QT图形界面文字、按钮设计应用实例

冷不防 2022-12-19 06:18 159阅读 0赞

任务要求：  
设计一个串口，有一个QLabel，两个QPushbutton。  
当点击按钮1时让QLabel中文字在"你好"和"再见"之间切换。  
当点击按钮2时让QLable中文字的颜色在绿色和红色之间切换。

QT工程的创建请跳转：[https://blog.csdn.net/weixin\_43793181/article/details/109519743][https_blog.csdn.net_weixin_43793181_article_details_109519743]  
  
main.c

#include "widget.h"
    #include <QApplication>
    
    int main(int argc, char *argv[])
    { 
        QApplication a(argc, argv);
        Widget w;
    
        w.resize(800,480);
    
        w.show();
    
        return a.exec();
    }

widget.h

#ifndef WIDGET_H
    #define WIDGET_H
    
    #include <QWidget>
    #include <QLabel>
    #include <QPushButton>
    
    
    class Widget : public QWidget
    { 
        Q_OBJECT
    
    public:
        Widget(QWidget *parent = nullptr);
        ~Widget();
    
    signals:
        void testclicked();
    
    private slots:
       int myclicked1();
       int myclicked2();
       int myclicked3();
    
    private:
       int string_flag = 0;
       int color_flag = 0;
       QLabel *lab;
       QPushButton *button1;
       QPushButton *button2;
       QPushButton *button3;
    
    };
    
    #endif // WIDGET_H

widget.cpp

#include "widget.h"
    #include <QDebug>
    
    
    Widget::Widget(QWidget *parent) :
        QWidget(parent)
    { 
        lab = new QLabel(this);
        button1 = new QPushButton("1",this);
        button2 = new QPushButton("2",this);
        button3 = new QPushButton("退出",this);
    
        button1->move(200,400);
        button2->move(500,400);
        button3->move(680,0);
    
        QObject::connect(button1,SIGNAL(clicked()),this,SLOT(myclicked1()));
        QObject::connect(button2,SIGNAL(clicked()),this,SLOT(myclicked2()));
        QObject::connect(button3,SIGNAL(clicked()),this,SLOT(myclicked3()));
    }
    
    int Widget :: myclicked1()
    { 
        if(string_flag == 0)
        { 
            string_flag =1;
            lab->setText("你好！");
            lab->move(350,100);
            lab->resize(300,200);
            QFont font("Times",30,5,false);
            lab->setFont(font);
    
            QPalette p;
            QColor color(0,0,0);
            p.setColor(QPalette::WindowText,color);
            lab->setPalette(p);
            return 0;
        }
    
        else
        { 
            string_flag = 0;
            lab->setText("再见！");
            lab->move(350,100);
            lab->resize(300,200);
            QFont font("Times",30,5,false);
            lab->setFont(font);
    
            QPalette p;
            QColor color(0,0,0);
            p.setColor(QPalette::WindowText,color);
            lab->setPalette(p);
            return 0;
        }
    }
    
    int Widget :: myclicked2()
    { 
        if(color_flag == 0)
        { 
            QPalette p;
            QColor color(0,255,0);
            p.setColor(QPalette::WindowText,color);
            lab->setPalette(p);
            color_flag =1;
            return 0;
        }
    
        else
        { 
            QPalette p;
            QColor color(255,0,0);
            p.setColor(QPalette::WindowText,color);
            lab->setPalette(p);
            color_flag = 0;
            return 0;
        }
    }
    
    int Widget :: myclicked3()
    { 
       exit(0);
    }
    
    Widget::~Widget()
    { 
    
    }

程序运行会弹出如下窗口  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ_size_16_color_FFFFFF_t_70_pic_center]  
接着按1，2，2，1，2，2，对应效果如下  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ_size_16_color_FFFFFF_t_70_pic_center 1]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ_size_16_color_FFFFFF_t_70_pic_center 2]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ_size_16_color_FFFFFF_t_70_pic_center 3]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ_size_16_color_FFFFFF_t_70_pic_center 4]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ_size_16_color_FFFFFF_t_70_pic_center 5]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ_size_16_color_FFFFFF_t_70_pic_center 6]

[https_blog.csdn.net_weixin_43793181_article_details_109519743]: https://blog.csdn.net/weixin_43793181/article/details/109519743
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ_size_16_color_FFFFFF_t_70_pic_center]: /images/20221120/a163f48533484340983c402745026fcb.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ_size_16_color_FFFFFF_t_70_pic_center 1]: /images/20221120/6eb87d9fb62e4328835eff5cc078be4a.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ_size_16_color_FFFFFF_t_70_pic_center 2]: https://img-blog.csdnimg.cn/20201105203804569.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ==,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ_size_16_color_FFFFFF_t_70_pic_center 3]: https://img-blog.csdnimg.cn/20201105203811877.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ==,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ_size_16_color_FFFFFF_t_70_pic_center 4]: https://img-blog.csdnimg.cn/20201105203818843.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ==,size_16,color_FFFFFF,t_70#pic_center
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ_size_16_color_FFFFFF_t_70_pic_center 6]: https://img-blog.csdnimg.cn/20201105203835103.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ==,size_16,color_FFFFFF,t_70#pic_center