CancelEdit

Gets or sets whether the edit operation should

be cancelled. This property can be set both

before and after the node is edited.

Public Properties

Label

Gets the new text to assign to the label of the

indicated node.

Node

Gets the TreeNode object being edited.

Action

Result

1

Set the LabelEdit property for

Tree node labels may now be edited.

the TreeView control to true

in the MainForm.cs [Design]

window.

2

Handle the KeyDown event for

private void treeViewMain_KeyDown

the TreeView control to initiate

(object sender, System.Windows.

a label edit when the F2 key is

Forms.KeyEventArgs e)

{

pressed in the tree control.

if (e.KeyCode == Keys.F2)

{

if (treeViewMain.SelectedNode != null)

{

treeViewMain.SelectedNode.BeginEdit();

e.Handled = true;

}

}

}

3

Update the menuEdit_Popup

private void menuEdit_Popup

event handler to use the text

(object sender, System.EventArgs e)

“Node” for the

{

if (treeViewMain.Focused)

menuEditLabel menu when

{

the TreeView has the focus.

menuEditLabel.Enabled

How-to

= (treeViewMain.SelectedNode != null);

menuEditLabel.Text = "&Node";

Use the Focused property for

}

the TreeView class.

else // assume ListView has focus

{

menuEditLabel.Enabled

= (listViewMain.SelectedItems.Count > 0);

if (this._albumsShown)

menuEditLabel.Text = "&Name";

else

menuEditLabel.Text = "&Caption";

}

}

Action

Result

7

Rename the file.

// Rename the file

How-to

string newFileName = null;

if (fileName != null)

Use the RenameFile method

{

from chapter 14.

newFileName

= RenameFile(fileName, newName, ".abm");

}

if (newFileName == null)

{

MessageBox.Show("Unable to rename album "

+ "to this name.");

return false;

}

8

Update the Tag property for the

// Update the appropriate Tag property

appropriate object.

if (item != null)

Note: When the object is a list

{

item.Tag = newFileName;

item, this updates the corre-

if (node != null)

sponding node as well.

node.Text = newName;

}

else if (node != null)

node.Tag = newFileName;

return true;

}

9

Rewrite the UpdatePhoto-

private bool UpdatePhotoCaption

Caption method to accom-

(string caption, object obj)

modate both list items and tree

{

ListViewItem item = obj as ListViewItem;

nodes.

TreeNode node = obj as TreeNode;

How-to

// Determine the album index

a. Change the second param-

int index = -1;

eter to an object rather

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

than a ListViewItem.

{

index = (int)item.Tag;

b. Convert the given object

node = FindNode(_album[index].FileName,

to both a list item and a

false);

tree node.

}

else if (node != null)

c. Determine the album index

{

for the appropriate object.

index = node.Index;

d. If the object is a list view

}

item, also find the node

corresponding to this item.

10

Return false if the caption

if ((caption.Length == 0) || (index < 0))

cannot be updated.

{

MessageBox.Show("Invalid caption value.");

return false;

}

Action

Result

11

Update the photograph’s

// Update caption

caption, and save the changes

_album[index].Caption = caption;

to the album.

if (item != null && node != null)

{

Note: When the object is a list

// Update node text as well

item, this updates the corre-

node.Text = caption;

}

sponding node as well.

// Save the changes to the album

. . .

}