Expose InlineTextBoxes in the accessibility tree.

Source/core/accessibility/AccessibilityInlineTextBox.cpp

+/*
+ * Copyright (C) 2013, Google 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.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE 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 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 "core/accessibility/AccessibilityInlineTextBox.h"
+
+#include "core/accessibility/AXObjectCache.h"
+#include "core/dom/Range.h"
+#include "core/rendering/RenderText.h"
+#include "platform/LayoutUnit.h"
+
+using namespace std;
+
+namespace WebCore {
+
+using namespace HTMLNames;
+
+AccessibilityInlineTextBox::AccessibilityInlineTextBox(PassRefPtr<AbstractInlineTextBox> inlineTextBox)
+    : m_inlineTextBox(inlineTextBox)
+{
+    RenderText* renderText = m_inlineTextBox->renderText();
+    m_axObjectCache = renderText->document().axObjectCache();

[eseidel, 2013/10/17 18:43:26]

Interesting that all of these objects each hold a separate pointer to the
AXObjectCAche.

[dmazzoni, 2013/10/17 20:39:20]

That isn't normally needed. Normally we find it from the object's document - but
we need it here because the object we're referencing might be nulled.

It's safe for this to be a raw ptr because AXObjectCache always calls detach()
on every one of its AXObjects when it's destroyed.

+}
+
+AccessibilityInlineTextBox::~AccessibilityInlineTextBox()
+{
+    if (m_axObjectCache && m_inlineTextBox.get())

[eseidel, 2013/10/17 18:43:26]

You should be able to just write && m_inlineTextBox and the bool operator will
do the right thing.

[dmazzoni, 2013/10/17 20:39:20]

Done.

+        m_axObjectCache->remove(m_inlineTextBox.get());
+}
+
+PassRefPtr<AccessibilityInlineTextBox> AccessibilityInlineTextBox::create(PassRefPtr<AbstractInlineTextBox> inlineTextBox)
+{
+    return adoptRef(new AccessibilityInlineTextBox(inlineTextBox));
+}
+
+void AccessibilityInlineTextBox::init()
+{
+}
+
+void AccessibilityInlineTextBox::detach()
+{
+    m_inlineTextBox = 0;
+    m_axObjectCache = 0;
+    AccessibilityObject::detach();
+}
+
+LayoutRect AccessibilityInlineTextBox::elementRect() const
+{
+    if (!m_inlineTextBox)
+        return LayoutRect();
+
+    return m_inlineTextBox->bounds();
+}
+
+bool AccessibilityInlineTextBox::computeAccessibilityIsIgnored() const
+{
+    if (AccessibilityObject* parent = parentObject())
+        return parent->accessibilityIsIgnored();
+
+    return false;
+}
+
+void AccessibilityInlineTextBox::textCharacterOffsets(Vector<int>& offsets) const
+{
+    if (!m_inlineTextBox)
+        return;
+
+    unsigned len = m_inlineTextBox->len();
+    Vector<float> widths;
+    m_inlineTextBox->characterWidths(widths);
+    ASSERT(widths.size() == len);
+    offsets.resize(len);
+
+    float widthSoFar = 0;
+    for (unsigned i = 0; i < len; i++) {
+        widthSoFar += widths[i];
+        offsets[i] = LayoutUnit::fromFloatRound(widthSoFar);
+    }
+}
+
+void AccessibilityInlineTextBox::wordBoundaries(Vector<PlainTextRange>& words) const
+{
+    if (!m_inlineTextBox)
+        return;
+
+    Vector<AbstractInlineTextBox::WordBoundaries> wordBoundaries;
+    m_inlineTextBox->wordBoundaries(wordBoundaries);
+    words.resize(wordBoundaries.size());
+    for (unsigned i = 0; i < wordBoundaries.size(); i++)
+        words[i] = PlainTextRange(wordBoundaries[i].startIndex, wordBoundaries[i].endIndex - wordBoundaries[i].startIndex);
+}
+
+String AccessibilityInlineTextBox::stringValue() const
+{
+    if (!m_inlineTextBox)
+        return String();
+
+    return m_inlineTextBox->text();
+}
+
+AccessibilityObject* AccessibilityInlineTextBox::parentObject() const
+{
+    if (!m_inlineTextBox || !m_axObjectCache)
+        return 0;
+
+    RenderText* renderText = m_inlineTextBox->renderText();
+    return m_axObjectCache->getOrCreate(renderText);
+}
+
+AccessibilityTextDirection AccessibilityInlineTextBox::textDirection() const
+{
+    if (!m_inlineTextBox)
+        return AccessibilityTextDirectionLR;
+
+    switch (m_inlineTextBox->direction()) {
+    case AbstractInlineTextBoxDirectionLR:
+        return AccessibilityTextDirectionLR;
+    case AbstractInlineTextBoxDirectionRL:
+        return AccessibilityTextDirectionRL;
+    case AbstractInlineTextBoxDirectionTB:
+        return AccessibilityTextDirectionTB;
+    case AbstractInlineTextBoxDirectionBT:
+        return AccessibilityTextDirectionBT;
+    }
+
+    return AccessibilityTextDirectionLR;
+}
+
+} // namespace WebCore