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：
/**************************************************************************** ** ** 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. ** ** $QT_END_LICENSE$ ** ****************************************************************************/#ifndefMAINWIDGET_H#defineMAINWIDGET_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_NAMESPACEclassMainWidget:publicQWidget{Q_OBJECTpublic:explicitMainWidget(QWidget*parent=0);voidaddSeries();voidconnectMarkers();publicslots:voidremoveSeries();voiddisconnectMarkers();voidhandleMarkerClicked();private:QChart*m_chart;QList<QLineSeries*>m_series;QChartView*m_chartView;QGridLayout*m_mainLayout;QGridLayout*m_fontLayout;};#endif// MAINWIDGET_H/**************************************************************************** ** ** 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_NAMESPACEMainWidget::MainWidget(QWidget*parent):QWidget(parent){// Create chart view with the chartm_chart=newQChart();m_chartView=newQChartView(m_chart,this);// Create layout for grid and detached legendm_mainLayout=newQGridLayout();m_mainLayout->addWidget(m_chartView,0,1,3,1);setLayout(m_mainLayout);// Add few seriesaddSeries();addSeries();addSeries();addSeries();connectMarkers();// Set the title and show legendm_chart->setTitle("Legendmarker example (click on legend)");m_chart->legend()->setVisible(true);m_chart->legend()->setAlignment(Qt::AlignBottom);m_chartView->setRenderHint(QPainter::Antialiasing);}voidMainWidget::addSeries(){QLineSeries*series=newQLineSeries();m_series.append(series);series->setName(QString("line "+QString::number(m_series.count())));// Make some sine wave for dataQList<QPointF>data;intoffset=m_chart->series().count();for(inti=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();}voidMainWidget::removeSeries(){// Remove last series from chartif(m_series.count()>0){QLineSeries*series=m_series.last();m_chart->removeSeries(series);m_series.removeLast();deleteseries;}}voidMainWidget::connectMarkers(){//![1]// Connect all markers to handlerconstautomarkers=m_chart->legend()->markers();for(QLegendMarker*marker:markers){// Disconnect possible existing connection to avoid multiple connectionsQObject::disconnect(marker,&QLegendMarker::clicked,this,&MainWidget::handleMarkerClicked);QObject::connect(marker,&QLegendMarker::clicked,this,&MainWidget::handleMarkerClicked);}//![1]}voidMainWidget::disconnectMarkers(){//![2]constautomarkers=m_chart->legend()->markers();for(QLegendMarker*marker:markers){QObject::disconnect(marker,&QLegendMarker::clicked,this,&MainWidget::handleMarkerClicked);}//![2]}voidMainWidget::handleMarkerClicked(){//![3]QLegendMarker*marker=qobject_cast<QLegendMarker*>(sender());Q_ASSERT(marker);//![3]//![4]switch(marker->type())//![4]{caseQLegendMarker::LegendMarkerTypeXY:{//![5]// Toggle visibility of seriesmarker->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 visibleqreal 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
if(!ui->widget->layout()){ui->widget->setLayout(newQVBoxLayout());}chart=newMainWidget(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
ui->widget->addSeries();ui->widget->connectMarkers();
可以了
