/*

 * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.

 * Copyright (C) 2007 Holger Hans Peter Freyther zecke@selfish.org

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

 */

#include "config.h"

#include "PlatformScrollBar.h"

#include "IntRect.h"

#include "GraphicsContext.h"

#include "FrameView.h"

#include "NotImplemented.h"

#include <gtk/gtk.h>

#include <cairo/cairo.h>

#include <stdio.h>

using namespace WebCore;

PlatformScrollbar::PlatformScrollbar(ScrollbarClient* client, ScrollbarOrientation orientation,

                                     ScrollbarControlSize controlSize)

    : Scrollbar(client, orientation, controlSize)

    , m_adjustment(GTK_ADJUSTMENT(gtk_adjustment_new(0.0, 0.0, 0.0, 0.0, 0.0, 0.0)))

{ 

    GtkScrollbar* scrollBar = orientation == HorizontalScrollbar ?

                              GTK_SCROLLBAR(::gtk_hscrollbar_new(m_adjustment)) :

                              GTK_SCROLLBAR(::gtk_vscrollbar_new(m_adjustment));

    gtk_widget_show(GTK_WIDGET(scrollBar));

    g_object_ref(G_OBJECT(scrollBar));

    g_signal_connect(G_OBJECT(scrollBar), "value-changed", G_CALLBACK(PlatformScrollbar::gtkValueChanged), this);

    setGtkWidget(GTK_WIDGET(scrollBar));

    /*

     * assign a sane default width and height to the ScrollBar, otherwise

     * we will end up with a 0 width scrollbar.

     */

    resize(PlatformScrollbar::horizontalScrollbarHeight(),

           PlatformScrollbar::verticalScrollbarWidth());    

}

PlatformScrollbar::~PlatformScrollbar()

{

    /*

     * the Widget does not take over ownership.

     */

    g_signal_handlers_disconnect_by_func(G_OBJECT(gtkWidget()), (gpointer)PlatformScrollbar::gtkValueChanged, this);

    g_object_unref(G_OBJECT(gtkWidget()));

}

int PlatformScrollbar::width() const

{

    return Widget::width();

}

int PlatformScrollbar::height() const

{

    return Widget::height();

}

void PlatformScrollbar::setEnabled(bool enabled)

{

    Widget::setEnabled(enabled);

}

void PlatformScrollbar::paint(GraphicsContext* graphicsContext, const IntRect& damageRect)

{

    Widget::paint(graphicsContext, damageRect);

}

void PlatformScrollbar::updateThumbPosition()

{ 

    if (m_adjustment->value != m_currentPos) {

        m_adjustment->value = m_currentPos;

        gtk_adjustment_value_changed(m_adjustment);

    }

}

void PlatformScrollbar::updateThumbProportion()

{

    m_adjustment->step_increment = m_lineStep;

    m_adjustment->page_increment = m_pageStep;

    m_adjustment->page_size = m_visibleSize;

    m_adjustment->upper = m_totalSize;

    gtk_adjustment_changed(m_adjustment);

}

void PlatformScrollbar::setRect(const IntRect& rect)

{

    setFrameGeometry(rect);

    geometryChanged();

}

void PlatformScrollbar::geometryChanged()

{

    if (!parent())

        return;

    ASSERT(parent()->isFrameView());

    FrameView* frameView = static_cast<FrameView*>(parent());

    IntRect windowRect = IntRect(frameView->contentsToWindow(frameGeometry().location()), frameGeometry().size());

    GtkAllocation allocation = { windowRect.x(), windowRect.y(), windowRect.width(), windowRect.height() };

    gtk_widget_size_allocate(gtkWidget(), &allocation);

}

void PlatformScrollbar::gtkValueChanged(GtkAdjustment*, PlatformScrollbar* that)

{

    that->setValue(gtk_adjustment_get_value(that->m_adjustment));

}