Qt向特定widget设置内容

Question

现有一个这样的ui设计

可以看出在centralWidget下我又新设置了一个mapWidget，想要只在这个里面显示一个chart。

显示chart的操作如下：

// Qt charts
    QtCharts::QLineSeries *series = new QtCharts::QLineSeries();

    series->append(0, 6);
    series->append(2, 4);
    series->append(3, 8);
    series->append(7, 4);
    series->append(10, 5);
    *series << QPointF(11, 1) << QPointF(13, 3) << QPointF(17, 6) << QPointF(18, 3) << QPointF(20, 2);

    QtCharts::QChart *chart = new QtCharts::QChart();
    chart->legend()->hide();
    chart->addSeries(series);
    chart->createDefaultAxes();
    chart->setTitle("Simple line chart example");

    QtCharts::QChartView *chartView = new QtCharts::QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);

默认的代码是，

    MainWindow w;
    w.setCentralWidget(chartView);

但这样就不是显示在我想要的这块区域里了，请问该怎么解决，谢谢！

Answer 1

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <QtCharts>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    // Get the existing widget from the UI
    QWidget *existing_widget = ui->chart_widget;

    // Create the chart
    QChart *chart = new QChart();
    QLineSeries *series = new QLineSeries();
    series->append(0, 6);
    series->append(2, 4);
    series->append(3, 8);
    series->append(7, 4);
    chart->addSeries(series);
    chart->createDefaultAxes();

    // Create the chart view
    QChartView *chart_view = new QChartView(chart, existing_widget);

    // Set the layout
    QVBoxLayout *layout = new QVBoxLayout();
    layout->addWidget(chart_view);
    existing_widget->setLayout(layout);
}

MainWindow::~MainWindow()
{
    delete ui;
}