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Diffstat (limited to 'examples/wayland/server-side-decoration/doc/src/server-side-decoration.qdoc')
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1 files changed, 66 insertions, 27 deletions
diff --git a/examples/wayland/server-side-decoration/doc/src/server-side-decoration.qdoc b/examples/wayland/server-side-decoration/doc/src/server-side-decoration.qdoc index 7032152d1..ebbd1b145 100644 --- a/examples/wayland/server-side-decoration/doc/src/server-side-decoration.qdoc +++ b/examples/wayland/server-side-decoration/doc/src/server-side-decoration.qdoc @@ -1,36 +1,75 @@ -/**************************************************************************** -** -** Copyright (C) 2018 The Qt Company Ltd. -** Contact: https://www.qt.io/licensing/ -** -** This file is part of the documentation of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:FDL$ -** Commercial License Usage -** Licensees holding valid commercial Qt licenses may use this file in -** accordance with the commercial license agreement provided with the -** Software or, alternatively, in accordance with the terms contained in -** a written agreement between you and The Qt Company. For licensing terms -** and conditions see https://www.qt.io/terms-conditions. For further -** information use the contact form at https://www.qt.io/contact-us. -** -** GNU Free Documentation License Usage -** Alternatively, this file may be used under the terms of the GNU Free -** Documentation License version 1.3 as published by the Free Software -** Foundation and appearing in the file included in the packaging of -** this file. Please review the following information to ensure -** the GNU Free Documentation License version 1.3 requirements -** will be met: https://www.gnu.org/licenses/fdl-1.3.html. -** $QT_END_LICENSE$ -** -****************************************************************************/ +// Copyright (C) 2021 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only /*! - * \title Qt Wayland Compositor Examples - Sever Side Decoration Compositor + * \title Server Side Decoration Compositor * \example server-side-decoration + * \examplecategory {Embedded} * \brief Server Side Decoration Compositor is a simple example that demonstrates server side window decorations on xdg-shell. * \ingroup qtwaylandcompositor-examples * + * \image server-side-decoration.png + * + * \section1 Introduction + * * Server Side Decoration Compositor is a desktop-style Wayland compositor example implementing * server-side window decorations. + * + * For an introduction to the basic principles of creating a \l{Qt Wayland Compositor} with Qt, + * see the \l{Minimal QML}{Minimal QML example}. + * + * \section1 Decorations + * + * The term \e{window decorations} refers to the additional UI that accompanies most windows in the + * windowing system. Examples of this are: + * + * \list + * \li The graphical frame around the window surface, which a user can click and drag to resize + * the window. + * \li The title bar of the window, which might be used to move the window. + * \li The system tool buttons for maximizing, minimizing and closing a window. + * \endlist + * + * Traditionally in Wayland, it has been the client's task to render these decorations. At the same + * time, the position, size and state of the window is the compositor's domain. + * Some \l{Shell Extensions - Qt Wayland Compositor}{shell extensions} optionally support + * \e{server-side decorations}. This enables a compositor to communicate to clients that they should + * not draw their own window decorations. Instead, the compositor is responsible for drawing the + * window decorations. This corresponds to how decorations are handled on other windowing systems, + * such as macOS, Windows and X11. It is worth noting that certain clients may not support this at + * all. If the system is expected to run such applications, then this should also be taken into + * account. + * + * Benefits of server-side decorations: + * \list + * \li Clients do not have to reserve space for system UI in their Wayland buffers. + * \li Qt Quick and OpenGL-based clients do not have to render into a separate FBO and copy + * the content into their Wayland buffers. + * \li Client windows will have a consistent appearance, independent of which UI toolkit is in + * use. + * \li System functionality, such as resizing, closing and changing window state, is centralized + * in the server instead of being shared between the server and client. + * \endlist + * + * \section1 The Code + * + * The example compositor only supports the \l{XdgShell} extension. It initializes the extension in + * the usual way and adds surfaces to a \l ListModel in order to access them later. + * + * \snippet server-side-decoration/main.qml XdgShell + * + * In addition, the example initializes the \l XdgDecorationManagerV1 extension. This allows it + * to communicate to the client that it prefers server-side decorations. + * + * Since the interface is optional, it could be that the client does not support it and will always + * draw its own decorations. Therefore, the mode is only "preferred" and we need to check the actual + * mode of the top-level window before we decorate it. + * + * \snippet server-side-decoration/main.qml decoration + * + * For each window, we create a simple title bar above it. The title bar has a gradient, some text, + * a \l DragHandler which manages its position, and a close button. + * + * The image shows a client which supports the decoration manager extensions on the upper left-hand + * side, and the same client with client-side decorations on the lower, right-hand side. */ |