multilist.h
#ifndef MULTILIST
#define MULTILIST
#include <QtWidgets>
class MultiList : public QComboBox {
Q_OBJECT
private:
QString displayText;
QStandardItemModel *model;
public:
MultiList(QWidget *parent = 0) : QComboBox(parent) {
setEditable(true);
displayText = "";
model = new QStandardItemModel;
slotUpdateText();
connect(model, SIGNAL(itemChanged(QStandardItem*)), this, SLOT(slotUpdate()));
}
void addItem(const QString &text) {
int row = model->rowCount();
QStandardItem* item = new QStandardItem();
item->setText(text);
item->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled);
item->setData(Qt::Unchecked, Qt::CheckStateRole);
model->setItem(row, 0, item);
this->setModel(model);
}
void addItems(const QStringList &texts) {
for (int i = 0; i < texts.count(); i++) {
addItem(texts.at(i));
}
}
QStringList getCheckedItems() const {
QStringList checkedItems;
for (int i = 0; i < model->rowCount(); i++) {
if (model->item(i, 0)->checkState() == Qt::Checked) {
checkedItems << model->item(i, 0)->text();
}
}
return checkedItems;
}
void setCheckedItems(const QStringList &items) {
for (int i = 0; i < items.count(); i++) {
int index = findText(items.at(i));
if (index != -1) {
model->item(index)->setData(Qt::Checked, Qt::CheckStateRole);
}
}
slotUpdate();
}
public slots:
void slotUpdateText() {
lineEdit()->setText(displayText);
}
void slotUpdate() {
displayText = "";
for (int i = 0; i < model->rowCount(); i++) {
if (model->item(i, 0)->checkState() == Qt::Checked) {
displayText = displayText + model->item(i, 0)->text() + "; ";
}
}
QTimer::singleShot(0, this, SLOT(slotUpdateText()));
}
};
#endif
main.cpp
#include "multilist.h"
int main(int argc, char** argv) {
QApplication app(argc, argv);
MultiList *multiList = new MultiList();
multiList->addItems(QStringList() << "One" << "Two" << "Three" << "Four");
multiList->setCheckedItems(QStringList() << "One" << "Two");
QHBoxLayout *layout = new QHBoxLayout();
layout->addWidget(new QLabel("Select items:"));
layout->addWidget(multiList, 1);
QWidget widget;
widget.setWindowTitle("MultiList example");
widget.setLayout(layout);
widget.show();
return app.exec();
}
