Class: RbSDL2::Window::HitTest

Inherits:
FFI::Function
  • Object
show all
Defined in:
lib/rb_sdl2/window/hit_test.rb

Constant Summary collapse

HIT_TEST_RESULT = 
Hash.new(::SDL2::SDL_HITTEST_NORMAL).merge!(
  :normal => ::SDL2::SDL_HITTEST_NORMAL,
  :draggable => ::SDL2::SDL_HITTEST_DRAGGABLE,
  :top_left => ::SDL2::SDL_HITTEST_RESIZE_TOPLEFT,
  :top => ::SDL2::SDL_HITTEST_RESIZE_TOP,
  :top_right => ::SDL2::SDL_HITTEST_RESIZE_TOPRIGHT,
  :resize_right => ::SDL2::SDL_HITTEST_RESIZE_RIGHT,
  :bottom_right => ::SDL2::SDL_HITTEST_RESIZE_BOTTOMRIGHT,
  :bottom => ::SDL2::SDL_HITTEST_RESIZE_BOTTOM,
  :bottom_left => ::SDL2::SDL_HITTEST_RESIZE_BOTTOMLEFT,
  :resize_left => ::SDL2::SDL_HITTEST_RESIZE_LEFT,
).freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(&block) ⇒ HitTest

Returns a new instance of HitTest.



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# File 'lib/rb_sdl2/window/hit_test.rb', line 41

def initialize(&block)
  # typedef SDL_HitTestResult (*SDL_HitTest)(SDL_Window *win,
  #                                          const SDL_Point *area, void *data);
  super(:int, [:pointer, :pointer, :pointer]) do |win, area, _data|
    # コールバック実行終了を OS が待つようなので、与えらえた window ポインターは有効なものとしてよいだろう。
    # area には SDL_Point のアドレスが入る。SDL_Point は x, y の２つの int 型メンバーである。
    HIT_TEST_RESULT[yield(Window.to_ptr(win), ::SDL2::SDL_Point.new(area).values)]
  end
end

Class Method Details

.callback_set(window, obj, userdata = nil) ⇒ Object 



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# File 'lib/rb_sdl2/window/hit_test.rb', line 8

def callback_set(window, obj, userdata = nil)
  func = if Proc === obj
           new(&obj)
         else
           obj
         end
  @mutex.synchronize do
    err = ::SDL2.SDL_SetWindowHitTest(window, func, userdata)
    raise RbSDL2Error if err < 0
    id = window.id
    if obj
      @callbacks[id] = [func, userdata]
    else
      @callbacks.delete(id)
    end
  end
  [obj, userdata]
end