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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/accessibility/platform/ax_platform_node_delegate_utils_win.h"
#include "ui/accessibility/ax_enums.mojom.h"
#include "ui/accessibility/ax_node_data.h"
#include "ui/accessibility/ax_role_properties.h"
#include "ui/accessibility/platform/ax_platform_node.h"
#include "ui/accessibility/platform/ax_platform_node_delegate.h"
namespace ui {
bool IsValuePatternSupported(AXPlatformNodeDelegate* delegate) {
// https://docs.microsoft.com/en-us/windows/desktop/winauto/uiauto-implementingvalue
// The Value control pattern is used to support controls that have an
// intrinsic value not spanning a range and that can be represented as
// a string.
//
// IValueProvider must be implemented by controls such as the color picker
// selection control [...]
//
// We also support the Value pattern on platform documents mostly for
// historical reasons - it was supported as a way to get the URL of a document
// via IA2's get_accValue, and the UIA bridge also populates an IValueProvider
// with the same information.
// https://www.w3.org/TR/html-aam-1.0/
// The HTML AAM maps "href [a; area]" to UIA Value.Value
if (delegate->IsCellOrHeaderOfAriaGrid() &&
!delegate->HasState(ax::mojom::State::kEditable)) {
return false;
}
return delegate->GetData().IsRangeValueSupported() ||
delegate->IsReadOnlySupported() || IsLink(delegate->GetRole()) ||
delegate->GetRole() == ax::mojom::Role::kColorWell ||
delegate->IsCellOrHeaderOfAriaGrid() ||
(delegate->GetRole() == ax::mojom::Role::kButton &&
delegate->HasStringAttribute(ax::mojom::StringAttribute::kValue)) ||
(IsPlatformDocument(delegate->GetRole()) &&
delegate->GetRole() != ax::mojom::Role::kPdfRoot);
}
} // namespace ui
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