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The following steps detail the changes required to display our two dialogs.
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DISPLAY THE PROPERTY DIALOGS Action 1 In the MainForm.cs [Design] window, add two buttons to the form as shown in the graphic.
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Settings Button Property album (Name) Anchor Text photo (Name) Anchor Text Value btnAlbumProp Top, Right Propertie&s btnPhotoProp Top, Right Properti&es
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Add a Click event handler for album s Properties button.
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a. Within this handler, display an Album Properties dialog box for the current album. b. If the user modifies the properties, mark the album as changed and update the list.
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private void btnAlbumProp_Click (object sender, System.EventArgs e) { using (AlbumEditDlg dlg = new AlbumEditDlg(_album)) { if (dlg.ShowDialog() == DialogResult.OK) { _bAlbumChanged = true; UpdateList(); } } } private void btnPhotoProp_Click (object sender, System.EventArgs e) { if (_album.Count == 0) return; if (lstPhotos.SelectedIndex >= 0) { _album.CurrentPosition = lstPhotos.SelectedIndex; } using (PhotoEditDlg dlg = new PhotoEditDlg(_album)) { if (dlg.ShowDialog() == DialogResult.OK) { _bAlbumChanged = true; UpdateList(); } } }
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Add a Click event handler for the photograph s Properties button to display the PhotoEditDlg form.
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How-to
a Within the handler, if the album is empty then simply return. b. Set the current position in the album to the selected photograph. c. Display a Photo Properties dialog box for the photograph at the current position. d. If the user modifies the properties, mark the album as changed and update the list.
LIST CONTROLS
DISPLAY THE PROPERTY DIALOGS (continued) Action 4 Also display the photograph s properties when the user double-clicks on the list.
How-to
Result
private void lstPhotos_DoubleClick (object sender, System.EventArgs e) { btnPhotoProp.PerformClick(); }
Handle the DoubleClick event for the ListBox control.
In the code to display the Photograph Properties dialog, note how the SelectedIndex property is used. If no items are selected, then SelectedIndex will contain the value 1, and the current position in the album is not modified. When a photograph is actually selected, the current position is updated to the selected index. This assignment relies on the fact that the order of photographs in the ListBox control matches the order of photographs in the album itself.
if (lstPhotos.SelectedIndex >= 0) _album.CurrentPosition = lstPhotos.SelectedIndex;
For both dialogs, a C# using block ensures that any resources used by the dialog are cleaned up when we are finished. We also call UpdateList to update our application with any relevant changes made. In fact, neither property dialog permits any changes that we would display at this time. Even so, updating the list is a good idea in case we add such a change in the future. Compile and run your application to ensure that the dialog boxes display correctly. Note how easily we reused these dialogs in our new application. Make some changes and then reopen an album to verify that everything works as you expect. One minor issue with our application occurs when the album is empty. When a user clicks the photo s Properties button, nothing happens. This is not the best user interface design, and we will address this fact in the next section. So far our application only allows a single item to be selected at a time. List boxes can also permit multiple items to be selected simultaneously a topic we will examine next.
MULTISELECTION LIST BOXES
So far we have permitted only a single item at a time to be selected from our list. In this section we enable multiple item selection, and add some buttons to perform various actions based on the selected items. Specifically, we will add Move Up and Move Down buttons to alter the position of the selected photographs, and a Remove button to delete the selected photographs from the album.
Enabling multiple selection Enabling the ListBox to allow multiple selections simply requires setting the right property value, namely the SelectionMode property, to the value MultiSimple or MultiExtended. We discuss this property in detail later in the section. 325
MULTISELECTION LIST BOXES
Whenever you enable new features in a control, in this case enabling multiple selection in our list box, it is a good idea to review the existing functionality of the form to accommodate the new feature. In our case, what does the Properties button in the Photographs group box do when more than a single item is selected While we could display the properties of the first selected item, this seems rather arbitrary. A more logical solution might be to disable the button when multiple items are selected. This is, in fact, what we will do here. Since the Properties button will be disabled, we should probably have some other buttons that make sense when multiple items are selected. We will add three buttons. The first two will move the selected items up or down in the list as well as within the corresponding PhotoAlbum object. The third will remove the selected items from the list and the album. The steps required are shown in the following table:
Set the version number of the MyAlbumEditor application to 10.2. ENABLE MULTIPLE SELECTIONS IN THE LIST BOX Action 1 In the MainForm.cs [Design] window, modify the SelectionMode property for the list box to be MultiExtended. Add three new buttons within the Photographs group box as shown in the graphic.
Settings Button Move Up Property (Name) Anchor Text Move Down (Name) Anchor Text Remove (Name) Anchor Text Value btnMoveUp Top, Right Move &Up btnMoveDown Top, Right Move &Down btnRemove Top, Right &Remove
Result This permits multiple items to be selected similarly to how files can be selected in Windows Explorer.
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