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// **************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl.html *
// * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved *
// **************************************************************************
#ifndef CONTEXT_HEADER_18047302153418174632141234
#define CONTEXT_HEADER_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() : menu(new wxMenu) {}
void addItem(const wxString& label, const std::function<void()>& command, const wxBitmap* bmp = nullptr, bool enabled = true, int id = wxID_ANY)
{
wxMenuItem* newItem = new wxMenuItem(menu.get(), id, 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 checked, bool enabled = true)
{
wxMenuItem* newItem = menu->AppendRadioItem(wxID_ANY, label);
newItem->Check(checked);
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) //show popup menu + process lambdas
{
//eventually all events from submenu items will be received by this menu
for (auto iter = commandList.begin(); iter != commandList.end(); ++iter)
menu->Connect(iter->first, wxEVT_COMMAND_MENU_SELECTED, wxCommandEventHandler(ContextMenu::onSelection), new GenericCommand(iter->second) /*pass ownership*/, this);
wnd.PopupMenu(menu.get());
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:
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::map<int, std::function<void()>> commandList; //(item id, command)
};
}
#endif //CONTEXT_HEADER_18047302153418174632141234
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