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/*
* Copyright (C) 2023 Apple Inc. 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 INC. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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 "AccessibilityRegionContext.h"
#include "AXObjectCache.h"
#include "DocumentInlines.h"
#include "RenderBox.h"
#include "RenderBoxModelObject.h"
#include "RenderInline.h"
#include "RenderLineBreak.h"
#include "RenderStyleInlines.h"
#include "RenderText.h"
#include "RenderView.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
WTF_MAKE_TZONE_ALLOCATED_IMPL(AccessibilityRegionContext);
AccessibilityRegionContext::~AccessibilityRegionContext()
{
WeakPtr<AXObjectCache> cache;
// Release all accumulated RenderText frames to the cache.
for (auto renderTextToFrame : m_accumulatedRenderTextRects) {
if (!cache) {
// Use this RenderText to get to the "canonical" AXObjectCache (attached to the page).
cache = renderTextToFrame.key.document().axObjectCache();
}
if (cache) {
// Every RenderText should reference the same AXObjectCache (the canonical one).
ASSERT(cache.get() == renderTextToFrame.key.document().axObjectCache());
cache->onPaint(renderTextToFrame.key, enclosingIntRect(renderTextToFrame.value));
}
}
}
void AccessibilityRegionContext::takeBounds(const RenderInline& renderInline, LayoutRect&& paintRect)
{
takeBoundsInternal(renderInline, enclosingIntRect(mapRect(WTFMove(paintRect))));
}
void AccessibilityRegionContext::takeBounds(const RenderBox& renderBox, LayoutPoint paintOffset)
{
if (CheckedPtr renderView = dynamicDowncast<RenderView>(renderBox); renderView) [[unlikely]] {
takeBounds(*renderView, WTFMove(paintOffset));
return;
}
auto mappedPaintRect = enclosingIntRect(mapRect(LayoutRect(paintOffset, renderBox.size())));
takeBoundsInternal(renderBox, WTFMove(mappedPaintRect));
}
void AccessibilityRegionContext::takeBounds(const RenderView& renderView, LayoutPoint&& paintOffset)
{
// RenderView::documentRect applies necessary transforms. Intentionally do not apply the clips stored in this context since accessibility
// expects the size to be that of the full document (not the size of the current viewport).
auto documentRect = renderView.documentRect();
documentRect.moveBy(roundedIntPoint(paintOffset));
takeBoundsInternal(renderView, WTFMove(documentRect));
}
void AccessibilityRegionContext::takeBounds(const RenderBox& renderBox, FloatRect paintRect)
{
auto mappedPaintRect = enclosingIntRect(mapRect(paintRect));
takeBoundsInternal(renderBox, WTFMove(mappedPaintRect));
}
void AccessibilityRegionContext::takeBounds(const RenderLineBreak* renderLineBreak, const LayoutPoint& paintOffset)
{
if (!renderLineBreak)
return;
auto mappedPaintRect = renderLineBreak->linesBoundingBox();
mappedPaintRect.moveBy(roundedIntPoint(paintOffset));
// We want <br>s to have non-empty rects so that something is drawn when they are navigated to by-line by
// ATs like VoiceOver. Make them at least 2px so they roughly match the size of a cursor in either horizontal
// or vertical writing modes (matching CaretRectComputation::caretWidth).
if (!mappedPaintRect.width())
mappedPaintRect.setWidth(2);
if (!mappedPaintRect.height())
mappedPaintRect.setHeight(2);
takeBoundsInternal(*renderLineBreak, WTFMove(mappedPaintRect));
}
void AccessibilityRegionContext::takeBoundsInternal(const RenderBoxModelObject& renderObject, IntRect&& paintRect)
{
if (RefPtr view = renderObject.document().view())
paintRect = view->contentsToRootView(paintRect);
if (auto* cache = renderObject.document().axObjectCache())
cache->onPaint(renderObject, WTFMove(paintRect));
}
// Note that this function takes the bounds of a textbox that is associated with a RenderText, and not the RenderText itself.
// RenderTexts are not painted atomically. Instead, they are painted as multiple `InlineIterator::TextBox`s, where a textbox might represent
// the text on a single line. This method takes the paint rect of a single textbox and unites it with the other textbox rects painted for |renderText|.
void AccessibilityRegionContext::takeBounds(const RenderText& renderText, FloatRect paintRect, size_t lineIndex)
{
auto mappedPaintRect = enclosingIntRect(mapRect(WTFMove(paintRect)));
if (RefPtr view = renderText.document().view())
mappedPaintRect = view->contentsToRootView(mappedPaintRect);
auto accumulatedRectIterator = m_accumulatedRenderTextRects.find(renderText);
if (accumulatedRectIterator == m_accumulatedRenderTextRects.end())
m_accumulatedRenderTextRects.set(renderText, mappedPaintRect);
else
accumulatedRectIterator->value.unite(mappedPaintRect);
if (CheckedPtr cache = renderText.document().axObjectCache()) {
// Note that the line-index provided here is relative to the containing-block, which could include lines
// belonging to other RenderTexts. Concretely, this means the first painted line for |renderText| could
// have a line index greater than zero. We adjust this later in AXObjectCache::onAccessibilityPaintFinished.
cache->onPaint(renderText, lineIndex);
}
}
void AccessibilityRegionContext::onPaint(const ScrollView& scrollView)
{
auto* frameView = dynamicDowncast<LocalFrameView>(scrollView);
if (!frameView) {
// We require a frameview here because ScrollView has no existing mechanism to get an associated document,
// and we need that to make the frame viewport-relative and to get an AXObjectCache.
ASSERT_NOT_REACHED_WITH_MESSAGE("Tried to paint a scrollview that was not a frameview, so no frame will be computed");
return;
}
auto relativeFrame = frameView->frameRectShrunkByInset();
// Only normalize the rect to the root view if this scrollview isn't already associated with the root view (i.e. it has a frame owner).
if (RefPtr frameOwnerElement = frameView->frame().ownerElement()) {
if (RefPtr ownerDocumentFrameView = frameOwnerElement->document().view())
relativeFrame = ownerDocumentFrameView->contentsToRootView(relativeFrame);
}
if (auto* cache = frameView->axObjectCache())
cache->onPaint(*frameView, WTFMove(relativeFrame));
}
} // namespace WebCore
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