kc/src/libcmpp/fltk/Fl_Splitter.cpp

//| Copyright: (C) 2019-2020 Kevin Larke <contact AT larke DOT org> 
//| License: GNU GPL version 3.0 or above. See the accompanying LICENSE file.
// Code based on: http://www.mail-archive.com/fltk@easysw.com/msg04573.html
// Lucas Sanner/Ian MacArthur

#include "Fl_Splitter.h"

void Fl_HSplitter::draw()
{
  Fl_Group::draw();
  Fl_Color c = fl_color();
  fl_color(FL_BLACK);
  fl_line_style( FL_DOT, 1);

  if(splitFl && Fl::event_button1() != 0)
  {
    fl_push_clip(x(), y(), w(), h());

    yPos = Fl::event_y();

    if(Fl::event_y() > h() - (border * 2))
      yPos = h() - (border * 2);

    if(Fl::event_y() < y() + (border * 2))
      yPos = y() + (border * 2);

    fl_line( x() + border, yPos - 1, x() + w() - (border*2), yPos - 1 );
    fl_line( x() + border, yPos    , x() + w() - (border*2), yPos     );
    fl_line( x() + border, yPos + 1, x() + w() - (border*2), yPos + 1 );

    /*
    fl_line(
      x() + border,
      yPos,
      x() + w() - (border*2),
      yPos );

    fl_line(
      x() + border,
      yPos + 1,
      x() + w() - (border*2),
      yPos + 1 );
    */  

    fl_pop_clip();
  }
  else
  {
    fl_push_clip(x(), y(), w(), h());
    fl_pop_clip();
  }

  fl_color(c);
  fl_line_style(0);
}

int Fl_HSplitter::handle(int e)
{
  int ret = Fl_Group::handle(e);

  switch(e)
  {
    case FL_MOVE:

      if(hCtnl - border < Fl::event_y() && Fl::event_y() < hCtnl + border)
      {
        fl_cursor(FL_CURSOR_NS);
        splitFl = true;
      }
      else
      {
        fl_cursor(FL_CURSOR_DEFAULT);
        splitFl = false;
      }

      return 1;

    case FL_PUSH:

      if(Fl::event_button() == FL_LEFT_MOUSE && splitFl)
      {
        redraw();
      }

      return 1;

    case FL_RELEASE:

      if(Fl::event_button() == FL_LEFT_MOUSE && splitFl)
      {
        c0->resize(x(), y(), w(), yPos - y());
        hCtnl = yPos;
        c1->resize(x(),hCtnl, w(), h() - (yPos - y()));
        
        if( stretchTopFl )
          init_sizes();

        splitFl = false;
        redraw();
      }

      return 1;

    case FL_DRAG:

      if(splitFl && Fl::event_state(FL_BUTTON1) != 0)
        redraw();

      return 1;
  }

  return(ret);
}


Fl_HSplitter::Fl_HSplitter(int x, int y, int w, int h, int h1, const char *l, bool stretchBotFl)
  : Fl_Group(x, y, w, h, l)
{
  int h2 = h - h1;

  begin();
  c0 = new Splitter_Container(x, y, w, h1);
  //c0->color((Fl_Color) FL_RED);
  end();

  begin();
  c1 = new Splitter_Container(x, y + h1, w, h2);
  //c1->color((Fl_Color) FL_BLUE);
  end();

  hCtnl        =  y + h1;
  splitFl       = false;
  stretchTopFl = !stretchBotFl;
  border        = Fl::box_dy(FL_DOWN_BOX);

  if( stretchTopFl )
    resizable(c0);
}

void Fl_HSplitter::resize(int x, int y, int w, int h)
{
  Fl_Group::resize(x, y, w, h);

  if( stretchTopFl )
  {
    hCtnl  = c0->h() + y;
    yPos   = hCtnl;
    //printf("hCtnl:%i\n",hCtnl);
  }
  else
  {
    c0->resize(x, y,     w,     hCtnl - y);
    c1->resize(x, hCtnl, w, h - (hCtnl - y));
  }

}



void Fl_VSplitter::draw()
{
  Fl_Group::draw();
  Fl_Color c = fl_color();
  fl_color(FL_BLACK);
  fl_line_style( FL_DOT, 1);

  if(splitFl && Fl::event_button1() != 0)
  {
    fl_push_clip(x(), y(), w(), h());

    xPos = Fl::event_x();

    if(Fl::event_x() > w() - (border * 2))
      xPos = w() - (border * 2);

    if(Fl::event_x() < x() + (border * 2))
      xPos = x() + (border * 2);

    fl_line(xPos - 1, y() + border, xPos - 1, y() + h() - (border * 2));
    fl_line(xPos, y() + border, xPos, y() + h() - (border * 2));
    fl_line(xPos + 1, y() + border, xPos + 1, y() + h() - (border * 2));

    fl_pop_clip();
  }
  else
  {
    fl_push_clip(x(), y(), w(), h());
    fl_pop_clip();
  }

  fl_color(c);
  fl_line_style(0); // restore line style to defaults
}

int Fl_VSplitter::handle(int e)
{
  int ret = Fl_Group::handle(e);

  switch(e)
  {
    case FL_MOVE:

      if(Fl::event_x() > wCtn1 - border && Fl::event_x() < wCtn1 + border)
      {
        fl_cursor(FL_CURSOR_WE);
        splitFl = true;
      }
      else
      {
        fl_cursor(FL_CURSOR_DEFAULT);
        splitFl = false;
      }

      return 1;

    case FL_PUSH:

      if(Fl::event_button() == FL_LEFT_MOUSE && splitFl)
      {
        redraw();
      }

      return 1;

    case FL_RELEASE:

      if(Fl::event_button() == FL_LEFT_MOUSE && splitFl)
      {
        c0->resize(x(), y(), xPos, h());
        wCtn1 = xPos;
        c1->resize(wCtn1, y(), w() - wCtn1, h());
        splitFl = false;
        redraw();
      }

      return 1;

    case FL_DRAG:

      if(splitFl && Fl::event_state(FL_BUTTON1) != 0)
        redraw();

      return 1;
  }

  return(ret);
}

Fl_VSplitter::Fl_VSplitter(int x, int y, int w, int h, const char *l)
  : Fl_Group(x, y, w, h, l)
{
  begin();
  c0 = new Splitter_Container(x, y, w / 2, h);
  //c0->color((Fl_Color) FL_RED);
  end();

  begin();
  c1 = new Splitter_Container(x + (w / 2), y, w / 2, h);
  //c1->color((Fl_Color) FL_BLUE);
  end();

  wCtn1 = w / 2;
  splitFl = false;

  border = Fl::box_dx(FL_DOWN_BOX);

}

void Fl_VSplitter::resize_splitter(int x, int y, int w, int h)
{
  resize(x, y, w, h);
  c0->resize(x, y, wCtn1, h);
  c1->resize(wCtn1, y, w - wCtn1, h);
}