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LIST CONTROLS
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ENABLE MULTIPLE SELECTIONS IN THE LIST BOX (continued) Action 3 Set the Enabled property for the four buttons in the Photographs group box to false.
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Result The code in the InitializeComponent method for all four buttons is modified so that their Enabled properties are set to false.
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btnMoveUp.Enabled = false; . . . btnMoveDown.Enabled = false; . . .
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a. Click the first button. b. Hold down the Ctrl key and click the other buttons so that all four buttons are highlighted. c. Display the Properties window. d. Set the Enabled item to False. Note: This technique can be used to set a common property for any set of controls on a form to the same value. 4 Rewrite the UpdateList method to add each item to the list manually. Note: The BeginUpdate method prevents the list box from drawing the control while new items are added. This improves performance and prevents the screen from flickering.
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This allows us to manipulate and modify the individual items in the list, which is prohibited when filling the list with the DisplaySource property.
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private void UpdateList() { lstPhotos.BeginUpdate(); lstPhotos.Items.Clear(); foreach (Photograph photo in _album) { lstPhotos.Items.Add(photo); } lstPhotos.EndUpdate(); } private void lstPhotos_SelectedIndexChanged (object sender, System.EventArgs e) { int numSelected = lstPhotos.SelectedIndices.Count;
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Handle the SelectedIndexChanged event for the ListBox control.
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This is the default event for all list controls, so simply double-click on the control. 6 Implement this handler to enable or disable the buttons in the Photographs group box based on the number of items selected in the list box. Note: The Move Up button should be disabled if the first item is selected. The Move Down button should be disabled if the last item is selected. The GetSelected method is used to determine if a given index is currently selected.
bool someSelected = (numSelected > 0); btnMoveUp.Enabled = (someSelected && !lstPhotos.GetSelected(0)); btnMoveDown.Enabled = (someSelected && (!lstPhotos.GetSelected( lstPhotos.Items.Count - 1))); btnRemove.Enabled = someSelected; btnPhotoProp.Enabled = (numSelected == 1); }
MULTISELECTION LIST BOXES
You can compile and run this code if you like. Our new buttons do not do anything, but you can watch them become enabled and disabled as you select items in a newly opened album. We assigned the MultiExtended selection mode setting to the ListBox.SelectionMode property, which permits selecting a range of items using the mouse or keyboard. This is one of four possible values for the SelectionMode enumeration, as described in .NET Table 10.3.
TRY IT!
Change the list box selection mode to MultiSimple and run your program to see how the selection behavior differs between this and the MultiExtended mode.
Our next task will be to provide an implementation for these buttons. We will pick up this topic in the next section. 10.2.2 HANDLING THE MOVE UP AND MOVE DOWN BUTTONS Now that our list box allows multiple selections, we need to implement our three buttons that handle these selections from the list. This will permit us to discuss some collection and list box methods that are often used when processing multiple selections in a list. We will look at the Move Up and Move Down buttons first. There are two problems we need to solve. The first is that our PhotoAlbum class does not currently provide an easy way to perform these actions. We will fix this by adding two methods to our album class for this purpose.
.NET Table 10.3 SelectionMode enumeration
The SelectionMode enumeration specifies the selection behavior of a list box control, such as the ListBox and CheckedListBox classes. This enumeration is part of the System.Windows.Forms namespace. None One MultiSimple Items cannot be selected. A single item can be selected using a mouse click or the space bar key. Multiple items can be selected. Items are selected or deselected using a mouse click or the space bar. Multiple items can be selected. This extends simple selection to permit a range of items to be selected using a drag of the mouse or the Shift, Ctrl, and arrow keys.
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