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source: branches/VNS/HeuristicLab.MainForm.WindowsForms/3.3/Controls/ViewHost.cs @ 5734

Last change on this file since 5734 was 5463, checked in by mkommend, 14 years ago

Reorganized Mainform.WindowsForms plugin and added DragOverTabControl (ticket #1058).

File size: 10.9 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2011 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Collections.Generic;
24using System.Drawing;
25using System.Linq;
26using System.Windows.Forms;
27using HeuristicLab.Common;
28
29namespace HeuristicLab.MainForm.WindowsForms {
30  [Content(typeof(IContent))]
31  public sealed partial class ViewHost : AsynchronousContentView {
32    public ViewHost() {
33      InitializeComponent();
34      startDragAndDrop = false;
35      viewContextMenuStrip.IgnoredViewTypes = new List<Type>() { typeof(ViewHost) };
36
37      viewType = null;
38      activeView = null;
39      Content = null;
40      messageLabel.Visible = false;
41      viewsLabel.Visible = false;
42      viewsLabelVisible = true;
43    }
44
45    private bool viewsLabelVisible;
46    public bool ViewsLabelVisible {
47      get { return viewsLabelVisible; }
48      set {
49        if (viewsLabelVisible != value) {
50          viewsLabelVisible = value;
51          viewsLabel.Visible = value;
52          View view = activeView as View;
53          if (view != null) view.Dock = viewsLabelVisible ? DockStyle.None : DockStyle.Fill;
54        }
55      }
56    }
57
58    private IContentView cachedView;
59    private IContentView activeView;
60    public IContentView ActiveView {
61      get { return activeView; }
62      private set {
63        if (activeView != value) {
64          if (activeView != null) {
65            cachedView = activeView;
66            DeregisterActiveViewEvents();
67            View cached = cachedView as View;
68            if (cached != null) {
69              cached.OnHidden(EventArgs.Empty);
70              cached.Visible = false;
71            }
72          }
73
74          activeView = value;
75
76          if (activeView != null) {
77            #region disposed cachedView
78            if (activeView != cachedView) {
79              if (cachedView != null) cachedView.Content = null;  //needed to deregister events
80              View cached = cachedView as View;
81              if (cached != null) {
82                Controls.Remove(cached);
83                cached.Dispose();
84              }
85              cachedView = null;
86            }
87            #endregion
88
89            this.Caption = activeView.Caption;
90            viewType = activeView.GetType();
91            RegisterActiveViewEvents();
92            View view = activeView as View;
93            if (view != null) {
94              view.Visible = true;
95              view.Anchor = AnchorStyles.Bottom | AnchorStyles.Left | AnchorStyles.Top | AnchorStyles.Right;
96              view.Size = new Size(Width - this.viewsLabel.Width - this.viewsLabel.Margin.Left - this.viewsLabel.Margin.Right, this.Height);
97              view.Dock = viewsLabelVisible ? DockStyle.None : DockStyle.Fill;
98              view.OnShown(new ViewShownEventArgs(view, false));
99              if (!Controls.Contains((view))) Controls.Add(view);
100            }
101          } else viewType = null;
102        }
103      }
104    }
105
106    private Type viewType;
107    public Type ViewType {
108      get { return viewType; }
109      set {
110        if (viewType != value) {
111          if (value == typeof(ViewHost))
112            throw new ArgumentException("Directly nested ViewHosts are not allowed.");
113          if (value != null && Content != null && !ViewCanShowContent(value, Content))
114            throw new ArgumentException(string.Format("View \"{0}\" cannot display content \"{1}\".", value, Content.GetType()));
115
116          viewType = value;
117          OnViewTypeChanged();
118        }
119      }
120    }
121
122    protected override void SetEnabledStateOfControls() {
123      Enabled = Content != null;
124    }
125
126    protected override void OnContentChanged() {
127      viewContextMenuStrip.Item = Content;
128      //change ViewType if view of ViewType can not show content or is null
129      if (Content != null) {
130        if (!ViewCanShowContent(viewType, Content)) {
131          Type defaultViewType = MainFormManager.GetDefaultViewType(Content.GetType());
132          if (cachedView != null && cachedView.GetType() == defaultViewType)
133            ActiveView = cachedView;
134          else if (defaultViewType != null)
135            ViewType = defaultViewType;
136          else if (viewContextMenuStrip.Items.Count > 0)  // create first available view if no default view is available
137            ViewType = (Type)viewContextMenuStrip.Items[0].Tag;
138          else {
139            ViewType = null;
140            ActiveView = null;
141          }
142        }
143        if (ActiveView != null) ActiveView.Content = Content;
144      } else ActiveView = null;
145      UpdateLabels();
146      UpdateActiveMenuItem();
147    }
148
149    private void UpdateLabels() {
150      if (Content != null && viewContextMenuStrip.Items.Count > 0) {
151        messageLabel.Visible = false;
152        viewsLabel.Visible = viewsLabelVisible;
153      } else if (Content != null) {
154        messageLabel.Visible = true;
155        viewsLabel.Visible = false;
156      } else {
157        messageLabel.Visible = false;
158        viewsLabel.Visible = false;
159      }
160    }
161
162    private void OnViewTypeChanged() {
163      if (viewType != null) {
164        if (!ViewCanShowContent(viewType, Content))
165          throw new InvalidOperationException(string.Format("View \"{0}\" cannot display content \"{1}\".",
166                                                            viewType, Content.GetType()));
167        IContentView view = MainFormManager.CreateView(viewType);
168        view.Locked = Locked;
169        view.ReadOnly = ReadOnly;
170        ActiveView = view; //necessary to allow the views to change the status of the viewhost
171        view.Content = Content;
172
173        UpdateActiveMenuItem();
174      }
175    }
176
177    private void RegisterActiveViewEvents() {
178      activeView.CaptionChanged += new EventHandler(activeView_CaptionChanged);
179      activeView.LockedChanged += new EventHandler(activeView_LockedChanged);
180    }
181    private void DeregisterActiveViewEvents() {
182      activeView.CaptionChanged -= new EventHandler(activeView_CaptionChanged);
183      activeView.LockedChanged -= new EventHandler(activeView_LockedChanged);
184    }
185    private void activeView_CaptionChanged(object sender, EventArgs e) {
186      Caption = activeView.Caption;
187    }
188    private void activeView_LockedChanged(object sender, EventArgs e) {
189      Locked = activeView.Locked;
190    }
191
192    protected override void OnSizeChanged(EventArgs e) {
193      //mkommend: solution to resizing issues. taken from http://support.microsoft.com/kb/953934
194      //not implemented with a panel to reduce the number of nested controls
195      if (Handle != null)
196        this.BeginInvoke((Action<EventArgs>)OnSizeChangedHelper, e);
197    }
198    private void OnSizeChangedHelper(EventArgs e) {
199      base.OnSizeChanged(e);
200      viewsLabel.Location = new Point(Width - viewsLabel.Margin.Right - viewsLabel.Width, viewsLabel.Margin.Top);
201    }
202
203    #region forwarding of view events
204    internal protected override void OnShown(ViewShownEventArgs e) {
205      base.OnShown(e);
206      View view = ActiveView as View;
207      if (view != null)
208        view.OnShown(e);
209    }
210    internal protected override void OnHidden(EventArgs e) {
211      base.OnHidden(e);
212      View view = ActiveView as View;
213      if (view != null)
214        view.OnHidden(e);
215    }
216    internal protected override void OnClosing(FormClosingEventArgs e) {
217      base.OnClosing(e);
218      View view = ActiveView as View;
219      if (view != null)
220        view.OnClosing(e);
221    }
222    internal protected override void OnClosed(FormClosedEventArgs e) {
223      base.OnClosed(e);
224      View view = ActiveView as View;
225      if (view != null)
226        view.OnClosed(e);
227    }
228    #endregion
229
230    #region GUI actions
231    private void UpdateActiveMenuItem() {
232      foreach (KeyValuePair<Type, ToolStripMenuItem> item in viewContextMenuStrip.MenuItems) {
233        if (item.Key == viewType) {
234          item.Value.Checked = true;
235          item.Value.Enabled = false;
236        } else {
237          item.Value.Checked = false;
238          item.Value.Enabled = true;
239        }
240      }
241    }
242
243    private bool ViewCanShowContent(Type viewType, object content) {
244      if (content == null) // every view can display null
245        return true;
246      if (viewType == null)
247        return false;
248      return ContentAttribute.CanViewType(viewType, Content.GetType()) && viewContextMenuStrip.MenuItems.Any(item => item.Key == viewType);
249    }
250
251    private void viewsLabel_DoubleClick(object sender, EventArgs e) {
252      IContentView view = MainFormManager.MainForm.ShowContent(this.Content, this.ViewType);
253      if (view != null) {
254        view.ReadOnly = this.ReadOnly;
255        view.Locked = this.Locked;
256      }
257    }
258    private void viewContextMenuStrip_ItemClicked(object sender, ToolStripItemClickedEventArgs e) {
259      Type viewType = (Type)e.ClickedItem.Tag;
260      ViewType = viewType;
261    }
262
263    private bool startDragAndDrop;
264    private void viewsLabel_MouseDown(object sender, MouseEventArgs e) {
265      if (e.Button == System.Windows.Forms.MouseButtons.Right) {
266        Screen screen = Screen.FromControl(viewsLabel);
267        int rightBorder = viewsLabel.PointToScreen(viewsLabel.Location).X + viewContextMenuStrip.Width; //
268        rightBorder = rightBorder - screen.Bounds.X; //pixel position on active screen
269
270        if (rightBorder < screen.Bounds.Width)
271          viewContextMenuStrip.Show(viewsLabel, viewsLabel.Margin.Left, viewsLabel.Margin.Top);
272        else
273          viewContextMenuStrip.Show(screen.Bounds.X + screen.Bounds.Width - viewContextMenuStrip.Width, viewsLabel.PointToScreen(viewsLabel.Location).Y - viewsLabel.Margin.Top);
274      } else if (!Locked) {
275        startDragAndDrop = true;
276        viewsLabel.Capture = false;
277        viewsLabel.Focus();
278      }
279    }
280    private void viewsLabel_MouseLeave(object sender, EventArgs e) {
281      if ((Control.MouseButtons & MouseButtons.Left) == MouseButtons.Left && startDragAndDrop) {
282        DataObject data = new DataObject();
283        data.SetData("Type", Content.GetType());
284        data.SetData("Value", Content);
285        DoDragDrop(data, DragDropEffects.Copy | DragDropEffects.Link);
286      } else
287        startDragAndDrop = false;
288    }
289    #endregion
290  }
291}
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