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本文转载自:http://blog.csdn.net/xgbing/article/details/7768226
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:
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:
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