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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
/*!
\title QQuickWidget - QQuickView Comparison Example
\example quickwidgets/qquickwidgetversuswindow_opengl
\brief Demonstrates the benefits of QQuickWidget over a QQuickView embedded as a native window.
\examplecategory {User Interface Components}
\image qquickwidgetversuswindow-opengl-example.jpg
The example allows showing the same Qt Quick scene within the same
QWidget-based user interface using two different approaches: one is using a
QQuickView and using it as a child window and
QWidget::createWindowContainer(). The other is using QQuickWidget which
acts as a true QWidget and supports, among others, better clipping and
stacking, as is expected from a true QWidget.
The Qt Quick scene also uses direct OpenGL rendering, proving that with
QQuickWidget the rendering still happens using the accelerated 3D API. The
implication of this is that the example is tied to OpenGL and will not work
with other graphics APIs (Vulkan, Metal, Direct 3D).
Clicking on the Show Overlay checkbox demonstrates a widget stacking case
that is not rendering as expected when embedding a native window, while
QQuickWidget makes it render as expected.
Multisample antialiasing can also be exercised. When enabling it via the
corresponding checkbox, QQuickWidget will internally render into a
multisample renderbuffer, which is then resolved into a regular,
non-multisample 2D texture after each render pass, thus enabling
multisampling for the Qt Quick content without affecting the rest of the
QWidget UI. With QQuickView the native window will request multisampling
for its corresponding window surface, bringing similar results, if
supported by the platform.
The Qt Quick scene is interactive: typing into the text field is possible
regardless of which embedding technology is used. QQuickWidget takes care
of forwarding input events to the underlying Qt Quick scene automatically.
*/
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