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{ get { if (_album == null) { _album = new PhotoAlbum(); _album.Open(_fileName); } return _album; } } // Other methods as required . . . }
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For our purposes the use of a simple string value in the Tag property was sufficient to display the album s properties dialog. Another feature worth supporting here is the ability to edit item labels. 14.4.2 SUPPORTING LABEL EDITS Editing an item label in place is one of the advantages the ListView class has over ListBox objects. In our application it would be nice if the user could edit the album name in order to rename an album file. This section will show how to support this feature. Label editing is disabled by default, and turned on by setting the LabelEdit property to true. An actual edit of an item is initiated by the BeginEdit method of the ListViewItem class. The corresponding ListView control receives two events during the editing process. The BeforeLabelEdit event occurs before the edit process begins, while the AfterLabelEdit event occurs when the user completes the edit by pressing the Enter key or clicking outside of the edit area. Event handlers for both events receive the LabelEditEventArgs class as their event handler. See .NET Table 14.7 for an overview of this class. We will allow an item to be edited in two ways. The first way is through a Name menu under the top-level Edit menu, and the second way is by selecting an item and pressing the F2 key. This matches the keyboard shortcut supported by Windows Explorer, so it seems appropriate here. In a production environment, we would probably handle both events in our application. In the BeginLabelEdit event handler we would make sure the album is valid and can be successfully opened. This provides some assurance that the edit will be successful before the user begins typing. The AfterLabelEdit event handler would update the album with a new title and store the album to disk. It would also update the album file on disk with the change.
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.NET Table 14.7 LabelEditEventArgs class
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The LabelEditEventArgs class represents the event arguments received by BeforeLabelEdit and AfterLabelEdit event handlers for the ListView class. This class is part of the System.Windows.Forms namespace, and inherits from the System.EventArgs class. CancelEdit Public Properties Gets or sets whether the edit operation should be cancelled. This property can be set both before and after the item is edited. Gets the zero-based index into the list view s Items collection of the ListViewItem to be edited. Gets the new text to assign to the label of the indicated item.
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Item Label
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Since we are not in a production environment, we will take the easy way out and only handle the AfterLabelEdit event. This means a user may edit an album only to find that he or she cannot save his changes, which is not the best interface from a usability perspective. The code changes required are given in the following steps:
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INITIATE LABEL EDITING Action 1 In the MainForm.cs [Design] window, set the LabelEdit property of the ListView control to true. Add a Name menu to the top of the Edit menu.
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Settings Property (Name) Text Value menuEditLabel &Name private void menuEditLabel_Click (object sender, System.EventArgs e) { if (listViewMain.SelectedItems.Count == 1) listViewMain.SelectedItems[0].BeginEdit(); }
Result Item labels in the list view may now be edited.
Add a Click event handler for this menu. Within this handler, if an item is selected, edit the item.
Note: This code only edits the label if a single item is selected. While we do not permit multiple items to be selected in our ListView control, this code establishes an appropriate behavior in case such selection is ever permitted in the future. 5 Add a KeyDown event handler for the ListView control.
private void listViewMain_KeyDown (object sender, System.Windows. Forms.KeyEventArgs e) {
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