/// <summary>
/// Evaluates the parameter.
/// </summary>
/// <param name = "expression">The expression.</param>
/// <param name = "context">The context.</param>
/// <param name = "resultType">Type of the result.</param>
/// <returns>The evaluated parameter.</returns>
private static object EvaluateParameter(string expression, ActionExecutionContext context, Type resultType)
{
try
{
var index = 0;
var parameters = new ParameterExpression[MessageBinder.SpecialValues.Count];
var values = new object[MessageBinder.SpecialValues.Count];
foreach (var pair in MessageBinder.SpecialValues)
{
var name = "@" + index;
expression = expression.Replace(pair.Key, name);
var value = pair.Value(context);
parameters[index] = Expression.Parameter(GetParameterType(value), name);
values[index] = value;
index++;
}
var exp = DynamicExpression.ParseLambda(parameters, resultType, expression);
return(exp.Compile().DynamicInvoke(values));
}
catch (Exception exc)
{
LogManager.GetLog(typeof(MessageBinder)).Error(exc);
return(null);
}
}
/// <summary>
/// Get the close action for the specified view model.
/// </summary>
/// <param name="viewModel">The view model to close.</param>
/// <param name="views">The associated views.</param>
/// <param name="dialogResult">The dialog result.</param>
/// <returns>
/// An <see cref="Action" /> to close the view model.
/// </returns>
/// <exception cref="System.NotImplementedException"></exception>
public virtual Func <CancellationToken, Task> GetViewCloseAction(object viewModel, ICollection <object> views, bool?dialogResult)
{
foreach (var contextualView in views)
{
var viewType = contextualView.GetType();
#if WINDOWS_UWP
var closeMethod = viewType.GetRuntimeMethod("Close", new Type[0]);
#else
var closeMethod = viewType.GetMethod("Close");
#endif
if (closeMethod != null)
{
return ct => {
#if !WINDOWS_UWP
var isClosed = false;
if (dialogResult != null)
{
var resultProperty = contextualView.GetType().GetProperty("DialogResult");
if (resultProperty != null)
{
resultProperty.SetValue(contextualView, dialogResult, null);
isClosed = true;
}
}
if (!isClosed)
{
closeMethod.Invoke(contextualView, null);
}
#else
closeMethod.Invoke(contextualView, null);
#endif
return Task.FromResult(true);
}
}
;
#if WINDOWS_UWP
var isOpenProperty = viewType.GetRuntimeProperty("IsOpen");
#else
var isOpenProperty = viewType.GetProperty("IsOpen");
#endif
if (isOpenProperty != null)
{
return(ct =>
{
isOpenProperty.SetValue(contextualView, false, null);
return Task.FromResult(true);
});
}
}
return(ct =>
{
LogManager.GetLog(typeof(Screen)).Info("TryClose requires a parent IConductor or a view with a Close method or IsOpen property.");
return Task.FromResult(true);
});
}
}
static void ModelChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (View.InDesignMode || e.NewValue == null || e.NewValue == e.OldValue)
{
return;
}
var fe = d as FrameworkElement;
if (fe == null)
{
return;
}
View.ExecuteOnLoad(fe, delegate {
var target = e.NewValue;
var containerKey = e.NewValue as string;
if (containerKey != null)
{
LogManager.GetLog(typeof(Bind)).Info("Using IoC is deprecated and will be removed in v3.0");
target = IoC.GetInstance(null, containerKey);
}
d.SetValue(View.IsScopeRootProperty, true);
var context = string.IsNullOrEmpty(fe.Name)
? fe.GetHashCode().ToString()
: fe.Name;
ViewModelBinder.Bind(target, d, context);
});
}
/// <summary>
/// Get the close action for the specified view model.
/// </summary>
/// <param name="viewModel">The view model to close.</param>
/// <param name="views">The associated views.</param>
/// <param name="dialogResult">The dialog result.</param>
/// <returns>An <see cref="Action"/> to close the view model.</returns>
public virtual Func<CancellationToken, Task> GetViewCloseAction(object viewModel, ICollection<object> views, bool? dialogResult)
{
return ct =>
{
LogManager.GetLog(typeof(Screen)).Info("TryClose requires a parent IConductor or a view with a Close method or IsOpen property.");
return Task.FromResult(true);
};
}
/// <summary>
/// Get the close action for the specified view model.
/// </summary>
/// <param name="viewModel">The view model to close.</param>
/// <param name="views">The associated views.</param>
/// <param name="dialogResult">The dialog result.</param>
/// <returns>An <see cref="Action"/> to close the view model.</returns>
public virtual Action GetViewCloseAction(object viewModel, ICollection <object> views, bool?dialogResult)
{
var child = viewModel as IChild;
if (child != null)
{
var conductor = child.Parent as IConductor;
if (conductor != null)
{
return(() => conductor.CloseItem(viewModel));
}
}
return(() => LogManager.GetLog(typeof(Screen)).Info("TryClose requires a parent IConductor or a view with a Close method or IsOpen property."));
}
public MainViewModel(BarcodeLabel label, ApplicationPrinter printer, IEventAggregator eventAggregator)
{
this.Label = label;
this.AppPrinter = printer;
string printerName;
if (BarcodePrinter.Properties.Settings.Default.DefaultPrinterName == null || BarcodePrinter.Properties.Settings.Default.DefaultPrinterName.Length == 0)
{
printerName = printer.DefaultZebraPrinter;
}
else
{
printerName = BarcodePrinter.Properties.Settings.Default.DefaultPrinterName;
}
this.SelectedPrinter = printerName;
this.eventAggregator = eventAggregator;
logger = LogManager.GetLog(GetType());
}
/// <summary>
/// Get the close action for the specified view model.
/// </summary>
/// <param name="viewModel">The view model to close.</param>
/// <param name="views">The associated views.</param>
/// <param name="dialogResult">The dialog result.</param>
/// <returns>An <see cref="Action"/> to close the view model.</returns>
public virtual Func <CancellationToken, Task> GetViewCloseAction(object viewModel, ICollection <object> views, bool?dialogResult)
{
var child = viewModel as IChild;
if (child != null)
{
var conductor = child.Parent as IConductor;
if (conductor != null)
{
return(ct => conductor.CloseItemAsync(viewModel, ct));
}
}
return(ct =>
{
LogManager.GetLog(typeof(Screen)).Info("TryClose requires a parent IConductor or a view with a Close method or IsOpen property.");
return Task.FromResult(true);
});
}
/// <summary>
/// Get the close action for the specified view model.
/// </summary>
/// <param name="viewModel">The view model to close.</param>
/// <param name="views">The associated views.</param>
/// <param name="dialogResult">The dialog result.</param>
/// <returns>
/// An <see cref="Action" /> to close the view model.
/// </returns>
/// <exception cref="System.NotImplementedException"></exception>
Action IPlatformProvider.GetViewCloseAction(object viewModel, ICollection <object> views, bool?dialogResult)
{
var child = viewModel as IChild;
var conductor = child?.Parent as IConductor;
if (conductor != null)
{
return(() => conductor.CloseItem(viewModel));
}
foreach (var contextualView in views)
{
var viewType = contextualView.GetType();
var closeMethod = viewType.GetRuntimeMethod("Close", new Type[0]);
if (closeMethod != null)
{
return () =>
{
closeMethod.Invoke(contextualView, null);
}
}
;
var isOpenProperty = viewType.GetRuntimeProperty("IsOpen");
if (isOpenProperty != null)
{
return(() => isOpenProperty.SetValue(contextualView, false, null));
}
var parentPopup = (contextualView as FrameworkElement).FindAscendant <PopupOverlay>();
if (parentPopup != null)
{
return(() => parentPopup.Close());
}
}
return(() => LogManager.GetLog(typeof(Screen)).Info("TryClose requires a parent IConductor or a view with a Close method or IsOpen property."));
}
/// <summary>
/// Allows action parameters to be specified using Xaml compact syntax and (optionally) parameters evaluation.
/// </summary>
/// <param name = "enableEvaluation">If set to <c>true</c> action parameters will be evaluated, if needed.</param>
public static void AllowXamlSyntax(bool enableEvaluation = true)
{
if (enableEvaluation)
{
Parser.CreateParameter = (target, parameterText) =>
{
//Check if the parameter is defined as a markup...
if (parameterText.StartsWith("{") && parameterText.EndsWith("}"))
{
try
{
parameterText = string.Format(PARAMETER_XAML_FRAGMENT, XamlNamespaces, parameterText);
var parsed = LoadXaml(parameterText);
return((Parameter)parsed);
}
catch (Exception exc)
{
LogManager.GetLog(typeof(Parser)).Error(exc);
}
}
//Pass the textual value and let it be evaluated afterwards...
return(new Parameter
{
Value = parameterText
});
};
MessageBinder.EvaluateParameter = (text, parameterType, context) =>
{
var lookup = text.ToLower(CultureInfo.InvariantCulture);
Func <ActionExecutionContext, object> resolver;
return(MessageBinder.SpecialValues.TryGetValue(lookup, out resolver) ? resolver(context) : (typeof(string) == parameterType ? text : EvaluateParameter(text, context, parameterType)));
};
}
else
{
Parser.CreateParameter = (target, parameterText) =>
{
//Check if the parameter is defined as a markup...
if (parameterText.StartsWith("{") && parameterText.EndsWith("}"))
{
try
{
parameterText = string.Format(PARAMETER_XAML_FRAGMENT, XamlNamespaces, parameterText);
var parsed = LoadXaml(parameterText);
return((Parameter)parsed);
}
catch (Exception exc)
{
LogManager.GetLog(typeof(Parser)).Error(exc);
}
}
//Use the default implementation if the parameter is not identified as a binding...
return(m_BaseCreateParameter(target, parameterText));
};
MessageBinder.EvaluateParameter = m_BaseEvaluateParameter;
}
}
/// <summary>
/// Get the close action for the specified view model.
/// </summary>
/// <param name="viewModel">The view model to close.</param>
/// <param name="views">The associated views.</param>
/// <param name="dialogResult">The dialog result.</param>
/// <returns>
/// An <see cref="Action" /> to close the view model.
/// </returns>
/// <exception cref="System.NotImplementedException"></exception>
public System.Action GetViewCloseAction(object viewModel, ICollection <object> views, bool?dialogResult)
{
var child = viewModel as IChild;
if (child != null)
{
var conductor = child.Parent as IConductor;
if (conductor != null)
{
return(() => conductor.CloseItem(viewModel));
}
}
foreach (var contextualView in views)
{
var viewType = contextualView.GetType();
#if WinRT
var closeMethod = viewType.GetRuntimeMethod("Close", new Type[0]);
#else
var closeMethod = viewType.GetMethod("Close");
#endif
if (closeMethod != null)
{
return () => {
#if !SILVERLIGHT && !WinRT
var isClosed = false;
if (dialogResult != null)
{
var resultProperty = contextualView.GetType().GetProperty("DialogResult");
if (resultProperty != null)
{
resultProperty.SetValue(contextualView, dialogResult, null);
isClosed = true;
}
}
if (!isClosed)
{
closeMethod.Invoke(contextualView, null);
}
#else
closeMethod.Invoke(contextualView, null);
#endif
}
}
;
#if WinRT
var isOpenProperty = viewType.GetRuntimeProperty("IsOpen");
#else
var isOpenProperty = viewType.GetProperty("IsOpen");
#endif
if (isOpenProperty != null)
{
return(() => isOpenProperty.SetValue(contextualView, false, null));
}
}
return(() => LogManager.GetLog(typeof(Screen)).Info("TryClose requires a parent IConductor or a view with a Close method or IsOpen property."));
}
}
/// <summary>
/// Occurs after navigation
/// </summary>
/// <param name="sender"> The event sender. </param>
/// <param name="e"> The event args. </param>
protected virtual void OnNavigated(object sender, NavigationEventArgs e)
{
if (e.Uri.IsAbsoluteUri || e.Content == null)
{
return;
}
ViewLocator.InitializeComponent(e.Content);
// Do not use LocateForView because Frame control already has its
// parent's DataContext. Use LocateForViewType instead.
var viewModel = ViewModelLocator.LocateForViewType(e.Content.GetType());
//var viewModel = ViewModelLocator.LocateForView(e.Content);
if (viewModel == null)
{
if (System.Diagnostics.Debugger.IsAttached)
{
var msg = "'" + e.Content.GetType().FullName + "' must be registered in the bootstrapper (or INavigationService might never get injected)";
var exc = new InvalidOperationException(msg);
LogManager.GetLog(typeof(FrameAdapter)).Error(exc);
throw exc;
}
return;
}
// Inject dependency properties
IoC.BuildUp(viewModel);
#if WINDOWS_PHONE
var page = e.Content as PhoneApplicationPage;
#else
var page = e.Content as Page;
#endif
if (page == null)
{
throw new ArgumentException("View '" + e.Content.GetType().FullName + "' should inherit from PhoneApplicationPage or one of its descendents.");
}
if (treatViewAsLoaded)
{
page.SetValue(View.IsLoadedProperty, true);
}
TryInjectQueryString(viewModel, page);
ViewModelBinder.Bind(viewModel, page, null);
var activator = viewModel as IActivate;
if (activator != null)
{
activator.Activate();
}
#if WINDOWS_PHONE || WinRT
var page = e.Content as PhoneApplicationPage;
var viewAware = viewModel as IViewAware;
if (viewAware != null)
{
View.ExecuteOnLayoutUpdated(page, (s, a) => viewAware.OnViewReady(page));
}
#endif
GC.Collect();
}
