public ViewToViewModel(UserControl control, IBaseViewModel type, MyContentRegion region, params object[] args)
{
View = control;
ViewModel = type;
Region = region;
if (args != null)
{
Args = args;
}
}
public void ClearHistory(string regionName)
{
if (ConfigurationManager.AppSettings["disable_views"] != null)
{
if (!Regions.ContainsKey(regionName))
{
Regions[regionName] = new MyContentRegion();
RegionHistory[regionName] = new List <ViewToViewModel>();
}
}
if (Regions.ContainsKey(regionName))
{
RegionHistory[regionName].Clear();
}
else
{
throw new Exception("Invalid region name.");
}
}
public T NavigateUsingViewModel <T>(string regionName, params object[] args)
{
if (ConfigurationManager.AppSettings["disable_views"] != null)
{
if (!Regions.ContainsKey(regionName))
{
Regions[regionName] = new MyContentRegion();
RegionHistory[regionName] = new List <ViewToViewModel>();
}
}
T returnValue = default(T);
if (Regions.ContainsKey(regionName))
{
Dispatcher.Invoke(() =>
{
try
{
var region = Regions[regionName];
ClearForwardHistory(regionName);
var modelName = typeof(T).Name;
if (region.ChildRegions.ContainsKey(modelName))
{
foreach (var childRegion in region.ChildRegions.Values)
{
childRegion.Close();
}
region.Visibility = Visibility.Collapsed;
var oldControl = (UserControl)region.Content;
if (oldControl != null)
{
var baseViewModel = oldControl.DataContext as IBaseViewModel;
if (baseViewModel != null)
{
oldControl.DataContext = null;
baseViewModel.Close();
}
}
foreach (var childRegion in region.ChildRegions.Values)
{
if (childRegion.VirtualRegionName == modelName)
{
childRegion.Visibility = Visibility.Visible;
if (childRegion.Content != null && ((UserControl)childRegion.Content).DataContext.GetType().Name == modelName)
{
var baseViewModel = ((UserControl)childRegion.Content).DataContext as IBaseViewModel;
if (baseViewModel != null)
{
baseViewModel.OnNavigationCompleted();
returnValue = (T)baseViewModel;
var vievToViewModel = new ViewToViewModel((UserControl)childRegion.Content, baseViewModel, childRegion, args);
RegionHistory[regionName].Add(vievToViewModel);
RegionToViewModel[regionName] = vievToViewModel;
}
}
else
{
var control = FindViewByViewModel <T>();
var viewModel = Activator.CreateInstance(typeof(T), args);
childRegion.Content = control;
control.DataContext = viewModel;
returnValue = (T)viewModel;
if (viewModel is IBaseViewModel)
{
((IBaseViewModel)viewModel).View = control;
}
var vievToViewModel = new ViewToViewModel(control, (IBaseViewModel)viewModel, childRegion, args);
RegionHistory[regionName].Add(vievToViewModel);
RegionToViewModel[regionName] = vievToViewModel;
}
}
else
{
childRegion.Close();
}
}
}
else
{
foreach (var childRegion in region.ChildRegions.Values)
{
childRegion.Close();
}
var oldControl = (UserControl)region.Content;
if (oldControl != null)
{
var baseViewModel = oldControl.DataContext as IBaseViewModel;
if (baseViewModel != null)
{
oldControl.DataContext = null;
baseViewModel.Close();
}
}
region.Visibility = Visibility.Visible;
var control = FindViewByViewModel <T>();
var viewModel = Activator.CreateInstance(typeof(T), args);
region.Content = control;
control.DataContext = viewModel;
returnValue = (T)viewModel;
if (viewModel is IBaseViewModel)
{
((IBaseViewModel)viewModel).View = control;
}
var vievToViewModel = new ViewToViewModel(control, (IBaseViewModel)viewModel, region, args);
RegionHistory[regionName].Add(vievToViewModel);
RegionToViewModel[regionName] = vievToViewModel;
}
}
catch (Exception ex)
{
Log.Error(ex.Message, ex);
}
});
}
else
{
throw new Exception("Invalid region name.");
}
return(returnValue);
}
