/*  Part of XPCE --- The SWI-Prolog GUI toolkit

    Author:        Jan Wielemaker and Anjo Anjewierden
    E-mail:        jan@swi.psy.uva.nl
    WWW:           http://www.swi.psy.uva.nl/projects/xpce/
    Copyright (c)  1997-2011, University of Amsterdam
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.

    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in
       the documentation and/or other materials provided with the
       distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
    COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
    BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.
*/

#include <h/kernel.h>
#include <h/graphics.h>

static status
initialiseEditTextGesture(EditTextGesture g, Name button, Modifier modifier)
{ initialiseGesture((Gesture) g, button, modifier);
  assign(g, selection_origin, ZERO);
  assign(g, activate, OFF);

  succeed;
}


static status
eventEditTextGesture(EditTextGesture g, EventObj ev)
{ Graphical t = ev->receiver;

  if ( get(t, NAME_showCaret, EAV) == ON &&
       isAEvent(ev, NAME_keyboard) )
    return send(t, NAME_typed, ev, EAV);
  else if ( isAEvent(ev, NAME_obtainKeyboardFocus) )
    return send(t, NAME_showCaret, ON, EAV);
  else if ( isAEvent(ev, NAME_releaseKeyboardFocus) )
    return send(t, NAME_showCaret, OFF, EAV);

  return eventGesture(g, ev);
}


		/********************************
		*       GESTURE BEHAVIOUR	*
		********************************/

static status
initiateEditTextGesture(EditTextGesture g, EventObj ev)
{ Graphical t = ev->receiver;
  Int origin = get(t, NAME_pointed, getPositionEvent(ev, DEFAULT), EAV);

  if ( getMulticlickEvent(ev) != NAME_single )
    fail;

  if ( origin )
  { assign(g, selection_origin, origin);
    send(t, NAME_caret, origin, EAV);
    send(t, NAME_selection, NIL, EAV);
    assign(g, activate, ON);

    succeed;
  }

  fail;
}


static status
dragEditTextGesture(EditTextGesture g, EventObj ev)
{ Graphical t = ev->receiver;
  Int end = get(t, NAME_pointed, getPositionEvent(ev, DEFAULT), EAV);

  if ( notNil(g->max_drag_distance) )
  { PceWindow sw;

    if ( instanceOfObject((sw=ev->window), ClassWindow) &&
	 valInt(getDistanceEvent(sw->focus_event, ev)) >
	 valInt(g->max_drag_distance) )
      assign(g, activate, OFF);
  }

  if ( end )
  { send(t, NAME_selection, g->selection_origin, end, EAV);
    send(t, NAME_caret, end, EAV);

    succeed;
  }

  fail;
}


static status
terminateEditTextGesture(EditTextGesture g, EventObj ev)
{ TextObj t = ev->receiver;

  if ( instanceOfObject(t, ClassText) && notNil(t->selection) )
    send(t, NAME_copy, EAV);

  if ( g->activate == ON )
  { PceWindow sw = getWindowGraphical((Graphical)t);

    if ( sw )
      send(sw, NAME_keyboardFocus, t, EAV);
  }

  succeed;
}


		 /*******************************
		 *	 CLASS DECLARATION	*
		 *******************************/

/* Type declarations */

static char *T_initialise[] =
        { "button=[button_name]", "modifier=[modifier]" };

/* Instance Variables */

static vardecl var_editTextGesture[] =
{ IV(NAME_selectionOrigin, "int", IV_BOTH,
     NAME_internal, "Where the selection started"),
  IV(NAME_maxDragDistance, "int*", IV_BOTH,
     NAME_cancel, "Click if dragged less"),
  IV(NAME_activate, "bool", IV_BOTH,
     NAME_internal, "@on: activate on ->terminate")
};

/* Send Methods */

static senddecl send_editTextGesture[] =
{ SM(NAME_event, 1, "event", eventEditTextGesture,
     DEFAULT, "Handle typing and selection management"),
  SM(NAME_drag, 1, "event", dragEditTextGesture,
     DEFAULT, "Extend selection"),
  SM(NAME_initialise, 2, T_initialise, initialiseEditTextGesture,
     DEFAULT, "Create from button and modifier"),
  SM(NAME_initiate, 1, "event", initiateEditTextGesture,
     DEFAULT, "Clear selection and set caret"),
  SM(NAME_terminate, 1, "event", terminateEditTextGesture,
     DEFAULT, "Activate on click"),
};

/* Get Methods */

#define get_editTextGesture NULL
/*
static getdecl get_editTextGesture[] =
{
};
*/

/* Resources */

static classvardecl rc_editTextGesture[] =
{ RC(NAME_button, "button_name", "left",
     "Active on which button (middle)"),
  RC(NAME_cursor, "[cursor]", "@default",
     "Cursor while active"),
  RC(NAME_maxDragDistance, "int*", "5",
     "Cancel after dragging this far")
};

/* Class Declaration */

static Name editTextGesture_termnames[] = { NAME_button, NAME_modifier };

ClassDecl(editTextGesture_decls,
          var_editTextGesture,
	  send_editTextGesture,
	  get_editTextGesture,
	  rc_editTextGesture,
          2, editTextGesture_termnames,
          "$Rev$");

status
makeClassEditTextGesture(Class class)
{ return declareClass(class, &editTextGesture_decls);
}