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#pragma once
#include "cru/common/Logger.hpp"
#include "cru/ui/DebugFlags.hpp"
#include "cru/ui/controls/Control.hpp"
#include <vector>
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(
const std::u16string_view& event_name,
controls::Control* const original_sender,
event::RoutedEvent<EventArgs>* (controls::Control::*event_ptr)(),
controls::Control* const last_receiver, Args&&... args) {
CRU_UNUSED(event_name)
if (original_sender == last_receiver) {
if constexpr (debug_flags::routed_event)
log::Debug(
"Routed event {} no need to dispatch (original_sender == "
"last_receiver). Original sender is {}.",
event_name, original_sender->GetControlType());
return;
}
std::vector<controls::Control*> receive_list;
auto parent = original_sender;
while (parent != last_receiver) {
receive_list.push_back(parent);
parent = parent->GetParent();
}
if constexpr (debug_flags::routed_event) {
std::u16string log = u"Dispatch routed event ";
log += event_name;
log += u". Path (parent first): ";
auto i = receive_list.crbegin();
const auto end = --receive_list.crend();
for (; i != end; ++i) {
log += (*i)->GetControlType();
log += u" -> ";
}
log += (*i)->GetControlType();
log::Debug(log);
}
auto handled = false;
int count = 0;
// tunnel
for (auto i = receive_list.crbegin(); i != receive_list.crend(); ++i) {
count++;
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;
if constexpr (debug_flags::routed_event)
log::Debug(
u"Routed event is short-circuit in TUNNEL at {}-st control (count "
u"from parent).",
count);
break;
}
}
// bubble
if (!handled) {
for (auto i : receive_list) {
count--;
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()) {
if constexpr (debug_flags::routed_event)
log::Debug(
u"Routed event is short-circuit in BUBBLE at {}-st control "
u"(count from parent).",
count);
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);
}
if constexpr (debug_flags::routed_event)
log::Debug(u"Routed event dispatch finished.");
}
} // namespace cru::ui
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