QListWidget类也是GUI中常用的类,它从QListView下派生:

class Q_GUI_EXPORT QListWidget : public QListView
{
Q_OBJECT

常用方法和属性:

(1)addItem

void addItem ( const QString & label )
void addItem ( QListWidgetItem * item )
void addItems ( const QStringList & labels )

添加一项或多项。

(2)

int count () const

包含隐藏的列表项在内的列表项总数。

(3)currentItem

QListWidgetItem * currentItem () const

返回当前选择的项。

(4)currentRow

int currentRow () const

返回当前选择的项的序号。

(5)insertItem

void insertItem ( int row, QListWidgetItem * item )
void insertItem ( int row, const QString & label )
void insertItems ( int row, const QStringList & labels )

插入新项到列表框。

(6)

QListWidgetItem * item ( int row ) const

返回序号为row处的列表项。

(7)removeItemWidget

void removeItemWidget ( QListWidgetItem * item )

删除指定项item。

(8)selectedItems

QList<QListWidgetItem *> selectedItems () const

返回当前选择的项。

(9)

void setCurrentItem ( QListWidgetItem * item )

设置当前选择的项为item。

(10)

void setCurrentRow ( int row )

设置当前选择项。

(11)

void setSortingEnabled ( bool enable )

设置排序功能是否启用。

(12)

void sortItems ( Qt::SortOrder order = Qt::AscendingOrder )

排序列表框,参数的值可以是:

Qt::AscendingOrder          0                  The items are sorted ascending e.g. starts with 'AAA' ends with 'ZZZ' in Latin-1 locales
Qt::DescendingOrder       1                  The items are sorted descending e.g. starts with 'ZZZ' ends with 'AAA' in Latin-1 locales
(13)

QListWidgetItem * QListWidget::takeItem ( int row )

删除一项。

示例:

Window.h

#ifndef __WINDOW_H__
#define __WINDOW_H__ #include <QMainWindow>
#include <QPushButton>
#include <QLineEdit>
#include <QLayout>
#include <QLabel>
#include <QComboBox>
#include <QMessageBox>
#include <QDialog>
#include <QListWidget> class Window : public QMainWindow
{
Q_OBJECT public:
Window(QWidget *parent = NULL):QMainWindow(parent)
{ listWidget = new QListWidget(this);
new QListWidgetItem(tr("Oak"), listWidget);
new QListWidgetItem(tr("Fir"), listWidget);
new QListWidgetItem(tr("Pine"), listWidget); QLabel *lbl = new QLabel(tr("select text:"));
edt = new QLineEdit; QVBoxLayout *leftLayout = new QVBoxLayout; leftLayout->addWidget(listWidget);
leftLayout->addWidget(lbl);
leftLayout->addWidget(edt); //
edt_add = new QLineEdit;
QPushButton *add_btn = new QPushButton(tr("Add"));
QPushButton *del_btn = new QPushButton(tr("Del"));
QPushButton *quit_btn = new QPushButton(tr("Quit")); QVBoxLayout *rightLayout = new QVBoxLayout;
rightLayout->addWidget(edt_add);
rightLayout->addWidget(add_btn);
rightLayout->addWidget(del_btn);
rightLayout->addStretch();
rightLayout->addWidget(quit_btn); QHBoxLayout *mainLayout = new QHBoxLayout;
mainLayout->addLayout(leftLayout);
mainLayout->addLayout(rightLayout); QWidget *mainWidget = new QWidget;
mainWidget->setLayout(mainLayout); setCentralWidget(mainWidget); connect(listWidget, SIGNAL(itemSelectionChanged()), this, SLOT(itemSelectionChanged ()));
connect(add_btn, SIGNAL(clicked()), this, SLOT(on_add()));
connect(del_btn, SIGNAL(clicked()), this, SLOT(on_del()));
connect(quit_btn, SIGNAL(clicked()), this, SLOT(close()));
} private:
QListWidget *listWidget;
QLineEdit *edt, *edt_add; private slots:
void itemSelectionChanged()
{
edt->setText(listWidget->currentItem()->text());
} void on_add()
{
listWidget->insertItem(listWidget->currentRow() + 1, edt_add->text());
} void on_del()
{
listWidget->takeItem(listWidget->currentRow());
} }; #endif

main.cpp

#include <QApplication>
#include <QDialog>
#include "Window.h" int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Window *mainWindow = new Window; mainWindow->resize(300, 300);
mainWindow->setWindowTitle(QWidget::tr("Qt Test"));
mainWindow->show(); return a.exec();
}

编译运行,界面如下:

列表框QListWidget类-LMLPHP

QListWidget的项可以是带图片的显示,示例:

    QListWidgetItem *configButton = new QListWidgetItem(contentsWidget);
configButton->setIcon(QIcon(":/images/config.png"));
configButton->setText(tr("Configuration"));
configButton->setTextAlignment(Qt::AlignHCenter);
configButton->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled); QListWidgetItem *updateButton = new QListWidgetItem(contentsWidget);
updateButton->setIcon(QIcon(":/images/update.png"));
updateButton->setText(tr("Update"));
updateButton->setTextAlignment(Qt::AlignHCenter);
updateButton->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled); QListWidgetItem *queryButton = new QListWidgetItem(contentsWidget);
queryButton->setIcon(QIcon(":/images/query.png"));
queryButton->setText(tr("Query"));
queryButton->setTextAlignment(Qt::AlignHCenter);
queryButton->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled);

如图:

列表框QListWidget类-LMLPHP

转自:http://blog.csdn.net/xgbing/article/details/7768226

05-11 11:30
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