Implement Increment and Decrement accessible actions

content/browser/accessibility/accessibility_action_browsertest.cc

+// 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 "base/logging.h"
+#include "content/browser/accessibility/browser_accessibility.h"
+#include "content/browser/accessibility/browser_accessibility_manager.h"
+#include "content/browser/web_contents/web_contents_impl.h"
+#include "content/public/test/browser_test_utils.h"
+#include "content/public/test/content_browser_test.h"
+#include "content/public/test/content_browser_test_utils.h"
+#include "content/public/test/test_utils.h"
+#include "content/shell/browser/shell.h"
+#include "content/test/accessibility_browser_test_utils.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+
+namespace {
+
+class AccessibilityActionBrowserTest : public ContentBrowserTest {
+ public:
+  AccessibilityActionBrowserTest() {}
+  ~AccessibilityActionBrowserTest() override {}
+
+ protected:
+  BrowserAccessibility* FindNode(ui::AXRole role,
+                                 const std::string& name) {
+    BrowserAccessibility* root = GetManager()->GetRoot();
+    CHECK(root);
+    return FindNodeInSubtree(*root, role, name);
+  }
+
+  BrowserAccessibilityManager* GetManager() {
+    WebContentsImpl* web_contents =
+        static_cast<WebContentsImpl*>(shell()->web_contents());
+    return web_contents->GetRootBrowserAccessibilityManager();
+  }
+
+ private:
+  BrowserAccessibility* FindNodeInSubtree(
+      BrowserAccessibility& node,
+      ui::AXRole role,
+      const std::string& name) {
+    if (node.GetRole() == role &&
+        node.GetStringAttribute(ui::AX_ATTR_NAME) == name)
+      return &node;
+    for (unsigned int i = 0; i < node.PlatformChildCount(); ++i) {
+      BrowserAccessibility* result = FindNodeInSubtree(
+          *node.PlatformGetChild(i), role, name);
+      if (result)
+        return result;
+    }
+    return nullptr;
+  }
+};
+
+}  // namespace
+
+IN_PROC_BROWSER_TEST_F(AccessibilityActionBrowserTest, FocusAction) {
+  NavigateToURL(shell(), GURL(url::kAboutBlankURL));
+
+  AccessibilityNotificationWaiter waiter(shell()->web_contents(),
+                                         AccessibilityModeComplete,
+                                         ui::AX_EVENT_LOAD_COMPLETE);
+  GURL url("data:text/html,"
+           "<button>One</button>"
+           "<button>Two</button>"
+           "<button>Three</button>");
+  NavigateToURL(shell(), url);
+  waiter.WaitForNotification();
+
+  BrowserAccessibility* target = FindNode(ui::AX_ROLE_BUTTON, "One");
+  ASSERT_NE(nullptr, target);
+
+  AccessibilityNotificationWaiter waiter2(shell()->web_contents(),
+                                          AccessibilityModeComplete,
+                                          ui::AX_EVENT_FOCUS);
+  GetManager()->SetFocus(*target);
+  waiter2.WaitForNotification();
+
+  BrowserAccessibility* focus = GetManager()->GetFocus();
+  EXPECT_EQ(focus->GetId(), target->GetId());
+}
+
+IN_PROC_BROWSER_TEST_F(AccessibilityActionBrowserTest,
+                       IncrementDecrementActions) {
+  NavigateToURL(shell(), GURL(url::kAboutBlankURL));
+
+  AccessibilityNotificationWaiter waiter(shell()->web_contents(),
+                                         AccessibilityModeComplete,
+                                         ui::AX_EVENT_LOAD_COMPLETE);
+  GURL url("data:text/html,"
+           "<input type=range min=2 value=8 max=10 step=2>");
+  NavigateToURL(shell(), url);
+  waiter.WaitForNotification();
+
+  BrowserAccessibility* target = FindNode(ui::AX_ROLE_SLIDER, "");
+  ASSERT_NE(nullptr, target);
+  EXPECT_EQ(8.0, target->GetFloatAttribute(ui::AX_ATTR_VALUE_FOR_RANGE));
+
+  // Increment, should result in value changing from 8 to 10.
+  {
+    AccessibilityNotificationWaiter waiter2(shell()->web_contents(),
+                                            AccessibilityModeComplete,
+                                            ui::AX_EVENT_VALUE_CHANGED);
+    GetManager()->Increment(*target);
+    waiter2.WaitForNotification();
+  }
+  EXPECT_EQ(10.0, target->GetFloatAttribute(ui::AX_ATTR_VALUE_FOR_RANGE));
+
+  // Increment, should result in value staying the same (max).
+  {
+    AccessibilityNotificationWaiter waiter2(shell()->web_contents(),
+                                            AccessibilityModeComplete,
+                                            ui::AX_EVENT_VALUE_CHANGED);
+    GetManager()->Increment(*target);
+    waiter2.WaitForNotification();
+  }
+  EXPECT_EQ(10.0, target->GetFloatAttribute(ui::AX_ATTR_VALUE_FOR_RANGE));
+
+  // Decrement, should result in value changing from 10 to 8.
+  {
+    AccessibilityNotificationWaiter waiter2(shell()->web_contents(),
+                                            AccessibilityModeComplete,
+                                            ui::AX_EVENT_VALUE_CHANGED);
+    GetManager()->Decrement(*target);
+    waiter2.WaitForNotification();
+  }
+  EXPECT_EQ(8.0, target->GetFloatAttribute(ui::AX_ATTR_VALUE_FOR_RANGE));
+}
+
+}  // namespace content