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The NodeLabelEditEventArgs class represents the event data associated with the BeforeLabelEdit and AfterLabelEdit events in the TreeView class. This class is part of the System.Windows.Forms namespace, and inherits from the System.EventArgs class. CancelEdit Gets or sets whether the edit operation should be cancelled. This property can be set both before and after the node is edited. Gets the new text to assign to the label of the indicated node. Gets the TreeNode object being edited.

class ByTwos : ISeries<T> { // Wrong!

In our application, we will permit nodes to be edited using the menuEditLabel menu item, or by pressing the F2 key when a tree node is selected and the tree view has the focus. The following table details the steps required for this change:

The type argument required by the ISeries interface must be passed to ByTwos Otherwise, there is no way for the interface to receive the type argument Next, the current value of the series, val, and the starting value, start, are declared to be objects of the generic type T Then, a delegate called IncByTwo is declared This delegate defines the form of a method that will be used to increase an object of type T by two In order for ByTwos to work with any type of data, there must be some way to define what an increase by two means for each type of data This is achieved by passing to the ByTwos constructor a reference to a method that performs an increase by two This reference is stored in incr When the next element in the series is needed, that method is called through the incr delegate to obtain the next value in the series Notice the class ThreeD It encapsulates three-dimensional (X,Z,Y) coordinates It is used to demonstrate ByTwos on a class type In GenIntfDemo, three increment methods are declared; one for int, one for double, and one for objects of type ThreeD These are passed to the ByTwos constructor when objects of their respective types are created Pay special attention to ThreeDPlusTwo( ), shown here:

// Define plus two for ThreeD static ThreeD ThreeDPlusTwo(ThreeD v) { if(v==null) return new ThreeD(0, 0, 0); else return new ThreeD(vx + 2, vy + 2, vz + 2); }

SUPPORT EDITING OF TREE NODE LABELS Action 1 Set the LabelEdit property for the TreeView control to true in the MainForm.cs [Design] window. Handle the KeyDown event for the TreeView control to initiate a label edit when the F2 key is pressed in the tree control. Result Tree node labels may now be edited.

Notice that it first checks if v is null If it is, then it returns a new ThreeD object in which all fields are set to zero The reason for this is that v is set to default(T) by the ByTwos constructor This value is zero for value types and null for object types Thus, (unless SetStart( ) has been called) for the first increment, v will contain null instead of a reference to an object This means that for the first increment, a new object is required

private void treeViewMain_KeyDown (object sender, System.Windows. Forms.KeyEventArgs e) { if (e.KeyCode == Keys.F2) { if (treeViewMain.SelectedNode != null) { treeViewMain.SelectedNode.BeginEdit(); e.Handled = true; } } } private void menuEdit_Popup (object sender, System.EventArgs e) { if (treeViewMain.Focused) { menuEditLabel.Enabled = (treeViewMain.SelectedNode != null); menuEditLabel.Text = "&Node"; } else // assume ListView has focus { menuEditLabel.Enabled = (listViewMain.SelectedItems.Count > 0); if (this._albumsShown) menuEditLabel.Text = "&Name"; else menuEditLabel.Text = "&Caption"; } }

Part I:

12:

A type parameter for a generic interface can have constraints in the same way as it can for a generic class For example, this version of ISeries restricts its use to reference types:

Update the menuEdit_Popup event handler to use the text Node for the menuEditLabel menu when the TreeView has the focus.

public interface ISeries<T> where T : class {

SUPPORT EDITING OF TREE NODE LABELS (continued) Action 4 Update the menuEditLabel_Click event handler to edit the appropriate item based on the current focus. Result

When this version of ISeries is implemented, the implementing class must also specify the same constraint for T, as shown here:

class ByTwos<T> : ISeries<T> where T : class {