/// <summary>
/// An event handler called when the calendar range has changed.
/// </summary>
/// <param name="sender">The sender object.</param>
/// <param name="e">The event arguments.</param>
private void OnCalendarDateChanged(object sender, DateRangeEventArgs e)
{
// Show a waiting message.
this.ShowMessage(Resources.LogClock_48, "Log", "Reading log files...", true);
this.listView.Enabled = false;
this.toolStrip.Enabled = false;
this.listView.Items.Clear();
this.controlLogEvent.Event = null;
// Clear the list of events.
this.events = null;
// Create a new update state.
ControlLogUpdateState state = new ControlLogUpdateState(e);
// If a current update is in progress, cancel the update state.
if (null != this.state)
this.state.Cancel();
// Update the global state.
this.state = state;
// Update the log information asynchronously on a system thread pool.
ThreadPool.QueueUserWorkItem(new WaitCallback(this.BeginUpdateLog), state);
}
/// <summary>
/// Completes an asynchronous request to update the log. The request is completed
/// on the UI thread.
/// </summary>
/// <param name="argument">The update state.</param>
private void EndUpdateLog(object argument)
{
// Execute the code on the UI thread.
this.Invoke(() =>
{
ControlLogUpdateState state = argument as ControlLogUpdateState;
// If the state is not canceled.
if (!state.IsCanceled)
{
// Complete the update.
state.Complete();
// Set the global state to null.
this.state = null;
// Hide the waiting message.
this.HideMessage();
this.listView.Enabled = true;
this.toolStrip.Enabled = true;
// Set the list of events.
this.events = state.Events;
// Update the log list.
if (this.events != null)
{
// Add the events.
foreach (LogEvent evt in this.events)
{
// Create a list view item for each event.
ListViewItem item = new ListViewItem(
new string[] { evt.Timestamp.ToString(), evt.Source, evt.Message },
(int)evt.Type
);
item.Tag = evt;
item.IndentCount = evt.Indent;
evt.Tag = item;
// Check whether this item should be in the log.
if ((this.listTypes[(int)evt.Type].State != CheckState.Checked) ||
(this.listLevels[(int)evt.Level].State != CheckState.Checked))
continue;
// Add the event item to the list.
this.listView.Items.Add(item);
}
// Update the status.
this.status.Send(ApplicationStatus.StatusType.Normal, "{0} event{1} from {2} through {3}".FormatWith(
this.events.Count,
this.events.Count.PluralSuffix(),
state.Range.Start.ToShortDateString(),
state.Range.End.ToShortDateString()), Resources.LogSuccess_16);
}
else
{
// Update the status.
this.status.Send(ApplicationStatus.StatusType.Normal, "0 events from {0} through {1}".FormatWith(state.Range.Start.ToShortDateString(), state.Range.End.ToShortDateString()), Resources.LogSuccess_16);
}
}
});
}