public void AssignCommandToButton()
{
CommandProvider.OnClickCount = 0;
TestViewModel viewModel = new TestViewModel();
using(var button = new Button()) {
button.SetCommand(viewModel.TestCommand);
Assert.That(viewModel.TestCommandExecuteCount, Is.EqualTo(0));
button.PerformClick();
Assert.That(viewModel.TestCommandExecuteCount, Is.EqualTo(1));
Assert.That(viewModel.ExecuteParameter, Is.Null);
Assert.That(viewModel.CanExecuteParameter, Is.Null);
Assert.That(CommandProvider.OnClickCount, Is.EqualTo(1));
button.SetCommand(null);
button.PerformClick();
Assert.That(viewModel.TestCommandExecuteCount, Is.EqualTo(1));
Assert.That(CommandProvider.OnClickCount, Is.EqualTo(1));
viewModel.CanExecuteTestCommand = false;
button.SetCommand(viewModel.TestCommand);
button.PerformClick();
Assert.That(viewModel.TestCommandExecuteCount, Is.EqualTo(1));
Assert.That(CommandProvider.OnClickCount, Is.EqualTo(1));
viewModel.CanExecuteTestCommand = true;
button.SetCommandParameter("param");
button.PerformClick();
Assert.That(viewModel.TestCommandExecuteCount, Is.EqualTo(2));
Assert.That(viewModel.ExecuteParameter, Is.EqualTo("param"));
Assert.That(viewModel.CanExecuteParameter, Is.EqualTo("param"));
Assert.That(CommandProvider.OnClickCount, Is.EqualTo(2));
}
}
public void UpdateIsEnabledOnSetParameter()
{
var command = new DelegateCommand<string>(o => { }, o => string.IsNullOrEmpty(o));
using(var button = new Button()) {
button.SetCommand(command);
Assert.That(button.Enabled, Is.True);
button.SetCommandParameter("x");
Assert.That(button.Enabled, Is.False);
button.SetCommandParameter(null);
Assert.That(button.Enabled, Is.True);
button.SetCommandParameter("x");
Assert.That(button.Enabled, Is.False);
button.SetCommand(null);
Assert.That(button.Enabled, Is.True);
button.SetCommand(command);
Assert.That(button.Enabled, Is.False);
}
}
public void TwoWayBindingForAttachedProperty()
{
var viewModel = new TestViewModel() { };
using(var button = new Button()) {
button.SetDataContext(viewModel);
PropertyEntry<object> entry = CommandProvider.CommandParameterProperty.GetPropertyEntry(button);
Assert.That(entry.ChangedSubscribeCount, Is.EqualTo(0));
button.SetBinding(CommandProvider.CommandParameterProperty, new Binding(() => viewModel.StringProperty, BindingMode.TwoWay));
Assert.That(entry.ChangedSubscribeCount, Is.EqualTo(1));
Assert.That(button.GetCommandParameter(), Is.Null);
button.SetCommandParameter("test");
Assert.That(viewModel.StringProperty, Is.EqualTo("test"));
button.ClearBinding(CommandProvider.CommandParameterProperty);
Assert.That(entry.ChangedSubscribeCount, Is.EqualTo(0));
Assert.That(viewModel.StringProperty, Is.EqualTo("test"));
Assert.That(button.GetCommandParameter(), Is.Null);
viewModel.StringProperty = "test2";
Assert.That(button.GetCommandParameter(), Is.Null);
button.SetCommandParameter("test3");
}
}