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authorTor Arne Vestbø <tor.arne.vestbo@qt.io>2023-06-26 13:34:51 +0200
committerTor Arne Vestbø <tor.arne.vestbo@qt.io>2023-06-26 23:15:02 +0200
commite46fb69a87c46e812cc09b3f131462c99aae85d8 (patch)
tree40934033db0937b3fa103cd177079f41100847e7 /examples/widgets/doc/src
parent3a8265a4290e3405c08811e815edb8432d873a81 (diff)
Move chart example to manual test
Pick-to: 6.5 6.6 Change-Id: I95a40834853a0157d8fa6137431bfd86ce855b2f Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
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-// Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
-
-/*!
- \example itemviews/chart
- \title Chart Example
- \ingroup examples-itemviews
- \brief The Chart example shows how to create a custom view for the model/view framework.
-
- \image chart-example.png
-
- In this example, the items in a table model are represented as slices in a pie chart,
- relying on the flexibility of the model/view architecture to handle custom editing
- and selection features.
-
- \b{Note that you only need to create a new view class if your data requires a
- specialized representation.} You should first consider using a standard QListView,
- QTableView, or QTreeView with a custom QItemDelegate subclass if you need to
- represent data in a special way.
-
- \omit
- \section1 PieView Class Definition
-
- The \c PieView class is a subclass of QAbstractItemView. The base class provides
- much of the functionality required by view classes, so we only need to provide
- implementations for three public functions: visualRect(), scrollTo(), and
- indexAt(). However, the view needs to maintain strict control over its look and
- feel, so we also provide implementations for a number of other functions:
-
- \snippet itemviews/chart/pieview.h 0
-
-
-
- \section1 PieView Class Implementation
-
- The paint event renders the data from the standard item model as a pie chart.
- We interpret the data in the following way:
-
- \list
- \li Column 0 contains data in two different roles:
- The \l{Qt::ItemDataRole}{DisplayRole} contains a label, and the
- \l{Qt::ItemDataRole}{DecorationRole} contains the color of the pie slice.
- \li Column 1 contains a quantity which we will convert to the angular extent of
- the slice.
- \endlist
-
- The figure is always drawn with the chart on the left and the key on
- the right. This means that we must try and obtain an area that is wider
- than it is tall. We do this by imposing a particular aspect ratio on
- the chart and applying it to the available vertical space. This ensures
- that we always obtain the maximum horizontal space for the aspect ratio
- used.
- We also apply fixed size margin around the figure.
-
- We use logical coordinates to draw the chart and key, and position them
- on the view using viewports.
- \endomit
-*/