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// Copyright (C) 2024 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
/*!
\example xr_interaction
\ingroup quick3d-examples
\ingroup qt3dxr-examples
\title Qt Quick 3D - XR 3D Interaction example
\examplecategory {3D}
\brief Demonstrates how to manipulate 3D objects with Qt Quick 3D XR.
\image xrinteraction-example.jpg
{3D scene with colorful letters and shapes floating in space}
This example shows how to create components that move and resize 3D objects in a scene.
It uses the same ray-picking strategy as the \l{Qt Quick 3D - XR Simple Input Example}{xr_input} example.
\section1 Controller input
In this example, we create a reusable component named \c AimController. This performs ray
picking to select a Model, and optionally allows the user to grab the selected Model and move
it around.
\c AimController defines signals that allows us to implement custom interactions:
\snippet xr_interaction/AimController.qml signals
\section1 Gadgets
We define an abstract component, \c XrGadget, which has two functions: \c handleControllerPress and \c handleControllerMove.
In C++, these functions would have been virtual. Since this example is implemented completely in QML,
we instead emit signals that can be handled in sub-components.
For example, \c TranslateGadget moves the controlled object along the gadget's axis based on the \c onMoved signal:
\snippet xr_interaction/TranslateGadget.qml onMoved
\section1 Tying it all together
We define a component \c GadgetBox that keeps track of which object is selected and shows a
translucent box around the selected object, in addition to showing gadgets around the object.
When a selected object is pressed, the \c GadgetBox will cycle between the three different
types of gadgets (translate, rotate, and resize).
In \c main.qml we react to the signals from the \c AimController and call the functions in \c GadgetBox:
\snippet xr_interaction/main.qml connections
We also provide haptic feedback when the hovered object or gadget changes:
\snippet xr_interaction/main.qml haptics
*/