窗体部件之QComboBox

QComboBox的样式表设定：

给QComboBox添加项两种方式：

widget.cpp

#include "widget.h"#include "ui_widget.h"#include <QListView>#include <QDebug>#include <QMessageBox>#include "accountitem.h"#include "itemdelegate.h"Widget::Widget(QWidget *parent) :    QWidget(parent),    ui(new Ui::Widget){    ui->setupUi(this);    createComboBoxItem();}Widget::~Widget(){    delete ui;}void Widget::createComboBoxItem(){//    //方法一：使用comboBox的addItem方法，并且可以配合使用setItemDelegate委托方法进行重绘    ui->comboBox->addItem("1");    ui->comboBox->addItem("2");    ui->comboBox->addItem("3");    ui->comboBox->addItem("4");    ui->comboBox->addItem("5");    ItemDelegate *pDelegate = new ItemDelegate(this);    ui->comboBox->setItemDelegate(pDelegate);    connect(pDelegate, SIGNAL(deleteItem(QModelIndex)), this, SLOT(deleteItemSlot(QModelIndex)));//    //方法二：使用QListWidget的setItemWidget设置ComboBox自定义代理组件//    listWidget = new QListWidget(this);//    ui->comboBox->setModel(listWidget->model());//    ui->comboBox->setView(listWidget);//    for(int i = 0; i < 3; i++)//    {//        AccountItem *accountItem = new AccountItem(this);//        accountItem->setAccountNumber(QString("I'm ") + QString::number(i, 10));//        QListWidgetItem *listWidgetItem = new QListWidgetItem(listWidget);//        listWidget->setItemWidget(listWidgetItem, accountItem);//    }}void Widget::deleteItemSlot(QModelIndex index){    if (QMessageBox::question(this, QStringLiteral("提示"), QStringLiteral("确认要删除所选账号吗？"), QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes) == QMessageBox::Yes)    {        ui->comboBox->removeItem(index.row());    }}

itemdelegate.cpp

#include "itemdelegate.h"#include <QEvent>#include <QMouseEvent>#include <QPainter>#include <QApplication>#include <QToolTip>ItemDelegate::ItemDelegate(QObject * parent)    : QStyledItemDelegate(parent){}void ItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const{    QStyleOptionViewItem  viewOption(option);    if (viewOption.state & QStyle::State_HasFocus)    {        viewOption.state = viewOption.state ^ QStyle::State_HasFocus;    }    QStyledItemDelegate::paint(painter, viewOption, index);    int height = viewOption.rect.height();    QPixmap pixmap = QPixmap(":/images/delete.png");    QRect decorationRect = QRect(viewOption.rect.left() + viewOption.rect.width() - height, viewOption.rect.top() , height, height);    painter->drawPixmap(decorationRect, pixmap);}bool ItemDelegate::editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index){    int height = option.rect.height() - 4;    QRect decorationRect = QRect(option.rect.left() + option.rect.width() - height, option.rect.top() , height, height);    QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(event);    if (event->type() == QEvent::MouseButtonPress && decorationRect.contains(mouseEvent->pos()))    {        emit deleteItem(index);    }    if (event->type() == QEvent::MouseMove && decorationRect.contains(mouseEvent->pos()))    {        QCursor cursor(Qt::PointingHandCursor);        QApplication::setOverrideCursor(cursor);        QString strText = QStringLiteral("删除账号信息");        QToolTip::showText(mouseEvent->globalPos(), strText);//        QToolTip::showText(mouseEvent->globalPos(), strText, 0, QRect(), 500);    }    else    {        QCursor cursor(Qt::ArrowCursor);        QApplication::setOverrideCursor(cursor);        QToolTip::showText(mouseEvent->globalPos(), "");    }    return QStyledItemDelegate::editorEvent(event, model, option, index);}