Action

Action

Result

4

Otherwise, indicate that the current

else

drag and drop data is not accepted by

e.Effect = DragDropEffects.None;

this control.

}

5

Add a DragDrop event handler for the

private void pnlPhoto_DragDrop

panel.

(object sender,

System.Windows.Forms.DragEventArgs e)

{

6

In this handler:

object obj = e.Data.GetData(

a. Retrieve the data in FileDrop for-

DataFormats.FileDrop);

Array files = obj as Array;

mat associated with the event.

int index = -1;

b. Convert this data to an Array

foreach (object o in files)

instance.

{

c. For each object in the array, con-

string s = o as string;

vert the object to a string.

7

If a string is found, then:

if (s != null)

a. Create a new Photograph object

{

Photograph photo

using this string.

= new Photograph(s);

b. See if the Photograph is already in

// Add the file (if not present)

the current album.

index = _album.IndexOf(photo);

c. If not, then add the new photo to

if (index < 0)

the album.

{

index = _album.Add(photo);

Note: Recall that the Photograph

_bAlbumChanged = true;

object will simply display a bad

}

image bitmap if an invalid or non-

}

}

image file name is provided.

8

If a Photograph was found in the

if (index >= 0)

foreach loop, then

{

a. Adjust the current album position

// Show the last image added

_album.CurrentPosition = index;

to the discovered index.

Invalidate();

b. Invalidate the form to redraw the

}

}

window.