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// Copyright 2017 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/base/class_property.h"
#include <algorithm>
#include <utility>
#include "base/notreached.h"
namespace ui {
PropertyHandler::PropertyHandler() = default;
PropertyHandler::PropertyHandler(PropertyHandler&& other) = default;
PropertyHandler::~PropertyHandler() {
ClearProperties();
}
void PropertyHandler::AcquireAllPropertiesFrom(PropertyHandler&& other) {
for (auto& prop_pair : other.prop_map_)
prop_map_[std::move(prop_pair.first)] = std::move(prop_pair.second);
other.prop_map_.clear();
}
int64_t PropertyHandler::SetPropertyInternal(const void* key,
const char* name,
PropertyDeallocator deallocator,
int64_t value,
int64_t default_value) {
int64_t old = GetPropertyInternal(key, default_value, false);
if (value == default_value) {
prop_map_.erase(key);
} else {
Value prop_value;
prop_value.name = name;
prop_value.value = value;
prop_value.deallocator = deallocator;
prop_map_[key] = prop_value;
}
AfterPropertyChange(key, old);
return old;
}
void PropertyHandler::ClearProperties() {
// Clear properties.
for (std::map<const void*, Value>::const_iterator iter = prop_map_.begin();
iter != prop_map_.end();
++iter) {
if (iter->second.deallocator)
(*iter->second.deallocator)(iter->second.value);
}
prop_map_.clear();
}
PropertyHandler* PropertyHandler::GetParentHandler() const {
// If you plan on using cascading properties, you must override this method
// to return the "parent" handler. If you want to use cascading properties in
// scenarios where there isn't a notion of a parent, just override this method
// and return null.
NOTREACHED();
return nullptr;
}
int64_t PropertyHandler::GetPropertyInternal(const void* key,
int64_t default_value,
bool search_parent) const {
const PropertyHandler* handler = this;
while (handler) {
auto iter = handler->prop_map_.find(key);
if (iter == handler->prop_map_.end()) {
if (!search_parent)
break;
handler = handler->GetParentHandler();
continue;
}
return iter->second.value;
}
return default_value;
}
std::set<const void*> PropertyHandler::GetAllPropertyKeys() const {
std::set<const void*> keys;
for (auto& pair : prop_map_)
keys.insert(pair.first);
return keys;
}
} // namespace ui
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