Qt5开发及实例-CH1601.rar,Qt5用PieView控件实现汽车销售系统例程代码

#include "widget.h" #include "ui_widget.h" #include "connection.h" #include <QtWidgets> #include "pieview.h" Widget::Widget(QWidget *parent) : QMainWindow(parent), ui(new Ui::Widget) { ui->setupUi(this); setFixedSize(750,500); createMenuBar(); ui->stackedWidget->setCurrentIndex(0); QSqlQueryModel *factoryModel = new QSqlQueryModel(this); factoryModel->setQuery("select name from factory"); ui->sellFactoryComboBox->setModel(factoryModel); QSplitter *splitter = new QSplitter(ui->managePage); splitter->resize(700,360); splitter->move(0,50); splitter->addWidget(ui->toolBox); splitter->addWidget(ui->dailyList); splitter->setStretchFactor(0,1); splitter->setStretchFactor(1,1); on_sellCancelBtn_clicked(); showDailyList(); ui->factoryComboBox->setModel(factoryModel); createChartModelView(); } Widget::~Widget() { delete ui; } void Widget::on_sellBrandComboBox_currentIndexChanged(const QString &arg1) { ui->sellNumSpinBox->setValue(0); ui->sellNumSpinBox->setEnabled(false); ui->sellSumLineEdit->clear(); ui->sellSumLineEdit->setEnabled(false); ui->sellOkBtn->setEnabled(false); QSqlQuery query; query.exec(QString("select price from brand where name='%1' and factory='%2'").arg(arg1).arg(ui->sellFactoryComboBox->currentText())); query.next(); ui->sellPriceLineEdit->setEnabled(true); ui->sellPriceLineEdit->setReadOnly(true); ui->sellPriceLineEdit->setText(query.value(0).toString()); query.exec(QString("select last from brand where name='%1' and factory='%2'").arg(arg1).arg(ui->sellFactoryComboBox->currentText())); query.next(); int num = query.value(0).toInt(); if(num == 0){ QMessageBox::information(this,tr("提示"),tr("该品牌汽车已经售完！"),QMessageBox::Ok); } else{ ui->sellNumSpinBox->setEnabled(true); ui->sellNumSpinBox->setMaximum(num); ui->sellLastNumLabel->setText(tr("剩余数量：%1").arg(num)); ui->sellLastNumLabel->setVisible(true); } } void Widget::on_sellNumSpinBox_valueChanged(int arg1) { if(arg1 == 0){ ui->sellSumLineEdit->clear(); ui->sellSumLineEdit->setEnabled(false); ui->sellOkBtn->setEnabled(false); } else{ ui->sellSumLineEdit->setEnabled(true); ui->sellSumLineEdit->setReadOnly(true); qreal sum = arg1*ui->sellPriceLineEdit->text().toInt(); ui->sellSumLineEdit->setText(QString::number(sum)); ui->sellOkBtn->setEnabled(true); } } void Widget::on_sellCancelBtn_clicked() { ui->sellFactoryComboBox->setCurrentIndex(0); ui->sellBrandComboBox->clear(); } void Widget::on_sellOkBtn_clicked() { QString factory = ui->sellFactoryComboBox->currentText(); QString name = ui->sellBrandComboBox->currentText(); int value = ui->sellNumSpinBox->value(); //sellNumSpinBox 的最大值就是以前的剩余量 int last = ui->sellNumSpinBox->maximum()-value; QSqlQuery query; //获取以前的销售量 query.exec(QString("select sell from brand where name='%1' and factory='%2'").arg(name).arg(factory)); query.next(); int sell = query.value(0).toInt() + value; //事务操作 QSqlDatabase::database().transaction(); bool rtn = query.exec(QString("update brand set sell= %1,last= %2 where name='%3' and factory='%4'").arg(sell).arg(last).arg(name).arg(factory)); if(rtn){ QSqlDatabase::database().commit(); QMessageBox::information(this,tr("提示"),tr("购车成功！"),QMessageBox::Ok); writeXml(); showDailyList(); on_sellCancelBtn_clicked(); } else{ QSqlDatabase::database().rollback(); } } QString Widget::getDateTime(DateTimeType type) { QDateTime datetime = QDateTime::currentDateTime(); QString date = datetime.toString("yyyy-MM-dd"); QString time = datetime.toString("hh:mm"); QString dateAndTime = datetime.toString("yyyy-MM-dd dddd hh:mm"); if(type == Date)return date; else if(type == Time)return time; else return dateAndTime; } //读取 XML 文档 bool Widget::docRead() { QFile file("data.xml"); if(!file.open(QIODevice::ReadOnly)) return false; if(!doc.setContent(&file)){ file.close(); return false; } file.close(); return true; } //写入 XML 文档 bool Widget::docWrite() { QFile file("data.xml"); if(!file.open(QIODevice::WriteOnly|QIODevice::Truncate)) return false; QTextStream out(&file); doc.save(out,4); file.close(); return true; } //将销售车辆信息保存到 XML 文件中 void Widget::writeXml() { //先从文件读取 if(docRead()){ QString currentDate = getDateTime(Date); QDomElement root = doc.documentElement(); //根据是否有日期节点进行处理 if(!root.hasChildNodes()){ QDomElement date = doc.createElement(QString("日期")); QDomAttr curDate = doc.createAttribute("date"); curDate.setValue(currentDate); date.setAttributeNode(curDate); root.appendChild(date); createNodes(date); }else{ QDomElement date = root.lastChild().toElement(); //根据是否已经有今天的日期节点进行处理 if(date.attribute("date") == currentDate){ createNodes(date); }else{ QDomElement date = doc.createElement(QString("日期")); QDomAttr curDate = doc.createAttribute("date"); curDate.setValue(currentDate); date.setAttributeNode(curDate); root.appendChild(date); createNodes(date); } } //写入到文件 docWrite(); } } //创建销售车辆信息的节点 void Widget::createNodes(QDomElement &date) { QDomElement time = doc.createElement(QString("时间")); QDomAttr curTime = doc.createAttribute("time"); curTime.setValue(getDateTime(Time)); time.setAttributeNode(curTime); date.appendChild(time); QDomElement factory = doc.createElement(QString("厂家")); QDomElement brand = doc.createElement(QString("品牌")); QDomElement price = doc.createElement(QString("报价")); QDomElement num = doc.createElement(QString("数量")); QDomElement sum = doc.createElement(QString("金额")); QDomText text; text = doc.createTextNode(QString("%1").arg(ui->sellFactoryComboBox->currentText())); factory.appendChild(text); text = doc.createTextNode(QString("%1").arg(ui->sellBrandComboBox->currentText())); brand.appendChild(text); text = doc.createTextNode(QString("%1").arg(ui->sellPriceLineEdit->text())); price.appendChild(text); text = doc.createTextNode(QString("%1").arg(ui->sellNumSpinBox->value())); num.appendChild(text); text = doc.createTextNode(QString("%1").arg(ui->sellSumLineEdit->text())); sum.appendChild(text); time.appendChild(factory); time.appendChild(brand); time.appendChild(price); time.appendChild(num); time.appendChild(sum); } //显示日销售清单 void Widget::showDailyList() { ui->dailyList->clear(); if(docRead()){ QDomElement root = doc.documentElement(); QString title = root.tagName(); QListWidgetItem *titleItem = new QListWidgetItem; titleItem->setText(QString("-----%1-----").arg(title)); titleItem->setTextAlignment(Qt::AlignCenter); ui->dailyList->addItem(titleItem); if(root.hasChildNodes()){ QString currentDate = getDateTime(Date); QDomElement dateElement = root.lastChild().toElement();