libjava/jni/gtk-peer/gnu_java_awt_peer_gtk_GtkScrollBarPeer.c

   1 /* gtkscrollbarpeer.c -- Native implementation of GtkScrollbarPeer
   2    Copyright (C) 1998, 1999 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 #include "gtkpeer.h"
  40 #include "gnu_java_awt_peer_gtk_GtkComponentPeer.h"
  41 #include "gnu_java_awt_peer_gtk_GtkScrollbarPeer.h"
  42
  43 static void post_change_event (GtkRange *range, jobject peer);
  44
  45 JNIEXPORT void JNICALL
  46 Java_gnu_java_awt_peer_gtk_GtkScrollbarPeer_create
  47 (JNIEnv *env, jobject obj, jint orientation, jint value,
  48  jint min, jint max, jint step_incr, jint page_incr, jint visible_amount)
  49 {
  50   GtkWidget *scrollbar;
  51   GtkObject *adj;
  52
  53   /* Create global reference and save it for future use */
  54   NSA_SET_GLOBAL_REF (env, obj);
  55
  56   gdk_threads_enter ();
  57
  58   adj = gtk_adjustment_new ((gdouble) value,
  59                             (gdouble) min,
  60                             (gdouble) max,
  61                             (gdouble) step_incr,
  62                             (gdouble) page_incr,
  63                             (gdouble) visible_amount);
  64
  65   scrollbar = (orientation) ? gtk_vscrollbar_new (GTK_ADJUSTMENT (adj)) :
  66                        gtk_hscrollbar_new (GTK_ADJUSTMENT (adj));
  67
  68   GTK_RANGE (scrollbar)->round_digits = 0;
  69   /* These calls seem redundant but they are not.  They clamp values
  70      so that the slider's entirety is always between the two
  71      steppers. */
  72   gtk_range_set_range (GTK_RANGE (scrollbar), (gdouble) min, (gdouble) max);
  73   gtk_range_set_value (GTK_RANGE (scrollbar), (gdouble) value);
  74
  75   gdk_threads_leave ();
  76
  77   NSA_SET_PTR (env, obj, scrollbar);
  78 }
  79
  80 JNIEXPORT void JNICALL
  81 Java_gnu_java_awt_peer_gtk_GtkScrollbarPeer_connectSignals
  82   (JNIEnv *env, jobject obj)
  83 {
  84   void *ptr = NSA_GET_PTR (env, obj);
  85   jobject *gref = NSA_GET_GLOBAL_REF (env, obj);
  86   g_assert (gref);
  87
  88   gdk_threads_enter ();
  89
  90   g_signal_connect (G_OBJECT (ptr), "value-changed",
  91                     G_CALLBACK (post_change_event), *gref);
  92
  93   gdk_threads_leave ();
  94
  95   /* Connect the superclass signals.  */
  96   Java_gnu_java_awt_peer_gtk_GtkComponentPeer_connectSignals (env, obj);
  97 }
  98
  99
 100 JNIEXPORT void JNICALL
 101 Java_gnu_java_awt_peer_gtk_GtkScrollbarPeer_setLineIncrement
 102     (JNIEnv *env, jobject obj, jint amount)
 103 {
 104   void *ptr;
 105   GtkAdjustment *adj;
 106
 107   ptr = NSA_GET_PTR (env, obj);
 108
 109   gdk_threads_enter ();
 110
 111   adj = gtk_range_get_adjustment (GTK_RANGE (ptr));
 112   adj->step_increment = (gdouble) amount;
 113   gtk_adjustment_changed (adj);
 114
 115   gdk_threads_leave ();
 116 }
 117
 118 JNIEXPORT void JNICALL
 119 Java_gnu_java_awt_peer_gtk_GtkScrollbarPeer_setPageIncrement
 120     (JNIEnv *env, jobject obj, jint amount)
 121 {
 122   void *ptr;
 123   GtkAdjustment *adj;
 124
 125   ptr = NSA_GET_PTR (env, obj);
 126
 127   gdk_threads_enter ();
 128
 129   adj = gtk_range_get_adjustment (GTK_RANGE (ptr));
 130   adj->page_increment = (gdouble) amount;
 131   gtk_adjustment_changed (adj);
 132
 133   gdk_threads_leave ();
 134 }
 135
 136 JNIEXPORT void JNICALL
 137 Java_gnu_java_awt_peer_gtk_GtkScrollbarPeer_setValues
 138     (JNIEnv *env, jobject obj, jint value, jint visible, jint min, jint max)
 139 {
 140   void *ptr;
 141   GtkAdjustment *adj;
 142
 143   ptr = NSA_GET_PTR (env, obj);
 144
 145   gdk_threads_enter ();
 146
 147   adj = gtk_range_get_adjustment (GTK_RANGE (ptr));
 148   adj->page_size = (gdouble) visible;
 149
 150   gtk_range_set_range (GTK_RANGE (ptr), (gdouble) min, (gdouble) max);
 151   gtk_range_set_value (GTK_RANGE (ptr), (gdouble) value);
 152
 153   gtk_adjustment_changed (adj);
 154
 155   gdk_threads_leave ();
 156 }
 157
 158 static void
 159 post_change_event (GtkRange *range, jobject peer)
 160 {
 161   GtkAdjustment *adj;
 162   adj = gtk_range_get_adjustment (range);
 163   (*gdk_env())->CallVoidMethod (gdk_env(), peer, postAdjustmentEventID,
 164                               AWT_ADJUSTMENT_TRACK, (jint) adj->value);
 165 }