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CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
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public void Load() { try { if (!File.Exists(persistentFilePath)) return; XmlDocument xmlDoc = new XmlDocument(); xmlDoc.Load(persistentFilePath); XmlNode node = xmlDoc.SelectSingleNode("//ShowFolders"); if (node == null) return; showFoldersNavigator = Boolean.Parse(node.InnerText.ToString()); } catch (Exception ex) { MessageBox.Show(ex.ToString(), "Couldn't load settings"); } } } Listing 11-10. The VB .NET Implementation of UserSettings Public Class UserSettings Private _persistentFilePath As String ' ShowFolders if true, ShowSearch if false Private _showFoldersNavigator As Boolean Public Property ShowFoldersNavigator() As Boolean Get Return _showFoldersNavigator End Get Set(ByVal Value As Boolean) _showFoldersNavigator = Value End Set End Property Public Sub ShowFolders() ShowFoldersNavigator = True End Sub Public Sub ShowSearch() ShowFoldersNavigator = False End Sub Public Sub New() _persistentFilePath = String.Format("{0}\settings.xml", Application.StartupPath) ' set default values for all settings (we only have one!) ShowFoldersNavigator = True End Sub Public Sub Save() Try Dim writer As New StreamWriter(_persistentFilePath) writer.WriteLine("< xml version='1.0' encoding='UTF-8' >") writer.WriteLine("<settings>")
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CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
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writer.WriteLine(String.Format("<ShowFolders>{0}</ShowFolders>", _ ShowFoldersNavigator)) writer.WriteLine("</settings>") writer.Close() Catch ex As Exception MessageBox.Show(ex.ToString(), "Couldn't save settings") End Try End Sub Public Sub Load() Try If Not File.Exists(_persistentFilePath) Then Return Dim xmlDoc As New XmlDocument xmlDoc.Load(_persistentFilePath) Dim node As XmlNode = xmlDoc.SelectSingleNode("//ShowFolders") If node Is Nothing Then Return ShowFoldersNavigator = Boolean.Parse(node.InnerText.ToString()) Catch ex As Exception MessageBox.Show(ex.ToString(), "Couldn't load settings") End Try End Sub End Class
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The Folders Navigator
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The Folders navigator is a UI control that shows the folders (directories) of the local C: hard drive. The navigator, implemented in a class called NavigatorFolders, exposes two methods: Populate and SelectFolder. The former displays the top-level directories on the C: drive and is called at startup time. The latter populates the selected folder with subfolders. When a folder is displayed, the system must already know if it has subfolders, so the Populate method searches for root-level folders and for their immediate subfolders. Why Because folders that have subfolders must show a + sign, which users can click to see the subfolders. CoordinatorStartup calls the Populate method, using a transparent interaction with pushed feedback, described in the sequence diagram in Figure 11-13.
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CoordinatorStartup
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NavigatorFolders
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Run()
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Populate()
UpdateProgress()
Updates Are Sent While Populate Is Running.
Figure 11-13. Finding the root-level folders of the C: drive at startup time
CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
The feedback path is a bit unusual, because instead of going to the Coordinator, it goes to a different object (the splash screen). The feedback would need to go to the Coordinator if the feedback originated on a background thread, or if multiple objects needed to be managed on each progress update. If the feedback originated on a background thread, the Coordinator would be responsible for switching to the UI thread before forwarding the feedback to the rest of the system. Since SystemBrowser runs the Populate method on the UI thread, and no other objects besides the splash screen are involved in the progress-update processing, the feedback can go directly to the splash screen. When the startup process is complete, SystemBrowser comes up showing the populated Folders navigator. Listing 11-11 and Listing 11-12 show C# and VB .NET implementations of NavigatorFolders. Listing 11-11. The C# Implementation of NavigatorFolders public class NavigatorFolders : System.Windows.Forms.UserControl { string folderSelected; // ImageList indexes const int ImageFolder = 0; const int ImageFolderOpened = 1; const int ImageHardDrive = 2; public NavigatorFolders() { // This call is required by the Windows.Forms Form Designer. InitializeComponent(); } public void Populate(string theFolder) { Cursor = Cursors.WaitCursor; treeViewFolders.BeginUpdate(); treeViewFolders.Nodes.Clear(); int percentComplete = 0; // strip off trailing backslash string name = theFolder; if (name.EndsWith(@"\")) name = name.Substring(0, name.Length-1); TreeNode rootNode = new TreeNode(name, ImageHardDrive, ImageHardDrive); rootNode.Tag = theFolder; // save the directory's full path treeViewFolders.Nodes.Add(rootNode); int i = 0; string[] directories = Directory.GetDirectories(theFolder); int totalFiles = directories.Length; foreach (string directory in directories) { AddNode(rootNode.Nodes, directory); percentComplete = (i * 100 ) / totalFiles; FireProgress(percentComplete); i++; }
CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
treeViewFolders.EndUpdate(); rootNode.Expand(); FireProgress(100); Cursor = Cursors.Default; } public void SelectFolder(string thePath) { if (thePath == null) return; if (treeViewFolders.Nodes.Count == 0) return; if (thePath.EndsWith("\\")) { // root folder treeViewFolders.SelectedNode = treeViewFolders.Nodes[0]; return; } string[] directories = thePath.Split(new char[] {'\\'}); TreeNode node = treeViewFolders.Nodes[0]; foreach (string directory in directories) { node = FindNodeFor(node, directory); if (node == null) return; } AddChildren(node); treeViewFolders.SelectedNode = node; } public void SelectParentFolder() { TreeNode currentNode = treeViewFolders.SelectedNode; if (currentNode == null) return; string currentDirectory = currentNode.Tag as string; DirectoryInfo parentDirectory = Directory.GetParent(currentDirectory); if (parentDirectory == null) return; SelectFolder(parentDirectory.FullName); } #region Component Designer generated code // #endregion void AddNode(TreeNodeCollection theParentCollection, string theDirectory) { string name = Path.GetFileName(theDirectory); TreeNode node = new TreeNode(name, ImageFolder, ImageFolderOpened); node.Tag = theDirectory; // save the directory's full path theParentCollection.Add(node);
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