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authorVenugopal Shivashankar <venugopal.shivashankar@digia.com>2016-02-25 15:02:46 +0100
committerVenugopal Shivashankar <venugopal.shivashankar@digia.com>2016-02-26 12:07:15 +0000
commit384b6f76242d1872feb1c7483f0526ecc9dd3c2e (patch)
tree3c4abb28d8ff067babed3c3facb168c914acf90a /examples/quick/painteditem
parente01bed44bca9bd0919f70dfc14f8297415d61bd9 (diff)
Doc: Move documentation for painteditem example
Makes no sense to maintain the documentation in a separate directory outside the example source tree. Task-number: QTBUG-50405 Change-Id: I660ea712603aed5e7cbbd7b060ca064480de4e11 Reviewed-by: Martin Smith <martin.smith@theqtcompany.com> Reviewed-by: Topi Reiniƶ <topi.reinio@theqtcompany.com>
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-/****************************************************************************
-**
-** Copyright (C) 2015 The Qt Company Ltd.
-** Contact: http://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 http://www.qt.io/terms-conditions. For further
-** information use the contact form at http://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: http://www.gnu.org/copyleft/fdl.html.
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-
-/*!
- \title Scene Graph - Painted Item
- \brief Shows how to implement QPainter-based custom scenegraph items.
- \example customitems/painteditem
- \ingroup qtquickexamples
-
- The Painted Item example shows how to use the QML Scene Graph framework to
- implement custom scenegraph items using QPainter.
-
- \image declarative-textballoons_example.png
-
- The QQuickPaintedItem class is a class derived from QQuickItem for implementing
- custom QML Scene Graph items using the QPainter interfaces.
-
- The example consists of an item class, a plugin class and a QML file
- to use this plugin. The \c TextBalloon class represents the individual
- text balloons extending QQuickPaintedItem, the \c TextBalloonPlugin class
- represents the skeleton code for a \l {Qt Quick} plugin and the
- \c textballoons.qml file is used to load the plugin and display the text
- balloons.
-
- We will focus on the \c TextBalloon class first and continue with the
- \c textballoons.qml file. For an example on how to implement a \l {Qt Quick}
- plugin please look at \l{Chapter 6: Writing an Extension Plugin}
- {Writing an Extension Plugin}
-
- \section1 TextBalloon Class Declaration
-
- The \c TextBalloon class inherits from QQuickPaintedItem. QQuickPaintedItem
- is the base class for all QPainter based items in the QML Scene Graph
- framework.
-
- \snippet customitems/painteditem/textballoon.h 0
-
- To implement a QQuickPaintedItem you must implement QQuickPaintedIem's pure
- virtual function \l {QQuickPaintedItem::}{paint()} which implements the
- painting of the type.
-
- \section1 TextBalloon Class Definition
-
- We have to be sure to initialize the rightAligned property for a
- TextBalloon item.
-
- \snippet customitems/painteditem/textballoon.cpp 0
-
- Then we implement the \c paint() function which is automatically called by
- the Scene Graph framework to paint the contents of the item. The function
- paints the item in local coordinates.
-
- \snippet customitems/painteditem/textballoon.cpp 1
-
- We start with setting the pen and brush on the item to define the look of
- the item. After that we start drawing. Note that the \l {QQuickPaintedItem::}{contentsBoundingRect()}
- item is called to draw depending on the size of the item. The rectangle
- returned by the \l {QQuickPaintedItem::}{contentsBoundingRect()} function is the size
- of the item as defined in the QML file.
-
- \section1 Textballoons.qml File
-
- The Interface consists of two main parts. The scrollable area with the
- textballoons and the controls button to add new balloons.
-
- \section2 BalloonView
-
- \snippet customitems/painteditem/textballoons.qml 0
-
- The balloonModel contains two types at application start which will be
- displayed by the balloonView. The balloonView alernates the TextBalloon
- delegate items between left-aligned and right-aligned.
-
- \section2 Controls
-
- \snippet customitems/painteditem/textballoons.qml 1
-
- The controls part of the UI contains a rectangle with a MouseArea which
- changes color when the mouse hovers over it. This control 'button' adds
- a new object to the end of the model with a random width.
-
- */