c++/cursespad.cc

// * this is for making emacs happy: -*-Mode: C++;-*-
/****************************************************************************
 * Copyright 2020 Thomas E. Dickey                                          *
 * Copyright 1999-2012,2013 Free Software Foundation, Inc.                  *
 *                                                                          *
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 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
 *                                                                          *
 * Except as contained in this notice, the name(s) of the above copyright   *
 * holders shall not be used in advertising or otherwise to promote the     *
 * sale, use or other dealings in this Software without prior written       *
 * authorization.                                                           *
 ****************************************************************************/

/****************************************************************************
 *   Author: Juergen Pfeifer, 1999                                          *
 ****************************************************************************/

#include "internal.h"

#include <cursesw.h>

MODULE_ID("$Id: cursespad.cc,v 1.18 2020/02/02 23:34:34 tom Exp $")

NCursesPad::NCursesPad(int nlines, int ncols)
  : NCursesWindow(),
    viewWin(static_cast<NCursesWindow*>(0)),
    viewSub(static_cast<NCursesWindow*>(0)),
    h_gridsize(0), v_gridsize(0),
    min_row(0), min_col(0)
{
  w = ::newpad(nlines, ncols);
  if (static_cast<WINDOW*>(0) == w) {
    count--;
    err_handler("Cannot construct window");
  }
  alloced = TRUE;
}


int NCursesPad::driver (int key)
{
  // Default implementation
  switch(key) {
  case KEY_UP:
    // =======
    return REQ_PAD_UP;
  case KEY_DOWN:
    // =========
    return REQ_PAD_DOWN;
  case KEY_LEFT:
    // =========
    return REQ_PAD_LEFT;
  case KEY_RIGHT:
    // ==========
    return REQ_PAD_RIGHT;
  case KEY_EXIT:
    // =========
  case CTRL('X'):
    // ==========
    return REQ_PAD_EXIT;

  default: return(key);
  }
}


void NCursesPad::operator()(void)
{
  NCursesWindow* W = Win();

  if (static_cast<NCursesWindow*>(0) != W) {
    int Width  = W->width();
    int Height = W->height();

    int req = REQ_PAD_REFRESH;

    W->keypad(TRUE);
    W->meta(TRUE);
    refresh();

    do {
      bool changed = FALSE;

      switch (req) {
      case REQ_PAD_REFRESH:
	// ================
	changed = TRUE;
	break;
      case REQ_PAD_LEFT:
	// =============
	if (min_col > 0) {
	  changed = TRUE;
	  if (min_col < h_gridsize)
	    min_col = 0;
	  else
	    min_col -= h_gridsize;
	}
	else
	  OnNavigationError(req);
	break;
      case REQ_PAD_RIGHT:
	// ==============
	if (min_col < (width() - Width - 1)) {
	  changed = TRUE;
	  if (min_col > (width() - Width - h_gridsize - 1))
	    min_col = width() - Width - 1;
	  else
	    min_col += h_gridsize;
	}
	else
	  OnNavigationError(req);
	break;
      case REQ_PAD_UP:
	// ===========
	if (min_row > 0) {
	  changed = TRUE;
	  if (min_row < v_gridsize)
	    min_row = 0;
	  else
	    min_row -= v_gridsize;
	}
	else
	  OnNavigationError(req);
	break;
      case REQ_PAD_DOWN:
	// =============
	if (min_row < (height() - Height - 1)) {
	  changed = TRUE;
	  if (min_row > (height() - Height - v_gridsize - 1))
	    min_row = height() - Height - 1;
	  else
	    min_row += v_gridsize;
	}
	else
	  OnNavigationError(req);
	break;

      default:
	OnUnknownOperation(req);
      }

      if (changed) {
	noutrefresh();
	W->syncup();
	OnOperation(req);
	viewWin->refresh();
      }
    } while( (req=driver(W->getch())) != REQ_PAD_EXIT );
  }
}


int NCursesPad::refresh()
{
  int res = noutrefresh();
  if (res==OK && (static_cast<NCursesWindow*>(0) != viewWin)) {
    res = (viewWin->refresh());
  }
  return(res);
}

int NCursesPad::noutrefresh()
{
  int res = OK;
  NCursesWindow* W = Win();
  if (static_cast<NCursesWindow*>(0) != W) {
    int high = W->maxy();
    int wide = W->maxx();
    res = copywin(*W, min_row, min_col,
		  0, 0, high, wide,
		  FALSE);
    if (res==OK) {
      W->syncup();
      res = viewWin->noutrefresh();
    }
  }
  return (res);
}

void NCursesPad::setWindow(NCursesWindow& view,
			   int v_grid NCURSES_PARAM_INIT(1),
			   int h_grid NCURSES_PARAM_INIT(1))
{
  viewWin = &view;
  min_row = min_col = 0;
  if (h_grid <=0 || v_grid <= 0)
    err_handler("Illegal Gridsize");
  else {
    h_gridsize = h_grid;
    v_gridsize = v_grid;
  }
}

void NCursesPad::setSubWindow(NCursesWindow& sub)
{
  if (static_cast<NCursesWindow*>(0) == viewWin)
    err_handler("Pad has no viewport");
  assert(viewWin != 0);
  if (!viewWin->isDescendant(sub))
    THROW(new NCursesException("NCursesFramePad", E_SYSTEM_ERROR));
  viewSub = &sub;
}

void NCursesFramedPad::OnOperation(int pad_req)
{
  (void) pad_req;
  NCursesWindow* W = Win();
  NCursesWindow* W2 = getWindow();

  if ((static_cast<NCursesWindow*>(0) != W) && (static_cast<NCursesWindow*>(0) != W2)) {
    int Width  = W->width();
    int Height = W->height();
    int i, row, col, h_len, v_len;

    int my_width = width();

    if (my_width != 0) {
      h_len = (Width*Width + my_width - 1) / my_width;
      if (h_len==0)
	h_len = 1;
      if (h_len > Width)
	h_len = Width;
    } else {
      h_len = 1;
    }

    int my_height = height();

    if (my_height != 0) {
      v_len = (Height*Height + my_height - 1) / my_height;
      if (v_len==0)
	v_len = 1;
      if (v_len > Height)
	v_len = Height;
    } else {
      v_len = 1;
    }

    if (my_width != 0) {
      col  = (min_col * Width + my_width - 1) / my_width;
      if (col + h_len > Width)
        col = Width - h_len;
    } else {
      col = 0;
    }

    if (my_height != 0) {
      row  = (min_row * Height + my_height - 1) / my_height;
      if (row + v_len > Height)
        row = Height - v_len;
    } else {
      row = 0;
    }

    W2->vline(1,Width+1,Height);
    W2->attron(A_REVERSE);
    if (v_len>=2) {
      W2->addch(row+1,Width+1,ACS_UARROW);
      for(i=2;i<v_len;i++)
	W2->addch(row+i,Width+1,' ');
      W2->addch(row+v_len,Width+1,ACS_DARROW);
    }
    else {
      for(i=1;i<=v_len;i++)
	W2->addch(row+i,Width+1,' ');
    }
    W2->attroff(A_REVERSE);

    W2->hline(Height+1,1,Width);
    W2->attron(A_REVERSE);
    if (h_len >= 2) {
      W2->addch(Height+1,col+1,ACS_LARROW);
      for(i=2;i<h_len;i++)
	W2->addch(Height+1,col+i,' ');
      W2->addch(Height+1,col+h_len,ACS_RARROW);
    }
    else {
      for(i=1;i<=h_len;i++)
	W2->addch(Height+1,col+i,' ');
    }
    W2->attroff(A_REVERSE);
  }
}