// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library fuchsia.accessibility.semantics;

using fuchsia.ui.gfx;

// TODO(SCN-814) Figure out how we want to serialize data.

/// Represents the purpose of a ui element; ex. button, text area.
/// Currently not being used. Will be expanded in the future.
enum Role {
    NONE = 0;
};

/// Represents actions that can be applied to Nodes.
enum Action {
    GAIN_ACCESSIBILITY_FOCUS = 1;
    LOSE_ACCESSIBILITY_FOCUS = 2;
    TAP = 3;
};

/// Accessibility data for an UI element.
table Data {
    1: Role role;
    2: string label;
    // Local bounding box of this element.
    3: fuchsia.ui.gfx.BoundingBox location;
    // Transform from parent coordinate space to local space.
    4: fuchsia.ui.gfx.mat4 transform;
};

// Wrapper for accessibility data to store structure of UI tree. In progress.
table Node {
    // Node id identifying position in a front-end's local UI structure.
    // We assume 0 to be the root node.
    1: uint32 node_id;
    2: vector<uint32> children_traversal_order;
    3: vector<uint32> children_hit_test_order;
    4: Data data;
};