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source: trunk/sources/HeuristicLab.MainForm.WindowsForms/3.3/Controls/ViewHost.cs @ 9456

Last change on this file since 9456 was 9456, checked in by swagner, 10 years ago

Updated copyright year and added some missing license headers (#1889)

File size: 11.8 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2013 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 dispose 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              if (ViewsLabelVisible) {
96                view.Anchor = AnchorStyles.Bottom | AnchorStyles.Left | AnchorStyles.Top | AnchorStyles.Right;
97                view.Size = new Size(Width - this.viewsLabel.Width - this.viewsLabel.Margin.Left - this.viewsLabel.Margin.Right, this.Height);
98              } else view.Dock = DockStyle.Fill;
99              if (!Controls.Contains((view))) Controls.Add(view);
100              view.OnShown(new ViewShownEventArgs(view, false));
101            }
102          } else viewType = null;
103          configurationLabel.Visible = activeView is IConfigureableView;
104          configurationLabel.Enabled = activeView != null && !activeView.Locked;
105        }
106      }
107    }
108
109    private Type viewType;
110    public Type ViewType {
111      get { return viewType; }
112      set {
113        if (viewType != value) {
114          if (value == typeof(ViewHost))
115            throw new ArgumentException("Directly nested ViewHosts are not allowed.");
116          if (value != null && Content != null && !ViewCanShowContent(value, Content))
117            throw new ArgumentException(string.Format("View \"{0}\" cannot display content \"{1}\".", value, Content.GetType()));
118
119          viewType = value;
120          OnViewTypeChanged();
121        }
122      }
123    }
124
125    protected override void SetEnabledStateOfControls() {
126      Enabled = Content != null;
127    }
128
129    protected override void OnContentChanged() {
130      viewContextMenuStrip.Item = Content;
131      //change ViewType if view of ViewType can not show content or is null
132      if (Content != null) {
133        if (!ViewCanShowContent(viewType, Content)) {
134          Type defaultViewType = MainFormManager.GetDefaultViewType(Content.GetType());
135          if (cachedView != null && cachedView.GetType() == defaultViewType)
136            ActiveView = cachedView;
137          else if (defaultViewType != null)
138            ViewType = defaultViewType;
139          else if (viewContextMenuStrip.Items.Count > 0)  // create first available view if no default view is available
140            ViewType = (Type)viewContextMenuStrip.Items[0].Tag;
141          else {
142            ViewType = null;
143            ActiveView = null;
144          }
145        }
146        if (ActiveView != null) ActiveView.Content = Content;
147      } else ActiveView = null;
148      UpdateLabels();
149      UpdateActiveMenuItem();
150    }
151
152    private void UpdateLabels() {
153      if (Content != null && viewContextMenuStrip.Items.Count > 0) {
154        messageLabel.Visible = false;
155        viewsLabel.Visible = viewsLabelVisible;
156      } else if (Content != null) {
157        messageLabel.Visible = true;
158        viewsLabel.Visible = false;
159      } else {
160        messageLabel.Visible = false;
161        viewsLabel.Visible = false;
162      }
163    }
164
165    private void OnViewTypeChanged() {
166      if (viewType != null) {
167        if (!ViewCanShowContent(viewType, Content))
168          throw new InvalidOperationException(string.Format("View \"{0}\" cannot display content \"{1}\".",
169                                                            viewType, Content.GetType()));
170        IContentView view = MainFormManager.CreateView(viewType);
171        view.Locked = Locked;
172        view.ReadOnly = ReadOnly;
173        ActiveView = view; //necessary to allow the views to change the status of the viewhost
174        view.Content = Content;
175
176        UpdateActiveMenuItem();
177      }
178    }
179
180    private void RegisterActiveViewEvents() {
181      activeView.CaptionChanged += new EventHandler(activeView_CaptionChanged);
182      activeView.LockedChanged += new EventHandler(activeView_LockedChanged);
183      activeView.Changed += new EventHandler(activeView_Changed);
184    }
185    private void DeregisterActiveViewEvents() {
186      activeView.CaptionChanged -= new EventHandler(activeView_CaptionChanged);
187      activeView.LockedChanged -= new EventHandler(activeView_LockedChanged);
188      activeView.Changed -= new EventHandler(activeView_Changed);
189    }
190    private void activeView_CaptionChanged(object sender, EventArgs e) {
191      Caption = activeView.Caption;
192    }
193    private void activeView_LockedChanged(object sender, EventArgs e) {
194      Locked = activeView.Locked;
195      configurationLabel.Enabled = !activeView.Locked;
196    }
197    private void activeView_Changed(object sender, EventArgs e) {
198      OnChanged();
199    }
200
201    protected override void OnSizeChanged(EventArgs e) {
202      //mkommend: solution to resizing issues. taken from http://support.microsoft.com/kb/953934
203      //not implemented with a panel to reduce the number of nested controls
204      //also cf. http://connect.microsoft.com/VisualStudio/feedback/details/98368/csc-incorrectly-allows-comparison-between-intptr-and-null
205      if (Handle != IntPtr.Zero)
206        this.BeginInvoke((Action<EventArgs>)OnSizeChangedHelper, e);
207    }
208    private void OnSizeChangedHelper(EventArgs e) {
209      base.OnSizeChanged(e);
210      viewsLabel.Location = new Point(Width - viewsLabel.Margin.Right - viewsLabel.Width, viewsLabel.Margin.Top);
211      configurationLabel.Location = new Point(Width - configurationLabel.Margin.Right - configurationLabel.Width, viewsLabel.Bottom + viewsLabel.Margin.Bottom + configurationLabel.Margin.Top);
212
213    }
214
215    #region forwarding of view events
216    internal protected override void OnShown(ViewShownEventArgs e) {
217      base.OnShown(e);
218      View view = ActiveView as View;
219      if (view != null)
220        view.OnShown(e);
221    }
222    internal protected override void OnHidden(EventArgs e) {
223      base.OnHidden(e);
224      View view = ActiveView as View;
225      if (view != null)
226        view.OnHidden(e);
227    }
228    internal protected override void OnClosing(FormClosingEventArgs e) {
229      base.OnClosing(e);
230      View view = ActiveView as View;
231      if (view != null)
232        view.OnClosing(e);
233    }
234    internal protected override void OnClosed(FormClosedEventArgs e) {
235      base.OnClosed(e);
236      View view = ActiveView as View;
237      if (view != null)
238        view.OnClosed(e);
239    }
240    #endregion
241
242    #region GUI actions
243    private void UpdateActiveMenuItem() {
244      foreach (KeyValuePair<Type, ToolStripMenuItem> item in viewContextMenuStrip.MenuItems) {
245        if (item.Key == viewType) {
246          item.Value.Checked = true;
247          item.Value.Enabled = false;
248        } else {
249          item.Value.Checked = false;
250          item.Value.Enabled = true;
251        }
252      }
253    }
254
255    private bool ViewCanShowContent(Type viewType, object content) {
256      if (content == null) // every view can display null
257        return true;
258      if (viewType == null)
259        return false;
260      return ContentAttribute.CanViewType(viewType, Content.GetType()) && viewContextMenuStrip.MenuItems.Any(item => item.Key == viewType);
261    }
262
263    private void viewsLabel_DoubleClick(object sender, EventArgs e) {
264      IContentView view = MainFormManager.MainForm.ShowContent(this.Content, this.ViewType);
265      if (view != null) {
266        view.ReadOnly = this.ReadOnly;
267        view.Locked = this.Locked;
268      }
269    }
270    private void viewContextMenuStrip_ItemClicked(object sender, ToolStripItemClickedEventArgs e) {
271      Type viewType = (Type)e.ClickedItem.Tag;
272      ViewType = viewType;
273    }
274
275    private bool startDragAndDrop;
276    private void viewsLabel_MouseDown(object sender, MouseEventArgs e) {
277      if (e.Button == System.Windows.Forms.MouseButtons.Right) {
278        Screen screen = Screen.FromControl(viewsLabel);
279        int rightBorder = viewsLabel.PointToScreen(viewsLabel.Location).X + viewContextMenuStrip.Width; //
280        rightBorder = rightBorder - screen.Bounds.X; //pixel position on active screen
281
282        if (rightBorder < screen.Bounds.Width)
283          viewContextMenuStrip.Show(viewsLabel, viewsLabel.Margin.Left, viewsLabel.Margin.Top);
284        else
285          viewContextMenuStrip.Show(screen.Bounds.X + screen.Bounds.Width - viewContextMenuStrip.Width, viewsLabel.PointToScreen(viewsLabel.Location).Y - viewsLabel.Margin.Top);
286      } else if (!Locked) {
287        startDragAndDrop = true;
288        viewsLabel.Capture = false;
289        viewsLabel.Focus();
290      }
291    }
292    private void viewsLabel_MouseLeave(object sender, EventArgs e) {
293      if ((Control.MouseButtons & MouseButtons.Left) == MouseButtons.Left && startDragAndDrop) {
294        DataObject data = new DataObject();
295        data.SetData(HeuristicLab.Common.Constants.DragDropDataFormat, Content);
296        DoDragDrop(data, DragDropEffects.Copy | DragDropEffects.Link);
297      } else
298        startDragAndDrop = false;
299    }
300
301    private void configurationLabel_DoubleClick(object sender, MouseEventArgs e) {
302      ((IConfigureableView)ActiveView).ShowConfiguration();
303    }
304    #endregion
305  }
306}
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