Expose InlineTextBoxes in the accessibility tree.

Source/core/rendering/AbstractInlineTextBox.h

+/*
+ * 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER OR 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.
+ */
+
+#ifndef AbstractInlineTextBox_h
+#define AbstractInlineTextBox_h
+
+#include "core/dom/Range.h"
+#include "core/rendering/InlineTextBox.h"
+#include "core/rendering/RenderText.h"
+#include "wtf/HashMap.h"
+#include "wtf/RefPtr.h"
+
+namespace WebCore {
+
+class InlineTextBox;
+
+// High-level abstraction of InlineTextBox to allow the accessibility module to
+// get information about InlineTextBoxes without tight coupling.
+class AbstractInlineTextBox : public RefCounted<AbstractInlineTextBox> {
+private:
+    AbstractInlineTextBox(RenderText* renderText, InlineTextBox* inlineTextBox)
+        : m_renderText(renderText)
+        , m_inlineTextBox(inlineTextBox)
+    {
+    }
+
+    static PassRefPtr<AbstractInlineTextBox> getOrCreate(RenderText*, InlineTextBox*);
+    static void willDestroy(InlineTextBox*);
+
+    friend class RenderText;
+    friend class InlineTextBox;
+
+public:
+    struct WordBoundaries {
+        WordBoundaries(int startIndex, int endIndex) : startIndex(startIndex), endIndex(endIndex) { }
+        int startIndex;
+        int endIndex;
+    };
+
+    enum Direction {
+        LeftToRight,
+        RightToLeft,
+        TopToBottom,
+        BottomToTop
+    };
+
+    RenderText* renderText() const { return m_renderText; }
+
+    PassRefPtr<AbstractInlineTextBox> nextInlineTextBox() const;
+    LayoutRect bounds() const;
+    unsigned start() const;
+    unsigned len() const;
+    Direction direction() const;
+    void characterWidths(Vector<float>&) const;
+    void wordBoundaries(Vector<WordBoundaries>&) const;
+    String text() const;
+
+private:
+    void detach();
+
+    // Weak ptrs; these are nulled when InlineTextBox::destroy() calls AbstractInlineTextBox::willDestroy.
+    RenderText* m_renderText;
+    InlineTextBox* m_inlineTextBox;
+
+    typedef HashMap<InlineTextBox*, RefPtr<AbstractInlineTextBox> > InlineToAbstractInlineTextBoxHashMap;
+    static InlineToAbstractInlineTextBoxHashMap* gAbstractInlineTextBoxMap;
+};
+
+} // namespace WebCore
+
+#endif // AbstractInlineTextBox_h