public void Test_WeakCommandBinding_CanExecuteChangedCallback()
{
var viewModel = new TestViewModel();
var view = new TestView();
Assert.IsFalse(view.Enable);
bool isEnable = false;
WeakCommandBinding commandBinding = new WeakCommandBinding(view, null, viewModel, "AddAgeCommand")
.Initialize <WeakCommandBinding>()
.AttachTargetEvent("TestViewEvent")
.OfType <WeakCommandBinding>()
.AddEnableProperty("Enable")
.Watch("Age")
.SetCanExecuteChanged((sender, args) => { isEnable = args.CanExecute; });
Assert.IsTrue(view.Enable);
Assert.IsTrue(isEnable);
Assert.AreEqual(0, viewModel.Age);
view.RaiseTestViewEvent();
Assert.AreEqual(1, viewModel.Age);
Assert.IsTrue(view.Enable);
Assert.IsTrue(isEnable);
commandBinding.SetCanExecuteChanged(null);
viewModel.Age++;
Assert.IsFalse(view.Enable);
Assert.IsTrue(isEnable);
}
public void Test_WeakCommandBinding_CanExecuteChangedCallback()
{
var viewModel = new TestViewModel();
var view = new TestView();
Assert.IsFalse(view.Enable);
bool isEnable = false;
WeakCommandBinding commandBinding = new WeakCommandBinding(view, null, viewModel, "AddAgeCommand")
.Initialize<WeakCommandBinding>()
.AttachTargetEvent("TestViewEvent")
.OfType<WeakCommandBinding>()
.AddEnableProperty("Enable")
.Watch("Age")
.SetCanExecuteChanged((sender, args) => { isEnable = args.CanExecute; });
Assert.IsTrue(view.Enable);
Assert.IsTrue(isEnable);
Assert.AreEqual(0, viewModel.Age);
view.RaiseTestViewEvent();
Assert.AreEqual(1, viewModel.Age);
Assert.IsTrue(view.Enable);
Assert.IsTrue(isEnable);
commandBinding.SetCanExecuteChanged(null);
viewModel.Age++;
Assert.IsFalse(view.Enable);
Assert.IsTrue(isEnable);
}
public void Test_WeakCommandBinding_RemoveEnableProperty_Expression()
{
var viewModel = new TestViewModel();
var view = new TestView();
Assert.IsFalse(view.Enable);
WeakCommandBinding weakCommandBinding = new WeakCommandBinding(view, null, viewModel, "AddAgeCommand")
.Initialize <WeakCommandBinding>()
.AttachTargetEvent("TestViewEvent")
.OfType <WeakCommandBinding>()
.AddEnableProperty <TestView>(i => i.Enable);
Assert.IsTrue(view.Enable);
Assert.AreEqual(0, viewModel.Age);
view.RaiseTestViewEvent();
Assert.AreEqual(1, viewModel.Age);
Assert.IsTrue(view.Enable);
weakCommandBinding.RemoveEnableProperty <TestView>(i => i.Enable);
view.RaiseTestViewEvent();
Assert.IsTrue(view.Enable);
}
public void Test_WeakCommandBinding_UnWatch()
{
var viewModel = new TestViewModel();
var view = new TestView();
Assert.IsFalse(view.Enable);
WeakCommandBinding commandBinding = new WeakCommandBinding(view, null, viewModel, "AddAgeCommand")
.Initialize <WeakCommandBinding>()
.AttachTargetEvent("TestViewEvent")
.OfType <WeakCommandBinding>()
.AddEnableProperty("Enable")
.Watch(viewModel, "Age");
commandBinding.Watch(viewModel, "Age");
Assert.IsTrue(view.Enable);
Assert.AreEqual(0, viewModel.Age);
view.RaiseTestViewEvent();
Assert.AreEqual(1, viewModel.Age);
Assert.IsTrue(view.Enable);
Exception exception = null;
try
{
commandBinding.Watch(null, "Age");
}
catch (ArgumentNullException e)
{
exception = e;
}
Assert.IsNotNull(exception);
viewModel.Age++;
Assert.IsFalse(view.Enable);
viewModel.Age--;
Assert.IsTrue(view.Enable);
commandBinding.UnWatch("Age");
viewModel.Age++;
Assert.IsTrue(view.Enable);
commandBinding.Watch(viewModel, "Age");
Assert.IsFalse(view.Enable);
commandBinding.UnWatch(viewModel, "Age");
viewModel.Age--;
Assert.IsFalse(view.Enable);
}
public void Test_WeakCommandBinding_UnWatch_Expression()
{
var viewModel = new TestViewModel();
var view = new TestView();
Assert.IsFalse(view.Enable);
WeakCommandBinding commandBinding = new WeakCommandBinding(view, null, viewModel, "AddAgeCommand")
.Initialize<WeakCommandBinding>()
.AttachTargetEvent("TestViewEvent")
.OfType<WeakCommandBinding>()
.AddEnableProperty("Enable")
.Watch<TestViewModel>(i => i.Age);
Assert.IsTrue(view.Enable);
Assert.AreEqual(0, viewModel.Age);
view.RaiseTestViewEvent();
Assert.AreEqual(1, viewModel.Age);
Assert.IsTrue(view.Enable);
viewModel.Age++;
Assert.IsFalse(view.Enable);
viewModel.Age--;
Assert.IsTrue(view.Enable);
commandBinding.UnWatch<TestViewModel>(null);
commandBinding.UnWatch(null);
Exception exception = null;
try
{
commandBinding.UnWatch(null, null);
}
catch (ArgumentNullException e)
{
exception = e;
}
Assert.IsNotNull(exception);
commandBinding.UnWatch<TestViewModel>(o => o.Age);
viewModel.Age++;
Assert.IsTrue(view.Enable);
}
public void Test_WeakCommandBinding_RemoveEnableProperty_Expression()
{
var viewModel = new TestViewModel();
var view = new TestView();
Assert.IsFalse(view.Enable);
WeakCommandBinding weakCommandBinding = new WeakCommandBinding(view, null, viewModel, "AddAgeCommand")
.Initialize<WeakCommandBinding>()
.AttachTargetEvent("TestViewEvent")
.OfType<WeakCommandBinding>()
.AddEnableProperty<TestView>(i => i.Enable);
Assert.IsTrue(view.Enable);
Assert.AreEqual(0, viewModel.Age);
view.RaiseTestViewEvent();
Assert.AreEqual(1, viewModel.Age);
Assert.IsTrue(view.Enable);
weakCommandBinding.RemoveEnableProperty<TestView>(i => i.Enable);
view.RaiseTestViewEvent();
Assert.IsTrue(view.Enable);
}
public static void Bind(this IBindingContext bindingContext, object target, string commandEvent, string enabledProperty, ICommand command)
{
var binding = new WeakCommandBinding(target, commandEvent, enabledProperty, command);
bindingContext.Bindings.Add(binding);
}
