private Task _ensureWindowOpen(RegionService service)
{
if (!service.Hosts.OfType <Window>().Any())
{
var w = new Window();
w.Unloaded += (s, e) =>
{
var action = _onClosing;
_onClosing = null;
action?.Invoke();
};
Application.Current.Exit += (s, e) =>
{
var action = _onClosing;
_onClosing = null;
action?.Invoke();
};
_myWindows.Add(w);
w.Style = WindowStyle;
RegionHost.SetRegion(w, service.Region);
w.Show();
}
return(Tasks.Empty);
}
private Task _ensureWindowCloses(RegionService service)
{
var windows = service.Hosts.OfType <Window>();
var mine = windows.Intersect(_myWindows).ToList();
foreach (var win in mine)
{
win.Close();
_myWindows.Remove(win);
}
return(Tasks.Empty);
}
private async Task _invalidate(RegionService service)
{
var entry = await service.CurrentRegionEntry.Get();
if (entry == RegionEntry.Empty)
{
await _ensureWindowCloses(service);
}
else
{
await _ensureWindowOpen(service);
}
}
private Task _ensureWindowOpen(RegionService service)
{
if (!service.Hosts.OfType <Window>().Any())
{
var w = new Window();
w.SizeToContent = SizeToContent;
w.WindowStartupLocation = WindowStartupLocation;
_myWindows.Add(w);
w.Style = WindowStyle;
RegionHost.SetRegion(w, service.Region);
// simply calling ShowDialog will block the method, so e need to trick it...
w.Dispatcher.BeginInvoke(new Action(() => {
// make sure window was not closed since dispatching
if (_myWindows.Contains(w))
{
w.ShowDialog();
}
}));
}
return(Tasks.Empty);
}
protected virtual Task AfterNavigationOverride(RegionService service)
{
return(Tasks.Empty);
}
internal Task AfterNavigation(RegionService service)
{
return(AfterNavigationOverride(service));
}
internal Task BeforeNavigation(RegionService service)
{
return(BeforeNavigationOverride(service));
}
protected override async Task AfterNavigationOverride(RegionService service)
{
await base.AfterNavigationOverride(service);
await _invalidate(service);
}
public Task MoveEntryStateWhere(Func <RegionEntry, bool> entryPicker, RegionService target)
{
return(Run(() => _moveEntryStateWhere(entryPicker, target)));
}
private async Task _moveEntryStateWhere(Func <RegionEntry, bool> entryPicker, RegionService target)
{
var entries = _savedStates.Keys.Where(entryPicker).ToArray();
var states = entries.ToDictionary(entry => entry, entry => _savedStates.GetAndRemove(entry));
await target._importEntryStates(states);
}
internal async Task Initialize(RegionService regionService, object param)
{
Parameter = param;
RegionService = regionService;
await OnInitialized(param);
}
internal abstract Task AfterNavigation(RegionService service, ContentControl host);
