qtk/lib/input.cpp

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/*##############################################################################
## Author: Shaun Reed ##
2022-03-06 16:54:05 +00:00
## Legal: All Content (c) 2022 Shaun Reed, all rights reserved ##
2021-09-03 16:56:57 +00:00
## About: Input class from tutorials followed at trentreed.net ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com | GitHub: shaunrd0 ##
##############################################################################*/
#include <algorithm>
#include <vector>
#include <QCursor>
#include <input.h>
/*******************************************************************************
* Static Helper Structs
******************************************************************************/
template <typename T>
struct InputInstance : std::pair<T, Input::InputState>
{
typedef std::pair<T, Input::InputState> base_class;
inline InputInstance(T value)
: base_class(value, Input::InputInvalid) {}
inline InputInstance(T value, Input::InputState state)
: base_class(value, state) {}
inline bool operator==(const InputInstance & rhs) const
{ return this->first == rhs.first;}
};
// Key, button instance typedefs
typedef InputInstance<Qt::Key> KeyInstance;
typedef InputInstance<Qt::MouseButton> ButtonInstance;
// Key, button instance container typedefs
typedef std::vector<KeyInstance> KeyContainer;
typedef std::vector<ButtonInstance> ButtonContainer;
// Static containers for key, button instances
static KeyContainer sg_keyInstances;
static ButtonContainer sg_buttonInstances;
// Static containers for mouse data
static QPoint sg_mouseCurrPosition;
static QPoint sg_mousePrevPosition;
static QPoint sg_mouseDelta;
/*******************************************************************************
* Static Inline Helper Functions
******************************************************************************/
static inline KeyContainer::iterator FindKey(Qt::Key value)
{
return std::find(sg_keyInstances.begin(), sg_keyInstances.end(), value);
}
static inline ButtonContainer::iterator FindButton(Qt::MouseButton value)
{
return std::find(sg_buttonInstances.begin(), sg_buttonInstances.end(), value);
}
template <typename TPair>
static inline void UpdateStates(TPair & instance)
{
switch (instance.second)
{
case Input::InputRegistered:
instance.second = Input::InputTriggered;
break;
case Input::InputTriggered:
instance.second = Input::InputPressed;
break;
case Input::InputUnregistered:
instance.second = Input::InputReleased;
break;
default:
break;
}
}
template <typename TPair>
static inline bool CheckReleased(const TPair & instance)
{
return instance.second == Input::InputReleased;
}
template <typename Container>
static inline void Update(Container & container)
{
typedef typename Container::iterator Iter;
typedef typename Container::value_type TPair;
// Remove old data
Iter remove =
std::remove_if(container.begin(), container.end(), &CheckReleased<TPair>);
container.erase(remove, container.end());
// Update existing data
std::for_each(container.begin(), container.end(), &UpdateStates<TPair>);
}
/*******************************************************************************
* Input Implementation
******************************************************************************/
Input::InputState Input::keyState(Qt::Key k)
{
KeyContainer::iterator it = FindKey(k);
return (it != sg_keyInstances.end()) ? it->second : InputInvalid;
}
Input::InputState Input::buttonState(Qt::MouseButton k)
{
ButtonContainer::iterator it = FindButton(k);
return (it != sg_buttonInstances.end()) ? it->second : InputInvalid;
}
QPoint Input::mousePosition()
{
return QCursor::pos();
}
QPoint Input::mouseDelta()
{
return sg_mouseDelta;
}
void Input::update()
{
// Update Mouse Delta
sg_mousePrevPosition = sg_mouseCurrPosition;
sg_mouseCurrPosition = QCursor::pos();
sg_mouseDelta = sg_mouseCurrPosition - sg_mousePrevPosition;
// Update KeyState values
Update(sg_buttonInstances);
Update(sg_keyInstances);
}
void Input::registerKeyPress(int k)
{
KeyContainer::iterator it = FindKey((Qt::Key)k);
if (it == sg_keyInstances.end())
{
sg_keyInstances.push_back(KeyInstance((Qt::Key)k, InputRegistered));
}
}
void Input::registerKeyRelease(int k)
{
KeyContainer::iterator it = FindKey((Qt::Key)k);
if (it != sg_keyInstances.end())
{
it->second = InputUnregistered;
}
}
void Input::registerMousePress(Qt::MouseButton btn)
{
ButtonContainer::iterator it = FindButton(btn);
if (it == sg_buttonInstances.end())
{
sg_buttonInstances.push_back(ButtonInstance(btn, InputRegistered));
}
}
void Input::registerMouseRelease(Qt::MouseButton btn)
{
ButtonContainer::iterator it = FindButton(btn);
if (it != sg_buttonInstances.end())
{
it->second = InputUnregistered;
}
}
void Input::reset()
{
sg_keyInstances.clear();
sg_buttonInstances.clear();
}