public void StringFormatOneWayToSource()
{
var property = BindableProperty.Create("Foo", typeof(string), typeof(MockBindable));
var binding = CreateBinding(BindingMode.OneWayToSource, "Foo {0}");
var vm = new MockViewModel {
Text = "Bar"
};
var bo = new MockBindable {
BindingContext = vm
};
bo.SetBinding(property, binding);
bo.SetValue(property, "Bar");
Assert.That(vm.Text, Is.EqualTo("Bar"));
}
public void StringFormatOnUpdate()
{
var property = BindableProperty.Create("Foo", typeof(string), typeof(MockBindable));
var binding = CreateBinding(BindingMode.Default, "Foo {0}");
var vm = new MockViewModel {
Text = "Bar"
};
var bo = new MockBindable {
BindingContext = vm
};
bo.SetBinding(property, binding);
vm.Text = "Baz";
Assert.That(bo.GetValue(property), Is.EqualTo("Foo Baz"));
}
public void ValueUpdatedWithSimplePathOnTwoWayBinding(
[Values(true, false)] bool isDefault)
{
const string newvalue = "New Value";
var viewmodel = new MockViewModel
{
Text = "Foo"
};
BindingMode propertyDefault = BindingMode.OneWay;
BindingMode bindingMode = BindingMode.TwoWay;
if (isDefault)
{
propertyDefault = BindingMode.TwoWay;
bindingMode = BindingMode.Default;
}
var property = BindableProperty.Create("Text", typeof(string), typeof(MockBindable), "default value", propertyDefault);
var binding = CreateBinding(bindingMode);
var bindable = new MockBindable();
bindable.BindingContext = viewmodel;
bindable.SetBinding(property, binding);
viewmodel.Text = newvalue;
Assert.AreEqual(newvalue, bindable.GetValue(property),
"Target property did not update change");
Assert.AreEqual(newvalue, viewmodel.Text,
"Source property changed from what it was set to");
const string newvalue2 = "New Value in the other direction";
bindable.SetValue(property, newvalue2);
Assert.AreEqual(newvalue2, viewmodel.Text,
"Source property did not update with Target's change");
Assert.AreEqual(newvalue2, bindable.GetValue(property),
"Target property changed from what it was set to");
var messages = MockApplication.MockLogger.Messages;
Assert.That(messages.Count, Is.EqualTo(0),
"An error was logged: " + messages.FirstOrDefault());
}
public void ValueSetOnTwoWay(
[Values(true, false)] bool setContextFirst,
[Values(true, false)] bool isDefault)
{
const string value = "Foo";
var viewmodel = new MockViewModel
{
Text = value
};
BindingMode propertyDefault = BindingMode.OneWay;
BindingMode bindingMode = BindingMode.TwoWay;
if (isDefault)
{
propertyDefault = BindingMode.TwoWay;
bindingMode = BindingMode.Default;
}
var property = BindableProperty.Create("Text", typeof(string), typeof(MockBindable), defaultValue: "default value", defaultBindingMode: propertyDefault);
var binding = CreateBinding(bindingMode);
var bindable = new MockBindable();
if (setContextFirst)
{
bindable.BindingContext = viewmodel;
bindable.SetBinding(property, binding);
}
else
{
bindable.SetBinding(property, binding);
bindable.BindingContext = viewmodel;
}
Assert.AreEqual(value, viewmodel.Text,
"BindingContext property changed");
Assert.AreEqual(value, bindable.GetValue(property),
"Target property did not change");
var messages = MockApplication.MockLogger.Messages;
Assert.That(messages.Count, Is.EqualTo(0),
"An error was logged: " + messages.FirstOrDefault());
}
public void ValueUpdatedWithSimplePathOnOneWayToSourceBinding(
[Values(true, false)] bool isDefault)
{
const string newvalue = "New Value";
var viewmodel = new MockViewModel
{
Text = "Foo"
};
BindingMode propertyDefault = BindingMode.OneWay;
BindingMode bindingMode = BindingMode.OneWayToSource;
if (isDefault)
{
propertyDefault = BindingMode.OneWayToSource;
bindingMode = BindingMode.Default;
}
var property = BindableProperty.Create("Text", typeof(string), typeof(MockBindable), "default value", propertyDefault);
var binding = CreateBinding(bindingMode);
var bindable = new MockBindable();
bindable.BindingContext = viewmodel;
bindable.SetBinding(property, binding);
string original = (string)bindable.GetValue(property);
const string value = "value";
viewmodel.Text = value;
Assert.AreEqual(original, bindable.GetValue(property),
"Target updated from Source on OneWayToSource");
bindable.SetValue(property, newvalue);
Assert.AreEqual(newvalue, bindable.GetValue(property),
"Bindable did not update on binding context property change");
Assert.AreEqual(newvalue, viewmodel.Text,
"Source property changed when it shouldn't");
Assert.That(log.Messages.Count, Is.EqualTo(0),
"An error was logged: " + log.Messages.FirstOrDefault());
}
public void ValueUpdatedWithOldContextDoesNotUpdateWithTwoWayBinding(bool isDefault)
{
const string newvalue = "New Value";
var viewmodel = new MockViewModel
{
Text = "Foo"
};
BindingMode propertyDefault = BindingMode.OneWay;
BindingMode bindingMode = BindingMode.TwoWay;
if (isDefault)
{
propertyDefault = BindingMode.TwoWay;
bindingMode = BindingMode.Default;
}
var property = BindableProperty.Create("Text", typeof(string), typeof(MockBindable), "default value", propertyDefault);
var binding = CreateBinding(bindingMode);
var bindable = new MockBindable();
bindable.BindingContext = viewmodel;
bindable.SetBinding(property, binding);
bindable.BindingContext = new MockViewModel();
Assert.AreEqual(null, bindable.GetValue(property));
viewmodel.Text = newvalue;
Assert.AreEqual(null, bindable.GetValue(property),
"Target updated from old Source property change");
string original = viewmodel.Text;
bindable.SetValue(property, newvalue);
Assert.AreEqual(original, viewmodel.Text,
"Source updated from old Target property change");
var messages = MockApplication.MockLogger.Messages;
Assert.That(messages.Count, Is.EqualTo(0),
"An error was logged: " + messages.FirstOrDefault());
}
public void PropertyChangeBindingsOccurThroughMainThread()
{
var vm = new MockViewModel {
Text = "text"
};
var bindable = new MockBindable();
var binding = CreateBinding();
bindable.BindingContext = vm;
bindable.SetBinding(MockBindable.TextProperty, binding);
bool invokeOnMainThreadWasCalled = false;
Device.PlatformServices = new MockPlatformServices(a => invokeOnMainThreadWasCalled = true, isInvokeRequired: true);
vm.Text = "updated";
// If we wait five seconds and invokeOnMainThreadWasCalled still hasn't been set, something is very wrong
Assert.That(invokeOnMainThreadWasCalled, Is.True.After(5000, 10));
}
public void ReuseBindingInstance()
{
var vm = new MockViewModel();
var bindable = new MockBindable();
bindable.BindingContext = vm;
var property = BindableProperty.Create("Foo", typeof(string), typeof(MockBindable));
var binding = new Binding("Text");
bindable.SetBinding(property, binding);
var bindable2 = new MockBindable();
bindable2.BindingContext = new MockViewModel();
Assert.Throws <InvalidOperationException>(() => bindable2.SetBinding(property, binding),
"Binding allowed reapplication with a different context");
GC.KeepAlive(bindable);
}