// Add a new entry with the displayed data
private void addEntry()
{
try
{
// Create a new entry with all the data
JournalEntry entry = new JournalEntry();
entry.Date = DateTime.Now;
entry.Title = textBox_title.Text;
++maxEntryId;
entry.Id = maxEntryId;
entry.Text = textBox_entry.Text;
// Add the new entry
currentJournal.Entries.Add(entry);
// Update displayed entry info
updateDisplayedInfo(entry);
}
catch (Exception except)
{
MessageBox.Show("An error occurred when adding entry: "
+ except.Message);
}
}
// Update displayed entry ID and index
private void updateDisplayedInfo(JournalEntry row)
{
try
{
// Display the entry ID
label_entryId.Content = labelEntryIdPrefix +
Environment.NewLine + row.Id;
// Save ID and index of displayed entry
displayedEntryId = row.Id;
displayedEntryIndex =
currentJournal.Entries.IndexOf
(currentJournal.Entries.Single(i => i.Id == displayedEntryId));
// Reset indication that displayed entry has changed
displayedEntryChanged = false;
}
catch (Exception except)
{
MessageBox.Show
("An error occurred when updating displayed entry information: "
+ except.Message);
}
}
// Entry selection changed in grid: display entry data
// If the displayed data has changed, offer chance to save it
private void dataGrid_JournalEntries_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
// Check that non-empty row has been selected
if (dataGrid_JournalEntries.SelectedItem != null &&
dataGrid_JournalEntries.SelectedItem is JournalEntry)
{
// Get selected row
JournalEntry rowEntry = new JournalEntry();
rowEntry = (JournalEntry)dataGrid_JournalEntries.SelectedItem;
// Before displaying selected row,
// save displayed data if it has changed
if (displayedEntryChanged)
{
SaveChanges();
}
// Display entry data of selected row
textBox_title.Text = rowEntry.Title;
textBox_entry.Text = rowEntry.Text;
// Update displayed entry info
updateDisplayedInfo(rowEntry);
}
}
