// The event handler called when you choose the options between:
// to see folder size information or file type size information
private void comboAction_SelectedIndexChanged(object sender, EventArgs e)
{
if (treeView.SelectedNode != null)
{
switch (comboActionStrategy.SelectedIndex)
{
case 0:
explorer = folderStrategy;
break;
case 1:
explorer = fileTypeStrategy;
break;
}
// Do exploration using selected exploration strategy
explorer.analyze(GetAbsolutePath(treeView.SelectedNode));
// Make sure that the display is visible
comboObserver_SelectedIndexChanged(null, null);
// Display status
labelStatus.Text = "Result of path " + GetAbsolutePath(treeView.SelectedNode);
}
}
public StorageExplorerForm()
{
InitializeComponent();
// Initialize the tree view
InitTreeView();
// Create the strategy subjects
folderStrategy = new DirectoryStrategy();
fileTypeStrategy = new FileExtensionStrategy();
explorer = folderStrategy; //fileTypeStrategy is default strategy
// Create the display ConcreteObservers
folderList = new FolderListView();
fileTypeList = new FileTypeListView();
//Create the visualization strategy
pieChart = new PieGraphAdapter();
barChart = new BarGraphAdapter();
// Subscribe ConcreteObserver objects to ExploringStrategy objects
// so when the explorer finish its exploration it
// will notify all the subscribers.
folderList.SubscribeToDescoverEvent(folderStrategy);
fileTypeList.SubscribeToDescoverEvent(fileTypeStrategy);
pieChart.SubscribeToDescoverEvent(folderStrategy);
pieChart.SubscribeToDescoverEvent(fileTypeStrategy);
barChart.SubscribeToDescoverEvent(folderStrategy);
barChart.SubscribeToDescoverEvent(fileTypeStrategy);
// Select the first option in dropdown
comboActionStrategy.SelectedIndex = 0;
visualizationCombo.SelectedIndex = 1;
pieChart.AddToContainer(rightPanel);
this.visualizationCombo.SelectedIndexChanged += new EventHandler(this.comboObserver_SelectedIndexChanged);
this.comboActionStrategy.SelectedIndexChanged += new EventHandler(this.comboAction_SelectedIndexChanged);
this.treeView.AfterSelect += new TreeViewEventHandler(this.treeView_AfterSelect);
this.treeView.BeforeExpand += new TreeViewCancelEventHandler(this.treeView_BeforeExpand);
//calculate DescoverProgressEventHandler for both of strategies
folderStrategy.OnProgess += new DescoverProgressEventHandler(DisplayProgress);
fileTypeStrategy.OnProgess += new DescoverProgressEventHandler(DisplayProgress);
}
/// <summary>
/// This method is used for delegating observer update method which is belons to this class's update method
/// by DescoverStrategy Finished event.
/// </summary>
/// <param name="obj"></param>
public void SubscribeToDescoverEvent(DescoverStrategy obj)
{
obj.Finished += UpdateDraw;
}