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/* gtkscrollbarpeer.c -- Native implementation of GtkScrollbarPeer

   Copyright (C) 1998, 1999, 2006 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath 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

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

#include <math.h>

#include "gtkpeer.h"

#include "gnu_java_awt_peer_gtk_GtkComponentPeer.h"

#include "gnu_java_awt_peer_gtk_GtkScrollbarPeer.h"

#define AWT_ADJUSTMENT_UNIT_INCREMENT 1

#define AWT_ADJUSTMENT_UNIT_DECREMENT 2

#define AWT_ADJUSTMENT_BLOCK_DECREMENT 3

#define AWT_ADJUSTMENT_BLOCK_INCREMENT 4

#define AWT_ADJUSTMENT_TRACK 5

static jmethodID postAdjustmentEventID;

static GtkWidget *scrollbar_get_widget (GtkWidget *widget);

void

cp_gtk_scrollbar_init_jni (void)

{

  jclass gtkscrollbarpeer;

  gtkscrollbarpeer = (*cp_gtk_gdk_env())->FindClass (cp_gtk_gdk_env(),

                                     "gnu/java/awt/peer/gtk/GtkScrollbarPeer");

  postAdjustmentEventID = (*cp_gtk_gdk_env())->GetMethodID (cp_gtk_gdk_env(),

                                                     gtkscrollbarpeer,

                                                     "postAdjustmentEvent",

                                                     "(II)V");

}

#if GTK_MINOR_VERSION > 4

static gboolean slider_moved_cb (GtkRange *range,

                                 GtkScrollType scroll,

                                 gdouble value,

                                 jobject obj);

#else

static void post_change_event_cb (GtkRange *range,

                                  jobject peer);

#endif

JNIEXPORT void JNICALL

Java_gnu_java_awt_peer_gtk_GtkScrollbarPeer_create

  (JNIEnv *env, jobject obj, jint orientation, jint value,

   jint min, jint max, jint step_incr, jint page_incr, jint visible_amount)

{

  GtkWidget *scrollbar;

  GtkWidget *eventbox;

  GtkObject *adj;

  /* Create global reference and save it for future use */

  gtkpeer_set_global_ref (env, obj);

  gdk_threads_enter ();

  /* A little hack because gtk_range_set_range() doesn't allow min == max. */

  if (min == max)

    {

      if (visible_amount == 0)

        visible_amount = 1;

      max++;

    }

  adj = gtk_adjustment_new ((gdouble) value,

                            (gdouble) min,

                            (gdouble) max,

                            (gdouble) step_incr,

                            (gdouble) page_incr,

                            (gdouble) visible_amount);

  scrollbar = orientation

    ? gtk_vscrollbar_new (GTK_ADJUSTMENT (adj))

    : gtk_hscrollbar_new (GTK_ADJUSTMENT (adj));

  eventbox = gtk_event_box_new ();

  gtk_container_add (GTK_CONTAINER (eventbox), scrollbar);

  gtk_widget_show (scrollbar);

  GTK_RANGE (scrollbar)->round_digits = 0;

  /* These calls seem redundant but they are not.  They clamp values

     so that the slider's entirety is always between the two

     steppers. */

  gtk_range_set_range (GTK_RANGE (scrollbar), (gdouble) min, (gdouble) max);

  gtk_range_set_value (GTK_RANGE (scrollbar), (gdouble) value);

  gdk_threads_leave ();

  gtkpeer_set_widget (env, obj, eventbox);

}

JNIEXPORT void JNICALL

Java_gnu_java_awt_peer_gtk_GtkScrollbarPeer_connectSignals

  (JNIEnv *env, jobject obj)

{

  void *ptr = gtkpeer_get_widget (env, obj);

  GtkWidget *wid = scrollbar_get_widget (GTK_WIDGET (ptr));

  jobject gref = gtkpeer_get_global_ref (env, obj);

  g_assert (gref);

  gdk_threads_enter ();

  /* Scrollbar signals */

#if GTK_MINOR_VERSION > 4

  g_signal_connect (G_OBJECT (wid), "change-value",

                    G_CALLBACK (slider_moved_cb), gref);

#else

  g_signal_connect (G_OBJECT (wid), "value-changed",

                    G_CALLBACK (post_change_event_cb), gref);

#endif

  /* Component signals */

  cp_gtk_component_connect_signals (G_OBJECT (wid), gref);

  gdk_threads_leave ();

}

JNIEXPORT void JNICALL

Java_gnu_java_awt_peer_gtk_GtkScrollbarPeer_setLineIncrement

  (JNIEnv *env, jobject obj, jint amount)

{

  void *ptr;

  GtkAdjustment *adj;

  GtkWidget *wid;

  ptr = gtkpeer_get_widget (env, obj);

  wid = scrollbar_get_widget (GTK_WIDGET (ptr));

  gdk_threads_enter ();

  adj = gtk_range_get_adjustment (GTK_RANGE (wid));

  adj->step_increment = (gdouble) amount;

  gtk_adjustment_changed (adj);

  gdk_threads_leave ();

}

JNIEXPORT void JNICALL

Java_gnu_java_awt_peer_gtk_GtkScrollbarPeer_setPageIncrement

  (JNIEnv *env, jobject obj, jint amount)

{

  void *ptr;

  GtkAdjustment *adj;

  GtkWidget *wid;

  ptr = gtkpeer_get_widget (env, obj);

  wid = scrollbar_get_widget (GTK_WIDGET (ptr));

  gdk_threads_enter ();

  adj = gtk_range_get_adjustment (GTK_RANGE (wid));

  adj->page_increment = (gdouble) amount;

  gtk_adjustment_changed (adj);

  gdk_threads_leave ();

}

JNIEXPORT void JNICALL

Java_gnu_java_awt_peer_gtk_GtkScrollbarPeer_setBarValues

  (JNIEnv *env, jobject obj, jint value, jint visible, jint min, jint max)

{

  void *ptr;

  GtkAdjustment *adj;

  GtkWidget *wid;

  ptr = gtkpeer_get_widget (env, obj);

  wid = scrollbar_get_widget (GTK_WIDGET (ptr));

  gdk_threads_enter ();

  /* A little hack because gtk_range_set_range() doesn't allow min == max. */

  if (min == max)

    {

      if (visible == 0)

        visible = 1;

      max++;

    }

  adj = gtk_range_get_adjustment (GTK_RANGE (wid));

  adj->page_size = (gdouble) visible;

  gtk_range_set_range (GTK_RANGE (wid), (gdouble) min, (gdouble) max);

  gtk_range_set_value (GTK_RANGE (wid), (gdouble) value);

  gdk_threads_leave ();

}

#if GTK_MINOR_VERSION > 4

static gboolean

slider_moved_cb (GtkRange *range,

                 GtkScrollType scroll,

                 gdouble value,

                 jobject obj)

{

  GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (range));

  value = CLAMP (value, adj->lower,

                 (adj->upper - adj->page_size));

  if (range->round_digits >= 0)

    {

      gdouble power;

      gint i;

      i = range->round_digits;

      power = 1;

      while (i--)

        power *= 10;

      value = floor ((value * power) + 0.5) / power;

    }

  switch (scroll)

    {

    case GTK_SCROLL_STEP_BACKWARD:

      (*cp_gtk_gdk_env())->CallVoidMethod (cp_gtk_gdk_env(), obj, postAdjustmentEventID,

                                    AWT_ADJUSTMENT_UNIT_DECREMENT,

                                    (jint) value);

      break;

    case GTK_SCROLL_STEP_FORWARD:

      (*cp_gtk_gdk_env())->CallVoidMethod (cp_gtk_gdk_env(), obj, postAdjustmentEventID,

                                    AWT_ADJUSTMENT_UNIT_INCREMENT,

                                    (jint) value);

      break;

    case GTK_SCROLL_PAGE_BACKWARD:

      (*cp_gtk_gdk_env())->CallVoidMethod (cp_gtk_gdk_env(), obj, postAdjustmentEventID,

                                    AWT_ADJUSTMENT_BLOCK_DECREMENT,

                                    (jint) value);

      break;

    case GTK_SCROLL_PAGE_FORWARD:

      (*cp_gtk_gdk_env())->CallVoidMethod (cp_gtk_gdk_env(), obj, postAdjustmentEventID,

                                    AWT_ADJUSTMENT_BLOCK_INCREMENT,

                                    (jint) value);

      break;

    default:

      /* GTK_SCROLL_JUMP: */

      (*cp_gtk_gdk_env())->CallVoidMethod (cp_gtk_gdk_env(), obj, postAdjustmentEventID,

                                    AWT_ADJUSTMENT_TRACK,

                                    (jint) value);

      break;

    }

  return FALSE;

}

#else

static void

post_change_event_cb (GtkRange *range, jobject peer)

{

  GtkAdjustment *adj;

  adj = gtk_range_get_adjustment (range);

  (*cp_gtk_gdk_env())->CallVoidMethod (cp_gtk_gdk_env(), peer, postAdjustmentEventID,

                                AWT_ADJUSTMENT_TRACK, (jint) adj->value);

}

#endif

static GtkWidget *

scrollbar_get_widget (GtkWidget *widget)

{

  GtkWidget *wid;

  g_assert (GTK_IS_EVENT_BOX (widget));

  wid = gtk_bin_get_child (GTK_BIN(widget));

  return wid;

}