#pragma once
#include "gui_events.h"

namespace Gui {
  class Container;
  class Widget {
  public:
    Widget(void);
    virtual void Draw(void) = 0;
    virtual ~Widget(void) {}
    virtual void GetSizeRequested(float size[2]) = 0;
    void GetPosition(float pos[2])      { pos[0] = m_size.x; pos[1] = m_size.y; }
    void SetPosition(float x, float y)  { m_size.x = x; m_size.y = y; }
    void GetSize(float size[2])         { size[0] = m_size.w; size[1] = m_size.h; }
    void SetSize(float w, float h)      { m_size.w = w; m_size.h = h; };
    void SetShortcut(SDLKey key, SDLMod mod);
    virtual void Show(void)             { m_visible = true; }
    virtual void Hide(void)             { m_visible = false; }
    bool IsVisible(void)                { return m_visible; }
    Container* GetParent(void)          { return m_parent; }
    void SetParent(Container* p)        { m_parent = p; }

    /* Event handlers should return false to stop propagating event. */
    virtual bool OnMouseDown(MouseButtonEvent* e) { return false; }
    virtual bool OnMouseUp(MouseButtonEvent* e)   { return false; }
    virtual void OnActivate(void)                 {}
    /* Only to be called by Screen::OnKeyDown. */
    void OnPreShortcut(const SDL_keysym* sym);
    enum EventMask {
      EVENT_NONE      = 0,
      EVENT_KEYDOWN   = 1<<0,
      EVENT_KEYUP     = 1<<1,
      EVENT_MOUSEDOWN = 1<<2,
      EVENT_MOUSEUP   = 1<<3,
      EVENT_ALL       = 0xffffffff
    };
    unsigned int GetEventMask(void)   { return m_eventMask; }
  protected:
    unsigned int m_eventMask;
    struct {
      SDLKey sym;
      SDLMod mod;
    } m_shortcut;
  private:
    struct {
      float x,y,w,h;
    } m_size;
    bool m_visible;
    Container* m_parent;
  };
}