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#ifndef ANDROID_DVR_VIRTUAL_TOUCHPAD_INTERFACE_H
#define ANDROID_DVR_VIRTUAL_TOUCHPAD_INTERFACE_H
#include "dvr/virtual_touchpad_client.h"
#include <memory>
#include <utils/Errors.h>
#include <utils/String8.h>
namespace android {
namespace dvr {
// Provides a virtual touchpad for injecting events into the input system.
//
class VirtualTouchpad {
public:
enum : int {
PRIMARY = DVR_VIRTUAL_TOUCHPAD_PRIMARY,
VIRTUAL = DVR_VIRTUAL_TOUCHPAD_VIRTUAL,
};
virtual ~VirtualTouchpad() {}
// Create a virtual touchpad.
// Implementations should provide this, and hide their constructors.
// For the user, switching implementations should be as simple as changing
// the class whose |Create()| is called.
// Implementations should be minimial; major resource allocation should
// be performed in Attach().
static std::unique_ptr<VirtualTouchpad> Create() {
return nullptr;
}
// Initialize a virtual touchpad.
virtual status_t Attach() = 0;
// Shut down a virtual touchpad.
virtual status_t Detach() = 0;
// Generate a simulated touch event.
//
// @param touchpad Touchpad selector index.
// @param x Horizontal touch position.
// @param y Vertical touch position.
// Values must be in the range [0.0, 1.0).
// @param pressure Touch pressure.
// Positive values represent contact; use 1.0f if contact
// is binary. Use 0.0f for no contact.
// @returns OK on success.
//
virtual status_t Touch(int touchpad, float x, float y, float pressure) = 0;
// Generate a simulated touchpad button state.
//
// @param touchpad Touchpad selector index.
// @param buttons A union of MotionEvent BUTTON_* values.
// @returns OK on success.
//
// Currently only BUTTON_BACK is supported, as the implementation
// restricts itself to operations actually required by VrWindowManager.
//
virtual status_t ButtonState(int touchpad, int buttons) = 0;
// Generate a simulated scroll event.
//
// @param touchpad Touchpad selector index.
// @param x Horizontal scroll increment.
// @param y Vertical scroll increment.
// Values must be in the range [-1.0, 1.0].
// @returns OK on success.
//
virtual status_t Scroll(int touchpad, float x, float y) = 0;
// Report state for 'dumpsys'.
virtual void dumpInternal(String8& result) = 0;
protected:
VirtualTouchpad() {}
private:
VirtualTouchpad(const VirtualTouchpad&) = delete;
void operator=(const VirtualTouchpad&) = delete;
};
} // namespace dvr
} // namespace android
#endif // ANDROID_DVR_VIRTUAL_TOUCHPAD_INTERFACE_H
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