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Our program now permits editing of nodes in the TreeView and items in the ListView. Editing is initiated with the menuLabelEdit menu or the F2 key, and is based on which control currently has the focus. In both update methods, note how the as keyword is used to convert the given object into both a TreeView and a ListView, as is shown in the following excerpt. The remainder of each method executes the appropriate statements based on which type of control is provided.

public MyClass(int x) { Val = x; } public int CompareTo(MyClass obj) { return Val - objVal; // Now, no cast is needed } }

ListViewItem item = obj as ListViewItem; TreeNode node = obj as TreeNode;

Notice that a cast is no longer required by this line in CompareTo( ):

Because the type parameter to IComparable is MyClass, the type of obj is now known to be MyClass Here is an updated version of IsIn( ) that requires IComparable<T>:

Also of note is our use of the FindNode method created earlier in the chapter as part of section 15.4.2. As you may recall, we included a parameter to this method that indicated whether to expand the selected node. We set this second parameter to false here to ensure that the contents of the tree view control are not altered. Our final change is to support the display of our album and photograph property dialogs from the TreeView control. 15.5.3 UPDATING THE PROPERTIES MENU In chapter 14 we created a Properties menu. We handled the Click event for this menu in a menuProperties_Click method, and created the DisplayAlbumProperties and DisplayPhotoProperties methods to display the two types of dialogs required. Here we would like to change the behavior of this menu to the following: When the TreeView has the focus, display the appropriate properties dialog if an album node or a photograph node is selected. When the ListView has the focus, display the appropriate properties dialog for the selected item. When the PictureBox has the focus, display the photograph properties dialog associated with the displayed image. To make this change, we will modify our Display methods to accept either a ListViewItem or a TreeNode object. The following table details the changes required.

// Require IComparable<T> interface public static bool IsIn<T>(T what, T[] obs) where T : IComparable<T> { foreach(T v in obs) if(vCompareTo(what) == 0) // now OK, uses CompareTo() return true; return false; }

Create the private void InitializeComponent() controls { this.btnLoad = new System.Windows.Forms.Button(); this.pbxPhoto = new System.Windows.Forms.PictureBox(); this.SuspendLayout(); Suspend layout logic // Control sections // btnLoad // this.btnLoad.Location = new System.Drawing.Point(16, 16); this.btnLoad.Name = "btnLoad"; Set standard this.btnLoad.TabIndex = 0; control this.btnLoad.Text = "&Load"; settings // // pbxPhoto // this.pbxPhoto.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D; this.pbxPhoto.Location = new System.Drawing.Point(40, 80); this.pbxPhoto.Name = "pbxPhoto"; this.pbxPhoto.Size = new System.Drawing.Size(216, 160); this.pbxPhoto.TabIndex = 1; Set control this.pbxPhoto.TabStop = false; location // and size // MainForm // this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(292, 273); this.Controls.AddRange(new System.Windows.Forms.Control[] { this.pbxPhoto, this.btnLoad}); this.Name = "MainForm"; Add controls this.Text = "MyPhotos 2.2"; to form this.ResumeLayout(false); Resume

applied to instances of that type parameter, but they only test for reference equality To compare values, you must implement IComparable or IComparable<T>

Generic classes can be part of a class hierarchy in just the same way as non-generic classes Thus, a generic class can act as a base class or be a derived class The key difference between generic and non-generic hierarchies is that in a generic hierarchy, any type arguments needed by a generic base class must be passed up the hierarchy by all derived classes This is similar to the way that constructor arguments must be passed up a hierarchy

A couple of points here are worth highlighting. The numbers from the previous code excerpt match the numbers in the following list. As we saw in chapter 1, control variables are classes and therefore represent reference types. In order to create an actual object for each control, the new keyword is used.

Here is a simple example of a hierarchy that uses a generic base class:

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this.btnLoad = new System.Windows.Forms.Button(); this.pbxPhoto = new System.Windows.Forms.PictureBox();

// A simple generic class hierarchy using System; // A generic base class class Gen<T> { T ob; public Gen(T o) { ob = o; } // Return ob public T GetOb() {

Part I: