QGroupBox添加QCheckBox和QLineEdit限制只能整数输入,QComboBox添加选项Item,QLineEdit密码形式.QWidget添加背景,

1.一个QGroupBox 中添加QCheckBox,控制这个QGroupBox是否可用,当check为true时QGroupBox可用,反之不可用.group里有个限制1000以内的整形数的QLineEdit和一个QLabel

	m_LineEditCustom = new QLineEdit;
	m_LineEditCustom->setValidator(new QIntValidator(1, 999, m_LineEditIterate));
	m_GroupCustom = new QGroupBox(QString("输入初始值"));
	m_GroupCustom->setCheckable(true);
	m_GroupCustom->setChecked(false);
	QHBoxLayout* hLayout = new QHBoxLayout;
	hLayout->addWidget(new QLabel("输入值:"));
	hLayout->addWidget(m_LineEditCustom);
	m_GroupCustom->setLayout(hLayout);
2.QComboBox添加选项Item

QStringList DrawTypeList;
DrawTypeList.clear();
DrawTypeList.push_back(QString("第一个"));
DrawTypeList.push_back(QString("第二个"));
DrawTypeList.push_back(QString("第三个"));
DrawTypeList.push_back(QString("第四个"));
DrawTypeList.push_back(QString("第五个"));
m_ComboBox->clear();
m_ComboBox->addItems(DrawTypeList);

3.QDialog桌面居中显示,this是QDialog类界面创建函数

QDesktopWidget *desktop = QApplication::desktop();
QRect deskRect = desktop->availableGeometry();
int x = (deskRect.width() - this->width())/2;
int y = (deskRect.height() - this->height())/2;
this->move(x, y);

this->setFixedSize(450, 200);
this->setAutoFillBackground(true);
this->setWindowModality(Qt::ApplicationModal);

4.QLineEdit显示密码形式

m_LineEditPWD->setEchoMode(QLineEdit::Password);
m_LineEditPWD->setStyleSheet("lineedit-password-character: 42");
5.QWidget添加背景图片

QPalette palette; 
palette.setBrush(this->backgroundRole(),QBrush(QImage(":/images/fmm.png")));
this->setPalette(palette);
this->setAutoFillBackground(true);
//添加登录框的logo.
this->setWindowIcon(QIcon(":/images/logo.png"));
6.QLabel设置QSS样式表

QLabel *nameLabel = new QLabel("账  户: ", layoutWidget);
nameLabel->setStyleSheet(QString::fromUtf8("QLabel{color:#ffffff}"));

7.让一个对话框总是在所有的窗口的最前面显示

this->setWindowFlags(Qt::WindowStaysOnTopHint);

8.修改QMessageBox按钮的显示的文本,使用addButton函数;

QPushButton * QMessageBox::addButton ( const QString & text, ButtonRole role )

QPushButton * a = mesBox.addButton("A", QMessageBox::YesRole);





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