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<h1 class="title">view.cpp Example File</h1>
<span class="subtitle">callout/view.cpp</span>
<!-- $$$callout/view.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Charts module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL$
** 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 General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include "view.h"</span>
<span class="preprocessor">#include <QtGui/QResizeEvent></span>
<span class="preprocessor">#include <QtWidgets/QGraphicsScene></span>
<span class="preprocessor">#include <QtCharts/QChart></span>
<span class="preprocessor">#include <QtCharts/QLineSeries></span>
<span class="preprocessor">#include <QtCharts/QSplineSeries></span>
<span class="preprocessor">#include <QtWidgets/QGraphicsTextItem></span>
<span class="preprocessor">#include "callout.h"</span>
<span class="preprocessor">#include <QtGui/QMouseEvent></span>
View<span class="operator">::</span>View(<span class="type">QWidget</span> <span class="operator">*</span>parent)
: <span class="type">QGraphicsView</span>(<span class="keyword">new</span> <span class="type">QGraphicsScene</span><span class="operator">,</span> parent)<span class="operator">,</span>
m_coordX(<span class="number">0</span>)<span class="operator">,</span>
m_coordY(<span class="number">0</span>)<span class="operator">,</span>
m_chart(<span class="number">0</span>)<span class="operator">,</span>
m_tooltip(<span class="number">0</span>)
{
setDragMode(<span class="type">QGraphicsView</span><span class="operator">::</span>NoDrag);
setVerticalScrollBarPolicy(<span class="type">Qt</span><span class="operator">::</span>ScrollBarAlwaysOff);
setHorizontalScrollBarPolicy(<span class="type">Qt</span><span class="operator">::</span>ScrollBarAlwaysOff);
<span class="comment">// chart</span>
m_chart <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qchart.html">QChart</a></span>;
m_chart<span class="operator">-</span><span class="operator">></span>setMinimumSize(<span class="number">640</span><span class="operator">,</span> <span class="number">480</span>);
m_chart<span class="operator">-</span><span class="operator">></span>setTitle(<span class="string">"Hover the line to show callout. Click the line to make it stay"</span>);
m_chart<span class="operator">-</span><span class="operator">></span>legend()<span class="operator">-</span><span class="operator">></span>hide();
<span class="type"><a href="qlineseries.html">QLineSeries</a></span> <span class="operator">*</span>series <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineseries.html">QLineSeries</a></span>;
series<span class="operator">-</span><span class="operator">></span>append(<span class="number">1</span><span class="operator">,</span> <span class="number">3</span>);
series<span class="operator">-</span><span class="operator">></span>append(<span class="number">4</span><span class="operator">,</span> <span class="number">5</span>);
series<span class="operator">-</span><span class="operator">></span>append(<span class="number">5</span><span class="operator">,</span> <span class="number">4.5</span>);
series<span class="operator">-</span><span class="operator">></span>append(<span class="number">7</span><span class="operator">,</span> <span class="number">1</span>);
series<span class="operator">-</span><span class="operator">></span>append(<span class="number">11</span><span class="operator">,</span> <span class="number">2</span>);
m_chart<span class="operator">-</span><span class="operator">></span>addSeries(series);
<span class="type"><a href="qsplineseries.html">QSplineSeries</a></span> <span class="operator">*</span>series2 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qsplineseries.html">QSplineSeries</a></span>;
series2<span class="operator">-</span><span class="operator">></span>append(<span class="number">1.6</span><span class="operator">,</span> <span class="number">1.4</span>);
series2<span class="operator">-</span><span class="operator">></span>append(<span class="number">2.4</span><span class="operator">,</span> <span class="number">3.5</span>);
series2<span class="operator">-</span><span class="operator">></span>append(<span class="number">3.7</span><span class="operator">,</span> <span class="number">2.5</span>);
series2<span class="operator">-</span><span class="operator">></span>append(<span class="number">7</span><span class="operator">,</span> <span class="number">4</span>);
series2<span class="operator">-</span><span class="operator">></span>append(<span class="number">10</span><span class="operator">,</span> <span class="number">2</span>);
m_chart<span class="operator">-</span><span class="operator">></span>addSeries(series2);
m_chart<span class="operator">-</span><span class="operator">></span>createDefaultAxes();
m_chart<span class="operator">-</span><span class="operator">></span>setAcceptHoverEvents(<span class="keyword">true</span>);
setRenderHint(<span class="type">QPainter</span><span class="operator">::</span>Antialiasing);
scene()<span class="operator">-</span><span class="operator">></span>addItem(m_chart);
m_coordX <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QGraphicsSimpleTextItem</span>(m_chart);
m_coordX<span class="operator">-</span><span class="operator">></span>setPos(m_chart<span class="operator">-</span><span class="operator">></span>size()<span class="operator">.</span>width()<span class="operator">/</span><span class="number">2</span> <span class="operator">-</span> <span class="number">50</span><span class="operator">,</span> m_chart<span class="operator">-</span><span class="operator">></span>size()<span class="operator">.</span>height());
m_coordX<span class="operator">-</span><span class="operator">></span>setText(<span class="string">"X: "</span>);
m_coordY <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QGraphicsSimpleTextItem</span>(m_chart);
m_coordY<span class="operator">-</span><span class="operator">></span>setPos(m_chart<span class="operator">-</span><span class="operator">></span>size()<span class="operator">.</span>width()<span class="operator">/</span><span class="number">2</span> <span class="operator">+</span> <span class="number">50</span><span class="operator">,</span> m_chart<span class="operator">-</span><span class="operator">></span>size()<span class="operator">.</span>height());
m_coordY<span class="operator">-</span><span class="operator">></span>setText(<span class="string">"Y: "</span>);
connect(series<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qlineseries.html">QLineSeries</a></span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>View<span class="operator">::</span>keepCallout);
connect(series<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qlineseries.html">QLineSeries</a></span><span class="operator">::</span>hovered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>View<span class="operator">::</span>tooltip);
connect(series2<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qsplineseries.html">QSplineSeries</a></span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>View<span class="operator">::</span>keepCallout);
connect(series2<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qsplineseries.html">QSplineSeries</a></span><span class="operator">::</span>hovered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>View<span class="operator">::</span>tooltip);
<span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>setMouseTracking(<span class="keyword">true</span>);
}
<span class="type">void</span> View<span class="operator">::</span>resizeEvent(<span class="type">QResizeEvent</span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (scene()) {
scene()<span class="operator">-</span><span class="operator">></span>setSceneRect(<span class="type">QRect</span>(<span class="type">QPoint</span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)<span class="operator">,</span> event<span class="operator">-</span><span class="operator">></span>size()));
m_chart<span class="operator">-</span><span class="operator">></span>resize(event<span class="operator">-</span><span class="operator">></span>size());
m_coordX<span class="operator">-</span><span class="operator">></span>setPos(m_chart<span class="operator">-</span><span class="operator">></span>size()<span class="operator">.</span>width()<span class="operator">/</span><span class="number">2</span> <span class="operator">-</span> <span class="number">50</span><span class="operator">,</span> m_chart<span class="operator">-</span><span class="operator">></span>size()<span class="operator">.</span>height() <span class="operator">-</span> <span class="number">20</span>);
m_coordY<span class="operator">-</span><span class="operator">></span>setPos(m_chart<span class="operator">-</span><span class="operator">></span>size()<span class="operator">.</span>width()<span class="operator">/</span><span class="number">2</span> <span class="operator">+</span> <span class="number">50</span><span class="operator">,</span> m_chart<span class="operator">-</span><span class="operator">></span>size()<span class="operator">.</span>height() <span class="operator">-</span> <span class="number">20</span>);
<span class="keyword">const</span> <span class="keyword">auto</span> callouts <span class="operator">=</span> m_callouts;
<span class="keyword">for</span> (Callout <span class="operator">*</span>callout : callouts)
callout<span class="operator">-</span><span class="operator">></span>updateGeometry();
}
<span class="type">QGraphicsView</span><span class="operator">::</span>resizeEvent(event);
}
<span class="type">void</span> View<span class="operator">::</span>mouseMoveEvent(<span class="type">QMouseEvent</span> <span class="operator">*</span>event)
{
m_coordX<span class="operator">-</span><span class="operator">></span>setText(<span class="type">QString</span>(<span class="string">"X: %1"</span>)<span class="operator">.</span>arg(m_chart<span class="operator">-</span><span class="operator">></span>mapToValue(event<span class="operator">-</span><span class="operator">></span>pos())<span class="operator">.</span>x()));
m_coordY<span class="operator">-</span><span class="operator">></span>setText(<span class="type">QString</span>(<span class="string">"Y: %1"</span>)<span class="operator">.</span>arg(m_chart<span class="operator">-</span><span class="operator">></span>mapToValue(event<span class="operator">-</span><span class="operator">></span>pos())<span class="operator">.</span>y()));
<span class="type">QGraphicsView</span><span class="operator">::</span>mouseMoveEvent(event);
}
<span class="type">void</span> View<span class="operator">::</span>keepCallout()
{
m_callouts<span class="operator">.</span>append(m_tooltip);
m_tooltip <span class="operator">=</span> <span class="keyword">new</span> Callout(m_chart);
}
<span class="type">void</span> View<span class="operator">::</span>tooltip(<span class="type">QPointF</span> point<span class="operator">,</span> bool state)
{
<span class="keyword">if</span> (m_tooltip <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
m_tooltip <span class="operator">=</span> <span class="keyword">new</span> Callout(m_chart);
<span class="keyword">if</span> (state) {
m_tooltip<span class="operator">-</span><span class="operator">></span>setText(<span class="type">QString</span>(<span class="string">"X: %1 \nY: %2 "</span>)<span class="operator">.</span>arg(point<span class="operator">.</span>x())<span class="operator">.</span>arg(point<span class="operator">.</span>y()));
m_tooltip<span class="operator">-</span><span class="operator">></span>setAnchor(point);
m_tooltip<span class="operator">-</span><span class="operator">></span>setZValue(<span class="number">11</span>);
m_tooltip<span class="operator">-</span><span class="operator">></span>updateGeometry();
m_tooltip<span class="operator">-</span><span class="operator">></span>show();
} <span class="keyword">else</span> {
m_tooltip<span class="operator">-</span><span class="operator">></span>hide();
}
}
</pre>
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<!-- @@@callout/view.cpp -->
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