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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_COMMON_ACCESSIBILITY_NODE_DATA_H_
#define CONTENT_COMMON_ACCESSIBILITY_NODE_DATA_H_
#include <map>
#include <string>
#include <vector>
#include "base/strings/string16.h"
#include "content/common/content_export.h"
#include "third_party/WebKit/public/web/WebAXEnums.h"
#include "ui/gfx/rect.h"
namespace content {
// A compact representation of the accessibility information for a
// single web object, in a form that can be serialized and sent from
// the renderer process to the browser process.
struct CONTENT_EXPORT AccessibilityNodeData {
// Additional optional attributes that can be optionally attached to
// a node.
enum StringAttribute {
// Document attributes.
ATTR_DOC_URL,
ATTR_DOC_TITLE,
ATTR_DOC_MIMETYPE,
ATTR_DOC_DOCTYPE,
// Attributes that could apply to any node.
ATTR_ACCESS_KEY,
ATTR_ACTION,
ATTR_CONTAINER_LIVE_RELEVANT,
ATTR_CONTAINER_LIVE_STATUS,
ATTR_DESCRIPTION,
ATTR_DISPLAY,
ATTR_HELP,
ATTR_HTML_TAG,
ATTR_NAME,
ATTR_LIVE_RELEVANT,
ATTR_LIVE_STATUS,
ATTR_ROLE,
ATTR_SHORTCUT,
ATTR_URL,
ATTR_VALUE,
};
enum IntAttribute {
// Scrollable container attributes.
ATTR_SCROLL_X,
ATTR_SCROLL_X_MIN,
ATTR_SCROLL_X_MAX,
ATTR_SCROLL_Y,
ATTR_SCROLL_Y_MIN,
ATTR_SCROLL_Y_MAX,
// Editable text attributes.
ATTR_TEXT_SEL_START,
ATTR_TEXT_SEL_END,
// Table attributes.
ATTR_TABLE_ROW_COUNT,
ATTR_TABLE_COLUMN_COUNT,
ATTR_TABLE_HEADER_ID,
// Table row attributes.
ATTR_TABLE_ROW_INDEX,
ATTR_TABLE_ROW_HEADER_ID,
// Table column attributes.
ATTR_TABLE_COLUMN_INDEX,
ATTR_TABLE_COLUMN_HEADER_ID,
// Table cell attributes.
ATTR_TABLE_CELL_COLUMN_INDEX,
ATTR_TABLE_CELL_COLUMN_SPAN,
ATTR_TABLE_CELL_ROW_INDEX,
ATTR_TABLE_CELL_ROW_SPAN,
// Tree control attributes.
ATTR_HIERARCHICAL_LEVEL,
// Relationships between this element and other elements.
ATTR_TITLE_UI_ELEMENT,
// Color value for WebKit::WebAXRoleColorWell, each component is 0..255
ATTR_COLOR_VALUE_RED,
ATTR_COLOR_VALUE_GREEN,
ATTR_COLOR_VALUE_BLUE
};
enum FloatAttribute {
// Document attributes.
ATTR_DOC_LOADING_PROGRESS,
// Range attributes.
ATTR_VALUE_FOR_RANGE,
ATTR_MIN_VALUE_FOR_RANGE,
ATTR_MAX_VALUE_FOR_RANGE,
};
enum BoolAttribute {
// Document attributes.
ATTR_DOC_LOADED,
// True if a checkbox or radio button is in the "mixed" state.
ATTR_BUTTON_MIXED,
// Live region attributes.
ATTR_CONTAINER_LIVE_ATOMIC,
ATTR_CONTAINER_LIVE_BUSY,
ATTR_LIVE_ATOMIC,
ATTR_LIVE_BUSY,
// ARIA readonly flag.
ATTR_ARIA_READONLY,
// Writeable attributes
ATTR_CAN_SET_VALUE,
// If this is set, all of the other fields in this struct should
// be ignored and only the locations should change.
ATTR_UPDATE_LOCATION_ONLY,
// Set on a canvas element if it has fallback content.
ATTR_CANVAS_HAS_FALLBACK,
};
enum IntListAttribute {
// Ids of nodes that are children of this node logically, but are
// not children of this node in the tree structure. As an example,
// a table cell is a child of a row, and an 'indirect' child of a
// column.
ATTR_INDIRECT_CHILD_IDS,
// Character indices where line breaks occur.
ATTR_LINE_BREAKS,
// For a table, the cell ids in row-major order, with duplicate entries
// when there's a rowspan or colspan, and with -1 for missing cells.
// There are always exactly rows * columns entries.
ATTR_CELL_IDS,
// For a table, the unique cell ids in row-major order of their first
// occurrence.
ATTR_UNIQUE_CELL_IDS
};
AccessibilityNodeData();
virtual ~AccessibilityNodeData();
void AddStringAttribute(StringAttribute attribute,
const std::string& value);
void AddIntAttribute(IntAttribute attribute, int value);
void AddFloatAttribute(FloatAttribute attribute, float value);
void AddBoolAttribute(BoolAttribute attribute, bool value);
void AddIntListAttribute(IntListAttribute attribute,
const std::vector<int32>& value);
// Convenience function, mainly for writing unit tests.
// Equivalent to AddStringAttribute(ATTR_NAME, name).
void SetName(std::string name);
#ifndef NDEBUG
virtual std::string DebugString(bool recursive) const;
#endif
// This is a simple serializable struct. All member variables should be
// public and copyable.
int32 id;
WebKit::WebAXRole role;
uint32 state;
gfx::Rect location;
std::vector<std::pair<StringAttribute, std::string> > string_attributes;
std::vector<std::pair<IntAttribute, int32> > int_attributes;
std::vector<std::pair<FloatAttribute, float> > float_attributes;
std::vector<std::pair<BoolAttribute, bool> > bool_attributes;
std::vector<std::pair<IntListAttribute, std::vector<int32> > >
intlist_attributes;
std::vector<std::pair<std::string, std::string> > html_attributes;
std::vector<int32> child_ids;
};
// For testing and debugging only: this subclass of AccessibilityNodeData
// is used to represent a whole tree of accessibility nodes, where each
// node owns its children. This makes it easy to print the tree structure
// or search it recursively.
struct CONTENT_EXPORT AccessibilityNodeDataTreeNode
: public AccessibilityNodeData {
AccessibilityNodeDataTreeNode();
virtual ~AccessibilityNodeDataTreeNode();
AccessibilityNodeDataTreeNode& operator=(const AccessibilityNodeData& src);
#ifndef NDEBUG
virtual std::string DebugString(bool recursive) const OVERRIDE;
#endif
std::vector<AccessibilityNodeDataTreeNode> children;
};
// Given a vector of accessibility nodes that represent a complete
// accessibility tree, where each node appears before its children,
// build a tree of AccessibilityNodeDataTreeNode objects for easier
// testing and debugging, where each node contains its children.
// The |dst| argument will become the root of the new tree.
void MakeAccessibilityNodeDataTree(
const std::vector<AccessibilityNodeData>& src,
AccessibilityNodeDataTreeNode* dst);
} // namespace content
#endif // CONTENT_COMMON_ACCESSIBILITY_NODE_DATA_H_
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