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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/events/event_target.h"
#include <algorithm>
#include "base/logging.h"
#include "ui/events/event.h"
namespace ui {
EventTarget::EventTarget()
: target_handler_(NULL) {
}
EventTarget::~EventTarget() {
}
void EventTarget::ConvertEventToTarget(EventTarget* target,
LocatedEvent* event) {
}
void EventTarget::AddPreTargetHandler(EventHandler* handler,
Priority priority) {
DCHECK(handler);
PrioritizedHandler prioritized = PrioritizedHandler();
prioritized.handler = handler;
prioritized.priority = priority;
EventHandlerPriorityList::iterator it;
switch (priority) {
case Priority::kDefault:
pre_target_list_.push_back(prioritized);
return;
case Priority::kSystem:
// Find the beginning of the kSystem part of the list and prepend
// this new handler to that section.
// TODO(katie): We are adding this to the front of the list because
// previously the function PrependPreTargetHandler added items to the
// front in this way. See if we can simply put each item in the list and
// sort, or insert each item the same way, in a later change.
it = std::lower_bound(pre_target_list_.begin(), pre_target_list_.end(),
prioritized);
pre_target_list_.insert(it, prioritized);
return;
case Priority::kAccessibility:
pre_target_list_.insert(pre_target_list_.begin(), prioritized);
return;
}
}
void EventTarget::RemovePreTargetHandler(EventHandler* handler) {
EventHandlerPriorityList::iterator it, end;
for (it = pre_target_list_.begin(), end = pre_target_list_.end(); it != end;
++it) {
if (it->handler == handler) {
pre_target_list_.erase(it);
return;
}
}
}
void EventTarget::AddPostTargetHandler(EventHandler* handler) {
DCHECK(handler);
post_target_list_.push_back(handler);
}
void EventTarget::RemovePostTargetHandler(EventHandler* handler) {
EventHandlerList::iterator find =
std::find(post_target_list_.begin(),
post_target_list_.end(),
handler);
if (find != post_target_list_.end())
post_target_list_.erase(find);
}
bool EventTarget::IsPreTargetListEmpty() const {
return pre_target_list_.empty();
}
EventHandler* EventTarget::SetTargetHandler(EventHandler* target_handler) {
EventHandler* original_target_handler = target_handler_;
target_handler_ = target_handler;
return original_target_handler;
}
// TODO(katie): trigger all kAccessibility handlers in the tree first,
// then kSystem and finally kDefault, rather than doing each set per
// parent level.
void EventTarget::GetPreTargetHandlers(EventHandlerList* list) {
EventTarget* target = this;
while (target) {
EventHandlerPriorityList::reverse_iterator it, rend;
for (it = target->pre_target_list_.rbegin(),
rend = target->pre_target_list_.rend();
it != rend;
++it) {
list->insert(list->begin(), it->handler);
}
target = target->GetParentTarget();
}
}
void EventTarget::GetPostTargetHandlers(EventHandlerList* list) {
EventTarget* target = this;
while (target) {
for (EventHandlerList::iterator it = target->post_target_list_.begin(),
end = target->post_target_list_.end(); it != end; ++it) {
list->push_back(*it);
}
target = target->GetParentTarget();
}
}
} // namespace ui
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