Action

1

In the MainForm.cs code

private void menuProperties_Click

window, update the

(object sender, System.EventArgs e)

menuProperties_Click event

{

if (treeViewMain.Focused)

handler to accommodate the

{

three controls that might have

TreeNode node = treeViewMain.SelectedNode;

the focus.

string file = node.Tag as string;

if (node == null || node.Parent == null

How-to

|| file == null)

a. For the TreeView control,

return;

// do nothing

ignore the parent node and

if (Path.GetExtension(file) == ".abm")

call the appropriate Proper-

DisplayAlbumProperties(node);

ties method based on the

else

node type.

DisplayPhotoProperties(node);

}

b. For the PictureBox control,

else if (pictureBoxMain.Focused)

call the DisplayPhoto-

{

Properties method on the

// Display photograph for this image

TreeNode node = treeViewMain.SelectedNode;

selected photo node.

if (node != null)

c. For the ListView control,

DisplayPhotoProperties(node);

the code is the same as in

}

else

chapter 14.

if (listViewMain.SelectedItems.Count > 0)

{

ListViewItem item

= listViewMain.SelectedItems[0];

if (this._albumsShown)

DisplayAlbumProperties(item);

else

DisplayPhotoProperties(item);

}

}

2

Rewrite the DisplayAlbum-

private void DisplayAlbumProperties

Properties method to accept

(object obj)

an object instance.

{

ListViewItem item = obj as ListViewItem;

How-to

TreeNode node = obj as TreeNode;

a. Convert the given object to

// Open the album as appropriate

a ListViewItem and a

PhotoAlbum album = null;

TreeNode instance.

if (item != null)

b. Open the PhotoAlbum using

{

string fileName = item.Tag as string;

whichever object is not

if (fileName != null)

null.

album = this.OpenAlbum(fileName);

c. If the album could not be

}

else if (node != null)

opened, display an error

{

message.

album = OpenTreeAlbum(node);

}

if (album == null)

. . . // as in chapter 14

Action

Result

3

When displaying the album edit

using (AlbumEditDlg dlg

dialog, only update the list item

= new AlbumEditDlg(album))

settings if the given item is a list

{

if (dlg.ShowDialog() == DialogResult.OK)

view item.

{

Note: If the given item is a tree

// Save changes made by the user

. . .

node, then photographs are dis-

// Update item settings

played in the list view, and

if (item != null)

these settings should not be

{

updated.

item.SubItems[MainForm.

AlbumTitleColumn].Text

= album.Title;

bool hasPwd = (album.Password != null)

&& (album.Password.Length > 0);

item.SubItems[MainForm.

AlbumPwdColumn].Text

= (hasPwd ? "y" : "n");

}

}

}

album.Dispose();

}

4

Modify the

private void DisplayPhotoProperties

DisplayPhotoProperties

(object obj)

{

method to accept an object

ListViewItem item = obj as ListViewItem;

instance.

TreeNode node = obj as TreeNode;

How-to

int index = 0;

This is similar, at least in spirit, to

if (item != null && (item.Tag is int))

the DisplayAlbumProperties

{

method.

index = item.Tag;

}

else if (node != null)

{

index = node.Index;

}

_album.CurrentPosition = index;

Action

Result

5

After displaying the dialog,

using (PhotoEditDlg dlg

update the list or node with any

= new PhotoEditDlg(_album))

modified photograph settings.

{

if (dlg.ShowDialog() == DialogResult.OK)

Note: Recall that our photo edit

{

dialog permits all photographs

// Save any changes made

. . .

in an album to be updated. As a

// Update controls with new settings

result, when the photographs

TreeNode baseNode = null;

are shown in the tree node, the

if (item != null)

label for each related node must

{

LoadPhotoData(_album);

be updated as well. This is true

baseNode = treeViewMain.SelectedNode;

regardless of the type object

}

given.

else if (node != null)

{

baseNode = node.Parent;

}

if (baseNode != null)

{

// Update all child labels

foreach (TreeNode n in baseNode.Nodes)

{

n.Text = _album[n.Index].Caption;

}

}

}

}

}