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#pragma once
#include "cru/ui/control.hpp"
namespace cru::ui {
// Dispatch the event.
//
// This will raise routed event of the control and its parent and parent's
// parent ... (until "last_receiver" if it's not nullptr) with appropriate args.
//
// First tunnel from top to bottom possibly stopped by "handled" flag in
// EventArgs. Second bubble from bottom to top possibly stopped by "handled"
// flag in EventArgs. Last direct to each control.
//
// Args is of type "EventArgs". The first init argument is "sender", which is
// automatically bound to each receiving control. The second init argument is
// "original_sender", which is unchanged. And "args" will be perfectly forwarded
// as the rest arguments.
template <typename EventArgs, typename... Args>
void DispatchEvent(Control* const original_sender,
event::RoutedEvent<EventArgs>* (Control::*event_ptr)(),
Control* const last_receiver, Args&&... args) {
std::list<Control*> receive_list;
auto parent = original_sender;
while (parent != last_receiver) {
receive_list.push_back(parent);
parent = parent->GetParent();
}
auto handled = false;
// tunnel
for (auto i = receive_list.crbegin(); i != receive_list.crend(); ++i) {
EventArgs event_args(*i, original_sender, std::forward<Args>(args)...);
static_cast<Event<EventArgs&>*>(((*i)->*event_ptr)()->Tunnel())
->Raise(event_args);
if (event_args.IsHandled()) {
handled = true;
break;
}
}
// bubble
if (!handled) {
for (auto i : receive_list) {
EventArgs event_args(i, original_sender, std::forward<Args>(args)...);
static_cast<Event<EventArgs&>*>((i->*event_ptr)()->Bubble())
->Raise(event_args);
if (event_args.IsHandled()) break;
}
}
// direct
for (auto i : receive_list) {
EventArgs event_args(i, original_sender, std::forward<Args>(args)...);
static_cast<Event<EventArgs&>*>((i->*event_ptr)()->Direct())
->Raise(event_args);
}
}
} // namespace cru::ui
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