require "../../src/ui/event_handler"

describe UI::EventHandler do
  it "verifies event accumulates and remove callbacks" do
    a = UI::EventHandler.new
    counter = 0
    a.add(UI::EventHandler::Event::KeyPressed) do |cb|
      counter += 1
    end
    a.add(UI::EventHandler::Event::KeyReleased) do |cb|
      counter += 10
    end

    # test having multiple events with different types
    counter.should eq(0)
    a.handle(UI::EventHandler::Event::KeyPressed.new)
    counter.should eq(1)
    a.handle(UI::EventHandler::Event::KeyPressed.new)
    counter.should eq(2)
    a.handle(UI::EventHandler::Event::KeyReleased.new)
    counter.should eq(12)

    # test 2 callbacks on the same event
    a.add(UI::EventHandler::Event::KeyPressed) do |cb|
      counter += 1
    end
    a.handle(UI::EventHandler::Event::KeyPressed.new)
    counter.should eq(14)

    # test a callback with autoremove (useful for keypressing)
    a.add(UI::EventHandler::Event::KeyPressed) do |cb|
      counter += 100
      a.remove(UI::EventHandler::Event::KeyPressed, cb)
    end
    a.handle(UI::EventHandler::Event::KeyPressed.new)
    counter.should eq(116)
    a.handle(UI::EventHandler::Event::KeyPressed.new)
    counter.should eq(118)
  end
end