Mercurial > silverbladetech

comparison Chronosv2/source/WidgetLibrary/WidgetLibraryViewModel.cs @ 10:443821e55f06

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial cleaned up add from Codeplex files
author stevenh7776 stevenhollidge@hotmail.com
date Tue, 21 Feb 2012 17:25:44 +0700
parents
children 741981715d94
comparison
equal deleted inserted replaced
9:904a9faadf8b 10:443821e55f06
1 using System;
2 using System.Collections.Generic;
3 using System.Collections.ObjectModel;
4 using System.ComponentModel;
5 using System.Linq;
6 using System.Windows.Input;
7 using Chronos.Presentation.Core.Configuration;
8 using Chronos.Presentation.Core.VirtualDesktops;
9 using Chronos.Presentation.Core.Widgets;
10 using Chronos.Presentation.Core.Windows;
11 using Chronos.Presentation.ViewModel;
12 using NLog;
13 using nRoute.Components;
14
15 namespace Chronos.WidgetLibrary
16 {
17 /// <summary>
18 /// Widget library ViewModel
19 /// </summary>
20 public sealed class WidgetLibraryViewModel
21 : WidgetViewModel
22 {
23 #region · Constants ·
24
25 private static readonly string AllWidgetsKey = "All";
26
27 #endregion
28
29 #region · PropertyChangedEventArgs Cached Instances ·
30
31 private static readonly PropertyChangedEventArgs FilterChangedArgs = CreateArgs<WidgetLibraryViewModel>(x => x.Filter);
32 private static readonly PropertyChangedEventArgs WidgetsChangedArgs = CreateArgs<WidgetLibraryViewModel>(x => x.Widgets);
33 private static readonly PropertyChangedEventArgs SelectedWidgetChangedArgs = CreateArgs<WidgetLibraryViewModel>(x => x.SelectedWidget);
34
35 #endregion
36
37 #region · Fields ·
38
39 private string filter;
40 private List<string> groups;
41 private List<WidgetItemViewModel> widgets;
42 private IWidget selectedWidget;
43 private ActionCommand createWidgetCommand;
44
45 #endregion
46
47 #region · Commands ·
48
49 /// <summary>
50 /// Gets the create widget command.
51 /// </summary>
52 /// <value>The create widget command.</value>
53 public ActionCommand CreateWidgetCommand
54 {
55 get
56 {
57 if (this.createWidgetCommand == null)
58 {
59 this.createWidgetCommand = new ActionCommand
60 (
61 () => OnCreateWidget(),
62 () => CanCreateWidget()
63 );
64 }
65
66 return this.createWidgetCommand;
67 }
68 }
69
70 #endregion
71
72 #region · Properties ·
73
74 /// <summary>
75 /// Gets/sets a fragment of the name to filter for.
76 /// </summary>
77 public string Filter
78 {
79 get { return this.filter; }
80 set
81 {
82 if (value != filter)
83 {
84 this.filter = value;
85 this.NotifyPropertyChanged(FilterChangedArgs);
86 this.NotifyPropertyChanged(WidgetsChangedArgs);
87
88 this.SelectedWidget = null;
89 }
90 }
91 }
92
93 /// <summary>
94 /// Gets the list of widget groups.
95 /// </summary>
96 /// <value>The groups.</value>
97 public IEnumerable<string> Groups
98 {
99 get { return this.groups; }
100 }
101
102 /// <summary>
103 /// Gets the list of widgets
104 /// </summary>
105 public IList<WidgetItemViewModel> Widgets
106 {
107 get
108 {
109 if (String.IsNullOrEmpty(this.filter)
110 || this.filter == AllWidgetsKey)
111 {
112 return this.widgets;
113 }
114 else
115 {
116 return new ReadOnlyCollection<WidgetItemViewModel>(this.widgets.Where(x => x.Group == this.filter).ToList());
117 }
118 }
119 }
120
121 /// <summary>
122 /// Gets or sets the selected widget.
123 /// </summary>
124 /// <value>The selected widget.</value>
125 public IWidget SelectedWidget
126 {
127 get { return this.selectedWidget; }
128 set
129 {
130 if (this.selectedWidget != value)
131 {
132 this.selectedWidget = value;
133 this.NotifyPropertyChanged(SelectedWidgetChangedArgs);
134 this.CreateWidgetCommand.RequeryCanExecute();
135 }
136 }
137 }
138
139 #endregion
140
141 #region · Constructors ·
142
143 /// <summary>
144 /// Initializes a new instance of the <see cref="WidgetLibrary"/> class.
145 /// </summary>
146 public WidgetLibraryViewModel()
147 : base()
148 {
149 this.widgets = this.DiscoverWidgets();
150 this.groups = this.DiscoverWidgetGroups();
151 }
152
153 #endregion
154
155 #region · Overriden Methods ·
156
157 /// <summary>
158 /// Called when the related view is being closed.
159 /// </summary>
160 public override void Close()
161 {
162 base.Close();
163
164 this.selectedWidget = null;
165 this.createWidgetCommand = null;
166
167 if (this.groups != null)
168 {
169 this.groups.Clear();
170 this.groups = null;
171 }
172
173 if (this.widgets != null)
174 {
175 this.widgets.Clear();
176 this.widgets = null;
177 }
178 }
179
180 #endregion
181
182 #region · Command Actions ·
183
184 private bool CanCreateWidget()
185 {
186 return (this.selectedWidget != null);
187 }
188
189 /// <summary>
190 /// Handles the create widget command.
191 /// </summary>
192 private void OnCreateWidget()
193 {
194 this.GetService<IVirtualDesktopManager>()
195 .Show(this.selectedWidget.CreateView() as IDesktopElement);
196 }
197
198 #endregion
199
200 #region · Private Methods ·
201
202 private List<string> DiscoverWidgetGroups()
203 {
204 List<string> groups = new List<string>();
205 var q = from widgetdef in this.widgets
206 select widgetdef.Group;
207
208 groups.Add(AllWidgetsKey);
209 groups.AddRange(q.Distinct().ToList());
210
211 return groups;
212 }
213
214 private List<WidgetItemViewModel> DiscoverWidgets()
215 {
216 IEnumerable<IWidget> widgetDefs = this.GetService<IWidgetConfigurationService>()
217 .GetWidgets();
218
219 if (widgetDefs != null)
220 {
221 var query = from widgetdef in widgetDefs
222 select new WidgetItemViewModel(widgetdef);
223
224 return query.ToList();
225 }
226
227 return null;
228 }
229
230 #endregion
231 }
232 }