1/*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 *           (C) 2000 Simon Hausmann <hausmann@kde.org>
4 *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
5 * Copyright (C) 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
6 * Copyright (C) Research In Motion Limited 2011. All rights reserved.
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * Library General Public License for more details.
17 *
18 * You should have received a copy of the GNU Library General Public License
19 * along with this library; see the file COPYING.LIB.  If not, write to
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
22 *
23 */
24
25#include "config.h"
26#include "core/rendering/RenderPart.h"
27
28#include "core/html/HTMLFrameElementBase.h"
29#include "core/page/Frame.h"
30#include "core/page/FrameView.h"
31#include "core/plugins/PluginView.h"
32#include "core/rendering/HitTestResult.h"
33#include "core/rendering/RenderLayer.h"
34#include "core/rendering/RenderView.h"
35#include "core/rendering/svg/RenderSVGRoot.h"
36
37using namespace std;
38
39namespace WebCore {
40
41RenderPart::RenderPart(Element* node)
42    : RenderWidget(node)
43{
44    setInline(false);
45}
46
47RenderPart::~RenderPart()
48{
49    clearWidget();
50}
51
52void RenderPart::setWidget(PassRefPtr<Widget> widget)
53{
54    if (widget == this->widget())
55        return;
56
57    RenderWidget::setWidget(widget);
58
59    // make sure the scrollbars are set correctly for restore
60    // ### find better fix
61    viewCleared();
62}
63
64void RenderPart::viewCleared()
65{
66}
67
68bool RenderPart::requiresLayer() const
69{
70    if (RenderWidget::requiresLayer())
71        return true;
72
73    return requiresAcceleratedCompositing();
74}
75
76bool RenderPart::requiresAcceleratedCompositing() const
77{
78    // There are two general cases in which we can return true. First, if this is a plugin
79    // renderer and the plugin has a layer, then we need a layer. Second, if this is
80    // a renderer with a contentDocument and that document needs a layer, then we need
81    // a layer.
82    if (widget() && widget()->isPluginView() && toPluginView(widget())->platformLayer())
83        return true;
84
85    if (!node() || !node()->isFrameOwnerElement())
86        return false;
87
88    HTMLFrameOwnerElement* element = toFrameOwnerElement(node());
89    if (Document* contentDocument = element->contentDocument()) {
90        if (RenderView* view = contentDocument->renderView())
91            return view->usesCompositing();
92    }
93
94    return false;
95}
96
97bool RenderPart::needsPreferredWidthsRecalculation() const
98{
99    if (RenderWidget::needsPreferredWidthsRecalculation())
100        return true;
101    return embeddedContentBox();
102}
103
104RenderBox* RenderPart::embeddedContentBox() const
105{
106    if (!node() || !widget() || !widget()->isFrameView())
107        return 0;
108    return toFrameView(widget())->embeddedContentBox();
109}
110
111bool RenderPart::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction action)
112{
113    if (!widget() || !widget()->isFrameView() || !request.allowsChildFrameContent())
114        return RenderWidget::nodeAtPoint(request, result, locationInContainer, accumulatedOffset, action);
115
116    FrameView* childFrameView = toFrameView(widget());
117    RenderView* childRoot = childFrameView->renderView();
118
119    if (childRoot) {
120        LayoutPoint adjustedLocation = accumulatedOffset + location();
121        LayoutPoint contentOffset = LayoutPoint(borderLeft() + paddingLeft(), borderTop() + paddingTop()) - childFrameView->scrollOffset();
122        HitTestLocation newHitTestLocation(locationInContainer, -adjustedLocation - contentOffset);
123        HitTestRequest newHitTestRequest(request.type() | HitTestRequest::ChildFrameHitTest);
124        HitTestResult childFrameResult(newHitTestLocation);
125
126        bool isInsideChildFrame = childRoot->hitTest(newHitTestRequest, newHitTestLocation, childFrameResult);
127
128        if (newHitTestLocation.isRectBasedTest())
129            result.append(childFrameResult);
130        else if (isInsideChildFrame)
131            result = childFrameResult;
132
133        if (isInsideChildFrame)
134            return true;
135
136        if (request.allowsFrameScrollbars()) {
137            // ScrollView scrollbars are not the same as RenderLayer scrollbars tested by RenderLayer::hitTestOverflowControls,
138            // so we need to test ScrollView scrollbars separately here.
139            // FIXME: Consider if this test could be done unconditionally.
140            Scrollbar* frameScrollbar = childFrameView->scrollbarAtPoint(newHitTestLocation.roundedPoint());
141            if (frameScrollbar)
142                result.setScrollbar(frameScrollbar);
143        }
144    }
145
146    return RenderWidget::nodeAtPoint(request, result, locationInContainer, accumulatedOffset, action);
147}
148
149}
150