不知道有没有人在,想请教一个关于QT代码的问题
问题描述:这是书上的部分关键部分代码,我自己添加了一些重要的部分后,试着运行,编译通过,最后生成EXE文件,试着实际运行一下,结果:原本是按“add”键可以在两个输入框内输入文字,并且还有两个隐藏按键会显示出来,但是结果没有达到预期的效果,能否帮我检查一下到底是除了什么问题?谢谢了以下是源代码:
头文件:
#ifndef MYNAME_H_
#define MYNAME_H_
#include <QWidget>
#include <QMap>
class QLineEdit;
class QTextEdit;
class QPushButton;
class QString;
class AddressBook : public QWidget
{
Q_OBJECT
public:
AddressBook(QWidget *parent = 0);
private slots:
void addContact();
void submitContact();
void cancel();
private:
QLineEdit *nameLine;
QTextEdit *addressText;
QPushButton *addButton;
QPushButton *submitButton;
QPushButton *cancelButton;
QMap <QString,QString> contacts;
QString oldName;
QString oldAddress;
};
#endif
类的实现文件:
#include <QtGui>
#include "AddressBook.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);
addButton = new QPushButton(tr("&Add"));
addButton->show();
submitButton = new QPushButton(tr("&Submit"));
submitButton->hide();
cancelButton = new QPushButton(tr("&Cancel"));
cancelButton->hide();
connect(addButton, SIGNAL(cliked()), this, SLOT(addContact()));
connect(submitButton, SIGNAL(cliked()), this, SLOT(submitContact()));
connect(cancelButton, SIGNAL(cliked()), this, SLOT(cancel()));
QGridLayout *mainLayout = new QGridLayout;
mainLayout->addWidget(nameLabel,0,0);
mainLayout->addWidget(nameLine,0,1);
mainLayout->addWidget(addressLabel,1,0,Qt::AlignTop);
mainLayout->addWidget(addressText,1,1);
QVBoxLayout *buttonLayout1 = new QVBoxLayout;
buttonLayout1->addWidget(addButton,Qt::AlignTop);
buttonLayout1->addWidget(submitButton);
buttonLayout1->addWidget(cancelButton);
buttonLayout1->addStretch();
mainLayout->addLayout(buttonLayout1,1,2);
setLayout(mainLayout);
setWindowTitle(tr("Simple Address Book"));
}
void AddressBook::addContact()
{
oldName = nameLine->text();
oldAddress = addressText->toPlainText();
nameLine->clear();
addressText->clear();
nameLine->setReadOnly(false);
nameLine->setFocus(Qt::OtherFocusReason);
addressText->setReadOnly(false);
addButton->setEnabled(false);
submitButton->show();
cancelButton->show();
}
void AddressBook::submitContact()
{
QString name = nameLine->text();
QString address = addressText->toPlainText();
if (name == " "||address == " ")
{
QMessageBox::information(this, tr("Empty Field"), tr("Please enter a name and address."));
return;
}
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));
}
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();
}
main.cpp文件(个人觉得这个文件应该没有问题):
#include <QApplication>
#include "AddressBook.h"
int main(int argc, char *argv[])
{
QApplication app(argc,argv);
AddressBook *addressBook = new AddressBook;
addressBook->show();
return app.exec();
}