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- // Copyright 2019 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 UI_ACCESSIBILITY_AX_COORDINATE_SYSTEM_H_
- #define UI_ACCESSIBILITY_AX_COORDINATE_SYSTEM_H_
- namespace ui {
- // The coordinate system of bounds or points. The origin for all coordinate
- // systems is the upper left hand corner of the region. Frame coordinates
- // correspond to the current frame and root frame coordinates are relative to
- // the topmost accessibility tree of the same type. For web content, root frame
- // coordinates are relative to the root frame of the web page. From within an
- // accessibility tree whose root is an iframe, frame coordinates are relative to
- // the region of the iframe. From an iframe leaf accessibility node, frame
- // coordinates are relative to the containing accessibility tree. For native UI,
- // frame coordinates are relative to the current window whereas root frame
- // coordinates are relative to the top-level window. The frame coordinates are
- // equivalent to the root frame coordinates when the current accessibility tree
- // is the root accessibility tree.
- // kScreenPhysicalPixels: Relative to screen space in hardware pixels
- // kScreenDIPs: Relative to screen space in device-independent pixels
- // (i.e. accounting for display DPI)
- // kRootFrame: Relative to the top-level accessibility tree of
- // the same type
- // kFrame: Relative to the current accessibility tree
- enum class AXCoordinateSystem {
- kScreenPhysicalPixels,
- kScreenDIPs,
- kRootFrame,
- kFrame
- };
- } // namespace ui
- #endif // UI_ACCESSIBILITY_AX_COORDINATE_SYSTEM_H_
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