297 lines
9.0 KiB
C
297 lines
9.0 KiB
C
/* gtkscrollbarpeer.c -- Native implementation of GtkScrollbarPeer
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Copyright (C) 1998, 1999, 2006 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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#include <math.h>
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#include "gtkpeer.h"
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#include "gnu_java_awt_peer_gtk_GtkComponentPeer.h"
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#include "gnu_java_awt_peer_gtk_GtkScrollbarPeer.h"
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#define AWT_ADJUSTMENT_UNIT_INCREMENT 1
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#define AWT_ADJUSTMENT_UNIT_DECREMENT 2
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#define AWT_ADJUSTMENT_BLOCK_DECREMENT 3
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#define AWT_ADJUSTMENT_BLOCK_INCREMENT 4
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#define AWT_ADJUSTMENT_TRACK 5
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static jmethodID postAdjustmentEventID;
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static GtkWidget *scrollbar_get_widget (GtkWidget *widget);
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void
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cp_gtk_scrollbar_init_jni (void)
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{
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jclass gtkscrollbarpeer;
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gtkscrollbarpeer = (*cp_gtk_gdk_env())->FindClass (cp_gtk_gdk_env(),
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"gnu/java/awt/peer/gtk/GtkScrollbarPeer");
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postAdjustmentEventID = (*cp_gtk_gdk_env())->GetMethodID (cp_gtk_gdk_env(),
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gtkscrollbarpeer,
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"postAdjustmentEvent",
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"(II)V");
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}
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#if GTK_MINOR_VERSION > 4
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static gboolean slider_moved_cb (GtkRange *range,
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GtkScrollType scroll,
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gdouble value,
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jobject obj);
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#else
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static void post_change_event_cb (GtkRange *range,
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jobject peer);
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#endif
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JNIEXPORT void JNICALL
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Java_gnu_java_awt_peer_gtk_GtkScrollbarPeer_create
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(JNIEnv *env, jobject obj, jint orientation, jint value,
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jint min, jint max, jint step_incr, jint page_incr, jint visible_amount)
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{
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GtkWidget *scrollbar;
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GtkWidget *eventbox;
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GtkObject *adj;
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/* Create global reference and save it for future use */
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gtkpeer_set_global_ref (env, obj);
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gdk_threads_enter ();
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/* A little hack because gtk_range_set_range() doesn't allow min == max. */
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if (min == max)
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{
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if (visible_amount == 0)
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visible_amount = 1;
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max++;
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}
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adj = gtk_adjustment_new ((gdouble) value,
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(gdouble) min,
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(gdouble) max,
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(gdouble) step_incr,
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(gdouble) page_incr,
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(gdouble) visible_amount);
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scrollbar = orientation
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? gtk_vscrollbar_new (GTK_ADJUSTMENT (adj))
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: gtk_hscrollbar_new (GTK_ADJUSTMENT (adj));
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eventbox = gtk_event_box_new ();
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gtk_container_add (GTK_CONTAINER (eventbox), scrollbar);
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gtk_widget_show (scrollbar);
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GTK_RANGE (scrollbar)->round_digits = 0;
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/* These calls seem redundant but they are not. They clamp values
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so that the slider's entirety is always between the two
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steppers. */
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gtk_range_set_range (GTK_RANGE (scrollbar), (gdouble) min, (gdouble) max);
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gtk_range_set_value (GTK_RANGE (scrollbar), (gdouble) value);
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gdk_threads_leave ();
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gtkpeer_set_widget (env, obj, eventbox);
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}
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JNIEXPORT void JNICALL
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Java_gnu_java_awt_peer_gtk_GtkScrollbarPeer_connectSignals
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(JNIEnv *env, jobject obj)
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{
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void *ptr = gtkpeer_get_widget (env, obj);
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GtkWidget *wid = scrollbar_get_widget (GTK_WIDGET (ptr));
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jobject gref = gtkpeer_get_global_ref (env, obj);
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g_assert (gref);
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gdk_threads_enter ();
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/* Scrollbar signals */
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#if GTK_MINOR_VERSION > 4
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g_signal_connect (G_OBJECT (wid), "change-value",
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G_CALLBACK (slider_moved_cb), gref);
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#else
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g_signal_connect (G_OBJECT (wid), "value-changed",
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G_CALLBACK (post_change_event_cb), gref);
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#endif
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/* Component signals */
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cp_gtk_component_connect_signals (G_OBJECT (wid), gref);
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gdk_threads_leave ();
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}
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JNIEXPORT void JNICALL
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Java_gnu_java_awt_peer_gtk_GtkScrollbarPeer_setLineIncrement
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(JNIEnv *env, jobject obj, jint amount)
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{
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void *ptr;
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GtkAdjustment *adj;
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GtkWidget *wid;
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ptr = gtkpeer_get_widget (env, obj);
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wid = scrollbar_get_widget (GTK_WIDGET (ptr));
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gdk_threads_enter ();
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adj = gtk_range_get_adjustment (GTK_RANGE (wid));
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adj->step_increment = (gdouble) amount;
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gtk_adjustment_changed (adj);
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gdk_threads_leave ();
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}
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JNIEXPORT void JNICALL
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Java_gnu_java_awt_peer_gtk_GtkScrollbarPeer_setPageIncrement
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(JNIEnv *env, jobject obj, jint amount)
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{
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void *ptr;
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GtkAdjustment *adj;
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GtkWidget *wid;
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ptr = gtkpeer_get_widget (env, obj);
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wid = scrollbar_get_widget (GTK_WIDGET (ptr));
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gdk_threads_enter ();
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adj = gtk_range_get_adjustment (GTK_RANGE (wid));
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adj->page_increment = (gdouble) amount;
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gtk_adjustment_changed (adj);
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gdk_threads_leave ();
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}
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JNIEXPORT void JNICALL
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Java_gnu_java_awt_peer_gtk_GtkScrollbarPeer_setBarValues
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(JNIEnv *env, jobject obj, jint value, jint visible, jint min, jint max)
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{
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void *ptr;
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GtkAdjustment *adj;
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GtkWidget *wid;
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ptr = gtkpeer_get_widget (env, obj);
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wid = scrollbar_get_widget (GTK_WIDGET (ptr));
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gdk_threads_enter ();
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/* A little hack because gtk_range_set_range() doesn't allow min == max. */
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if (min == max)
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{
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if (visible == 0)
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visible = 1;
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max++;
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}
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adj = gtk_range_get_adjustment (GTK_RANGE (wid));
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adj->page_size = (gdouble) visible;
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gtk_range_set_range (GTK_RANGE (wid), (gdouble) min, (gdouble) max);
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gtk_range_set_value (GTK_RANGE (wid), (gdouble) value);
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gdk_threads_leave ();
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}
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#if GTK_MINOR_VERSION > 4
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static gboolean
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slider_moved_cb (GtkRange *range,
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GtkScrollType scroll,
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gdouble value,
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jobject obj)
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{
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GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (range));
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value = CLAMP (value, adj->lower,
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(adj->upper - adj->page_size));
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if (range->round_digits >= 0)
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{
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gdouble power;
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gint i;
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i = range->round_digits;
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power = 1;
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while (i--)
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power *= 10;
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value = floor ((value * power) + 0.5) / power;
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}
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switch (scroll)
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{
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case GTK_SCROLL_STEP_BACKWARD:
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(*cp_gtk_gdk_env())->CallVoidMethod (cp_gtk_gdk_env(), obj, postAdjustmentEventID,
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AWT_ADJUSTMENT_UNIT_DECREMENT,
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(jint) value);
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break;
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case GTK_SCROLL_STEP_FORWARD:
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(*cp_gtk_gdk_env())->CallVoidMethod (cp_gtk_gdk_env(), obj, postAdjustmentEventID,
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AWT_ADJUSTMENT_UNIT_INCREMENT,
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(jint) value);
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break;
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case GTK_SCROLL_PAGE_BACKWARD:
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(*cp_gtk_gdk_env())->CallVoidMethod (cp_gtk_gdk_env(), obj, postAdjustmentEventID,
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AWT_ADJUSTMENT_BLOCK_DECREMENT,
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(jint) value);
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break;
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case GTK_SCROLL_PAGE_FORWARD:
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(*cp_gtk_gdk_env())->CallVoidMethod (cp_gtk_gdk_env(), obj, postAdjustmentEventID,
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AWT_ADJUSTMENT_BLOCK_INCREMENT,
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(jint) value);
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break;
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default:
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/* GTK_SCROLL_JUMP: */
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(*cp_gtk_gdk_env())->CallVoidMethod (cp_gtk_gdk_env(), obj, postAdjustmentEventID,
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AWT_ADJUSTMENT_TRACK,
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(jint) value);
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break;
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}
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return FALSE;
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}
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#else
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static void
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post_change_event_cb (GtkRange *range, jobject peer)
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{
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GtkAdjustment *adj;
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adj = gtk_range_get_adjustment (range);
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(*cp_gtk_gdk_env())->CallVoidMethod (cp_gtk_gdk_env(), peer, postAdjustmentEventID,
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AWT_ADJUSTMENT_TRACK, (jint) adj->value);
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}
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#endif
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static GtkWidget *
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scrollbar_get_widget (GtkWidget *widget)
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{
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GtkWidget *wid;
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g_assert (GTK_IS_EVENT_BOX (widget));
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wid = gtk_bin_get_child (GTK_BIN(widget));
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return wid;
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}
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