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CHAPTER 35 WINDOWS FORMS
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This class is fairly simple. The constructor for the class calls InitializeComponent(), which is the member that the class designer will use. Initially, all it has is a container for the other items on the form and lines to set the size and text of the form. A Dispose() member will clean up the form when it closes.1 Finally, the Main() function for the whole application creates an instance of the form class and then calls Application.Run(), passing the form. This will execute the standard Windows message loop to get messages and dispatch them to the appropriate objects.
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The VS .NET environment makes laying out forms easy. You can view the Toolbox by clicking the Toolbox tab along the left side of the development environment. Selecting Windows Forms will show all the controls you can place on a form. The directories you want to show make the TreeView a good choice, so drag one onto your form. The designer will show you the TreeView object and add the following code to the InitializeComponent() method: this.treeView1 = new treeView1.Location = treeView1.Size = new treeView1.TabIndex = System.Windows.Forms.TreeView (); new System.Drawing.Point (200, 112); System.Drawing.Size (121, 97); 0;
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You ll want the TreeView control to take up all the space in the form. You can do this by resizing the control when the size of the form changes, but the Windows Forms architecture can do this for you. If the TreeView object is selected, you can set the Anchor property in the property window. Initially, the object is anchored to the top-left corner; by setting the anchor to all four sides, you can resize the tree view whenever the form is resized. We ve used anchoring in this case, but since this form has only a single object, you could achieve the same effect by setting the Dock property on the TreeView to DockStyle.Fill. Now that the basic framework of the application is ready, it s time to move onto some disk operations.
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The base of DiskDiff is the code that can traverse a directory tree and figure out the sizes of the files there. A quick look in the System.IO namespace shows a DirectoryInfo class that will work. You ll encapsulate it in a class of your own so you can store the list of files and the list of directories in each directory. The class will look like this:
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1. Forms use system resources that the garbage collector can t track, so you can call the Dispose() method to clean these up before the garbage collector gets around to the next collection. See 8 for more information on Dispose().
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CHAPTER 35 WINDOWS FORMS
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public class DirectoryNode { string root; List<FileNode> files = new List<FileNode>(); List<DirectoryNode> dirs = new List<DirectoryNode>(); DirectoryInfo directoryInfo; // this directory public DirectoryNode(string root) { this.root = root; directoryInfo = new DirectoryInfo(root); } public DirectoryNode(DirectoryInfo directoryInfo) { this.directory = directoryInfo; this.root = directoryInfo.FullName; } public void Populate() { foreach (FileInfo f in directoryInfo.GetFiles()) { FileNode fileNode = new FileNode(f); this.files.Add(f); } foreach (DirectoryInfo d in directory.GetDirectories()) { DirectoryNode dirNode = new DirectoryNode(d.FullName); dirs.Add(dirNode); dirNode.Populate(); } } public void PrintTree(int level) { for (int i = 0; i < level; i++) { Console.Write(" "); } Console.WriteLine("{0}", this.root); foreach (DirectoryNode dirNode in dirs) { dirNode.PrintTree(level + 1); } } }
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CHAPTER 35 WINDOWS FORMS
DirectoryNode has two constructors. The first creates the top-level directory, and the other creates a DirectoryNode from a DirectoryInfo object. The Populate() function is the heart of the class. It uses the DirectoryInfo object that s encapsulated, calling GetFiles() to get the list of files in the directory and GetDirectories() to get the list of directories. It then recurses for each subdirectory, so the directory tree can be fully traversed. The PrintTree() function is used for testing, along with a little test program: class Test { public static void Main() { DirectoryNode directoryNode = new DirectoryNode(@"c:\project\diskdiff"); directoryNode.Populate(); directoryNode.PrintTree(0); } } On our system, this gives the following output: c:\project\diskdiff c:\project\diskdiff\bin c:\project\diskdiff\bin\Debug c:\project\diskdiff\obj c:\project\diskdiff\obj\Debug c:\project\diskdiff\obj\Debug\temp c:\project\diskdiff\obj\Debug\TempPE
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