QT项目-Chart Themes Example学习（一）

#include "themewidget.h"
#include <QtWidgets/QApplication>
#include <QtWidgets/QMainWindow>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QMainWindow window;
    ThemeWidget *widget = new ThemeWidget();
    window.setCentralWidget(widget);
    window.resize(900, 600);
    window.show();
    return a.exec();
}

void QMainWindow::setCentralWidget(QWidget *widget)

//将给定的小部件设置为主窗口的中央小部件

Sets the given widget to be the main window‘s central widget.  

//注意：QMainWindow拥有窗口小部件指针的所有权，并在适当的时间将其删除。另请参见centralWidget（）。

Note: QMainWindow takes ownership of the widget pointer and deletes it at the appropriate time. See also centralWidget().

QWidget *QMainWindow::centralWidget() const

//返回主窗口的中央窗口小部件。如果尚未设置中央窗口小部件，则此函数返回零。

Returns the central widget for the main window. This function returns zero if the central widget has not been set.

#ifndef THEMEWIDGET_H
#define THEMEWIDGET_H

#include <QtWidgets/QWidget>
#include <QtCharts/QChartGlobal>

QT_BEGIN_NAMESPACE
class QComboBox;
class QCheckBox;
class Ui_ThemeWidgetForm;
QT_END_NAMESPACE

QT_CHARTS_BEGIN_NAMESPACE
class QChartView;
class QChart;
QT_CHARTS_END_NAMESPACE

typedef QPair<QPointF, QString> Data;
typedef QList<Data> DataList;
typedef QList<DataList> DataTable;

QT_CHARTS_USE_NAMESPACE

class ThemeWidget: public QWidget
{
    Q_OBJECT
public:
    explicit ThemeWidget(QWidget *parent = 0);
    ~ThemeWidget();

private Q_SLOTS:
    void updateUI();

private:
    DataTable generateRandomData(int listCount, int valueMax, int valueCount) const;
    void populateThemeBox();
    void populateAnimationBox();
    void populateLegendBox();
    void connectSignals();
    QChart *createAreaChart() const;
    QChart *createBarChart(int valueCount) const;
    QChart *createPieChart() const;
    QChart *createLineChart() const;
    QChart *createSplineChart() const;
    QChart *createScatterChart() const;

private:
    int m_listCount;
    int m_valueMax;
    int m_valueCount;
    QList<QChartView *> m_charts;
    DataTable m_dataTable;

    Ui_ThemeWidgetForm *m_ui;
};

#endif /* THEMEWIDGET_H */