QT学习笔记2（各种组件和四大布局）

我就是我 2022-12-24 11:55 457阅读 0赞

1、操作

新建一个项目：

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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：

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代码：

  1. //处理最大化按钮的事件
  2.     QPushButton * maxPushButton = new QPushButton(this);
  3.     maxPushButton->setText("最大化");
  4.     maxPushButton->setGeometry(100,100,80,30);
  5.     this->connect(maxPushButton,&QPushButton::clicked,[=](){
  6.        this->setWindowState(Qt::WindowMaximized);
  7.     });
  9.     //处理最小化按钮的事件
  10.     QPushButton * minPushButton = new QPushButton(this);
  11.     minPushButton->setText("最小化");
  12.     minPushButton->setGeometry(200,100,80,30);
  13.     this->connect(minPushButton,&QPushButton::clicked,[=](){
  14.        this->setWindowState(Qt::WindowMinimized);
  15.     });
  17.     //处理全屏按钮的事件
  18.     QPushButton * fullScreenPushButton = new QPushButton(this);
  19.     fullScreenPushButton->setText("全屏");
  20.     fullScreenPushButton->setGeometry(300,100,80,30);
  21.     this->connect(fullScreenPushButton,&QPushButton::clicked,[=](){
  22.        this->setWindowState(Qt::WindowFullScreen);
  23.     });

3、窗口无边框

使窗口无边框：

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代码：

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

4、QLabel的使用

4.1、显示文字

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

4.2、换行显示

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

4.3、设置样式：字体、字体颜色、背景

  1. setFixedSize(600,500);
  2.     QLabel * label = new QLabel(this);
  3.     label->setGeometry(200,200,100,60);
  5.     label->setText("我是label组件\ntest");
  6.     label->setStyleSheet(QString("background-color:#FF0000;"
  7.                                  "color:#FFFFFF;"));
  8.     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

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

4.4.2、用QPixmap显示图片

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

4.4.3、播放gif动画

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

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

  1. #include "mylabel.h"
  3. MyLabel::MyLabel(QWidget *parent) : QLabel(parent)
  4. {
  6. }
  8. void MyLabel::enterEvent(QEvent *event){
  9.     this->setStyleSheet("background-color:#00FFFF;");
  10. }
  12. void MyLabel::leaveEvent(QEvent *event){
  13.     this->setStyleSheet("background-color:#FF0000;");
  14. }
  16. setFixedSize(600,500);
  17.     MyLabel * label = new MyLabel(this);
  18.     label->setGeometry(0,0,600,500);
  20.     label->setText("我是label组件<br/>test<br/>"
  21.                    "<a href='https://www.baidu.com'>百度一下</a>");
  23.     label->setTextFormat(Qt::RichText);
  25.     label->setAlignment(Qt::AlignCenter);
  27.     label->setStyleSheet(QString("background-color:#FF0000;"
  28.                                  "color:#FFFFFF;"));

4.6、选择和编辑

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

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5、QPushButton的使用

5.1、事件设置

  1. setMinimumSize(600,500);
  2.     QPushButton * closePushButton = new QPushButton(this);
  4.     closePushButton->setGeometry(230,200,100,36);
  5.     closePushButton->setText("关闭窗口按钮");
  7.     this->connect(closePushButton,&QPushButton::clicked,[=](){
  8.         this->close();
  9.     });
  11.     QPushButton * maxPushButton = new QPushButton(this);
  12.     maxPushButton->setGeometry(340,200,100,36);
  13.     maxPushButton->setText("最大化窗口按钮");
  15.     this->connect(maxPushButton,&QPushButton::released,[=](){
  16.         this->setWindowState(Qt::WindowMaximized);
  17.     });

5.2、快捷键设置

  1. setMinimumSize(600,500);
  2.     QPushButton * closePushButton = new QPushButton(this);
  4.     closePushButton->setGeometry(230,200,100,36);
  5.     closePushButton->setText("关闭窗口按钮");
  7.     this->connect(closePushButton,&QPushButton::clicked,[=](){
  8.         this->close();
  9.     });
  11.     QPushButton * maxPushButton = new QPushButton(this);
  12.     maxPushButton->setGeometry(340,200,100,36);
  13.     maxPushButton->setText("最大化窗口按钮");
  15.     this->connect(maxPushButton,&QPushButton::released,[=](){
  16.         this->setWindowState(Qt::WindowMaximized);
  17.     });
  19.     maxPushButton->setShortcut(tr("Ctrl+E"));

5.3、样式设置

QPushButton:hover、QPushButton:!hover：

  1. setMinimumSize(600,500);
  2.     QPushButton * closePushButton = new QPushButton(this);
  4.     closePushButton->setGeometry(230,200,200,36);
  5.     closePushButton->setText("关闭窗口按钮");
  7.     closePushButton->setStyleSheet("QPushButton:hover{"
  8.                                    "background-color : #FF0000;"
  9.                                    "color:#00FFFF;"
  10.                                    "font-size:30px;"
  11.                                    "}"
  12.                                    ""
  13.                                    "QPushButton:!hover{"
  14.                                    "background-color : #FFFF00;"
  15.                                    "color:#0000FF;"
  16.                                    "font-size:20px;"
  17.                                    "}"
  18.                                    ""
  19.                                    "background-color:#FFFF00;"
  20.                                    "color:#0000FF;"
  21.                                    "font-size:20px;");

6、QLineEdit的使用

6.1、属性方法

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

20201129094414491.png

  1. setMinimumSize(600,500);
  2.     lineEdit = new QLineEdit(this);
  4.     lineEdit->setGeometry(230,200,200,50);
  6.     lineEdit->setPlaceholderText("请输入一行字符串");
  7.     lineEdit->setFont(QFont("微软雅黑",16));
  8.     lineEdit->setReadOnly(false);
  9.     lineEdit->setMaxLength(10);
  10.     lineEdit->setEchoMode(QLineEdit::Password);

6.2、信号事件

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

6.3、qss样式

  1. lineEdit->setStyleSheet("QLineEdit{"
  2.                             "border:2px solid red;"
  3.                             "border-radius:2px;"
  4.                             "}"
  5.                             ""
  6.                             "QLineEdit[echoMode='2']{"
  7.                             "background-color:#CCCCCC;"
  8.                             "}");

7、QObject的解读和布局类（Layout）

7.1、递归遍历子节点（children()）

  1. void Widget::listChildrens(QWidget * widget){
  2.     QObjectList objectList = widget->children();
  4.     for (int i=0;i<objectList.size();i++){
  5.         qDebug() << objectList[i]->objectName();
  6.         qDebug() << objectList[i]->metaObject()->className();
  8.         listChildrens(qobject_cast<QWidget *>(objectList[i]));
  9.     }
  10. }
  12. setMinimumSize(600,500);
  14.     QPushButton * pushButton = new QPushButton(this);
  15.     pushButton->setObjectName("pushButton");
  17.     QCheckBox * checkBox = new QCheckBox(this);
  18.     checkBox->setObjectName("checkBox");
  20.     QLabel * label = new QLabel(this);
  21.     label->setObjectName("label");
  23.     listChildrens(this);

7.2、Layout

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

  1. QVBoxLayout * vBoxLayout = new QVBoxLayout(layoutWidget);
  2. vBoxLayout->setContentsMargins(0,0,0,0);
  3. vBoxLayout->setSpacing(0);

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

  1. label->setMinimumSize(100,100);

7.2.1、QVBoxLayout

  1. setMinimumSize(600,500);
  3.     QWidget * layoutWidget = new QWidget(this);
  5.     layoutWidget->setGeometry(0,0,200,200);
  7.     layoutWidget->setStyleSheet("background-color: blue;");
  9.     QVBoxLayout * vBoxLayout = new QVBoxLayout(layoutWidget);
  10.     vBoxLayout->setContentsMargins(0,0,0,0);
  11.     vBoxLayout->setSpacing(0);
  14.     QPushButton * pushButton = new QPushButton(layoutWidget);
  15.     pushButton->setObjectName("pushButton");
  17.     pushButton->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Fixed);
  18.     pushButton->setStyleSheet("background-color:green;margin:-1px;");
  19.     QCheckBox * checkBox = new QCheckBox(layoutWidget);
  20.     checkBox->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Fixed);
  21.     checkBox->setObjectName("checkBox");
  23.     checkBox->setStyleSheet("background-color:red;margin:-1px;");
  25.     QLabel * label = new QLabel(layoutWidget);
  26.     label->setObjectName("label");
  28.     vBoxLayout->addWidget(pushButton);
  29.     vBoxLayout->addWidget(checkBox);
  30.     vBoxLayout->addWidget(label);

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7.2.2、QHBoxLayout

  1. setMinimumSize(600,500);
  3.     QWidget * layoutWidget = new QWidget(this);
  5.     layoutWidget->setGeometry(0,0,200,200);
  7.     layoutWidget->setStyleSheet("background-color: blue;");
  9.     QHBoxLayout * hBoxLayout = new QHBoxLayout(layoutWidget);
  10.     hBoxLayout->setContentsMargins(0,0,0,0);
  11.     hBoxLayout->setSpacing(0);
  13.     hBoxLayout->setAlignment(Qt::AlignLeft);
  16.     QPushButton * pushButton = new QPushButton(layoutWidget);
  17.     pushButton->setObjectName("pushButton");
  19.     pushButton->setSizePolicy(QSizePolicy::Fixed,QSizePolicy::Fixed);
  20.     pushButton->setStyleSheet("background-color:green;margin:-1px;");
  21.     QCheckBox * checkBox = new QCheckBox(layoutWidget);
  22.     checkBox->setSizePolicy(QSizePolicy::Fixed,QSizePolicy::Fixed);
  23.     checkBox->setObjectName("checkBox");
  25.     checkBox->setStyleSheet("background-color:red;margin:-1px;");
  27.     QLabel * label = new QLabel(layoutWidget);
  28.     label->setObjectName("label");
  30.     label->setSizePolicy(QSizePolicy::Fixed,QSizePolicy::Fixed);
  32.     label->setMinimumSize(100,100);
  34.     label->setStyleSheet("background-color:yellow;margin:-1px;");
  36.     hBoxLayout->addWidget(pushButton);
  37.     hBoxLayout->addWidget(checkBox);
  38.     hBoxLayout->addWidget(label);

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7.2.3、QGridLayout

  1. gridLayout->setContentsMargins(0,0,0,0);
  2. gridLayout->setVerticalSpacing(0);
  3. gridLayout->setHorizontalSpacing(0);
  5. gridLayout->setSpacing(0);
  7. setMinimumSize(600,500);
  9.     QWidget * layoutWidget = new QWidget(this);
  11.     layoutWidget->setGeometry(0,0,200,200);
  13.     layoutWidget->setStyleSheet("background-color: blue;");
  15.     QGridLayout * gridLayout = new QGridLayout(layoutWidget);
  17.     gridLayout->setContentsMargins(0,0,0,0);
  18.     gridLayout->setVerticalSpacing(0);
  19.     gridLayout->setHorizontalSpacing(0);
  21.     gridLayout->setSpacing(0);
  23.     QPushButton * pushButton1 = new QPushButton(layoutWidget);
  25.     pushButton1->setSizePolicy(QSizePolicy::Fixed,QSizePolicy::Fixed);
  26.     pushButton1->setMinimumSize(50,50);
  27.     pushButton1->setText("button1");
  29.     QPushButton * pushButton2 = new QPushButton(layoutWidget);
  31.     pushButton2->setMinimumSize(50,50);
  32.     pushButton2->setText("button2");
  34.     QPushButton * pushButton3 = new QPushButton(layoutWidget);
  36.     pushButton3->setMinimumSize(50,50);
  37.     pushButton3->setText("button3");
  39.     QPushButton * pushButton4 = new QPushButton(layoutWidget);
  41.     pushButton4->setMinimumSize(50,50);
  42.     pushButton4->setText("button4");
  44.     gridLayout->addWidget(pushButton1,0,0,Qt::AlignCenter);
  45.     gridLayout->addWidget(pushButton2,0,1,Qt::AlignCenter);
  46.     gridLayout->addWidget(pushButton3,0,2,Qt::AlignCenter);
  47.     gridLayout->addWidget(pushButton4,1,1,Qt::AlignCenter);

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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

  1. setMinimumSize(600,500);
  3.     QWidget * layoutWidget = new QWidget(this);
  5.     layoutWidget->setGeometry(0,0,200,200);
  7.     layoutWidget->setStyleSheet("background-color: blue;");
  9.     QFormLayout * formLayout = new QFormLayout(layoutWidget);
  11.     formLayout->setContentsMargins(0,0,0,0);
  12.     formLayout->setVerticalSpacing(0);
  13.     formLayout->setHorizontalSpacing(0);
  15.     formLayout->setSpacing(0);
  17.     QPushButton * pushButton1 = new QPushButton(layoutWidget);
  18.     pushButton1->setMinimumSize(50,50);
  19.     pushButton1->setText("button1");
  21.     QPushButton * pushButton2 = new QPushButton(layoutWidget);
  23.     pushButton2->setMinimumSize(50,50);
  24.     pushButton2->setText("button2");
  26.     QPushButton * pushButton3 = new QPushButton(layoutWidget);
  28.     pushButton3->setMinimumSize(50,50);
  29.     pushButton3->setText("button3");
  31.     QPushButton * pushButton4 = new QPushButton(layoutWidget);
  33.     pushButton4->setMinimumSize(50,50);
  34.     pushButton4->setText("button4");
  36.     formLayout->insertRow(0,pushButton1,pushButton2);
  37.     formLayout->insertRow(1,pushButton3,pushButton4);

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遍历QFormLayout：

  1. for (int i=0;i<formLayout->rowCount();i++){
  2.         QLayoutItem * labelLayoutItem = formLayout->itemAt(i,QFormLayout::LabelRole);
  3.         QLayoutItem * fieldLayoutItem = formLayout->itemAt(i,QFormLayout::FieldRole);
  5.         QPushButton * labelPushButton = qobject_cast<QPushButton *>(labelLayoutItem->widget());
  6.         QPushButton * fieldPushButton = qobject_cast<QPushButton *>(fieldLayoutItem->widget());
  8.        qDebug() << labelPushButton->metaObject()->className();
  9.        qDebug() << fieldPushButton->metaObject()->className();
  11.     }

8、QCheckBox、QRadioButton、QButtonGroup的使用

8.1、QCheckBox

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

8.2、QButtonGroup结合QCheckBox使用

  1. setMinimumSize(600,500);
  3.     QButtonGroup * buttonGroup = new QButtonGroup(this);
  5.     QCheckBox * checkBox1 = new QCheckBox(this);
  6.     checkBox1->setText("音乐");
  7.     checkBox1->setGeometry(100,100,100,30);
  9.     QCheckBox * checkBox2 = new QCheckBox(this);
  10.     checkBox2->setText("水果");
  11.     checkBox2->setGeometry(100,140,100,30);
  13.     QCheckBox * checkBox3 = new QCheckBox(this);
  14.     checkBox3->setText("蔬菜");
  15.     checkBox3->setGeometry(100,180,100,30);
  17.     buttonGroup->addButton(checkBox1);
  18.     buttonGroup->addButton(checkBox2);
  19.     buttonGroup->addButton(checkBox3);
  21.     //设置是否为单选  true:单选 false:多选
  22.     buttonGroup->setExclusive(true);

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8.3、QButtonGroup结合QRadioButton使用

  1. setMinimumSize(600,500);
  3.     QButtonGroup * buttonGroup = new QButtonGroup(this);
  5.     QRadioButton * radioButton1 = new QRadioButton(this);
  6.     radioButton1->setText("音乐");
  7.     radioButton1->setGeometry(100,100,100,30);
  9.     QRadioButton * radioButton2 = new QRadioButton(this);
  10.     radioButton2->setText("水果");
  11.     radioButton2->setGeometry(100,140,100,30);
  13.     QRadioButton * radioButton3 = new QRadioButton(this);
  14.     radioButton3->setText("蔬菜");
  15.     radioButton3->setGeometry(100,180,100,30);
  17.     buttonGroup->addButton(radioButton1);
  18.     buttonGroup->addButton(radioButton2);
  19.     buttonGroup->addButton(radioButton3);
  21.     radioButton2->setChecked(true);
  23.     //设置是否为单选  true:单选 false:多选
  24.     buttonGroup->setExclusive(true);

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信号处理：

  1. setMinimumSize(600,500);
  3.     QButtonGroup * buttonGroup = new QButtonGroup(this);
  5.     QRadioButton * radioButton1 = new QRadioButton(this);
  6.     radioButton1->setObjectName("radioButton1");
  7.     radioButton1->setText("音乐");
  8.     radioButton1->setGeometry(100,100,100,30);
  10.     QRadioButton * radioButton2 = new QRadioButton(this);
  11.     radioButton2->setObjectName("radioButton2");
  12.     radioButton2->setText("水果");
  13.     radioButton2->setGeometry(100,140,100,30);
  15.     QRadioButton * radioButton3 = new QRadioButton(this);
  16.     radioButton3->setObjectName("radioButton3");
  17.     radioButton3->setText("蔬菜");
  18.     radioButton3->setGeometry(100,180,100,30);
  20.     buttonGroup->addButton(radioButton1,1);
  21.     buttonGroup->addButton(radioButton2,2);
  22.     buttonGroup->addButton(radioButton3,3);
  24.     radioButton2->setChecked(true);
  26.     //设置是否为单选  true:单选 false:多选
  27.     buttonGroup->setExclusive(true);
  29.     this->connect(buttonGroup,QOverload<QAbstractButton *>::of(&QButtonGroup::buttonClicked),[=](QAbstractButton * button){
  30.         QRadioButton * radioButton = qobject_cast<QRadioButton *>(button);
  31.         qDebug() << radioButton->isChecked() << radioButton->objectName();
  32.     });

8、QComboBox（下拉框）

  1. setMinimumSize(600,500);
  3.     QComboBox * comBox = new QComboBox(this);
  5.     comBox->setGeometry(200,200,200,50);
  6.     comBox->setIconSize(QSize(50,50));
  9.     comBox->addItem(QIcon(":/resource/index_logo.png"),QString("test1"),QVariant("data1"));
  10.     comBox->addItem(QIcon(":/resource/index_logo.png"),QString("test2"),QVariant("data2"));
  11.     comBox->addItem(QIcon(":/resource/index_logo.png"),QString("test3"),QVariant("data3"));
  13.     //处理信号与槽
  14.     this->connect(comBox,QOverload<int>::of(&QComboBox::activated),[=](int index){
  15.         qDebug() << index << comBox->itemText(index) << comBox->itemData(index);
  16.     });

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9、QSlider（滑块）

  1. setMinimumSize(600,500);
  3.     QSlider * slider = new QSlider(this);
  5.     slider->setRange(0,100);
  6.     slider->setGeometry(200,200,200,50);
  8.     slider->setOrientation(Qt::Horizontal);
  10.     slider->setStyleSheet("QSlider:groove{"
  11.                           "background-color:red;"
  12.                           "}"
  13.                           ""
  14.                           "QSlider:handle{"
  15.                           "background-color:blue;"
  16.                           "width:6px;"
  17.                           "}");
  19.     this->connect(slider,&QSlider::sliderMoved,[=](int pos){
  20.         qDebug() << pos;
  21.     });

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9、QListWidge

9.1、基本操作

  1. setMinimumSize(600,500);
  3.     QListWidget * listWidget = new QListWidget(this);
  5.     listWidget->setGeometry(200,50,360,300);
  7.     listWidget->setCurrentRow(10);
  8.     listWidget->setSortingEnabled(false);
  9.     listWidget->setIconSize(QSize(50,50));
  10.     //设置Ctrl多选
  11.     listWidget->setSelectionMode(QAbstractItemView::ExtendedSelection);
  13.     for (int i=0;i<100;i++){
  14.         QListWidgetItem * listWidgetItem = new QListWidgetItem(QIcon(":/resource/index_logo.png"),QString("item%1").arg(i+1),listWidget);
  15.         listWidget->addItem(listWidgetItem);
  16.     }
  19.     //设置信号和槽
  20.     this->connect(listWidget,&QListWidget::itemClicked,[=](QListWidgetItem *item){
  21.         qDebug() << item->text();
  22.     });

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9.2、设置listWidget里的子项可编辑

  1. for (int i=0;i<100;i++){
  2.         QListWidgetItem * listWidgetItem = new QListWidgetItem(QIcon(":/resource/index_logo.png"),QString("item%1").arg(i+1),listWidget);
  3.         //设置listWidget里的子项可编辑
  4.         listWidgetItem->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEditable | Qt::ItemIsEnabled);
  5.         listWidget->addItem(listWidgetItem);
  6.     }

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9.3、遍历listWidget里的所有子项

  1. for (int i=0;i<listWidget->count();i++){
  2.         QListWidgetItem * listWidgetItem = listWidget->item(i);
  3.         qDebug() << listWidgetItem->text();
  4.     }

9.4、对listWidget列表排序

  1. listWidget->sortItems(Qt::DescendingOrder);

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9.5、在QListWidget上添加组件

  1. for (int i=0;i<100;i++){
  2.         QListWidgetItem * listWidgetItem = new QListWidgetItem(QIcon(":/resource/index_logo.png"),QString("item%1").arg(i+1),listWidget);
  3.         //设置listWidget里的子项可编辑
  4.         listWidgetItem->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEditable | Qt::ItemIsEnabled);
  5.         listWidget->addItem(listWidgetItem);
  6.     }
  8.     listWidget->sortItems(Qt::DescendingOrder);
  10.     listWidget->sortItems(Qt::DescendingOrder);
  11.     listWidget->setItemWidget(listWidget->item(0),new QPushButton(listWidget));

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9、QListWidge

9.1、设置滚动条策略

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  1. tableWidget->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
  2. tableWidget->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);

9.2、添加table

  1. setMinimumSize(600,500);
  3.     QTableWidget * tableWidget = new QTableWidget(this);
  5.     tableWidget->setGeometry(200,100,300,300);
  6.     tableWidget->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
  7.     tableWidget->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
  9.     tableWidget->setColumnCount(3);
  11.     for (int i=0;i<3;i++){
  12.         QTableWidgetItem * tableWidgetItem = new QTableWidgetItem(QString("column%1").arg(i+1));
  13.         tableWidget->setHorizontalHeaderItem(i,tableWidgetItem);
  14.     }
  16.     tableWidget->setRowCount(100);
  18.     for (int i=0;i<100;i++){
  19.         for (int j=0;j<tableWidget->columnCount();j++){
  20.             QTableWidgetItem * tableWidgetItem = new QTableWidgetItem(QString("column%1").arg(j+1));
  21.             tableWidget->setItem(i,j,tableWidgetItem);
  22.         }
  23.     }

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9.3、在QTableWidget上添加组件

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

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9.4、设置行标

  1. QStringList * stringList = new QStringList();
  3.     for (int i=0;i<100;i++){
  4.         stringList->append(QString("row%1").arg(i+1));
  5.     }
  7.     tableWidget->setVerticalHeaderLabels(*stringList);

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9.5、removeRow

  1. tableWidget->removeRow(1);

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