| /* 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 */ |
| NSA_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 (); |
| |
| NSA_SET_PTR (env, obj, eventbox); |
| } |
| |
| JNIEXPORT void JNICALL |
| Java_gnu_java_awt_peer_gtk_GtkScrollbarPeer_connectSignals |
| (JNIEnv *env, jobject obj) |
| { |
| void *ptr = NSA_GET_PTR (env, obj); |
| GtkWidget *wid = scrollbar_get_widget (GTK_WIDGET (ptr)); |
| jobject *gref = NSA_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 = NSA_GET_PTR (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 = NSA_GET_PTR (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 = NSA_GET_PTR (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; |
| } |