Cursor.hpp

#pragma once
// See https://github.com/LMMS/lmms/issues/5194 for the rationale.
// And https://soffes.blog/aggressively-hiding-the-cursor for the hiding
#if defined(__APPLE__)
#include <ApplicationServices/ApplicationServices.h>
#else
#include <QCursor>
#include <QGuiApplication>
#endif
 
#include <QGraphicsSceneMouseEvent>
#include <QMouseEvent>
#include <QPointF>
#include <QWidget>
 
#include <score_lib_base_export.h>
namespace score
{
inline void setCursorPos(QPointF pos) noexcept
{
#if defined(__APPLE__)
  CGPoint ppos;
  ppos.x = pos.x();
  ppos.y = pos.y();
 
  CGEventRef e
      = CGEventCreateMouseEvent(nullptr, kCGEventMouseMoved, ppos, kCGMouseButtonLeft);
  CGEventPost(kCGHIDEventTap, e);
  CFRelease(e);
#else
  QCursor::setPos(pos.toPoint());
#endif
}
inline void moveCursorPos(QPointF pos) noexcept
{
#if defined(__APPLE__)
  static int i = 0;
  i++;
  if(i % 2)
  {
    // Moving a cursor is visibly an expensive operation on macos
    // even on 3.2ghz i7 CPUs so we cull it a bit
    return;
  }
  CGPoint ppos;
  ppos.x = pos.x();
  ppos.y = pos.y();
 
  CGEventRef e
      = CGEventCreateMouseEvent(nullptr, kCGEventMouseMoved, ppos, kCGMouseButtonLeft);
  CGEventPost(kCGHIDEventTap, e);
  CFRelease(e);
#else
  QCursor::setPos(pos.toPoint());
#endif
}
 
inline QPoint globalPos(QMouseEvent* event)
{
#if defined(__APPLE__)
  CGPoint loc;
  {
    CGEventRef event = CGEventCreate(nullptr);
    loc = CGEventGetLocation(event);
    CFRelease(event);
  }
  return QPoint(loc.x, loc.y);
#else
  return event->globalPosition().toPoint();
#endif
}
 
inline QPointF globalPos(QWidget* viewport, QGraphicsSceneMouseEvent* event)
{
#if defined(__APPLE__)
  CGPoint loc;
  {
    CGEventRef event = CGEventCreate(nullptr);
    loc = CGEventGetLocation(event);
    CFRelease(event);
  }
  return QPointF(loc.x, loc.y);
#else
  return viewport->mapToGlobal(QPoint{0, 0}) + event->pos();
#endif
}
 
#if defined(__APPLE__)
SCORE_LIB_BASE_EXPORT
void hideCursor(bool hasCursor);
 
SCORE_LIB_BASE_EXPORT
void showCursor();
#else
 
inline void hideCursor(bool hasCursor)
{
#if !defined(__EMSCRIPTEN__)
  if(QGuiApplication::overrideCursor())
    QGuiApplication::changeOverrideCursor(QCursor(Qt::BlankCursor));
  else
    QGuiApplication::setOverrideCursor(QCursor(Qt::BlankCursor));
#endif
}
inline void showCursor()
{
#if !defined(__EMSCRIPTEN__)
  QGuiApplication::restoreOverrideCursor();
#endif
}
#endif
}