自定义多选QComboBox

最新推荐文章于 2025-10-03 15:15:36 发布

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#QComBox #复选 #多选

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因项目需求，要实现QComboBox的多选功能。思路是采用QListWidget、QListWidgetItem和QCheckBox。具体实现时，先在Qt designer的UI添加QComboBox控件并提升为自定义控件MutiComboBox，再通过setModelData方式将列表数据传给MutiComboBox。

因项目需求，需要实现QComboBox的多选功能，如下图所示：

思路：QListWidget + QListWidgetItem + QCheckBox

代码如下

#ifndef MUTICOMBOBOX_H
#define MUTICOMBOBOX_H

#include <QWidget>
#include <QListWidget>
#include <QLineEdit>
#include <QComboBox>


class  MutiComboBox : public QComboBox
{
	Q_OBJECT

public:
	MutiComboBox(QWidget *parent = 0);
	MutiComboBox(const QMap<int,QString> &mapData,QWidget *parent = 0);
	~MutiComboBox();

public:
	void setModelData(const QMap<int,QString> &mapData);
	void setCheckedItems(const QString &data);
	QString getSelectedItemDatas();


private slots:
	void stateChanged(int state);
	void textChanged(const QString &text);

private:
	void clear();

private:
	QListWidget *pListWidget;
	QLineEdit *pLineEdit;
	QString strSelectedText;
	bool bSelected;
};

#endif // MUTICOMBOBOX_H

具体实现：

#include "muticombobox.h"

#include <QCheckBox>
#include <QDebug>


MutiComboBox::MutiComboBox(QWidget *parent)
	: QComboBox(parent)
{
	pListWidget = new QListWidget(this);
	pListWidget->setObjectName("MutiComboBoxListWidget");
	pLineEdit = new QLineEdit(this);
	//this->setModel(pListWidget->model());
	//this->setView(pListWidget);
	this->setLineEdit(pLineEdit);
	pLineEdit->setReadOnly(true);
	connect(pLineEdit,SIGNAL(textChanged(const QString &)),this,SLOT(textChanged(const QString &)));
}

MutiComboBox::MutiComboBox(const QMap<int,QString> &mapData,QWidget *parent)
:QComboBox(parent)
{
	pListWidget = new QListWidget(this);
	pLineEdit = new QLineEdit(this);
	QMapIterator<int,QString> it(mapData);
	while(it.hasNext()){
		it.next();
		QListWidgetItem *pItem = new QListWidgetItem(pListWidget);
		pListWidget->addItem(pItem);
		pItem->setData(Qt::UserRole,it.key());
		QCheckBox *pCheckBox = new QCheckBox(this);
		pCheckBox->setText(it.value());
		pListWidget->addItem(pItem);
		pListWidget->setItemWidget(pItem,pCheckBox);
		connect(pCheckBox,SIGNAL(stateChanged(int)),this,SLOT(stateChanged(int)));
	}

	this->setModel(pListWidget->model());
	this->setView(pListWidget);
	this->setLineEdit(pLineEdit);
	pLineEdit->setReadOnly(true);
	connect(pLineEdit,SIGNAL(textChanged(const QString &)),this,SLOT(textChanged(const QString &)));
}

MutiComboBox::~MutiComboBox()
{
	delete pListWidget;
	delete pLineEdit;
}
void MutiComboBox::setModelData(const QMap<int,QString> &mapData)
{
	int count = pListWidget->count();
	for (int row = 0; row < count;++row)
	{
		QListWidgetItem *pItem = pListWidget->takeItem(0);
		delete pItem;
	}
	
	QMapIterator<int,QString> it(mapData);
	while(it.hasNext()){
		it.next();
		QListWidgetItem *pItem = new QListWidgetItem(pListWidget);
		pListWidget->addItem(pItem);
		pItem->setData(Qt::UserRole,it.key());
		QCheckBox *pCheckBox = new QCheckBox(this);
		pCheckBox->setText(it.value());
		pListWidget->addItem(pItem);
		pListWidget->setItemWidget(pItem,pCheckBox);
		connect(pCheckBox,SIGNAL(stateChanged(int)),this,SLOT(stateChanged(int)));
	}
	this->setModel(pListWidget->model());
	this->setView(pListWidget);
}

void MutiComboBox::setCheckedItems(const QString &data)
{
	clear();

	if(data.isEmpty())
		return;

	int count = pListWidget->count();
	QStringList list(data.split(";"));
	QStringListIterator it(list);
	while(it.hasNext())
	{
		QString da = it.next();
		for(int i=0;i<count;++i)
		{
			QListWidgetItem *pItem = pListWidget->item(i);
			if(pItem->data(Qt::UserRole).toString() == da)
			{
				QWidget *pWidget = pListWidget->itemWidget(pItem);
				QCheckBox *pCheckBox = (QCheckBox*) pWidget;
				pCheckBox->setChecked(true);
				break;
			}
		}
	}
}
QString MutiComboBox::getSelectedItemDatas()
{
	int nCount = pListWidget->count();
	QString strSeltectedData("");
	for(int i=0; i < nCount; ++i)
	{
		QListWidgetItem *pItem = pListWidget->item(i);
		QWidget *pWidget = pListWidget->itemWidget(pItem);
		QCheckBox *pCheckBox = (QCheckBox*) pWidget;
		if(pCheckBox->isChecked()){
			QString strText = pItem->data(Qt::UserRole).toString().trimmed();
			strSeltectedData.append(strText).append(";");
		}
	}

	if(strSeltectedData.endsWith(";"))
	{
		strSeltectedData.remove(strSeltectedData.count()-1,1);
	}
	return strSeltectedData;
}


void MutiComboBox::stateChanged(int state)
{
	bSelected = true;
	QString strSelectedData("");
	strSelectedText.clear();
	QObject *object= QObject::sender();
	QCheckBox *pSenderCheckBox = static_cast<QCheckBox*>(object);
	int nCount = pListWidget->count();
	for(int i=0; i < nCount; ++i)
	{
		QListWidgetItem *pItem = pListWidget->item(i);
		QWidget *pWidget = pListWidget->itemWidget(pItem);
		QCheckBox *pCheckBox = (QCheckBox*) pWidget;
		if(pCheckBox->isChecked()){
			QString strText = pCheckBox->text();
			strSelectedData.append(strText).append(";");
		}
	}

	if(strSelectedData.endsWith(";"))
	{
		strSelectedData.remove(strSelectedData.count()-1,1);
	}

	if(!strSelectedData.isEmpty())
	{
		strSelectedText = strSelectedData;
		pLineEdit->setText(strSelectedData);
		pLineEdit->setToolTip(strSelectedData);
	}else{
		pLineEdit->clear();
	}
	bSelected = false;
}

void MutiComboBox::textChanged(const QString &text)
{
	if(!bSelected)
	{
		pLineEdit->setText(strSelectedText);
	}
}

void MutiComboBox::clear(){
	int nCount = pListWidget->count();
	for(int i=0; i < nCount; ++i)
	{
		QListWidgetItem *pItem = pListWidget->item(i);
		QWidget *pWidget = pListWidget->itemWidget(pItem);
		QCheckBox *pCheckBox = (QCheckBox*) pWidget;
		if(pCheckBox->isChecked()){
			pCheckBox->setChecked(false);
		}
	}
	strSelectedText = "";
	pLineEdit->setText("");
}

使用方法：

1.在Qt designer中的UI先添加 QComboBox控件，然后提升该控件为自定义的控件 MutiComboBox

2.通过setModelData的方式，将列表中的数据传给MutiComboBox

如：

ui->cmbRes->setModelData(m_LogictActIDMap);