学习了上一条博客的关于QListWidget的成员函数的用法，下面就有一个相关的简单小程序来练下手:
程序完成如下图:

第一步，我们先通过ui设计师拖拽出我们想要的布局:

下面是”c.cpp”下的代码:我将逐句讲解:

#include"c.h"c::c(QWidget*parent):QMainWindow(parent){//应用ui设计师布局.ui.setupUi(this);//把两个按钮设置为选中.ui.listButton->setChecked(true);ui.upButton->setChecked(true);//列表部件采用排序.默认采用AAA-ZZZ排序.ui.listWidget->setSortingEnabled(true);//往列表部件中加入项组.一共3个.ui.listWidget->addItems(QStringList()<<QString::fromLocal8Bit("北京")<<QString::fromLocal8Bit("上海")<<QString::fromLocal8Bit("杭州"));//设置标题为"QListWidget".this->setWindowTitle(QString::fromLocal8Bit("QListWidget"));//对于前面的三个项设置图标.可根据实际情况使用.ui.listWidget->item(0)->setIcon(QIcon("Icons/1.jpg"));ui.listWidget->item(1)->setIcon(QIcon("Icons/2.jpg"));ui.listWidget->item(2)->setIcon(QIcon("Icons/3.png"));//设置项的选择情况.ui.listWidget->setSelectionMode(QAbstractItemView::ExtendedSelection);//连接信号与槽.connect(ui.addButton,SIGNAL(clicked()),this,SLOT(addItemSlot()));connect(ui.delButton,SIGNAL(clicked()),this,SLOT(delItemSlot()));connect(ui.delAllButton,SIGNAL(clicked()),this,SLOT(delAllItemSlot()));//QLineEdit的信号:voidreturnPressed()的意思是:当焦点在lineEdit内时，敲击enter键，发出信号.connect(ui.lineEdit,SIGNAL(returnPressed()),this,SLOT(addItemSlot()));connect(ui.listButton,SIGNAL(clicked()),this,SLOT(changeListWidgetViewModeSlot()));connect(ui.iconButton,SIGNAL(clicked()),this,SLOT(changeListWidgetViewModeSlot()));connect(ui.upButton,SIGNAL(clicked()),this,SLOT(changeSortModeSlot()));connect(ui.downButton,SIGNAL(clicked()),this,SLOT(changeSortModeSlot()));}c::~c(){}voidc::addItemSlot(){//创建一个QListWidget的项.QListWidgetItem*ite=newQListWidgetItem;//从lineEdit行编辑框中获取输入的文字.QStringiteText=ui.lineEdit->text();//一定要检查是否空，否则也会输入进去!!!if(iteText.isEmpty())return;//然后设置项的文本.ite->setText(iteText);//最后把这个项加入到列表部件中去.ui.listWidget->addItem(ite);//清空行编辑器，坐下善后工作.ui.lineEdit->clear();}voidc::delItemSlot(){//直接使用QListWidget部件的删除函数，通过currentItem()成员函数来获取当前的选择项.ui.listWidget->removeItemWidget(ui.listWidget->currentItem());}voidc::delAllItemSlot(){/*//通过循环一个个删除QListWidget内的项.intcount=ui.listWidget->count();for(inti=count-1;i>=0;--i){QListWidgetItem*ite=ui.listWidget->takeItem(i);if(ite!=0)deleteite;}*///也可以直接:ui.listWidget->clear();}voidc::changeListWidgetViewModeSlot(){//判断对于列表显示模式的选择情况.如果选择了列表模式，则设置列表模式.if(ui.listButton->isChecked()){ui.listWidget->setViewMode(QListView::ListMode);}//否则选择图标模式.else{ui.listWidget->setViewMode(QListView::IconMode);}}voidc::changeSortModeSlot(){//判断循环模式的选择情况.if(ui.upButton->isChecked()){ui.listWidget->sortItems(Qt::AscendingOrder);}else{ui.listWidget->sortItems(Qt::DescendingOrder);}}123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899

最后贴下”c.h”下的代码:

#ifndefC_H#defineC_H#include<QtWidgets/QMainWindow>#include"ui_c.h"#include<QListWidget>#include<QListWidgetItem>#include<QMessageBox>classc:publicQMainWindow{Q_OBJECTpublic:c(QWidget*parent=0);~c();privateslots:voidaddItemSlot();voiddelItemSlot();voiddelAllItemSlot();voidchangeListWidgetViewModeSlot();voidchangeSortModeSlot();private:Ui::cClassui;};#endif//C_H1234567891011121314151617181920212223242526272829

main.cpp下的代码:

#include"c.h"#include<QtWidgets/QApplication>intmain(intargc,char*argv[]){QApplicationa(argc,argv);cw;w.show();returna.exec();}