QT学后感

对于QT，到目前为止，我还是非常不happy的。

学习QT之前，看到QT应用那么广，然后看到QT做出的图形效果那么好，当时是对QT抱有很大的期望的，但是今天一学，顿时就萎了。

入门老师花一个小时把QT能讲的东西都讲了，汗颜~

今天花了一上午去摸索，主要是摸索如何在画好界面之后，然后将界面和程序连接起来，结果搞了半天就把自己搞得超级超级烦。主要是自己把自己绕在那个界面上的信号和槽，老想通过f4来连。结果到最后在控件上一个“转到槽”+double信号函数就回到了熟悉的VC了，哎，真纠结。

之后，就自己写了个登录窗口。一上午就这么Over了，就为了这个窗口，一上午，就应该留作纪念的。

//QtLogin.pro
#-------------------------------------------------
#
# Project created by QtCreator 2012-07-24T09:36:42
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = QtLogin
TEMPLATE = app


SOURCES += main.cpp\
        widget.cpp

HEADERS  += widget.h

FORMS    += widget.ui

//widget.h
#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT
    
public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
    
private slots:
    void on_loginPushButton_clicked();

private:
    Ui::Widget *ui;
};

#endif // WIDGET_H



//widget.cpp
#include "widget.h"
#include "ui_widget.h"
#include <QMessageBox>
#include <QDesktopWidget>

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    ui->pwdTextEdit->setEchoMode(QLineEdit::Password);
    setAutoFillBackground(true);
    QPalette palette;
    palette.setBrush(QPalette::Background, QBrush(QPixmap("C:/pic/dear.jpg")));
    setPalette(palette);//shezhi
    this->setFixedSize(this->width(),this->height());
    QDesktopWidget* desktop = QApplication::desktop();
    move(desktop->width()/3,desktop->height()/4);
}

Widget::~Widget()
{
    delete ui;
}

void Widget::on_loginPushButton_clicked()
{
    if( ui->usrTextEdit->text()==tr("qt") && ui->pwdTextEdit->text()==tr("qwe123") || ui->usrTextEdit->text()==ui->pwdTextEdit->text()){
        QMessageBox::information(this, tr("Login success !"), tr("Welcome to ** System !"), QMessageBox::Ok);
    }
    else{
        QMessageBox::warning(this, tr("Login failed"), tr("Error user name or password, please retry.\r\nLogin failed!"),QMessageBox::Yes);
        //QMessageBox::information(NULL, "Title", "Content", QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes);
        ui->pwdTextEdit->clear();
        ui->usrTextEdit->clear();
    }
}

//main.cpp
#include <QApplication>
#include "widget.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    
    return a.exec();
}

//widget.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Widget</class>
 <widget class="QWidget" name="Widget">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>505</width>
    <height>383</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Widget</string>
  </property>
  <widget class="QLabel" name="label">
   <property name="geometry">
    <rect>
     <x>60</x>
     <y>100</y>
     <width>54</width>
     <height>20</height>
    </rect>
   </property>
   <property name="font">
    <font>
     <pointsize>12</pointsize>
    </font>
   </property>
   <property name="text">
    <string>用户名：</string>
   </property>
  </widget>
  <widget class="QLabel" name="label_2">
   <property name="geometry">
    <rect>
     <x>60</x>
     <y>180</y>
     <width>54</width>
     <height>20</height>
    </rect>
   </property>
   <property name="font">
    <font>
     <pointsize>12</pointsize>
    </font>
   </property>
   <property name="text">
    <string>密  码：</string>
   </property>
  </widget>
  <widget class="QPushButton" name="loginPushButton">
   <property name="geometry">
    <rect>
     <x>60</x>
     <y>280</y>
     <width>131</width>
     <height>51</height>
    </rect>
   </property>
   <property name="font">
    <font>
     <pointsize>12</pointsize>
    </font>
   </property>
   <property name="text">
    <string>登录</string>
   </property>
  </widget>
  <widget class="QPushButton" name="exitPushButton">
   <property name="geometry">
    <rect>
     <x>290</x>
     <y>282</y>
     <width>121</width>
     <height>51</height>
    </rect>
   </property>
   <property name="font">
    <font>
     <pointsize>12</pointsize>
    </font>
   </property>
   <property name="text">
    <string>退出</string>
   </property>
  </widget>
  <widget class="QLineEdit" name="pwdTextEdit">
   <property name="geometry">
    <rect>
     <x>140</x>
     <y>170</y>
     <width>271</width>
     <height>41</height>
    </rect>
   </property>
   <property name="font">
    <font>
     <pointsize>20</pointsize>
    </font>
   </property>
  </widget>
  <widget class="QLineEdit" name="usrTextEdit">
   <property name="geometry">
    <rect>
     <x>140</x>
     <y>90</y>
     <width>271</width>
     <height>41</height>
    </rect>
   </property>
   <property name="font">
    <font>
     <pointsize>20</pointsize>
    </font>
   </property>
  </widget>
  <widget class="QLabel" name="label_3">
   <property name="geometry">
    <rect>
     <x>80</x>
     <y>20</y>
     <width>351</width>
     <height>41</height>
    </rect>
   </property>
   <property name="font">
    <font>
     <pointsize>36</pointsize>
    </font>
   </property>
   <property name="text">
    <string>**欢迎你</string>
   </property>
  </widget>
 </widget>
 <layoutdefault spacing="6" margin="11"/>
 <resources/>
 <connections>
  <connection>
   <sender>exitPushButton</sender>
   <signal>clicked()</signal>
   <receiver>Widget</receiver>
   <slot>close()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>222</x>
     <y>143</y>
    </hint>
    <hint type="destinationlabel">
     <x>268</x>
     <y>137</y>
    </hint>
   </hints>
  </connection>
 </connections>
</ui>