
      TreeNode node = operatorsTreeView.SelectedNode;
      RemoveTreeNode(node);
    }
    private void importButton_Click(object sender, EventArgs e) {
      if(openFileDialog.ShowDialog() == DialogResult.OK) {
        IOperatorLibrary loadedLibrary = (PersistenceManager.Load(openFileDialog.FileName) as IOperatorLibrary);
        if(loadedLibrary == null) {
          Auxiliary.ShowErrorMessageBox("The selected file does not contain an operator library");
        } else {
          MergeOperatorLibrary(loadedLibrary.Group, OperatorLibrary.Group);
          Refresh();
        }
      }
    }
    #endregion

    #region Key Events
    private void operatorsTreeView_KeyDown(object sender, KeyEventArgs e) {
      TreeNode node = operatorsTreeView.SelectedNode;
      if ((e.KeyCode == Keys.Delete) && (node != null) && (node.Parent != null))
        RemoveTreeNode(operatorsTreeView.SelectedNode);
      if ((e.KeyCode == Keys.F2) && (node != null))
        node.BeginEdit();
    }
    #endregion


    #region Mouse Events
    private void operatorsTreeView_MouseDown(object sender, MouseEventArgs e) {
      if (e.Button != MouseButtons.Right) return;
      TreeNode clickedNode = operatorsTreeView.GetNodeAt(e.X, e.Y);
      if (clickedNode != null) {
        operatorsTreeView.SelectedNode = clickedNode;
        operatorsTreeView.Refresh();
      }
    }
    #endregion


    #region Context Menu Events
    private void contextMenuStrip_Opening(object sender, CancelEventArgs e) {
      viewToolStripMenuItem.Enabled = false;
      if (operatorsTreeView.SelectedNode != null) {
        IOperator op = operatorsTreeView.SelectedNode.Tag as IOperator;
        if (op != null) {
          IView view = op.CreateView();
          if (view != null) {
            viewToolStripMenuItem.Enabled = true;
            viewToolStripMenuItem.Tag = view;
          }
        }
      }
    }
    private void viewToolStripMenuItem_Click(object sender, EventArgs e) {
      IView view = (IView)viewToolStripMenuItem.Tag;
      PluginManager.ControlManager.ShowControl(view);
    }
    #endregion

    #region Drag and Drop Events
    private void operatorsTreeView_ItemDrag(object sender, ItemDragEventArgs e) {
      TreeNode node = (TreeNode)e.Item;
      IOperator op = node.Tag as IOperator;
      if (op != null) {
        DataObject data = new DataObject();
        data.SetData("IOperator", op);
        data.SetData("DragSource", operatorsTreeView);
        DoDragDrop(data, DragDropEffects.Copy);
      }
    }
    private void operatorsTreeView_DragEnter(object sender, DragEventArgs e) {
      e.Effect = DragDropEffects.None;
      if (e.Data.GetDataPresent("IOperator")) {
        Point p = operatorsTreeView.PointToClient(new Point(e.X, e.Y));
        TreeNode node = operatorsTreeView.GetNodeAt(p);
        if ((node != null) && (node.Tag is IOperatorGroup))
          e.Effect = DragDropEffects.Copy;
      }
    }
    private void operatorsTreeView_DragOver(object sender, DragEventArgs e) {
      e.Effect = DragDropEffects.None;
      if (e.Data.GetDataPresent("IOperator")) {
        Point p = operatorsTreeView.PointToClient(new Point(e.X, e.Y));
        TreeNode node = operatorsTreeView.GetNodeAt(p);
        if ((node != null) && (node.Tag is IOperatorGroup))
          e.Effect = DragDropEffects.Copy;
      }
    }
    private void operatorsTreeView_DragDrop(object sender, DragEventArgs e) {
      if (e.Effect != DragDropEffects.None) {
        if (e.Data.GetDataPresent("IOperator")) {
          IOperator op = (IOperator)e.Data.GetData("IOperator");
          Point p = operatorsTreeView.PointToClient(new Point(e.X, e.Y));
          TreeNode node = operatorsTreeView.GetNodeAt(p);
          if (node != null) {
            op = (IOperator)op.Clone();

            while (op.SubOperators.Count > 0)
              op.RemoveSubOperator(0);

            IOperatorGroup group = (IOperatorGroup)node.Tag;
            group.AddOperator(op);
            node.Nodes.Add(CreateTreeNode(op));
            operatorsTreeView.Sort();
            EnableDisableButtons();
          }
        }
      }
    }
    #endregion

  }
}