QComboBox类详解

#include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); addItemFunction(); connect(ui->pBtn_add,&QPushButton::clicked,this,&MainWindow::addSingleItemSlot); connect(ui->pBtn_remove,&QPushButton::clicked,this,&MainWindow::removeItemSlot); connect(ui->pBtn_insert,&QPushButton::clicked,this,&MainWindow::insertItemSlot); connect(ui->pBtn_clear,&QPushButton::clicked,this,&MainWindow::clearSlot); connect(ui->pBtn_count,&QPushButton::clicked,this,&MainWindow::getCountSlot); connect(ui->comboBox,SIGNAL(activated(int)),this,SLOT(currentItemSlot(int))); } MainWindow::~MainWindow() { delete ui; } /** * @brief MainWindow::addItemFunction 添加条目 */ void MainWindow::addItemFunction() { ui->comboBox->addItem("Item 1"); ui->comboBox->addItem(QStringLiteral("条目2")); QStringList items; items <<"Item 3"<< QStringLiteral("条目4"); ui->comboBox->addItems(items); //ui->comboBox->addItem(QIcon("./icon/icom_item.png"),QStringLiteral("图标条目5")); } /** * @brief MainWindow::addItemSlot手动添加条目 */ void MainWindow::addSingleItemSlot() { QString m_text = ui->lineEdit_addItemtext->text(); ui->comboBox->addItem(m_text); ui->textEdit_showInfo->setText(QStringLiteral("添加一个文本为")+m_text+QStringLiteral("条目")); } /** * @brief MainWindow::removeItemSlot手动移除条目 */ void MainWindow::removeItemSlot() { int index = ui->lineEdit_removeItemindex->text().toInt(); int itemCount = ui->comboBox->count(); if(index < -1 || index > (itemCount-1)) { ui->textEdit_showInfo->setText(QStringLiteral("删除的条目索引超过目前索引值")); return; } ui->comboBox->removeItem(index); ui->textEdit_showInfo->setText(QString::fromLocal8Bit("删除索引为%1条目").arg(index)); return; } /** * @brief MainWindow::insertItemSlot手动插入条目 */ void MainWindow::insertItemSlot() { int index = ui->lineEdit_insertItemindex->text().toInt(); QString m_text = ui->lineEdit_insertItemtext->text(); int itemCount = ui->comboBox->count(); if(index < -1 || index > itemCount) { ui->textEdit_showInfo->setText(QStringLiteral("插入的条目索引超过目前索引值")); return; } ui->comboBox->insertItem(index,m_text); ui->textEdit_showInfo->setText(QString::fromLocal8Bit("在索引为%1").arg(index) +QStringLiteral("后插入一个条目文本为")+m_text); } void MainWindow::clearSlot() { ui->comboBox->clear(); ui->textEdit_showInfo->setText(QString::fromLocal8Bit("清空所有条目")); } void MainWindow::getCountSlot() { int itemCount = ui->comboBox->count(); ui->textEdit_showInfo->setText(QString::fromLocal8Bit("当前条目数量为%1").arg(itemCount)); } void MainWindow::currentItemSlot(int index) { QString m_text = ui->comboBox->itemText(index); ui->textEdit_showInfo->setText(QString::fromLocal8Bit("当前条目文本为")+m_text); }