QAction *action_choose_default_app = new QAction(menu_openwith);action_choose_default_app->setText("选择默认程序&C");menu_openwith->addAction(action_choose_default_app);connect(action_choose_default_app, &QAction::triggered, [=](){QDialog *dialog = new QDialog(this);dialog->setWindowTitle("打开方式");dialog->setFixedSize(600,500);QVBoxLayout *vbox = new QVBoxLayout;dialog->setLayout(vbox);QLabel *label = new QLabel("推荐应用 " + QString::number(actions_recommend_app.size()));vbox->addWidget(label);QListWidget *listWidget_recommend_app = new QListWidget(dialog);listWidget_recommend_app->setViewMode(QListView::IconMode);listWidget_recommend_app->setDragDropMode(QAbstractItemView::NoDragDrop);vbox->addWidget(listWidget_recommend_app);foreach (QAction *action, actions_recommend_app) {QListWidgetItem *LWI;LWI = new QListWidgetItem(action->icon(), action->text());LWI->setData(LOCATION_OF_REAL_PATH, action->property("path"));LWI->setSizeHint(QSize(120,120));listWidget_recommend_app->insertItem(listWidget_recommend_app->count() + 1, LWI);}QHBoxLayout *hbox = new QHBoxLayout;vbox->addLayout(hbox);label = new QLabel("其他应用");hbox->addWidget(label);QLineEdit *lineEdit = new QLineEdit(dialog);QAction *action_lineEdit_filter = new QAction(lineEdit);action_lineEdit_filter->setIcon(QIcon::fromTheme("search"));lineEdit->addAction(action_lineEdit_filter, QLineEdit::LeadingPosition);QAction *action_lineEdit_clear = new QAction(lineEdit);action_lineEdit_clear->setIcon(QIcon::fromTheme("edit-clear"));lineEdit->addAction(action_lineEdit_clear, QLineEdit::TrailingPosition);hbox->addWidget(lineEdit);hbox->addStretch();QListWidget *listWidget_app = new QListWidget(dialog);listWidget_app->setViewMode(QListView::IconMode);listWidget_app->setDragDropMode(QAbstractItemView::NoDragDrop);vbox->addWidget(listWidget_app);connect(action_lineEdit_filter, &QAction::triggered, [=](){openwith_filter(listWidget_app, lineEdit->text(), label);});//快捷键冲突
//        connect(lineEdit, &QLineEdit::returnPressed, [=](){
//            openwith_filter(listWidget_app, lineEdit->text(), label);
//        });connect(action_lineEdit_clear, &QAction::triggered, [=](){lineEdit->clear();openwith_filter(listWidget_app, "", label);});openwith_filter(listWidget_app, "", label);//2个QListWidget单选connect(listWidget_recommend_app, &QListWidget::itemSelectionChanged, [=](){QList<QListWidgetItem*> list_recommend_app_selected = listWidget_recommend_app->selectedItems();if (list_recommend_app_selected.size() != 0) {listWidget_app->setCurrentRow(-1);}});connect(listWidget_app, &QListWidget::itemSelectionChanged, [=](){QList<QListWidgetItem*> list_app_selected = listWidget_app->selectedItems();if (list_app_selected.size() != 0) {listWidget_recommend_app->setCurrentRow(-1);}});hbox = new QHBoxLayout;hbox->addStretch();vbox->addLayout(hbox);QCheckBox *checkBox_default_app = new QCheckBox("设为默认");hbox->addWidget(checkBox_default_app);QPushButton *pushButton_cancel = new QPushButton("取消");connect(pushButton_cancel, &QPushButton::pressed, [=](){dialog->close();});hbox->addWidget(pushButton_cancel);QPushButton *pushButton_confirm = new QPushButton("确定");connect(pushButton_confirm, &QPushButton::pressed, [=](){QListWidgetItem *LWI;QList<QListWidgetItem*> list_recommend_app_selected = listWidget_recommend_app->selectedItems();if (list_recommend_app_selected.size() != 0) {LWI = listWidget_recommend_app->selectedItems().first();} else {LWI = listWidget_app->selectedItems().first();}QString desktop = LWI->data(LOCATION_OF_REAL_PATH).toString();QString sExec = readSettings(desktop, "Desktop Entry", "Exec");sExec = sExec.left(sExec.indexOf(" "));QProcess *process = new QProcess;process->setWorkingDirectory(path);qDebug() << sExec;process->setProgram(sExec);process->setArguments(QStringList() << filepath);bool b = process->startDetached();qDebug() << b;dialog->close();if (checkBox_default_app->isChecked()) {QString default_apps = QStandardPaths::writableLocation(QStandardPaths::HomeLocation) + "/.config/mimeapps.list";QFile *file = new QFile;file->setFileName(default_apps);QString s="";bool ok = file->open(QIODevice::ReadOnly);if (ok) {QTextStream TS(file);s = TS.readAll();file->close();}file->setFileName(default_apps);ok = file->open(QFile::WriteOnly);if (ok) {QFileInfo FI(desktop);QTextStream TS(file);s.replace(QRegularExpression(MIME + "=.*\n"), MIME + "=" + FI.fileName() + "\n");TS << s;file->close();}}});hbox->addWidget(pushButton_confirm);dialog->show();});

 打开方式过滤：

void MainWindow::openwith_filter(QListWidget *listWidget, QString text, QLabel *label)
{listWidget->clear();QDir dir("/usr/share/applications/");dir.setNameFilters(QStringList() << "*.desktop");if (text != "")dir.setNameFilters(QStringList() << "*" + text + "*");QFileInfoList FIL = dir.entryInfoList();label->setText("其他应用 " + QString::number(FIL.size()));for (int i = 0; i < FIL.size(); i++) {QFileInfo fileInfo = FIL.at(i);QString filepath = fileInfo.absoluteFilePath();QString sname = readSettings(filepath, "Desktop Entry", "Name");QString sicon = readSettings(filepath, "Desktop Entry", "Icon");if (sicon == "")sicon = "applications-system-symbolic";QIcon icon;if (QFileInfo(sicon).isFile()) {icon = QIcon(sicon);} else {icon = QIcon::fromTheme(sicon);}QListWidgetItem *LWI;LWI = new QListWidgetItem(icon, sname);LWI->setData(LOCATION_OF_REAL_PATH, filepath);LWI->setSizeHint(QSize(120,120));listWidget->insertItem(listWidget->count() + 1, LWI);}
};