public void On_child_updated_while_a_render_operation_is_in_progress_gets_queued()
{
_terminal.Height = 40;
_terminal.Width = 100;
_terminal.CursorLeft = _terminal.CursorTop = 20;
var screen = new ScreenView(_renderer, _terminal, _synchronizationContext);
var view = new TestView();
void BeforeRenderAction()
{
view.BeforeRender = null;
view.RaiseUpdated();
view.RaiseUpdated();
}
view.BeforeRender = BeforeRenderAction;
screen.Child = view;
//Simulate multiple concurrent updates
view.RaiseUpdated();
_synchronizationContext.InvokePostCallbacks();
_synchronizationContext.PostInvocationCount.Should().Be(2);
view.RenderedRegions
.Should()
.BeEquivalentSequenceTo(
new Region(0, 0, 100, 40),
new Region(0, 0, 100, 40));
}
public void On_child_updated_the_render_operation_is_synchronized()
{
_terminal.Height = 40;
_terminal.Width = 100;
_terminal.CursorLeft = _terminal.CursorTop = 20;
var screen = new ScreenView(_renderer, _terminal, _synchronizationContext);
var view = new TestView();
screen.Child = view;
//Simulate multiple concurrent updates
view.RaiseUpdated();
view.RaiseUpdated();
_synchronizationContext.InvokePostCallbacks();
_synchronizationContext.PostInvocationCount.Should().Be(1);
view.RenderedRegions.Should().BeEquivalentSequenceTo(new Region(0, 0, 100, 40));
}
public void Child_added_to_layout_registers_for_updated()
{
var layout = new TestLayout();
var view = new TestView();
layout.Add(view);
view.RaiseUpdated();
layout.OnChildUpdatedInvocationCount.Should().Be(1);
}
public void Dispose_unregisters_from_updated_event()
{
var screen = new ScreenView(_renderer, _terminal, _synchronizationContext);
var view = new TestView();
screen.Child = view;
screen.Dispose();
view.RaiseUpdated();
_synchronizationContext.PostInvocationCount.Should().Be(0);
}
public void Removing_child_from_layout_unregisters_for_updated()
{
var layout = new TestLayout();
var view = new TestView();
layout.Add(view);
layout.Remove(view);
view.RaiseUpdated();
layout.OnChildUpdatedInvocationCount.Should().Be(0);
layout.Children.Should().BeEmpty();
}