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/*
* Copyright (C) 2006, 2007, 2008 Apple Computer, Inc. All rights reserved.
* Copyright (C) 2006 Michael Emmel mike.emmel@gmail.com
* Copyright (C) 2007, 2009 Holger Hans Peter Freyther
* Copyright (C) 2008, 2010 Collabora Ltd.
*
* 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 "ScrollView.h"
#if USE(NATIVE_GTK_MAIN_FRAME_SCROLLBAR)
#include "ChromeClient.h"
#include "FloatRect.h"
#include "Frame.h"
#include "FrameView.h"
#include "GraphicsContext.h"
#include "GtkVersioning.h"
#include "HostWindow.h"
#include "IntRect.h"
#include "MainFrameScrollbarGtk.h"
#include "Page.h"
#include "PlatformMouseEvent.h"
#include "PlatformWheelEvent.h"
#include "ScrollbarTheme.h"
#include <gtk/gtk.h>
using namespace std;
namespace WebCore {
void ScrollView::platformInit()
{
}
void ScrollView::platformDestroy()
{
m_horizontalAdjustment = 0;
m_verticalAdjustment = 0;
}
PassRefPtr<Scrollbar> ScrollView::createScrollbar(ScrollbarOrientation orientation)
{
// If this is an interior frame scrollbar, we want to create a totally fake
// scrollbar with no GtkAdjustment backing it.
if (parent())
return Scrollbar::createNativeScrollbar(this, orientation, RegularScrollbar);
// If this is the main frame, we want to create a Scrollbar that does no painting
// and defers to our GtkAdjustment for all of its state. Note that the GtkAdjustment
// may be null here.
if (orientation == HorizontalScrollbar)
return MainFrameScrollbarGtk::create(this, orientation, m_horizontalAdjustment.get());
// VerticalScrollbar
return MainFrameScrollbarGtk::create(this, orientation, m_verticalAdjustment.get());
}
void ScrollView::setHorizontalAdjustment(GtkAdjustment* hadj, bool resetValues)
{
ASSERT(!parent() || !hadj);
if (parent())
return;
m_horizontalAdjustment = hadj;
if (!m_horizontalAdjustment) {
MainFrameScrollbarGtk* hScrollbar = reinterpret_cast<MainFrameScrollbarGtk*>(horizontalScrollbar());
if (hScrollbar)
hScrollbar->detachAdjustment();
return;
}
// We may be lacking scrollbars when returning to a cached
// page, this kicks the page to recreate the scrollbars.
setHasHorizontalScrollbar(true);
MainFrameScrollbarGtk* hScrollbar = reinterpret_cast<MainFrameScrollbarGtk*>(horizontalScrollbar());
hScrollbar->attachAdjustment(m_horizontalAdjustment.get());
// We used to reset everything to 0 here, but when page cache
// is enabled we reuse FrameViews that are cached. Since their
// size is not going to change when being restored, (which is
// what would cause the upper limit in the adjusments to be
// set in the normal case), we make sure they are up-to-date
// here. This is needed for the parent scrolling widget to be
// able to report correct values.
int horizontalPageStep = max(max<int>(frameRect().width() * Scrollbar::minFractionToStepWhenPaging(), frameRect().width() - Scrollbar::maxOverlapBetweenPages()), 1);
gtk_adjustment_configure(m_horizontalAdjustment.get(),
resetValues ? 0 : scrollOffset().width(), 0,
resetValues ? 0 : contentsSize().width(),
resetValues ? 0 : Scrollbar::pixelsPerLineStep(),
resetValues ? 0 : horizontalPageStep,
resetValues ? 0 : frameRect().width());
}
void ScrollView::setVerticalAdjustment(GtkAdjustment* vadj, bool resetValues)
{
ASSERT(!parent() || !vadj);
if (parent())
return;
m_verticalAdjustment = vadj;
if (!m_verticalAdjustment) {
MainFrameScrollbarGtk* vScrollbar = reinterpret_cast<MainFrameScrollbarGtk*>(verticalScrollbar());
if (vScrollbar)
vScrollbar->detachAdjustment();
return;
}
// We may be lacking scrollbars when returning to a cached
// page, this kicks the page to recreate the scrollbars.
setHasVerticalScrollbar(true);
MainFrameScrollbarGtk* vScrollbar = reinterpret_cast<MainFrameScrollbarGtk*>(verticalScrollbar());
vScrollbar->attachAdjustment(m_verticalAdjustment.get());
// We used to reset everything to 0 here, but when page cache
// is enabled we reuse FrameViews that are cached. Since their
// size is not going to change when being restored, (which is
// what would cause the upper limit in the adjusments to be
// set in the normal case), we make sure they are up-to-date
// here. This is needed for the parent scrolling widget to be
// able to report correct values.
int verticalPageStep = max(max<int>(frameRect().width() * Scrollbar::minFractionToStepWhenPaging(), frameRect().width() - Scrollbar::maxOverlapBetweenPages()), 1);
gtk_adjustment_configure(m_verticalAdjustment.get(),
resetValues ? 0 : scrollOffset().height(), 0,
resetValues ? 0 : contentsSize().height(),
resetValues ? 0 : Scrollbar::pixelsPerLineStep(),
resetValues ? 0 : verticalPageStep,
resetValues ? 0 : frameRect().height());
}
void ScrollView::setGtkAdjustments(GtkAdjustment* hadj, GtkAdjustment* vadj, bool resetValues)
{
setHorizontalAdjustment(hadj, resetValues);
setVerticalAdjustment(vadj, resetValues);
}
IntRect ScrollView::visibleContentRect(bool includeScrollbars) const
{
// If we are an interior frame scrollbar or are in some sort of transition
// state, just calculate our size based on what the GTK+ theme says the
// scrollbar width should be.
if (parent() || !hostWindow() || !hostWindow()->platformPageClient()) {
return IntRect(IntPoint(m_scrollOffset.width(), m_scrollOffset.height()),
IntSize(max(0, m_boundsSize.width() - (verticalScrollbar() && !includeScrollbars ? verticalScrollbar()->width() : 0)),
max(0, m_boundsSize.height() - (horizontalScrollbar() && !includeScrollbars ? horizontalScrollbar()->height() : 0))));
}
// We don't have a parent, so we are the main frame and thus have
// a parent widget which we can use to measure the visible region.
GtkWidget* measuredWidget = hostWindow()->platformPageClient();
GtkWidget* parentWidget = gtk_widget_get_parent(measuredWidget);
// We may not be in a widget that displays scrollbars, but we may
// have other kinds of decoration that make us smaller.
if (parentWidget && includeScrollbars)
measuredWidget = parentWidget;
GtkAllocation allocation;
gtk_widget_get_allocation(measuredWidget, &allocation);
return IntRect(IntPoint(m_scrollOffset.width(), m_scrollOffset.height()),
IntSize(allocation.width, allocation.height));
}
void ScrollView::setScrollbarModes(ScrollbarMode horizontalMode, ScrollbarMode verticalMode, bool horizontalLock, bool verticalLock)
{
// FIXME: Restructure the ScrollView abstraction so that we do not have to
// copy this verbatim from ScrollView.cpp. Until then, we should make sure this
// is kept in sync.
bool needsUpdate = false;
if (horizontalMode != horizontalScrollbarMode() && !m_horizontalScrollbarLock) {
m_horizontalScrollbarMode = horizontalMode;
needsUpdate = true;
}
if (verticalMode != verticalScrollbarMode() && !m_verticalScrollbarLock) {
m_verticalScrollbarMode = verticalMode;
needsUpdate = true;
}
if (horizontalLock)
setHorizontalScrollbarLock();
if (verticalLock)
setVerticalScrollbarLock();
if (needsUpdate)
updateScrollbars(scrollOffset());
// We don't need to report policy changes on ScrollView's unless this
// one has an adjustment attached and it is a main frame.
if (!m_horizontalAdjustment || parent() || !isFrameView())
return;
// For frames that do have adjustments attached, we want to report
// policy changes, so that they may be applied to the widget to
// which the WebView's container (e.g. GtkScrolledWindow).
if (hostWindow())
hostWindow()->scrollbarsModeDidChange();
}
}
#endif // USE(NATIVE_GTK_MAIN_FRAME_SCROLLBAR)
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