Mac a11y: Add RoleDescription and Value attributes to accessibility information.

ui/views/widget/native_widget_mac_accessibility_unittest.mm

+// Copyright 2016 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.
+
+#include <memory>
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/strings/sys_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
+#import "testing/gtest_mac.h"
+#include "ui/accessibility/ax_enums.h"
+#include "ui/accessibility/ax_view_state.h"
+#import "ui/accessibility/platform/ax_platform_node_mac.h"
+#include "ui/base/ime/text_input_type.h"
+#import "ui/gfx/mac/coordinate_conversion.h"
+#include "ui/views/controls/textfield/textfield.h"
+#include "ui/views/test/widget_test.h"
+#include "ui/views/widget/widget.h"
+
+// Expose some methods from AXPlatformNodeCocoa for testing purposes only.
+@interface AXPlatformNodeCocoa (Testing)
+- (NSString*)AXRole;
+@end
+
+namespace views {
+
+namespace {
+
+NSString* const kTestStringValue = @"Test string value";
+NSString* const kTestTitle = @"Test textfield";
+
+class FlexibleRoleTestView : public View {
+ public:
+  explicit FlexibleRoleTestView(ui::AXRole role) : role_(role) {}
+  void set_role(ui::AXRole role) { role_ = role; }
+
+  // Add a child view and resize to fit the child.
+  void FitBoundsToNewChild(View* view) {
+    View::AddChildView(view);
+    // Fit the parent widget to the size of the child for accurate hit tests.
+    SetBoundsRect(view->bounds());
+  }
+
+  // View:
+  void GetAccessibleState(ui::AXViewState* state) override {
+    View::GetAccessibleState(state);
+    state->role = role_;
+  }
+
+ private:
+  ui::AXRole role_;
+
+  DISALLOW_COPY_AND_ASSIGN(FlexibleRoleTestView);
+};
+
+class NativeWidgetMacAccessibilityTest : public test::WidgetTest {
+ public:
+  NativeWidgetMacAccessibilityTest() {}
+
+  void SetUp() override {
+    test::WidgetTest::SetUp();
+    widget_ = CreateTopLevelPlatformWidget();
+    widget_->SetBounds(gfx::Rect(50, 50, 100, 100));
+    widget()->Show();
+  }
+
+  void TearDown() override {
+    widget_->CloseNow();
+    test::WidgetTest::TearDown();
+  }
+
+  id AttributeValueAtMidpoint(NSString* attribute) {
+    // Accessibility hit tests come in Cocoa screen coordinates.
+    NSPoint midpoint_in_screen_ = gfx::ScreenPointToNSPoint(
+        widget_->GetWindowBoundsInScreen().CenterPoint());
+    id hit =
+        [widget_->GetNativeWindow() accessibilityHitTest:midpoint_in_screen_];
+    id value = [hit accessibilityAttributeValue:attribute];
+    return value;
+  }
+
+  Textfield* AddChildTextfield(const gfx::Size& size) {
+    Textfield* textfield = new Textfield;
+    textfield->SetText(base::SysNSStringToUTF16(kTestStringValue));
+    textfield->SetAccessibleName(base::SysNSStringToUTF16(kTestTitle));
+    textfield->SetSize(size);
+    widget()->GetContentsView()->AddChildView(textfield);
+    return textfield;
+  }
+
+  Widget* widget() { return widget_; }
+  gfx::Rect GetWidgetBounds() { return widget_->GetClientAreaBoundsInScreen(); }
+
+ private:
+  Widget* widget_ = nullptr;
+
+  DISALLOW_COPY_AND_ASSIGN(NativeWidgetMacAccessibilityTest);
+};
+
+}  // namespace
+
+// Test for NSAccessibilityChildrenAttribute, and ensure it excludes ignored
+// children from the accessibility tree.
+TEST_F(NativeWidgetMacAccessibilityTest, ChildrenAttribute) {
+  // Check childless views don't have accessibility children.
+  EXPECT_EQ(0u,
+            [AttributeValueAtMidpoint(NSAccessibilityChildrenAttribute) count]);
+
+  const size_t kNumChildren = 3;
+  for (size_t i = 0; i < kNumChildren; ++i) {
+    // Make sure the labels won't interfere with the hit test.
+    AddChildTextfield(gfx::Size());
+  }
+
+  EXPECT_EQ(kNumChildren,
+            [AttributeValueAtMidpoint(NSAccessibilityChildrenAttribute) count]);
+
+  // Check ignored children don't show up in the accessibility tree.
+  widget()->GetContentsView()->AddChildView(
+      new FlexibleRoleTestView(ui::AX_ROLE_IGNORED));
+  EXPECT_EQ(kNumChildren,
+            [AttributeValueAtMidpoint(NSAccessibilityChildrenAttribute) count]);
+}
+
+// Test for NSAccessibilityParentAttribute, including for a Widget with no
+// parent.
+TEST_F(NativeWidgetMacAccessibilityTest, ParentAttribute) {
+  Textfield* child = AddChildTextfield(widget()->GetContentsView()->size());
+
+  // Views with Widget parents will have a NSWindow parent.
+  EXPECT_NSEQ(
+      NSAccessibilityWindowRole,
+      [AttributeValueAtMidpoint(NSAccessibilityParentAttribute) AXRole]);
+
+  // Views with non-Widget parents will have the role of the parent view.
+  widget()->GetContentsView()->RemoveChildView(child);
+  FlexibleRoleTestView* parent = new FlexibleRoleTestView(ui::AX_ROLE_GROUP);
+  parent->FitBoundsToNewChild(child);
+  widget()->GetContentsView()->AddChildView(parent);
+  EXPECT_NSEQ(
+      NSAccessibilityGroupRole,
+      [AttributeValueAtMidpoint(NSAccessibilityParentAttribute) AXRole]);
+
+  // Test an ignored role parent is skipped in favor of the grandparent.
+  parent->set_role(ui::AX_ROLE_IGNORED);
+  EXPECT_NSEQ(
+      NSAccessibilityWindowRole,
+      [AttributeValueAtMidpoint(NSAccessibilityParentAttribute) AXRole]);
+}
+
+// Test for NSAccessibilityPositionAttribute, including on Widget movement
+// updates.
+TEST_F(NativeWidgetMacAccessibilityTest, PositionAttribute) {
+  NSValue* widget_origin =
+      [NSValue valueWithPoint:gfx::ScreenPointToNSPoint(
+                                  GetWidgetBounds().bottom_left())];
+  EXPECT_NSEQ(widget_origin,
+              AttributeValueAtMidpoint(NSAccessibilityPositionAttribute));
+
+  // Check the attribute is updated when the Widget is moved.
+  gfx::Rect new_bounds(60, 80, 100, 100);
+  widget()->SetBounds(new_bounds);
+  widget_origin = [NSValue
+      valueWithPoint:gfx::ScreenPointToNSPoint(new_bounds.bottom_left())];
+  EXPECT_NSEQ(widget_origin,
+              AttributeValueAtMidpoint(NSAccessibilityPositionAttribute));
+}
+
+// Tests for accessibility attributes on a views::Textfield.
+// TODO(patricialor): Test against Cocoa-provided attributes as well to ensure
+// consistency between Cocoa and toolkit-views.
+TEST_F(NativeWidgetMacAccessibilityTest, TextfieldAccessibility) {
+  Textfield* textfield = AddChildTextfield(GetWidgetBounds().size());
+
+  // NSAccessibilityTitleAttribute.
+  EXPECT_NSEQ(kTestTitle,
+              AttributeValueAtMidpoint(NSAccessibilityTitleAttribute));
+
+  // NSAccessibilityValueAttribute.
+  EXPECT_NSEQ(kTestStringValue,
+              AttributeValueAtMidpoint(NSAccessibilityValueAttribute));
+
+  // NSAccessibilityRoleAttribute.
+  EXPECT_NSEQ(NSAccessibilityTextFieldRole,
+              AttributeValueAtMidpoint(NSAccessibilityRoleAttribute));
+
+  // NSAccessibilitySubroleAttribute and
+  // NSAccessibilityRoleDescriptionAttribute.
+  EXPECT_NSEQ(nil, AttributeValueAtMidpoint(NSAccessibilitySubroleAttribute));
+  NSString* role_description =
+      NSAccessibilityRoleDescription(NSAccessibilityTextFieldRole, nil);
+  EXPECT_NSEQ(role_description, AttributeValueAtMidpoint(
+                                    NSAccessibilityRoleDescriptionAttribute));
+
+  // Test accessibility clients can see subroles as well.
+  textfield->SetTextInputType(ui::TEXT_INPUT_TYPE_PASSWORD);
+  EXPECT_NSEQ(NSAccessibilitySecureTextFieldSubrole,
+              AttributeValueAtMidpoint(NSAccessibilitySubroleAttribute));
+  role_description = NSAccessibilityRoleDescription(
+      NSAccessibilityTextFieldRole, NSAccessibilitySecureTextFieldSubrole);
+  EXPECT_NSEQ(role_description, AttributeValueAtMidpoint(
+                                    NSAccessibilityRoleDescriptionAttribute));
+
+  // Prevent the textfield from interfering with hit tests on the widget itself.
+  widget()->GetContentsView()->RemoveChildView(textfield);
+
+  // NSAccessibilitySizeAttribute.
+  EXPECT_EQ(GetWidgetBounds().size(),
+            gfx::Size([AttributeValueAtMidpoint(NSAccessibilitySizeAttribute)
+                sizeValue]));
+  // Check the attribute is updated when the Widget is resized.
+  gfx::Size new_size(200, 40);
+  widget()->SetSize(new_size);
+  EXPECT_EQ(new_size, gfx::Size([AttributeValueAtMidpoint(
+                          NSAccessibilitySizeAttribute) sizeValue]));
+}
+
+}  // namespace views