基于Qt的车载GPS监控系统（3）界面设计

界面框架

Qt程序主界面

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QTextCodec *codec = QTextCodec::codecForName("GB2312");
    QTextCodec::setCodecForTr(codec);
    QTextCodec::setCodecForLocale(codec);
    QTextCodec::setCodecForCStrings(codec);

    SysDialog *win = new SysDialog();
    win->show();//显示主界面
    return app.exec();
}

界面代码分析
主界面背景实现代码

SysDialog::SysDialog( QWidget *parent): QDialog( parent)
{
    ...
    this->setMinimumSize(800,480);
    this->setMaximumSize(800,480);
    this->setWindowIcon(QPixmap( ":/images/1.png") );
    this->setWindowTitle(tr("GP9001车载GPS监控系统"));
    label_pic_bg = new QLabel(this);
    label_pic_bg->setGeometry(QRect(0, 0, 800, 480));
    label_pic_bg->setPixmap(QPixmap(":/images/gp9001bg.jpg"));
    label_pic_bg->setScaledContents(true);

子功能按钮实现

    toolButtonState = new QToolButton(this);
    toolButtonState->setGeometry(QRect(20, 320, 100, 100));
    toolButtonState->setText( tr( "系统状态" ) );
    toolButtonState->setIcon( QPixmap( ":/images/car.png") );
    toolButtonState->setIconSize( QPixmap( ":/images/car.png").size() );
    toolButtonState->setAutoRaise( TRUE );
    toolButtonState->setToolButtonStyle( Qt::ToolButtonTextUnderIcon);
    connect(toolButtonState,SIGNAL(clicked()),this,SLOT(goCmdState()));

对应的槽函数

void SysDialog::goCmdState()
{
    ShowDialog *myDlg = new ShowDialog(this);
    if(myDlg->exec()){
        qDebug() << 1;
    }else{
        qDebug() << 2;
    }
    delete myDlg;
}

界面设计技术点说明

1.控件采用绝对坐标进行布局

    label_pic_bg->setGeometry(QRect(30, 80, 800, 480));
　　//x=30,y=80,width=800,height=480

2.dialog背景如何设置为图片

    label_pic_bg = new QLabel(this);
    label_pic_bg->setGeometry(QRect(0, 0, 800, 480));
    label_pic_bg->setPixmap(QPixmap(":/images/9bg.jpg"));
    label_pic_bg->setScaledContents(true);

3.窗口之间如何进行调用
例如在窗口A中通过单击按钮启动窗口B
a)调用者A
调用A设置slot,new一个B窗口，使用exec()方法启动B窗口。

connect(toolButtonState,SIGNAL(clicked()),this,SLOT(goCmdState()));

void SysDialog::goCmdState()
{
    SetDialog *loginDlg = new SetDialog(this);
    if(loginDlg->exec()){
        qDebug() << 1;
    }else{
        qDebug() << 2;
    }
    delete loginDlg;
}

b)被调用者B

调用窗口按钮单击后能关闭窗口

	connect(toolButton,SIGNAL(clicked()),this,SLOT(accept()));

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