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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 "base/strings/utf_string_conversions.h"
#include "base/time/time.h"
#include "content/common/frame_messages.h"
#include "content/common/view_message_enums.h"
#include "content/public/test/render_view_test.h"
#include "content/renderer/accessibility/renderer_accessibility.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/WebKit/public/platform/WebSize.h"
#include "third_party/WebKit/public/web/WebAXObject.h"
#include "third_party/WebKit/public/web/WebDocument.h"
#include "third_party/WebKit/public/web/WebView.h"
#include "ui/accessibility/ax_node_data.h"
using blink::WebAXObject;
using blink::WebDocument;
namespace content {
class TestRendererAccessibility : public RendererAccessibility {
public:
explicit TestRendererAccessibility(RenderFrameImpl* render_frame)
: RendererAccessibility(render_frame) {
}
void SendPendingAccessibilityEvents() {
RendererAccessibility::SendPendingAccessibilityEvents();
}
};
class RendererAccessibilityTest : public RenderViewTest {
public:
RendererAccessibilityTest() {}
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 SetMode(AccessibilityMode mode) {
frame()->OnSetAccessibilityMode(mode);
}
void GetLastAccEvent(
AccessibilityHostMsg_EventParams* params) {
const IPC::Message* message =
sink_->GetUniqueMessageMatching(AccessibilityHostMsg_Events::ID);
ASSERT_TRUE(message);
Tuple<std::vector<AccessibilityHostMsg_EventParams>, int> param;
AccessibilityHostMsg_Events::Read(message, ¶m);
ASSERT_GE(get<0>(param).size(), 1U);
*params = get<0>(param)[0];
}
int CountAccessibilityNodesSentToBrowser() {
AccessibilityHostMsg_EventParams event;
GetLastAccEvent(&event);
return event.update.nodes.size();
}
protected:
IPC::TestSink* sink_;
DISALLOW_COPY_AND_ASSIGN(RendererAccessibilityTest);
};
TEST_F(RendererAccessibilityTest, SendFullAccessibilityTreeOnReload) {
// The job of RendererAccessibility 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 RendererAccessibility should sent the tree to the browser.
scoped_ptr<TestRendererAccessibility> accessibility(
new TestRendererAccessibility(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 = view()->GetWebView()->mainFrame()->document();
WebAXObject root_obj = document.accessibilityObject();
accessibility->HandleAXEvent(
root_obj,
ui::AX_EVENT_LAYOUT_COMPLETE);
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 = view()->GetWebView()->mainFrame()->document();
root_obj = document.accessibilityObject();
sink_->ClearMessages();
accessibility->HandleAXEvent(
root_obj,
ui::AX_EVENT_LAYOUT_COMPLETE);
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 = view()->GetWebView()->mainFrame()->document();
root_obj = document.accessibilityObject();
sink_->ClearMessages();
const WebAXObject& first_child = root_obj.childAt(0);
accessibility->HandleAXEvent(
first_child,
ui::AX_EVENT_LIVE_REGION_CHANGED);
accessibility->SendPendingAccessibilityEvents();
EXPECT_EQ(4, CountAccessibilityNodesSentToBrowser());
}
// http://crbug.com/253537
#if defined(OS_ANDROID)
#define MAYBE_AccessibilityMessagesQueueWhileSwappedOut \
DISABLED_AccessibilityMessagesQueueWhileSwappedOut
#else
#define MAYBE_AccessibilityMessagesQueueWhileSwappedOut \
AccessibilityMessagesQueueWhileSwappedOut
#endif
TEST_F(RendererAccessibilityTest,
MAYBE_AccessibilityMessagesQueueWhileSwappedOut) {
std::string html =
"<body>"
" <p>Hello, world.</p>"
"</body>";
LoadHTML(html.c_str());
static const int kProxyRoutingId = 13;
// Creating a RendererAccessibility should send the tree to the browser.
scoped_ptr<TestRendererAccessibility> accessibility(
new TestRendererAccessibility(frame()));
accessibility->SendPendingAccessibilityEvents();
EXPECT_EQ(5, CountAccessibilityNodesSentToBrowser());
// Post a "value changed" event, but then swap out
// before sending it. It shouldn't send the event while
// swapped out.
sink_->ClearMessages();
WebDocument document = view()->GetWebView()->mainFrame()->document();
WebAXObject root_obj = document.accessibilityObject();
accessibility->HandleAXEvent(
root_obj,
ui::AX_EVENT_VALUE_CHANGED);
view()->GetMainRenderFrame()->OnSwapOut(kProxyRoutingId, true,
content::FrameReplicationState());
accessibility->SendPendingAccessibilityEvents();
EXPECT_FALSE(sink_->GetUniqueMessageMatching(
AccessibilityHostMsg_Events::ID));
// Navigate, so we're not swapped out anymore. Now we should
// send accessibility events again. Note that the
// message that was queued up before will be quickly discarded
// because the element it was referring to no longer exists,
// so the event here is from loading this new page.
FrameMsg_Navigate_Params nav_params;
nav_params.common_params.url = GURL("data:text/html,<p>Hello, again.</p>");
nav_params.common_params.navigation_type = FrameMsg_Navigate_Type::NORMAL;
nav_params.common_params.transition = ui::PAGE_TRANSITION_TYPED;
nav_params.current_history_list_length = 1;
nav_params.current_history_list_offset = 0;
nav_params.pending_history_list_offset = 1;
nav_params.page_id = -1;
nav_params.commit_params.browser_navigation_start =
base::TimeTicks::FromInternalValue(1);
frame()->OnNavigate(nav_params);
accessibility->SendPendingAccessibilityEvents();
EXPECT_TRUE(sink_->GetUniqueMessageMatching(
AccessibilityHostMsg_Events::ID));
}
TEST_F(RendererAccessibilityTest, HideAccessibilityObject) {
// Test RendererAccessibility 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());
scoped_ptr<TestRendererAccessibility> accessibility(
new TestRendererAccessibility(frame()));
accessibility->SendPendingAccessibilityEvents();
EXPECT_EQ(4, CountAccessibilityNodesSentToBrowser());
WebDocument document = view()->GetWebView()->mainFrame()->document();
WebAXObject root_obj = document.accessibilityObject();
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).
ExecuteJavaScript(
"document.getElementById('B').style.visibility = 'hidden';");
// Force layout now.
ExecuteJavaScript("document.getElementById('B').offsetLeft;");
// Send a childrenChanged on 'A'.
sink_->ClearMessages();
accessibility->HandleAXEvent(
node_a,
ui::AX_EVENT_CHILDREN_CHANGED);
accessibility->SendPendingAccessibilityEvents();
AccessibilityHostMsg_EventParams event;
GetLastAccEvent(&event);
ASSERT_EQ(2U, event.update.nodes.size());
// RendererAccessibility 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(RendererAccessibilityTest, ShowAccessibilityObject) {
// Test RendererAccessibility 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());
scoped_ptr<TestRendererAccessibility> accessibility(
new TestRendererAccessibility(frame()));
accessibility->SendPendingAccessibilityEvents();
EXPECT_EQ(3, CountAccessibilityNodesSentToBrowser());
// Show node 'B', then send a childrenChanged on 'A'.
ExecuteJavaScript(
"document.getElementById('B').style.visibility = 'visible';");
ExecuteJavaScript("document.getElementById('B').offsetLeft;");
sink_->ClearMessages();
WebDocument document = view()->GetWebView()->mainFrame()->document();
WebAXObject root_obj = document.accessibilityObject();
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,
ui::AX_EVENT_CHILDREN_CHANGED);
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());
}
TEST_F(RendererAccessibilityTest, DetachAccessibilityObject) {
// Test RendererAccessibility and make sure it sends the
// proper event to the browser when an object in the tree
// is detached, but its children are not. This can happen when
// a layout occurs and an anonymous render block is no longer needed.
std::string html =
"<body aria-label='Body'>"
"<span>1</span><span style='display:block'>2</span>"
"</body>";
LoadHTML(html.c_str());
scoped_ptr<TestRendererAccessibility> accessibility(
new TestRendererAccessibility(frame()));
accessibility->SendPendingAccessibilityEvents();
EXPECT_EQ(7, CountAccessibilityNodesSentToBrowser());
// Initially, the accessibility tree looks like this:
//
// Document
// +--Body
// +--Anonymous Block
// +--Static Text "1"
// +--Inline Text Box "1"
// +--Static Text "2"
// +--Inline Text Box "2"
WebDocument document = view()->GetWebView()->mainFrame()->document();
WebAXObject root_obj = document.accessibilityObject();
WebAXObject body = root_obj.childAt(0);
WebAXObject anonymous_block = body.childAt(0);
WebAXObject text_1 = anonymous_block.childAt(0);
WebAXObject text_2 = body.childAt(1);
// Change the display of the second 'span' back to inline, which causes the
// anonymous block to be destroyed.
ExecuteJavaScript(
"document.querySelectorAll('span')[1].style.display = 'inline';");
// Force layout now.
ExecuteJavaScript("document.body.offsetLeft;");
// Send a childrenChanged on the body.
sink_->ClearMessages();
accessibility->HandleAXEvent(
body,
ui::AX_EVENT_CHILDREN_CHANGED);
accessibility->SendPendingAccessibilityEvents();
// Afterwards, the accessibility tree looks like this:
//
// Document
// +--Body
// +--Static Text "1"
// +--Inline Text Box "1"
// +--Static Text "2"
// +--Inline Text Box "2"
//
// We just assert that there are now four nodes in the
// accessibility tree and that only three nodes needed
// to be updated (the body, the static text 1, and
// the static text 2).
AccessibilityHostMsg_EventParams event;
GetLastAccEvent(&event);
ASSERT_EQ(5U, event.update.nodes.size());
EXPECT_EQ(body.axID(), event.update.nodes[0].id);
EXPECT_EQ(text_1.axID(), event.update.nodes[1].id);
// The third event is to update text_2, but its id changes
// so we don't have a test expectation for it.
}
TEST_F(RendererAccessibilityTest, EventOnObjectNotInTree) {
// Test RendererAccessibility and make sure it doesn't send anything
// if we get a notification from Blink for an object that isn't in the
// tree, like the scroll area that's the parent of the main document,
// which we don't expose.
std::string html = "<body><input></body>";
LoadHTML(html.c_str());
scoped_ptr<TestRendererAccessibility> accessibility(
new TestRendererAccessibility(frame()));
accessibility->SendPendingAccessibilityEvents();
EXPECT_EQ(3, CountAccessibilityNodesSentToBrowser());
WebDocument document = view()->GetWebView()->mainFrame()->document();
WebAXObject root_obj = document.accessibilityObject();
WebAXObject scroll_area = root_obj.parentObject();
EXPECT_EQ(blink::WebAXRoleScrollArea, scroll_area.role());
// Try to fire a message on the scroll area, and assert that we just
// ignore it.
sink_->ClearMessages();
accessibility->HandleAXEvent(scroll_area,
ui::AX_EVENT_VALUE_CHANGED);
accessibility->SendPendingAccessibilityEvents();
const IPC::Message* message =
sink_->GetUniqueMessageMatching(AccessibilityHostMsg_Events::ID);
ASSERT_TRUE(message);
Tuple<std::vector<AccessibilityHostMsg_EventParams>, int> param;
AccessibilityHostMsg_Events::Read(message, ¶m);
ASSERT_EQ(0U, get<0>(param).size());
}
} // namespace content
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