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// Copyright 2018 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.
#ifndef COMPONENTS_UI_DEVTOOLS_DOM_AGENT_H_
#define COMPONENTS_UI_DEVTOOLS_DOM_AGENT_H_
#include <memory>
#include <string>
#include <unordered_map>
#include <vector>
#include "base/observer_list.h"
#include "components/ui_devtools/DOM.h"
#include "components/ui_devtools/devtools_base_agent.h"
#include "components/ui_devtools/devtools_export.h"
#include "components/ui_devtools/ui_element_delegate.h"
namespace ui_devtools {
class UIElement;
class DOMAgentObserver {
public:
virtual void OnElementBoundsChanged(UIElement* ui_element) {}
virtual void OnElementAdded(UIElement* ui_element) {}
};
class UI_DEVTOOLS_EXPORT DOMAgent
: public UiDevToolsBaseAgent<protocol::DOM::Metainfo>,
public UIElementDelegate {
public:
DOMAgent();
~DOMAgent() override;
// DOM::Backend:
protocol::Response disable() override;
protocol::Response getDocument(
std::unique_ptr<protocol::DOM::Node>* out_root) override;
protocol::Response pushNodesByBackendIdsToFrontend(
std::unique_ptr<protocol::Array<int>> backend_node_ids,
std::unique_ptr<protocol::Array<int>>* result) override;
protocol::Response performSearch(
const protocol::String& query,
protocol::Maybe<bool> include_user_agent_shadow_dom,
protocol::String* search_id,
int* result_count) override;
protocol::Response getSearchResults(
const protocol::String& search_id,
int from_index,
int to_index,
std::unique_ptr<protocol::Array<int>>* node_ids) override;
protocol::Response discardSearchResults(
const protocol::String& search_id) override;
// UIElementDelegate:
void OnUIElementAdded(UIElement* parent, UIElement* child) override;
void OnUIElementReordered(UIElement* parent, UIElement* child) override;
void OnUIElementRemoved(UIElement* ui_element) override;
void OnUIElementBoundsChanged(UIElement* ui_element) override;
void AddObserver(DOMAgentObserver* observer);
void RemoveObserver(DOMAgentObserver* observer);
UIElement* GetElementFromNodeId(int node_id) const;
UIElement* element_root() const { return element_root_.get(); }
// Returns parent id of the element with id |node_id|. Returns 0 if parent
// does not exist.
int GetParentIdOfNodeId(int node_id) const;
protected:
std::unique_ptr<protocol::DOM::Node> BuildNode(
const std::string& name,
std::unique_ptr<std::vector<std::string>> attributes,
std::unique_ptr<protocol::Array<protocol::DOM::Node>> children,
int node_ids);
std::unique_ptr<protocol::DOM::Node> BuildDomNodeFromUIElement(
UIElement* root);
private:
struct Query;
// These are called on creating a DOM document.
std::unique_ptr<protocol::DOM::Node> BuildInitialTree();
// The caller takes ownership of the returned pointers.
virtual std::vector<UIElement*> CreateChildrenForRoot() = 0;
virtual std::unique_ptr<protocol::DOM::Node> BuildTreeForUIElement(
UIElement* ui_element) = 0;
void OnElementBoundsChanged(UIElement* ui_element);
// Recursively removes |ui_element| and its children from the frontend
// elements tree. If |update_node_id_map|=true, also remove |ui_element|'s
// |node_id| from |node_id_to_ui_element_|.
void RemoveDomNode(UIElement* ui_element, bool update_node_id_map);
void Reset();
Query PreprocessQuery(protocol::String query);
void SearchDomTree(const Query& query, std::vector<int>* result_collector);
std::unique_ptr<UIElement> element_root_;
std::unordered_map<int, UIElement*> node_id_to_ui_element_;
base::ObserverList<DOMAgentObserver>::Unchecked observers_;
using SearchResults = std::unordered_map<std::string, std::vector<int>>;
SearchResults search_results_;
bool is_document_created_ = false;
DISALLOW_COPY_AND_ASSIGN(DOMAgent);
};
} // namespace ui_devtools
#endif // COMPONENTS_UI_DEVTOOLS_DOM_AGENT_H_
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