void GraphicalModelViewDragController::CancelDrag(const QPoint& pos)
{
	// As there is no public API for cancelling a drag-and-drop operation, which needs to
	// happen as we want pick up the actual graphics object now, we need to simulate an event
	// that would cause the drag-and-drop operation to stop.
	// On Windows, this is a Escape key press and release, and needs to be a Windows event
	// as Qt lets Windows handle the drag-and-drop.
	// On Linux, it is simply sending in a mouse release event using Qt mechanisms
#if defined(Q_OS_WIN)
	// As Windows has some shortcuts involving the Escape key (e.g. Ctrl+Escape opening the start menu),
	// we'll have to fake releasing any pressed modifier keys, and pressing them again after hitting Escape
	std::vector<WORD> modifierKeys;
	modifierKeys.push_back(VK_SHIFT);
	modifierKeys.push_back(VK_CONTROL);
	modifierKeys.push_back(VK_MENU);

	INPUT releaseModifiers[3];
	INPUT pressModifiers[3];
	memset(releaseModifiers, 0, sizeof(releaseModifiers));
	memset(pressModifiers, 0, sizeof(pressModifiers));
	int modifiersPressedCount = 0;
	for (std::vector<WORD>::const_iterator it = modifierKeys.begin(); it != modifierKeys.end(); ++it) {
		if (GetAsyncKeyState(*it) < 0) {
			releaseModifiers[modifiersPressedCount].type = INPUT_KEYBOARD;
			releaseModifiers[modifiersPressedCount].ki.wScan = 0;
			releaseModifiers[modifiersPressedCount].ki.time = 0;
			releaseModifiers[modifiersPressedCount].ki.dwExtraInfo = 0;
			releaseModifiers[modifiersPressedCount].ki.wVk = (*it);
			releaseModifiers[modifiersPressedCount].ki.dwFlags = KEYEVENTF_KEYUP;

			pressModifiers[modifiersPressedCount].type = INPUT_KEYBOARD;
			pressModifiers[modifiersPressedCount].ki.wScan = 0;
			pressModifiers[modifiersPressedCount].ki.time = 0;
			pressModifiers[modifiersPressedCount].ki.dwExtraInfo = 0;
			pressModifiers[modifiersPressedCount].ki.wVk = (*it);
			pressModifiers[modifiersPressedCount].ki.dwFlags = 0;

			++modifiersPressedCount;
		}
	}

	INPUT escapeKey[2];
	memset(escapeKey, 0, sizeof(escapeKey));

	// Press the "Escape" key
	escapeKey[0].type = INPUT_KEYBOARD;
	escapeKey[0].ki.wScan = 0;
	escapeKey[0].ki.time = 0;
	escapeKey[0].ki.dwExtraInfo = 0;
	escapeKey[0].ki.wVk = VK_ESCAPE;
	escapeKey[0].ki.dwFlags = 0;

	// Release the "Escape" key
	escapeKey[1].type = INPUT_KEYBOARD;
	escapeKey[1].ki.wScan = 0;
	escapeKey[1].ki.time = 0;
	escapeKey[1].ki.dwExtraInfo = 0;
	escapeKey[1].ki.wVk = VK_ESCAPE;
	escapeKey[1].ki.dwFlags = KEYEVENTF_KEYUP;

	SendInput(modifiersPressedCount, releaseModifiers, sizeof(INPUT));
	SendInput(2, escapeKey, sizeof(INPUT));
	SendInput(modifiersPressedCount, pressModifiers, sizeof(INPUT));
#else
	QMouseEvent mouseReleaseEvent(QEvent::MouseButtonRelease, pos, Qt::LeftButton, Qt::LeftButton, Qt::NoModifier);
	QApplication::sendEvent(graphical_model_view, &mouseReleaseEvent);
#endif
}