components/ui_devtools/css_agent.cc - chromium/src - Git at Google

 // 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 "components/ui_devtools/css_agent.h"

 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "components/ui_devtools/agent_util.h"
 #include "components/ui_devtools/ui_element.h"

 namespace ui_devtools {
 namespace {

 using namespace ui_devtools::protocol;

 const char kHeight[] = "height";
 const char kWidth[] = "width";
 const char kX[] = "x";
 const char kY[] = "y";
 const char kVisibility[] = "visibility";

 std::unique_ptr<CSS::SourceRange> BuildDefaultPropertySourceRange() {
   // These tell the frontend where in the stylesheet a certain style
   // is located. Since we don't have stylesheets, this is all 0.
   // We need this because CSS fields are not editable unless
   // the range is provided.
   return CSS::SourceRange::create()
       .setStartLine(0)
       .setEndLine(0)
       .setStartColumn(0)
       .setEndColumn(0)
       .build();
 }

 std::unique_ptr<CSS::SourceRange> BuildDefaultSelectorSourceRange() {
   // This is a different source range from BuildDefaultPropertySourceRange()
   // used for the Selectors, so the frontend correctly handles property edits.
   return CSS::SourceRange::create()
       .setStartLine(1)
       .setEndLine(0)
       .setStartColumn(0)
       .setEndColumn(0)
       .build();
 }

 std::unique_ptr<protocol::Array<int>> BuildDefaultMatchingSelectors() {
   auto matching_selectors = std::make_unique<protocol::Array<int>>();

   // Add index 0 to matching delectors array, so frontend uses the class mame
   // from the selectors array as the header for the properties section
   matching_selectors->emplace_back(0);
   return matching_selectors;
 }

 std::unique_ptr<CSS::CSSProperty> BuildCSSProperty(const std::string& name,
                                                    const std::string& value) {
   return CSS::CSSProperty::create()
       .setRange(BuildDefaultPropertySourceRange())
       .setName(name)
       .setValue(value)
       .build();
 }

 std::unique_ptr<Array<CSS::CSSProperty>> BuildCSSProperties(
     const std::vector<UIElement::UIProperty>& properties_vector) {
   auto css_properties = std::make_unique<Array<protocol::CSS::CSSProperty>>();
   for (const auto& property : properties_vector) {
     css_properties->emplace_back(
         BuildCSSProperty(property.name_, property.value_));
   }
   return css_properties;
 }

 std::unique_ptr<CSS::CSSStyle> BuildCSSStyle(
     std::string stylesheet_uid,
     const std::vector<UIElement::UIProperty>& properties) {
   return protocol::CSS::CSSStyle::create()
       .setRange(BuildDefaultPropertySourceRange())
       .setCssProperties(BuildCSSProperties(properties))
       .setShorthandEntries(
           std::make_unique<Array<protocol::CSS::ShorthandEntry>>())
       .setStyleSheetId(stylesheet_uid)
       .build();
 }

 std::unique_ptr<protocol::Array<protocol::CSS::Value>> BuildSelectors(
     const std::string& name) {
   auto selectors = std::make_unique<protocol::Array<protocol::CSS::Value>>();
   selectors->emplace_back(protocol::CSS::Value::create()
                               .setText(name)
                               .setRange(BuildDefaultSelectorSourceRange())
                               .build());
   return selectors;
 }

 std::unique_ptr<protocol::CSS::SelectorList> BuildSelectorList(
     const std::string& name) {
   return protocol::CSS::SelectorList::create()
       .setSelectors(BuildSelectors(name))
       .build();
 }

 std::unique_ptr<protocol::CSS::CSSRule> BuildCSSRule(
     std::string stylesheet_uid,
     const UIElement::ClassProperties& class_properties) {
   return protocol::CSS::CSSRule::create()
       .setStyleSheetId(stylesheet_uid)
       .setSelectorList(BuildSelectorList(class_properties.class_name_))
       .setStyle(BuildCSSStyle(stylesheet_uid, class_properties.properties_))
       .build();
 }

 std::vector<UIElement::ClassProperties> GetClassPropertiesWithBounds(
     UIElement* ui_element) {
   std::vector<UIElement::ClassProperties> properties_vector =
       ui_element->GetCustomPropertiesForMatchedStyle();

   // If GetCustomPropertiesForMatchedStyle not overridden to return custom
   // properties, populate vector with bounds properties.
   if (properties_vector.empty()) {
     gfx::Rect bounds;
     ui_element->GetBounds(&bounds);
     std::vector<UIElement::UIProperty> bound_properties;
     bound_properties.emplace_back(kX, base::NumberToString(bounds.x()));
     bound_properties.emplace_back(kY, base::NumberToString(bounds.y()));
     bound_properties.emplace_back(kWidth, base::NumberToString(bounds.width()));
     bound_properties.emplace_back(kHeight,
                                   base::NumberToString(bounds.height()));
     if (ui_element->type() != VIEW) {
       bool visible;
       ui_element->GetVisible(&visible);
       bound_properties.emplace_back(kVisibility, visible ? "true" : "false");
     }
     properties_vector.emplace_back(ui_element->GetTypeName(), bound_properties);
   }

   // Set base stylesheet ID to the last index in the vector, so when bounds
   // properties are modified, CSSAgent can update and return the right
   // properties section
   ui_element->SetBaseStylesheetId(properties_vector.size() - 1);
   return properties_vector;
 }

 std::string BuildStylesheetUId(int node_id, int stylesheet_id) {
   return base::NumberToString(node_id) + "_" +
          base::NumberToString(stylesheet_id);
 }

 Response NodeNotFoundError(int node_id) {
   return Response::Error("Node with id=" + std::to_string(node_id) +
                          " not found");
 }

 Response ParseProperties(const std::string& style_text,
                          gfx::Rect* bounds,
                          bool* visible) {
   std::vector<std::string> tokens = base::SplitString(
       style_text, ":;", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);

   if (tokens.size() < 2 || tokens.size() % 2 != 0)
     return Response::Error("Need both a property name and value.");

   for (size_t i = 0; i < tokens.size() - 1; i += 2) {
     const std::string& property = tokens.at(i);
     int value;
     if (!base::StringToInt(tokens.at(i + 1), &value))
       return Response::Error("Unable to parse value for property=" + property);

     if (property == kHeight)
       bounds->set_height(std::max(0, value));
     else if (property == kWidth)
       bounds->set_width(std::max(0, value));
     else if (property == kX)
       bounds->set_x(value);
     else if (property == kY)
       bounds->set_y(value);
     else if (property == kVisibility)
       *visible = std::max(0, value) == 1;
     else
       return Response::Error("Unsupported property=" + property);
   }
   return Response::OK();
 }

 std::unique_ptr<protocol::CSS::CSSStyleSheetHeader>
 BuildObjectForStyleSheetInfo(std::string stylesheet_uid,
                              std::string url_path,
                              int line) {
   std::unique_ptr<protocol::CSS::CSSStyleSheetHeader> result =
       protocol::CSS::CSSStyleSheetHeader::create()
           .setStyleSheetId(stylesheet_uid)
           .setSourceURL(kChromiumCodeSearchSrcURL + url_path +
                         "?l=" + base::NumberToString(line))
           .setStartLine(line)
           .setStartColumn(0)
           .build();
   return result;
 }

 }  // namespace

 CSSAgent::CSSAgent(DOMAgent* dom_agent) : dom_agent_(dom_agent) {
   DCHECK(dom_agent_);
 }

 CSSAgent::~CSSAgent() {
   disable();
 }

 Response CSSAgent::enable() {
   dom_agent_->AddObserver(this);
   return Response::OK();
 }

 Response CSSAgent::disable() {
   dom_agent_->RemoveObserver(this);
   return Response::OK();
 }

 Response CSSAgent::getMatchedStylesForNode(
     int node_id,
     protocol::Maybe<protocol::Array<protocol::CSS::RuleMatch>>*
         matched_css_rules) {
   UIElement* ui_element = dom_agent_->GetElementFromNodeId(node_id);
   if (!ui_element)
     return NodeNotFoundError(node_id);
   *matched_css_rules = BuildMatchedStyles(ui_element);
   return Response::OK();
 }

 Response CSSAgent::getStyleSheetText(const protocol::String& style_sheet_id,
                                      protocol::String* result) {
   int node_id;
   int stylesheet_id;
   std::vector<std::string> ids = base::SplitString(
       style_sheet_id, "_", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
   if (ids.size() < 2 || !base::StringToInt(ids[0], &node_id) ||
       !base::StringToInt(ids[1], &stylesheet_id))
     return Response::Error("Invalid stylesheet id");

   UIElement* ui_element = dom_agent_->GetElementFromNodeId(node_id);
   if (!ui_element)
     return Response::Error("Node id not found");

   auto sources = ui_element->GetSources();
   if (static_cast<int>(sources.size()) <= stylesheet_id)
     return Response::Error("Stylesheet id not found");

   if (GetSourceCode(sources[stylesheet_id].path_, result))
     return protocol::Response::OK();
   return protocol::Response::Error("Could not read source file");
 }

 Response CSSAgent::setStyleTexts(
     std::unique_ptr<Array<CSS::StyleDeclarationEdit>> edits,
     std::unique_ptr<Array<CSS::CSSStyle>>* result) {
   auto updated_styles = std::make_unique<Array<CSS::CSSStyle>>();
   for (const auto& edit : *edits) {
     int node_id;
     int stylesheet_id;

     std::vector<std::string> ids =
         base::SplitString(edit->getStyleSheetId(), "_", base::TRIM_WHITESPACE,
                           base::SPLIT_WANT_NONEMPTY);
     if (ids.size() < 2 || !base::StringToInt(ids[0], &node_id) ||
         !base::StringToInt(ids[1], &stylesheet_id))
       return Response::Error("Invalid stylesheet id");

     UIElement* ui_element = dom_agent_->GetElementFromNodeId(node_id);

     if (!ui_element)
       return Response::Error("Node id not found");
     // Handle setting properties from metadata for View.
     if (ui_element->type() == VIEW)
       ui_element->SetPropertiesFromString(edit->getText());

     gfx::Rect updated_bounds;
     bool visible = false;
     if (!GetPropertiesForUIElement(ui_element, &updated_bounds, &visible))
       return NodeNotFoundError(node_id);

     Response response(
         ParseProperties(edit->getText(), &updated_bounds, &visible));
     if (!response.isSuccess())
       return response;

     if (!SetPropertiesForUIElement(ui_element, updated_bounds, visible))
       return NodeNotFoundError(node_id);

     updated_styles->emplace_back(BuildCSSStyle(
         edit->getStyleSheetId(), GetClassPropertiesWithBounds(ui_element)
                                      .at(stylesheet_id)
                                      .properties_));
   }
   *result = std::move(updated_styles);
   return Response::OK();
 }

 void CSSAgent::OnElementBoundsChanged(UIElement* ui_element) {
   InvalidateStyleSheet(ui_element);
 }

 void CSSAgent::InvalidateStyleSheet(UIElement* ui_element) {
   // The stylesheetId for each node is equivalent to a string of its
   // node_id + "_" + index of CSS::RuleMatch in vector.
   frontend()->styleSheetChanged(BuildStylesheetUId(
       ui_element->node_id(), ui_element->GetBaseStylesheetId()));
 }

 bool CSSAgent::GetPropertiesForUIElement(UIElement* ui_element,
                                          gfx::Rect* bounds,
                                          bool* visible) {
   if (ui_element) {
     ui_element->GetBounds(bounds);
     if (ui_element->type() != VIEW)
       ui_element->GetVisible(visible);
     return true;
   }
   return false;
 }

 bool CSSAgent::SetPropertiesForUIElement(UIElement* ui_element,
                                          const gfx::Rect& bounds,
                                          bool visible) {
   if (ui_element) {
     ui_element->SetBounds(bounds);
     ui_element->SetVisible(visible);
     return true;
   }
   return false;
 }

 std::unique_ptr<protocol::Array<protocol::CSS::RuleMatch>>
 CSSAgent::BuildMatchedStyles(UIElement* ui_element) {
   auto result = std::make_unique<protocol::Array<protocol::CSS::RuleMatch>>();
   std::vector<UIElement::ClassProperties> properties_vector =
       GetClassPropertiesWithBounds(ui_element);

   for (size_t i = 0; i < properties_vector.size(); i++) {
     result->emplace_back(
         protocol::CSS::RuleMatch::create()
             .setRule(BuildCSSRule(BuildStylesheetUId(ui_element->node_id(), i),
                                   properties_vector[i]))
             .setMatchingSelectors(BuildDefaultMatchingSelectors())
             .build());
   }
   if (!ui_element->header_sent()) {
     InitStylesheetHeaders(ui_element);
   }
   return result;
 }

 void CSSAgent::InitStylesheetHeaders(UIElement* ui_element) {
   std::vector<UIElement::Source> sources = ui_element->GetSources();
   for (size_t i = 0; i < sources.size(); i++) {
     frontend()->styleSheetAdded(BuildObjectForStyleSheetInfo(
         BuildStylesheetUId(ui_element->node_id(), i), sources[i].path_,
         sources[i].line_));
   }
   ui_element->set_header_sent();
 }

 }  // namespace ui_devtools
	// 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 "components/ui_devtools/css_agent.h"

	#include "base/strings/string_split.h"
	#include "base/strings/string_util.h"
	#include "components/ui_devtools/agent_util.h"
	#include "components/ui_devtools/ui_element.h"

	namespace ui_devtools {
	namespace {

	using namespace ui_devtools::protocol;

	const char kHeight[] = "height";
	const char kWidth[] = "width";
	const char kX[] = "x";
	const char kY[] = "y";
	const char kVisibility[] = "visibility";

	std::unique_ptr<CSS::SourceRange> BuildDefaultPropertySourceRange() {
	// These tell the frontend where in the stylesheet a certain style
	// is located. Since we don't have stylesheets, this is all 0.
	// We need this because CSS fields are not editable unless
	// the range is provided.
	return CSS::SourceRange::create()
	.setStartLine(0)
	.setEndLine(0)
	.setStartColumn(0)
	.setEndColumn(0)
	.build();
	}

	std::unique_ptr<CSS::SourceRange> BuildDefaultSelectorSourceRange() {
	// This is a different source range from BuildDefaultPropertySourceRange()
	// used for the Selectors, so the frontend correctly handles property edits.
	return CSS::SourceRange::create()
	.setStartLine(1)
	.setEndLine(0)
	.setStartColumn(0)
	.setEndColumn(0)
	.build();
	}

	std::unique_ptr<protocol::Array<int>> BuildDefaultMatchingSelectors() {
	auto matching_selectors = std::make_unique<protocol::Array<int>>();

	// Add index 0 to matching delectors array, so frontend uses the class mame
	// from the selectors array as the header for the properties section
	matching_selectors->emplace_back(0);
	return matching_selectors;
	}

	std::unique_ptr<CSS::CSSProperty> BuildCSSProperty(const std::string& name,
	const std::string& value) {
	return CSS::CSSProperty::create()
	.setRange(BuildDefaultPropertySourceRange())
	.setName(name)
	.setValue(value)
	.build();
	}

	std::unique_ptr<Array<CSS::CSSProperty>> BuildCSSProperties(
	const std::vector<UIElement::UIProperty>& properties_vector) {
	auto css_properties = std::make_unique<Array<protocol::CSS::CSSProperty>>();
	for (const auto& property : properties_vector) {
	css_properties->emplace_back(
	BuildCSSProperty(property.name_, property.value_));
	}
	return css_properties;
	}

	std::unique_ptr<CSS::CSSStyle> BuildCSSStyle(
	std::string stylesheet_uid,
	const std::vector<UIElement::UIProperty>& properties) {
	return protocol::CSS::CSSStyle::create()
	.setRange(BuildDefaultPropertySourceRange())
	.setCssProperties(BuildCSSProperties(properties))
	.setShorthandEntries(
	std::make_unique<Array<protocol::CSS::ShorthandEntry>>())
	.setStyleSheetId(stylesheet_uid)
	.build();
	}

	std::unique_ptr<protocol::Array<protocol::CSS::Value>> BuildSelectors(
	const std::string& name) {
	auto selectors = std::make_unique<protocol::Array<protocol::CSS::Value>>();
	selectors->emplace_back(protocol::CSS::Value::create()
	.setText(name)
	.setRange(BuildDefaultSelectorSourceRange())
	.build());
	return selectors;
	}

	std::unique_ptr<protocol::CSS::SelectorList> BuildSelectorList(
	const std::string& name) {
	return protocol::CSS::SelectorList::create()
	.setSelectors(BuildSelectors(name))
	.build();
	}

	std::unique_ptr<protocol::CSS::CSSRule> BuildCSSRule(
	std::string stylesheet_uid,
	const UIElement::ClassProperties& class_properties) {
	return protocol::CSS::CSSRule::create()
	.setStyleSheetId(stylesheet_uid)
	.setSelectorList(BuildSelectorList(class_properties.class_name_))
	.setStyle(BuildCSSStyle(stylesheet_uid, class_properties.properties_))
	.build();
	}

	std::vector<UIElement::ClassProperties> GetClassPropertiesWithBounds(
	UIElement* ui_element) {
	std::vector<UIElement::ClassProperties> properties_vector =
	ui_element->GetCustomPropertiesForMatchedStyle();

	// If GetCustomPropertiesForMatchedStyle not overridden to return custom
	// properties, populate vector with bounds properties.
	if (properties_vector.empty()) {
	gfx::Rect bounds;
	ui_element->GetBounds(&bounds);
	std::vector<UIElement::UIProperty> bound_properties;
	bound_properties.emplace_back(kX, base::NumberToString(bounds.x()));
	bound_properties.emplace_back(kY, base::NumberToString(bounds.y()));
	bound_properties.emplace_back(kWidth, base::NumberToString(bounds.width()));
	bound_properties.emplace_back(kHeight,
	base::NumberToString(bounds.height()));
	if (ui_element->type() != VIEW) {
	bool visible;
	ui_element->GetVisible(&visible);
	bound_properties.emplace_back(kVisibility, visible ? "true" : "false");
	}
	properties_vector.emplace_back(ui_element->GetTypeName(), bound_properties);
	}

	// Set base stylesheet ID to the last index in the vector, so when bounds
	// properties are modified, CSSAgent can update and return the right
	// properties section
	ui_element->SetBaseStylesheetId(properties_vector.size() - 1);
	return properties_vector;
	}

	std::string BuildStylesheetUId(int node_id, int stylesheet_id) {
	return base::NumberToString(node_id) + "_" +
	base::NumberToString(stylesheet_id);
	}

	Response NodeNotFoundError(int node_id) {
	return Response::Error("Node with id=" + std::to_string(node_id) +
	" not found");
	}

	Response ParseProperties(const std::string& style_text,
	gfx::Rect* bounds,
	bool* visible) {
	std::vector<std::string> tokens = base::SplitString(
	style_text, ":;", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);

	if (tokens.size() < 2 \|\| tokens.size() % 2 != 0)
	return Response::Error("Need both a property name and value.");

	for (size_t i = 0; i < tokens.size() - 1; i += 2) {
	const std::string& property = tokens.at(i);
	int value;
	if (!base::StringToInt(tokens.at(i + 1), &value))
	return Response::Error("Unable to parse value for property=" + property);

	if (property == kHeight)
	bounds->set_height(std::max(0, value));
	else if (property == kWidth)
	bounds->set_width(std::max(0, value));
	else if (property == kX)
	bounds->set_x(value);
	else if (property == kY)
	bounds->set_y(value);
	else if (property == kVisibility)
	*visible = std::max(0, value) == 1;
	else
	return Response::Error("Unsupported property=" + property);
	}
	return Response::OK();
	}

	std::unique_ptr<protocol::CSS::CSSStyleSheetHeader>
	BuildObjectForStyleSheetInfo(std::string stylesheet_uid,
	std::string url_path,
	int line) {
	std::unique_ptr<protocol::CSS::CSSStyleSheetHeader> result =
	protocol::CSS::CSSStyleSheetHeader::create()
	.setStyleSheetId(stylesheet_uid)
	.setSourceURL(kChromiumCodeSearchSrcURL + url_path +
	"?l=" + base::NumberToString(line))
	.setStartLine(line)
	.setStartColumn(0)
	.build();
	return result;
	}

	} // namespace

	CSSAgent::CSSAgent(DOMAgent* dom_agent) : dom_agent_(dom_agent) {
	DCHECK(dom_agent_);
	}

	CSSAgent::~CSSAgent() {
	disable();
	}

	Response CSSAgent::enable() {
	dom_agent_->AddObserver(this);
	return Response::OK();
	}

	Response CSSAgent::disable() {
	dom_agent_->RemoveObserver(this);
	return Response::OK();
	}

	Response CSSAgent::getMatchedStylesForNode(
	int node_id,
	protocol::Maybe<protocol::Array<protocol::CSS::RuleMatch>>*
	matched_css_rules) {
	UIElement* ui_element = dom_agent_->GetElementFromNodeId(node_id);
	if (!ui_element)
	return NodeNotFoundError(node_id);
	*matched_css_rules = BuildMatchedStyles(ui_element);
	return Response::OK();
	}

	Response CSSAgent::getStyleSheetText(const protocol::String& style_sheet_id,
	protocol::String* result) {
	int node_id;
	int stylesheet_id;
	std::vector<std::string> ids = base::SplitString(
	style_sheet_id, "_", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
	if (ids.size() < 2 \|\| !base::StringToInt(ids[0], &node_id) \|\|
	!base::StringToInt(ids[1], &stylesheet_id))
	return Response::Error("Invalid stylesheet id");

	UIElement* ui_element = dom_agent_->GetElementFromNodeId(node_id);
	if (!ui_element)
	return Response::Error("Node id not found");

	auto sources = ui_element->GetSources();
	if (static_cast<int>(sources.size()) <= stylesheet_id)
	return Response::Error("Stylesheet id not found");

	if (GetSourceCode(sources[stylesheet_id].path_, result))
	return protocol::Response::OK();
	return protocol::Response::Error("Could not read source file");
	}

	Response CSSAgent::setStyleTexts(
	std::unique_ptr<Array<CSS::StyleDeclarationEdit>> edits,
	std::unique_ptr<Array<CSS::CSSStyle>>* result) {
	auto updated_styles = std::make_unique<Array<CSS::CSSStyle>>();
	for (const auto& edit : *edits) {
	int node_id;
	int stylesheet_id;

	std::vector<std::string> ids =
	base::SplitString(edit->getStyleSheetId(), "_", base::TRIM_WHITESPACE,
	base::SPLIT_WANT_NONEMPTY);
	if (ids.size() < 2 \|\| !base::StringToInt(ids[0], &node_id) \|\|
	!base::StringToInt(ids[1], &stylesheet_id))
	return Response::Error("Invalid stylesheet id");

	UIElement* ui_element = dom_agent_->GetElementFromNodeId(node_id);

	if (!ui_element)
	return Response::Error("Node id not found");
	// Handle setting properties from metadata for View.
	if (ui_element->type() == VIEW)
	ui_element->SetPropertiesFromString(edit->getText());

	gfx::Rect updated_bounds;
	bool visible = false;
	if (!GetPropertiesForUIElement(ui_element, &updated_bounds, &visible))
	return NodeNotFoundError(node_id);

	Response response(
	ParseProperties(edit->getText(), &updated_bounds, &visible));
	if (!response.isSuccess())
	return response;

	if (!SetPropertiesForUIElement(ui_element, updated_bounds, visible))
	return NodeNotFoundError(node_id);

	updated_styles->emplace_back(BuildCSSStyle(
	edit->getStyleSheetId(), GetClassPropertiesWithBounds(ui_element)
	.at(stylesheet_id)
	.properties_));
	}
	*result = std::move(updated_styles);
	return Response::OK();
	}

	void CSSAgent::OnElementBoundsChanged(UIElement* ui_element) {
	InvalidateStyleSheet(ui_element);
	}

	void CSSAgent::InvalidateStyleSheet(UIElement* ui_element) {
	// The stylesheetId for each node is equivalent to a string of its
	// node_id + "_" + index of CSS::RuleMatch in vector.
	frontend()->styleSheetChanged(BuildStylesheetUId(
	ui_element->node_id(), ui_element->GetBaseStylesheetId()));
	}

	bool CSSAgent::GetPropertiesForUIElement(UIElement* ui_element,
	gfx::Rect* bounds,
	bool* visible) {
	if (ui_element) {
	ui_element->GetBounds(bounds);
	if (ui_element->type() != VIEW)
	ui_element->GetVisible(visible);
	return true;
	}
	return false;
	}

	bool CSSAgent::SetPropertiesForUIElement(UIElement* ui_element,
	const gfx::Rect& bounds,
	bool visible) {
	if (ui_element) {
	ui_element->SetBounds(bounds);
	ui_element->SetVisible(visible);
	return true;
	}
	return false;
	}

	std::unique_ptr<protocol::Array<protocol::CSS::RuleMatch>>
	CSSAgent::BuildMatchedStyles(UIElement* ui_element) {
	auto result = std::make_unique<protocol::Array<protocol::CSS::RuleMatch>>();
	std::vector<UIElement::ClassProperties> properties_vector =
	GetClassPropertiesWithBounds(ui_element);

	for (size_t i = 0; i < properties_vector.size(); i++) {
	result->emplace_back(
	protocol::CSS::RuleMatch::create()
	.setRule(BuildCSSRule(BuildStylesheetUId(ui_element->node_id(), i),
	properties_vector[i]))
	.setMatchingSelectors(BuildDefaultMatchingSelectors())
	.build());
	}
	if (!ui_element->header_sent()) {
	InitStylesheetHeaders(ui_element);
	}
	return result;
	}

	void CSSAgent::InitStylesheetHeaders(UIElement* ui_element) {
	std::vector<UIElement::Source> sources = ui_element->GetSources();
	for (size_t i = 0; i < sources.size(); i++) {
	frontend()->styleSheetAdded(BuildObjectForStyleSheetInfo(
	BuildStylesheetUId(ui_element->node_id(), i), sources[i].path_,
	sources[i].line_));
	}
	ui_element->set_header_sent();
	}

	} // namespace ui_devtools