QT学习笔记2（各种组件和四大布局）

我就是我 2022-12-24 11:55 386阅读 0赞

# 1、操作 #

**新建一个项目： **

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70][]

**目录文件：**

![20201128060632510.png][]

# 2、**窗口最大化、最小化和全屏** #

**使窗口最大化、最小化和全屏：**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 1][]

**代码：**

//处理最大化按钮的事件
        QPushButton * maxPushButton = new QPushButton(this);
        maxPushButton->setText("最大化");
        maxPushButton->setGeometry(100,100,80,30);
        this->connect(maxPushButton,&QPushButton::clicked,[=](){
           this->setWindowState(Qt::WindowMaximized);
        });
    
        //处理最小化按钮的事件
        QPushButton * minPushButton = new QPushButton(this);
        minPushButton->setText("最小化");
        minPushButton->setGeometry(200,100,80,30);
        this->connect(minPushButton,&QPushButton::clicked,[=](){
           this->setWindowState(Qt::WindowMinimized);
        });
    
        //处理全屏按钮的事件
        QPushButton * fullScreenPushButton = new QPushButton(this);
        fullScreenPushButton->setText("全屏");
        fullScreenPushButton->setGeometry(300,100,80,30);
        this->connect(fullScreenPushButton,&QPushButton::clicked,[=](){
           this->setWindowState(Qt::WindowFullScreen);
        });

# **3、窗口无边框** #

**使窗口无边框：**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 2][]

**代码：**

//处理关闭窗口事件
        QPushButton * closePushButton = new QPushButton(this);
        closePushButton->setText("关闭窗口");
        closePushButton->setGeometry(230,200,80,30);
        this->connect(closePushButton,&QPushButton::clicked,this,&QWidget::close);
    
        //设置无边框窗口
        setFixedSize(600,500);
        setWindowFlags(Qt::FramelessWindowHint);

# 4、QLabel的使用 #

## 4.1、显示文字 ##

QLabel * label = new QLabel(this);
    
    label->setText("我是label组件");

## 4.2、换行显示 ##

QLabel * label = new QLabel(this);
    
    label->setText("我是label组件\ntest");

## 4.3、设置样式：字体、字体颜色、背景 ##

setFixedSize(600,500);
        QLabel * label = new QLabel(this);
        label->setGeometry(200,200,100,60);
    
        label->setText("我是label组件\ntest");
        label->setStyleSheet(QString("background-color:#FF0000;"
                                     "color:#FFFFFF;"));
        label->setAlignment(Qt::AlignCenter);

## 4.4、显示图片、播放gif动画 ##

### 4.4.1、用qss来进行设置background-image、border-image、image ###

setFixedSize(600,500);
        QLabel * label = new QLabel(this);
        label->setGeometry(0,0,600,500);
    
        label->setText("我是label组件\ntest");
    //    label->setStyleSheet(QString("background-image: url(':/resource/index_logo.png') no-repeat;"));
    //    label->setStyleSheet(QString("image: url(':/resource/index_logo.png');"));
        label->setStyleSheet(QString("border-image: url(':/resource/index_logo.png');"));
    
        label->setAlignment(Qt::AlignCenter);

### 4.4.2、用QPixmap显示图片 ###

setFixedSize(600,500);
        QLabel * label = new QLabel(this);
        label->setGeometry(0,0,600,500);
    
        label->setText("我是label组件\ntest");
    //    label->setStyleSheet(QString("background-image: url(':/resource/index_logo.png') no-repeat;"));
    //    label->setStyleSheet(QString("image: url(':/resource/index_logo.png');"));
    //    label->setStyleSheet(QString("border-image: url(':/resource/index_logo.png');"));
    
        label->setAlignment(Qt::AlignCenter);
    
        QPixmap pixmap = QPixmap(":/resource/index_logo.png");
    
        label->setWordWrap(true);
    
        label->setPixmap(pixmap);

### 4.4.3、播放gif动画 ###

setFixedSize(600,500);
        QLabel * label = new QLabel(this);
        label->setGeometry(0,0,600,500);
    
        label->setText("我是label组件\ntest");
    //    label->setStyleSheet(QString("background-image: url(':/resource/index_logo.png') no-repeat;"));
    //    label->setStyleSheet(QString("image: url(':/resource/index_logo.png');"));
    //    label->setStyleSheet(QString("border-image: url(':/resource/index_logo.png');"));
    
        label->setAlignment(Qt::AlignCenter);
    
        QMovie * movie = new QMovie(":/resource/test.gif");
    
        label->setMovie(movie);
    
        label->show();
    
        movie->start();

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 3][]

### 4.5、设置富文本（label->setTextFormat(Qt::RichText);） ###

#include "mylabel.h"
    
    MyLabel::MyLabel(QWidget *parent) : QLabel(parent)
    {
    
    }
    
    void MyLabel::enterEvent(QEvent *event){
        this->setStyleSheet("background-color:#00FFFF;");
    }
    
    void MyLabel::leaveEvent(QEvent *event){
        this->setStyleSheet("background-color:#FF0000;");
    }

setFixedSize(600,500);
        MyLabel * label = new MyLabel(this);
        label->setGeometry(0,0,600,500);
    
        label->setText("我是label组件<br/>test<br/>"
                       "<a href='https://www.baidu.com'>百度一下</a>");
    
        label->setTextFormat(Qt::RichText);
    
        label->setAlignment(Qt::AlignCenter);
    
        label->setStyleSheet(QString("background-color:#FF0000;"
                                     "color:#FFFFFF;"));

### 4.6、选择和编辑 ###

setFixedSize(600,500);
        QLabel * label = new QLabel(this);
        label->setGeometry(0,0,600,500);
    
        label->setTextInteractionFlags(Qt::LinksAccessibleByKeyboard|Qt::LinksAccessibleByMouse|Qt::TextBrowserInteraction|Qt::TextEditable|Qt::TextEditorInteraction|Qt::TextSelectableByKeyboard|Qt::TextSelectableByMouse);
    
        label->setText("我是一个label标签<b/>"
                       "<a href='https://www.baidu.com'>百度一下</a>");
    
        label->setTextFormat(Qt::RichText);
    
        label->setStyleSheet("background-color:#FF0000;"
                             "color:#FFFFFF;");
    
        label->setAlignment(Qt::AlignCenter);

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 4][]

# 5、QPushButton的使用 #

## 5.1、事件设置 ##

setMinimumSize(600,500);
        QPushButton * closePushButton = new QPushButton(this);
    
        closePushButton->setGeometry(230,200,100,36);
        closePushButton->setText("关闭窗口按钮");
    
        this->connect(closePushButton,&QPushButton::clicked,[=](){
            this->close();
        });
    
        QPushButton * maxPushButton = new QPushButton(this);
        maxPushButton->setGeometry(340,200,100,36);
        maxPushButton->setText("最大化窗口按钮");
    
        this->connect(maxPushButton,&QPushButton::released,[=](){
            this->setWindowState(Qt::WindowMaximized);
        });

## 5.2、快捷键设置 ##

## 5.3、样式设置 ##

**QPushButton:hover、QPushButton:!hover：**

setMinimumSize(600,500);
        QPushButton * closePushButton = new QPushButton(this);
    
        closePushButton->setGeometry(230,200,200,36);
        closePushButton->setText("关闭窗口按钮");
    
        closePushButton->setStyleSheet("QPushButton:hover{"
                                       "background-color : #FF0000;"
                                       "color:#00FFFF;"
                                       "font-size:30px;"
                                       "}"
                                       ""
                                       "QPushButton:!hover{"
                                       "background-color : #FFFF00;"
                                       "color:#0000FF;"
                                       "font-size:20px;"
                                       "}"
                                       ""
                                       "background-color:#FFFF00;"
                                       "color:#0000FF;"
                                       "font-size:20px;");

# 6、QLineEdit的使用 #

## 6.1、属性方法 ##

setPlaceholderText：设置输入提示
    setFont：设置字体
    setReadOnly：设置是否可复制
    setMaxLength：设置输入字数的最大长度
    setEchoMode：设置输入框的模式：Normal, NoEcho, Password, PasswordEchoOnEdit

![20201129094414491.png][]

## 6.2、信号事件 ##

setMinimumSize(600,500);
        lineEdit = new QLineEdit(this);
    
        lineEdit->setGeometry(230,200,200,50);
    
        lineEdit->setPlaceholderText("请输入一行字符串");
        lineEdit->setFont(QFont("微软雅黑",16));
        lineEdit->setReadOnly(false);
        lineEdit->setMaxLength(3);
    
        QPushButton * undoPushButton = new QPushButton(this);
        undoPushButton->setGeometry(450,200,200,50);
        undoPushButton->setText("undo操作");
        this->connect(undoPushButton,&QPushButton::clicked,this,&Widget::dealClick);

## 6.3、qss样式 ##

lineEdit->setStyleSheet("QLineEdit{"
                                "border:2px solid red;"
                                "border-radius:2px;"
                                "}"
                                ""
                                "QLineEdit[echoMode='2']{"
                                "background-color:#CCCCCC;"
                                "}");

# 7、QObject的解读和布局类（Layout） #

## 7.1、递归遍历子节点（children()） ##

void Widget::listChildrens(QWidget * widget){
        QObjectList objectList = widget->children();
    
        for (int i=0;i<objectList.size();i++){
            qDebug() << objectList[i]->objectName();
            qDebug() << objectList[i]->metaObject()->className();
    
            listChildrens(qobject_cast<QWidget *>(objectList[i]));
        }
    }

setMinimumSize(600,500);
    
        QPushButton * pushButton = new QPushButton(this);
        pushButton->setObjectName("pushButton");
    
        QCheckBox * checkBox = new QCheckBox(this);
        checkBox->setObjectName("checkBox");
    
        QLabel * label = new QLabel(this);
        label->setObjectName("label");
    
        listChildrens(this);

## 7.2、Layout ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 5][]

**setContentsMargins：设置整个布局的间隔；setSpacing：设置组件间隔**

QVBoxLayout * vBoxLayout = new QVBoxLayout(layoutWidget);
    vBoxLayout->setContentsMargins(0,0,0,0);
    vBoxLayout->setSpacing(0);

**resize在layout里不起作用，应该用setMinimumSize进行大小的设置！！！ **

label->setMinimumSize(100,100);

### 7.2.1、QVBoxLayout ###

setMinimumSize(600,500);
    
        QWidget * layoutWidget = new QWidget(this);
    
        layoutWidget->setGeometry(0,0,200,200);
    
        layoutWidget->setStyleSheet("background-color: blue;");
    
        QVBoxLayout * vBoxLayout = new QVBoxLayout(layoutWidget);
        vBoxLayout->setContentsMargins(0,0,0,0);
        vBoxLayout->setSpacing(0);
    
    
        QPushButton * pushButton = new QPushButton(layoutWidget);
        pushButton->setObjectName("pushButton");
    
        pushButton->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Fixed);
        pushButton->setStyleSheet("background-color:green;margin:-1px;");
        QCheckBox * checkBox = new QCheckBox(layoutWidget);
        checkBox->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Fixed);
        checkBox->setObjectName("checkBox");
    
        checkBox->setStyleSheet("background-color:red;margin:-1px;");
    
        QLabel * label = new QLabel(layoutWidget);
        label->setObjectName("label");
    
        vBoxLayout->addWidget(pushButton);
        vBoxLayout->addWidget(checkBox);
        vBoxLayout->addWidget(label);

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 6][]

### 7.2.2、QHBoxLayout ###

setMinimumSize(600,500);
    
        QWidget * layoutWidget = new QWidget(this);
    
        layoutWidget->setGeometry(0,0,200,200);
    
        layoutWidget->setStyleSheet("background-color: blue;");
    
        QHBoxLayout * hBoxLayout = new QHBoxLayout(layoutWidget);
        hBoxLayout->setContentsMargins(0,0,0,0);
        hBoxLayout->setSpacing(0);
    
        hBoxLayout->setAlignment(Qt::AlignLeft);
    
    
        QPushButton * pushButton = new QPushButton(layoutWidget);
        pushButton->setObjectName("pushButton");
    
        pushButton->setSizePolicy(QSizePolicy::Fixed,QSizePolicy::Fixed);
        pushButton->setStyleSheet("background-color:green;margin:-1px;");
        QCheckBox * checkBox = new QCheckBox(layoutWidget);
        checkBox->setSizePolicy(QSizePolicy::Fixed,QSizePolicy::Fixed);
        checkBox->setObjectName("checkBox");
    
        checkBox->setStyleSheet("background-color:red;margin:-1px;");
    
        QLabel * label = new QLabel(layoutWidget);
        label->setObjectName("label");
    
        label->setSizePolicy(QSizePolicy::Fixed,QSizePolicy::Fixed);
    
        label->setMinimumSize(100,100);
    
        label->setStyleSheet("background-color:yellow;margin:-1px;");
    
        hBoxLayout->addWidget(pushButton);
        hBoxLayout->addWidget(checkBox);
        hBoxLayout->addWidget(label);

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 7][]

### 7.2.3、QGridLayout ###

gridLayout->setContentsMargins(0,0,0,0);
    gridLayout->setVerticalSpacing(0);
    gridLayout->setHorizontalSpacing(0);
        
    gridLayout->setSpacing(0);

setMinimumSize(600,500);
    
        QWidget * layoutWidget = new QWidget(this);
    
        layoutWidget->setGeometry(0,0,200,200);
    
        layoutWidget->setStyleSheet("background-color: blue;");
    
        QGridLayout * gridLayout = new QGridLayout(layoutWidget);
    
        gridLayout->setContentsMargins(0,0,0,0);
        gridLayout->setVerticalSpacing(0);
        gridLayout->setHorizontalSpacing(0);
    
        gridLayout->setSpacing(0);
    
        QPushButton * pushButton1 = new QPushButton(layoutWidget);
    
        pushButton1->setSizePolicy(QSizePolicy::Fixed,QSizePolicy::Fixed);
        pushButton1->setMinimumSize(50,50);
        pushButton1->setText("button1");
    
        QPushButton * pushButton2 = new QPushButton(layoutWidget);
    
        pushButton2->setMinimumSize(50,50);
        pushButton2->setText("button2");
    
        QPushButton * pushButton3 = new QPushButton(layoutWidget);
    
        pushButton3->setMinimumSize(50,50);
        pushButton3->setText("button3");
    
        QPushButton * pushButton4 = new QPushButton(layoutWidget);
    
        pushButton4->setMinimumSize(50,50);
        pushButton4->setText("button4");
    
        gridLayout->addWidget(pushButton1,0,0,Qt::AlignCenter);
        gridLayout->addWidget(pushButton2,0,1,Qt::AlignCenter);
        gridLayout->addWidget(pushButton3,0,2,Qt::AlignCenter);
        gridLayout->addWidget(pushButton4,1,1,Qt::AlignCenter);

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 8][]

**现象：内部的组件设置SizePolicy为Fixed不生效，默认会充满整个layout！！！**

### 7.2.4、QFormLayout ###

setMinimumSize(600,500);
    
        QWidget * layoutWidget = new QWidget(this);
    
        layoutWidget->setGeometry(0,0,200,200);
    
        layoutWidget->setStyleSheet("background-color: blue;");
    
        QFormLayout * formLayout = new QFormLayout(layoutWidget);
    
        formLayout->setContentsMargins(0,0,0,0);
        formLayout->setVerticalSpacing(0);
        formLayout->setHorizontalSpacing(0);
    
        formLayout->setSpacing(0);
    
        QPushButton * pushButton1 = new QPushButton(layoutWidget);
        pushButton1->setMinimumSize(50,50);
        pushButton1->setText("button1");
    
        QPushButton * pushButton2 = new QPushButton(layoutWidget);
    
        pushButton2->setMinimumSize(50,50);
        pushButton2->setText("button2");
    
        QPushButton * pushButton3 = new QPushButton(layoutWidget);
    
        pushButton3->setMinimumSize(50,50);
        pushButton3->setText("button3");
    
        QPushButton * pushButton4 = new QPushButton(layoutWidget);
    
        pushButton4->setMinimumSize(50,50);
        pushButton4->setText("button4");
    
        formLayout->insertRow(0,pushButton1,pushButton2);
        formLayout->insertRow(1,pushButton3,pushButton4);

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 9][]

**遍历QFormLayout：**

for (int i=0;i<formLayout->rowCount();i++){
            QLayoutItem * labelLayoutItem = formLayout->itemAt(i,QFormLayout::LabelRole);
            QLayoutItem * fieldLayoutItem = formLayout->itemAt(i,QFormLayout::FieldRole);
    
            QPushButton * labelPushButton = qobject_cast<QPushButton *>(labelLayoutItem->widget());
            QPushButton * fieldPushButton = qobject_cast<QPushButton *>(fieldLayoutItem->widget());
    
           qDebug() << labelPushButton->metaObject()->className();
           qDebug() << fieldPushButton->metaObject()->className();
    
        }

# 8、QCheckBox、QRadioButton、QButtonGroup的使用 #

## 8.1、QCheckBox ##

setMinimumSize(600,500);
    
        QCheckBox * checkBox = new QCheckBox(this);
    
        checkBox->setText("音乐");
    
        checkBox->setGeometry(100,100,100,30);

## 8.2、QButtonGroup结合QCheckBox使用 ##

setMinimumSize(600,500);
    
        QButtonGroup * buttonGroup = new QButtonGroup(this);
    
        QCheckBox * checkBox1 = new QCheckBox(this);
        checkBox1->setText("音乐");
        checkBox1->setGeometry(100,100,100,30);
    
        QCheckBox * checkBox2 = new QCheckBox(this);
        checkBox2->setText("水果");
        checkBox2->setGeometry(100,140,100,30);
    
        QCheckBox * checkBox3 = new QCheckBox(this);
        checkBox3->setText("蔬菜");
        checkBox3->setGeometry(100,180,100,30);
    
        buttonGroup->addButton(checkBox1);
        buttonGroup->addButton(checkBox2);
        buttonGroup->addButton(checkBox3);
    
        //设置是否为单选  true:单选 false:多选
        buttonGroup->setExclusive(true);

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 10][]

## 8.3、QButtonGroup结合QRadioButton使用 ##

setMinimumSize(600,500);
    
        QButtonGroup * buttonGroup = new QButtonGroup(this);
    
        QRadioButton * radioButton1 = new QRadioButton(this);
        radioButton1->setText("音乐");
        radioButton1->setGeometry(100,100,100,30);
    
        QRadioButton * radioButton2 = new QRadioButton(this);
        radioButton2->setText("水果");
        radioButton2->setGeometry(100,140,100,30);
    
        QRadioButton * radioButton3 = new QRadioButton(this);
        radioButton3->setText("蔬菜");
        radioButton3->setGeometry(100,180,100,30);
    
        buttonGroup->addButton(radioButton1);
        buttonGroup->addButton(radioButton2);
        buttonGroup->addButton(radioButton3);
    
        radioButton2->setChecked(true);
    
        //设置是否为单选  true:单选 false:多选
        buttonGroup->setExclusive(true);

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 11][]

**信号处理：**

setMinimumSize(600,500);
    
        QButtonGroup * buttonGroup = new QButtonGroup(this);
    
        QRadioButton * radioButton1 = new QRadioButton(this);
        radioButton1->setObjectName("radioButton1");
        radioButton1->setText("音乐");
        radioButton1->setGeometry(100,100,100,30);
    
        QRadioButton * radioButton2 = new QRadioButton(this);
        radioButton2->setObjectName("radioButton2");
        radioButton2->setText("水果");
        radioButton2->setGeometry(100,140,100,30);
    
        QRadioButton * radioButton3 = new QRadioButton(this);
        radioButton3->setObjectName("radioButton3");
        radioButton3->setText("蔬菜");
        radioButton3->setGeometry(100,180,100,30);
    
        buttonGroup->addButton(radioButton1,1);
        buttonGroup->addButton(radioButton2,2);
        buttonGroup->addButton(radioButton3,3);
    
        radioButton2->setChecked(true);
    
        //设置是否为单选  true:单选 false:多选
        buttonGroup->setExclusive(true);
    
        this->connect(buttonGroup,QOverload<QAbstractButton *>::of(&QButtonGroup::buttonClicked),[=](QAbstractButton * button){
            QRadioButton * radioButton = qobject_cast<QRadioButton *>(button);
            qDebug() << radioButton->isChecked() << radioButton->objectName();
        });

# 8、QComboBox（下拉框） #

setMinimumSize(600,500);
    
        QComboBox * comBox = new QComboBox(this);
    
        comBox->setGeometry(200,200,200,50);
        comBox->setIconSize(QSize(50,50));
    
    
        comBox->addItem(QIcon(":/resource/index_logo.png"),QString("test1"),QVariant("data1"));
        comBox->addItem(QIcon(":/resource/index_logo.png"),QString("test2"),QVariant("data2"));
        comBox->addItem(QIcon(":/resource/index_logo.png"),QString("test3"),QVariant("data3"));
    
        //处理信号与槽
        this->connect(comBox,QOverload<int>::of(&QComboBox::activated),[=](int index){
            qDebug() << index << comBox->itemText(index) << comBox->itemData(index);
        });

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 12][]

# 9、QSlider（滑块） #

setMinimumSize(600,500);
    
        QSlider * slider = new QSlider(this);
    
        slider->setRange(0,100);
        slider->setGeometry(200,200,200,50);
    
        slider->setOrientation(Qt::Horizontal);
    
        slider->setStyleSheet("QSlider:groove{"
                              "background-color:red;"
                              "}"
                              ""
                              "QSlider:handle{"
                              "background-color:blue;"
                              "width:6px;"
                              "}");
    
        this->connect(slider,&QSlider::sliderMoved,[=](int pos){
            qDebug() << pos;
        });

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 13][]

# 9、QListWidge #

## 9.1、基本操作 ##

setMinimumSize(600,500);
    
        QListWidget * listWidget = new QListWidget(this);
    
        listWidget->setGeometry(200,50,360,300);
    
        listWidget->setCurrentRow(10);
        listWidget->setSortingEnabled(false);
        listWidget->setIconSize(QSize(50,50));
        //设置Ctrl多选
        listWidget->setSelectionMode(QAbstractItemView::ExtendedSelection);
    
        for (int i=0;i<100;i++){
            QListWidgetItem * listWidgetItem = new QListWidgetItem(QIcon(":/resource/index_logo.png"),QString("item%1").arg(i+1),listWidget);
            listWidget->addItem(listWidgetItem);
        }
    
    
        //设置信号和槽
        this->connect(listWidget,&QListWidget::itemClicked,[=](QListWidgetItem *item){
            qDebug() << item->text();
        });

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 14][]

## 9.2、设置listWidget里的子项可编辑 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 15][]

## 9.3、遍历listWidget里的所有子项 ##

for (int i=0;i<listWidget->count();i++){
            QListWidgetItem * listWidgetItem = listWidget->item(i);
            qDebug() << listWidgetItem->text();
        }

## 9.4、对listWidget列表排序 ##

listWidget->sortItems(Qt::DescendingOrder);

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 16][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 17][]

## 9.5、在QListWidget上添加组件 ##

for (int i=0;i<100;i++){
            QListWidgetItem * listWidgetItem = new QListWidgetItem(QIcon(":/resource/index_logo.png"),QString("item%1").arg(i+1),listWidget);
            //设置listWidget里的子项可编辑
            listWidgetItem->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEditable | Qt::ItemIsEnabled);
            listWidget->addItem(listWidgetItem);
        }
    
        listWidget->sortItems(Qt::DescendingOrder);
    
        listWidget->sortItems(Qt::DescendingOrder);
        listWidget->setItemWidget(listWidget->item(0),new QPushButton(listWidget));

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 18][]

# 9、QListWidge #

## 9.1、设置滚动条策略 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 19][]

tableWidget->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
    tableWidget->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);

##  9.2、添加table ##

setMinimumSize(600,500);
    
        QTableWidget * tableWidget = new QTableWidget(this);
    
        tableWidget->setGeometry(200,100,300,300);
        tableWidget->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
        tableWidget->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
    
        tableWidget->setColumnCount(3);
    
        for (int i=0;i<3;i++){
            QTableWidgetItem * tableWidgetItem = new QTableWidgetItem(QString("column%1").arg(i+1));
            tableWidget->setHorizontalHeaderItem(i,tableWidgetItem);
        }
    
        tableWidget->setRowCount(100);
    
        for (int i=0;i<100;i++){
            for (int j=0;j<tableWidget->columnCount();j++){
                QTableWidgetItem * tableWidgetItem = new QTableWidgetItem(QString("column%1").arg(j+1));
                tableWidget->setItem(i,j,tableWidgetItem);
            }
        }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 20][]

##  9.3、在QTableWidget上添加组件 ##

QPushButton * pushButton = new QPushButton(tableWidget);
        pushButton->setMinimumSize(200,30);
        pushButton->setText("按钮组件");
    
        tableWidget->setColumnWidth(0,300);
    
        tableWidget->setCellWidget(0,0,pushButton);

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 21][]

## 9.4、设置行标 ##

QStringList * stringList = new QStringList();
    
        for (int i=0;i<100;i++){
            stringList->append(QString("row%1").arg(i+1));
        }
        
        tableWidget->setVerticalHeaderLabels(*stringList);

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d0bDE5OTI_size_16_color_FFFFFF_t_70 22][]

## 9.5、removeRow ##

tableWidget->removeRow(1);

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