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// *****************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************
#ifndef CONTEXT_MENU_H_18047302153418174632141234
#define CONTEXT_MENU_H_18047302153418174632141234
#include <map>
#include <vector>
#include <functional>
#include <wx/menu.h>
#include <wx/app.h>
/*
A context menu supporting C++11 lambda callbacks!
Usage:
ContextMenu menu;
menu.addItem(L"Some Label", [&]{ ...do something... }); -> capture by reference is fine, as long as captured variables have at least scope of ContextMenu::popup()!
...
menu.popup(wnd);
*/
namespace zen
{
class ContextMenu : private wxEvtHandler
{
public:
ContextMenu() {}
void addItem(const wxString& label, const std::function<void()>& command, const wxBitmap* bmp = nullptr, bool enabled = true)
{
wxMenuItem* newItem = new wxMenuItem(menu_.get(), wxID_ANY, label); //menu owns item!
if (bmp) newItem->SetBitmap(*bmp); //do not set AFTER appending item! wxWidgets screws up for yet another crappy reason
menu_->Append(newItem);
if (!enabled) newItem->Enable(false); //do not enable BEFORE appending item! wxWidgets screws up for yet another crappy reason
commandList_[newItem->GetId()] = command; //defer event connection, this may be a submenu only!
}
void addCheckBox(const wxString& label, const std::function<void()>& command, bool checked, bool enabled = true)
{
wxMenuItem* newItem = menu_->AppendCheckItem(wxID_ANY, label);
newItem->Check(checked);
if (!enabled) newItem->Enable(false);
commandList_[newItem->GetId()] = command;
}
void addRadio(const wxString& label, const std::function<void()>& command, bool selected, bool enabled = true)
{
wxMenuItem* newItem = menu_->AppendRadioItem(wxID_ANY, label);
newItem->Check(selected);
if (!enabled) newItem->Enable(false);
commandList_[newItem->GetId()] = command;
}
void addSeparator() { menu_->AppendSeparator(); }
void addSubmenu(const wxString& label, ContextMenu& submenu, const wxBitmap* bmp = nullptr) //invalidates submenu!
{
//transfer submenu commands:
commandList_.insert(submenu.commandList_.begin(), submenu.commandList_.end());
submenu.commandList_.clear();
submenu.menu_->SetNextHandler(menu_.get()); //on wxGTK submenu events are not propagated to their parent menu by default!
wxMenuItem* newItem = new wxMenuItem(menu_.get(), wxID_ANY, label, L"", wxITEM_NORMAL, submenu.menu_.release()); //menu owns item, item owns submenu!
if (bmp) newItem->SetBitmap(*bmp); //do not set AFTER appending item! wxWidgets screws up for yet another crappy reason
menu_->Append(newItem);
}
void popup(wxWindow& wnd, const wxPoint& pos = wxDefaultPosition) //show popup menu + process lambdas
{
//eventually all events from submenu items will be received by this menu
for (const auto& [itemId, command] : commandList_)
menu_->Connect(itemId, wxEVT_COMMAND_MENU_SELECTED, wxCommandEventHandler(ContextMenu::onSelection), new GenericCommand(command) /*pass ownership*/, this);
wnd.PopupMenu(menu_.get(), pos);
wxTheApp->ProcessPendingEvents(); //make sure lambdas are evaluated before going out of scope;
//although all events seem to be processed within wxWindows::PopupMenu, we shouldn't trust wxWidgets in this regard
}
private:
ContextMenu (const ContextMenu&) = delete;
ContextMenu& operator=(const ContextMenu&) = delete;
void onSelection(wxCommandEvent& event)
{
if (auto cmd = dynamic_cast<GenericCommand*>(event.m_callbackUserData))
(cmd->fun_)();
}
struct GenericCommand : public wxObject
{
GenericCommand(const std::function<void()>& fun) : fun_(fun) {}
std::function<void()> fun_;
};
std::unique_ptr<wxMenu> menu_ = std::make_unique<wxMenu>();
std::map<int, std::function<void()>> commandList_; //(item id, command)
};
}
#endif //CONTEXT_MENU_H_18047302153418174632141234
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