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/*
* Copyright (C) 2011 Igalia S.L.
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "GtkAdjustmentWatcher.h"
#include "Frame.h"
#include "FrameView.h"
#include "Page.h"
#include "Scrollbar.h"
#include "webkitwebviewprivate.h"
#include <gtk/gtk.h>
using namespace WebCore;
namespace WebKit {
GtkAdjustmentWatcher::GtkAdjustmentWatcher(WebKitWebView* webView)
: m_webView(webView)
, m_scrollbarsDisabled(false)
, m_handlingGtkAdjustmentChange(false)
, m_updateAdjustmentCallbackId(0)
{
}
GtkAdjustmentWatcher::~GtkAdjustmentWatcher()
{
if (m_updateAdjustmentCallbackId)
g_source_remove(m_updateAdjustmentCallbackId);
}
static void updateAdjustmentFromScrollbar(GtkAdjustment* adjustment, Scrollbar* scrollbar)
{
if (!adjustment)
return;
if (!scrollbar) {
gtk_adjustment_configure(adjustment, 0, 0, 0, 0, 0, 0); // These are the settings which remove the scrollbar.
return;
}
gtk_adjustment_configure(adjustment, scrollbar->value(), 0, scrollbar->totalSize(),
scrollbar->lineStep(), scrollbar->pageStep(), scrollbar->visibleSize());
}
void GtkAdjustmentWatcher::updateAdjustmentsFromScrollbars()
{
if (m_scrollbarsDisabled)
return;
if (m_handlingGtkAdjustmentChange)
return;
if (!core(m_webView) || !core(m_webView)->mainFrame())
return;
FrameView* frameView = core(m_webView)->mainFrame()->view();
updateAdjustmentFromScrollbar(m_horizontalAdjustment.get(), frameView->horizontalScrollbar());
updateAdjustmentFromScrollbar(m_verticalAdjustment.get(), frameView->verticalScrollbar());
if (m_updateAdjustmentCallbackId) {
g_source_remove(m_updateAdjustmentCallbackId);
m_updateAdjustmentCallbackId = 0;
}
}
gboolean GtkAdjustmentWatcher::updateAdjustmentCallback(GtkAdjustmentWatcher* watcher)
{
watcher->m_updateAdjustmentCallbackId = 0;
watcher->updateAdjustmentsFromScrollbars();
return FALSE;
}
void GtkAdjustmentWatcher::updateAdjustmentsFromScrollbarsLater() const
{
// We've already scheduled an update. No need to schedule another.
if (m_updateAdjustmentCallbackId || m_scrollbarsDisabled)
return;
// The fact that this method was called means that we need to update the scrollbars, but at the
// time of invocation they are not updated to reflect the scroll yet. We set a short timeout
// here, which means that they will be updated as soon as WebKit returns to the main loop.
m_updateAdjustmentCallbackId = g_timeout_add(0, reinterpret_cast<GSourceFunc>(updateAdjustmentCallback),
const_cast<void*>(static_cast<const void*>(this)));
}
static void adjustmentValueChangedCallback(GtkAdjustment* adjustment, GtkAdjustmentWatcher* watcher)
{
watcher->adjustmentValueChanged(adjustment);
}
static void setAdjustment(GtkAdjustmentWatcher* watcher, GRefPtr<GtkAdjustment>& adjustmentMember, GtkAdjustment* newAdjustment)
{
if (adjustmentMember) {
g_signal_handlers_disconnect_by_func(adjustmentMember.get(),
reinterpret_cast<void*>(adjustmentValueChangedCallback), watcher);
}
adjustmentMember = newAdjustment;
if (newAdjustment)
g_signal_connect(newAdjustment, "value-changed", G_CALLBACK(adjustmentValueChangedCallback), watcher);
}
void GtkAdjustmentWatcher::setHorizontalAdjustment(GtkAdjustment* newAdjustment)
{
setAdjustment(this, m_horizontalAdjustment, newAdjustment);
}
void GtkAdjustmentWatcher::setVerticalAdjustment(GtkAdjustment* newAdjustment)
{
setAdjustment(this, m_verticalAdjustment, newAdjustment);
}
void GtkAdjustmentWatcher::adjustmentValueChanged(GtkAdjustment* adjustment)
{
FrameView* frameView = core(m_webView)->mainFrame()->view();
Scrollbar* scrollbar = (adjustment == m_horizontalAdjustment.get()) ?
frameView->horizontalScrollbar() : frameView->verticalScrollbar();
if (!scrollbar)
return;
int newValue = static_cast<int>(gtk_adjustment_get_value(adjustment));
if (newValue != scrollbar->value()) {
m_handlingGtkAdjustmentChange = true;
frameView->scrollToOffsetWithoutAnimation(scrollbar->orientation(), newValue);
m_handlingGtkAdjustmentChange = false;
}
}
void GtkAdjustmentWatcher::disableAllScrollbars()
{
updateAdjustmentFromScrollbar(m_horizontalAdjustment.get(), 0);
updateAdjustmentFromScrollbar(m_verticalAdjustment.get(), 0);
m_scrollbarsDisabled = true;
}
void GtkAdjustmentWatcher::enableAllScrollbars()
{
m_scrollbarsDisabled = false;
updateAdjustmentsFromScrollbars();
}
} // namespace WebKit
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