1.相关说明

文件选择弹框、目录选择弹框、保存文件弹框、颜色选择弹框、字体选择弹框、进度条弹框、输入对话框、标准消息框等

2.相关界面

3.相关代码

#include "widget.h"
#include "ui_widget.h"
#include <QFileDialog>
#include <QProgressDialog>
#include <QElapsedTimer>
#include <QColorDialog>
#include <QFontDialog>
#include <QLineEdit>
#include <QInputDialog>
#include <QMessageBox>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
}

Widget::~Widget()
{
    delete ui;
}
// 打开文件
void Widget::on_btnOpenOneFile_clicked()
{
    QString curPath = QCoreApplication::applicationDirPath();
    QString fileName = QFileDialog::getOpenFileName(this, "选择一个文件", curPath, "(*.txt);;(*.jpg *.png);;(*.*)");
    if(!fileName.isEmpty()){
        ui->plainTextEdit->appendPlainText(fileName);
    }
}
// 打开多个文件
void Widget::on_btnOpenManyFiles_clicked()
{
    QString curPath = QCoreApplication::applicationDirPath();
    QStringList fileNames = QFileDialog::getOpenFileNames(this, "选择一个或多个文件",
                                                    curPath, "(*.txt);;(*.jpg *.png);;(*.*)");
    for(auto &fileName : fileNames){
        ui->plainTextEdit->appendPlainText(fileName);
    }
}
// 选择已有目录
void Widget::on_btnChooseDir_clicked()
{
    QString curPath = QCoreApplication::applicationDirPath();
    QString selectedDir = QFileDialog::getExistingDirectory(this, "选择目录", curPath);
    if(!selectedDir.isEmpty()){
        ui->plainTextEdit->appendPlainText(selectedDir);
    }
}
// 保存文件
void Widget::on_btnSaveFile_clicked()
{
    QString curPath = QCoreApplication::applicationDirPath();
    QString fileName = QFileDialog::getSaveFileName(this, "保存文件", curPath, "(*.txt);;(*.jpg *.png);;(*.*)");
    if(!fileName.isEmpty()){
        ui->plainTextEdit->appendPlainText(fileName);
    }
}

// 进度条对话框
void Widget::on_btnProgress_clicked()
{
    int minValue = 0;
    int maxValue = 200;
    QProgressDialog dlgProgress("正在复制文件...", "取消", minValue, maxValue, this);
    dlgProgress.setWindowTitle("复制文件");
    dlgProgress.setWindowModality(Qt::WindowModal);
    connect(&dlgProgress, &QProgressDialog::canceled, [&]{ui->plainTextEdit->appendPlainText("进度已取消！！！");});
    QElapsedTimer msCounter;
    for(int i = minValue; i <= maxValue; i++){
        dlgProgress.setValue(i);
        dlgProgress.setLabelText(QString::asprintf("当前进度:%d", i));
        msCounter.start();
        while(true){
            if(msCounter.elapsed() > 30){
                break;
            }
        }
        if(dlgProgress.wasCanceled()){
            break;
        }
    }
}
// 选择颜色
void Widget::on_btnChooseColor_clicked()
{
    QPalette pale = ui->plainTextEdit->palette();
    QColor iniColor = pale.color(QPalette::Text);
    QColor color = QColorDialog::getColor(iniColor, this, "选择颜色");
    if(color.isValid()){
        pale.setColor(QPalette::Text, color);
        ui->plainTextEdit->setPalette(pale);
    }
}
// 选择字体
void Widget::on_btnChooseFont_clicked()
{
    QFont iniFont = ui->plainTextEdit->font();
    bool ok = false;
    QFont font = QFontDialog::getFont(&ok, iniFont, this, "设置字体");
    if(ok){
        ui->plainTextEdit->setFont(font);
    }
}
// 输入字符串
void Widget::on_btnInputChars_clicked()
{
    QString dlgTitle = "输入文字对话框";
    QString txtLabel = "请输入文件名";
    QString iniInput = "默认文字";
    QLineEdit::EchoMode echoMode = QLineEdit::Normal; // QLineEdit::Password
    bool ok = false;
    QString text = QInputDialog::getText(this, dlgTitle, txtLabel, echoMode, iniInput,&ok);
    if(ok && !text.isEmpty()){
        ui->plainTextEdit->appendPlainText(text);
    }
}
// 输入整数
void Widget::on_btnInputInt_clicked()
{
    QString dlgTitle = "输入整数对话框";
    QString txtLabel = "设置文本框字体大小";
    int defaultValue = ui->plainTextEdit->font().pointSize();
    int minValue = 6;
    int maxValue = 60;
    int stepValue = 1;
    bool ok = false;
    int inputValue = QInputDialog::getInt(this, dlgTitle, txtLabel, defaultValue, minValue, maxValue, stepValue, &ok);
    if(ok){
        QString str = QString("文本框字体大小被设置为:%1").arg(inputValue);
        ui->plainTextEdit->appendPlainText(str);
        QFont font = ui->plainTextEdit->font();
        font.setPointSize(inputValue);
        ui->plainTextEdit->setFont(font);
    }
}
// 输入浮点数
void Widget::on_btnInputFloat_clicked()
{
    QString dlgTitle = "输入浮点数对话框";
    QString txtLabel = "输入一个浮点数";
    float defaultValue = 6.14;
    float minValue = 6;
    float maxValue = 60;
    int decimals = 2;
    bool ok = false;
    float inputValue = QInputDialog::getDouble(this, dlgTitle, txtLabel, defaultValue, minValue, maxValue, decimals, &ok);
    if(ok){
        QString str = QString::asprintf("输入的浮点为：%.2f", inputValue);
        ui->plainTextEdit->appendPlainText(str);
    }
}
// 条目选择输入
void Widget::on_btnInputItem_clicked()
{
    QStringList items;
    items << "优" << "良" << "中" << "差";
    QString dlgTitle = "输入项对话框";
    QString txtLabel = "请选择一个级别";
    int curIndex = 0;
    bool editable = false;
    bool ok = false;
    QString text = QInputDialog::getItem(this, dlgTitle, txtLabel, items, curIndex, editable, &ok);
    if(ok && !text.isEmpty()){
        ui->plainTextEdit->appendPlainText(text);
    }
}
// question对话框
void Widget::on_btnQuestion_clicked()
{
    QString dlgTitle = "Question消息框";
    QString strInfo = "文件已被修改，是否保存？";
    int result = QMessageBox::question(this, dlgTitle, strInfo,
                                       QMessageBox::Yes|QMessageBox::No|QMessageBox::Cancel, QMessageBox::NoButton);
    if(result == QMessageBox::Yes){
        ui->plainTextEdit->appendPlainText("Question消息框：Yes被选中");
    } else if(result == QMessageBox::No){
        ui->plainTextEdit->appendPlainText("Question消息框：No被选中");
    }else if(result == QMessageBox::Cancel){
        ui->plainTextEdit->appendPlainText("Question消息框：Cancel被选中");
    }else{
        ui->plainTextEdit->appendPlainText("Question消息框：没有按钮被选中");
    }
}
// info弹框
void Widget::on_btnInfo_clicked()
{
    QString dlgTitle = "Infomation消息框";
    QString strInfo = "文件已打开，请检查";
    QMessageBox::information(this, dlgTitle, strInfo);

}
// warning弹窗
void Widget::on_btnWarning_clicked()
{
    QString dlgTitle = "Warning消息框";
    QString strInfo = "文件已被修改";
    QMessageBox::warning(this, dlgTitle, strInfo);
}
// critical错误弹窗
void Widget::on_btnCritical_clicked()
{
    QString dlgTitle = "Critical消息框";
    QString strInfo = "文件已被修改！！！";
    QMessageBox::critical(this, dlgTitle, strInfo);
}
// 自定义关于
void Widget::on_btnAbout_clicked()
{
    QString dlgTitle = "About消息框";
    QString strInfo = "XXXX版本1.0";
    QMessageBox::about(this, dlgTitle, strInfo);
}
// aboutQt消息框
void Widget::on_btnAboutQt_clicked()
{
    QString dlgTitle = "aboutQt消息框";
    QMessageBox::aboutQt(this, dlgTitle);
}