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#pragma once
#include "cru/base/SelfResolvable.h"
#include "cru/base/log/Logger.h"
#include "cru/ui/DebugFlags.h"
#include "cru/ui/controls/Control.h"
#include "cru/ui/host/WindowHost.h"
#include <vector>
namespace cru::ui::host {
// 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 String& event_name, controls::Control* const original_sender,
events::RoutedEvent<EventArgs>* (controls::Control::*event_ptr)(),
controls::Control* const last_receiver, Args&&... args) {
constexpr auto kLogTag = "DispatchEvent";
if (original_sender == nullptr) return;
CRU_UNUSED(event_name)
if (original_sender == last_receiver) {
if constexpr (debug_flags::routed_event)
CRU_LOG_TAG_DEBUG(
"Routed event {} no need to dispatch (original_sender == "
"last_receiver). Original sender is {}.",
event_name.ToUtf8(), original_sender->GetControlType().ToUtf8());
return;
}
WindowHost::EnterEventHandling();
std::vector<ObjectResolver<controls::Control>> receive_list;
auto parent = original_sender;
while (parent != last_receiver) {
receive_list.push_back(parent->CreateResolver());
auto p = parent->GetParent();
assert(!(p == nullptr && last_receiver != nullptr));
parent = p;
}
if constexpr (debug_flags::routed_event) {
std::string log = "Dispatch routed event ";
log += event_name.ToUtf8();
log += ". Path (parent first): ";
auto i = receive_list.crbegin();
const auto end = --receive_list.crend();
for (; i != end; ++i) {
log += i->Resolve()->GetControlType().ToUtf8();
log += " -> ";
}
log += i->Resolve()->GetControlType().ToUtf8();
CRU_LOG_TAG_DEBUG(log);
}
auto handled = false;
int count = 0;
// tunnel
for (auto i = receive_list.crbegin(); i != receive_list.crend(); ++i) {
count++;
auto control = i->Resolve();
if (!control) continue;
EventArgs event_args(control, original_sender, std::forward<Args>(args)...);
static_cast<Event<EventArgs&>*>((control->*event_ptr)()->Tunnel())
->Raise(event_args);
if (event_args.IsHandled()) {
handled = true;
if constexpr (debug_flags::routed_event)
CRU_LOG_TAG_DEBUG(
"Routed event is short-circuit in TUNNEL at {}-st control (count "
"from parent).",
count);
break;
}
}
// bubble
if (!handled) {
for (const auto& resolver : receive_list) {
count--;
auto control = resolver.Resolve();
if (!control) continue;
EventArgs event_args(control, original_sender,
std::forward<Args>(args)...);
static_cast<Event<EventArgs&>*>((control->*event_ptr)()->Bubble())
->Raise(event_args);
if (event_args.IsHandled()) {
if constexpr (debug_flags::routed_event)
CRU_LOG_TAG_DEBUG(
"Routed event is short-circuit in BUBBLE at {}-st control "
"(count from parent).",
count);
break;
}
}
}
// direct
for (auto resolver : receive_list) {
auto control = resolver.Resolve();
if (!control) continue;
EventArgs event_args(control, original_sender, std::forward<Args>(args)...);
static_cast<Event<EventArgs&>*>((control->*event_ptr)()->Direct())
->Raise(event_args);
}
if constexpr (debug_flags::routed_event)
CRU_LOG_TAG_DEBUG("Routed event dispatch finished.");
WindowHost::LeaveEventHandling();
}
} // namespace cru::ui::host
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