class UIng::Area::Handler

• UIng::Area::Handler
• Reference
• Object

Overview

Drawing and input callbacks with closure support. Area retains the Handler and its Procs; native UserData points back to it. Keep captured native resources unfreed while callbacks use them. Direct LibUI callers must retain the Handler themselves.

handler = Area::Handler.new do draw { |area, params| puts "Drawing..." } key_event { |area, event| true } # Return true if handled end

Included Modules

• UIng::BlockConstructor

Defined in:

uing/area/handler.cr

Constant Summary

SCROLL_CALLBACK = ->(ah : ::Pointer(LibUI::AreaHandler), area : ::Pointer(LibUI::Area), event : ::Pointer(LibUI::AreaScrollEvent)) : LibC::Int do begin handler = ::Box(Handler).unbox(ah.value.user_data) callback = handler.scroll_event_callback || (return 0) area_wrapper = ((ControlRegistry.lookup(area)).as?(Area)) || (Area.new(area, borrowed: true)) callback.call(area_wrapper, Area::ScrollEvent.new(event)) ? 1 : 0 rescue e UIng.handle_callback_error(e, "Area scroll_event") 0 end end

Constructors

• .new(*args, &)
• .new(*args, **kwargs, &)
• .new

  ameba:disable Metrics/CyclomaticComplexity

Instance Method Summary

• #clear_drag_broken : Nil
• #clear_draw : Nil
• #clear_key_event : Nil
• #clear_mouse_crossed : Nil
• #clear_mouse_event : Nil
• #clear_scroll_event : Nil
• #drag_broken(&block : Area -> Nil)
• #drag_broken(callback : Nil) : Nil
• #draw(&block : Area, Area::Draw::Params -> Nil)
• #draw(callback : Nil) : Nil
• #key_event(&block : Area, Area::KeyEvent -> Bool)
• #key_event(callback : Nil) : Nil
• #mouse_crossed(&block : Area, Bool -> Nil)
• #mouse_crossed(callback : Nil) : Nil
• #mouse_event(&block : Area, Area::MouseEvent -> Nil)
• #mouse_event(callback : Nil) : Nil
• #scroll_event(&block : Area, Area::ScrollEvent -> Bool)

  Receives wheel and trackpad movement.

• #scroll_event(callback : Nil) : Nil
• #to_unsafe

Constructor Detail

Instance Method Detail