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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup GHOST
* Declaration of GHOST DirectManipulation classes.
*/
#pragma once
#ifndef WIN32
# error WIN32 only!
#endif // WIN32
#include "GHOST_Types.h"
#include <directmanipulation.h>
#include <wrl.h>
#define PINCH_SCALE_FACTOR 125.0f
typedef struct {
int32_t x, y, scale;
bool isScrollDirectionInverted;
} GHOST_TTrackpadInfo;
class GHOST_DirectManipulationHelper;
class GHOST_DirectManipulationViewportEventHandler
: public Microsoft::WRL::RuntimeClass<
Microsoft::WRL::RuntimeClassFlags<Microsoft::WRL::RuntimeClassType::ClassicCom>,
Microsoft::WRL::Implements<
Microsoft::WRL::RuntimeClassFlags<Microsoft::WRL::RuntimeClassType::ClassicCom>,
Microsoft::WRL::FtmBase,
IDirectManipulationViewportEventHandler>> {
public:
GHOST_DirectManipulationViewportEventHandler(uint16_t dpi);
/*
* Resets viewport and tracked touchpad state.
*/
void resetViewport(IDirectManipulationViewport *viewport);
/* DirectManipulation callbacks. */
HRESULT STDMETHODCALLTYPE OnViewportStatusChanged(IDirectManipulationViewport *viewport,
DIRECTMANIPULATION_STATUS current,
DIRECTMANIPULATION_STATUS previous) override;
HRESULT STDMETHODCALLTYPE OnViewportUpdated(IDirectManipulationViewport *viewport) override;
HRESULT STDMETHODCALLTYPE OnContentUpdated(IDirectManipulationViewport *viewport,
IDirectManipulationContent *content) override;
private:
enum { GESTURE_NONE, GESTURE_PAN, GESTURE_PINCH } gesture_state;
int32_t last_x, last_y, last_scale;
GHOST_TTrackpadInfo accumulated_values;
uint16_t dpi;
DIRECTMANIPULATION_STATUS dm_status;
friend class GHOST_DirectManipulationHelper;
};
class GHOST_DirectManipulationHelper {
public:
/*
* Creates a GHOST_DirectManipulationHelper for the provided window.
* \param hWnd: The window receiving DirectManipulation events.
* \param dpi: The current DPI.
* \return Pointer to the new GHOST_DirectManipulationHelper if created, nullptr if there was an
* error.
*/
static GHOST_DirectManipulationHelper *create(HWND hWnd, uint16_t dpi);
~GHOST_DirectManipulationHelper();
/*
* Drives the DirectManipulation context.
* DirectManipulation's intended use is to tie user input into DirectComposition's compositor
* scaling and translating. We are not using DirectComposition and therefore must drive
* DirectManipulation manually.
*/
void update();
/*
* Sets pointer in contact with the DirectManipulation context.
* \param pointerId: ID of the pointer in contact.
*/
void onPointerHitTest(UINT32 pointerId);
/*
* Updates DPI information for touchpad scaling.
* \param dpi: The new DPI.
*/
void setDPI(uint16_t dpi);
/*
* Retrieves trackpad input.
* \return The accumulated trackpad translation and scale since last call.
*/
GHOST_TTrackpadInfo getTrackpadInfo();
private:
GHOST_DirectManipulationHelper(
HWND hWnd,
Microsoft::WRL::ComPtr<IDirectManipulationManager> directManipulationManager,
Microsoft::WRL::ComPtr<IDirectManipulationUpdateManager> directManipulationUpdateManager,
Microsoft::WRL::ComPtr<IDirectManipulationViewport> directManipulationViewport,
Microsoft::WRL::ComPtr<GHOST_DirectManipulationViewportEventHandler>
directManipulationEventHandler,
DWORD directManipulationViewportHandlerCookie,
bool isScrollDirectionInverted);
/*
* Retrieves the scroll direction from the registry.
* \return True if scroll direction is inverted.
*/
static bool getScrollDirectionFromReg();
/*
* Registers listener for registry scroll direction entry changes.
*/
void registerScrollDirectionChangeListener();
HWND m_hWnd;
HKEY m_scrollDirectionRegKey;
HANDLE m_scrollDirectionChangeEvent;
Microsoft::WRL::ComPtr<IDirectManipulationManager> m_directManipulationManager;
Microsoft::WRL::ComPtr<IDirectManipulationUpdateManager> m_directManipulationUpdateManager;
Microsoft::WRL::ComPtr<IDirectManipulationViewport> m_directManipulationViewport;
Microsoft::WRL::ComPtr<GHOST_DirectManipulationViewportEventHandler>
m_directManipulationEventHandler;
DWORD m_directManipulationViewportHandlerCookie;
bool m_isScrollDirectionInverted;
};
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