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 /*****************************************************************************
  *   Copyright 2003 - 2010 Craig Drummond <craig.p.drummond@gmail.com>       *
  *   Copyright 2013 - 2015 Yichao Yu <yyc1992@gmail.com>                     *
  *                                                                           *
  *   This program is free software; you can redistribute it and/or modify    *
  *   it under the terms of the GNU Lesser General Public License as          *
  *   published by the Free Software Foundation; either version 2.1 of the    *
  *   License, or (at your option) version 3, or any later version accepted   *
  *   by the membership of KDE e.V. (or its successor approved by the         *
  *   membership of KDE e.V.), which shall act as a proxy defined in          *
  *   Section 6 of version 3 of the license.                                  *
  *                                                                           *
  *   This program 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       *
  *   Lesser General Public License for more details.                         *
  *                                                                           *
  *   You should have received a copy of the GNU Lesser General Public        *
  *   License along with this library. If not,                                *
  *   see <http://www.gnu.org/licenses/>.                                     *
  *****************************************************************************/
 
 #include "scrollbar.h"
 
 #include <qtcurve-utils/gtkprops.h>
 
 namespace QtCurve {
 namespace Scrollbar {
 
 static void
 cleanup(GtkWidget *widget)
 {
     GtkWidgetProps props(widget);
     if (widget && props->scrollBarHacked) {
         props->scrollBarDestroy.disconn();
         props->scrollBarUnrealize.disconn();
         props->scrollBarStyleSet.disconn();
         props->scrollBarValueChanged.disconn();
         props->scrollBarHacked = false;
     }
 }
 
 static gboolean
 styleSet(GtkWidget *widget, GtkStyle*, void*)
 {
     cleanup(widget);
     return false;
 }
 
 static gboolean
 destroy(GtkWidget *widget, GdkEvent*, void*)
 {
     cleanup(widget);
     return false;
 }
 
 static GtkScrolledWindow*
 parentScrolledWindow(GtkWidget *widget)
 {
     GtkWidget *parent = widget;
 
     while (parent && (parent = gtk_widget_get_parent(parent))) {
         if (GTK_IS_SCROLLED_WINDOW(parent)) {
             return GTK_SCROLLED_WINDOW(parent);
         }
     }
     return nullptr;
 }
 
 static gboolean
 valueChanged(GtkWidget *widget, GdkEventMotion*, void*)
 {
     if (GTK_IS_SCROLLBAR(widget)) {
         GtkScrolledWindow *sw = parentScrolledWindow(widget);
 
         if (sw) {
             gtk_widget_queue_draw(GTK_WIDGET(sw));
         }
     }
     return false;
 }
 
 static void
 setupSlider(GtkWidget *widget)
 {
     GtkWidgetProps props(widget);
     if (widget && !props->scrollBarHacked) {
         props->scrollBarHacked = true;
         props->scrollBarDestroy.conn("destroy-event", destroy);
         props->scrollBarUnrealize.conn("unrealize", destroy);
         props->scrollBarStyleSet.conn("style-set", styleSet);
         props->scrollBarValueChanged.conn("value-changed", valueChanged);
     }
 }
 
 void
 setup(GtkWidget *widget)
 {
     GtkScrolledWindow *sw = parentScrolledWindow(widget);
 
     if (sw) {
         GtkWidget *slider;
 
         if ((slider = gtk_scrolled_window_get_hscrollbar(sw))) {
             setupSlider(slider);
         }
         if ((slider = gtk_scrolled_window_get_vscrollbar(sw))) {
             setupSlider(slider);
         }
     }
 }
 
 }
 }