Qt第十四天

野性酷女 2022-04-05 12:44 480阅读 0赞

## 标准对话框 ##

**QFileDialog文件对话框  
QColorDialog颜色对话框  
QFontDialog字体对话框  
QInputDialog输入对话框  
QMessageBox消息框**  
dialog.h

#ifndef DIALOG_H
    #define DIALOG_H
    
    
    #include <QDialog>
    
    
    namespace Ui {
    class Dialog;
    }
    
    
    class Dialog : public QDialog
    {
        Q_OBJECT
    
    
    public:
        explicit Dialog(QWidget *parent = nullptr);
        ~Dialog();
    
    
    private slots:
        void on_pushButton_clicked();
    
    
        void on_pushButton_2_clicked();
    
    
        void on_pushButton_3_clicked();
    
    
        void on_pushButton_4_clicked();
    
    
        void on_pushButton_5_clicked();
    
    
        void on_pushButton_6_clicked();
    
    
        void on_pushButton_13_clicked();
    
    
        void on_pushButton_14_clicked();
    
    
        void on_pushButton_15_clicked();
    
    
        void on_pushButton_16_clicked();
    
    
    
    
    
    
        void on_pushButton_7_clicked();
    
    
        void on_pushButton_8_clicked();
    
    
        void on_pushButton_9_clicked();
    
    
        void on_pushButton_10_clicked();
    
    
        void on_pushButton_11_clicked();
    
    
        void on_pushButton_12_clicked();
    
    
        void on_pushButton_17_clicked();
    
    
    private:
        Ui::Dialog *ui;
    };
    
    
    #endif // DIALOG_H

dialog.cpp

#include "dialog.h"
    #include "ui_dialog.h"
    
    
    #include<QFileDialog>
    #include<QColorDialog>
    #include<QFontDialog>
    #include<QLineEdit>
    #include<QInputDialog>
    #include<QPlainTextEdit>
    #include<QMessageBox>
    
    
    Dialog::Dialog(QWidget *parent) :
        QDialog(parent),
        ui(new Ui::Dialog)
    {
        ui->setupUi(this);
    }
    
    
    Dialog::~Dialog()
    {
        delete ui;
    }
    
    
    void Dialog::on_pushButton_clicked()//打开单个文件
    {
        QString curPath=QDir::currentPath();
        QString dlgTital="选择一个文件";//设置对话框标题
        QString filter="文本文件(*.txt);;图片文件(*.jpg*.gif);;所有文件(*.*)";//设置筛选
        QString aFileName=QFileDialog::getOpenFileName(this,dlgTital,curPath,filter);
        if(!aFileName.isEmpty())
        {
            ui->plainTextEdit->appendPlainText(aFileName);
        }
    }
    
    
    void Dialog::on_pushButton_2_clicked()//打开多个文件
    {
        QString curPath=QDir::currentPath();
        QString dlgTital="选择多个文件";//设置对话框标题
        QString filter="文本文件(*.txt);;图片文件(*.jpg*.gif);;所有文件(*.*)";//设置筛选
        QStringList aFileNames=QFileDialog::getOpenFileNames(this,dlgTital,curPath,filter);
        for(int i=0;i<aFileNames.count();i++)
        {
            ui->plainTextEdit->appendPlainText(aFileNames.at(i));
        }
    }
    
    
    void Dialog::on_pushButton_3_clicked()//选择已有目录
    {
        QString curPath=QCoreApplication::applicationDirPath();
        QString dlgTital="选择一个目录";
        QString selectedDir=QFileDialog::getExistingDirectory(this,dlgTital,curPath,QFileDialog::ShowDirsOnly);//QFileDialog::ShowDirsOnly表示只显示目录
        if(!selectedDir.isEmpty())
        {
            ui->plainTextEdit->appendPlainText(selectedDir);
        }
    }
    
    
    void Dialog::on_pushButton_4_clicked()//保存文件
    {
        QString curPath=QCoreApplication::applicationDirPath();
        QString dlgTital="保存文件";
        QString filter= "文本文件(*.txt);;图片文件(*.jpg*.gif);;所有文件(*.*)";//设置筛选
        QString aFileName=QFileDialog::getSaveFileName(this,dlgTital,curPath,filter);
        if(!aFileName.isEmpty())
        {
            ui->plainTextEdit->appendPlainText(aFileName);
        }
    }
    
    
    
    
    void Dialog::on_pushButton_5_clicked()//选择颜色
    {
        QPalette pal=ui->plainTextEdit->palette();//获取现有的palette
        QString dlgTital="选择颜色";
        QColor iniColor=pal.color(QPalette::Text);//现有文字颜色
        QColor color=QColorDialog::getColor(iniColor,this,dlgTital);
        if(color.isValid())
        {
            pal.setColor(QPalette::Text,color);
            ui->plainTextEdit->setPalette(pal);
        }
    }
    
    
    void Dialog::on_pushButton_6_clicked()//选择字体
    {
        QFont iniFont=ui->plainTextEdit->font();
        bool ok=false;
        QFont font=QFontDialog::getFont(&ok,iniFont);
        if(ok)
        {
            ui->plainTextEdit->setFont(font);
        }
    }
    
    
    void Dialog::on_pushButton_13_clicked()//输入字符串
    {
        QString dlgTital="输入文字对话框";
        QString txtLabel="请输入文件名";
        QString defaultInput="新建文件.txt";
        QLineEdit::EchoMode echoMode=QLineEdit::Password;//密码输入
        bool ok=false;
        QString text=QInputDialog::getText(this,dlgTital,txtLabel,echoMode,defaultInput,&ok);
        if(ok&&!text.isEmpty())
        {
            ui->plainTextEdit->appendPlainText(text);
        }
    }
    
    
    void Dialog::on_pushButton_14_clicked()//输入整数
    {
        QString dlgTitle="输入整数对话框";
        QString txtLabel="设置字体大小";
        int defaultValue=ui->plainTextEdit->font().pointSize(); //现有字体大小
        int minValue=6, maxValue=50,stepValue=1;//范围，步长
        bool ok=false;
        int inputValue = QInputDialog::getInt(this, dlgTitle,txtLabel,defaultValue, minValue,maxValue,stepValue,&ok);
        if (ok) //是否确认输入
        {
            QFont   font=ui->plainTextEdit->font();
            font.setPointSize(inputValue);
            ui->plainTextEdit->setFont(font);
        }
    }
    
    
    void Dialog::on_pushButton_15_clicked()//输入浮点数
    {
        QString dlgTitle="输入浮点数对话框";
        QString txtLabel="输入一个浮点数";
        double defaultValue=3.13;
        double minValue=0, maxValue=10000;//范围
        int decimals=2;//小数点位数
        bool ok=false;
        double inputValue = QInputDialog::getDouble(this, dlgTitle,txtLabel,defaultValue, minValue,maxValue,decimals,&ok);
        if (ok) //确认选择
        {
            QString str=QString::asprintf("输入了一个浮点数:%.2f",inputValue);
            ui->plainTextEdit->appendPlainText(str);
        }
    }
    
    
    void Dialog::on_pushButton_16_clicked()//下拉列表选择
    {
        QStringList items; //ComboBox 列表的内容
        items <<"优秀"<<"良好"<<"合格"<<"不合格";
        QString dlgTitle="条目选择对话框";
        QString txtLabel="请选择级别";
        int     curIndex=0; //初始选择项
        bool    editable=false; //ComboBox是否可编辑
        bool    ok=false;
        QString text = QInputDialog::getItem(this, dlgTitle,txtLabel,items,curIndex,editable,&ok);
        if (ok && !text.isEmpty())
            ui->plainTextEdit->appendPlainText(text);
    }
    
    
    void Dialog::on_pushButton_7_clicked()//question
    {
        QString dlgTitle="Question消息框";
        QString strInfo="文件已被修改，是否保存修改？";
    
    
        QMessageBox::StandardButton  defaultBtn=QMessageBox::NoButton; //缺省按钮
    
    
        QMessageBox::StandardButton result;//返回选择的按钮
        result=QMessageBox::question(this, dlgTitle, strInfo,
                          QMessageBox::Yes|QMessageBox::No |QMessageBox::Cancel,//设置三个按钮
                          defaultBtn);
    
    
        if (result==QMessageBox::Yes)
            ui->plainTextEdit->appendPlainText("Question消息框: Yes 被选择");
        else if(result==QMessageBox::No)
            ui->plainTextEdit->appendPlainText("Question消息框: No 被选择");
        else if(result==QMessageBox::Cancel)
            ui->plainTextEdit->appendPlainText("Question消息框: Cancel 被选择");
        else
            ui->plainTextEdit->appendPlainText("Question消息框: 无选择");
    }
    
    
    void Dialog::on_pushButton_8_clicked()//information
    {
        QString dlgTitle="information消息框";
        QString strInfo="文件已经打开，字体大小已设置";
        QMessageBox::information(this, dlgTitle, strInfo,QMessageBox::Ok,QMessageBox::NoButton);//缺省按钮
    }
    
    
    void Dialog::on_pushButton_9_clicked()//warning
    {
        QString dlgTitle="warning 消息框";
        QString strInfo="文件内容已经被修改";
        QMessageBox::warning(this, dlgTitle, strInfo);
    }
    
    
    void Dialog::on_pushButton_10_clicked()//critical
    {
        QString dlgTitle="critical消息框";
        QString strInfo="有不明程序访问网络";
        QMessageBox::critical(this, dlgTitle, strInfo);
    }
    
    
    void Dialog::on_pushButton_11_clicked()//about
    {
        QString dlgTitle="about消息框";
        QString strInfo="我开发的数据查看软件 V2.11 \n 保留所有版权";
        QMessageBox::about(this, dlgTitle, strInfo);
    }
    
    
    void Dialog::on_pushButton_12_clicked()//aboutQt
    {
        QString dlgTitle="aboutQt消息框";
        QMessageBox::aboutQt(this, dlgTitle);
    }
    
    
    void Dialog::on_pushButton_17_clicked()//清空文本框
    {
        ui->plainTextEdit->clear();
    }

dialog.ui  
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![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RoZVJvb2tpZTE_size_16_color_FFFFFF_t_70 1]

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