qt c++ QChart->setGeometry 在 MainWindow 中不起作用

Posted 2023-03-30

【中文标题】qt c++ QChart->setGeometry 在 MainWindow 中不起作用

【英文标题】：qt c++ QChart->setGeometry does not work in MainWindow

【发布时间】：2021-07-14 17:52:22

【问题描述】：

我创建了一个内部带有 QChart 的对象和带有 2 个 QPushButton 的 MainWindow，当我尝试显示我的 QChart 时，它会占用所有窗口。如果我想调整 QChart 的大小，一切正常，但如果我尝试移动它，则没有任何作用（使用 setGeometry 或 setContentMargin）。

ma​​in.cpp

#include <QApplication>

#include "Mainwindow.h"
#include "MainChart.h"


int main(int argc, char **argv)

    QApplication app(argc, argv);
    MainWindow w(1920, 1080);
    MainChart chart;

    chart.setGeometry(250,0,1670,1080); // >> KO

    w.setCentralWidget(chart.get_view());
//    w.centralWidget()->setMaximumSize(1670, 1080); >> OK
//    w.centralWidget()->setContentsMargins(250,0,0,0); >> KO

    w.show();
    return app.exec();

其他文件，我认为这不会有用，但如果需要：

MainWindow.cpp

#include <QMainWindow>
#include <QWidget>
#include <QtGui>
#include <QAction>
#include <Qt>
#include <QKeySequence>
#include <QtCore>
#include <iostream>

#include "Mainwindow.h"

MainWindow::MainWindow(int _width, int _height, QMainWindow *parent)
: width(_width), height(_height), QMainWindow(parent)

    this->setStyleSheet("MainWindow background-color: rgb(40,40,40);");

    this->setWindowFlags( Qt::CustomizeWindowHint );
    this->showFullScreen();
    this->setFixedSize(width, height);

    configure_new_button();
    configure_exit_button();
    configure_escape();


MainWindow::~MainWindow()

    free(exit_btn);
    free(new_btn);
    free(escape);


void MainWindow::configure_exit_button()

    exit_btn = new QPushButton(this);
    exit_btn->connect(exit_btn, SIGNAL(clicked()),this, SLOT(exit()));
    exit_btn->setGeometry(0, height - 100, 100, 100);
    exit_btn->setStyleSheet("QPushButton background-color: rgb(150,150,150);");

    QFont font = exit_btn->font();
    font.setPointSize(32);
    exit_btn->setFont(font);

    exit_btn->setIcon(QIcon(":/Icons/close.png"));
    exit_btn->setIconSize(QSize(65, 65));

    exit_btn->show();


void MainWindow::configure_new_button()

    new_btn = new QPushButton(this);
    new_btn->setGeometry(0, 0, 100, 100);
    new_btn->connect(new_btn, SIGNAL(clicked()),this, SLOT(new_entry()));
    new_btn->setStyleSheet("background-color: rgb(0,0,200);" "color: black");

    QFont font = new_btn->font();
    font.setPointSize(32);
    new_btn->setFont(font);

    new_btn->setIcon(QIcon(":/Icons/nouveau.png"));
    new_btn->setIconSize(QSize(65, 65));

    new_btn->show();


void MainWindow::configure_escape()

    escape = new QAction( "text4ESC", this );
    escape->setShortcut( Qt::Key_Escape );
    escape->setShortcutContext( Qt::WindowShortcut );
    connect(escape, SIGNAL(triggered()), this, SLOT(exit()));
    addAction(escape);


void MainWindow::exit()

    close();
    qApp->quit();


void MainWindow::new_entry()

    std::cout << "coucou !!!" << std::endl;

主窗口.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QWidget>
#include <QObject>
#include <QPushButton>
#include <QEvent>
#include <QKeyEvent>


class MainWindow : public QMainWindow

    Q_OBJECT

    public:
        MainWindow(int _width, int _height, QMainWindow *parent = 0);
        ~MainWindow();
        void configure_exit_button();
        void configure_new_button();
        void configure_escape();

    private slots:
        void exit();
        void new_entry();

    private:
        QPushButton *exit_btn;
        QPushButton *new_btn;
        QAction *escape;
        int width;
        int height;
;

#endif //MAINWINDOW_H

Mainchart.cpp

#include "MainChart.h"

MainChart::MainChart(QChart *Parent)

    QBarSet *set0 = new QBarSet("Altuve");
    QBarSet *set1 = new QBarSet("Martine");
    QBarSet *set2 = new QBarSet("Bob");

    *set0 << 256 << 954 << 752 << 148 << 596 << 214;
    *set1 << 586 << 369 << 485 << 874 << 693 << 587;
    *set2 << 785 << 963 << 547 << 745 << 657 << 874;

    QFont font;
    font.setPixelSize(18);

    QBarSeries *series = new QBarSeries();
    series->append(set0);
    series->append(set1);
    series->append(set2);

    QChart *chart = new QChart();
    chart->addSeries(series);
    chart->setTitle("Mon Super Graphique");
    chart->setTitleFont(font);
    chart->setTitleBrush(QBrush(qRgb(255,255,255)));
    chart->setAnimationOptions(QChart::AllAnimations);

    QStringList categories;
    categories << "2013" << "2014" << "2015" << "2016" << "2017";

    QBarCategoryAxis *axis = new QBarCategoryAxis();
    axis->append(categories);
    chart->createDefaultAxes();
    chart->setAxisX(axis, series);

    font.setPixelSize(12);
    chart->axisX()->setLabelsBrush(QBrush(qRgb(255,255,255)));
    chart->axisX()->setLabelsFont(font);
    chart->axisY()->setLabelsBrush(QBrush(qRgb(255,255,255)));
    chart->axisY()->setLabelsFont(font);

    chart->legend()->setVisible(true);
    chart->legend()->setAlignment(Qt::AlignBottom);
    chart->legend()->setLabelColor(qRgb(255,255,255));
    chart->legend()->setFont(font);

    chart->setBackgroundBrush(QBrush(QRgb(0x0)));

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

MainChart::~MainChart() 

QChartView * MainChart::get_view()

    return chartView;

Mainchart.h

#ifndef NEW_MAINCHART_H
#define NEW_MAINCHART_H

#include <QtCharts/QChartView>
#include <QtCharts/QSplineSeries>
#include <QtCharts/QBarSeries>
#include <QtCharts/QBarSet>
#include <QtCharts/QBarCategoryAxis>

QT_CHARTS_USE_NAMESPACE

class MainChart : public QChart

    public:
        MainChart(QChart *Parent = 0);
        ~MainChart();
        QChartView *get_view();

    private:
        QChartView *chartView;
;


#endif //NEW_MAINCHART_H

【参考方案1】：

我想你想看看使用布局。我并不完全肯定，但是将图表作为窗口的中心小部件意味着它将占用所有空间——就像它的行为方式一样。

听起来您应该做的是创建一个小部件并将其视为一个容器。它成为您的中心小部件，然后您向其中添加内容。但如果没有布局，您将获得奇怪的调整大小行为。

习惯于使用布局而不是硬编码的大小和位置来处理布局确实要好得多。您必须将小部件用作容器才能使事情正常进行，但是我尝试做的所有事情我都能够做到。