1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 | *
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5 | * This file is part of HeuristicLab.
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6 | *
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7 | * HeuristicLab is free software: you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation, either version 3 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * HeuristicLab is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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19 | */
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20 | #endregion
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21 |
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22 | using System;
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23 | using System.Collections.Generic;
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24 | using System.Linq;
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25 | using System.Windows.Forms;
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26 | using HeuristicLab.MainForm;
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27 | using HeuristicLab.Common;
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28 |
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29 | namespace HeuristicLab.MainForm.WindowsForms {
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30 | [Content(typeof(IContent))]
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31 | public sealed partial class ViewHost : AsynchronousContentView {
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32 | public ViewHost() {
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33 | InitializeComponent();
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34 | cachedViews = new Dictionary<Type, IContentView>();
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35 | viewType = null;
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36 | startDragAndDrop = false;
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37 | viewContextMenuStrip.IgnoredViewTypes = new List<Type>() { typeof(ViewHost) };
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38 | activeView = null;
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39 | Content = null;
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40 | OnContentChanged();
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41 | }
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42 |
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43 | private bool viewShown;
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44 | private Dictionary<Type, IContentView> cachedViews;
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45 | public IEnumerable<IContentView> Views {
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46 | get { return cachedViews.Values; }
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47 | }
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48 |
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49 | private IContentView activeView;
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50 | public IContentView ActiveView {
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51 | get { return this.activeView; }
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52 | private set {
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53 | if (activeView != value) {
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54 | if (activeView != null) {
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55 | DeregisterActiveViewEvents();
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56 | View view = activeView as View;
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57 | if (view != null)
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58 | view.OnHidden(EventArgs.Empty);
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59 | }
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60 | activeView = value;
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61 | if (activeView != null) {
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62 | RegisterActiveViewEvents();
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63 | View view = activeView as View;
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64 | if (view != null)
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65 | view.OnShown(new ViewShownEventArgs(view, false));
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66 | }
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67 | ActiveViewChanged();
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68 | OnViewTypeChanged();
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69 | }
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70 | }
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71 | }
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72 | private Type viewType;
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73 | public Type ViewType {
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74 | get { return this.viewType; }
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75 | set {
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76 | if (viewType != value) {
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77 | if (value != null && !ViewCanShowContent(value, Content))
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78 | throw new ArgumentException(string.Format("View \"{0}\" cannot display content \"{1}\".",
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79 | value, Content.GetType()));
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80 | viewType = value;
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81 | OnViewTypeChanged();
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82 | }
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83 | }
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84 | }
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85 |
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86 | public new bool Enabled {
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87 | get { return base.Enabled; }
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88 | set {
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89 | this.SuspendRepaint();
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90 | base.Enabled = value;
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91 | this.viewsLabel.Enabled = value;
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92 | this.ResumeRepaint(true);
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93 | }
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94 | }
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95 |
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96 | protected override void OnContentChanged() {
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97 | viewContextMenuStrip.Item = Content;
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98 |
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99 | if (Content != null) {
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100 | if (viewContextMenuStrip.Items.Count == 0) {
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101 | messageLabel.Visible = true;
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102 | viewsLabel.Visible = false;
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103 | viewPanel.Visible = false;
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104 | } else {
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105 | messageLabel.Visible = false;
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106 | viewsLabel.Visible = true;
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107 | viewPanel.Visible = true;
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108 | }
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109 |
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110 | if (!ViewCanShowContent(viewType, Content)) {
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111 | cachedViews.Clear();
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112 | ViewType = MainFormManager.GetDefaultViewType(Content.GetType());
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113 | if ((viewType == null) && (viewContextMenuStrip.Items.Count > 0)) // create first available view if default view is not available
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114 | ViewType = (Type)viewContextMenuStrip.Items[0].Tag;
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115 | }
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116 | UpdateActiveMenuItem();
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117 | foreach (IContentView view in cachedViews.Values)
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118 | view.Content = this.Content;
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119 | } else {
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120 | messageLabel.Visible = false;
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121 | viewsLabel.Visible = false;
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122 | viewPanel.Visible = false;
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123 | }
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124 | }
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125 |
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126 | private void OnViewTypeChanged() {
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127 | viewPanel.Controls.Clear();
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128 | if (viewType == null || Content == null)
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129 | return;
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130 | if (!ViewCanShowContent(viewType, Content))
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131 | throw new InvalidOperationException(string.Format("View \"{0}\" cannot display content \"{1}\".",
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132 | viewType, Content.GetType()));
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133 | if (viewPanel.Height <= 10 || viewPanel.Width <= 10) {
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134 | viewShown = false;
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135 | return;
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136 | }
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137 |
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138 | viewShown = true;
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139 | UpdateActiveMenuItem();
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140 | IContentView view;
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141 | if (cachedViews.ContainsKey(ViewType))
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142 | view = cachedViews[ViewType];
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143 | else {
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144 | view = MainFormManager.CreateView(viewType);
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145 | view.ReadOnly = this.ReadOnly;
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146 | view.Locked = this.Locked;
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147 | cachedViews.Add(viewType, view);
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148 | }
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149 | this.ActiveView = view;
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150 | Control control = (Control)view;
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151 | control.Dock = DockStyle.Fill;
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152 | viewPanel.Controls.Add(control);
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153 | viewPanel.Visible = true;
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154 | view.Content = Content;
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155 | }
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156 |
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157 | private void viewPanel_Resize(object sender, EventArgs e) {
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158 | if (!viewShown)
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159 | this.OnViewTypeChanged();
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160 | }
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161 |
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162 | private void RegisterActiveViewEvents() {
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163 | activeView.Changed += new EventHandler(activeView_Changed);
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164 | activeView.CaptionChanged += new EventHandler(activeView_CaptionChanged);
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165 | }
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166 | private void DeregisterActiveViewEvents() {
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167 | activeView.Changed -= new EventHandler(activeView_Changed);
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168 | activeView.CaptionChanged -= new EventHandler(activeView_CaptionChanged);
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169 | }
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170 | private void activeView_CaptionChanged(object sender, EventArgs e) {
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171 | this.ActiveViewChanged();
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172 | }
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173 | private void activeView_Changed(object sender, EventArgs e) {
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174 | this.ActiveViewChanged();
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175 | }
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176 | private void ActiveViewChanged() {
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177 | if (ActiveView != null) {
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178 | this.Caption = this.ActiveView.Caption;
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179 | this.Locked = this.ActiveView.Locked;
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180 | }
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181 | }
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182 | #region forwarding of view events
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183 | protected override void OnReadOnlyChanged() {
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184 | base.OnReadOnlyChanged();
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185 | foreach (IContentView view in cachedViews.Values)
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186 | view.ReadOnly = this.ReadOnly;
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187 | }
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188 | protected override void OnLockedChanged() {
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189 | base.OnLockedChanged();
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190 | foreach (IContentView view in cachedViews.Values)
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191 | view.Locked = this.Locked;
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192 | }
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193 | internal protected override void OnShown(ViewShownEventArgs e) {
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194 | base.OnShown(e);
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195 | View view = this.ActiveView as View;
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196 | if (view != null)
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197 | view.OnShown(e);
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198 | }
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199 | internal protected override void OnHidden(EventArgs e) {
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200 | base.OnHidden(e);
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201 | View view = this.ActiveView as View;
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202 | if (view != null)
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203 | view.OnHidden(e);
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204 | }
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205 | internal protected override void OnClosing(FormClosingEventArgs e) {
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206 | base.OnClosing(e);
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207 | foreach (View view in this.Views.OfType<View>())
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208 | view.OnClosing(e);
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209 | }
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210 | internal protected override void OnClosed(FormClosedEventArgs e) {
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211 | base.OnClosed(e);
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212 | foreach (View view in this.Views.OfType<View>())
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213 | view.OnClosed(e);
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214 | }
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215 | #endregion
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216 |
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217 | #region GUI actions
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218 | private void UpdateActiveMenuItem() {
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219 | foreach (KeyValuePair<Type, ToolStripMenuItem> item in viewContextMenuStrip.MenuItems) {
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220 | if (item.Key == viewType) {
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221 | item.Value.Checked = true;
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222 | item.Value.Enabled = false;
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223 | } else {
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224 | item.Value.Checked = false;
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225 | item.Value.Enabled = true;
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226 | }
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227 | }
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228 | }
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229 |
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230 | private bool ViewCanShowContent(Type viewType, object content) {
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231 | if (content == null) // every view can display null
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232 | return true;
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233 | if (viewType == null)
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234 | return false;
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235 | return ContentAttribute.CanViewType(viewType, Content.GetType()) && viewContextMenuStrip.MenuItems.Any(item => item.Key == viewType);
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236 | }
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237 |
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238 | private void viewsLabel_DoubleClick(object sender, EventArgs e) {
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239 | IContentView view = MainFormManager.GetMainForm<MainForm>().ShowContent(this.Content,this.ViewType);
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240 | if (view != null) {
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241 | view.ReadOnly = this.ReadOnly;
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242 | view.Locked = this.Locked;
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243 | }
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244 | }
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245 | private void viewContextMenuStrip_ItemClicked(object sender, ToolStripItemClickedEventArgs e) {
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246 | Type viewType = (Type)e.ClickedItem.Tag;
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247 | ViewType = viewType;
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248 | }
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249 |
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250 | private bool startDragAndDrop;
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251 | private void viewsLabel_MouseDown(object sender, MouseEventArgs e) {
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252 | if (!Locked) {
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253 | startDragAndDrop = true;
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254 | viewsLabel.Capture = false;
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255 | viewsLabel.Focus();
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256 | }
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257 | }
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258 | private void viewsLabel_MouseLeave(object sender, EventArgs e) {
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259 | if ((Control.MouseButtons & MouseButtons.Left) == MouseButtons.Left && startDragAndDrop) {
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260 | DataObject data = new DataObject();
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261 | data.SetData("Type", Content.GetType());
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262 | data.SetData("Value", Content);
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263 | DoDragDrop(data, DragDropEffects.Copy | DragDropEffects.Link);
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264 | } else
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265 | startDragAndDrop = false;
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266 | }
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267 | #endregion
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268 | }
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269 | }
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