/// <summary>
/// Creates the page.
/// </summary>
/// <param name="rootModel">The root model.</param>
/// <param name="context">The context.</param>
/// <param name="settings">The optional popup settings.</param>
/// <returns>The page.</returns>
public virtual async Task <Page> CreatePageAsync(object rootModel, object context, IDictionary <string, object> settings)
{
var view = EnsurePage(rootModel, ViewLocator.LocateForModel(rootModel, null, context));
ViewModelBinder.Bind(rootModel, view, context);
var haveDisplayName = rootModel as IHaveDisplayName;
if (string.IsNullOrEmpty(view.Title) && haveDisplayName != null && !ConventionManager.HasBinding(view, Page.TitleProperty))
{
var binding = new Binding("DisplayName")
{
Mode = BindingMode.TwoWay
};
view.SetBinding(Page.TitleProperty, binding);
}
ApplySettings(view, settings);
if (rootModel is IActivate activator)
{
await activator.ActivateAsync();
}
if (rootModel is IDeactivate deactivatable)
{
view.Unloaded += async(s, e) => await deactivatable.DeactivateAsync(true);
}
return(view);
}
/// <summary>
/// Creates a window.
/// </summary>
/// <param name="rootModel">The view model.</param>
/// <param name="isDialog">Whethor or not the window is being shown as a dialog.</param>
/// <param name="context">The view context.</param>
/// <param name="settings">The optional popup settings.</param>
/// <returns>The window.</returns>
protected virtual async Task <Window> CreateWindowAsync(object rootModel, bool isDialog, object context, IDictionary <string, object> settings)
{
var view = EnsureWindow(rootModel, ViewLocator.LocateForModel(rootModel, null, context), isDialog);
ViewModelBinder.Bind(rootModel, view, context);
var haveDisplayName = rootModel as IHaveDisplayName;
if (string.IsNullOrEmpty(view.Title) && haveDisplayName != null && !ConventionManager.HasBinding(view, Window.TitleProperty))
{
var binding = new Binding("DisplayName")
{
Mode = BindingMode.TwoWay
};
view.SetBinding(Window.TitleProperty, binding);
}
ApplySettings(view, settings);
var conductor = new WindowConductor(rootModel, view);
await conductor.InitialiseAsync();
return(view);
}
/// <summary>
/// Creates a binding on a <see cref="Parameter"/>.
/// </summary>
/// <param name="target">The target to which the message is applied.</param>
/// <param name="parameter">The parameter object.</param>
/// <param name="elementName">The name of the element to bind to.</param>
/// <param name="path">The path of the element to bind to.</param>
/// <param name="bindingMode">The binding mode to use.</param>
public static void BindParameter(FrameworkElement target, Parameter parameter, string elementName, string path, BindingMode bindingMode)
{
#if XFORMS
var element = elementName == "$this" ? target : null;
if (element == null)
{
return;
}
if (string.IsNullOrEmpty(path))
{
path = ConventionManager.GetElementConvention(element.GetType()).ParameterProperty;
}
var binding = new Binding(path)
{
Source = element,
Mode = bindingMode
};
parameter.SetBinding(Parameter.ValueProperty, binding);
#else
var element = elementName == "$this"
? target
: BindingScope.GetNamedElements(target).FindName(elementName);
if (element == null)
{
return;
}
if (string.IsNullOrEmpty(path))
{
path = ConventionManager.GetElementConvention(element.GetType()).ParameterProperty;
}
#if WINDOWS_UWP
var binding = new Binding
{
Path = new PropertyPath(path),
Source = element,
Mode = bindingMode
};
#else
var binding = new Binding(path)
{
Source = element,
Mode = bindingMode
};
#endif
#if !WINDOWS_UWP
binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
#endif
BindingOperations.SetBinding(parameter, Parameter.ValueProperty, binding);
#endif
}
/// <summary>
/// Allow Xamarin to navigate to a ViewModel backed by a view which is of type <see cref="T:Xamarin.Forms.ContentView"/> by adapting the result
/// to a <see cref="T:Xamarin.Forms.ContentPage"/>.
/// </summary>
/// <param name="view">The view to be adapted</param>
/// <param name="viewModel">The view model which is bound to the view</param>
/// <returns>The adapted ContentPage</returns>
protected virtual ContentPage CreateContentPage(ContentView view, object viewModel)
{
var page = new ContentPage {
Content = view
};
var hasDiplayName = viewModel as IHaveDisplayName;
if (hasDiplayName != null)
{
var path = "DisplayName";
var property = typeof(IHaveDisplayName).GetRuntimeProperty(path);
ConventionManager.SetBinding(viewModel.GetType(), path, property, page, null, Page.TitleProperty);
page.BindingContext = viewModel;
}
return(page);
}
///<summary>
/// Checks if the <see cref="ActionMessage" /> -Target was set.
///</summary>
///<param name="element"> DependencyObject to check </param>
///<returns> True if Target or TargetWithoutContext was set on <paramref name="element" /> </returns>
public static bool HasTargetSet(DependencyObject element)
{
if (GetTarget(element) != null || GetTargetWithoutContext(element) != null)
{
return(true);
}
#if XFORMS
return(false);
#else
var frameworkElement = element as FrameworkElement;
if (frameworkElement == null)
{
return(false);
}
return(ConventionManager.HasBinding(frameworkElement, TargetProperty) ||
ConventionManager.HasBinding(frameworkElement, TargetWithoutContextProperty));
#endif
}
