// Licensed GNU LGPL v3 or later: http://www.gnu.org/licenses/lgpl.html
//
#ifndef SPECTMORPH_TOOL_BUTTON_HH
#define SPECTMORPH_TOOL_BUTTON_HH

#include "smdrawutils.hh"

namespace SpectMorph
{

class ToolButton : public Widget
{
  bool        highlight = false;
  bool        pressed = false;
  char        symbol;

public:
  Signal<> signal_clicked;

  ToolButton (Widget *parent, char symbol = 0) :
    Widget (parent),
    symbol (symbol)
  {
  }
  void
  draw (const DrawEvent& devent) override
  {
    cairo_t *cr = devent.cr;
    DrawUtils du (cr);

    double space = 4;

    if (highlight)
      cairo_set_source_rgb (cr, 0.9, 0.9, 0.9);
    else
      cairo_set_source_rgb (cr, 0.7, 0.7, 0.7);

    if (symbol == 'v') /* draw triangle */
      {
        cairo_move_to (cr, space, space);
        cairo_line_to (cr, width() - space, space);
        cairo_line_to (cr, width() / 2, space + (width() - 2 * space) * 0.8);

        cairo_close_path (cr);
        cairo_stroke_preserve (cr);
        cairo_fill (cr);
      }
    else if (symbol == '>')
      {
        cairo_move_to (cr, space, space);
        cairo_line_to (cr, space, height() - space);
        cairo_line_to (cr, space + (height() - 2 * space) * 0.8, height() / 2);

        cairo_close_path (cr);
        cairo_stroke_preserve (cr);
        cairo_fill (cr);
      }
    else if (symbol == 'x')
      {
        cairo_move_to (cr, space, space);
        cairo_line_to (cr, width() - space, height() - space);

        cairo_move_to (cr, space, height() - space);
        cairo_line_to (cr, width() - space, space);

        cairo_set_line_width (cr, 2.0);
        cairo_stroke (cr);
      }
  }
  void
  enter_event() override
  {
    highlight = true;
    update();
  }
  void
  mouse_press (const MouseEvent& event) override
  {
    if (event.button == LEFT_BUTTON)
      {
        pressed = true;
        update();
      }
  }
  void
  mouse_release (const MouseEvent& event) override
  {
    if (event.button != LEFT_BUTTON || !pressed)
      return;

    pressed = false;
    update();

    if (event.x >= 0 && event.y >= 0 && event.x < width() && event.y < height())
      signal_clicked();  // this must be the last line, as deletion can occur afterwards
  }
  void
  leave_event() override
  {
    highlight = false;
    pressed = false;
    update();
  }
  void
  set_symbol (char s)
  {
    symbol = s;
    update();
  }
};

}

#endif