// an event handler for drag & drop for the naming instructions..
private void tbCommon_DragDrop(object sender, DragEventArgs e)
{
// if the data is of type of string set the effect to move..
if (e.Data.GetDataPresent(typeof(TagDescriptionPair)) &&
sender.Equals(activeTextBox)) // the sender must be one of the two formula text boxes..
{
e.Effect = DragDropEffects.Move; // ensure a move effect..
TagDescriptionPair dropPair = (TagDescriptionPair)e.Data.GetData(typeof(TagDescriptionPair));
// set the text of the dropped item..
activeTextBox.SelectedText = dropPair.Tag;
}
}
// select the corresponding text from the active formula text box if the selected item
// is contained within the text in the text box..
private void lbDragItems_SelectedIndexChanged(object sender, EventArgs e)
{
ListBox lb = (ListBox)sender; // the list box..
if (lb.SelectedItem != null) // check if an item is selected..
{
TagDescriptionPair pair = (TagDescriptionPair)lb.SelectedItem; // get the selected item..
if (activeTextBox.Text.Contains(pair.Tag)) // if the text is there..
{
// ..select the text..
activeTextBox.Select(activeTextBox.Text.IndexOf(pair.Tag, StringComparison.Ordinal), pair.Tag.Length);
activeTextBox.Focus(); // set the focus to the text box..
}
}
}
