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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 2000 Simon Hausmann <hausmann (at) kde.org>
      4  *           (C) 2000 Stefan Schimanski (1Stein (at) 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 
     37 using namespace std;
     38 
     39 namespace WebCore {
     40 
     41 RenderPart::RenderPart(Element* node)
     42     : RenderWidget(node)
     43 {
     44     setInline(false);
     45 }
     46 
     47 RenderPart::~RenderPart()
     48 {
     49     clearWidget();
     50 }
     51 
     52 void 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 
     64 void RenderPart::viewCleared()
     65 {
     66 }
     67 
     68 bool RenderPart::requiresLayer() const
     69 {
     70     if (RenderWidget::requiresLayer())
     71         return true;
     72 
     73     return requiresAcceleratedCompositing();
     74 }
     75 
     76 bool 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 
     97 bool RenderPart::needsPreferredWidthsRecalculation() const
     98 {
     99     if (RenderWidget::needsPreferredWidthsRecalculation())
    100         return true;
    101     return embeddedContentBox();
    102 }
    103 
    104 RenderBox* RenderPart::embeddedContentBox() const
    105 {
    106     if (!node() || !widget() || !widget()->isFrameView())
    107         return 0;
    108     return toFrameView(widget())->embeddedContentBox();
    109 }
    110 
    111 bool 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