有时候任务是分不同人开发的，如何把结果汇总到一个界面呢？
或者有些好的类是自己封装后，可以无限复制使用，怎么挪到自己的主程序呢？
以下举个小例子记录一下，我也备份一下
说明：
我有一个派生类，继承于QWidget，功能是用来绘制折线图的（直接QT例子粘贴的）
还有一个主程序，MainWindow，里面有一个QWidget占位，用来绘制折线图
如何把折线图绘制的QWidget放置到主程序里面的QWidget呢？
继承类：
cpp
/****************************************************************************
**
** 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef MAINWIDGET_H
#define MAINWIDGET_H
#include <QtCharts/QChartGlobal>
#include <QtCharts/QChart>
#include <QtCharts/QChartView>
#include <QtWidgets/QWidget>
#include <QtWidgets/QGraphicsWidget>
#include <QtWidgets/QGridLayout>
#include <QtWidgets/QGraphicsGridLayout>
#include <QtWidgets/QDoubleSpinBox>
#include <QtWidgets/QGroupBox>
#include <QtCharts/QLineSeries>
QT_CHARTS_USE_NAMESPACE
class MainWidget : public QWidget
{
Q_OBJECT
public:
explicit MainWidget(QWidget *parent = 0);
void addSeries();
void connectMarkers();
public slots:
void removeSeries();
void disconnectMarkers();
void handleMarkerClicked();
private:
QChart *m_chart;
QList<QLineSeries *> m_series;
QChartView *m_chartView;
QGridLayout *m_mainLayout;
QGridLayout *m_fontLayout;
};
#endif // MAINWIDGET_H
cpp
/****************************************************************************
**
** 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "mainwidget.h"
#include <QtCharts/QChart>
#include <QtCharts/QChartView>
#include <QtWidgets/QPushButton>
#include <QtWidgets/QLabel>
#include <QtCore/QDebug>
#include <QtCharts/QLegend>
#include <QtWidgets/QFormLayout>
#include <QtCharts/QLegendMarker>
#include <QtCharts/QLineSeries>
#include <QtCharts/QXYLegendMarker>
#include <QtCore/QtMath>
QT_CHARTS_USE_NAMESPACE
MainWidget::MainWidget(QWidget *parent) :
QWidget(parent)
{
// Create chart view with the chart
m_chart = new QChart();
m_chartView = new QChartView(m_chart, this);
// Create layout for grid and detached legend
m_mainLayout = new QGridLayout();
m_mainLayout->addWidget(m_chartView, 0, 1, 3, 1);
setLayout(m_mainLayout);
// Add few series
addSeries();
addSeries();
addSeries();
addSeries();
connectMarkers();
// Set the title and show legend
m_chart->setTitle("Legendmarker example (click on legend)");
m_chart->legend()->setVisible(true);
m_chart->legend()->setAlignment(Qt::AlignBottom);
m_chartView->setRenderHint(QPainter::Antialiasing);
}
void MainWidget::addSeries()
{
QLineSeries *series = new QLineSeries();
m_series.append(series);
series->setName(QString("line " + QString::number(m_series.count())));
// Make some sine wave for data
QList<QPointF> data;
int offset = m_chart->series().count();
for (int i = 0; i < 360; i++) {
qreal x = offset * 20 + i;
data.append(QPointF(i, qSin(qDegreesToRadians(x))));
}
series->append(data);
m_chart->addSeries(series);
if (m_series.count() == 1)
m_chart->createDefaultAxes();
}
void MainWidget::removeSeries()
{
// Remove last series from chart
if (m_series.count() > 0) {
QLineSeries *series = m_series.last();
m_chart->removeSeries(series);
m_series.removeLast();
delete series;
}
}
void MainWidget::connectMarkers()
{
//![1]
// Connect all markers to handler
const auto markers = m_chart->legend()->markers();
for (QLegendMarker *marker : markers)
{
// Disconnect possible existing connection to avoid multiple connections
QObject::disconnect(marker, &QLegendMarker::clicked,
this, &MainWidget::handleMarkerClicked);
QObject::connect(marker, &QLegendMarker::clicked, this, &MainWidget::handleMarkerClicked);
}
//![1]
}
void MainWidget::disconnectMarkers()
{
//![2]
const auto markers = m_chart->legend()->markers();
for (QLegendMarker *marker : markers) {
QObject::disconnect(marker, &QLegendMarker::clicked,
this, &MainWidget::handleMarkerClicked);
}
//![2]
}
void MainWidget::handleMarkerClicked()
{
//![3]
QLegendMarker* marker = qobject_cast<QLegendMarker*> (sender());
Q_ASSERT(marker);
//![3]
//![4]
switch (marker->type())
//![4]
{
case QLegendMarker::LegendMarkerTypeXY:
{
//![5]
// Toggle visibility of series
marker->series()->setVisible(!marker->series()->isVisible());
// Turn legend marker back to visible, since hiding series also hides the marker
// and we don't want it to happen now.
marker->setVisible(true);
//![5]
//![6]
// Dim the marker, if series is not visible
qreal alpha = 1.0;
if (!marker->series()->isVisible())
alpha = 0.5;
QColor color;
QBrush brush = marker->labelBrush();
color = brush.color();
color.setAlphaF(alpha);
brush.setColor(color);
marker->setLabelBrush(brush);
brush = marker->brush();
color = brush.color();
color.setAlphaF(alpha);
brush.setColor(color);
marker->setBrush(brush);
QPen pen = marker->pen();
color = pen.color();
color.setAlphaF(alpha);
pen.setColor(color);
marker->setPen(pen);
//![6]
break;
}
default:
{
qDebug() << "Unknown marker type";
break;
}
}
}实现：
1.我原来不考虑主程序代码量、不考虑代码美观，我都是直接写到主程序里面了，但是这样代码太多了，不方便管理，所以要剥离出来，单独封装
2.在代码里面直接创建实例即可，这样的话，所有图标操作全部放到chart 实例中封装对应接口就行
cpp
if (!ui->widget->layout()) {
ui->widget->setLayout(new QVBoxLayout());
}
chart = new MainWidget(this);
// 添加到布局
ui->widget->layout()->addWidget(chart);
// 可选：设置布局边距
ui->widget->layout()->setContentsMargins(0, 0, 0, 0);
//调用的时候
chart->addSeries();
chart->connectMarkers();3.或者更简单，在.ui中，找到占位的QWidget 控件，右键提升，写类名和头文件即可，后续调用就不需要代码了，只需要ui->widget占位的控件调用派生类的接口函数就行
cpp
ui->widget->addSeries();
ui->widget->connectMarkers();
可以了
