private void ExecutePattern(TreeNode node)
{
TreeNodeCommand nodeCmd = node as TreeNodeCommand;
if (nodeCmd == null)
{
return; // Nothing to do if the node is not a leaf
}
nodeCmd.Command.Do();
}
private void FormMain_Load(object sender, EventArgs e)
{
/*** Init Components ***/
// Initialize each pattern with their details
m_gof.LoadFiles(PatternCategory.Creational, c_sCreationalPath);
m_gof.LoadFiles(PatternCategory.Structural, c_sStructuralPath);
m_gof.LoadFiles(PatternCategory.Behavioral, c_sBehavioralPath);
// Create two root node
// 1) Sort pattern by category
// 2) Sort pattern by frequency level
m_gofByCategoryNode = new TreeNode(m_gof.Name);
m_gofByLevelNode = new TreeNode(m_gof.Name);
// Create nodes for each category
TreeNode creationalNode = new TreeNode("Creational Patterns");
TreeNode structuralNode = new TreeNode("Structural Patterns");
TreeNode behavioralNode = new TreeNode("Behavioral Patterns");
// Add each category to the appropriate root
m_gofByCategoryNode.Nodes.Add(creationalNode);
m_gofByCategoryNode.Nodes.Add(structuralNode);
m_gofByCategoryNode.Nodes.Add(behavioralNode);
// Create nodes for each frequency level
// Add each fequency level to the appropriate root
// Load frequency images
TreeNode node;
string sImageFormat = Path.Combine(c_sImagePath, c_sImageFormat);
m_frequencyLevelImages.Add(Image.FromFile(string.Format(sImageFormat, 0)));
foreach (int i in Enumerable.Range(1, GangOfFour.FrequencyLevelCount))
{
node = new TreeNode("Level " + i);
m_gofByLevelNode.Nodes.Insert(0, node); // Order by level desc
m_frequencyLevelImages.Add(Image.FromFile(string.Format(sImageFormat, i)));
}
// Create nodes for each pattern
TreeNodeCommand nodeCmd;
foreach (Pattern pattern in m_gof.Items)
{
// Create a node for a pattern
nodeCmd = new TreeNodeCommand(pattern.Name);
// Set the concrete commands to the invoker (see: command design pattern)
nodeCmd.Command = new CommandPattern(nodeCmd.Text, m_gof);
// Dispatch it to the appropriate category
switch (pattern.Category)
{
case PatternCategory.Creational:
creationalNode.Nodes.Add(nodeCmd);
break;
case PatternCategory.Structural:
structuralNode.Nodes.Add(nodeCmd);
break;
case PatternCategory.Behavioral:
behavioralNode.Nodes.Add(nodeCmd);
break;
default:
break;
}
// Do the same for the level frequency
// A tree node does not support to be added at different places
// Then, it has to be cloned
nodeCmd = (TreeNodeCommand)nodeCmd.Clone();
node = m_gofByLevelNode.Nodes[GangOfFour.FrequencyLevelCount - pattern.FrequencyLevel];
node.Nodes.Add(nodeCmd);
}
/*** Init UI ***/
// Select the category sort at first
m_treeView.Nodes.Add(m_gofByCategoryNode);
m_treeView.ExpandAll();
// Select the node during a right click event
// (By default a node is also selected with a left click event)
m_treeView.NodeMouseClick += (s, args) => m_treeView.SelectedNode = args.Node;
}