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EventHandlers.hpp
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EventHandlers.hpp
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/*
* DISTRHO Plugin Framework (DPF)
* Copyright (C) 2012-2024 Filipe Coelho <falktx@falktx.com>
*
* Permission to use, copy, modify, and/or distribute this software for any purpose with
* or without fee is hereby granted, provided that the above copyright notice and this
* permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
* TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef DGL_EVENT_HANDLERS_HPP_INCLUDED
#define DGL_EVENT_HANDLERS_HPP_INCLUDED
#include "Widget.hpp"
START_NAMESPACE_DGL
/* NOTE none of these classes get assigned to a widget automatically
Manual plugging into Widget events is needed, like so:
```
bool onMouse(const MouseEvent& ev) override
{
return ButtonEventHandler::mouseEvent(ev);
}
```
*/
// --------------------------------------------------------------------------------------------------------------------
class ButtonEventHandler
{
public:
enum State {
kButtonStateDefault = 0x0,
kButtonStateHover = 0x1,
kButtonStateActive = 0x2,
kButtonStateActiveHover = kButtonStateActive|kButtonStateHover
};
class Callback
{
public:
virtual ~Callback() {}
virtual void buttonClicked(SubWidget* widget, int button) = 0;
};
explicit ButtonEventHandler(SubWidget* self);
virtual ~ButtonEventHandler();
bool isActive() noexcept;
void setActive(bool active, bool sendCallback) noexcept;
bool isChecked() const noexcept;
void setChecked(bool checked, bool sendCallback) noexcept;
bool isCheckable() const noexcept;
void setCheckable(bool checkable) noexcept;
Point<double> getLastClickPosition() const noexcept;
Point<double> getLastMotionPosition() const noexcept;
void setCallback(Callback* callback) noexcept;
bool mouseEvent(const Widget::MouseEvent& ev);
bool motionEvent(const Widget::MotionEvent& ev);
protected:
State getState() const noexcept;
void clearState() noexcept;
virtual void stateChanged(State state, State oldState);
void setInternalCallback(Callback* callback) noexcept;
void triggerUserCallback(SubWidget* widget, int button);
private:
struct PrivateData;
PrivateData* const pData;
DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(ButtonEventHandler)
};
// --------------------------------------------------------------------------------------------------------------------
class KnobEventHandler
{
public:
enum Orientation {
Horizontal,
Vertical,
Both
};
// NOTE hover not implemented yet
enum State {
kKnobStateDefault = 0x0,
kKnobStateHover = 0x1,
kKnobStateDragging = 0x2,
kKnobStateDraggingHover = kKnobStateDragging|kKnobStateHover
};
class Callback
{
public:
virtual ~Callback() {}
virtual void knobDragStarted(SubWidget* widget) = 0;
virtual void knobDragFinished(SubWidget* widget) = 0;
virtual void knobValueChanged(SubWidget* widget, float value) = 0;
virtual void knobDoubleClicked(SubWidget*) {};
};
explicit KnobEventHandler(SubWidget* self);
explicit KnobEventHandler(SubWidget* self, const KnobEventHandler& other);
KnobEventHandler& operator=(const KnobEventHandler& other);
virtual ~KnobEventHandler();
// if setStep(1) has been called before, this returns true
bool isInteger() const noexcept;
// returns raw value, is assumed to be scaled if using log
float getValue() const noexcept;
// NOTE: value is assumed to be scaled if using log
virtual bool setValue(float value, bool sendCallback = false) noexcept;
// returns 0-1 ranged value, already with log scale as needed
float getNormalizedValue() const noexcept;
// NOTE: value is assumed to be scaled if using log
void setDefault(float def) noexcept;
// NOTE: value is assumed to be scaled if using log
void setRange(float min, float max) noexcept;
void setStep(float step) noexcept;
void setUsingLogScale(bool yesNo) noexcept;
Orientation getOrientation() const noexcept;
void setOrientation(Orientation orientation) noexcept;
void setCallback(Callback* callback) noexcept;
// default 200, higher means slower
void setMouseDeceleration(float accel) noexcept;
bool mouseEvent(const Widget::MouseEvent& ev, double scaleFactor = 1.0);
bool motionEvent(const Widget::MotionEvent& ev, double scaleFactor = 1.0);
bool scrollEvent(const Widget::ScrollEvent& ev);
protected:
State getState() const noexcept;
private:
struct PrivateData;
PrivateData* const pData;
/* not for use */
#ifdef DISTRHO_PROPER_CPP11_SUPPORT
KnobEventHandler(KnobEventHandler& other) = delete;
KnobEventHandler(const KnobEventHandler& other) = delete;
#else
KnobEventHandler(KnobEventHandler& other);
KnobEventHandler(const KnobEventHandler& other);
#endif
DISTRHO_LEAK_DETECTOR(KnobEventHandler)
};
// --------------------------------------------------------------------------------------------------------------------
class SliderEventHandler
{
public:
explicit SliderEventHandler(SubWidget* self);
virtual ~SliderEventHandler();
private:
struct PrivateData;
PrivateData* const pData;
DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(SliderEventHandler)
};
// --------------------------------------------------------------------------------------------------------------------
END_NAMESPACE_DGL
#endif // DGL_EVENT_HANDLERS_HPP_INCLUDED