fltk/src/Fl_Input.cxx

//
// "$Id: Fl_Input.cxx,v 1.10.2.15.2.11 2002/05/14 15:24:03 spitzak Exp $"
//
// Input widget for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2002 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems to "fltk-bugs@fltk.org".
//

// This is the "user interface", it decodes user actions into what to
// do to the text.  See also Fl_Input_.cxx, where the text is actually
// manipulated (and some ui, in particular the mouse, is done...).
// In theory you can replace this code with another subclass to change
// the keybindings.

#include <FL/Fl.H>
#include <FL/Fl_Input.H>
#include <FL/fl_draw.H>
#include <FL/fl_ask.H>
#include "flstring.h"

void Fl_Input::draw() {
  if (input_type() == FL_HIDDEN_INPUT) return;
  Fl_Boxtype b = box();
  if (damage() & FL_DAMAGE_ALL) draw_box(b, color());
  Fl_Input_::drawtext(x()+Fl::box_dx(b)+3, y()+Fl::box_dy(b),
		      w()-Fl::box_dw(b)-6, h()-Fl::box_dh(b));
}

// kludge so shift causes selection to extend:
int Fl_Input::shift_position(int p) {
  return position(p, Fl::event_state(FL_SHIFT) ? mark() : p);
}
int Fl_Input::shift_up_down_position(int p) {
  return up_down_position(p, Fl::event_state(FL_SHIFT));
}

// If you define this symbol as zero you will get the peculiar fltk
// behavior where moving off the end of an input field will move the
// cursor into the next field:
// define it as 1 to prevent cursor movement from going to next field:
#define NORMAL_INPUT_MOVE 0

#define ctrl(x) (x^0x40)

int Fl_Input::handle_key() {

  char ascii = Fl::event_text()[0];

  int repeat_num=1;

  int del;
  if (Fl::compose(del)) {

    // Insert characters into numeric fields after checking for legality:
    if (input_type() == FL_FLOAT_INPUT || input_type() == FL_INT_INPUT) {
      Fl::compose_reset(); // ignore any foreign letters...

      // This is complex to allow "0xff12" hex to be typed:
      if (!position() && (ascii == '+' || ascii == '-') ||
	  (ascii >= '0' && ascii <= '9') ||
	  (position()==1 && index(0)=='0' && (ascii=='x' || ascii == 'X')) ||
	  (position()>1 && index(0)=='0' && (index(1)=='x'||index(1)=='X')
	   && (ascii>='A'&& ascii<='F' || ascii>='a'&& ascii<='f')) ||
	  input_type()==FL_FLOAT_INPUT && ascii && strchr(".eE+-", ascii)) {
	if (readonly()) fl_beep();
	else replace(position(), mark(), &ascii, 1);
      }
      return 1;
    }

    if (del || Fl::event_length()) {
      if (readonly()) fl_beep();
      else replace(position(), del ? position()-del : mark(),
	           Fl::event_text(), Fl::event_length());
    }
    return 1;
  }

  switch (Fl::event_key()) {
  case FL_Insert:
    if (Fl::event_state() & FL_CTRL) ascii = ctrl('C');
    else if (Fl::event_state() & FL_SHIFT) ascii = ctrl('V');
    break;
  case FL_Delete:
    if (Fl::event_state() & FL_SHIFT) ascii = ctrl('X');
    else ascii = ctrl('D');
    break;    
  case FL_Left:
    ascii = ctrl('B'); break;
  case FL_Right:
    ascii = ctrl('F'); break;
  case FL_Page_Up:
    repeat_num=5; //temporary hack
                  //TODO: find number of lines in window and use it instead 5
  case FL_Up:
    ascii = ctrl('P'); break;
  case FL_Page_Down:
    repeat_num=5; //temporary hack
                  //TODO: find number of lines in window and use it instead 5
  case FL_Down:
    ascii = ctrl('N'); break;
  case FL_Home:
    if (Fl::event_state() & FL_CTRL) {
      shift_position(0);
      return 1;
    }
    ascii = ctrl('A');
    break;
  case FL_End:
    if (Fl::event_state() & FL_CTRL) {
      shift_position(size());
      return 1;
    }
    ascii = ctrl('E'); break;
    
  case FL_BackSpace:
    ascii = ctrl('H'); break;
  case FL_Enter:
  case FL_KP_Enter:
    if (when() & FL_WHEN_ENTER_KEY) {
      position(size(), 0);
      maybe_do_callback();
      return 1;
    } else if (input_type() == FL_MULTILINE_INPUT && !readonly())
      return replace(position(), mark(), "\n", 1);
    else 
      return 0;	// reserved for shortcuts
  case FL_Tab:
    if (Fl::event_state(FL_CTRL|FL_SHIFT) || input_type()!=FL_MULTILINE_INPUT || readonly()) return 0;
    return replace(position(), mark(), &ascii, 1);
  }

  int i;
  switch (ascii) {
  case ctrl('A'):
    return shift_position(line_start(position())) + NORMAL_INPUT_MOVE;
  case ctrl('B'):
    return shift_position(position()-1) + NORMAL_INPUT_MOVE;
  case ctrl('C'): // copy
    return copy(1);
  case ctrl('D'):
  case ctrl('?'):
    if (readonly()) {
      fl_beep();
      return 1;
    }
    if (mark() != position()) return cut();
    else return cut(1);
  case ctrl('E'):
    return shift_position(line_end(position())) + NORMAL_INPUT_MOVE;
  case ctrl('F'):
    return shift_position(position()+1) + NORMAL_INPUT_MOVE;
  case ctrl('H'):
    if (readonly()) {
      fl_beep();
      return 1;
    }
    if (mark() != position()) cut();
    else cut(-1);
    return 1;
  case ctrl('K'):
    if (readonly()) {
      fl_beep();
      return 1;
    }
    if (position()>=size()) return 0;
    i = line_end(position());
    if (i == position() && i < size()) i++;
    cut(position(), i);
    return copy_cuts();
  case ctrl('N'):
    i = position();
    while (repeat_num--) {  
      i = line_end(i);
      if (i >= size()) return NORMAL_INPUT_MOVE;
      i++;
    }
    shift_up_down_position(i);
    return 1;
  case ctrl('P'):
    i = position();
    while(repeat_num--) {
      i = line_start(i);
      if (!i) return NORMAL_INPUT_MOVE;
      i--;
    }
    shift_up_down_position(line_start(i));
    return 1;
  case ctrl('U'):
    if (readonly()) {
      fl_beep();
      return 1;
    }
    return cut(0, size());
  case ctrl('V'):
  case ctrl('Y'):
    if (readonly()) {
      fl_beep();
      return 1;
    }
    Fl::paste(*this, 1);
    return 1;
  case ctrl('X'):
  case ctrl('W'):
    if (readonly()) {
      fl_beep();
      return 1;
    }
    copy(1);
    return cut();
  case ctrl('Z'):
  case ctrl('_'):
    if (readonly()) {
      fl_beep();
      return 1;
    }
    return undo();
  case ctrl('I'):
  case ctrl('J'):
  case ctrl('L'):
  case ctrl('M'):
    if (readonly()) {
      fl_beep();
      return 1;
    }
    // insert a few selected control characters literally:
    if (input_type() != FL_FLOAT_INPUT && input_type() != FL_INT_INPUT)
      return replace(position(), mark(), &ascii, 1);
  }

  return 0;
}

int Fl_Input::handle(int event) {
  static int dnd_save_position, dnd_save_mark, drag_start = -1, newpos;
  static Fl_Widget *dnd_save_focus;
  switch (event) {
  case FL_FOCUS:
    switch (Fl::event_key()) {
    case FL_Right:
      position(0);
      break;
    case FL_Left:
      position(size());
      break;
    case FL_Down:
      up_down_position(0);
      break;
    case FL_Up:
      up_down_position(line_start(size()));
      break;
    case FL_Tab:
    case 0xfe20: // XK_ISO_Left_Tab
      position(size(),0);
      break;
    default:
      position(position(),mark());// turns off the saved up/down arrow position
      break;
    }
    break;

  case FL_KEYBOARD:
    if (Fl::event_key() == FL_Tab && mark() != position()) {
      // Set the current cursor position to the end of the selection...
      if (mark() > position())
        position(mark());
      else
        position(position());
      return (1);
    } else return handle_key();

  case FL_PUSH:
    if (Fl::dnd_text_ops()) {
      int oldpos = position(), oldmark = mark();
      Fl_Boxtype b = box();
      Fl_Input_::handle_mouse(
	x()+Fl::box_dx(b)+3, y()+Fl::box_dy(b),
	w()-Fl::box_dw(b)-6, h()-Fl::box_dh(b), 0);
      newpos = position(); 
      position( oldpos, oldmark );
      if (Fl::focus()==this && !Fl::event_state(FL_SHIFT) && input_type()!=FL_SECRET_INPUT &&
	  (newpos >= mark() && newpos < position() ||
	  newpos >= position() && newpos < mark())) {
	// user clicked in the selection, may be trying to drag
	drag_start = newpos;
	return 1;
      }
      drag_start = -1;
    }

    if (Fl::focus() != this) {
      Fl::focus(this);
      handle(FL_FOCUS);
    }
    break;

  case FL_DRAG:
    if (Fl::dnd_text_ops()) {
      if (drag_start >= 0) {
	if (Fl::event_is_click()) return 1; // debounce the mouse
	// save the position because sometimes we don't get DND_ENTER:
	dnd_save_position = position();
	dnd_save_mark = mark();
	// drag the data:
	copy(0); Fl::dnd();
	return 1;
      }
    }
    break;

  case FL_RELEASE:
    if (Fl::event_button() == 2) {
      Fl::event_is_click(0); // stop double click from picking a word
      Fl::paste(*this, 0);
    } else if (!Fl::event_is_click()) {
      // copy drag-selected text to the clipboard.
      copy(0);
    } else if (Fl::event_is_click() && drag_start >= 0) {
      // user clicked in the field and wants to reset the cursor position...
      position(drag_start, drag_start);
      drag_start = -1;
    }
    return 1;

  case FL_DND_ENTER:
    Fl::belowmouse(this); // send the leave events first
    dnd_save_position = position();
    dnd_save_mark = mark();
    dnd_save_focus = Fl::focus();
    if (dnd_save_focus != this) {
      Fl::focus(this);
      handle(FL_FOCUS);
    }
    // fall through:
  case FL_DND_DRAG: 
    //int p = mouse_position(X, Y, W, H);
#if DND_OUT_XXXX
    if (Fl::focus()==this && (p>=dnd_save_position && p<=dnd_save_mark ||
		      p>=dnd_save_mark && p<=dnd_save_position)) {
      position(dnd_save_position, dnd_save_mark);
      return 0;
    }
#endif
    {
      Fl_Boxtype b = box();
      Fl_Input_::handle_mouse(
	x()+Fl::box_dx(b)+3, y()+Fl::box_dy(b),
	w()-Fl::box_dw(b)-6, h()-Fl::box_dh(b), 0);
    }
    return 1;

  case FL_DND_LEAVE:
    position(dnd_save_position, dnd_save_mark);
#if DND_OUT_XXXX
    if (!focused())
#endif
    if (dnd_save_focus != this) {
      Fl::focus(dnd_save_focus);
      handle(FL_UNFOCUS);
    }
    return 1;

  case FL_DND_RELEASE:
    take_focus();
    return 1;

  }
  Fl_Boxtype b = box();
  return Fl_Input_::handletext(event,
	x()+Fl::box_dx(b)+3, y()+Fl::box_dy(b),
	w()-Fl::box_dw(b)-6, h()-Fl::box_dh(b));
}

Fl_Input::Fl_Input(int x, int y, int w, int h, const char *l)
: Fl_Input_(x, y, w, h, l) {
}

//
// End of "$Id: Fl_Input.cxx,v 1.10.2.15.2.11 2002/05/14 15:24:03 spitzak Exp $".
//