QPushButton和QListView实现自定义QcomboBox功能（可以自由定义下拉框位置）

#include "pushcombox.h" #include <QVBoxLayout> #include <QDebug> #include <QDesktopWidget> #include <QListView> pushcombox::pushcombox(QWidget *widget) : QPushButton(widget) { m_currindex=0; m_currenttext="---"; listPanel=new QWidget(widget); listview=new QListView; listview->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); QVBoxLayout *layout=new QVBoxLayout; layout->addWidget(listview); layout->setContentsMargins(0,0,0,0); listPanel->setLayout(layout); model=new QStringListModel; listview->setModel(model); listview->setEditTriggers(QAbstractItemView::NoEditTriggers); listPanel->hide(); connect(listview,SIGNAL(clicked(QModelIndex)),SLOT(on_clicked())); connect(this,SIGNAL(clicked(bool)),this,SLOT(on_showPopup())); } void pushcombox::addtextItem(QString str) { QStringList list; list=model->stringList(); list+=str; model->setStringList(list); this->setText(list.at(m_currindex)); } void pushcombox::on_clicked() { qDebug()<<"on_clicked"; QStringList list; list=model->stringList(); this->setText(list.at(listview->currentIndex().row())); setCurrentIndex(listview->currentIndex().row()); setCurrentText(list.at(listview->currentIndex().row())); listPanel->hide(); } void pushcombox::on_showPopup() { qDebug()<<"on_showPopup"; if(!listPanel->isHidden()) { listPanel->hide(); return; } int height=20*listview->model()->rowCount(); //if(height>window()->height()-this->y()) //height=this->y(); listPanel->resize(this->width(),height); listPanel->move(this->x(),this->y() + this->height()); listPanel->show(); } void pushcombox::addtextItems(QStringList list) { model->setStringList(list); this->setText(list.at(m_currindex)); } void pushcombox::setCurrentIndex(int i) { if(i==m_currindex) return; m_currindex=i; QStringList list; list=model->stringList(); this->setText(list.at(m_currindex)); emit currentIndexChanged(m_currindex); } void pushcombox::setCurrentText(QString str) { if(str==m_currenttext) return; m_currenttext=str; emit currentTextChanged(m_currenttext); }