Qt 的简单示例 -- 地址簿

这个工程里有两个窗口，都是QWidget派生的窗口
主窗口：
1. 运用了布局，按钮控件，单行编辑框，富文本编辑框等窗口部件；
2. 运用了 QMap 类；
3. 实现了点击按钮弹出子窗口的功能，这里子窗口设置为了模态窗口
   这样窗口弹出后会阻塞父窗口；
子窗口：
1. 子窗口定义时接收传递进来的QMap的参数对自己的 QMap 变量进行初始化
2. 运用了窗口部件 QTableWidget

/** addressbook.h 文件 **/#ifndef ADDRESSBOOK_H
#define ADDRESSBOOK_H#include <QWidget>
#include <QLineEdit>
#include <QTextEdit>
#include <QLabel>
#include <QGridLayout>
#include <QVBoxLayout>
#include <QPushButton>
#include <QMessageBox>class AddressBook : public QWidget
{Q_OBJECT
public:explicit AddressBook(QWidget *parent = nullptr);private:QLineEdit *nameLine;QTextEdit *addressText;QPushButton *showButton;QPushButton *addButton;QPushButton *submitButton;QPushButton *cancelButton;QMap<QString,QString>contacts;  //键值对QString oldName;QString oldAddress;signals:public slots:void addContact();void submitContact();void cancel();void showList();
};#endif // ADDRESSBOOK_H

/** addressbook.cpp **/#include "addressbook.h"
#include "addresslist.h"AddressBook::AddressBook(QWidget *parent) : QWidget(parent)
{QLabel *nameLabel = new QLabel(tr("Name:"));nameLine = new QLineEdit;nameLine->setReadOnly(true);QLabel *addressLabel = new QLabel(tr("Address:"));addressText = new QTextEdit;addressText->setReadOnly(true);showButton= new QPushButton(tr("Show"));//网格布局QGridLayout *mainLayout = new QGridLayout;mainLayout->addWidget(nameLabel,0,0);mainLayout->addWidget(nameLine,0,1);mainLayout->addWidget(showButton,0,2);mainLayout->addWidget(addressLabel,1,0,Qt::AlignTop);mainLayout->addWidget(addressText,1,1);//定义按钮addButton = new QPushButton(tr("&Add"));addButton->show();submitButton = new QPushButton(tr("&Submit"));submitButton->hide();cancelButton = new QPushButton(tr("&Cancel"));cancelButton->hide();//给按钮的点击信号添加槽函数connect(addButton,SIGNAL(clicked()),this,SLOT(addContact()));connect(submitButton,SIGNAL(clicked()),this,SLOT(submitContact()));connect(cancelButton,SIGNAL(clicked()),this,SLOT(cancel()));connect(showButton,SIGNAL(clicked()),this,SLOT(showList()));//按钮添加到布局QVBoxLayout *buttonLayout=new QVBoxLayout;buttonLayout->addWidget(addButton,Qt::AlignTop);buttonLayout->addWidget(submitButton);buttonLayout->addWidget(cancelButton);buttonLayout->addStretch();//添加拉伸，可以使部件排列紧密些//将按钮布局添加到主布局中mainLayout->addLayout(buttonLayout,1,2);setLayout(mainLayout);setWindowTitle(tr("Simple Address Book"));}//按钮相关槽函数实现
void AddressBook::addContact(){//先记录最后一个通讯录oldName = nameLine->text();oldAddress = addressText->toPlainText(); //转换为纯文本//情况显示nameLine->clear();addressText->clear();nameLine->setReadOnly(false);nameLine->setFocus(Qt::OtherFocusReason);  //控件设置焦点addressText->setReadOnly(false);addButton->setEnabled(false); // 按钮设置为不可点submitButton->show();cancelButton->show();}void AddressBook::submitContact(){QString name = nameLine->text();QString address = addressText->toPlainText();//判断是否为空if(name == "" || address == ""){QMessageBox::information(this,tr("Empty Field"),tr("Please enter a name and address."));return;}//判断联系人是否已存在if(!contacts.contains(name)){contacts.insert(name,address);QMessageBox::information(this,tr("Add Successful."),tr("\"%1\"has been added to your address book.").arg(name));}else {QMessageBox::information(this,tr("Add Unsuccessful!"),tr("Sorry,\"%1\"has been added to your address book.").arg(name));return;}//如果列表是空if(contacts.isEmpty()){nameLine->clear();addressText->clear();}nameLine->setReadOnly(true);addressText->setReadOnly(true);addButton->setEnabled(true);submitButton->hide();cancelButton->hide();}void AddressBook::cancel(){nameLine->setText(oldName);nameLine->setReadOnly(true);addressText->setText(oldAddress);addressText->setReadOnly(true);addButton->setEnabled(true);submitButton->hide();cancelButton->hide();}void AddressBook::showList(){AddressList *addrlist = new AddressList(contacts);addrlist->setWindowModality(Qt::ApplicationModal);addrlist->show();addrlist->setAttribute(Qt::WA_DeleteOnClose);
}

/** addresslist.cpp **/#include "addresslist.h"AddressList::AddressList(const QMap<QString, QString> &initMap,QWidget *parent): QWidget(parent),addressMap(initMap)
{addressList = new QTableWidget(100,3);addressList->setHorizontalHeaderLabels({"number","name","address"});QVBoxLayout *mainLayout = new QVBoxLayout;setLayout(mainLayout);mainLayout->addWidget(addressList,Qt::AlignCenter);showAddressList();setWindowTitle(tr("Address List"));}void AddressList::showAddressList(){int i=0;for(auto it = addressMap.begin();it != addressMap.end();++it){addressList->setItem(i,0,new QTableWidgetItem(tr("%1").arg(i+1)));addressList->setItem(i,1,new QTableWidgetItem(it.key()));addressList->setItem(i,2,new QTableWidgetItem(it.value()));i++;}
}

/** main.cpp **/
#include "addressbook.h"
#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);AddressBook addressBook;addressBook.show();return a.exec();
}