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The second problem is that if we move an item, then the index value of that item changes. For example, if we want to move items 3 and 4 down, then item 3 should move to position 4, and item 4 to position 5. As illustrated in figure 10.3, if we first
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move item 3 down, it becomes item 4. If you then move item 4 down, you would effectively move the original item 3 into position 5.
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Figure 10.3 When the third item in the list is moved down, the original fourth item moves into position 3.
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The trick here, as you may realize, is to move item 4 first, and then move item 3. In general terms, to move multiple items down, we must move the items starting from the bottom. Conversely, to move multiple items up, we must start at the top. We will begin with the new methods required in the PhotoAlbum class.
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Set the version number of the MyPhotoAlbum library to 10.2. IMPLEMENT MOVE METHODS IN PHOTOALBUM CLASS Action 1 In the PhotoAlbum.cs window, add a
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MoveBefore method to move a
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public void MoveBefore(int i) { if (i > 0 && i < this.Count) { Photograph photo = this[i]; this.RemoveAt(i); this.Insert(i-1, photo); } }
photograph at a specified index to the previous position.
How-to
a. Ensure the given index is valid. b. Remove the Photograph at this index from the list. c. Insert the removed photograph at the new position. 2 Add a MoveAfter method to move a photograph at a specified index to the subsequent position.
public void MoveAfter(int i) { if (i >= 0 && i < this.Count-1) { Photograph photo = this[i]; this.RemoveAt(i); this.Insert(i+1, photo); } }
With these methods in place, we are ready to implement Click event handlers for our Move Up and Move Down buttons. These handlers are shown in the following steps:
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HANDLE THE MOVE BUTTONS Action 3 Implement a Click event handler for the Move Up button. Note: We could have used a
foreach loop over the indices
Result
private void btnMoveUp_Click (object sender, System.EventArgs e) { ListBox.SelectedIndexCollection indices = lstPhotos.SelectedIndices; int[] newSelects = new int[indices.Count]; // Move the selected items up for (int i = 0; i < indices.Count; i++) { int index = indices[i]; _album.MoveBefore(index); newSelects[i] = index - 1; } _bAlbumChanged = true; UpdateList(); // Reset the selections. lstPhotos.ClearSelected(); foreach (int x in newSelects) { lstPhotos.SetSelected(x, true); } }
array here. This was written as a
for loop to be consistent with
the implementation of the Move Down handler.
Implement the Click handler for the Move Down button.
private void btnMoveDown_Click (object sender, System.EventArgs e) { ListBox.SelectedIndexCollection indices = lstPhotos.SelectedIndices; int[] newSelects = new int[indices.Count]; // Move the selected items down for (int i = indices.Count - 1; i >= 0; i--) { int index = indices[i]; _album.MoveAfter(index); newSelects[i] = index + 1; } _bAlbumChanged = true; UpdateList(); // Reset the selections. lstPhotos.ClearSelected(); foreach (int x in newSelects) { lstPhotos.SetSelected(x, true); } }
Both of these methods employ a number of members of the ListBox class. Let s examine the Move Down button handler in detail as a way to discuss these changes.
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private void btnMoveDown_Click(object sender, System.EventArgs e) { ListBox.SelectedIndexCollection indices = lstPhotos.SelectedIndices; int[] newSelects = new int[indices.Count]; // Move the selected items down for (int i = indices.Count - 1; i >= 0; i--) { int index = indices[i]; _album.MoveAfter(index); newSelects[i] = index + 1; } _bAlbumChanged = true; UpdateList();
Retrieve the selected items
Move selected items down
Update the list box
// Reset the selections. lstPhotos.ClearSelected(); foreach (int x in newSelects) { lstPhotos.SetSelected(x, true); } }
Reselect the items
c d e
The following points are highlighted in the code: A local indices variable is created to hold the index values of the selected items. The SelectedIndices property returns a ListBox.SelectedIndexCollection instance containing an array of the selected index values. The related SelectedItems property returns the actual objects selected. Note that an array of integers is also created to hold the new index positions of the objects after they have been moved. Starting from the bottom of the list, each selected item is moved down in the album. Note that the MoveDown button is disabled if the last item is selected, so we know for certain that index + 1 will not produce an index which is out of range. Once all the changes have been made to our album, we update the list box with the new entries. Note that the UpdateList method has a side effect of clearing the current selections from the list. Once the list has been updated, the items need to be reselected. The newSelects array was created for this purpose. The ClearSelected method is used to remove any default selections added by the UpdateList method, and the SetSelected method is used to select each entry in the array. You can run the application here if you like to see how these buttons work. The next section discusses the Remove button implementation.
HANDLING THE REMOVE BUTTON The Remove button is a bit like the Move Down button. We have to be careful that the removal of one item does not cause us to remove incorrect entries on subsequent 331
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