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/****************************************************************************
**
** Copyright (C) 2017 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.
** $QT_END_LICENSE$
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****************************************************************************/
/*!
\title Qt Quick TableViews examples - Pixelator
\example pixelator
\brief The Pixelator example shows how a QML TableView and a delegate
can be used for custom table models.
\image qt-pixelator.png
\ingroup qtquickexamples
\include examples-run.qdocinc
\snippet pixelator/imagemodel.h model
We only require a simple, read-only table model. Thus, we need to implement
functions to indicate the dimensions of the image and supply data to the
TableView.
We use the \l{Qt property system}{Qt Property System} and a source property
as \c QString to set the path of the image.
\snippet pixelator/imagemodel.cpp setsource
Here we load the image when the source path is set.
When the source path has changed, we need to call \c beginResetModel() before.
After the image has been loaded, we need to call \c endResetModel().
\snippet pixelator/imagemodel.cpp rowcolcount
The row and column count is set to image height and width, respectively.
\snippet pixelator/imagemodel.cpp data
This overloaded function allows us to access the pixel data from the image.
When we call this function with the display role, we return the pixel's
gray value.
\snippet pixelator/main.cpp registertype
We need to register our model in the QML type system to be able to use it
from the QML side.
\snippet pixelator/main.qml pixelcomponent
Each pixel in the \c TableView is displayed via a delegate component.
It contains an item that has an implicit height and width defining the
cell size of the table.
It also has a property for the gray value of the pixel that is retrieved
from the model.
\snippet pixelator/main.qml rectshape
Inside the \c Item, there is a rounded \c Rectangle with the size and
radius according to the pixel's gray value.
\snippet pixelator/main.qml interaction
For a little bit of interaction, we place a \c MouseArea inside the \c Item
and change the Rectangle's color on mouse over.
\snippet pixelator/main.qml animation
The \c Rectangle also has a short color animation to fade between the
colors when it is changed.
\snippet pixelator/main.qml tableview
The \c TableView spans over the whole window and has an instance of our
custom \c ImageModel attached.
*/
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