Qt中控件的函数使用教程分享

//将编辑框中的内容转化成Utf8编码
ui->textEdit->toPlainText().toUtf8(); 

ui->comboBox->addItem(ui->recvMulAddrEdit->text());

 ui->comboBox->removeItem(ui->recvMulAddr->currentIndex()); 

void QPlayer::on_listWidget_doubleClicked(const QModelIndex &index)//双击进入
{
    //"mplayer -slave -quiet -geometry x:y -zoom -x x -y y move.mp4"
    //http://192.168.1.248/move.mp4
    QString movepath = path+ui->listWidget->currentItem()->text(); //ui->listWidget->currentItem()->text() 取出当前光标双击的一行内容
 
    QString cmd = QString("mplayer -slave -quiet -geometry %1:%2 -zoom -x %3 -y %4 %5")
            .arg(QString::number(ui->label->x()))
            .arg(QString::number(ui->label->y()))
            .arg(QString::number(ui->label->width()))
            .arg(QString::number(ui->label->height()))
            .arg(movepath);
 
    if(mProcess->state() == QProcess::Running)
    {
        mProcess->kill();
        mProcess->waitForFinished();
    }else
    {
        mProcess->start(cmd);
    }
 
}

int num = ui->listWidget->row(ui->listWidget->currentItem()); 

QListWidgetItem *item = new QListWidgetItem(QIcon(fileDir),info.fileName());
ui->ListWidget->addItem(item); //往List Wiget里面添加项

  Form *win = new Form(ui->listWidget); //这是一个子窗口，ui->listWidget把窗口对象放进ListWidget列表中
  QListWidgetItem *item = new QListWidgetItem();
  item->setSizeHint(win->size()); //每项的大小设置为win的大小
  ui->listWidget->addItem(item);
  ui->listWidget->setItemWidget(item,win); //

ui->label->setScaledContents(true);//显示图片的全部
ui->label->setPixmap(QPixmap(tempDir));//显示图片，tempDir是照片的绝对路径

QPixmap mmp;
mmp.load("E:/GZ17-3/system/Qt-program/001/code/LoginWin/tst.png"); 
mmp = mmp.scaled(ui->label->size());
ui->label->setPixmap(mmp);

void ProcessMplayer::on_listWidget_doubleClicked(const QModelIndex &index) //双击播放视频
{
    qDebug()<<ui->listWidget->currentItem()->text();
    QString cmd = "E:/GZ17-3/system/Qt-program/mplayer/mplayer.exe";
    //cmd.append(ui->listWidget->currentItem()->text());
 
    QStringList  argmList;
    argmList<<"-slave"; //从模式--通过命令控制
    argmList<<"-quiet"; //屏蔽解码信息输出
    argmList<<"-wid";//嵌入到界面上，后面接窗口ID
    argmList<<QString::number(ui->label->winId());
    argmList<<ui->listWidget->currentItem()->text();
 
    if(mProcess->state() == QProcess::Running)
    {
        mProcess->kill();
        mProcess->waitForFinished();
    }
    mProcess->start(cmd, argmList);
}

 QMovie *movie = new QMovie("../form/1.gif");  // "../form/1.gif"图片路径
 movie->start(); //开始播放动态图
 ui->label->setMovie(movie); //将图片设置为为动态
 ui->label->setScaledContents(true); //尽可能完整的播放整张动图 ，此处要设置为true

//截屏
QPixmap map = QApplication::screens().at(0)->grabWindow(0);
map.save("./screen.png"); //保存到当前目录下，名字为screen.png
QBuffer buffer; //图片暂时存储器
buffer.open(QIODevice::WriteOnly);
map.save(&buffer);
buffer.data();//得到QByteArray 对象可以转换为char*
 
//显示
map = map.scaled(ui->label->size()); //图片跟着屏幕的缩放
ui->label->setPixmap(map);

ui->checkBox->setCheckState(Qt::Unchecked); //把按钮重新置于没有被选中的状态

  //键盘数组
    QToolButton *buttons[12];
  //按钮初始化
    buttons[0] = ui->btn_value0;
    buttons[1] = ui->btn_value1;
    buttons[2] = ui->btn_value2;
    buttons[3] = ui->btn_value3;
    buttons[4] = ui->btn_value4;
    buttons[5] = ui->btn_value5;
    buttons[6] = ui->btn_value6;
    buttons[7] = ui->btn_value7;
    buttons[8] = ui->btn_value8;
    buttons[9] = ui->btn_value9;
    buttons[10] = ui->btn_Point;
    buttons[11] = ui->btn_delete;
 
 //所有按钮信号关联一个槽函数
    for(int i=0;i<12;i++)
    {
        connect(buttons[i],SIGNAL(clicked(bool)),this,SLOT(clicked_button()));
    }
    
//点击哪个按钮
void ArmInfo::clicked_button()
{
    //获取是哪个按钮点击(信号发送者)
    QToolButton *obj = (QToolButton*)sender();
    QString ip = ui->lineEdit_Amend->text();
    if(obj->text() == "<-") //检测是否点击删除按钮
    {
      ip.remove(ip.length()-1,1);//删除最后一个字符
    }
 
    else
    {
       ip.append(obj->text());//拼接字符串
    }
    ui->lineEdit_Amend->setText(ip);
}

ui->pushButton->setCheckable(true); //按一次就改变一次状态，比如说第一次按下时true那么第二次就是false
connect(ui->pushButton,SIGNAL(clicked(bool)),this,SLOT(check(bool)));

void MainWindow::on_pushButton_pressed() //按下按钮时
{
    ui->pushButton->setStyleSheet("border-image: url(:/new/prefix1/imag/人体炮弹.png);");
}
 
void MainWindow::on_pushButton_released() //释放按钮时
{
    ui->pushButton->setStyleSheet("border-image: url(:/new/prefix1/imag/atm.png);");
}

 //垂直布局管理器
 QVBoxLayout *vbox = new QVBoxLayout(this);
 lineEdit = new QLineEdit(this); //定义一个lineEdit对象
 lineEdit->setMinimumHeight(60); //设置最小高度
 lineEdit->setAlignment(Qt::AlignRight); //设置输入框中右边对齐 

//90为x轴，100为y轴，300为宽，400为高设置界面的大小
ui->toolButton->setGeometry(90,100,300,400); 

 //设置图标，../toolbar/icon.jpg 这是图片所在路径，要在源程序目录下
 ui->toolButton->setIcon(QIcon("../toolbar/icon.jpg"));

connect(ui->action_New,SIGNAL(triggered(bool)),this,SLOT(doProcessNew())); //action按钮的绑定方法，这里和pushButton不同的时候触发为triggered(bool)

MainWindow{border-image: url(:/new/prefix1/imag/00958PICfNK.jpg);}