/// <summary>
/// responses to various button click scenarios
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Button_Click(object sender, RoutedEventArgs e)
{
//get the sender button
Button btSender = (Button)sender;
//for controller use content and others their name
switch (btSender != btController ? btSender.Name : btSender.Content.ToString())
{
case "btTarget":
new Thread((dwnlSource) =>
{
try
{
//find the file name from the url and use it
SaveFileDialog selectTarget = new SaveFileDialog();
selectTarget.FileName = Download.FindFileName((string)dwnlSource);
selectTarget.Title = "Select a file to save download";
string dwnlTarget = selectTarget.ShowDialog() == true ? selectTarget.FileName : "";
//set file path in application thread
Application.Current.Dispatcher.Invoke(() => txtTarget.Text = dwnlTarget);
}
catch (Exception ex)
{
//show exception message
MessageBox.Show(ex.Message, "Download Failed");
}
}).Start(txtSource.Text);
break;
case "Start":
//disable items on window to prevent inconsistency
if (txtSource.Text.Length != 0 && txtTarget.Text.Length != 0)
{
//disable UI
txtSource.IsEnabled
= txtTarget.IsEnabled
= btTarget.IsEnabled
= btSender.IsEnabled
= false;
//get the source and target url
string dwnlSource = txtSource.Text;
string dwnlTarget = txtTarget.Text;
new Thread(() =>
{
try
{
//create a new download job
download = new Download(dwnlSource, dwnlTarget);
//run the rest in application thread
Application.Current.Dispatcher.Invoke(() =>
{
//stop the download tracker and engine if they exist
if (downloadTracker != null)
{
downloadTracker.Stop();
}
if (downloadEngine != null)
{
downloadEngine.Abort().Join();
}
//create the tracker, engine
downloadTracker = new DispatcherTimer();
downloadTracker.Interval = TimeSpan.FromSeconds(1);
downloadTracker.Tick += Tracker;
downloadTracker.Start();
//create the engine
downloadEngine = new DownloadEngine(download, downloadTracker);
downloadEngine.Start();
});
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Download Failed");
//reset the UI in application thread
Application.Current.Dispatcher.Invoke(() => ResetUI());
}
}).Start();
}
else
{
MessageBox.Show("Need Download source and target path", "Incomplete Data");
}
break;
case "Pause":
downloadEngine.Abort();
break;
case "Resume":
downloadEngine.Start();
break;
}
}
public void Add(Download download)
{
_dowloads.Add(download);
download.PropertyChanged += PropertyChanged;
download.PropertyChanged += Download_PropertyChanged;
}
/// <summary>
/// download engine tracker updating the UI
/// </summary>
/// <param name="sender">dispatcher timer tracker</param>
/// <param name="e">eventargs</param>
private void Tracker(object sender, EventArgs e)
{
//tracking progress data
string strSize = Download.FormatBytes(download.DwnlSize);
string strCompleted = Download.FormatBytes(download.DwnlSizeCompleted);
string strSpeed = "0.00 KBps";
string strProgress = txtProgress.Content.ToString();
double valProgress = 0;
switch (downloadEngine.State)
{
case DwnlState.Create:
strProgress = DotAnimation(strProgress, "Creating download job");
break;
case DwnlState.Idle:
strProgress = "Waiting to start / resume download ● ● ●";
//enable resume button
btController.Content = "Resume";
btController.IsEnabled = true;
break;
case DwnlState.Start:
strProgress = DotAnimation(strProgress, "Starting download");
break;
case DwnlState.Download:
strSpeed = Download.FormatBytes(download.DwnlSpeed) + "ps";
valProgress = download.DwnlProgress;
strProgress = DotAnimation(strProgress, string.Format("Downloading at {0:f2}%", download.DwnlProgress));
//enable the pause button
btController.Content = "Pause";
btController.IsEnabled = true;
break;
case DwnlState.Append:
valProgress = download.AppendProgress;
strProgress = DotAnimation(strProgress, string.Format("Appending at {0:f2}%", download.AppendProgress));
//disable controller
btController.IsEnabled = false;
break;
case DwnlState.Complete:
valProgress = 100;
strProgress = "Download complete ● ● ●";
ResetUI();
break;
case DwnlState.Error:
strProgress = "Download error ● ● ●";
//display error message
if (txtProgress.Content.ToString() != strProgress)
{
MessageBox.Show(downloadEngine.Error.Message, "Download Failed");
}
ResetUI();
break;
case DwnlState.Abort:
strProgress = DotAnimation(strProgress, "Aborting download");
//disable controller button
btController.IsEnabled = false;
break;
}
//updatring progress data
txtSize.Content = strSize;
txtComplete.Content = strCompleted;
txtSpeed.Content = strSpeed;
txtProgress.Content = strProgress;
barProgress.Value = valProgress;
}
public void SetCurrentDownload(Download download)
{
_selected = download;
ModelStateChanged();
}
