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#ifndef _TechTreeWnd_h_
#define _TechTreeWnd_h_
#include <boost/signals2/signal.hpp>
#include <GG/Wnd.h>
#include "../Empire/Empire.h"
class Tech;
class EncyclopediaDetailPanel;
/** Returns a browse wnd for tech entries */
std::shared_ptr<GG::BrowseInfoWnd> TechRowBrowseWnd(const std::string& tech_name, int empire_id);
/** Contains the tech graph layout, some controls to control what is visible in
* the tech layout, the tech navigator, and the tech detail window. */
class TechTreeWnd : public GG::Wnd {
public:
using TechSignalType = boost::signals2::signal<void (std::string)>;
using TechClickSignalType = boost::signals2::signal<void (std::string, GG::Flags<GG::ModKey>)>;
using QueueAddTechsSignalType = boost::signals2::signal<void (std::vector<std::string>, int)>;
/** TechTreeWnd constructor is usually called before client has
access to techs. Attempting to show the tech tree takes a long
time and generates errors. If \p initially_hidden is true then the
tech categories are not parsed until the first time Show() is
called, speeding up the constructor and preventing spurious errors.*/
TechTreeWnd(GG::X w, GG::Y h, bool initially_hidden = true);
void CompleteConstruction() override;
double Scale() const;
bool PediaVisible();
/** If tech @p tech_name is currently visible */
bool TechIsVisible(const std::string& tech_name) const;
void SizeMove(GG::Pt ul, GG::Pt lr) override;
void Show() override;
void Update();
void Clear();
void Reset();
void ShowCategory(std::string category);
void ShowAllCategories();
void HideCategory(const std::string& category);
void HideAllCategories();
void ToggleAllCategories();
void SetTechStatus(const TechStatus status, const bool state);
void ToggleViewType(bool show_list_view);
void ShowTreeView();
void ShowListView();
void CenterOnTech(const std::string& tech_name);
void SetEncyclopediaTech(std::string tech_name);
void SelectTech(std::string tech_name);
void ShowPedia();
void HidePedia();
void TogglePedia();
mutable TechSignalType TechSelectedSignal;
mutable QueueAddTechsSignalType AddTechsToQueueSignal;
private:
class TechTreeControls;
class LayoutPanel;
class TechListBox;
void TechLeftClickedSlot(std::string tech_name, GG::Flags<GG::ModKey> modkeys);
void AddTechToResearchQueue(std::string tech_name, bool to_front);
void TechPediaDisplaySlot(std::string tech_name);
void InitializeWindows();
std::shared_ptr<TechTreeControls> m_tech_tree_controls;
std::shared_ptr<EncyclopediaDetailPanel> m_enc_detail_panel;
std::shared_ptr<LayoutPanel> m_layout_panel;
std::shared_ptr<TechListBox> m_tech_list;
/// If m_init_flag is true tech categories are not parsed until the
/// first time Show() is called. TechTreeWnd is constructed before the
/// tech categories are available to be parsed.
bool m_init_flag = true;
};
#endif
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