Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 238 insertions, 0 deletions

diff --git a/Source/WebCore/platform/gtk/ScrollViewGtk.cpp b/Source/WebCore/platform/gtk/ScrollViewGtk.cpp
new file mode 100644
index 0000000..a8c7562
--- /dev/null
+++ b/Source/WebCore/platform/gtk/ScrollViewGtk.cpp
@@ -0,0 +1,238 @@
+/*
+ * 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"
+
+#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);
+}
+
+void ScrollView::platformAddChild(Widget* child)
+{
+}
+
+void ScrollView::platformRemoveChild(Widget* child)
+{
+}
+
+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, width() - (verticalScrollbar() && !includeScrollbars ? verticalScrollbar()->width() : 0)),
+                               max(0, 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();
+}
+
+}