public void ShowDialog(string name, IDialogParameters parameters, Action <IDialogResult> callback)
{
try
{
parameters = UriParsingHelper.GetSegmentParameters(name, parameters);
var view = CreateViewFor(UriParsingHelper.GetSegmentName(name));
var dialogAware = InitializeDialog(view, parameters);
var currentPage = GetCurrentContentPage();
var dialogModal = new DialogPage();
dialogAware.RequestClose += DialogAware_RequestClose;
void DialogAware_RequestClose(IDialogParameters outParameters)
{
try
{
var result = CloseDialog(outParameters ?? new DialogParameters(), currentPage, dialogModal);
if (result.Exception is DialogException de && de.Message == DialogException.CanCloseIsFalse)
{
return;
}
dialogAware.RequestClose -= DialogAware_RequestClose;
callback?.Invoke(result);
GC.Collect();
}
catch (DialogException dex)
{
if (dex.Message != DialogException.CanCloseIsFalse)
{
callback?.Invoke(new DialogResult
{
Exception = dex,
Parameters = parameters
});
}
}
catch (Exception ex)
{
callback?.Invoke(new DialogResult
{
Exception = ex,
Parameters = parameters
});
}
}
if (!parameters.TryGetValue <bool>(KnownDialogParameters.CloseOnBackgroundTapped, out var closeOnBackgroundTapped))
{
var dialogLayoutCloseOnBackgroundTapped = DialogLayout.GetCloseOnBackgroundTapped(view);
if (dialogLayoutCloseOnBackgroundTapped.HasValue)
{
closeOnBackgroundTapped = dialogLayoutCloseOnBackgroundTapped.Value;
}
}
InsertPopupViewInCurrentPage(currentPage as ContentPage, dialogModal, view, closeOnBackgroundTapped, DialogAware_RequestClose);
PageUtilities.InvokeViewAndViewModelAction <IActiveAware>(currentPage, aa => aa.IsActive = false);
PageUtilities.InvokeViewAndViewModelAction <IActiveAware>(view, aa => aa.IsActive = true);
}
catch (Exception ex)
{
var error = ex.ToString();
callback?.Invoke(new DialogResult {
Exception = ex
});
}
}
private IDialogResult CloseDialog(IDialogParameters parameters, ContentPage currentPage, DialogPage dialogModal)
{
try
{
if (parameters is null)
{
parameters = new DialogParameters();
}
var view = dialogModal.DialogView;
var dialogAware = GetDialogController(view);
if (!dialogAware.CanCloseDialog())
{
throw new DialogException(DialogException.CanCloseIsFalse);
}
currentPage.Navigation.PopModalAsync(true);
PageUtilities.InvokeViewAndViewModelAction <IActiveAware>(view, aa => aa.IsActive = false);
PageUtilities.InvokeViewAndViewModelAction <IActiveAware>(currentPage, aa => aa.IsActive = true);
dialogAware.OnDialogClosed();
return(new DialogResult
{
Parameters = parameters
});
}
catch (DialogException)
{
throw;
}
catch (Exception ex)
{
return(new DialogResult
{
Exception = ex,
Parameters = parameters
});
}
}
private void InsertPopupViewInCurrentPage(ContentPage currentPage, DialogPage modalPage, View popupView, bool hideOnBackgroundTapped, Action <IDialogParameters> callback)
{
View mask = DialogLayout.GetMask(popupView);
if (mask is null)
{
Style overlayStyle = GetOverlayStyle(popupView);
mask = new BoxView
{
Style = overlayStyle
};
}
mask.SetBinding(VisualElement.WidthRequestProperty, new Binding {
Path = "Width", Source = modalPage
});
mask.SetBinding(VisualElement.HeightRequestProperty, new Binding {
Path = "Height", Source = modalPage
});
if (hideOnBackgroundTapped)
{
var dismissCommand = new Command(() => callback(new DialogParameters()));
mask.GestureRecognizers.Add(new TapGestureRecognizer
{
Command = dismissCommand
});
}
var overlay = new AbsoluteLayout();
var popupContainer = new DialogContainer
{
IsPopupContent = true,
HorizontalOptions = LayoutOptions.Center,
VerticalOptions = LayoutOptions.Center,
Content = popupView,
};
var relativeWidth = DialogLayout.GetRelativeWidthRequest(popupView);
if (relativeWidth != null)
{
popupContainer.SetBinding(DialogContainer.WidthRequestProperty,
new Binding("Width",
BindingMode.OneWay,
new RelativeContentSizeConverter {
RelativeSize = relativeWidth.Value
},
source: modalPage));
}
var relativeHeight = DialogLayout.GetRelativeHeightRequest(popupView);
if (relativeHeight != null)
{
popupContainer.SetBinding(DialogContainer.HeightRequestProperty,
new Binding("Height",
BindingMode.OneWay,
new RelativeContentSizeConverter {
RelativeSize = relativeHeight.Value
},
source: modalPage));
}
AbsoluteLayout.SetLayoutFlags(popupContainer, AbsoluteLayoutFlags.PositionProportional);
var popupBounds = DialogLayout.GetLayoutBounds(popupView);
AbsoluteLayout.SetLayoutBounds(popupContainer, popupBounds);
if (DialogLayout.GetUseMask(popupContainer.Content) ?? true)
{
overlay.Children.Add(mask);
}
overlay.Children.Add(popupContainer);
modalPage.Content = overlay;
modalPage.DialogView = popupView;
currentPage.Navigation.PushModalAsync(modalPage, true);
}
private async System.Threading.Tasks.Task <IDialogResult> CloseDialogAsync(IDialogParameters parameters, ContentPage currentPage, DialogPage dialogModal)
{
try
{
PageNavigationService.NavigationSource = PageNavigationSource.DialogService;
if (parameters is null)
{
parameters = new DialogParameters();
}
var view = dialogModal.DialogView;
var dialogAware = GetDialogController(view);
if (!dialogAware.CanCloseDialog())
{
throw new DialogException(DialogException.CanCloseIsFalse);
}
await currentPage.Navigation.PopModalAsync(true);
PageUtilities.InvokeViewAndViewModelAction <IActiveAware>(view, aa => aa.IsActive = false);
PageUtilities.InvokeViewAndViewModelAction <IActiveAware>(currentPage, aa => aa.IsActive = true);
dialogAware.OnDialogClosed();
return(new DialogResult
{
Parameters = parameters
});
}
catch (DialogException)
{
throw;
}
catch (Exception ex)
{
return(new DialogResult
{
Exception = ex,
Parameters = parameters
});
}
finally
{
PageNavigationService.NavigationSource = PageNavigationSource.Device;
}
}