public/fidl/fuchsia.accessibility/data.fidl

// 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;

using fuchsia.ui.gfx;

// Represents the data needed to identify a specific ui element.
// TODO(SCN-814) Figure out how we want to serialize data.
// Starting with a very small selection of fields for testing.

// 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 = 0;
    LOSE_ACCESSIBILITY_FOCUS = 1;
    TAP = 2;
};

// Accessibility data for an UI element. In progress.
struct Data {
    Role role;
    string label;
    // Local bounding box of this element.
    fuchsia.ui.gfx.BoundingBox location;
    // Transform from parent coordinate space to local space.
    fuchsia.ui.gfx.mat4 transform;
};

// Wrapper for accessibility data to store structure of UI tree. In progress.
struct Node {
    // Node id identifying position in a front-end's local UI structure.
    // We assume 0 to be the root node.
    int32 node_id;
    vector<int32> children_traversal_order;
    vector<int32> children_hit_test_order;
    Data data;
};