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// Copyright (c) 2012 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 <tuple>
#include "base/macros.h"
#include "base/strings/utf_string_conversions.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "content/common/accessibility_messages.h"
#include "content/common/frame_messages.h"
#include "content/common/view_message_enums.h"
#include "content/public/common/content_switches.h"
#include "content/public/test/render_view_test.h"
#include "content/renderer/accessibility/render_accessibility_impl.h"
#include "content/renderer/render_frame_impl.h"
#include "content/renderer/render_view_impl.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/public/platform/web_size.h"
#include "third_party/blink/public/web/web_ax_object.h"
#include "third_party/blink/public/web/web_document.h"
#include "third_party/blink/public/web/web_local_frame.h"
#include "third_party/blink/public/web/web_view.h"
#include "ui/accessibility/ax_node_data.h"
using blink::WebAXObject;
using blink::WebDocument;
namespace content {
class TestRenderAccessibilityImpl : public RenderAccessibilityImpl {
public:
explicit TestRenderAccessibilityImpl(RenderFrameImpl* render_frame)
: RenderAccessibilityImpl(render_frame, ui::kAXModeComplete) {}
void SendPendingAccessibilityEvents() {
RenderAccessibilityImpl::SendPendingAccessibilityEvents();
}
};
class RenderAccessibilityImplTest : public RenderViewTest {
public:
RenderAccessibilityImplTest() {}
RenderViewImpl* view() {
return static_cast<RenderViewImpl*>(view_);
}
RenderFrameImpl* frame() {
return static_cast<RenderFrameImpl*>(view()->GetMainRenderFrame());
}
void SetUp() override {
RenderViewTest::SetUp();
sink_ = &render_thread_->sink();
}
void TearDown() override {
#if defined(LEAK_SANITIZER)
// Do this before shutting down V8 in RenderViewTest::TearDown().
// http://crbug.com/328552
__lsan_do_leak_check();
#endif
RenderViewTest::TearDown();
}
void SetMode(ui::AXMode mode) { frame()->OnSetAccessibilityMode(mode); }
void GetAllAccEvents(
std::vector<AccessibilityHostMsg_EventParams>* param_list) {
const IPC::Message* message =
sink_->GetUniqueMessageMatching(AccessibilityHostMsg_Events::ID);
ASSERT_TRUE(message);
std::tuple<std::vector<AccessibilityHostMsg_EventParams>, int, int> param;
AccessibilityHostMsg_Events::Read(message, ¶m);
*param_list = std::get<0>(param);
}
void GetLastAccEvent(
AccessibilityHostMsg_EventParams* params) {
std::vector<AccessibilityHostMsg_EventParams> param_list;
GetAllAccEvents(¶m_list);
ASSERT_GE(param_list.size(), 1U);
*params = param_list[0];
}
int CountAccessibilityNodesSentToBrowser() {
AccessibilityHostMsg_EventParams event;
GetLastAccEvent(&event);
return event.update.nodes.size();
}
protected:
IPC::TestSink* sink_;
private:
DISALLOW_COPY_AND_ASSIGN(RenderAccessibilityImplTest);
};
TEST_F(RenderAccessibilityImplTest, SendFullAccessibilityTreeOnReload) {
// The job of RenderAccessibilityImpl is to serialize the
// accessibility tree built by WebKit and send it to the browser.
// When the accessibility tree changes, it tries to send only
// the nodes that actually changed or were reparented. This test
// ensures that the messages sent are correct in cases when a page
// reloads, and that internal state is properly garbage-collected.
std::string html =
"<body>"
" <div role='group' id='A'>"
" <div role='group' id='A1'></div>"
" <div role='group' id='A2'></div>"
" </div>"
"</body>";
LoadHTML(html.c_str());
// Creating a RenderAccessibilityImpl should sent the tree to the browser.
std::unique_ptr<TestRenderAccessibilityImpl> accessibility(
new TestRenderAccessibilityImpl(frame()));
accessibility->SendPendingAccessibilityEvents();
EXPECT_EQ(4, CountAccessibilityNodesSentToBrowser());
// If we post another event but the tree doesn't change,
// we should only send 1 node to the browser.
sink_->ClearMessages();
WebDocument document = GetMainFrame()->GetDocument();
WebAXObject root_obj = WebAXObject::FromWebDocument(document);
accessibility->HandleAXEvent(root_obj, ax::mojom::Event::kLayoutComplete);
accessibility->SendPendingAccessibilityEvents();
EXPECT_EQ(1, CountAccessibilityNodesSentToBrowser());
{
// Make sure it's the root object that was updated.
AccessibilityHostMsg_EventParams event;
GetLastAccEvent(&event);
EXPECT_EQ(root_obj.AxID(), event.update.nodes[0].id);
}
// If we reload the page and send a event, we should send
// all 4 nodes to the browser. Also double-check that we didn't
// leak any of the old BrowserTreeNodes.
LoadHTML(html.c_str());
document = GetMainFrame()->GetDocument();
root_obj = WebAXObject::FromWebDocument(document);
sink_->ClearMessages();
accessibility->HandleAXEvent(root_obj, ax::mojom::Event::kLayoutComplete);
accessibility->SendPendingAccessibilityEvents();
EXPECT_EQ(4, CountAccessibilityNodesSentToBrowser());
// Even if the first event is sent on an element other than
// the root, the whole tree should be updated because we know
// the browser doesn't have the root element.
LoadHTML(html.c_str());
document = GetMainFrame()->GetDocument();
root_obj = WebAXObject::FromWebDocument(document);
sink_->ClearMessages();
const WebAXObject& first_child = root_obj.ChildAt(0);
accessibility->HandleAXEvent(first_child,
ax::mojom::Event::kLiveRegionChanged);
accessibility->SendPendingAccessibilityEvents();
EXPECT_EQ(4, CountAccessibilityNodesSentToBrowser());
}
TEST_F(RenderAccessibilityImplTest, HideAccessibilityObject) {
// Test RenderAccessibilityImpl and make sure it sends the
// proper event to the browser when an object in the tree
// is hidden, but its children are not.
std::string html =
"<body>"
" <div role='group' id='A'>"
" <div role='group' id='B'>"
" <div role='group' id='C' style='visibility:visible'>"
" </div>"
" </div>"
" </div>"
"</body>";
LoadHTML(html.c_str());
std::unique_ptr<TestRenderAccessibilityImpl> accessibility(
new TestRenderAccessibilityImpl(frame()));
accessibility->SendPendingAccessibilityEvents();
EXPECT_EQ(4, CountAccessibilityNodesSentToBrowser());
WebDocument document = GetMainFrame()->GetDocument();
WebAXObject root_obj = WebAXObject::FromWebDocument(document);
WebAXObject node_a = root_obj.ChildAt(0);
WebAXObject node_b = node_a.ChildAt(0);
WebAXObject node_c = node_b.ChildAt(0);
// Hide node 'B' ('C' stays visible).
ExecuteJavaScriptForTests(
"document.getElementById('B').style.visibility = 'hidden';");
// Force layout now.
ExecuteJavaScriptForTests("document.getElementById('B').offsetLeft;");
// Send a childrenChanged on 'A'.
sink_->ClearMessages();
accessibility->HandleAXEvent(node_a, ax::mojom::Event::kChildrenChanged);
accessibility->SendPendingAccessibilityEvents();
AccessibilityHostMsg_EventParams event;
GetLastAccEvent(&event);
ASSERT_EQ(2U, event.update.nodes.size());
// RenderAccessibilityImpl notices that 'C' is being reparented,
// so it clears the subtree rooted at 'A', then updates 'A' and then 'C'.
EXPECT_EQ(node_a.AxID(), event.update.node_id_to_clear);
EXPECT_EQ(node_a.AxID(), event.update.nodes[0].id);
EXPECT_EQ(node_c.AxID(), event.update.nodes[1].id);
EXPECT_EQ(2, CountAccessibilityNodesSentToBrowser());
}
TEST_F(RenderAccessibilityImplTest, ShowAccessibilityObject) {
// Test RenderAccessibilityImpl and make sure it sends the
// proper event to the browser when an object in the tree
// is shown, causing its own already-visible children to be
// reparented to it.
std::string html =
"<body>"
" <div role='group' id='A'>"
" <div role='group' id='B' style='visibility:hidden'>"
" <div role='group' id='C' style='visibility:visible'>"
" </div>"
" </div>"
" </div>"
"</body>";
LoadHTML(html.c_str());
std::unique_ptr<TestRenderAccessibilityImpl> accessibility(
new TestRenderAccessibilityImpl(frame()));
accessibility->SendPendingAccessibilityEvents();
EXPECT_EQ(3, CountAccessibilityNodesSentToBrowser());
// Show node 'B', then send a childrenChanged on 'A'.
ExecuteJavaScriptForTests(
"document.getElementById('B').style.visibility = 'visible';");
ExecuteJavaScriptForTests("document.getElementById('B').offsetLeft;");
sink_->ClearMessages();
WebDocument document = GetMainFrame()->GetDocument();
WebAXObject root_obj = WebAXObject::FromWebDocument(document);
WebAXObject node_a = root_obj.ChildAt(0);
WebAXObject node_b = node_a.ChildAt(0);
WebAXObject node_c = node_b.ChildAt(0);
accessibility->HandleAXEvent(node_a, ax::mojom::Event::kChildrenChanged);
accessibility->SendPendingAccessibilityEvents();
AccessibilityHostMsg_EventParams event;
GetLastAccEvent(&event);
ASSERT_EQ(3U, event.update.nodes.size());
EXPECT_EQ(node_a.AxID(), event.update.node_id_to_clear);
EXPECT_EQ(node_a.AxID(), event.update.nodes[0].id);
EXPECT_EQ(node_b.AxID(), event.update.nodes[1].id);
EXPECT_EQ(node_c.AxID(), event.update.nodes[2].id);
EXPECT_EQ(3, CountAccessibilityNodesSentToBrowser());
}
} // namespace content
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