//=============================================================================
private Task <object> OnBeforeAppShutdown()
{
if (m_CurrentDocument == null)
{
return(null);
}
// Ask for save before app close.
if (m_CurrentDocument.HasChanges)
{
// undo all not completed changes
m_CurrentDocument.SetTheLastState();
SaveChangesDialog_ViewModel saveChangesDialogVM = new SaveChangesDialog_ViewModel();
saveChangesDialogVM.Text = "Application session is limited by 24 hours. Application will be closed. Do you want to save changes?";
saveChangesDialogVM.IsSaveButtonVisible = true;
saveChangesDialogVM.IsCancelButtonVisible = false;
SaveChangesDialog saveChangesDialog = new SaveChangesDialog(saveChangesDialogVM);
// Close previous dialog.
if (DlgHost != null && DlgHost.IsOpen)
{
DlgHost.IsOpen = false;
}
return(DialogHost.Show(saveChangesDialog).ContinueWith <object>((previousTask) =>
{
var prevTaskResult = previousTask.Result;
// true - save
// false - cancel
// null - continue
if (prevTaskResult is bool && (bool)prevTaskResult)
{
// save the document
string strFilePath = string.Empty;
if (m_CurrentDocument.IsItNewDocument || m_CurrentDocument.NameWithoutExtension != m_CurrentDocument.CustomerENQ)
{
string strOldPath = null;
if (!m_CurrentDocument.IsItNewDocument && !string.IsNullOrEmpty(m_CurrentDocument.Path))
{
strOldPath = m_CurrentDocument.Path;
}
strFilePath = FileUtils._SaveFileDialog(DrawingDocument.FILE_FILTER, DrawingDocument.FILE_EXTENSION, m_CurrentDocument.CustomerENQ, m_CurrentDocument.CustomerENQ, strOldPath);
if (string.IsNullOrEmpty(strFilePath))
{
return null;
}
}
// Try to save in UI thread, otherwise DrawingDocument.Save throws an exception on DrawingControl.Update() method which updates UI.
if (DrawingControl != null)
{
DrawingControl.Dispatcher.Invoke(new Action(() =>
{
m_CurrentDocument.Save(strFilePath);
}
));
return true;
}
else
{
return m_CurrentDocument.Save(strFilePath);
}
}
return null;
}));
}
else
{
return(this.DisplayMessageDialog("Application session is limited by 24 hours. Application will be closed."));
}
return(null);
}
public void Save()
{
m_Document.Save();
}