QT常用控件(二)

#include "widget.h"
#include "ui_widget.h"
#include <QIcon>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    QIcon icon(":/Cat.png");
    //设置图标
    ui->pushButton->setIcon(icon);
    //设置图标大小
    ui->pushButton->setIconSize(QSize(50,50));
}

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

#include "widget.h"
#include "ui_widget.h"
#include <QRect>
#include <QDebug>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    //设置图标
    ui->pushButton_target->setIcon(QIcon(":/image/Cat.png"));
    ui->pushButton_target->setIconSize(QSize(50,50));

    ui->pushButton_up->setIcon(QIcon(":/image/Up.png"));
    ui->pushButton_up->setIconSize(QSize(30,30));

    ui->pushButton_down->setIcon(QIcon(":/image/Down.png"));
    ui->pushButton_down->setIconSize(QSize(30,30));
    ui->pushButton_left->setIcon(QIcon(":/image/Left.png"));
    ui->pushButton_left->setIconSize(QSize(20,20));
    ui->pushButton_right->setIcon(QIcon(":/image/Right.png"));
    ui->pushButton_right->setIconSize(QSize(20,20));

    //设置快捷键
    ui->pushButton_up->setShortcut(QKeySequence("w"));
    ui->pushButton_down->setShortcut(QKeySequence("s"));
    ui->pushButton_left->setShortcut(QKeySequence("a"));
    ui->pushButton_right->setShortcut(QKeySequence("d"));
    
    // 设置快捷键也可以写作
    // ui->pushButton_up->setShortcut(QKeySequence(Qt::Key_W));
    // ui->pushButton_down->setShortcut(QKeySequence(Qt::Key_S));
    // ui->pushButton_left->setShortcut(QKeySequence(Qt::Key_A));
    // ui->pushButton_right->setShortcut(QKeySequence(Qt::Key_D));

}

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

void Widget::on_pushButton_up_clicked()
{
    QRect rect = ui->pushButton_target->geometry();
    ui->pushButton_target->setGeometry(rect.x(),rect.y() - 5,rect.width(),rect.height());
    qDebug()<<"Up";

}


void Widget::on_pushButton_left_clicked()
{
    QRect rect = ui->pushButton_target->geometry();
    ui->pushButton_target->setGeometry(rect.x() - 5,rect.y(),rect.width(),rect.height());
    qDebug()<<"left";
}


void Widget::on_pushButton_right_clicked()
{
    QRect rect = ui->pushButton_target->geometry();
    ui->pushButton_target->setGeometry(rect.x() + 5,rect.y(),rect.width(),rect.height());
    qDebug()<<"rigt";
}


void Widget::on_pushButton_down_clicked()
{
    QRect rect = ui->pushButton_target->geometry();
    ui->pushButton_target->setGeometry(rect.x(),rect.y() + 5,rect.width(),rect.height());
    qDebug()<<"down";
}

    ui->pushButton_up->setAutoRepeat(true);
    ui->pushButton_down->setAutoRepeat(true);
    ui->pushButton_left->setAutoRepeat(true);
    ui->pushButton_right->setAutoRepeat(true);

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    ui->radioButton_male->setChecked(true);
    ui->label->setText("你选择的性别为:男");
}

#include "widget.h"
#include "ui_widget.h"

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

#include "widget.h"
#include "ui_widget.h"
#include <QDebug>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
}

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

void Widget::on_radioButton_clicked()
{
    qDebug()<<"clicked";
}


void Widget::on_radioButton_2_pressed()
{
    qDebug()<<"pressed";
}


void Widget::on_radioButton_3_released()
{
    qDebug()<<"released";
}


void Widget::on_radioButton_4_toggled(bool checked)
{
    if(checked)
        qDebug() << "toggled checked true";
    else
        qDebug() << "toggled checked false";
}

#include "widget.h"
#include "ui_widget.h"
#include <QButtonGroup>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    //创建三个组
    QButtonGroup * group1 = new QButtonGroup(this);
    QButtonGroup * group2= new QButtonGroup(this);
    QButtonGroup * group3 = new QButtonGroup(this);

    // 把 QRadioButton 两两⼀组, 放到三个 QButtonGroup 中.
    group1->addButton(ui->radioButton);
    group1->addButton(ui->radioButton_2);

    group2->addButton(ui->radioButton_3);
    group2->addButton(ui->radioButton_4);

    group3->addButton(ui->radioButton_5);
    group3->addButton(ui->radioButton_6);
}

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

#include "widget.h"
#include "ui_widget.h"
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
}

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

void Widget::on_pushButton_clicked()
{
    QString Result = "今天你的安排是:";
    if(ui->checkBox_eat->isChecked())
    {
        Result +=ui->checkBox_eat->text() + " ";
    }
    if(ui->checkBox_sleep->isChecked())
    {
        Result +=ui->checkBox_sleep->text() + " ";
    }

    if(ui->checkBox_play->isChecked())
    {
        Result +=ui->checkBox_play->text() + " ";
    }
    ui->label->setText(Result);
}

#include "widget.h"
#include "ui_widget.h"
#include <QResizeEvent>
#include <qDebug>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    ui->label->setGeometry(0,0,800,600);

    QPixmap pixmap(":/Cat.png");
    ui->label->setPixmap(pixmap);
}

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

#include "widget.h"
#include "ui_widget.h"
#include <QResizeEvent>
#include <qDebug>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    ui->label->setGeometry(0,0,800,600);

    QPixmap pixmap(":/Cat.png");
    ui->label->setPixmap(pixmap);
    //设置拉伸
    ui->label->setScaledContents(true);
}

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

#include "widget.h"
#include "ui_widget.h"
#include <QResizeEvent>
#include <qDebug>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    ui->label->setGeometry(0,0,800,600);

    QPixmap pixmap(":/Cat.png");
    ui->label->setPixmap(pixmap);
    //设置拉伸
    ui->label->setScaledContents(true);
}

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

void Widget::resizeEvent(QResizeEvent *event)
{
    ui->label->setGeometry(0,0,event->size().width(),event->size().height());
    qDebug() <<event->size();
}

#include "widget.h"
#include "ui_widget.h"

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

    //设置文字居中对齐
    ui->label->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
    ui->label->setText("垂直水平居中的文本");

    //设置自动换行
    ui->label_2->setAlignment(Qt::AlignTop | Qt::AlignLeft);
    ui->label_2->setWordWrap(true);
    ui->label_2->setText("这是一段很长的文本这是一段很长的文本这是一段很长的文本这是一段很长的文本这是一段很长的文本");

    //设置首行缩进
    ui->label_3->setAlignment(Qt::AlignTop | Qt::AlignLeft);
    ui->label_3->setIndent(20);
    ui->label_3->setText("这是一段很长的文本这是一段很长的文本这是一段很长的文本这是一段很长的文本这是一段很长的文本");

    //设置边距
    ui->label_4->setAlignment(Qt::AlignTop | Qt::AlignLeft);
    ui->label_4->setMargin(20);
    ui->label_4->setText("这是一段很长的文本这是一段很长的文本这是一段很长的文本这是一段很长的文本这是一段很长的文本");
}

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

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    ui->label->setBuddy(ui->radioButton);
    ui->label_2->setBuddy(ui->radioButton_2);
}

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

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

QT_BEGIN_NAMESPACE
namespace Ui {
class Widget;
}
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();
    void updateTime();

private:
    Ui::Widget *ui;
    QTimer * timer;
};
#endif // WIDGET_H

#include "widget.h"
#include "ui_widget.h"
#include <QTimer>
#include <qDebug>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    //创建QTimer实例
    timer = new QTimer(this);
    //链接信号槽,QTimer会每间隔一定的时间触发一个timeout信号.所以将timeout信号与updatetime连接起来
    connect(timer,&QTimer::timeout,this,&Widget::updateTime);
    //启动 QTimer,并且规定每隔 1000ms 触发⼀次 timeout 信号.
    timer->start(1000);
}

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

void Widget::updateTime()
{
    qDebug() << "updateTime";

    int value = ui->lcdNumber->intValue();
    if(value <= 0)
    {
        //如果时间到,停止定时器
        timer->stop();
        return;
    }
    ui->lcdNumber->display(value - 1);
}

#include "widget.h"
#include "ui_widget.h"
#include <thread>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    int value = ui->lcdNumber->intValue();
    while(true)
    {
        std::this_thread::sleep_for(std::chrono::seconds(1));
        if(value <= 0)
            break;
        ui->lcdNumber->display(value - 1);
    }

}

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

#include "widget.h"
#include "ui_widget.h"
#include <thread>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    std::thread t([this]()
    {
        int value = this->ui->lcdNumber->intValue();
        while(true)
        {
            std::this_thread::sleep_for(std::chrono::seconds(1));
            if(value <= 0)
                break;
            this->ui->lcdNumber->display(value - 1);
        }
    });
}

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

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

QT_BEGIN_NAMESPACE
namespace Ui {
class Widget;
}
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();
    QTimer * timer;
    void updateProgressBar();

private:
    Ui::Widget *ui;
};
#endif // WIDGET_H

#include "widget.h"
#include "ui_widget.h"
#include <QTimer>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    //创建QTimer实例
    timer = new QTimer(this);
    //链接信号槽,QTimer会每隔一定的时间触发一个timeout信号,现在将timeout信号与updatetime连接起来,此时意味着每次触发 timeout 信号都会伴随 updateTime 函数的执⾏.
    connect(timer,&QTimer::timeout,this,&Widget::updateProgressBar);
    //启动QTimer,并且规定每间隔0.1s触发一次timeout信号
    timer->start(100);
}

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

void Widget::updateProgressBar()
{
    int value = ui->progressBar->value();
    if(value >= 100)
    {
        timer->stop();
        return;
    }
    ui->progressBar->setValue(value + 1);
}

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

QT_BEGIN_NAMESPACE
namespace Ui {
class Widget;
}
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();
    QTimer * timer;
    void UpdateTime();

private:
    Ui::Widget *ui;
};
#endif // WIDGET_H

#include "widget.h"
#include "ui_widget.h"
#include <QTimer>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    //创建QTimer实例
    timer = new QTimer(this);
    //链接信号槽,QTimer会每隔一定的时间触发一个timeout信号,现在将timeout信号与updatetime连接起来,此时意味着每次触发 timeout
    connect(timer,&QTimer::timeout,this,&Widget::UpdateTime);
    //启动QTimer,并且规定每间隔0.1s触发一次timeout信号
    timer->start(100);
}

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

void Widget::UpdateTime()
{
    int value = ui->progressBar->value();
    if(value >= 100)
    {
        timer->stop();
        return;
    }
    ui->progressBar->setValue(value + 1);
}

#include "widget.h"
#include "ui_widget.h"
#include  <QDebug>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
}

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

void Widget::on_calendarWidget_selectionChanged()
{
    QDate date = ui->calendarWidget->selectedDate();
    qDebug()<<date;
    ui->label->setText(date.toString());
}

#include "widget.h"
#include "ui_widget.h"
#include <QString>
#include <QDebug>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    //第一个输入框
    ui->lineEdit_Name->setPlaceholderText("请输入姓名");
    ui->lineEdit_Name->setClearButtonEnabled(true);

    //第二个输入框
    ui->lineEdit_PassWord->setPlaceholderText("请输入密码");
    ui->lineEdit_PassWord->setClearButtonEnabled(true);
    //设置显示方式,QLineEdit::Password:在这种模式下,输入的字符会被隐藏，通常⽤星号（*）或等号（=）代替。
    ui->lineEdit_PassWord->setEchoMode(QLineEdit::Password);

    //第三个输入框
    ui->lineEdit_Phone->setPlaceholderText("请输入电话号码");
    ui->lineEdit_Phone->setClearButtonEnabled(true);
    //对输入内容进行格式约束,验证手机号码必须是11位数字,并且按照"344"的格式来输入,
    ui->lineEdit_Phone->setInputMask("000-0000-0000");
}

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

void Widget::on_pushButton_clicked()
{
    QString gender = ui->radioButton_male->isChecked() ? "男" : "女";
    qDebug() << "姓名" <<ui->lineEdit_Name->text();
    qDebug() << "密码" <<ui->lineEdit_PassWord->text();
    qDebug() << "性别" <<gender;
    qDebug() << "手机" << ui->lineEdit_Phone->text();
}

#include "widget.h"
#include "ui_widget.h"
#include <QRegularExpression>
#include <QRegularExpressionValidator>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    //将按钮设置为禁用状态
    ui->pushButton->setEnabled(false);
    // 给 lineEdit 注册⼀个 validator
    ui->lineEdit->setValidator(new QRegularExpressionValidator(QRegularExpression("^1\\d{10}$")));
}

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

void Widget::on_lineEdit_textEdited(const QString &arg1)
{
    qDebug() << arg1;
    QString content = arg1;
    int pos = 0;
    //验证通过,设置按钮的可用状态为启用
    if(ui->lineEdit->validator()->validate(content,pos) == QValidator::Acceptable)
        ui->pushButton->setEnabled(true);
    //验证不通过,设置按钮的可用状态为禁用
    else
        ui->pushButton->setEnabled(false);
}

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    //QLineEdit::Password:在这种模式下，输⼊的字符会被隐藏，通常⽤星号（*）或等号（=）代替。
    ui->lineEdit->setEchoMode(QLineEdit::Password);
    ui->lineEdit_2->setEchoMode(QLineEdit::Password);
}

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

void Widget::on_lineEdit_textEdited(const QString &arg1)
{
    const QString & s1 = ui->lineEdit->text();
    const QString & s2 = ui->lineEdit_2->text();
    if(s1.isEmpty() && s2.isEmpty())
    {
        ui->label->setText("密码为空!");
    }
    else if(s1 == s2)
    {
        ui->label->setText("两次输入的密码相同!");
    }
    else
    {
        ui->label->setText("两次输入的密码不同!");
    }
}


void Widget::on_lineEdit_2_textEdited(const QString &arg1)
{
    const QString & s1 = ui->lineEdit->text();
    const QString & s2 = ui->lineEdit_2->text();
    if(s1.isEmpty() && s2.isEmpty())
    {
        ui->label->setText("密码为空!");
    }
    else if(s1 == s2)
    {
        ui->label->setText("两次输入的密码相同!");
    }
    else
    {
        ui->label->setText("两次输入的密码不同!");
    }
}

#include "widget.h"
#include "ui_widget.h"

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

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

void Widget::on_checkBox_toggled(bool checked)
{
    if(checked)
        ui->lineEdit->setEchoMode(QLineEdit::Normal);
    else
        ui->lineEdit->setEchoMode(QLineEdit::Password);
}

#include "widget.h"
#include "ui_widget.h"
#include <QDebug>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
}

Widget::~Widget()
{
    delete ui;
}
//文本内容改变时触发.
void Widget::on_textEdit_textChanged()
{
    //利用toPlainText函数获取文本信息
    qDebug()<<"[textChanged]" << ui->textEdit->toPlainText();
}

//选中范围改变时触发.
void Widget::on_textEdit_selectionChanged()
{
    const QTextCursor & cursor = ui->textEdit->textCursor();
    qDebug()<<"[selectionChanged]"<<cursor.selectedText();
}

//光标移动时触发.
void Widget::on_textEdit_cursorPositionChanged()
{
    const QTextCursor & cursor = ui->textEdit->textCursor();
    qDebug()<<"[cursorPositionChanged]" << cursor.position();
}


//可以进行undo操作时触发.
void Widget::on_textEdit_undoAvailable(bool b)
{
    qDebug() << "[undoAvailable]"<<b;
}

//可以进行redo操作时触发.
void Widget::on_textEdit_redoAvailable(bool b)
{
    qDebug() << "[redoAvailable]"<<b;
}



//文本被选中/取消选中时触发.
void Widget::on_textEdit_copyAvailable(bool b)
{
    qDebug() << "[copyAvailable]"<<b;
}

#include "widget.h"
#include "ui_widget.h"

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

    //添加⼀个条目.
    ui->comboBox->addItem("巨无霸");
    ui->comboBox->addItem("香辣鸡腿堡");
    ui->comboBox->addItem("劲脆鸡腿堡");

    ui->comboBox_2->addItem("薯条");
    ui->comboBox_2->addItem("麦辣鸡翅");

    ui->comboBox_3->addItem("可乐");
    ui->comboBox_3->addItem("雪碧");
}

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

void Widget::on_pushButton_clicked()
{
    //获取当前条目的文本内容.
    qDebug() <<"汉堡选择" << ui->comboBox->currentText();
    qDebug() <<"小食选择" << ui->comboBox_2->currentText();
    qDebug() <<"饮料选择" << ui->comboBox_3->currentText();
}

#include "widget.h"
#include "ui_widget.h"
#include <iostream>
#include <fstream>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    std::ifstream file("D:/log.txt");
    std::string line;
    //从文件读取数据,每次读一行,读取到line中
    while(std::getline(file,line))
    {
        //将std::string转换为QString.
        ui->comboBox->addItem(QString::fromStdString(line));
    }
    file.close();

}

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

#include "widget.h"
#include "ui_widget.h"
#include <QDebug>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    //初始化下拉框
    ui->comboBox->addItem("巨无霸");
    ui->comboBox->addItem("香辣鸡腿堡");
    ui->comboBox->addItem("劲脆鸡腿堡");

    ui->comboBox_2->addItem("薯条");
    ui->comboBox_2->addItem("麦辣鸡翅");
    ui->comboBox_2->addItem("鸡米花");

    ui->comboBox_3->addItem("可乐");
    ui->comboBox_3->addItem("雪碧");
    ui->comboBox_3->addItem("七喜");

    //初始化微调框
    ui->spinBox->setValue(1);
    ui->spinBox->setRange(1,5);
    ui->spinBox_2->setValue(1);
    ui->spinBox_2->setRange(1,5);
    ui->spinBox_3->setValue(1);
    ui->spinBox_3->setRange(1,5);
}

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

void Widget::on_pushButton_clicked()
{
    qDebug() << "当前下单的内容"
             <<ui->comboBox->currentText()   << ":" << ui->spinBox->value()
             <<ui->comboBox_2->currentText() << ":" << ui->spinBox_2->value()
             <<ui->comboBox_3->currentText() << ":" << ui->spinBox_3->value();
}

#include "widget.h"
#include "ui_widget.h"

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

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

void Widget::on_pushButton_clicked()
{
    //获取两个时间框的日期
    QDateTime timeOld = ui->dateTimeEdit_old->dateTime();
    QDateTime timeNew = ui->dateTimeEdit_new->dateTime();
    //计算日期差值,daysTo可计算两个日期的差值,如果当前得到的小时数不足24j,由于此处是整数除法,那么就会舍弃掉小数点后的内容
    int days  = (timeOld.secsTo(timeNew) / 3600) / 24;
    int hours = (timeOld.secsTo(timeNew) / 3600) % 24;

    QString text = QString("爱你已经持续了 ") + QString::number(days) +
                   QString(" 天 零 ")
                +  QString::number(hours) + QString("个小时!");
                   ui->label->setText(text);
}

#include "widget.h"
#include "ui_widget.h"

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

    //设置可以循环旋转
    ui->dial->setWrapping(true);
    //设置刻度线可见
    ui->dial->setNotchesVisible(true);
    //设置最大值为
    ui->dial->setMaximum(100);
    //设置最小值
    ui->dial->setMinimum(0);
    //设置初始值为
    ui->dial->setValue(100);
}

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

void Widget::on_dial_valueChanged(int value)
{
    //透明度是从0~1,因此强制类型转换为doule并且除以100
    ui->label->setText(QString("当前不透明度为:") + QString::number(value));
    this->setWindowOpacity((double)value / 100);
}

#include "widget.h"
#include "ui_widget.h"
#include <QDebug>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    //设置滑动条的最小值
    ui->horizontalSlider->setMinimum(500);
    //设置滑动条的最大值
    ui->horizontalSlider->setMaximum(2000);
    //设置改变的步长为100
    ui->horizontalSlider->setSingleStep(100);
    //设置初始值为800
    ui->horizontalSlider->setValue(800);

    //设置滑动条的最小值
    ui->verticalSlider->setMinimum(500);
    //设置滑动条的最大值
    ui->verticalSlider->setMaximum(1500);
    //设置改变的步长为100
    ui->verticalSlider->setSingleStep(100);
    //设置初始值为800
    ui->verticalSlider->setValue(600);

    //翻转朝向,默认滑块从下向上增⻓,改成从上往下增⻓.
    ui->verticalSlider->setInvertedAppearance(true);

}

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

void Widget::on_horizontalSlider_valueChanged(int value)
{
    QRect rect = this->geometry();
    this->setGeometry(rect.x(),rect.y(),value,rect.height());
    qDebug()<<"Width:"<<value;
}


void Widget::on_verticalSlider_valueChanged(int value)
{
    QRect rect = this->geometry();
    this->setGeometry(rect.x(),rect.y(),rect.width(),value);
    qDebug()<<"Height:"<<value;
}

#include "widget.h"
#include "ui_widget.h"
#include <QShortcut>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    ui->label->setText("");
    ui->horizontalSlider->setMinimum(0);
    ui->horizontalSlider->setMaximum(100);
    ui->horizontalSlider->setSingleStep(10);
    ui->horizontalSlider->setValue(0);

    //设置快捷键
    QShortcut * ShortCut1 = new QShortcut(this);
    ShortCut1->setKey(QKeySequence("-"));
    connect(ShortCut1,&QShortcut::activated,this,&Widget::SubValue);
    QShortcut * ShortCut2 = new QShortcut(this);
    ShortCut2->setKey(QKeySequence("+"));
    connect(ShortCut2,&QShortcut::activated,this,&Widget::AddValue);
}

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

void Widget::SubValue()
{
    int value = ui->horizontalSlider->value();
    ui->horizontalSlider->setValue(value - 20);
}

void Widget::AddValue()
{
    int value = ui->horizontalSlider->value();
    ui->horizontalSlider->setValue(value + 20);
}

void Widget::on_horizontalSlider_valueChanged(int value)
{
    ui->label->setText(QString::number(value));
}