宝安关于网站建设,网页设计教程ui,惠州做网站优化,宿迁网站建设哪家最好1.在注册登录的练习里面#xff0c;追加一个QListWidget项目列表 要求:点击注册之后#xff0c;将账号显示到列表窗口小部件上面去 以及#xff0c;在列表窗口小部件中双击某个账号的时候#xff0c;将该账号删除
头文件
#ifndef WIDGET_H
#define WIDGET_H
#include 追加一个QListWidget项目列表 要求:点击注册之后将账号显示到列表窗口小部件上面去 以及在列表窗口小部件中双击某个账号的时候将该账号删除
头文件
#ifndef WIDGET_H
#define WIDGET_H
#include QListWidgetItem
#include QWidget
#include QFile
QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent nullptr);~Widget();void save_data(const QString filename,const QString data);QString load_Data(const QString filename);//从filename文件中加载数据并以返回值返回
private slots:void on_lineEdit_2_textChanged(const QString arg1);void on_lineEdit_textChanged(const QString arg1);void on_pushButton_3_pressed();void on_pushButton_3_released();void on_checkBox_stateChanged(int state);void on_pushButton_2_clicked();void on_listWidget_itemDoubleClicked(QListWidgetItem *item);private:Ui::Widget *ui;QFile file;
};
#endif // WIDGET_H源文件
#include widget.h
#include ui_widget.hWidget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui-setupUi(this);//记住账号QString name load_Data(D:/name.txt);ui-lineEdit_2-setText(name);//判断上次退出前勾选的状态QString ischecked load_Data(D:/ischeck.txt);if(ischecked1)//已经勾选{ui-checkBox-setChecked(1);//进入勾选状态}//记住密码if(ui-checkBox-isChecked())//是勾选状态{QString pswd load_Data(D:/pswd.txt);ui-lineEdit-setText(pswd);}
}Widget::~Widget()
{QString name ui-lineEdit_2-text();//记住账号save_data(D:/name.txt,name);QString pswd ui-lineEdit-text();//记住密码save_data(D:/pswd.txt,pswd);delete ui;
}void Widget::save_data(const QString filename, const QString data)
{file.setFileName(filename);//设定文件名file.open(QFile::WriteOnly);//选择打开模式并打开file.write(data.toLocal8Bit());//把Qstring转换为QbyteArrayfile.close();
}QString Widget::load_Data(const QString filename)
{file.setFileName(filename);file.open(QFile::ReadOnly);QByteArray arr file.readAll();QString str QString::fromLocal8Bit(arr);//把QbyteArray转换为Qstringfile.close();return str;
}//账号编辑器发生改变时触发的槽函数
void Widget::on_lineEdit_2_textChanged(const QString arg1)
{QString name ui-lineEdit-text();QString pswd ui-lineEdit_2-text();if(name.isEmpty()||pswd.isEmpty())//判断账号和密码是否有空的{ui-pushButton-setEnabled(0);//按钮不可按ui-pushButton_2-setEnabled(0);}else{ui-pushButton-setEnabled(1);//按钮可按ui-pushButton_2-setEnabled(1);}
}
//密码编辑器发生改变时触发的槽函数
void Widget::on_lineEdit_textChanged(const QString arg1)
{QString name ui-lineEdit-text();QString pswd ui-lineEdit_2-text();if(name.isEmpty()||pswd.isEmpty()){ui-pushButton-setEnabled(0);ui-pushButton_2-setEnabled(0);}else{ui-pushButton-setEnabled(1);ui-pushButton_2-setEnabled(1);}
}
//显示密码按钮按下
void Widget::on_pushButton_3_pressed()
{ui-lineEdit-setEchoMode(QLineEdit::Normal);//显示密码
}
//显示密码按钮抬起来
void Widget::on_pushButton_3_released()
{ui-lineEdit-setEchoMode(QLineEdit::Password);//隐藏密码
}void Widget::on_checkBox_stateChanged(int state)
{if(state0)//未勾选{save_data(D:/ischeck.txt,0);}else{//勾选save_data(D:/ischeck.txt,1);}
}void Widget::on_pushButton_2_clicked()
{QString name ui-lineEdit_2-text();//获取当前账号文本QString base load_Data(D:/name.txt);//获取文件内账号文本if(name!base){save_data(D:/name.txt,name);QString str load_Data(D:/name.txt);ui-listWidget-addItem(str);//添加到Listwidget中}else{}
}void Widget::on_listWidget_itemDoubleClicked(QListWidgetItem *item)
{ui-listWidget-clear();
}测试文件
#include widget.h#include QApplicationint main(int argc, char *argv[])
{QApplication a(argc, argv);Widget w;w.show();return a.exec();
}2.完成一个计算器ui界面如下 完成-*/计算功能并且在对应位置显示对应的数据
头文件
#ifndef WIDGET_H
#define WIDGET_H#include QWidgetQT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent nullptr);~Widget();private slots:void on_pushButton_9_clicked();void on_pushButton_10_clicked();void on_pushButton_11_clicked();void on_pushButton_5_clicked();void on_pushButton_6_clicked();void on_pushButton_7_clicked();void on_pushButton_clicked();void on_pushButton_2_clicked();void on_pushButton_3_clicked();void on_pushButton_14_clicked();void on_pushButton_16_clicked();void on_pushButton_12_clicked();void on_pushButton_8_clicked();void on_pushButton_4_clicked();void on_pushButton_15_clicked();void on_pushButton_13_clicked();private:Ui::Widget *ui;bool flag;QString symbol;
};
#endif // WIDGET_H
源文件
#include widget.h
#include ui_widget.hWidget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui-setupUi(this);
}Widget::~Widget()
{delete ui;
}//数值按钮
void Widget::on_pushButton_9_clicked()
{if(flag 0){QString str ui-lineEdit-text();ui-lineEdit-setText(str1);}else{QString str ui-lineEdit_2-text();ui-lineEdit_2-setText(str1);}
}void Widget::on_pushButton_10_clicked()
{if(flag 0){QString str ui-lineEdit-text();ui-lineEdit-setText(str2);}else{QString str ui-lineEdit_2-text();ui-lineEdit_2-setText(str2);}
}void Widget::on_pushButton_11_clicked()
{if(flag 0){QString str ui-lineEdit-text();ui-lineEdit-setText(str3);}else{QString str ui-lineEdit_2-text();ui-lineEdit_2-setText(str3);}
}void Widget::on_pushButton_5_clicked()
{if(flag 0){QString str ui-lineEdit-text();ui-lineEdit-setText(str4);}else{QString str ui-lineEdit_2-text();ui-lineEdit_2-setText(str4);}
}void Widget::on_pushButton_6_clicked()
{if(flag 0){QString str ui-lineEdit-text();ui-lineEdit-setText(str5);}else{QString str ui-lineEdit_2-text();ui-lineEdit_2-setText(str5);}
}void Widget::on_pushButton_7_clicked()
{if(flag 0){QString str ui-lineEdit-text();ui-lineEdit-setText(str6);}else{QString str ui-lineEdit_2-text();ui-lineEdit_2-setText(str6);}
}void Widget::on_pushButton_clicked()
{if(flag 0){QString str ui-lineEdit-text();ui-lineEdit-setText(str7);}else{QString str ui-lineEdit_2-text();ui-lineEdit_2-setText(str7);}
}void Widget::on_pushButton_2_clicked()
{if(flag 0){QString str ui-lineEdit-text();ui-lineEdit-setText(str8);}else{QString str ui-lineEdit_2-text();ui-lineEdit_2-setText(str8);}
}void Widget::on_pushButton_3_clicked()
{if(flag 0){QString str ui-lineEdit-text();ui-lineEdit-setText(str9);}else{QString str ui-lineEdit_2-text();ui-lineEdit_2-setText(str9);}
}void Widget::on_pushButton_14_clicked()
{if(flag 0){QString str ui-lineEdit-text();ui-lineEdit-setText(str0);}else{QString str ui-lineEdit_2-text();ui-lineEdit_2-setText(str0);}
}//符号按钮
//
void Widget::on_pushButton_16_clicked()
{flag 1;symbol ;ui-label-setText();
}//-
void Widget::on_pushButton_12_clicked()
{flag 1;symbol -;ui-label-setText(-);
}//*
void Widget::on_pushButton_8_clicked()
{flag 1;symbol *;ui-label-setText(*);
}///
void Widget::on_pushButton_4_clicked()
{flag 1;symbol /;ui-label-setText(/);
}//
void Widget::on_pushButton_15_clicked()
{QString str ui-lineEdit-text();QString ptr ui-lineEdit_2-text();double x str.toInt();double y ptr.toInt();if(symbol ){double num x y;QString str QString::number(num);ui-lineEdit_3-setText(str);}if(symbol -){double num x - y;QString str QString::number(num);ui-lineEdit_3-setText(str);}if(symbol *){double num x * y;QString str QString::number(num);ui-lineEdit_3-setText(str);}if(symbol /){double num x / y;QString str QString::number(num);ui-lineEdit_3-setText(str);}
}//清除
void Widget::on_pushButton_13_clicked()
{flag 0;ui-lineEdit-clear();ui-lineEdit_2-clear();ui-lineEdit_3-clear();ui-label-clear();
}
测试文件
#include widget.h#include QApplicationint main(int argc, char *argv[])
{QApplication a(argc, argv);Widget w;w.show();return a.exec();
}
