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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/frame/FrameView.h"
     29 #include "core/frame/LocalFrame.h"
     30 #include "core/html/HTMLFrameElementBase.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 }
     50 
     51 LayerType RenderPart::layerTypeRequired() const
     52 {
     53     LayerType type = RenderWidget::layerTypeRequired();
     54     if (type != NoLayer)
     55         return type;
     56     return ForcedLayer;
     57 }
     58 
     59 bool RenderPart::requiresAcceleratedCompositing() const
     60 {
     61     // There are two general cases in which we can return true. First, if this is a plugin
     62     // renderer and the plugin has a layer, then we need a layer. Second, if this is
     63     // a renderer with a contentDocument and that document needs a layer, then we need
     64     // a layer.
     65     if (widget() && widget()->isPluginView() && toPluginView(widget())->platformLayer())
     66         return true;
     67 
     68     if (!node() || !node()->isFrameOwnerElement())
     69         return false;
     70 
     71     HTMLFrameOwnerElement* element = toHTMLFrameOwnerElement(node());
     72     if (element->contentFrame() && element->contentFrame()->remotePlatformLayer())
     73         return true;
     74 
     75     if (Document* contentDocument = element->contentDocument()) {
     76         if (RenderView* view = contentDocument->renderView())
     77             return view->usesCompositing();
     78     }
     79 
     80     return false;
     81 }
     82 
     83 bool RenderPart::needsPreferredWidthsRecalculation() const
     84 {
     85     if (RenderWidget::needsPreferredWidthsRecalculation())
     86         return true;
     87     return embeddedContentBox();
     88 }
     89 
     90 bool RenderPart::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction action)
     91 {
     92     if (!widget() || !widget()->isFrameView() || !request.allowsChildFrameContent())
     93         return RenderWidget::nodeAtPoint(request, result, locationInContainer, accumulatedOffset, action);
     94 
     95     // FIXME: Until RemoteFrames use RemoteFrameViews, we need an explicit check here.
     96     if (toFrameView(widget())->frame().isRemoteFrameTemporary())
     97         return RenderWidget::nodeAtPoint(request, result, locationInContainer, accumulatedOffset, action);
     98 
     99     FrameView* childFrameView = toFrameView(widget());
    100     RenderView* childRoot = childFrameView->renderView();
    101 
    102     if (childRoot) {
    103         LayoutPoint adjustedLocation = accumulatedOffset + location();
    104         LayoutPoint contentOffset = LayoutPoint(borderLeft() + paddingLeft(), borderTop() + paddingTop()) - childFrameView->scrollOffset();
    105         HitTestLocation newHitTestLocation(locationInContainer, -adjustedLocation - contentOffset);
    106         HitTestRequest newHitTestRequest(request.type() | HitTestRequest::ChildFrameHitTest);
    107         HitTestResult childFrameResult(newHitTestLocation);
    108 
    109         bool isInsideChildFrame = childRoot->hitTest(newHitTestRequest, newHitTestLocation, childFrameResult);
    110 
    111         if (newHitTestLocation.isRectBasedTest())
    112             result.append(childFrameResult);
    113         else if (isInsideChildFrame)
    114             result = childFrameResult;
    115 
    116         if (isInsideChildFrame)
    117             return true;
    118 
    119         if (request.allowsFrameScrollbars()) {
    120             // ScrollView scrollbars are not the same as RenderLayer scrollbars tested by RenderLayer::hitTestOverflowControls,
    121             // so we need to test ScrollView scrollbars separately here.
    122             // FIXME: Consider if this test could be done unconditionally.
    123             Scrollbar* frameScrollbar = childFrameView->scrollbarAtPoint(newHitTestLocation.roundedPoint());
    124             if (frameScrollbar)
    125                 result.setScrollbar(frameScrollbar);
    126         }
    127     }
    128 
    129     return RenderWidget::nodeAtPoint(request, result, locationInContainer, accumulatedOffset, action);
    130 }
    131 
    132 CompositingReasons RenderPart::additionalCompositingReasons(CompositingTriggerFlags) const
    133 {
    134     if (requiresAcceleratedCompositing())
    135         return CompositingReasonIFrame;
    136     return CompositingReasonNone;
    137 }
    138 
    139 }
    140