Qt/C++检测QPushButton悬停到播放声音

Question

当我的一个QPushButton被鼠标光标悬停时，我想在我的应用程序中播放一个声音。

我正在乞求学习C++，我试着写这个：

onhover.h

#ifndef ONHOVER_H
#define ONHOVER_H
#include <QDebug>
#include <QApplication>
#include <QWidget>
#include <QPushButton>
class onhover : public QPushButton
{
Q_OBJECT
public:
onhover() {
setMouseTracking(true);
setMinimumSize(100, 100);
}
public: Q_SIGNALS:
void hovered();
protected:
virtual void enterEvent( QEvent* e );
};
#endif // ONHOVER_H

主窗口.cpp

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

#include <QDesktopServices>
#include <QProcess>
#include <qurl.h>
#include <QMessageBox>
#include <QSettings>
#include <fstream>
#include <string>
#include <sstream>
#include <iostream>
#include <QByteRef>
#include <QMetaType>
#include <QByteArray>
#include <QFile>
#include <QtMultimedia/QSound>
#include <QObject>
#include <QMouseEvent>
#include <QEvent>
#include <QtMultimedia/QMediaPlayer>
#include <QFileInfo>
#include "onhover.h"
#include <QWidget>
using namespace std;
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
bool is_readable( const std::string & file )
{
std::ifstream fichier( file.c_str() );
return (bool) fichier != 0;
}
void onhover::enterEvent( QEvent* e )
{
Q_EMIT hovered();
// don't forget to forward the event
QWidget::enterEvent( e );
}

void MainWindow::on_ConfigORCA_clicked()
{
QMediaPlayer *player = new QMediaPlayer;
player->setMedia(QUrl::fromLocalFile(QFileInfo("Sound/7-AccesHandicap.ogg.wav").absoluteFilePath()));
player->setVolume(50);
player->play();
QProcess *myProcess1 = new QProcess(this);
myProcess1->startDetached("kcmshell5 kcmaccess");
}
void MainWindow::on_Discord_clicked()
{
QMediaPlayer *player = new QMediaPlayer;
player->setMedia(QUrl::fromLocalFile(QFileInfo("Sound/10-DiscordLink.ogg.wav").absoluteFilePath()));
player->setVolume(50);
player->play();
QDesktopServices::openUrl(QUrl("https://discord.gg/zG7g8cU", QUrl::TolerantMode));
}
void MainWindow::on_NoComprendo_clicked()
{
using std::cout;
if ( is_readable( "/usr/bin/nocomprendo" ) )
{
QProcess *myProcess3 = new QProcess(this);
myProcess3->startDetached("/usr/bin/nocomprendo");
}
else
{
/* Le fichier n'existe pas */
QMessageBox::warning(this, "NoComprendo Non Installé", "Veuillez suivre les instructions d'installation sur la page web qui va s'ouvrir");
QDesktopServices::openUrl(QUrl("https://github.com/handyopensource/dvkbuntu-script-tts", QUrl::TolerantMode));
}
}
void MainWindow::on_OuvrirNavigateur_clicked()
{
QDesktopServices::openUrl(QUrl("file:///home/Accueil_local/index.html", QUrl::TolerantMode));
}
void MainWindow::on_OuvrirKmag_clicked()
{
QProcess *myProcess3 = new QProcess(this);
myProcess3->startDetached("/usr/bin/kmag");
}
void MainWindow::on_OuvrirSiteWeb_clicked()
{
QDesktopServices::openUrl(QUrl("https://www.dvkbuntu.org", QUrl::TolerantMode));
}
void MainWindow::on_Contacts_clicked()
{
QDesktopServices::openUrl(QUrl("mailto:[e-mail]?subject=DVKBuntu&body=Bonjour n n nCordialementnPrénom Nom"));
}
void MainWindow::on_ScaleFactor_valueChanged(int value)
{
float fvalue = value;
scale=fvalue/10;
ostringstream newscale;
newscale<<scale;
QString newnewscale = QString::fromStdString(newscale.str());
QProcess::startDetached("/opt/dvkbuntu-menu-acceuil/ScaleFactor.sh", QStringList {newnewscale});
}
void MainWindow::on_ScaleFactor_sliderReleased()
{
//QByteArray arrayScale(reinterpret_cast<const char*>(&scale),sizeof(scale));
//qputenv("QT_SCALE_FACTOR",arrayScale);
QMessageBox messageBox;
QString textScale;
messageBox.critical(0,"Redémarrage requis", "Le nouveau facteur d'échelle est de " + textScale.setNum (scale) + ", les changements d'échelles n'interviendront qu'après un redémarrage");
messageBox.setFixedSize(500,200);
}
void MainWindow::on_Power_clicked()
{
system("qdbus org.kde.ksmserver /KSMServer org.kde.KSMServerInterface.logout 0 2 3");
}
void MainWindow::on_Reboot_clicked()
{
system("qdbus org.kde.ksmserver /KSMServer org.kde.KSMServerInterface.logout 0 1 3");
}
void MainWindow::on_Deconnection_clicked()
{
system("qdbus org.kde.ksmserver /KSMServer org.kde.KSMServerInterface.logout 0 0 3");
}

main.cpp

#include "mainwindow.h"
#include <QApplication>
#include <QtWidgets>
#include "ui_mainwindow.h"
#include "onhover.h"
int main(int argc, char *argv[])
{
QApplication::setAttribute(Qt::AA_EnableHighDpiScaling); // DPI support
QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps); //HiDPI pixmaps
QApplication a(argc, argv);
a.setWindowIcon(QIcon(":/images/Logo.png"));
MainWindow w;
w.show();
connect( Ui::MainWindow::ConfigORCA, SIGNAL(hovered()), this, SLOT(do_something_when_button_hovered()) ); //this is in error
return a.exec();
}

我在残疾人访问方面工作。播放的声音是为了帮助盲人。其他文件(除了已更改为向上写入的文件(如下所示：https://github.com/handyopensource/dvkbuntu-menu-acceuil

我的应用程序是一个非常简单的菜单，有一个大按钮。

那不管用，怎么办

谢谢。

Answer 1

您可以使用事件过滤器来检测小部件上的悬停。在这里阅读Qt事件系统上的所有必要内容。

这里有一个工作示例，它播放资源文件中的声音(在这里阅读您需要的关于Qt资源系统的一切(，更改标签的背景并打印到屏幕上(我有这两个调试选项(：

主窗口.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QMediaPlayer>
namespace Ui
{
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget* parent = nullptr);
~MainWindow();
virtual bool eventFilter(QObject* watched, QEvent* event);
private:
Ui::MainWindow* ui;
QMediaPlayer* player_ = nullptr;
};
#endif  // MAINWINDOW_H

主窗口.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QEvent>
#include <QMediaPlaylist>
#include <QUrl>
MainWindow::MainWindow(QWidget* parent) : QMainWindow(parent), ui(new Ui::MainWindow)
{
Q_INIT_RESOURCE(qt_resources);
ui->setupUi(this);
ui->pushButton->installEventFilter(this);
ui->label->setStyleSheet("background-color: red");
}
MainWindow::~MainWindow()
{
delete ui;
}
bool MainWindow::eventFilter(QObject* watched, QEvent* event)
{
if (watched == ui->pushButton && event->type() == QEvent::HoverEnter)
{
qDebug() << "Start hover";
ui->label->setStyleSheet("background-color: green");
if (!player_)
{
QMediaPlaylist* playlist = new QMediaPlaylist();
playlist->addMedia(QUrl("qrc:/push_button.mp3"));
playlist->setPlaybackMode(QMediaPlaylist::Loop);
player_ = new QMediaPlayer(this);
player_->setPlaylist(playlist);
player_->setVolume(50);
player_->play();
}
}
else if (watched == ui->pushButton && event->type() == QEvent::HoverLeave)
{
qDebug() << "End hover";
ui->label->setStyleSheet("background-color: red");
if (player_)
{
player_->stop();
player_->deleteLater();
player_ = nullptr;
}
}
return QMainWindow::eventFilter(watched, event);
}

主

#include <QApplication>
#include "mainwindow.h"
int main(int argc, char** argv)
{
QApplication app(argc, argv);
MainWindow* mw = new MainWindow;
mw->show();
return app.exec();
}

你可以在这里下载工作项目(在Ubuntu 18.04和Qt 5.9.5上测试(。