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// Copyright 2013 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 "content/browser/accessibility/browser_accessibility_manager_android.h"
#include <cmath>
#include "base/android/jni_android.h"
#include "base/android/jni_string.h"
#include "base/strings/string_number_conversions.h"
#include "base/utf_string_conversions.h"
#include "base/values.h"
#include "content/browser/accessibility/browser_accessibility_android.h"
#include "content/common/accessibility_messages.h"
using base::android::AttachCurrentThread;
using base::android::ScopedJavaLocalRef;
namespace {
// Restricts |val| to the range [min, max].
int Clamp(int val, int min, int max) {
return std::min(std::max(val, min), max);
}
} // anonymous namespace
namespace content {
namespace aria_strings {
const char kAriaLivePolite[] = "polite";
const char kAriaLiveAssertive[] = "assertive";
}
// static
BrowserAccessibilityManager* BrowserAccessibilityManager::Create(
const AccessibilityNodeData& src,
BrowserAccessibilityDelegate* delegate,
BrowserAccessibilityFactory* factory) {
return new BrowserAccessibilityManagerAndroid(ScopedJavaLocalRef<jobject>(),
src, delegate, factory);
}
BrowserAccessibilityManagerAndroid::BrowserAccessibilityManagerAndroid(
ScopedJavaLocalRef<jobject> content_view_core,
const AccessibilityNodeData& src,
BrowserAccessibilityDelegate* delegate,
BrowserAccessibilityFactory* factory)
: BrowserAccessibilityManager(src, delegate, factory) {
if (content_view_core.is_null())
return;
// TODO(aboxhall): set up Java references
}
BrowserAccessibilityManagerAndroid::~BrowserAccessibilityManagerAndroid() {
JNIEnv* env = base::android::AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
// TODO(aboxhall): tear down Java references
}
// static
AccessibilityNodeData BrowserAccessibilityManagerAndroid::GetEmptyDocument() {
AccessibilityNodeData empty_document;
empty_document.id = 0;
empty_document.role = AccessibilityNodeData::ROLE_ROOT_WEB_AREA;
empty_document.state = 1 << AccessibilityNodeData::STATE_READONLY;
return empty_document;
}
void BrowserAccessibilityManagerAndroid::NotifyAccessibilityEvent(
int type,
BrowserAccessibility* node) {
JNIEnv* env = base::android::AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
// TODO(aboxhall): call into appropriate Java method for each type of
// notification
}
jint BrowserAccessibilityManagerAndroid::GetRootId(JNIEnv* env, jobject obj) {
return static_cast<jint>(root_->renderer_id());
}
jint BrowserAccessibilityManagerAndroid::HitTest(
JNIEnv* env, jobject obj, jint x, jint y) {
BrowserAccessibilityAndroid* result =
static_cast<BrowserAccessibilityAndroid*>(
root_->BrowserAccessibilityForPoint(gfx::Point(x, y)));
if (!result)
return root_->renderer_id();
if (result->IsFocusable())
return result->renderer_id();
// Examine the children of |result| to find the nearest accessibility focus
// candidate
BrowserAccessibility* nearest_node = FuzzyHitTest(x, y, result);
if (nearest_node)
return nearest_node->renderer_id();
return root_->renderer_id();
}
BrowserAccessibility* BrowserAccessibilityManagerAndroid::FuzzyHitTest(
int x, int y, BrowserAccessibility* start_node) {
BrowserAccessibility* nearest_node = NULL;
int min_distance = INT_MAX;
FuzzyHitTestImpl(x, y, start_node, &nearest_node, &min_distance);
return nearest_node;
}
// static
void BrowserAccessibilityManagerAndroid::FuzzyHitTestImpl(
int x, int y, BrowserAccessibility* start_node,
BrowserAccessibility** nearest_candidate, int* nearest_distance) {
BrowserAccessibilityAndroid* node =
static_cast<BrowserAccessibilityAndroid*>(start_node);
int distance = CalculateDistanceSquared(x, y, node);
if (node->IsFocusable()) {
if (distance < *nearest_distance) {
*nearest_candidate = node;
*nearest_distance = distance;
}
// Don't examine any more children of focusable node
// TODO(aboxhall): what about focusable children?
return;
}
if (!node->ComputeName().empty()) {
if (distance < *nearest_distance) {
*nearest_candidate = node;
*nearest_distance = distance;
}
return;
}
if (!node->IsLeaf()) {
for (uint32 i = 0; i < node->child_count(); i++) {
BrowserAccessibility* child = node->GetChild(i);
FuzzyHitTestImpl(x, y, child, nearest_candidate, nearest_distance);
}
}
}
// static
int BrowserAccessibilityManagerAndroid::CalculateDistanceSquared(
int x, int y, BrowserAccessibility* node) {
gfx::Rect node_bounds = node->GetLocalBoundsRect();
int nearest_x = Clamp(x, node_bounds.x(), node_bounds.right());
int nearest_y = Clamp(y, node_bounds.y(), node_bounds.bottom());
int dx = std::abs(x - nearest_x);
int dy = std::abs(y - nearest_y);
return dx * dx + dy * dy;
}
jint BrowserAccessibilityManagerAndroid::GetNativeNodeById(
JNIEnv* env, jobject obj, jint id) {
return reinterpret_cast<jint>(GetFromRendererID(id));
}
void BrowserAccessibilityManagerAndroid::NotifyRootChanged() {
// TODO(aboxhall): non-stub implementation
}
bool
BrowserAccessibilityManagerAndroid::UseRootScrollOffsetsWhenComputingBounds() {
// The Java layer handles the root scroll offset.
return false;
}
bool RegisterBrowserAccessibilityManager(JNIEnv* env) {
// TODO(aboxhall): non-stub implementation
return false;
}
} // namespace content
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