mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-26 01:20:25 +00:00
87 lines
2.4 KiB
C++
87 lines
2.4 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Optional.h>
|
|
#include <AK/String.h>
|
|
#include <AK/Vector.h>
|
|
|
|
template<typename T>
|
|
class History final {
|
|
public:
|
|
void push(const T& item);
|
|
T current() const;
|
|
|
|
void go_back();
|
|
void go_forward();
|
|
|
|
bool can_go_back() { return m_current > 0; }
|
|
bool can_go_forward() { return m_current + 1 < static_cast<int>(m_items.size()); }
|
|
|
|
void clear();
|
|
|
|
private:
|
|
Vector<T> m_items;
|
|
int m_current { -1 };
|
|
};
|
|
|
|
template<typename T>
|
|
inline void History<T>::push(const T& item)
|
|
{
|
|
m_items.shrink(m_current + 1);
|
|
m_items.append(item);
|
|
m_current++;
|
|
}
|
|
|
|
template<typename T>
|
|
inline T History<T>::current() const
|
|
{
|
|
if (m_current == -1)
|
|
return {};
|
|
return m_items[m_current];
|
|
}
|
|
|
|
template<typename T>
|
|
inline void History<T>::go_back()
|
|
{
|
|
ASSERT(can_go_back());
|
|
m_current--;
|
|
}
|
|
|
|
template<typename T>
|
|
inline void History<T>::go_forward()
|
|
{
|
|
ASSERT(can_go_forward());
|
|
m_current++;
|
|
}
|
|
|
|
template<typename T>
|
|
inline void History<T>::clear()
|
|
{
|
|
m_items = {};
|
|
m_current = -1;
|
|
}
|